1 /*
2  * Copyright © 1997-2003 by The XFree86 Project, Inc.
3  * Copyright © 2007 Dave Airlie
4  * Copyright © 2007-2008 Intel Corporation
5  *   Jesse Barnes <jesse.barnes@intel.com>
6  * Copyright 2005-2006 Luc Verhaegen
7  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included in
17  * all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25  * OTHER DEALINGS IN THE SOFTWARE.
26  *
27  * Except as contained in this notice, the name of the copyright holder(s)
28  * and author(s) shall not be used in advertising or otherwise to promote
29  * the sale, use or other dealings in this Software without prior written
30  * authorization from the copyright holder(s) and author(s).
31  */
32 
33 #include <linux/ctype.h>
34 #include <linux/export.h>
35 #include <linux/fb.h> /* for KHZ2PICOS() */
36 #include <linux/list.h>
37 #include <linux/list_sort.h>
38 #include <linux/of.h>
39 
40 #include <video/of_display_timing.h>
41 #include <video/of_videomode.h>
42 #include <video/videomode.h>
43 
44 #include <drm/drm_crtc.h>
45 #include <drm/drm_device.h>
46 #include <drm/drm_edid.h>
47 #include <drm/drm_modes.h>
48 #include <drm/drm_print.h>
49 
50 #include "drm_crtc_internal.h"
51 
52 /**
53  * drm_mode_debug_printmodeline - print a mode to dmesg
54  * @mode: mode to print
55  *
56  * Describe @mode using DRM_DEBUG.
57  */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)58 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
59 {
60 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
61 }
62 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
63 
64 /**
65  * drm_mode_create - create a new display mode
66  * @dev: DRM device
67  *
68  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
69  * and return it.
70  *
71  * Returns:
72  * Pointer to new mode on success, NULL on error.
73  */
drm_mode_create(struct drm_device * dev)74 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
75 {
76 	struct drm_display_mode *nmode;
77 
78 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
79 	if (!nmode)
80 		return NULL;
81 
82 	return nmode;
83 }
84 EXPORT_SYMBOL(drm_mode_create);
85 
86 /**
87  * drm_mode_destroy - remove a mode
88  * @dev: DRM device
89  * @mode: mode to remove
90  *
91  * Release @mode's unique ID, then free it @mode structure itself using kfree.
92  */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)93 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
94 {
95 	if (!mode)
96 		return;
97 
98 	kfree(mode);
99 }
100 EXPORT_SYMBOL(drm_mode_destroy);
101 
102 /**
103  * drm_mode_probed_add - add a mode to a connector's probed_mode list
104  * @connector: connector the new mode
105  * @mode: mode data
106  *
107  * Add @mode to @connector's probed_mode list for later use. This list should
108  * then in a second step get filtered and all the modes actually supported by
109  * the hardware moved to the @connector's modes list.
110  */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)111 void drm_mode_probed_add(struct drm_connector *connector,
112 			 struct drm_display_mode *mode)
113 {
114 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
115 
116 	list_add_tail(&mode->head, &connector->probed_modes);
117 }
118 EXPORT_SYMBOL(drm_mode_probed_add);
119 
120 enum drm_mode_analog {
121 	DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
122 	DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
123 };
124 
125 /*
126  * The timings come from:
127  * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
128  * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
129  * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
130  */
131 #define NTSC_LINE_DURATION_NS		63556U
132 #define NTSC_LINES_NUMBER		525
133 
134 #define NTSC_HBLK_DURATION_TYP_NS	10900U
135 #define NTSC_HBLK_DURATION_MIN_NS	(NTSC_HBLK_DURATION_TYP_NS - 200)
136 #define NTSC_HBLK_DURATION_MAX_NS	(NTSC_HBLK_DURATION_TYP_NS + 200)
137 
138 #define NTSC_HACT_DURATION_TYP_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
139 #define NTSC_HACT_DURATION_MIN_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
140 #define NTSC_HACT_DURATION_MAX_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
141 
142 #define NTSC_HFP_DURATION_TYP_NS	1500
143 #define NTSC_HFP_DURATION_MIN_NS	1270
144 #define NTSC_HFP_DURATION_MAX_NS	2220
145 
146 #define NTSC_HSLEN_DURATION_TYP_NS	4700
147 #define NTSC_HSLEN_DURATION_MIN_NS	(NTSC_HSLEN_DURATION_TYP_NS - 100)
148 #define NTSC_HSLEN_DURATION_MAX_NS	(NTSC_HSLEN_DURATION_TYP_NS + 100)
149 
150 #define NTSC_HBP_DURATION_TYP_NS	4700
151 
152 /*
153  * I couldn't find the actual tolerance for the back porch, so let's
154  * just reuse the sync length ones.
155  */
156 #define NTSC_HBP_DURATION_MIN_NS	(NTSC_HBP_DURATION_TYP_NS - 100)
157 #define NTSC_HBP_DURATION_MAX_NS	(NTSC_HBP_DURATION_TYP_NS + 100)
158 
159 #define PAL_LINE_DURATION_NS		64000U
160 #define PAL_LINES_NUMBER		625
161 
162 #define PAL_HACT_DURATION_TYP_NS	51950U
163 #define PAL_HACT_DURATION_MIN_NS	(PAL_HACT_DURATION_TYP_NS - 100)
164 #define PAL_HACT_DURATION_MAX_NS	(PAL_HACT_DURATION_TYP_NS + 400)
165 
166 #define PAL_HBLK_DURATION_TYP_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
167 #define PAL_HBLK_DURATION_MIN_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
168 #define PAL_HBLK_DURATION_MAX_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
169 
170 #define PAL_HFP_DURATION_TYP_NS		1650
171 #define PAL_HFP_DURATION_MIN_NS		(PAL_HFP_DURATION_TYP_NS - 100)
172 #define PAL_HFP_DURATION_MAX_NS		(PAL_HFP_DURATION_TYP_NS + 400)
173 
174 #define PAL_HSLEN_DURATION_TYP_NS	4700
175 #define PAL_HSLEN_DURATION_MIN_NS	(PAL_HSLEN_DURATION_TYP_NS - 200)
176 #define PAL_HSLEN_DURATION_MAX_NS	(PAL_HSLEN_DURATION_TYP_NS + 200)
177 
178 #define PAL_HBP_DURATION_TYP_NS		5700
179 #define PAL_HBP_DURATION_MIN_NS		(PAL_HBP_DURATION_TYP_NS - 200)
180 #define PAL_HBP_DURATION_MAX_NS		(PAL_HBP_DURATION_TYP_NS + 200)
181 
182 struct analog_param_field {
183 	unsigned int even, odd;
184 };
185 
186 #define PARAM_FIELD(_odd, _even)		\
187 	{ .even = _even, .odd = _odd }
188 
189 struct analog_param_range {
190 	unsigned int	min, typ, max;
191 };
192 
193 #define PARAM_RANGE(_min, _typ, _max)		\
194 	{ .min = _min, .typ = _typ, .max = _max }
195 
196 struct analog_parameters {
197 	unsigned int			num_lines;
198 	unsigned int			line_duration_ns;
199 
200 	struct analog_param_range	hact_ns;
201 	struct analog_param_range	hfp_ns;
202 	struct analog_param_range	hslen_ns;
203 	struct analog_param_range	hbp_ns;
204 	struct analog_param_range	hblk_ns;
205 
206 	unsigned int			bt601_hfp;
207 
208 	struct analog_param_field	vfp_lines;
209 	struct analog_param_field	vslen_lines;
210 	struct analog_param_field	vbp_lines;
211 };
212 
213 #define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp,	\
214 			  _hslen, _hbp, _hblk, _bt601_hfp, _vfp,	\
215 			  _vslen, _vbp)					\
216 	[_mode] = {							\
217 		.num_lines = _lines,					\
218 		.line_duration_ns = _line_dur,				\
219 		.hact_ns = _hact,					\
220 		.hfp_ns = _hfp,						\
221 		.hslen_ns = _hslen,					\
222 		.hbp_ns = _hbp,						\
223 		.hblk_ns = _hblk,					\
224 		.bt601_hfp = _bt601_hfp,				\
225 		.vfp_lines = _vfp,					\
226 		.vslen_lines = _vslen,					\
227 		.vbp_lines = _vbp,					\
228 	}
229 
230 static const struct analog_parameters tv_modes_parameters[] = {
231 	TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
232 			  NTSC_LINES_NUMBER,
233 			  NTSC_LINE_DURATION_NS,
234 			  PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
235 				      NTSC_HACT_DURATION_TYP_NS,
236 				      NTSC_HACT_DURATION_MAX_NS),
237 			  PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
238 				      NTSC_HFP_DURATION_TYP_NS,
239 				      NTSC_HFP_DURATION_MAX_NS),
240 			  PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
241 				      NTSC_HSLEN_DURATION_TYP_NS,
242 				      NTSC_HSLEN_DURATION_MAX_NS),
243 			  PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
244 				      NTSC_HBP_DURATION_TYP_NS,
245 				      NTSC_HBP_DURATION_MAX_NS),
246 			  PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
247 				      NTSC_HBLK_DURATION_TYP_NS,
248 				      NTSC_HBLK_DURATION_MAX_NS),
249 			  16,
250 			  PARAM_FIELD(3, 3),
251 			  PARAM_FIELD(3, 3),
252 			  PARAM_FIELD(16, 17)),
253 	TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
254 			  PAL_LINES_NUMBER,
255 			  PAL_LINE_DURATION_NS,
256 			  PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
257 				      PAL_HACT_DURATION_TYP_NS,
258 				      PAL_HACT_DURATION_MAX_NS),
259 			  PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
260 				      PAL_HFP_DURATION_TYP_NS,
261 				      PAL_HFP_DURATION_MAX_NS),
262 			  PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
263 				      PAL_HSLEN_DURATION_TYP_NS,
264 				      PAL_HSLEN_DURATION_MAX_NS),
265 			  PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
266 				      PAL_HBP_DURATION_TYP_NS,
267 				      PAL_HBP_DURATION_MAX_NS),
268 			  PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
269 				      PAL_HBLK_DURATION_TYP_NS,
270 				      PAL_HBLK_DURATION_MAX_NS),
271 			  12,
272 
273 			  /*
274 			   * The front porch is actually 6 short sync
275 			   * pulses for the even field, and 5 for the
276 			   * odd field. Each sync takes half a life so
277 			   * the odd field front porch is shorter by
278 			   * half a line.
279 			   *
280 			   * In progressive, we're supposed to use 6
281 			   * pulses, so we're fine there
282 			   */
283 			  PARAM_FIELD(3, 2),
284 
285 			  /*
286 			   * The vsync length is 5 long sync pulses,
287 			   * each field taking half a line. We're
288 			   * shorter for both fields by half a line.
289 			   *
290 			   * In progressive, we're supposed to use 5
291 			   * pulses, so we're off by half
292 			   * a line.
293 			   *
294 			   * In interlace, we're now off by half a line
295 			   * for the even field and one line for the odd
296 			   * field.
297 			   */
298 			  PARAM_FIELD(3, 3),
299 
300 			  /*
301 			   * The back porch starts with post-equalizing
302 			   * pulses, consisting in 5 short sync pulses
303 			   * for the even field, 4 for the odd field. In
304 			   * progressive, it's 5 short syncs.
305 			   *
306 			   * In progressive, we thus have 2.5 lines,
307 			   * plus the 0.5 line we were missing
308 			   * previously, so we should use 3 lines.
