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/list.h>
35 #include <linux/list_sort.h>
36 #include <linux/export.h>
37 
38 #include <video/of_display_timing.h>
39 #include <video/of_videomode.h>
40 #include <video/videomode.h>
41 
42 #include <drm/drm_crtc.h>
43 #include <drm/drm_device.h>
44 #include <drm/drm_modes.h>
45 #include <drm/drm_print.h>
46 
47 #include "drm_crtc_internal.h"
48 
49 /**
50  * drm_mode_debug_printmodeline - print a mode to dmesg
51  * @mode: mode to print
52  *
53  * Describe @mode using DRM_DEBUG.
54  */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)55 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
56 {
57 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
58 }
59 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
60 
61 /**
62  * drm_mode_create - create a new display mode
63  * @dev: DRM device
64  *
65  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
66  * and return it.
67  *
68  * Returns:
69  * Pointer to new mode on success, NULL on error.
70  */
drm_mode_create(struct drm_device * dev)71 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
72 {
73 	struct drm_display_mode *nmode;
74 
75 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
76 	if (!nmode)
77 		return NULL;
78 
79 	return nmode;
80 }
81 EXPORT_SYMBOL(drm_mode_create);
82 
83 /**
84  * drm_mode_destroy - remove a mode
85  * @dev: DRM device
86  * @mode: mode to remove
87  *
88  * Release @mode's unique ID, then free it @mode structure itself using kfree.
89  */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)90 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
91 {
92 	if (!mode)
93 		return;
94 
95 	kfree(mode);
96 }
97 EXPORT_SYMBOL(drm_mode_destroy);
98 
99 /**
100  * drm_mode_probed_add - add a mode to a connector's probed_mode list
101  * @connector: connector the new mode
102  * @mode: mode data
103  *
104  * Add @mode to @connector's probed_mode list for later use. This list should
105  * then in a second step get filtered and all the modes actually supported by
106  * the hardware moved to the @connector's modes list.
107  */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)108 void drm_mode_probed_add(struct drm_connector *connector,
109 			 struct drm_display_mode *mode)
110 {
111 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
112 
113 	list_add_tail(&mode->head, &connector->probed_modes);
114 }
115 EXPORT_SYMBOL(drm_mode_probed_add);
116 
117 /**
118  * drm_cvt_mode -create a modeline based on the CVT algorithm
119  * @dev: drm device
120  * @hdisplay: hdisplay size
121  * @vdisplay: vdisplay size
122  * @vrefresh: vrefresh rate
123  * @reduced: whether to use reduced blanking
124  * @interlaced: whether to compute an interlaced mode
125  * @margins: whether to add margins (borders)
126  *
127  * This function is called to generate the modeline based on CVT algorithm
128  * according to the hdisplay, vdisplay, vrefresh.
129  * It is based from the VESA(TM) Coordinated Video Timing Generator by
130  * Graham Loveridge April 9, 2003 available at
131  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
132  *
133  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
134  * What I have done is to translate it by using integer calculation.
135  *
136  * Returns:
137  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
138  * The display mode object is allocated with drm_mode_create(). Returns NULL
139  * when no mode could be allocated.
140  */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)141 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
142 				      int vdisplay, int vrefresh,
143 				      bool reduced, bool interlaced, bool margins)
144 {
145 #define HV_FACTOR			1000
146 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
147 #define	CVT_MARGIN_PERCENTAGE		18
148 	/* 2) character cell horizontal granularity (pixels) - default 8 */
149 #define	CVT_H_GRANULARITY		8
150 	/* 3) Minimum vertical porch (lines) - default 3 */
151 #define	CVT_MIN_V_PORCH			3
152 	/* 4) Minimum number of vertical back porch lines - default 6 */
153 #define	CVT_MIN_V_BPORCH		6
154 	/* Pixel Clock step (kHz) */
155 #define CVT_CLOCK_STEP			250
156 	struct drm_display_mode *drm_mode;
157 	unsigned int vfieldrate, hperiod;
158 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
159 	int interlace;
160 	u64 tmp;
161 
162 	if (!hdisplay || !vdisplay)
163 		return NULL;
164 
165 	/* allocate the drm_display_mode structure. If failure, we will
166 	 * return directly
167 	 */
168 	drm_mode = drm_mode_create(dev);
169 	if (!drm_mode)
170 		return NULL;
171 
172 	/* the CVT default refresh rate is 60Hz */
173 	if (!vrefresh)
174 		vrefresh = 60;
175 
176 	/* the required field fresh rate */
177 	if (interlaced)
178 		vfieldrate = vrefresh * 2;
179 	else
180 		vfieldrate = vrefresh;
181 
182 	/* horizontal pixels */
183 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
184 
185 	/* determine the left&right borders */
186 	hmargin = 0;
187 	if (margins) {
188 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
189 		hmargin -= hmargin % CVT_H_GRANULARITY;
190 	}
191 	/* find the total active pixels */
192 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
193 
194 	/* find the number of lines per field */
195 	if (interlaced)
196 		vdisplay_rnd = vdisplay / 2;
197 	else
198 		vdisplay_rnd = vdisplay;
199 
200 	/* find the top & bottom borders */
201 	vmargin = 0;
202 	if (margins)
203 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
204 
205 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
206 
207 	/* Interlaced */
208 	if (interlaced)
209 		interlace = 1;
210 	else
211 		interlace = 0;
212 
213 	/* Determine VSync Width from aspect ratio */
214 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
215 		vsync = 4;
216 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
217 		vsync = 5;
218 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
219 		vsync = 6;
220 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
221 		vsync = 7;
222 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
223 		vsync = 7;
224 	else /* custom */
225 		vsync = 10;
226 
227 	if (!reduced) {
228 		/* simplify the GTF calculation */
229 		/* 4) Minimum time of vertical sync + back porch interval (µs)
230 		 * default 550.0
231 		 */
232 		int tmp1, tmp2;
233 #define CVT_MIN_VSYNC_BP	550
234 		/* 3) Nominal HSync width (% of line period) - default 8 */
235 #define CVT_HSYNC_PERCENTAGE	8
236 		unsigned int hblank_percentage;
237 		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
238 
239 		/* estimated the horizontal period */
240 		tmp1 = HV_FACTOR * 1000000  -
241 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
242 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
243 				interlace;
244 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
245 
246 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
247 		/* 9. Find number of lines in sync + backporch */
248 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
249 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
250 		else