309 			   *
310 			   * In interlace, the even field is in the
311 			   * exact same case than progressive. For the
312 			   * odd field, we should be using 2 lines but
313 			   * we're one line short, so we'll make up for
314 			   * it here by using 3.
315 			   *
316 			   * The entire blanking area is supposed to
317 			   * take 25 lines, so we also need to account
318 			   * for the rest of the blanking area that
319 			   * can't be in either the front porch or sync
320 			   * period.
321 			   */
322 			  PARAM_FIELD(19, 20)),
323 };
324 
fill_analog_mode(struct drm_device * dev,struct drm_display_mode * mode,const struct analog_parameters * params,unsigned long pixel_clock_hz,unsigned int hactive,unsigned int vactive,bool interlace)325 static int fill_analog_mode(struct drm_device *dev,
326 			    struct drm_display_mode *mode,
327 			    const struct analog_parameters *params,
328 			    unsigned long pixel_clock_hz,
329 			    unsigned int hactive,
330 			    unsigned int vactive,
331 			    bool interlace)
332 {
333 	unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
334 	unsigned int htotal, vtotal;
335 	unsigned int max_hact, hact_duration_ns;
336 	unsigned int hblk, hblk_duration_ns;
337 	unsigned int hfp, hfp_duration_ns;
338 	unsigned int hslen, hslen_duration_ns;
339 	unsigned int hbp, hbp_duration_ns;
340 	unsigned int porches, porches_duration_ns;
341 	unsigned int vfp, vfp_min;
342 	unsigned int vbp, vbp_min;
343 	unsigned int vslen;
344 	bool bt601 = false;
345 	int porches_rem;
346 	u64 result;
347 
348 	drm_dbg_kms(dev,
349 		    "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
350 		    hactive, vactive,
351 		    interlace ? 'i' : 'p',
352 		    params->num_lines,
353 		    pixel_clock_hz / 1000);
354 
355 	max_hact = params->hact_ns.max / pixel_duration_ns;
356 	if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
357 		drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
358 		bt601 = true;
359 	}
360 
361 	/*
362 	 * Our pixel duration is going to be round down by the division,
363 	 * so rounding up is probably going to introduce even more
364 	 * deviation.
365 	 */
366 	result = (u64)params->line_duration_ns * pixel_clock_hz;
367 	do_div(result, NSEC_PER_SEC);
368 	htotal = result;
369 
370 	drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
371 
372 	hact_duration_ns = hactive * pixel_duration_ns;
373 	if (!bt601 &&
374 	    (hact_duration_ns < params->hact_ns.min ||
375 	     hact_duration_ns > params->hact_ns.max)) {
376 		DRM_ERROR("Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
377 			  hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
378 		return -EINVAL;
379 	}
380 
381 	hblk = htotal - hactive;
382 	drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
383 
384 	hblk_duration_ns = hblk * pixel_duration_ns;
385 	if (!bt601 &&
386 	    (hblk_duration_ns < params->hblk_ns.min ||
387 	     hblk_duration_ns > params->hblk_ns.max)) {
388 		DRM_ERROR("Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
389 			  hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
390 		return -EINVAL;
391 	}
392 
393 	hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
394 	drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
395 
396 	hslen_duration_ns = hslen * pixel_duration_ns;
397 	if (!bt601 &&
398 	    (hslen_duration_ns < params->hslen_ns.min ||
399 	     hslen_duration_ns > params->hslen_ns.max)) {
400 		DRM_ERROR("Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
401 			  hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
402 		return -EINVAL;
403 	}
404 
405 	porches = hblk - hslen;
406 	drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
407 
408 	porches_duration_ns = porches * pixel_duration_ns;
409 	if (!bt601 &&
410 	    (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
411 	     porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
412 		DRM_ERROR("Invalid horizontal porches duration: %uns\n", porches_duration_ns);
413 		return -EINVAL;
414 	}
415 
416 	if (bt601) {
417 		hfp = params->bt601_hfp;
418 	} else {
419 		unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
420 						    pixel_duration_ns);
421 		unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
422 						    pixel_duration_ns);
423 		int porches_rem = porches - hfp_min - hbp_min;
424 
425 		hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
426 	}
427 
428 	drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
429 
430 	hfp_duration_ns = hfp * pixel_duration_ns;
431 	if (!bt601 &&
432 	    (hfp_duration_ns < params->hfp_ns.min ||
433 	     hfp_duration_ns > params->hfp_ns.max)) {
434 		DRM_ERROR("Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
435 			  hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
436 		return -EINVAL;
437 	}
438 
439 	hbp = porches - hfp;
440 	drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
441 
442 	hbp_duration_ns = hbp * pixel_duration_ns;
443 	if (!bt601 &&
444 	    (hbp_duration_ns < params->hbp_ns.min ||
445 	     hbp_duration_ns > params->hbp_ns.max)) {
446 		DRM_ERROR("Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
447 			  hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
448 		return -EINVAL;
449 	}
450 
451 	if (htotal != (hactive + hfp + hslen + hbp))
452 		return -EINVAL;
453 
454 	mode->clock = pixel_clock_hz / 1000;
455 	mode->hdisplay = hactive;
456 	mode->hsync_start = mode->hdisplay + hfp;
457 	mode->hsync_end = mode->hsync_start + hslen;
458 	mode->htotal = mode->hsync_end + hbp;
459 
460 	if (interlace) {
461 		vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
462 		vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
463 		vslen = params->vslen_lines.even + params->vslen_lines.odd;
464 	} else {
465 		/*
466 		 * By convention, NTSC (aka 525/60) systems start with
467 		 * the even field, but PAL (aka 625/50) systems start
468 		 * with the odd one.
469 		 *
470 		 * PAL systems also have asymmetric timings between the
471 		 * even and odd field, while NTSC is symmetric.
472 		 *
473 		 * Moreover, if we want to create a progressive mode for
474 		 * PAL, we need to use the odd field timings.
475 		 *
476 		 * Since odd == even for NTSC, we can just use the odd
477 		 * one all the time to simplify the code a bit.
478 		 */
479 		vfp_min = params->vfp_lines.odd;
480 		vbp_min = params->vbp_lines.odd;
481 		vslen = params->vslen_lines.odd;
482 	}
483 
484 	drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
485 
486 	porches = params->num_lines - vactive - vslen;
487 	drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
488 
489 	porches_rem = porches - vfp_min - vbp_min;
490 	vfp = vfp_min + (porches_rem / 2);
491 	drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
492 
493 	vbp = porches - vfp;
494 	drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
495 
496 	vtotal = vactive + vfp + vslen + vbp;
497 	if (params->num_lines != vtotal) {
498 		DRM_ERROR("Invalid vertical total: %upx (expected %upx)\n",
499 			  vtotal, params->num_lines);
500 		return -EINVAL;
501 	}
502 
503 	mode->vdisplay = vactive;
504 	mode->vsync_start = mode->vdisplay + vfp;
505 	mode->vsync_end = mode->vsync_start + vslen;
506 	mode->vtotal = mode->vsync_end + vbp;
507 
508 	if (mode->vtotal != params->num_lines)
509 		return -EINVAL;
510 
511 	mode->type = DRM_MODE_TYPE_DRIVER;
512 	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
513 	if (interlace)
514 		mode->flags |= DRM_MODE_FLAG_INTERLACE;
515 
516 	drm_mode_set_name(mode);
517 
518 	drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
519 
520 	return 0;
521 }
522 
523 /**
524  * drm_analog_tv_mode - create a display mode for an analog TV
525  * @dev: drm device
526  * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
527  * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
528  * @hdisplay: hdisplay size
529  * @vdisplay: vdisplay size
530  * @interlace: whether to compute an interlaced mode
531  *
532  * This function creates a struct drm_display_mode instance suited for
533  * an analog TV output, for one of the usual analog TV mode.
534  *
535  * Note that @hdisplay is larger than the usual constraints for the PAL
536  * and NTSC timings, and we'll choose to ignore most timings constraints
537  * to reach those resolutions.
538  *
539  * Returns:
540  *
541  * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
542  * on error.
543  */
drm_analog_tv_mode(struct drm_device * dev,enum drm_connector_tv_mode tv_mode,unsigned long pixel_clock_hz,unsigned int hdisplay,unsigned int vdisplay,bool interlace)544 struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
545 					    enum drm_connector_tv_mode tv_mode,
546 					    unsigned long pixel_clock_hz,
547 					    unsigned int hdisplay,
548 					    unsigned int vdisplay,
549 					    bool interlace)
550 {
551 	struct drm_display_mode *mode;
552 	enum drm_mode_analog analog;
553 	int ret;
554 
555 	switch (tv_mode) {
556 	case DRM_MODE_TV_MODE_NTSC:
557 		fallthrough;
558 	case DRM_MODE_TV_MODE_NTSC_443:
559 		fallthrough;
560 	case DRM_MODE_TV_MODE_NTSC_J:
561 		fallthrough;
562 	case DRM_MODE_TV_MODE_PAL_M:
563 		analog = DRM_MODE_ANALOG_NTSC;
564 		break;
565 
566 	case DRM_MODE_TV_MODE_PAL:
567 		fallthrough;
568 	case DRM_MODE_TV_MODE_PAL_N:
569 		fallthrough;
570 	case DRM_MODE_TV_MODE_SECAM:
571 		analog = DRM_MODE_ANALOG_PAL;
572 		break;
573 
574 	default:
575 		return NULL;
576 	}
577 
578 	mode = drm_mode_create(dev);
579 	if (!mode)
580 		return NULL;
581 
582 	ret = fill_analog_mode(dev, mode,
583 			       &tv_modes_parameters[analog],
584 			       pixel_clock_hz, hdisplay, vdisplay, interlace);
585 	if (ret)
586 		goto err_free_mode;
587 
588 	return mode;
589 
590 err_free_mode:
591 	drm_mode_destroy(dev, mode);
592 	return NULL;
593 }
594 EXPORT_SYMBOL(drm_analog_tv_mode);
595 
596 /**
597  * drm_cvt_mode -create a modeline based on the CVT algorithm
598  * @dev: drm device
599  * @hdisplay: hdisplay size
600  * @vdisplay: vdisplay size
601  * @vrefresh: vrefresh rate
602  * @reduced: whether to use reduced blanking
603  * @interlaced: whether to compute an interlaced mode
604  * @margins: whether to add margins (borders)
605  *
606  * This function is called to generate the modeline based on CVT algorithm
607  * according to the hdisplay, vdisplay, vrefresh.
608  * It is based from the VESA(TM) Coordinated Video Timing Generator by
609  * Graham Loveridge April 9, 2003 available at
610  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
611  *
612  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
613  * What I have done is to translate it by using integer calculation.
614  *
615  * Returns:
616  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
617  * The display mode object is allocated with drm_mode_create(). Returns NULL
618  * when no mode could be allocated.
619  */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)620 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
621 				      int vdisplay, int vrefresh,
622 				      bool reduced, bool interlaced, bool margins)
623 {
624 #define HV_FACTOR			1000
625 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
626 #define	CVT_MARGIN_PERCENTAGE		18
627 	/* 2) character cell horizontal granularity (pixels) - default 8 */
628 #define	CVT_H_GRANULARITY		8
629 	/* 3) Minimum vertical porch (lines) - default 3 */
630 #define	CVT_MIN_V_PORCH			3
631 	/* 4) Minimum number of vertical back porch lines - default 6 */
632 #define	CVT_MIN_V_BPORCH		6
633 	/* Pixel Clock step (kHz) */
634 #define CVT_CLOCK_STEP			250
635 	struct drm_display_mode *drm_mode;
636 	unsigned int vfieldrate, hperiod;
637 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
638 	int interlace;
639 	u64 tmp;
640 
641 	if (!hdisplay || !vdisplay)
642 		return NULL;
643 
644 	/* allocate the drm_display_mode structure. If failure, we will
645 	 * return directly
646 	 */
647 	drm_mode = drm_mode_create(dev);
648 	if (!drm_mode)
649 		return NULL;
650 
651 	/* the CVT default refresh rate is 60Hz */
652 	if (!vrefresh)
653 		vrefresh = 60;
654 
655 	/* the required field fresh rate */
656 	if (interlaced)
657 		vfieldrate = vrefresh * 2;
658 	else
659 		vfieldrate = vrefresh;
660 
661 	/* horizontal pixels */
662 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
663 
664 	/* determine the left&right borders */
665 	hmargin = 0;
666 	if (margins) {
667 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
668 		hmargin -= hmargin % CVT_H_GRANULARITY;
669 	}
670 	/* find the total active pixels */
671 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
672 
673 	/* find the number of lines per field */
674 	if (interlaced)
675 		vdisplay_rnd = vdisplay / 2;
676 	else
677 		vdisplay_rnd = vdisplay;
678 
679 	/* find the top & bottom borders */
680 	vmargin = 0;
681 	if (margins)
682 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
683 
684 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
685 
686 	/* Interlaced */
687 	if (interlaced)
688 		interlace = 1;
689 	else
690 		interlace = 0;
691 
692 	/* Determine VSync Width from aspect ratio */
693 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
694 		vsync = 4;
695 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
696 		vsync = 5;
697 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
698 		vsync = 6;
699 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
700 		vsync = 7;
701 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
702 		vsync = 7;
703 	else /* custom */
704 		vsync = 10;
705 
706 	if (!reduced) {
707 		/* simplify the GTF calculation */
708 		/* 4) Minimum time of vertical sync + back porch interval (µs)
709 		 * default 550.0
710 		 */
711 		int tmp1, tmp2;
712 #define CVT_MIN_VSYNC_BP	550
713 		/* 3) Nominal HSync width (% of line period) - default 8 */
714 #define CVT_HSYNC_PERCENTAGE	8
715 		unsigned int hblank_percentage;
716 		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
717 
718 		/* estimated the horizontal period */
719 		tmp1 = HV_FACTOR * 1000000  -
720 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
721 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
722 				interlace;
723 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
724 
725 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
726 		/* 9. Find number of lines in sync + backporch */
727 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
728 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
729 		else
730 			vsyncandback_porch = tmp1;
731 		/* 10. Find number of lines in back porch */
732 		vback_porch = vsyncandback_porch - vsync;
733 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
734 				vsyncandback_porch + CVT_MIN_V_PORCH;
735 		/* 5) Definition of Horizontal blanking time limitation */
736 		/* Gradient (%/kHz) - default 600 */
737 #define CVT_M_FACTOR	600
738 		/* Offset (%) - default 40 */
739 #define CVT_C_FACTOR	40
740 		/* Blanking time scaling factor - default 128 */
741 #define CVT_K_FACTOR	128
742 		/* Scaling factor weighting - default 20 */
743 #define CVT_J_FACTOR	20
744 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
745 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
746 			 CVT_J_FACTOR)
747 		/* 12. Find ideal blanking duty cycle from formula */
748 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
749 					hperiod / 1000;
750 		/* 13. Blanking time */
751 		if (hblank_percentage < 20 * HV_FACTOR)
752 			hblank_percentage = 20 * HV_FACTOR;
753 		hblank = drm_mode->hdisplay * hblank_percentage /
754 			 (100 * HV_FACTOR - hblank_percentage);
755 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
756 		/* 14. find the total pixels per line */
757 		drm_mode->htotal = drm_mode->hdisplay + hblank;
758 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
759 		drm_mode->hsync_start = drm_mode->hsync_end -
760 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
761 		drm_mode->hsync_start += CVT_H_GRANULARITY -
762 			drm_mode->hsync_start % CVT_H_GRANULARITY;
763 		/* fill the Vsync values */
764 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
765 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
766 	} else {
767 		/* Reduced blanking */
768 		/* Minimum vertical blanking interval time (µs)- default 460 */
769 #define CVT_RB_MIN_VBLANK	460
770 		/* Fixed number of clocks for horizontal sync */
771 #define CVT_RB_H_SYNC		32
772 		/* Fixed number of clocks for horizontal blanking */
773 #define CVT_RB_H_BLANK		160
774 		/* Fixed number of lines for vertical front porch - default 3*/
775 #define CVT_RB_VFPORCH		3
776 		int vbilines;
777 		int tmp1, tmp2;
778 		/* 8. Estimate Horizontal period. */
779 		tmp1 = HV_FACTOR * 1000000 -
780 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
781 		tmp2 = vdisplay_rnd + 2 * vmargin;
782 		hperiod = tmp1 / (tmp2 * vfieldrate);
783 		/* 9. Find number of lines in vertical blanking */
784 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
785 		/* 10. Check if vertical blanking is sufficient */
786 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
787 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
788 		/* 11. Find total number of lines in vertical field */
789 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
790 		/* 12. Find total number of pixels in a line */
791 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
792 		/* Fill in HSync values */
793 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
794 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
795 		/* Fill in VSync values */
796 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
797 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
798 	}
799 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
800 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
801 	tmp *= HV_FACTOR * 1000;
802 	do_div(tmp, hperiod);
803 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
804 	drm_mode->clock = tmp;
805 	/* 18/16. Find actual vertical frame frequency */
806 	/* ignore - just set the mode flag for interlaced */
807 	if (interlaced) {
808 		drm_mode->vtotal *= 2;
809 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
810 	}
811 	/* Fill the mode line name */
812 	drm_mode_set_name(drm_mode);
813 	if (reduced)
814 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
815 					DRM_MODE_FLAG_NVSYNC);
816 	else
817 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
818 					DRM_MODE_FLAG_NHSYNC);
819 
820 	return drm_mode;
821 }
822 EXPORT_SYMBOL(drm_cvt_mode);
823 
824 /**
825  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
826  * @dev: drm device
827  * @hdisplay: hdisplay size
828  * @vdisplay: vdisplay size
829  * @vrefresh: vrefresh rate.
830  * @interlaced: whether to compute an interlaced mode
831  * @margins: desired margin (borders) size
832  * @GTF_M: extended GTF formula parameters
833  * @GTF_2C: extended GTF formula parameters
834  * @GTF_K: extended GTF formula parameters
835  * @GTF_2J: extended GTF formula parameters
836  *
837  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
838  * in here multiplied by two.  For a C of 40, pass in 80.
839  *
840  * Returns:
841  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
842  * The display mode object is allocated with drm_mode_create(). Returns NULL
843  * when no mode could be allocated.
844  */
845 struct drm_display_mode *
drm_gtf_mode_complex(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins,int GTF_M,int GTF_2C,int GTF_K,int GTF_2J)846 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
847 		     int vrefresh, bool interlaced, int margins,
848 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
849 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
850 #define	GTF_MARGIN_PERCENTAGE		18
851 	/* 2) character cell horizontal granularity (pixels) - default 8 */
852 #define	GTF_CELL_GRAN			8
853 	/* 3) Minimum vertical porch (lines) - default 3 */
854 #define	GTF_MIN_V_PORCH			1
855 	/* width of vsync in lines */
856 #define V_SYNC_RQD			3
857 	/* width of hsync as % of total line */
858 #define H_SYNC_PERCENT			8
859 	/* min time of vsync + back porch (microsec) */
860 #define MIN_VSYNC_PLUS_BP		550
861 	/* C' and M' are part of the Blanking Duty Cycle computation */
862 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
863 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
864 	struct drm_display_mode *drm_mode;
865 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
866 	int top_margin, bottom_margin;
867 	int interlace;
868 	unsigned int hfreq_est;
869 	int vsync_plus_bp, __maybe_unused vback_porch;
870 	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
871 	unsigned int __maybe_unused hperiod;
872 	unsigned int vfield_rate, __maybe_unused vframe_rate;
873 	int left_margin, right_margin;
874 	unsigned int total_active_pixels, ideal_duty_cycle;
875 	unsigned int hblank, total_pixels, pixel_freq;
876 	int hsync, hfront_porch, vodd_front_porch_lines;
877 	unsigned int tmp1, tmp2;
878 
879 	if (!hdisplay || !vdisplay)
880 		return NULL;
881 
882 	drm_mode = drm_mode_create(dev);
883 	if (!drm_mode)
884 		return NULL;
885 
886 	/* 1. In order to give correct results, the number of horizontal
887 	 * pixels requested is first processed to ensure that it is divisible
888 	 * by the character size, by rounding it to the nearest character
889 	 * cell boundary:
890 	 */
891 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
892 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
893 
894 	/* 2. If interlace is requested, the number of vertical lines assumed
895 	 * by the calculation must be halved, as the computation calculates
896 	 * the number of vertical lines per field.
897 	 */
898 	if (interlaced)
899 		vdisplay_rnd = vdisplay / 2;
900 	else
901 		vdisplay_rnd = vdisplay;
902 
903 	/* 3. Find the frame rate required: */
904 	if (interlaced)
905 		vfieldrate_rqd = vrefresh * 2;
906 	else
907 		vfieldrate_rqd = vrefresh;
908 
909 	/* 4. Find number of lines in Top margin: */
910 	top_margin = 0;
911 	if (margins)
912 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
913 				1000;
914 	/* 5. Find number of lines in bottom margin: */
915 	bottom_margin = top_margin;
916 
917 	/* 6. If interlace is required, then set variable interlace: */
918 	if (interlaced)
919 		interlace = 1;
920 	else
921 		interlace = 0;
922 
923 	/* 7. Estimate the Horizontal frequency */
924 	{
925 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
926 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
927 				2 + interlace;
928 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
929 	}
930 
931 	/* 8. Find the number of lines in V sync + back porch */
932 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
933 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
934 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
935 	/*  9. Find the number of lines in V back porch alone: */
936 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
937 	/*  10. Find the total number of lines in Vertical field period: */
938 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
939 			vsync_plus_bp + GTF_MIN_V_PORCH;
940 	/*  11. Estimate the Vertical field frequency: */
941 	vfieldrate_est = hfreq_est / vtotal_lines;
942 	/*  12. Find the actual horizontal period: */
943 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
944 
945 	/*  13. Find the actual Vertical field frequency: */
946 	vfield_rate = hfreq_est / vtotal_lines;
947 	/*  14. Find the Vertical frame frequency: */
948 	if (interlaced)
949 		vframe_rate = vfield_rate / 2;
950 	else
951 		vframe_rate = vfield_rate;
952 	/*  15. Find number of pixels in left margin: */
953 	if (margins)
954 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
955 				1000;
956 	else
957 		left_margin = 0;
958 
959 	/* 16.Find number of pixels in right margin: */
960 	right_margin = left_margin;
961 	/* 17.Find total number of active pixels in image and left and right */
962 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
963 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
964 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
965 				(GTF_M_PRIME * 1000000 / hfreq_est);
966 	/* 19.Find the number of pixels in the blanking time to the nearest
967 	 * double character cell: */
968 	hblank = total_active_pixels * ideal_duty_cycle /
969 			(100000 - ideal_duty_cycle);
970 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
971 	hblank = hblank * 2 * GTF_CELL_GRAN;
972 	/* 20.Find total number of pixels: */
973 	total_pixels = total_active_pixels + hblank;
974 	/* 21.Find pixel clock frequency: */
975 	pixel_freq = total_pixels * hfreq_est / 1000;
976 	/* Stage 1 computations are now complete; I should really pass
977 	 * the results to another function and do the Stage 2 computations,
978 	 * but I only need a few more values so I'll just append the
979 	 * computations here for now */
980 	/* 17. Find the number of pixels in the horizontal sync period: */
981 	hsync = H_SYNC_PERCENT * total_pixels / 100;
982 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
983 	hsync = hsync * GTF_CELL_GRAN;
984 	/* 18. Find the number of pixels in horizontal front porch period */
985 	hfront_porch = hblank / 2 - hsync;
986 	/*  36. Find the number of lines in the odd front porch period: */
987 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
988 
989 	/* finally, pack the results in the mode struct */
990 	drm_mode->hdisplay = hdisplay_rnd;
991 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
992 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
993 	drm_mode->htotal = total_pixels;
994 	drm_mode->vdisplay = vdisplay_rnd;
995 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
996 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
997 	drm_mode->vtotal = vtotal_lines;
998 
999 	drm_mode->clock = pixel_freq;
1000 
1001 	if (interlaced) {
1002 		drm_mode->vtotal *= 2;
1003 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1004 	}
1005 
1006 	drm_mode_set_name(drm_mode);
1007 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1008 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1009 	else
1010 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1011 
1012 	return drm_mode;
1013 }
1014 EXPORT_SYMBOL(drm_gtf_mode_complex);
1015 
1016 /**
1017  * drm_gtf_mode - create the modeline based on the GTF algorithm
1018  * @dev: drm device
1019  * @hdisplay: hdisplay size
1020  * @vdisplay: vdisplay size
1021  * @vrefresh: vrefresh rate.