251 			vsyncandback_porch = tmp1;
252 		/* 10. Find number of lines in back porch */
253 		vback_porch = vsyncandback_porch - vsync;
254 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
255 				vsyncandback_porch + CVT_MIN_V_PORCH;
256 		/* 5) Definition of Horizontal blanking time limitation */
257 		/* Gradient (%/kHz) - default 600 */
258 #define CVT_M_FACTOR	600
259 		/* Offset (%) - default 40 */
260 #define CVT_C_FACTOR	40
261 		/* Blanking time scaling factor - default 128 */
262 #define CVT_K_FACTOR	128
263 		/* Scaling factor weighting - default 20 */
264 #define CVT_J_FACTOR	20
265 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
266 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
267 			 CVT_J_FACTOR)
268 		/* 12. Find ideal blanking duty cycle from formula */
269 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
270 					hperiod / 1000;
271 		/* 13. Blanking time */
272 		if (hblank_percentage < 20 * HV_FACTOR)
273 			hblank_percentage = 20 * HV_FACTOR;
274 		hblank = drm_mode->hdisplay * hblank_percentage /
275 			 (100 * HV_FACTOR - hblank_percentage);
276 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
277 		/* 14. find the total pixels per line */
278 		drm_mode->htotal = drm_mode->hdisplay + hblank;
279 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
280 		drm_mode->hsync_start = drm_mode->hsync_end -
281 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
282 		drm_mode->hsync_start += CVT_H_GRANULARITY -
283 			drm_mode->hsync_start % CVT_H_GRANULARITY;
284 		/* fill the Vsync values */
285 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
286 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
287 	} else {
288 		/* Reduced blanking */
289 		/* Minimum vertical blanking interval time (µs)- default 460 */
290 #define CVT_RB_MIN_VBLANK	460
291 		/* Fixed number of clocks for horizontal sync */
292 #define CVT_RB_H_SYNC		32
293 		/* Fixed number of clocks for horizontal blanking */
294 #define CVT_RB_H_BLANK		160
295 		/* Fixed number of lines for vertical front porch - default 3*/
296 #define CVT_RB_VFPORCH		3
297 		int vbilines;
298 		int tmp1, tmp2;
299 		/* 8. Estimate Horizontal period. */
300 		tmp1 = HV_FACTOR * 1000000 -
301 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
302 		tmp2 = vdisplay_rnd + 2 * vmargin;
303 		hperiod = tmp1 / (tmp2 * vfieldrate);
304 		/* 9. Find number of lines in vertical blanking */
305 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
306 		/* 10. Check if vertical blanking is sufficient */
307 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
308 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
309 		/* 11. Find total number of lines in vertical field */
310 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
311 		/* 12. Find total number of pixels in a line */
312 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
313 		/* Fill in HSync values */
314 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
315 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
316 		/* Fill in VSync values */
317 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
318 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
319 	}
320 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
321 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
322 	tmp *= HV_FACTOR * 1000;
323 	do_div(tmp, hperiod);
324 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
325 	drm_mode->clock = tmp;
326 	/* 18/16. Find actual vertical frame frequency */
327 	/* ignore - just set the mode flag for interlaced */
328 	if (interlaced) {
329 		drm_mode->vtotal *= 2;
330 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
331 	}
332 	/* Fill the mode line name */
333 	drm_mode_set_name(drm_mode);
334 	if (reduced)
335 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
336 					DRM_MODE_FLAG_NVSYNC);
337 	else
338 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
339 					DRM_MODE_FLAG_NHSYNC);
340 
341 	return drm_mode;
342 }
343 EXPORT_SYMBOL(drm_cvt_mode);
344 
345 /**
346  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
347  * @dev: drm device
348  * @hdisplay: hdisplay size
349  * @vdisplay: vdisplay size
350  * @vrefresh: vrefresh rate.
351  * @interlaced: whether to compute an interlaced mode
352  * @margins: desired margin (borders) size
353  * @GTF_M: extended GTF formula parameters
354  * @GTF_2C: extended GTF formula parameters
355  * @GTF_K: extended GTF formula parameters
356  * @GTF_2J: extended GTF formula parameters
357  *
358  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
359  * in here multiplied by two.  For a C of 40, pass in 80.
360  *
361  * Returns:
362  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
363  * The display mode object is allocated with drm_mode_create(). Returns NULL
364  * when no mode could be allocated.
365  */
366 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)367 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
368 		     int vrefresh, bool interlaced, int margins,
369 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
370 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
371 #define	GTF_MARGIN_PERCENTAGE		18
372 	/* 2) character cell horizontal granularity (pixels) - default 8 */
373 #define	GTF_CELL_GRAN			8
374 	/* 3) Minimum vertical porch (lines) - default 3 */
375 #define	GTF_MIN_V_PORCH			1
376 	/* width of vsync in lines */
377 #define V_SYNC_RQD			3
378 	/* width of hsync as % of total line */
379 #define H_SYNC_PERCENT			8
380 	/* min time of vsync + back porch (microsec) */
381 #define MIN_VSYNC_PLUS_BP		550
382 	/* C' and M' are part of the Blanking Duty Cycle computation */
383 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
384 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
385 	struct drm_display_mode *drm_mode;
386 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
387 	int top_margin, bottom_margin;
388 	int interlace;
389 	unsigned int hfreq_est;
390 	int vsync_plus_bp, __maybe_unused vback_porch;
391 	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
392 	unsigned int __maybe_unused hperiod;
393 	unsigned int vfield_rate, __maybe_unused vframe_rate;
394 	int left_margin, right_margin;
395 	unsigned int total_active_pixels, ideal_duty_cycle;
396 	unsigned int hblank, total_pixels, pixel_freq;
397 	int hsync, hfront_porch, vodd_front_porch_lines;
398 	unsigned int tmp1, tmp2;
399 
400 	if (!hdisplay || !vdisplay)
401 		return NULL;
402 
403 	drm_mode = drm_mode_create(dev);
404 	if (!drm_mode)
405 		return NULL;
406 
407 	/* 1. In order to give correct results, the number of horizontal
408 	 * pixels requested is first processed to ensure that it is divisible
409 	 * by the character size, by rounding it to the nearest character
410 	 * cell boundary:
411 	 */
412 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
413 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
414 
415 	/* 2. If interlace is requested, the number of vertical lines assumed
416 	 * by the calculation must be halved, as the computation calculates
417 	 * the number of vertical lines per field.