1022  * @interlaced: whether to compute an interlaced mode
1023  * @margins: desired margin (borders) size
1024  *
1025  * return the modeline based on GTF algorithm
1026  *
1027  * This function is to create the modeline based on the GTF algorithm.
1028  * Generalized Timing Formula is derived from:
1029  *
1030  *	GTF Spreadsheet by Andy Morrish (1/5/97)
1031  *	available at https://www.vesa.org
1032  *
1033  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1034  * What I have done is to translate it by using integer calculation.
1035  * I also refer to the function of fb_get_mode in the file of
1036  * drivers/video/fbmon.c
1037  *
1038  * Standard GTF parameters::
1039  *
1040  *     M = 600
1041  *     C = 40
1042  *     K = 128
1043  *     J = 20
1044  *
1045  * Returns:
1046  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
1047  * The display mode object is allocated with drm_mode_create(). Returns NULL
1048  * when no mode could be allocated.
1049  */
1050 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)1051 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1052 	     bool interlaced, int margins)
1053 {
1054 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1055 				    interlaced, margins,
1056 				    600, 40 * 2, 128, 20 * 2);
1057 }
1058 EXPORT_SYMBOL(drm_gtf_mode);
1059 
1060 #ifdef CONFIG_VIDEOMODE_HELPERS
1061 /**
1062  * drm_display_mode_from_videomode - fill in @dmode using @vm,
1063  * @vm: videomode structure to use as source
1064  * @dmode: drm_display_mode structure to use as destination
1065  *
1066  * Fills out @dmode using the display mode specified in @vm.
1067  */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)1068 void drm_display_mode_from_videomode(const struct videomode *vm,
1069 				     struct drm_display_mode *dmode)
1070 {
1071 	dmode->hdisplay = vm->hactive;
1072 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1073 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1074 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
1075 
1076 	dmode->vdisplay = vm->vactive;
1077 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1078 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1079 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1080 
1081 	dmode->clock = vm->pixelclock / 1000;
1082 
1083 	dmode->flags = 0;
1084 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1085 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1086 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1087 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1088 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1089 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1090 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1091 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1092 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1093 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1094 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1095 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1096 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1097 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1098 	drm_mode_set_name(dmode);
1099 }
1100 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1101 
1102 /**
1103  * drm_display_mode_to_videomode - fill in @vm using @dmode,
1104  * @dmode: drm_display_mode structure to use as source
1105  * @vm: videomode structure to use as destination
1106  *
1107  * Fills out @vm using the display mode specified in @dmode.
1108  */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)1109 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1110 				   struct videomode *vm)
1111 {
1112 	vm->hactive = dmode->hdisplay;
1113 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1114 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1115 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
1116 
1117 	vm->vactive = dmode->vdisplay;
1118 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1119 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1120 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1121 
1122 	vm->pixelclock = dmode->clock * 1000;
1123 
1124 	vm->flags = 0;
1125 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1126 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1127 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1128 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1129 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1130 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1131 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1132 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1133 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1134 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
1135 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1136 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1137 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1138 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1139 }
1140 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1141 
1142 /**
1143  * drm_bus_flags_from_videomode - extract information about pixelclk and
1144  * DE polarity from videomode and store it in a separate variable
1145  * @vm: videomode structure to use
1146  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
1147  * here
1148  *
1149  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1150  * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1151  * found in @vm
1152  */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)1153 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1154 {
1155 	*bus_flags = 0;
1156 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1157 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1158 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1159 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1160 
1161 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1162 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1163 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1164 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1165 
1166 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1167 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
1168 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1169 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1170 }
1171 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1172 
1173 #ifdef CONFIG_OF
1174 /**
1175  * of_get_drm_display_mode - get a drm_display_mode from devicetree
1176  * @np: device_node with the timing specification
1177  * @dmode: will be set to the return value
1178  * @bus_flags: information about pixelclk, sync and DE polarity
1179  * @index: index into the list of display timings in devicetree
1180  *
1181  * This function is expensive and should only be used, if only one mode is to be
1182  * read from DT. To get multiple modes start with of_get_display_timings and
1183  * work with that instead.
1184  *
1185  * Returns:
1186  * 0 on success, a negative errno code when no of videomode node was found.
1187  */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)1188 int of_get_drm_display_mode(struct device_node *np,
1189 			    struct drm_display_mode *dmode, u32 *bus_flags,
1190 			    int index)
1191 {
1192 	struct videomode vm;
1193 	int ret;
1194 
1195 	ret = of_get_videomode(np, &vm, index);
1196 	if (ret)
1197 		return ret;
1198 
1199 	drm_display_mode_from_videomode(&vm, dmode);
1200 	if (bus_flags)
1201 		drm_bus_flags_from_videomode(&vm, bus_flags);
1202 
1203 	pr_debug("%pOF: got %dx%d display mode\n",
1204 		np, vm.hactive, vm.vactive);
1205 	drm_mode_debug_printmodeline(dmode);
1206 
1207 	return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1210 
1211 /**
1212  * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1213  * @np: device_node with the panel-timing specification
1214  * @dmode: will be set to the return value
1215  * @bus_flags: information about pixelclk, sync and DE polarity
1216  *
1217  * The mandatory Device Tree properties width-mm and height-mm
1218  * are read and set on the display mode.
1219  *
1220  * Returns:
1221  * Zero on success, negative error code on failure.
1222  */
of_get_drm_panel_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags)1223 int of_get_drm_panel_display_mode(struct device_node *np,
1224 				  struct drm_display_mode *dmode, u32 *bus_flags)
1225 {
1226 	u32 width_mm = 0, height_mm = 0;
1227 	struct display_timing timing;
1228 	struct videomode vm;
1229 	int ret;
1230 
1231 	ret = of_get_display_timing(np, "panel-timing", &timing);
1232 	if (ret)
1233 		return ret;
1234 
1235 	videomode_from_timing(&timing, &vm);
1236 
1237 	memset(dmode, 0, sizeof(*dmode));
1238 	drm_display_mode_from_videomode(&vm, dmode);
1239 	if (bus_flags)
1240 		drm_bus_flags_from_videomode(&vm, bus_flags);
1241 
1242 	ret = of_property_read_u32(np, "width-mm", &width_mm);
1243 	if (ret)
1244 		return ret;
1245 
1246 	ret = of_property_read_u32(np, "height-mm", &height_mm);
1247 	if (ret)
1248 		return ret;
1249 
1250 	dmode->width_mm = width_mm;
1251 	dmode->height_mm = height_mm;
1252 
1253 	drm_mode_debug_printmodeline(dmode);
1254 
1255 	return 0;
1256 }
1257 EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1258 #endif /* CONFIG_OF */
1259 #endif /* CONFIG_VIDEOMODE_HELPERS */
1260 
1261 /**
1262  * drm_mode_set_name - set the name on a mode
1263  * @mode: name will be set in this mode
1264  *
1265  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1266  * with an optional 'i' suffix for interlaced modes.
1267  */
drm_mode_set_name(struct drm_display_mode * mode)1268 void drm_mode_set_name(struct drm_display_mode *mode)
1269 {
1270 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1271 
1272 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
1273 		 mode->hdisplay, mode->vdisplay,
1274 		 interlaced ? "i" : "");
1275 }
1276 EXPORT_SYMBOL(drm_mode_set_name);
1277 
1278 /**
1279  * drm_mode_vrefresh - get the vrefresh of a mode
1280  * @mode: mode
1281  *
1282  * Returns:
1283  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
1284  * value first if it is not yet set.
1285  */
drm_mode_vrefresh(const struct drm_display_mode * mode)1286 int drm_mode_vrefresh(const struct drm_display_mode *mode)
1287 {
1288 	unsigned int num, den;
1289 
1290 	if (mode->htotal == 0 || mode->vtotal == 0)
1291 		return 0;
1292 
1293 	num = mode->clock;
1294 	den = mode->htotal * mode->vtotal;
1295 
1296 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1297 		num *= 2;
1298 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1299 		den *= 2;
1300 	if (mode->vscan > 1)
1301 		den *= mode->vscan;
1302 
1303 	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1304 }
1305 EXPORT_SYMBOL(drm_mode_vrefresh);
1306 
1307 /**
1308  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1309  * @mode: mode to query
1310  * @hdisplay: hdisplay value to fill in
1311  * @vdisplay: vdisplay value to fill in
1312  *
1313  * The vdisplay value will be doubled if the specified mode is a stereo mode of
1314  * the appropriate layout.
1315  */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)1316 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1317 			    int *hdisplay, int *vdisplay)
1318 {
1319 	struct drm_display_mode adjusted;
1320 
1321 	drm_mode_init(&adjusted, mode);
1322 
1323 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
1324 	*hdisplay = adjusted.crtc_hdisplay;
1325 	*vdisplay = adjusted.crtc_vdisplay;
1326 }
1327 EXPORT_SYMBOL(drm_mode_get_hv_timing);
1328 
1329 /**
1330  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1331  * @p: mode
1332  * @adjust_flags: a combination of adjustment flags
1333  *
1334  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1335  *
1336  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1337  *   interlaced modes.
1338  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1339  *   buffers containing two eyes (only adjust the timings when needed, eg. for
1340  *   "frame packing" or "side by side full").
1341  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1342  *   be performed for doublescan and vscan > 1 modes respectively.