418 	 */
419 	if (interlaced)
420 		vdisplay_rnd = vdisplay / 2;
421 	else
422 		vdisplay_rnd = vdisplay;
423 
424 	/* 3. Find the frame rate required: */
425 	if (interlaced)
426 		vfieldrate_rqd = vrefresh * 2;
427 	else
428 		vfieldrate_rqd = vrefresh;
429 
430 	/* 4. Find number of lines in Top margin: */
431 	top_margin = 0;
432 	if (margins)
433 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
434 				1000;
435 	/* 5. Find number of lines in bottom margin: */
436 	bottom_margin = top_margin;
437 
438 	/* 6. If interlace is required, then set variable interlace: */
439 	if (interlaced)
440 		interlace = 1;
441 	else
442 		interlace = 0;
443 
444 	/* 7. Estimate the Horizontal frequency */
445 	{
446 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
447 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
448 				2 + interlace;
449 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
450 	}
451 
452 	/* 8. Find the number of lines in V sync + back porch */
453 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
454 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
455 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
456 	/*  9. Find the number of lines in V back porch alone: */
457 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
458 	/*  10. Find the total number of lines in Vertical field period: */
459 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
460 			vsync_plus_bp + GTF_MIN_V_PORCH;
461 	/*  11. Estimate the Vertical field frequency: */
462 	vfieldrate_est = hfreq_est / vtotal_lines;
463 	/*  12. Find the actual horizontal period: */
464 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
465 
466 	/*  13. Find the actual Vertical field frequency: */
467 	vfield_rate = hfreq_est / vtotal_lines;
468 	/*  14. Find the Vertical frame frequency: */
469 	if (interlaced)
470 		vframe_rate = vfield_rate / 2;
471 	else
472 		vframe_rate = vfield_rate;
473 	/*  15. Find number of pixels in left margin: */
474 	if (margins)
475 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
476 				1000;
477 	else
478 		left_margin = 0;
479 
480 	/* 16.Find number of pixels in right margin: */
481 	right_margin = left_margin;
482 	/* 17.Find total number of active pixels in image and left and right */
483 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
484 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
485 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
486 				(GTF_M_PRIME * 1000000 / hfreq_est);
487 	/* 19.Find the number of pixels in the blanking time to the nearest
488 	 * double character cell: */
489 	hblank = total_active_pixels * ideal_duty_cycle /
490 			(100000 - ideal_duty_cycle);
491 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
492 	hblank = hblank * 2 * GTF_CELL_GRAN;
493 	/* 20.Find total number of pixels: */
494 	total_pixels = total_active_pixels + hblank;
495 	/* 21.Find pixel clock frequency: */
496 	pixel_freq = total_pixels * hfreq_est / 1000;
497 	/* Stage 1 computations are now complete; I should really pass
498 	 * the results to another function and do the Stage 2 computations,
499 	 * but I only need a few more values so I'll just append the
500 	 * computations here for now */
501 	/* 17. Find the number of pixels in the horizontal sync period: */
502 	hsync = H_SYNC_PERCENT * total_pixels / 100;
503 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
504 	hsync = hsync * GTF_CELL_GRAN;
505 	/* 18. Find the number of pixels in horizontal front porch period */
506 	hfront_porch = hblank / 2 - hsync;
507 	/*  36. Find the number of lines in the odd front porch period: */
508 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
509 
510 	/* finally, pack the results in the mode struct */
511 	drm_mode->hdisplay = hdisplay_rnd;
512 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
513 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
514 	drm_mode->htotal = total_pixels;
515 	drm_mode->vdisplay = vdisplay_rnd;
516 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
517 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
518 	drm_mode->vtotal = vtotal_lines;
519 
520 	drm_mode->clock = pixel_freq;
521 
522 	if (interlaced) {
523 		drm_mode->vtotal *= 2;
524 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
525 	}
526 
527 	drm_mode_set_name(drm_mode);
528 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
529 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
530 	else
531 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
532 
533 	return drm_mode;
534 }
535 EXPORT_SYMBOL(drm_gtf_mode_complex);
536 
537 /**
538  * drm_gtf_mode - create the modeline based on the GTF algorithm
539  * @dev: drm device
540  * @hdisplay: hdisplay size
541  * @vdisplay: vdisplay size
542  * @vrefresh: vrefresh rate.
543  * @interlaced: whether to compute an interlaced mode
544  * @margins: desired margin (borders) size
545  *
546  * return the modeline based on GTF algorithm
547  *
548  * This function is to create the modeline based on the GTF algorithm.
549  * Generalized Timing Formula is derived from:
550  *
551  *	GTF Spreadsheet by Andy Morrish (1/5/97)
552  *	available at https://www.vesa.org
553  *
554  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
555  * What I have done is to translate it by using integer calculation.
556  * I also refer to the function of fb_get_mode in the file of
557  * drivers/video/fbmon.c
558  *
559  * Standard GTF parameters::
560  *
561  *     M = 600
562  *     C = 40
563  *     K = 128
564  *     J = 20
565  *
566  * Returns:
567  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
568  * The display mode object is allocated with drm_mode_create(). Returns NULL
569  * when no mode could be allocated.
570  */
571 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)572 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
573 	     bool interlaced, int margins)
574 {
575 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
576 				    interlaced, margins,
577 				    600, 40 * 2, 128, 20 * 2);
578 }
579 EXPORT_SYMBOL(drm_gtf_mode);
580 
581 #ifdef CONFIG_VIDEOMODE_HELPERS
582 /**
583  * drm_display_mode_from_videomode - fill in @dmode using @vm,
584  * @vm: videomode structure to use as source
585  * @dmode: drm_display_mode structure to use as destination
586  *
587  * Fills out @dmode using the display mode specified in @vm.
588  */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)589 void drm_display_mode_from_videomode(const struct videomode *vm,
590 				     struct drm_display_mode *dmode)
591 {
592 	dmode->hdisplay = vm->hactive;
593 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
594 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
595 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
596 
597 	dmode->vdisplay = vm->vactive;
598 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
599 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
600 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
601 
602 	dmode->clock = vm->pixelclock / 1000;
603 
604 	dmode->flags = 0;
605 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
606 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
607 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
608 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
609 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
610 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
611 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
612 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
613 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
614 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
615 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
616 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
617 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
618 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
619 	drm_mode_set_name(dmode);
620 }
621 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
622 
623 /**
624  * drm_display_mode_to_videomode - fill in @vm using @dmode,
625  * @dmode: drm_display_mode structure to use as source
626  * @vm: videomode structure to use as destination
627  *
628  * Fills out @vm using the display mode specified in @dmode.
629  */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)630 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
631 				   struct videomode *vm)
632 {
633 	vm->hactive = dmode->hdisplay;
634 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
635 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
636 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
637 
638 	vm->vactive = dmode->vdisplay;
639 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
640 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
641 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
642 
643 	vm->pixelclock = dmode->clock * 1000;
644 
645 	vm->flags = 0;
646 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
647 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
648 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
649 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
650 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
651 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
652 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
653 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
654 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
655 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
656 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
657 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
658 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
659 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
660 }
661 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
662 
663 /**
664  * drm_bus_flags_from_videomode - extract information about pixelclk and
665  * DE polarity from videomode and store it in a separate variable
666  * @vm: videomode structure to use
667  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
668  * here
669  *
670  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
671  * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
672  * found in @vm
673  */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)674 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
675 {
676 	*bus_flags = 0;
677 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
678 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
679 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
680 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
681 
682 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
683 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
684 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
685 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
686 
687 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
688 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
689 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
690 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
691 }
692 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
693 
694 #ifdef CONFIG_OF
695 /**
696  * of_get_drm_display_mode - get a drm_display_mode from devicetree
697  * @np: device_node with the timing specification
698  * @dmode: will be set to the return value
699  * @bus_flags: information about pixelclk, sync and DE polarity
700  * @index: index into the list of display timings in devicetree
701  *
702  * This function is expensive and should only be used, if only one mode is to be
703  * read from DT. To get multiple modes start with of_get_display_timings and
704  * work with that instead.
705  *
706  * Returns:
707  * 0 on success, a negative errno code when no of videomode node was found.
708  */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)709 int of_get_drm_display_mode(struct device_node *np,
710 			    struct drm_display_mode *dmode, u32 *bus_flags,
711 			    int index)
712 {
713 	struct videomode vm;
714 	int ret;
715 
716 	ret = of_get_videomode(np, &vm, index);
717 	if (ret)
718 		return ret;
719 
720 	drm_display_mode_from_videomode(&vm, dmode);
721 	if (bus_flags)
722 		drm_bus_flags_from_videomode(&vm, bus_flags);
723 
724 	pr_debug("%pOF: got %dx%d display mode\n",
725 		np, vm.hactive, vm.vactive);
726 	drm_mode_debug_printmodeline(dmode);
727 
728 	return 0;
729 }
730 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
731 
732 /**
733  * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
734  * @np: device_node with the panel-timing specification
735  * @dmode: will be set to the return value
736  * @bus_flags: information about pixelclk, sync and DE polarity
737  *
738  * The mandatory Device Tree properties width-mm and height-mm
739  * are read and set on the display mode.
740  *
741  * Returns:
742  * Zero on success, negative error code on failure.
743  */
of_get_drm_panel_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags)744 int of_get_drm_panel_display_mode(struct device_node *np,
745 				  struct drm_display_mode *dmode, u32 *bus_flags)
746 {
747 	u32 width_mm = 0, height_mm = 0;
748 	struct display_timing timing;
749 	struct videomode vm;
750 	int ret;
751 
752 	ret = of_get_display_timing(np, "panel-timing", &timing);
753 	if (ret)
754 		return ret;
755 
756 	videomode_from_timing(&timing, &vm);
757 
758 	memset(dmode, 0, sizeof(*dmode));
759 	drm_display_mode_from_videomode(&vm, dmode);
760 	if (bus_flags)
761 		drm_bus_flags_from_videomode(&vm, bus_flags);
762 
763 	ret = of_property_read_u32(np, "width-mm", &width_mm);
764 	if (ret)
765 		return ret;
766 
767 	ret = of_property_read_u32(np, "height-mm", &height_mm);
768 	if (ret)
769 		return ret;
770 
771 	dmode->width_mm = width_mm;
772 	dmode->height_mm = height_mm;
773 
774 	drm_mode_debug_printmodeline(dmode);
775 
776 	return 0;
777 }
778 EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
779 #endif /* CONFIG_OF */
780 #endif /* CONFIG_VIDEOMODE_HELPERS */
781 
782 /**
783  * drm_mode_set_name - set the name on a mode
784  * @mode: name will be set in this mode
785  *
786  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
787  * with an optional 'i' suffix for interlaced modes.
788  */
drm_mode_set_name(struct drm_display_mode * mode)789 void drm_mode_set_name(struct drm_display_mode *mode)
790 {
791 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
792 
793 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
794 		 mode->hdisplay, mode->vdisplay,
795 		 interlaced ? "i" : "");
796 }
797 EXPORT_SYMBOL(drm_mode_set_name);
798 
799 /**
800  * drm_mode_vrefresh - get the vrefresh of a mode
801  * @mode: mode
802  *
803  * Returns:
804  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
805  * value first if it is not yet set.
806  */
drm_mode_vrefresh(const struct drm_display_mode * mode)807 int drm_mode_vrefresh(const struct drm_display_mode *mode)
808 {
809 	unsigned int num, den;
810 
811 	if (mode->htotal == 0 || mode->vtotal == 0)
812 		return 0;
813 
814 	num = mode->clock;
815 	den = mode->htotal * mode->vtotal;
816 
817 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
818 		num *= 2;
819 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
820 		den *= 2;
821 	if (mode->vscan > 1)
822 		den *= mode->vscan;
823 
824 	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
825 }
826 EXPORT_SYMBOL(drm_mode_vrefresh);
827 
828 /**
829  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
830  * @mode: mode to query
831  * @hdisplay: hdisplay value to fill in
832  * @vdisplay: vdisplay value to fill in
833  *
834  * The vdisplay value will be doubled if the specified mode is a stereo mode of
835  * the appropriate layout.
836  */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)837 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
838 			    int *hdisplay, int *vdisplay)
839 {
840 	struct drm_display_mode adjusted;
841 
842 	drm_mode_init(&adjusted, mode);
843 
844 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
845 	*hdisplay = adjusted.crtc_hdisplay;
846 	*vdisplay = adjusted.crtc_vdisplay;
847 }
848 EXPORT_SYMBOL(drm_mode_get_hv_timing);
849 
850 /**
851  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
852  * @p: mode
853  * @adjust_flags: a combination of adjustment flags
854  *
855  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
856  *
857  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
858  *   interlaced modes.
859  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
860  *   buffers containing two eyes (only adjust the timings when needed, eg. for
861  *   "frame packing" or "side by side full").
862  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
863  *   be performed for doublescan and vscan > 1 modes respectively.
864  */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)865 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
866 {
867 	if (!p)
868 		return;
869 
870 	p->crtc_clock = p->clock;
871 	p->crtc_hdisplay = p->hdisplay;
872 	p->crtc_hsync_start = p->hsync_start;
873 	p->crtc_hsync_end = p->hsync_end;
874 	p->crtc_htotal = p->htotal;
875 	p->crtc_hskew = p->hskew;
876 	p->crtc_vdisplay = p->vdisplay;
877 	p->crtc_vsync_start = p->vsync_start;
878 	p->crtc_vsync_end = p->vsync_end;
879 	p->crtc_vtotal = p->vtotal;
880 
881 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
882 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
883 			p->crtc_vdisplay /= 2;
884 			p->crtc_vsync_start /= 2;
885 			p->crtc_vsync_end /= 2;
886 			p->crtc_vtotal /= 2;
887 		}
888 	}
889 
890 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
891 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
892 			p->crtc_vdisplay *= 2;
893 			p->crtc_vsync_start *= 2;
894 			p->crtc_vsync_end *= 2;
895 			p->crtc_vtotal *= 2;
896 		}
897 	}
898 
899 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
900 		if (p->vscan > 1) {
901 			p->crtc_vdisplay *= p->vscan;
902 			p->crtc_vsync_start *= p->vscan;
903 			p->crtc_vsync_end *= p->vscan;
904 			p->crtc_vtotal *= p->vscan;
905 		}
906 	}
907 
908 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
909 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
910 
911 		switch (layout) {
912 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
913 			p->crtc_clock *= 2;
914 			p->crtc_vdisplay += p->crtc_vtotal;
915 			p->crtc_vsync_start += p->crtc_vtotal;
916 			p->crtc_vsync_end += p->crtc_vtotal;
917 			p->crtc_vtotal += p->crtc_vtotal;
918 			break;
919 		}
920 	}
921 
922 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
923 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
924 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
925 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
926 }
927 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
928 
929 /**
930  * drm_mode_copy - copy the mode
931  * @dst: mode to overwrite
932  * @src: mode to copy
933  *
934  * Copy an existing mode into another mode, preserving the
935  * list head of the destination mode.
936  */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)937 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
938 {
939 	struct list_head head = dst->head;
940 
941 	*dst = *src;
942 	dst->head = head;
943 }
944 EXPORT_SYMBOL(drm_mode_copy);
945 
946 /**
947  * drm_mode_init - initialize the mode from another mode
948  * @dst: mode to overwrite
949  * @src: mode to copy
950  *
951  * Copy an existing mode into another mode, zeroing the
952  * list head of the destination mode. Typically used
953  * to guarantee the list head is not left with stack
954  * garbage in on-stack modes.
955  */
drm_mode_init(struct drm_display_mode * dst,const struct drm_display_mode * src)956 void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
957 {
958 	memset(dst, 0, sizeof(*dst));
959 	drm_mode_copy(dst, src);
960 }
961 EXPORT_SYMBOL(drm_mode_init);
962 
963 /**
964  * drm_mode_duplicate - allocate and duplicate an existing mode
965  * @dev: drm_device to allocate the duplicated mode for
966  * @mode: mode to duplicate
967  *
968  * Just allocate a new mode, copy the existing mode into it, and return
969  * a pointer to it.  Used to create new instances of established modes.
970  *
971  * Returns:
972  * Pointer to duplicated mode on success, NULL on error.