1343  */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)1344 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1345 {
1346 	if (!p)
1347 		return;
1348 
1349 	p->crtc_clock = p->clock;
1350 	p->crtc_hdisplay = p->hdisplay;
1351 	p->crtc_hsync_start = p->hsync_start;
1352 	p->crtc_hsync_end = p->hsync_end;
1353 	p->crtc_htotal = p->htotal;
1354 	p->crtc_hskew = p->hskew;
1355 	p->crtc_vdisplay = p->vdisplay;
1356 	p->crtc_vsync_start = p->vsync_start;
1357 	p->crtc_vsync_end = p->vsync_end;
1358 	p->crtc_vtotal = p->vtotal;
1359 
1360 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1361 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1362 			p->crtc_vdisplay /= 2;
1363 			p->crtc_vsync_start /= 2;
1364 			p->crtc_vsync_end /= 2;
1365 			p->crtc_vtotal /= 2;
1366 		}
1367 	}
1368 
1369 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1370 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1371 			p->crtc_vdisplay *= 2;
1372 			p->crtc_vsync_start *= 2;
1373 			p->crtc_vsync_end *= 2;
1374 			p->crtc_vtotal *= 2;
1375 		}
1376 	}
1377 
1378 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
1379 		if (p->vscan > 1) {
1380 			p->crtc_vdisplay *= p->vscan;
1381 			p->crtc_vsync_start *= p->vscan;
1382 			p->crtc_vsync_end *= p->vscan;
1383 			p->crtc_vtotal *= p->vscan;
1384 		}
1385 	}
1386 
1387 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
1388 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1389 
1390 		switch (layout) {
1391 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
1392 			p->crtc_clock *= 2;
1393 			p->crtc_vdisplay += p->crtc_vtotal;
1394 			p->crtc_vsync_start += p->crtc_vtotal;
1395 			p->crtc_vsync_end += p->crtc_vtotal;
1396 			p->crtc_vtotal += p->crtc_vtotal;
1397 			break;
1398 		}
1399 	}
1400 
1401 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1402 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1403 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1404 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1405 }
1406 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1407 
1408 /**
1409  * drm_mode_copy - copy the mode
1410  * @dst: mode to overwrite
1411  * @src: mode to copy
1412  *
1413  * Copy an existing mode into another mode, preserving the
1414  * list head of the destination mode.
1415  */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)1416 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1417 {
1418 	struct list_head head = dst->head;
1419 
1420 	*dst = *src;
1421 	dst->head = head;
1422 }
1423 EXPORT_SYMBOL(drm_mode_copy);
1424 
1425 /**
1426  * drm_mode_init - initialize the mode from another mode
1427  * @dst: mode to overwrite
1428  * @src: mode to copy
1429  *
1430  * Copy an existing mode into another mode, zeroing the
1431  * list head of the destination mode. Typically used
1432  * to guarantee the list head is not left with stack
1433  * garbage in on-stack modes.
1434  */
drm_mode_init(struct drm_display_mode * dst,const struct drm_display_mode * src)1435 void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1436 {
1437 	memset(dst, 0, sizeof(*dst));
1438 	drm_mode_copy(dst, src);
1439 }
1440 EXPORT_SYMBOL(drm_mode_init);
1441 
1442 /**
1443  * drm_mode_duplicate - allocate and duplicate an existing mode
1444  * @dev: drm_device to allocate the duplicated mode for
1445  * @mode: mode to duplicate
1446  *
1447  * Just allocate a new mode, copy the existing mode into it, and return
1448  * a pointer to it.  Used to create new instances of established modes.
1449  *
1450  * Returns:
1451  * Pointer to duplicated mode on success, NULL on error.
1452  */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)1453 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1454 					    const struct drm_display_mode *mode)
1455 {
1456 	struct drm_display_mode *nmode;
1457 
1458 	nmode = drm_mode_create(dev);
1459 	if (!nmode)
1460 		return NULL;
1461 
1462 	drm_mode_copy(nmode, mode);
1463 
1464 	return nmode;
1465 }
1466 EXPORT_SYMBOL(drm_mode_duplicate);
1467 
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1468 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1469 				   const struct drm_display_mode *mode2)
1470 {
1471 	return mode1->hdisplay == mode2->hdisplay &&
1472 		mode1->hsync_start == mode2->hsync_start &&
1473 		mode1->hsync_end == mode2->hsync_end &&
1474 		mode1->htotal == mode2->htotal &&
1475 		mode1->hskew == mode2->hskew &&
1476 		mode1->vdisplay == mode2->vdisplay &&
1477 		mode1->vsync_start == mode2->vsync_start &&
1478 		mode1->vsync_end == mode2->vsync_end &&
1479 		mode1->vtotal == mode2->vtotal &&
1480 		mode1->vscan == mode2->vscan;
1481 }
1482 
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1483 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1484 				  const struct drm_display_mode *mode2)
1485 {
1486 	/*
1487 	 * do clock check convert to PICOS
1488 	 * so fb modes get matched the same
1489 	 */
1490 	if (mode1->clock && mode2->clock)
1491 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1492 	else
1493 		return mode1->clock == mode2->clock;
1494 }
1495 
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1496 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1497 				 const struct drm_display_mode *mode2)
1498 {
1499 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1500 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1501 }
1502 
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1503 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1504 				    const struct drm_display_mode *mode2)
1505 {
1506 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1507 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
1508 }
1509 
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1510 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1511 					const struct drm_display_mode *mode2)
1512 {
1513 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1514 }
1515 
1516 /**
1517  * drm_mode_match - test modes for (partial) equality
1518  * @mode1: first mode
1519  * @mode2: second mode
1520  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1521  *
1522  * Check to see if @mode1 and @mode2 are equivalent.
1523  *
1524  * Returns:
1525  * True if the modes are (partially) equal, false otherwise.
1526  */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1527 bool drm_mode_match(const struct drm_display_mode *mode1,
1528 		    const struct drm_display_mode *mode2,
1529 		    unsigned int match_flags)
1530 {
1531 	if (!mode1 && !mode2)
1532 		return true;
1533 
1534 	if (!mode1 || !mode2)
1535 		return false;
1536 
1537 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1538 	    !drm_mode_match_timings(mode1, mode2))
1539 		return false;
1540 
1541 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1542 	    !drm_mode_match_clock(mode1, mode2))
1543 		return false;
1544 
1545 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1546 	    !drm_mode_match_flags(mode1, mode2))
1547 		return false;
1548 
1549 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1550 	    !drm_mode_match_3d_flags(mode1, mode2))
1551 		return false;
1552 
1553 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1554 	    !drm_mode_match_aspect_ratio(mode1, mode2))
1555 		return false;
1556 
1557 	return true;
1558 }
1559 EXPORT_SYMBOL(drm_mode_match);
1560 
1561 /**
1562  * drm_mode_equal - test modes for equality
1563  * @mode1: first mode
1564  * @mode2: second mode
1565  *
1566  * Check to see if @mode1 and @mode2 are equivalent.
1567  *
1568  * Returns:
1569  * True if the modes are equal, false otherwise.
1570  */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1571 bool drm_mode_equal(const struct drm_display_mode *mode1,
1572 		    const struct drm_display_mode *mode2)
1573 {
1574 	return drm_mode_match(mode1, mode2,
1575 			      DRM_MODE_MATCH_TIMINGS |
1576 			      DRM_MODE_MATCH_CLOCK |
1577 			      DRM_MODE_MATCH_FLAGS |
1578 			      DRM_MODE_MATCH_3D_FLAGS|
1579 			      DRM_MODE_MATCH_ASPECT_RATIO);
1580 }
1581 EXPORT_SYMBOL(drm_mode_equal);
1582 
1583 /**
1584  * drm_mode_equal_no_clocks - test modes for equality
1585  * @mode1: first mode
1586  * @mode2: second mode
1587  *
1588  * Check to see if @mode1 and @mode2 are equivalent, but
1589  * don't check the pixel clocks.
1590  *
1591  * Returns:
1592  * True if the modes are equal, false otherwise.
1593  */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1594 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1595 			      const struct drm_display_mode *mode2)
1596 {
1597 	return drm_mode_match(mode1, mode2,
1598 			      DRM_MODE_MATCH_TIMINGS |
1599 			      DRM_MODE_MATCH_FLAGS |
1600 			      DRM_MODE_MATCH_3D_FLAGS);
1601 }
1602 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1603 
1604 /**
1605  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1606  * @mode1: first mode
1607  * @mode2: second mode
1608  *
1609  * Check to see if @mode1 and @mode2 are equivalent, but
1610  * don't check the pixel clocks nor the stereo layout.
1611  *
1612  * Returns:
1613  * True if the modes are equal, false otherwise.
1614  */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1615 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1616 					const struct drm_display_mode *mode2)
1617 {
1618 	return drm_mode_match(mode1, mode2,
1619 			      DRM_MODE_MATCH_TIMINGS |
1620 			      DRM_MODE_MATCH_FLAGS);
1621 }
1622 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1623 
1624 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1625 drm_mode_validate_basic(const struct drm_display_mode *mode)
1626 {
1627 	if (mode->type & ~DRM_MODE_TYPE_ALL)
1628 		return MODE_BAD;
1629 
1630 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1631 		return MODE_BAD;
1632 
1633 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1634 		return MODE_BAD;
1635 
1636 	if (mode->clock == 0)
1637 		return MODE_CLOCK_LOW;
1638 
1639 	if (mode->hdisplay == 0 ||
1640 	    mode->hsync_start < mode->hdisplay ||
1641 	    mode->hsync_end < mode->hsync_start ||
1642 	    mode->htotal < mode->hsync_end)
1643 		return MODE_H_ILLEGAL;
1644 
1645 	if (mode->vdisplay == 0 ||
1646 	    mode->vsync_start < mode->vdisplay ||
1647 	    mode->vsync_end < mode->vsync_start ||
1648 	    mode->vtotal < mode->vsync_end)
1649 		return MODE_V_ILLEGAL;
1650 
1651 	return MODE_OK;
1652 }
1653 
1654 /**
1655  * drm_mode_validate_driver - make sure the mode is somewhat sane
1656  * @dev: drm device
1657  * @mode: mode to check
1658  *
1659  * First do basic validation on the mode, and then allow the driver
1660  * to check for device/driver specific limitations via the optional
1661  * &drm_mode_config_helper_funcs.mode_valid hook.
1662  *
1663  * Returns:
1664  * The mode status
1665  */
1666 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1667 drm_mode_validate_driver(struct drm_device *dev,
1668 			const struct drm_display_mode *mode)
1669 {
1670 	enum drm_mode_status status;
1671 
1672 	status = drm_mode_validate_basic(mode);
1673 	if (status != MODE_OK)
1674 		return status;
1675 
1676 	if (dev->mode_config.funcs->mode_valid)
1677 		return dev->mode_config.funcs->mode_valid(dev, mode);
1678 	else
1679 		return MODE_OK;
1680 }
1681 EXPORT_SYMBOL(drm_mode_validate_driver);
1682 
1683 /**
1684  * drm_mode_validate_size - make sure modes adhere to size constraints
1685  * @mode: mode to check
1686  * @maxX: maximum width
1687  * @maxY: maximum height
1688  *
1689  * This function is a helper which can be used to validate modes against size
1690  * limitations of the DRM device/connector. If a mode is too big its status
1691  * member is updated with the appropriate validation failure code. The list
1692  * itself is not changed.