973  */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)974 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
975 					    const struct drm_display_mode *mode)
976 {
977 	struct drm_display_mode *nmode;
978 
979 	nmode = drm_mode_create(dev);
980 	if (!nmode)
981 		return NULL;
982 
983 	drm_mode_copy(nmode, mode);
984 
985 	return nmode;
986 }
987 EXPORT_SYMBOL(drm_mode_duplicate);
988 
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)989 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
990 				   const struct drm_display_mode *mode2)
991 {
992 	return mode1->hdisplay == mode2->hdisplay &&
993 		mode1->hsync_start == mode2->hsync_start &&
994 		mode1->hsync_end == mode2->hsync_end &&
995 		mode1->htotal == mode2->htotal &&
996 		mode1->hskew == mode2->hskew &&
997 		mode1->vdisplay == mode2->vdisplay &&
998 		mode1->vsync_start == mode2->vsync_start &&
999 		mode1->vsync_end == mode2->vsync_end &&
1000 		mode1->vtotal == mode2->vtotal &&
1001 		mode1->vscan == mode2->vscan;
1002 }
1003 
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1004 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1005 				  const struct drm_display_mode *mode2)
1006 {
1007 	/*
1008 	 * do clock check convert to PICOS
1009 	 * so fb modes get matched the same
1010 	 */
1011 	if (mode1->clock && mode2->clock)
1012 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1013 	else
1014 		return mode1->clock == mode2->clock;
1015 }
1016 
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1017 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1018 				 const struct drm_display_mode *mode2)
1019 {
1020 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1021 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1022 }
1023 
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1024 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1025 				    const struct drm_display_mode *mode2)
1026 {
1027 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1028 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
1029 }
1030 
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1031 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1032 					const struct drm_display_mode *mode2)
1033 {
1034 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1035 }
1036 
1037 /**
1038  * drm_mode_match - test modes for (partial) equality
1039  * @mode1: first mode
1040  * @mode2: second mode
1041  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1042  *
1043  * Check to see if @mode1 and @mode2 are equivalent.
1044  *
1045  * Returns:
1046  * True if the modes are (partially) equal, false otherwise.
1047  */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1048 bool drm_mode_match(const struct drm_display_mode *mode1,
1049 		    const struct drm_display_mode *mode2,
1050 		    unsigned int match_flags)
1051 {
1052 	if (!mode1 && !mode2)
1053 		return true;
1054 
1055 	if (!mode1 || !mode2)
1056 		return false;
1057 
1058 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1059 	    !drm_mode_match_timings(mode1, mode2))
1060 		return false;
1061 
1062 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1063 	    !drm_mode_match_clock(mode1, mode2))
1064 		return false;
1065 
1066 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1067 	    !drm_mode_match_flags(mode1, mode2))
1068 		return false;
1069 
1070 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1071 	    !drm_mode_match_3d_flags(mode1, mode2))
1072 		return false;
1073 
1074 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1075 	    !drm_mode_match_aspect_ratio(mode1, mode2))
1076 		return false;
1077 
1078 	return true;
1079 }
1080 EXPORT_SYMBOL(drm_mode_match);
1081 
1082 /**
1083  * drm_mode_equal - test modes for equality
1084  * @mode1: first mode
1085  * @mode2: second mode
1086  *
1087  * Check to see if @mode1 and @mode2 are equivalent.
1088  *
1089  * Returns:
1090  * True if the modes are equal, false otherwise.
1091  */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1092 bool drm_mode_equal(const struct drm_display_mode *mode1,
1093 		    const struct drm_display_mode *mode2)
1094 {
1095 	return drm_mode_match(mode1, mode2,
1096 			      DRM_MODE_MATCH_TIMINGS |
1097 			      DRM_MODE_MATCH_CLOCK |
1098 			      DRM_MODE_MATCH_FLAGS |
1099 			      DRM_MODE_MATCH_3D_FLAGS|
1100 			      DRM_MODE_MATCH_ASPECT_RATIO);
1101 }
1102 EXPORT_SYMBOL(drm_mode_equal);
1103 
1104 /**
1105  * drm_mode_equal_no_clocks - test modes for equality
1106  * @mode1: first mode
1107  * @mode2: second mode
1108  *
1109  * Check to see if @mode1 and @mode2 are equivalent, but
1110  * don't check the pixel clocks.
1111  *
1112  * Returns:
1113  * True if the modes are equal, false otherwise.
1114  */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1115 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1116 			      const struct drm_display_mode *mode2)
1117 {
1118 	return drm_mode_match(mode1, mode2,
1119 			      DRM_MODE_MATCH_TIMINGS |
1120 			      DRM_MODE_MATCH_FLAGS |
1121 			      DRM_MODE_MATCH_3D_FLAGS);
1122 }
1123 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1124 
1125 /**
1126  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1127  * @mode1: first mode
1128  * @mode2: second mode
1129  *
1130  * Check to see if @mode1 and @mode2 are equivalent, but
1131  * don't check the pixel clocks nor the stereo layout.
1132  *
1133  * Returns:
1134  * True if the modes are equal, false otherwise.
1135  */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1136 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1137 					const struct drm_display_mode *mode2)
1138 {
1139 	return drm_mode_match(mode1, mode2,
1140 			      DRM_MODE_MATCH_TIMINGS |
1141 			      DRM_MODE_MATCH_FLAGS);
1142 }
1143 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1144 
1145 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1146 drm_mode_validate_basic(const struct drm_display_mode *mode)
1147 {
1148 	if (mode->type & ~DRM_MODE_TYPE_ALL)
1149 		return MODE_BAD;
1150 
1151 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1152 		return MODE_BAD;
1153 
1154 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1155 		return MODE_BAD;
1156 
1157 	if (mode->clock == 0)
1158 		return MODE_CLOCK_LOW;
1159 
1160 	if (mode->hdisplay == 0 ||
1161 	    mode->hsync_start < mode->hdisplay ||
1162 	    mode->hsync_end < mode->hsync_start ||
1163 	    mode->htotal < mode->hsync_end)
1164 		return MODE_H_ILLEGAL;
1165 
1166 	if (mode->vdisplay == 0 ||
1167 	    mode->vsync_start < mode->vdisplay ||
1168 	    mode->vsync_end < mode->vsync_start ||
1169 	    mode->vtotal < mode->vsync_end)
1170 		return MODE_V_ILLEGAL;
1171 
1172 	return MODE_OK;
1173 }
1174 
1175 /**
1176  * drm_mode_validate_driver - make sure the mode is somewhat sane
1177  * @dev: drm device
1178  * @mode: mode to check
1179  *
1180  * First do basic validation on the mode, and then allow the driver
1181  * to check for device/driver specific limitations via the optional
1182  * &drm_mode_config_helper_funcs.mode_valid hook.
1183  *
1184  * Returns:
1185  * The mode status
1186  */
1187 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1188 drm_mode_validate_driver(struct drm_device *dev,
1189 			const struct drm_display_mode *mode)
1190 {
1191 	enum drm_mode_status status;
1192 
1193 	status = drm_mode_validate_basic(mode);
1194 	if (status != MODE_OK)
1195 		return status;
1196 
1197 	if (dev->mode_config.funcs->mode_valid)
1198 		return dev->mode_config.funcs->mode_valid(dev, mode);
1199 	else
1200 		return MODE_OK;
1201 }
1202 EXPORT_SYMBOL(drm_mode_validate_driver);
1203 
1204 /**
1205  * drm_mode_validate_size - make sure modes adhere to size constraints
1206  * @mode: mode to check
1207  * @maxX: maximum width
1208  * @maxY: maximum height
1209  *
1210  * This function is a helper which can be used to validate modes against size
1211  * limitations of the DRM device/connector. If a mode is too big its status
1212  * member is updated with the appropriate validation failure code. The list
1213  * itself is not changed.
1214  *
1215  * Returns:
1216  * The mode status
1217  */
1218 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1219 drm_mode_validate_size(const struct drm_display_mode *mode,
1220 		       int maxX, int maxY)
1221 {
1222 	if (maxX > 0 && mode->hdisplay > maxX)
1223 		return MODE_VIRTUAL_X;
1224 
1225 	if (maxY > 0 && mode->vdisplay > maxY)
1226 		return MODE_VIRTUAL_Y;
1227 
1228 	return MODE_OK;
1229 }
1230 EXPORT_SYMBOL(drm_mode_validate_size);
1231 
1232 /**
1233  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1234  * @mode: mode to check
1235  * @connector: drm connector under action
1236  *
1237  * This function is a helper which can be used to filter out any YCBCR420
1238  * only mode, when the source doesn't support it.
1239  *
1240  * Returns:
1241  * The mode status
1242  */
1243 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1244 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1245 			   struct drm_connector *connector)
1246 {
1247 	if (!connector->ycbcr_420_allowed &&
1248 	    drm_mode_is_420_only(&connector->display_info, mode))
1249 		return MODE_NO_420;
1250 
1251 	return MODE_OK;
1252 }
1253 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1254 
1255 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1256 
1257 static const char * const drm_mode_status_names[] = {
1258 	MODE_STATUS(OK),
1259 	MODE_STATUS(HSYNC),
1260 	MODE_STATUS(VSYNC),
1261 	MODE_STATUS(H_ILLEGAL),
1262 	MODE_STATUS(V_ILLEGAL),
1263 	MODE_STATUS(BAD_WIDTH),
1264 	MODE_STATUS(NOMODE),
1265 	MODE_STATUS(NO_INTERLACE),
1266 	MODE_STATUS(NO_DBLESCAN),
1267 	MODE_STATUS(NO_VSCAN),
1268 	MODE_STATUS(MEM),
1269 	MODE_STATUS(VIRTUAL_X),
1270 	MODE_STATUS(VIRTUAL_Y),
1271 	MODE_STATUS(MEM_VIRT),
1272 	MODE_STATUS(NOCLOCK),
1273 	MODE_STATUS(CLOCK_HIGH),
1274 	MODE_STATUS(CLOCK_LOW),
1275 	MODE_STATUS(CLOCK_RANGE),
1276 	MODE_STATUS(BAD_HVALUE),
1277 	MODE_STATUS(BAD_VVALUE),
1278 	MODE_STATUS(BAD_VSCAN),
1279 	MODE_STATUS(HSYNC_NARROW),
1280 	MODE_STATUS(HSYNC_WIDE),
1281 	MODE_STATUS(HBLANK_NARROW),
1282 	MODE_STATUS(HBLANK_WIDE),
1283 	MODE_STATUS(VSYNC_NARROW),
1284 	MODE_STATUS(VSYNC_WIDE),
1285 	MODE_STATUS(VBLANK_NARROW),
1286 	MODE_STATUS(VBLANK_WIDE),
1287 	MODE_STATUS(PANEL),
1288 	MODE_STATUS(INTERLACE_WIDTH),
1289 	MODE_STATUS(ONE_WIDTH),
1290 	MODE_STATUS(ONE_HEIGHT),
1291 	MODE_STATUS(ONE_SIZE),
1292 	MODE_STATUS(NO_REDUCED),
1293 	MODE_STATUS(NO_STEREO),
1294 	MODE_STATUS(NO_420),
1295 	MODE_STATUS(STALE),
1296 	MODE_STATUS(BAD),
1297 	MODE_STATUS(ERROR),
1298 };
1299 
1300 #undef MODE_STATUS
1301 
drm_get_mode_status_name(enum drm_mode_status status)1302 const char *drm_get_mode_status_name(enum drm_mode_status status)
1303 {
1304 	int index = status + 3;
1305 
1306 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1307 		return "";
1308 
1309 	return drm_mode_status_names[index];
1310 }
1311 
1312 /**
1313  * drm_mode_prune_invalid - remove invalid modes from mode list
1314  * @dev: DRM device
1315  * @mode_list: list of modes to check
1316  * @verbose: be verbose about it
1317  *
1318  * This helper function can be used to prune a display mode list after
1319  * validation has been completed. All modes whose status is not MODE_OK will be
1320  * removed from the list, and if @verbose the status code and mode name is also
1321  * printed to dmesg.
1322  */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1323 void drm_mode_prune_invalid(struct drm_device *dev,
1324 			    struct list_head *mode_list, bool verbose)
1325 {
1326 	struct drm_display_mode *mode, *t;
1327 
1328 	list_for_each_entry_safe(mode, t, mode_list, head) {
1329 		if (mode->status != MODE_OK) {
1330 			list_del(&mode->head);
1331 			if (verbose) {
1332 				drm_mode_debug_printmodeline(mode);
1333 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1334 					      mode->name,
1335 					      drm_get_mode_status_name(mode->status));
1336 			}
1337 			drm_mode_destroy(dev, mode);
1338 		}
1339 	}
1340 }
1341 EXPORT_SYMBOL(drm_mode_prune_invalid);
1342 
1343 /**
1344  * drm_mode_compare - compare modes for favorability
1345  * @priv: unused
1346  * @lh_a: list_head for first mode
1347  * @lh_b: list_head for second mode
1348  *
1349  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1350  * which is better.
1351  *
1352  * Returns:
1353  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1354  * positive if @lh_b is better than @lh_a.
1355  */
drm_mode_compare(void * priv,const struct list_head * lh_a,const struct list_head * lh_b)1356 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1357 			    const struct list_head *lh_b)
1358 {
1359 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1360 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1361 	int diff;
1362 
1363 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1364 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1365 	if (diff)
1366 		return diff;
1367 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1368 	if (diff)
1369 		return diff;
1370 
1371 	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1372 	if (diff)
1373 		return diff;
1374 
1375 	diff = b->clock - a->clock;
1376 	return diff;
1377 }
1378 
1379 /**
1380  * drm_mode_sort - sort mode list
1381  * @mode_list: list of drm_display_mode structures to sort
1382  *
1383  * Sort @mode_list by favorability, moving good modes to the head of the list.
1384  */
drm_mode_sort(struct list_head * mode_list)1385 void drm_mode_sort(struct list_head *mode_list)
1386 {
1387 	list_sort(NULL, mode_list, drm_mode_compare);
1388 }
1389 EXPORT_SYMBOL(drm_mode_sort);
1390 
1391 /**
1392  * drm_connector_list_update - update the mode list for the connector
1393  * @connector: the connector to update
1394  *
1395  * This moves the modes from the @connector probed_modes list
1396  * to the actual mode list. It compares the probed mode against the current
1397  * list and only adds different/new modes.
1398  *
1399  * This is just a helper functions doesn't validate any modes itself and also
1400  * doesn't prune any invalid modes. Callers need to do that themselves.
1401  */
drm_connector_list_update(struct drm_connector * connector)1402 void drm_connector_list_update(struct drm_connector *connector)
1403 {
1404 	struct drm_display_mode *pmode, *pt;
1405 
1406 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1407 
1408 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1409 		struct drm_display_mode *mode;
1410 		bool found_it = false;
1411 
1412 		/* go through current modes checking for the new probed mode */
1413 		list_for_each_entry(mode, &connector->modes, head) {
1414 			if (!drm_mode_equal(pmode, mode))
1415 				continue;
1416 
1417 			found_it = true;
1418 
1419 			/*
1420 			 * If the old matching mode is stale (ie. left over
1421 			 * from a previous probe) just replace it outright.