1693  *
1694  * Returns:
1695  * The mode status
1696  */
1697 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1698 drm_mode_validate_size(const struct drm_display_mode *mode,
1699 		       int maxX, int maxY)
1700 {
1701 	if (maxX > 0 && mode->hdisplay > maxX)
1702 		return MODE_VIRTUAL_X;
1703 
1704 	if (maxY > 0 && mode->vdisplay > maxY)
1705 		return MODE_VIRTUAL_Y;
1706 
1707 	return MODE_OK;
1708 }
1709 EXPORT_SYMBOL(drm_mode_validate_size);
1710 
1711 /**
1712  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1713  * @mode: mode to check
1714  * @connector: drm connector under action
1715  *
1716  * This function is a helper which can be used to filter out any YCBCR420
1717  * only mode, when the source doesn't support it.
1718  *
1719  * Returns:
1720  * The mode status
1721  */
1722 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1723 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1724 			   struct drm_connector *connector)
1725 {
1726 	if (!connector->ycbcr_420_allowed &&
1727 	    drm_mode_is_420_only(&connector->display_info, mode))
1728 		return MODE_NO_420;
1729 
1730 	return MODE_OK;
1731 }
1732 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1733 
1734 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1735 
1736 static const char * const drm_mode_status_names[] = {
1737 	MODE_STATUS(OK),
1738 	MODE_STATUS(HSYNC),
1739 	MODE_STATUS(VSYNC),
1740 	MODE_STATUS(H_ILLEGAL),
1741 	MODE_STATUS(V_ILLEGAL),
1742 	MODE_STATUS(BAD_WIDTH),
1743 	MODE_STATUS(NOMODE),
1744 	MODE_STATUS(NO_INTERLACE),
1745 	MODE_STATUS(NO_DBLESCAN),
1746 	MODE_STATUS(NO_VSCAN),
1747 	MODE_STATUS(MEM),
1748 	MODE_STATUS(VIRTUAL_X),
1749 	MODE_STATUS(VIRTUAL_Y),
1750 	MODE_STATUS(MEM_VIRT),
1751 	MODE_STATUS(NOCLOCK),
1752 	MODE_STATUS(CLOCK_HIGH),
1753 	MODE_STATUS(CLOCK_LOW),
1754 	MODE_STATUS(CLOCK_RANGE),
1755 	MODE_STATUS(BAD_HVALUE),
1756 	MODE_STATUS(BAD_VVALUE),
1757 	MODE_STATUS(BAD_VSCAN),
1758 	MODE_STATUS(HSYNC_NARROW),
1759 	MODE_STATUS(HSYNC_WIDE),
1760 	MODE_STATUS(HBLANK_NARROW),
1761 	MODE_STATUS(HBLANK_WIDE),
1762 	MODE_STATUS(VSYNC_NARROW),
1763 	MODE_STATUS(VSYNC_WIDE),
1764 	MODE_STATUS(VBLANK_NARROW),
1765 	MODE_STATUS(VBLANK_WIDE),
1766 	MODE_STATUS(PANEL),
1767 	MODE_STATUS(INTERLACE_WIDTH),
1768 	MODE_STATUS(ONE_WIDTH),
1769 	MODE_STATUS(ONE_HEIGHT),
1770 	MODE_STATUS(ONE_SIZE),
1771 	MODE_STATUS(NO_REDUCED),
1772 	MODE_STATUS(NO_STEREO),
1773 	MODE_STATUS(NO_420),
1774 	MODE_STATUS(STALE),
1775 	MODE_STATUS(BAD),
1776 	MODE_STATUS(ERROR),
1777 };
1778 
1779 #undef MODE_STATUS
1780 
drm_get_mode_status_name(enum drm_mode_status status)1781 const char *drm_get_mode_status_name(enum drm_mode_status status)
1782 {
1783 	int index = status + 3;
1784 
1785 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1786 		return "";
1787 
1788 	return drm_mode_status_names[index];
1789 }
1790 
1791 /**
1792  * drm_mode_prune_invalid - remove invalid modes from mode list
1793  * @dev: DRM device
1794  * @mode_list: list of modes to check
1795  * @verbose: be verbose about it
1796  *
1797  * This helper function can be used to prune a display mode list after
1798  * validation has been completed. All modes whose status is not MODE_OK will be
1799  * removed from the list, and if @verbose the status code and mode name is also
1800  * printed to dmesg.
1801  */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1802 void drm_mode_prune_invalid(struct drm_device *dev,
1803 			    struct list_head *mode_list, bool verbose)
1804 {
1805 	struct drm_display_mode *mode, *t;
1806 
1807 	list_for_each_entry_safe(mode, t, mode_list, head) {
1808 		if (mode->status != MODE_OK) {
1809 			list_del(&mode->head);
1810 			if (mode->type & DRM_MODE_TYPE_USERDEF) {
1811 				drm_warn(dev, "User-defined mode not supported: "
1812 					 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1813 			}
1814 			if (verbose) {
1815 				drm_mode_debug_printmodeline(mode);
1816 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1817 					      mode->name,
1818 					      drm_get_mode_status_name(mode->status));
1819 			}
1820 			drm_mode_destroy(dev, mode);
1821 		}
1822 	}
1823 }
1824 EXPORT_SYMBOL(drm_mode_prune_invalid);
1825 
1826 /**
1827  * drm_mode_compare - compare modes for favorability
1828  * @priv: unused
1829  * @lh_a: list_head for first mode
1830  * @lh_b: list_head for second mode
1831  *
1832  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1833  * which is better.
1834  *
1835  * Returns:
1836  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1837  * positive if @lh_b is better than @lh_a.
1838  */
drm_mode_compare(void * priv,const struct list_head * lh_a,const struct list_head * lh_b)1839 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1840 			    const struct list_head *lh_b)
1841 {
1842 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1843 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1844 	int diff;
1845 
1846 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1847 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1848 	if (diff)
1849 		return diff;
1850 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1851 	if (diff)
1852 		return diff;
1853 
1854 	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1855 	if (diff)
1856 		return diff;
1857 
1858 	diff = b->clock - a->clock;
1859 	return diff;
1860 }
1861 
1862 /**
1863  * drm_mode_sort - sort mode list
1864  * @mode_list: list of drm_display_mode structures to sort
1865  *
1866  * Sort @mode_list by favorability, moving good modes to the head of the list.
1867  */
drm_mode_sort(struct list_head * mode_list)1868 void drm_mode_sort(struct list_head *mode_list)
1869 {
1870 	list_sort(NULL, mode_list, drm_mode_compare);
1871 }
1872 EXPORT_SYMBOL(drm_mode_sort);
1873 
1874 /**
1875  * drm_connector_list_update - update the mode list for the connector
1876  * @connector: the connector to update
1877  *
1878  * This moves the modes from the @connector probed_modes list
1879  * to the actual mode list. It compares the probed mode against the current
1880  * list and only adds different/new modes.
1881  *
1882  * This is just a helper functions doesn't validate any modes itself and also
1883  * doesn't prune any invalid modes. Callers need to do that themselves.
1884  */
drm_connector_list_update(struct drm_connector * connector)1885 void drm_connector_list_update(struct drm_connector *connector)
1886 {
1887 	struct drm_display_mode *pmode, *pt;
1888 
1889 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1890 
1891 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1892 		struct drm_display_mode *mode;
1893 		bool found_it = false;
1894 
1895 		/* go through current modes checking for the new probed mode */
1896 		list_for_each_entry(mode, &connector->modes, head) {
1897 			if (!drm_mode_equal(pmode, mode))
1898 				continue;
1899 
1900 			found_it = true;
1901 
1902 			/*
1903 			 * If the old matching mode is stale (ie. left over
1904 			 * from a previous probe) just replace it outright.
1905 			 * Otherwise just merge the type bits between all
1906 			 * equal probed modes.
1907 			 *
1908 			 * If two probed modes are considered equal, pick the
1909 			 * actual timings from the one that's marked as
1910 			 * preferred (in case the match isn't 100%). If
1911 			 * multiple or zero preferred modes are present, favor
1912 			 * the mode added to the probed_modes list first.
1913 			 */
1914 			if (mode->status == MODE_STALE) {
1915 				drm_mode_copy(mode, pmode);
1916 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1917 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1918 				pmode->type |= mode->type;
1919 				drm_mode_copy(mode, pmode);
1920 			} else {
1921 				mode->type |= pmode->type;
1922 			}
1923 
1924 			list_del(&pmode->head);
1925 			drm_mode_destroy(connector->dev, pmode);
1926 			break;
1927 		}
1928 
1929 		if (!found_it) {
1930 			list_move_tail(&pmode->head, &connector->modes);
1931 		}
1932 	}
1933 }
1934 EXPORT_SYMBOL(drm_connector_list_update);
1935 
drm_mode_parse_cmdline_bpp(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1936 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1937 				      struct drm_cmdline_mode *mode)
1938 {
1939 	unsigned int bpp;
1940 
1941 	if (str[0] != '-')
1942 		return -EINVAL;
1943 
1944 	str++;
1945 	bpp = simple_strtol(str, end_ptr, 10);
1946 	if (*end_ptr == str)
1947 		return -EINVAL;
1948 
1949 	mode->bpp = bpp;
1950 	mode->bpp_specified = true;
1951 
1952 	return 0;
1953 }
1954 
drm_mode_parse_cmdline_refresh(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1955 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1956 					  struct drm_cmdline_mode *mode)
1957 {
1958 	unsigned int refresh;
1959 
1960 	if (str[0] != '@')
1961 		return -EINVAL;
1962 
1963 	str++;
1964 	refresh = simple_strtol(str, end_ptr, 10);
1965 	if (*end_ptr == str)
1966 		return -EINVAL;
1967 
1968 	mode->refresh = refresh;
1969 	mode->refresh_specified = true;
1970 
1971 	return 0;
1972 }
1973 
drm_mode_parse_cmdline_extra(const char * str,int length,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1974 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1975 					bool freestanding,
1976 					const struct drm_connector *connector,
1977 					struct drm_cmdline_mode *mode)
1978 {
1979 	int i;
1980 
1981 	for (i = 0; i < length; i++) {
1982 		switch (str[i]) {
1983 		case 'i':
1984 			if (freestanding)
1985 				return -EINVAL;
1986 
1987 			mode->interlace = true;
1988 			break;
1989 		case 'm':
1990 			if (freestanding)
1991 				return -EINVAL;
1992 
1993 			mode->margins = true;
1994 			break;
1995 		case 'D':
1996 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1997 				return -EINVAL;
1998 
1999 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2000 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2001 				mode->force = DRM_FORCE_ON;
2002 			else
2003 				mode->force = DRM_FORCE_ON_DIGITAL;
2004 			break;
2005 		case 'd':
2006 			if (mode->force != DRM_FORCE_UNSPECIFIED)
2007 				return -EINVAL;
2008 
2009 			mode->force = DRM_FORCE_OFF;
2010 			break;
2011 		case 'e':
2012 			if (mode->force != DRM_FORCE_UNSPECIFIED)
2013 				return -EINVAL;
2014 
2015 			mode->force = DRM_FORCE_ON;
2016 			break;
2017 		default:
2018 			return -EINVAL;
2019 		}
2020 	}
2021 
2022 	return 0;
2023 }
2024 
drm_mode_parse_cmdline_res_mode(const char * str,unsigned int length,bool extras,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2025 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2026 					   bool extras,
2027 					   const struct drm_connector *connector,
2028 					   struct drm_cmdline_mode *mode)
2029 {
2030 	const char *str_start = str;
2031 	bool rb = false, cvt = false;
2032 	int xres = 0, yres = 0;
2033 	int remaining, i;
2034 	char *end_ptr;
2035 
2036 	xres = simple_strtol(str, &end_ptr, 10);
2037 	if (end_ptr == str)
2038 		return -EINVAL;
2039 
2040 	if (end_ptr[0] != 'x')
2041 		return -EINVAL;
2042 	end_ptr++;
2043 
2044 	str = end_ptr;
2045 	yres = simple_strtol(str, &end_ptr, 10);
2046 	if (end_ptr == str)
2047 		return -EINVAL;
2048 
2049 	remaining = length - (end_ptr - str_start);
2050 	if (remaining < 0)
2051 		return -EINVAL;
2052 
2053 	for (i = 0; i < remaining; i++) {
2054 		switch (end_ptr[i]) {
2055 		case 'M':
2056 			cvt = true;
2057 			break;
2058 		case 'R':
2059 			rb = true;
2060 			break;
2061 		default:
2062 			/*
2063 			 * Try to pass that to our extras parsing
2064 			 * function to handle the case where the
2065 			 * extras are directly after the resolution
2066 			 */
2067 			if (extras) {
2068 				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
2069 								       1,
2070 								       false,
2071 								       connector,
2072 								       mode);
2073 				if (ret)
2074 					return ret;
2075 			} else {
2076 				return -EINVAL;
2077 			}
2078 		}
2079 	}
2080 
2081 	mode->xres = xres;
2082 	mode->yres = yres;
2083 	mode->cvt = cvt;
2084 	mode->rb = rb;
2085 
2086 	return 0;
2087 }
2088 
drm_mode_parse_cmdline_int(const char * delim,unsigned int * int_ret)2089 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2090 {
2091 	const char *value;
2092 	char *endp;
2093 
2094 	/*
2095 	 * delim must point to the '=', otherwise it is a syntax error and
2096 	 * if delim points to the terminating zero, then delim + 1 will point
2097 	 * past the end of the string.
2098 	 */
2099 	if (*delim != '=')
2100 		return -EINVAL;
2101 
2102 	value = delim + 1;
2103 	*int_ret = simple_strtol(value, &endp, 10);
2104 
2105 	/* Make sure we have parsed something */
2106 	if (endp == value)
2107 		return -EINVAL;
2108 
2109 	return 0;
2110 }
2111 
drm_mode_parse_panel_orientation(const char * delim,struct drm_cmdline_mode * mode)2112 static int drm_mode_parse_panel_orientation(const char *delim,
2113 					    struct drm_cmdline_mode *mode)
2114 {
2115 	const char *value;
2116 
2117 	if (*delim != '=')
2118 		return -EINVAL;
2119 
2120 	value = delim + 1;
2121 	delim = strchr(value, ',');
2122 	if (!delim)
2123 		delim = value + strlen(value);
2124 
2125 	if (!strncmp(value, "normal", delim - value))
2126 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2127 	else if (!strncmp(value, "upside_down", delim - value))
2128 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2129 	else if (!strncmp(value, "left_side_up", delim - value))
2130 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2131 	else if (!strncmp(value, "right_side_up", delim - value))
2132 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2133 	else
2134 		return -EINVAL;
2135 
2136 	return 0;
2137 }
2138 
drm_mode_parse_tv_mode(const char * delim,struct drm_cmdline_mode * mode)2139 static int drm_mode_parse_tv_mode(const char *delim,
2140 				  struct drm_cmdline_mode *mode)
2141 {
2142 	const char *value;
2143 	int ret;
2144 
2145 	if (*delim != '=')
2146 		return -EINVAL;
2147 
2148 	value = delim + 1;
2149 	delim = strchr(value, ',');
2150 	if (!delim)
2151 		delim = value + strlen(value);
2152 
2153 	ret = drm_get_tv_mode_from_name(value, delim - value);
2154 	if (ret < 0)
2155 		return ret;
2156 
2157 	mode->tv_mode_specified = true;
2158 	mode->tv_mode = ret;
2159 
2160 	return 0;
2161 }
2162 
drm_mode_parse_cmdline_options(const char * str,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2163 static int drm_mode_parse_cmdline_options(const char *str,
2164 					  bool freestanding,
2165 					  const struct drm_connector *connector,
2166 					  struct drm_cmdline_mode *mode)
2167 {
2168 	unsigned int deg, margin, rotation = 0;
2169 	const char *delim, *option, *sep;
2170 
2171 	option = str;
2172 	do {
2173 		delim = strchr(option, '=');
2174 		if (!delim) {
2175 			delim = strchr(option, ',');
2176 
2177 			if (!delim)
2178 				delim = option + strlen(option);
2179 		}
2180 
2181 		if (!strncmp(option, "rotate", delim - option)) {
2182 			if (drm_mode_parse_cmdline_int(delim, &deg))
2183 				return -EINVAL;
2184 
2185 			switch (deg) {
2186 			case 0:
2187 				rotation |= DRM_MODE_ROTATE_0;
2188 				break;
2189 
2190 			case 90:
2191 				rotation |= DRM_MODE_ROTATE_90;
2192 				break;
2193 
2194 			case 180:
2195 				rotation |= DRM_MODE_ROTATE_180;
2196 				break;
2197 
2198 			case 270:
2199 				rotation |= DRM_MODE_ROTATE_270;
2200 				break;
2201 
2202 			default:
2203 				return -EINVAL;
2204 			}
2205 		} else if (!strncmp(option, "reflect_x", delim - option)) {
2206 			rotation |= DRM_MODE_REFLECT_X;
2207 		} else if (!strncmp(option, "reflect_y", delim - option)) {
2208 			rotation |= DRM_MODE_REFLECT_Y;
2209 		} else if (!strncmp(option, "margin_right", delim - option)) {
2210 			if (drm_mode_parse_cmdline_int(delim, &margin))
2211 				return -EINVAL;
2212 
2213 			mode->tv_margins.right = margin;
2214 		} else if (!strncmp(option, "margin_left", delim - option)) {
2215 			if (drm_mode_parse_cmdline_int(delim, &margin))
2216 				return -EINVAL;
2217 
2218 			mode->tv_margins.left = margin;
2219 		} else if (!strncmp(option, "margin_top", delim - option)) {
2220 			if (drm_mode_parse_cmdline_int(delim, &margin))
2221 				return -EINVAL;
2222 
2223 			mode->tv_margins.top = margin;
2224 		} else if (!strncmp(option, "margin_bottom", delim - option)) {
2225 			if (drm_mode_parse_cmdline_int(delim, &margin))
2226 				return -EINVAL;
2227 
2228 			mode->tv_margins.bottom = margin;
2229 		} else if (!strncmp(option, "panel_orientation", delim - option)) {
2230 			if (drm_mode_parse_panel_orientation(delim, mode))
2231 				return -EINVAL;
2232 		} else if (!strncmp(option, "tv_mode", delim - option)) {
2233 			if (drm_mode_parse_tv_mode(delim, mode))
2234 				return -EINVAL;
2235 		} else {
2236 			return -EINVAL;
2237 		}
2238 		sep = strchr(delim, ',');
2239 		option = sep + 1;
2240 	} while (sep);
2241 
2242 	if (rotation && freestanding)
2243 		return -EINVAL;
2244 
2245 	if (!(rotation & DRM_MODE_ROTATE_MASK))
2246 		rotation |= DRM_MODE_ROTATE_0;
2247 
2248 	/* Make sure there is exactly one rotation defined */
2249 	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
2250 		return -EINVAL;
2251 
2252 	mode->rotation_reflection = rotation;
2253 
2254 	return 0;
2255 }
2256 
2257 struct drm_named_mode {
2258 	const char *name;
2259 	unsigned int pixel_clock_khz;
2260 	unsigned int xres;
2261 	unsigned int yres;
2262 	unsigned int flags;
2263 	unsigned int tv_mode;
2264 };
2265 
2266 #define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode)	\
2267 	{						\
2268 		.name = _name,				\
2269 		.pixel_clock_khz = _pclk,		\
2270 		.xres = _x,				\
2271 		.yres = _y,				\
2272 		.flags = _flags,			\
2273 		.tv_mode = _mode,			\
2274 	}
2275 
2276 static const struct drm_named_mode drm_named_modes[] = {
2277 	NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2278 	NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2279 	NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2280 	NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2281 };
2282 
drm_mode_parse_cmdline_named_mode(const char * name,unsigned int name_end,struct drm_cmdline_mode * cmdline_mode)2283 static int drm_mode_parse_cmdline_named_mode(const char *name,
2284 					     unsigned int name_end,
2285 					     struct drm_cmdline_mode *cmdline_mode)
2286 {
2287 	unsigned int i;
2288 
2289 	if (!name_end)
2290 		return 0;
2291 
2292 	/* If the name starts with a digit, it's not a named mode */
2293 	if (isdigit(name[0]))
2294 		return 0;
2295 
2296 	/*
2297 	 * If there's an equal sign in the name, the command-line
2298 	 * contains only an option and no mode.
2299 	 */
2300 	if (strnchr(name, name_end, '='))
2301 		return 0;
2302 
2303 	/* The connection status extras can be set without a mode. */
2304 	if (name_end == 1 &&
2305 	    (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2306 		return 0;
2307 
2308 	/*
2309 	 * We're sure we're a named mode at this point, iterate over the
2310 	 * list of modes we're aware of.
2311 	 */
2312 	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2313 		const struct drm_named_mode *mode = &drm_named_modes[i];
2314 		int ret;
2315 
2316 		ret = str_has_prefix(name, mode->name);
2317 		if (ret != name_end)
2318 			continue;
2319 
2320 		strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2321 		cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2322 		cmdline_mode->xres = mode->xres;
2323 		cmdline_mode->yres = mode->yres;
2324 		cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2325 		cmdline_mode->tv_mode = mode->tv_mode;
2326 		cmdline_mode->tv_mode_specified = true;
2327 		cmdline_mode->specified = true;
2328 
2329 		return 1;
2330 	}
2331 
2332 	return -EINVAL;
2333 }
2334 
2335 /**
2336  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2337  * @mode_option: optional per connector mode option
2338  * @connector: connector to parse modeline for
2339  * @mode: preallocated drm_cmdline_mode structure to fill out
2340  *
2341  * This parses @mode_option command line modeline for modes and options to
2342  * configure the connector.
2343  *
2344  * This uses the same parameters as the fb modedb.c, except for an extra
2345  * force-enable, force-enable-digital and force-disable bit at the end::
2346  *
2347  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2348  *
2349  * Additionals options can be provided following the mode, using a comma to
2350  * separate each option. Valid options can be found in
2351  * Documentation/fb/modedb.rst.
2352  *
2353  * The intermediate drm_cmdline_mode structure is required to store additional
2354  * options from the command line modline like the force-enable/disable flag.
2355  *
2356  * Returns:
2357  * True if a valid modeline has been parsed, false otherwise.