1422 			 * Otherwise just merge the type bits between all
1423 			 * equal probed modes.
1424 			 *
1425 			 * If two probed modes are considered equal, pick the
1426 			 * actual timings from the one that's marked as
1427 			 * preferred (in case the match isn't 100%). If
1428 			 * multiple or zero preferred modes are present, favor
1429 			 * the mode added to the probed_modes list first.
1430 			 */
1431 			if (mode->status == MODE_STALE) {
1432 				drm_mode_copy(mode, pmode);
1433 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1434 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1435 				pmode->type |= mode->type;
1436 				drm_mode_copy(mode, pmode);
1437 			} else {
1438 				mode->type |= pmode->type;
1439 			}
1440 
1441 			list_del(&pmode->head);
1442 			drm_mode_destroy(connector->dev, pmode);
1443 			break;
1444 		}
1445 
1446 		if (!found_it) {
1447 			list_move_tail(&pmode->head, &connector->modes);
1448 		}
1449 	}
1450 }
1451 EXPORT_SYMBOL(drm_connector_list_update);
1452 
drm_mode_parse_cmdline_bpp(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1453 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1454 				      struct drm_cmdline_mode *mode)
1455 {
1456 	unsigned int bpp;
1457 
1458 	if (str[0] != '-')
1459 		return -EINVAL;
1460 
1461 	str++;
1462 	bpp = simple_strtol(str, end_ptr, 10);
1463 	if (*end_ptr == str)
1464 		return -EINVAL;
1465 
1466 	mode->bpp = bpp;
1467 	mode->bpp_specified = true;
1468 
1469 	return 0;
1470 }
1471 
drm_mode_parse_cmdline_refresh(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1472 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1473 					  struct drm_cmdline_mode *mode)
1474 {
1475 	unsigned int refresh;
1476 
1477 	if (str[0] != '@')
1478 		return -EINVAL;
1479 
1480 	str++;
1481 	refresh = simple_strtol(str, end_ptr, 10);
1482 	if (*end_ptr == str)
1483 		return -EINVAL;
1484 
1485 	mode->refresh = refresh;
1486 	mode->refresh_specified = true;
1487 
1488 	return 0;
1489 }
1490 
drm_mode_parse_cmdline_extra(const char * str,int length,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1491 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1492 					bool freestanding,
1493 					const struct drm_connector *connector,
1494 					struct drm_cmdline_mode *mode)
1495 {
1496 	int i;
1497 
1498 	for (i = 0; i < length; i++) {
1499 		switch (str[i]) {
1500 		case 'i':
1501 			if (freestanding)
1502 				return -EINVAL;
1503 
1504 			mode->interlace = true;
1505 			break;
1506 		case 'm':
1507 			if (freestanding)
1508 				return -EINVAL;
1509 
1510 			mode->margins = true;
1511 			break;
1512 		case 'D':
1513 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1514 				return -EINVAL;
1515 
1516 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1517 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1518 				mode->force = DRM_FORCE_ON;
1519 			else
1520 				mode->force = DRM_FORCE_ON_DIGITAL;
1521 			break;
1522 		case 'd':
1523 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1524 				return -EINVAL;
1525 
1526 			mode->force = DRM_FORCE_OFF;
1527 			break;
1528 		case 'e':
1529 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1530 				return -EINVAL;
1531 
1532 			mode->force = DRM_FORCE_ON;
1533 			break;
1534 		default:
1535 			return -EINVAL;
1536 		}
1537 	}
1538 
1539 	return 0;
1540 }
1541 
drm_mode_parse_cmdline_res_mode(const char * str,unsigned int length,bool extras,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1542 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1543 					   bool extras,
1544 					   const struct drm_connector *connector,
1545 					   struct drm_cmdline_mode *mode)
1546 {
1547 	const char *str_start = str;
1548 	bool rb = false, cvt = false;
1549 	int xres = 0, yres = 0;
1550 	int remaining, i;
1551 	char *end_ptr;
1552 
1553 	xres = simple_strtol(str, &end_ptr, 10);
1554 	if (end_ptr == str)
1555 		return -EINVAL;
1556 
1557 	if (end_ptr[0] != 'x')
1558 		return -EINVAL;
1559 	end_ptr++;
1560 
1561 	str = end_ptr;
1562 	yres = simple_strtol(str, &end_ptr, 10);
1563 	if (end_ptr == str)
1564 		return -EINVAL;
1565 
1566 	remaining = length - (end_ptr - str_start);
1567 	if (remaining < 0)
1568 		return -EINVAL;
1569 
1570 	for (i = 0; i < remaining; i++) {
1571 		switch (end_ptr[i]) {
1572 		case 'M':
1573 			cvt = true;
1574 			break;
1575 		case 'R':
1576 			rb = true;
1577 			break;
1578 		default:
1579 			/*
1580 			 * Try to pass that to our extras parsing
1581 			 * function to handle the case where the
1582 			 * extras are directly after the resolution
1583 			 */
1584 			if (extras) {
1585 				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1586 								       1,
1587 								       false,
1588 								       connector,
1589 								       mode);
1590 				if (ret)
1591 					return ret;
1592 			} else {
1593 				return -EINVAL;
1594 			}
1595 		}
1596 	}
1597 
1598 	mode->xres = xres;
1599 	mode->yres = yres;
1600 	mode->cvt = cvt;
1601 	mode->rb = rb;
1602 
1603 	return 0;
1604 }
1605 
drm_mode_parse_cmdline_int(const char * delim,unsigned int * int_ret)1606 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
1607 {
1608 	const char *value;
1609 	char *endp;
1610 
1611 	/*
1612 	 * delim must point to the '=', otherwise it is a syntax error and
1613 	 * if delim points to the terminating zero, then delim + 1 will point
1614 	 * past the end of the string.