2358  */
drm_mode_parse_command_line_for_connector(const char * mode_option,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2359 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2360 					       const struct drm_connector *connector,
2361 					       struct drm_cmdline_mode *mode)
2362 {
2363 	const char *name;
2364 	bool freestanding = false, parse_extras = false;
2365 	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2366 	unsigned int mode_end = 0;
2367 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2368 	const char *options_ptr = NULL;
2369 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2370 	int len, ret;
2371 
2372 	memset(mode, 0, sizeof(*mode));
2373 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2374 
2375 	if (!mode_option)
2376 		return false;
2377 
2378 	name = mode_option;
2379 
2380 	/* Locate the start of named options */
2381 	options_ptr = strchr(name, ',');
2382 	if (options_ptr)
2383 		options_off = options_ptr - name;
2384 	else
2385 		options_off = strlen(name);
2386 
2387 	/* Try to locate the bpp and refresh specifiers, if any */
2388 	bpp_ptr = strnchr(name, options_off, '-');
2389 	while (bpp_ptr && !isdigit(bpp_ptr[1]))
2390 		bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2391 	if (bpp_ptr)
2392 		bpp_off = bpp_ptr - name;
2393 
2394 	refresh_ptr = strnchr(name, options_off, '@');
2395 	if (refresh_ptr)
2396 		refresh_off = refresh_ptr - name;
2397 
2398 	/* Locate the end of the name / resolution, and parse it */
2399 	if (bpp_ptr) {
2400 		mode_end = bpp_off;
2401 	} else if (refresh_ptr) {
2402 		mode_end = refresh_off;
2403 	} else if (options_ptr) {
2404 		mode_end = options_off;
2405 		parse_extras = true;
2406 	} else {
2407 		mode_end = strlen(name);
2408 		parse_extras = true;
2409 	}
2410 
2411 	if (!mode_end)
2412 		return false;
2413 
2414 	ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
2415 	if (ret < 0)
2416 		return false;
2417 
2418 	/*
2419 	 * Having a mode that starts by a letter (and thus is named) and
2420 	 * an at-sign (used to specify a refresh rate) is disallowed.
2421 	 */
2422 	if (ret && refresh_ptr)
2423 		return false;
2424 
2425 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2426 	if (!mode->specified && isdigit(name[0])) {
2427 		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
2428 						      parse_extras,
2429 						      connector,
2430 						      mode);
2431 		if (ret)
2432 			return false;
2433 
2434 		mode->specified = true;
2435 	}
2436 
2437 	/* No mode? Check for freestanding extras and/or options */
2438 	if (!mode->specified) {
2439 		unsigned int len = strlen(mode_option);
2440 
2441 		if (bpp_ptr || refresh_ptr)
2442 			return false; /* syntax error */
2443 
2444 		if (len == 1 || (len >= 2 && mode_option[1] == ','))
2445 			extra_ptr = mode_option;
2446 		else
2447 			options_ptr = mode_option - 1;
2448 
2449 		freestanding = true;
2450 	}
2451 
2452 	if (bpp_ptr) {
2453 		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
2454 		if (ret)
2455 			return false;
2456 
2457 		mode->bpp_specified = true;
2458 	}
2459 
2460 	if (refresh_ptr) {
2461 		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
2462 						     &refresh_end_ptr, mode);
2463 		if (ret)
2464 			return false;
2465 
2466 		mode->refresh_specified = true;
2467 	}
2468 
2469 	/*
2470 	 * Locate the end of the bpp / refresh, and parse the extras
2471 	 * if relevant
2472 	 */
2473 	if (bpp_ptr && refresh_ptr)
2474 		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2475 	else if (bpp_ptr)
2476 		extra_ptr = bpp_end_ptr;
2477 	else if (refresh_ptr)
2478 		extra_ptr = refresh_end_ptr;
2479 
2480 	if (extra_ptr) {
2481 		if (options_ptr)
2482 			len = options_ptr - extra_ptr;
2483 		else
2484 			len = strlen(extra_ptr);
2485 
2486 		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
2487 						   connector, mode);
2488 		if (ret)
2489 			return false;
2490 	}
2491 
2492 	if (options_ptr) {
2493 		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
2494 						     freestanding,
2495 						     connector, mode);
2496 		if (ret)
2497 			return false;
2498 	}
2499 
2500 	return true;
2501 }
2502 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2503 
drm_named_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)2504 static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2505 					       struct drm_cmdline_mode *cmd)
2506 {
2507 	unsigned int i;
2508 
2509 	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2510 		const struct drm_named_mode *named_mode = &drm_named_modes[i];
2511 
2512 		if (strcmp(cmd->name, named_mode->name))
2513 			continue;
2514 
2515 		if (!cmd->tv_mode_specified)
2516 			continue;
2517 
2518 		return drm_analog_tv_mode(dev,
2519 					  named_mode->tv_mode,
2520 					  named_mode->pixel_clock_khz * 1000,
2521 					  named_mode->xres,
2522 					  named_mode->yres,
2523 					  named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2524 	}
2525 
2526 	return NULL;
2527 }
2528 
2529 /**
2530  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2531  * @dev: DRM device to create the new mode for
2532  * @cmd: input command line modeline
2533  *
2534  * Returns:
2535  * Pointer to converted mode on success, NULL on error.
2536  */
2537 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)2538 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2539 				  struct drm_cmdline_mode *cmd)
2540 {
2541 	struct drm_display_mode *mode;
2542 
2543 	if (cmd->xres == 0 || cmd->yres == 0)
2544 		return NULL;
2545 
2546 	if (strlen(cmd->name))
2547 		mode = drm_named_mode(dev, cmd);
2548 	else if (cmd->cvt)
2549 		mode = drm_cvt_mode(dev,
2550 				    cmd->xres, cmd->yres,
2551 				    cmd->refresh_specified ? cmd->refresh : 60,
2552 				    cmd->rb, cmd->interlace,
2553 				    cmd->margins);
2554 	else
2555 		mode = drm_gtf_mode(dev,
2556 				    cmd->xres, cmd->yres,
2557 				    cmd->refresh_specified ? cmd->refresh : 60,
2558 				    cmd->interlace,
2559 				    cmd->margins);
2560 	if (!mode)
2561 		return NULL;
2562 
2563 	mode->type |= DRM_MODE_TYPE_USERDEF;
2564 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2565 	if (cmd->xres == 1366)
2566 		drm_mode_fixup_1366x768(mode);
2567 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2568 	return mode;
2569 }
2570 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2571 
2572 /**
2573  * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2574  * @out: drm_mode_modeinfo struct to return to the user
2575  * @in: drm_display_mode to use
2576  *
2577  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2578  * the user.
2579  */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)2580 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2581 			       const struct drm_display_mode *in)
2582 {
2583 	out->clock = in->clock;
2584 	out->hdisplay = in->hdisplay;
2585 	out->hsync_start = in->hsync_start;
2586 	out->hsync_end = in->hsync_end;
2587 	out->htotal = in->htotal;
2588 	out->hskew = in->hskew;
2589 	out->vdisplay = in->vdisplay;
2590 	out->vsync_start = in->vsync_start;
2591 	out->vsync_end = in->vsync_end;
2592 	out->vtotal = in->vtotal;
2593 	out->vscan = in->vscan;
2594 	out->vrefresh = drm_mode_vrefresh(in);
2595 	out->flags = in->flags;
2596 	out->type = in->type;
2597 
2598 	switch (in->picture_aspect_ratio) {
2599 	case HDMI_PICTURE_ASPECT_4_3:
2600 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2601 		break;
2602 	case HDMI_PICTURE_ASPECT_16_9:
2603 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2604 		break;
2605 	case HDMI_PICTURE_ASPECT_64_27:
2606 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2607 		break;
2608 	case HDMI_PICTURE_ASPECT_256_135:
2609 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2610 		break;
2611 	default:
2612 		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2613 		     in->picture_aspect_ratio);
2614 		fallthrough;
2615 	case HDMI_PICTURE_ASPECT_NONE:
2616 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2617 		break;
2618 	}
2619 
2620 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2621 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2622 }
2623 
2624 /**
2625  * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2626  * @dev: drm device
2627  * @out: drm_display_mode to return to the user
2628  * @in: drm_mode_modeinfo to use
2629  *
2630  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2631  * the caller.
2632  *
2633  * Returns:
2634  * Zero on success, negative errno on failure.
2635  */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)2636 int drm_mode_convert_umode(struct drm_device *dev,
2637 			   struct drm_display_mode *out,
2638 			   const struct drm_mode_modeinfo *in)
2639 {
2640 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2641 		return -ERANGE;
2642 
2643 	out->clock = in->clock;
2644 	out->hdisplay = in->hdisplay;
2645 	out->hsync_start = in->hsync_start;
2646 	out->hsync_end = in->hsync_end;
2647 	out->htotal = in->htotal;
2648 	out->hskew = in->hskew;
2649 	out->vdisplay = in->vdisplay;
2650 	out->vsync_start = in->vsync_start;
2651 	out->vsync_end = in->vsync_end;
2652 	out->vtotal = in->vtotal;
2653 	out->vscan = in->vscan;
2654 	out->flags = in->flags;
2655 	/*
2656 	 * Old xf86-video-vmware (possibly others too) used to
2657 	 * leave 'type' uninitialized. Just ignore any bits we
2658 	 * don't like. It's a just hint after all, and more
2659 	 * useful for the kernel->userspace direction anyway.
2660 	 */
2661 	out->type = in->type & DRM_MODE_TYPE_ALL;
2662 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2663 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2664 
2665 	/* Clearing picture aspect ratio bits from out flags,
2666 	 * as the aspect-ratio information is not stored in
2667 	 * flags for kernel-mode, but in picture_aspect_ratio.
2668 	 */
2669 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2670 
2671 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2672 	case DRM_MODE_FLAG_PIC_AR_4_3:
2673 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2674 		break;
2675 	case DRM_MODE_FLAG_PIC_AR_16_9:
2676 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2677 		break;
2678 	case DRM_MODE_FLAG_PIC_AR_64_27:
2679 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2680 		break;
2681 	case DRM_MODE_FLAG_PIC_AR_256_135:
2682 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2683 		break;
2684 	case DRM_MODE_FLAG_PIC_AR_NONE:
2685 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2686 		break;
2687 	default:
2688 		return -EINVAL;
2689 	}
2690 
2691 	out->status = drm_mode_validate_driver(dev, out);
2692 	if (out->status != MODE_OK)
2693 		return -EINVAL;
2694 
2695 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2696 
2697 	return 0;
2698 }
2699 
2700 /**
2701  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2702  * output format
2703  *
2704  * @display: display under action
2705  * @mode: video mode to be tested.
2706  *
2707  * Returns:
2708  * true if the mode can be supported in YCBCR420 format
2709  * false if not.
2710  */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)2711 bool drm_mode_is_420_only(const struct drm_display_info *display,
2712 			  const struct drm_display_mode *mode)
2713 {
2714 	u8 vic = drm_match_cea_mode(mode);
2715 
2716 	return test_bit(vic, display->hdmi.y420_vdb_modes);
2717 }
2718 EXPORT_SYMBOL(drm_mode_is_420_only);
2719 
2720 /**
2721  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2722  * output format also (along with RGB/YCBCR444/422)
2723  *
2724  * @display: display under action.
2725  * @mode: video mode to be tested.
2726  *
2727  * Returns:
2728  * true if the mode can be support YCBCR420 format
2729  * false if not.
2730  */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)2731 bool drm_mode_is_420_also(const struct drm_display_info *display,
2732 			  const struct drm_display_mode *mode)
2733 {
2734 	u8 vic = drm_match_cea_mode(mode);
2735 
2736 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2737 }
2738 EXPORT_SYMBOL(drm_mode_is_420_also);
2739 /**
2740  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2741  * output format
2742  *
2743  * @display: display under action.
2744  * @mode: video mode to be tested.
2745  *
2746  * Returns:
2747  * true if the mode can be supported in YCBCR420 format
2748  * false if not.
2749  */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)2750 bool drm_mode_is_420(const struct drm_display_info *display,
2751 		     const struct drm_display_mode *mode)
2752 {
2753 	return drm_mode_is_420_only(display, mode) ||
2754 		drm_mode_is_420_also(display, mode);
2755 }
2756 EXPORT_SYMBOL(drm_mode_is_420);
2757