1615 	 */
1616 	if (*delim != '=')
1617 		return -EINVAL;
1618 
1619 	value = delim + 1;
1620 	*int_ret = simple_strtol(value, &endp, 10);
1621 
1622 	/* Make sure we have parsed something */
1623 	if (endp == value)
1624 		return -EINVAL;
1625 
1626 	return 0;
1627 }
1628 
drm_mode_parse_panel_orientation(const char * delim,struct drm_cmdline_mode * mode)1629 static int drm_mode_parse_panel_orientation(const char *delim,
1630 					    struct drm_cmdline_mode *mode)
1631 {
1632 	const char *value;
1633 
1634 	if (*delim != '=')
1635 		return -EINVAL;
1636 
1637 	value = delim + 1;
1638 	delim = strchr(value, ',');
1639 	if (!delim)
1640 		delim = value + strlen(value);
1641 
1642 	if (!strncmp(value, "normal", delim - value))
1643 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1644 	else if (!strncmp(value, "upside_down", delim - value))
1645 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1646 	else if (!strncmp(value, "left_side_up", delim - value))
1647 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
1648 	else if (!strncmp(value, "right_side_up", delim - value))
1649 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
1650 	else
1651 		return -EINVAL;
1652 
1653 	return 0;
1654 }
1655 
drm_mode_parse_cmdline_options(const char * str,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1656 static int drm_mode_parse_cmdline_options(const char *str,
1657 					  bool freestanding,
1658 					  const struct drm_connector *connector,
1659 					  struct drm_cmdline_mode *mode)
1660 {
1661 	unsigned int deg, margin, rotation = 0;
1662 	const char *delim, *option, *sep;
1663 
1664 	option = str;
1665 	do {
1666 		delim = strchr(option, '=');
1667 		if (!delim) {
1668 			delim = strchr(option, ',');
1669 
1670 			if (!delim)
1671 				delim = option + strlen(option);
1672 		}
1673 
1674 		if (!strncmp(option, "rotate", delim - option)) {
1675 			if (drm_mode_parse_cmdline_int(delim, &deg))
1676 				return -EINVAL;
1677 
1678 			switch (deg) {
1679 			case 0:
1680 				rotation |= DRM_MODE_ROTATE_0;
1681 				break;
1682 
1683 			case 90:
1684 				rotation |= DRM_MODE_ROTATE_90;
1685 				break;
1686 
1687 			case 180:
1688 				rotation |= DRM_MODE_ROTATE_180;
1689 				break;
1690 
1691 			case 270:
1692 				rotation |= DRM_MODE_ROTATE_270;
1693 				break;
1694 
1695 			default:
1696 				return -EINVAL;
1697 			}
1698 		} else if (!strncmp(option, "reflect_x", delim - option)) {
1699 			rotation |= DRM_MODE_REFLECT_X;
1700 		} else if (!strncmp(option, "reflect_y", delim - option)) {
1701 			rotation |= DRM_MODE_REFLECT_Y;
1702 		} else if (!strncmp(option, "margin_right", delim - option)) {
1703 			if (drm_mode_parse_cmdline_int(delim, &margin))
1704 				return -EINVAL;
1705 
1706 			mode->tv_margins.right = margin;
1707 		} else if (!strncmp(option, "margin_left", delim - option)) {
1708 			if (drm_mode_parse_cmdline_int(delim, &margin))
1709 				return -EINVAL;
1710 
1711 			mode->tv_margins.left = margin;
1712 		} else if (!strncmp(option, "margin_top", delim - option)) {
1713 			if (drm_mode_parse_cmdline_int(delim, &margin))
1714 				return -EINVAL;
1715 
1716 			mode->tv_margins.top = margin;
1717 		} else if (!strncmp(option, "margin_bottom", delim - option)) {
1718 			if (drm_mode_parse_cmdline_int(delim, &margin))
1719 				return -EINVAL;
1720 
1721 			mode->tv_margins.bottom = margin;
1722 		} else if (!strncmp(option, "panel_orientation", delim - option)) {
1723 			if (drm_mode_parse_panel_orientation(delim, mode))
1724 				return -EINVAL;
1725 		} else {
1726 			return -EINVAL;
1727 		}
1728 		sep = strchr(delim, ',');
1729 		option = sep + 1;
1730 	} while (sep);
1731 
1732 	if (rotation && freestanding)
1733 		return -EINVAL;
1734 
1735 	if (!(rotation & DRM_MODE_ROTATE_MASK))
1736 		rotation |= DRM_MODE_ROTATE_0;
1737 
1738 	/* Make sure there is exactly one rotation defined */
1739 	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
1740 		return -EINVAL;
1741 
1742 	mode->rotation_reflection = rotation;
1743 
1744 	return 0;
1745 }
1746 
1747 static const char * const drm_named_modes_whitelist[] = {
1748 	"NTSC",
1749 	"PAL",
1750 };
1751 
1752 /**
1753  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1754  * @mode_option: optional per connector mode option
1755  * @connector: connector to parse modeline for
1756  * @mode: preallocated drm_cmdline_mode structure to fill out
1757  *
1758  * This parses @mode_option command line modeline for modes and options to
1759  * configure the connector. If @mode_option is NULL the default command line
1760  * modeline in fb_mode_option will be parsed instead.
1761  *
1762  * This uses the same parameters as the fb modedb.c, except for an extra
1763  * force-enable, force-enable-digital and force-disable bit at the end::
1764  *
1765  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1766  *
1767  * Additionals options can be provided following the mode, using a comma to
1768  * separate each option. Valid options can be found in
1769  * Documentation/fb/modedb.rst.
1770  *
1771  * The intermediate drm_cmdline_mode structure is required to store additional
1772  * options from the command line modline like the force-enable/disable flag.
1773  *
1774  * Returns:
1775  * True if a valid modeline has been parsed, false otherwise.
1776  */
drm_mode_parse_command_line_for_connector(const char * mode_option,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1777 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1778 					       const struct drm_connector *connector,
1779 					       struct drm_cmdline_mode *mode)
1780 {
1781 	const char *name;
1782 	bool freestanding = false, parse_extras = false;
1783 	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1784 	unsigned int mode_end = 0;
1785 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1786 	const char *options_ptr = NULL;
1787 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1788 	int i, len, ret;
1789 
1790 	memset(mode, 0, sizeof(*mode));
1791 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
1792 
1793 	if (!mode_option)
1794 		return false;
1795 
1796 	name = mode_option;
1797 
1798 	/* Try to locate the bpp and refresh specifiers, if any */
1799 	bpp_ptr = strchr(name, '-');
1800 	if (bpp_ptr)
1801 		bpp_off = bpp_ptr - name;
1802 
1803 	refresh_ptr = strchr(name, '@');
1804 	if (refresh_ptr)
1805 		refresh_off = refresh_ptr - name;
1806 
1807 	/* Locate the start of named options */
1808 	options_ptr = strchr(name, ',');
1809 	if (options_ptr)
1810 		options_off = options_ptr - name;
1811 
1812 	/* Locate the end of the name / resolution, and parse it */
1813 	if (bpp_ptr) {
1814 		mode_end = bpp_off;
1815 	} else if (refresh_ptr) {
1816 		mode_end = refresh_off;
1817 	} else if (options_ptr) {
1818 		mode_end = options_off;
1819 		parse_extras = true;
1820 	} else {
1821 		mode_end = strlen(name);
1822 		parse_extras = true;
1823 	}
1824 
1825 	/* First check for a named mode */
1826 	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
1827 		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
1828 		if (ret == mode_end) {
1829 			if (refresh_ptr)
1830 				return false; /* named + refresh is invalid */
1831 
1832 			strcpy(mode->name, drm_named_modes_whitelist[i]);
1833 			mode->specified = true;
1834 			break;
1835 		}
1836 	}
1837 
1838 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
1839 	if (!mode->specified && isdigit(name[0])) {
1840 		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1841 						      parse_extras,
1842 						      connector,
1843 						      mode);
1844 		if (ret)
1845 			return false;
1846 
1847 		mode->specified = true;
1848 	}
1849 
1850 	/* No mode? Check for freestanding extras and/or options */
1851 	if (!mode->specified) {
1852 		unsigned int len = strlen(mode_option);
1853 
1854 		if (bpp_ptr || refresh_ptr)
1855 			return false; /* syntax error */
1856 
1857 		if (len == 1 || (len >= 2 && mode_option[1] == ','))
1858 			extra_ptr = mode_option;
1859 		else
1860 			options_ptr = mode_option - 1;
1861 
1862 		freestanding = true;
1863 	}
1864 
1865 	if (bpp_ptr) {
1866 		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1867 		if (ret)
1868 			return false;
1869 
1870 		mode->bpp_specified = true;
1871 	}
1872 
1873 	if (refresh_ptr) {
1874 		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1875 						     &refresh_end_ptr, mode);
1876 		if (ret)
1877 			return false;
1878 
1879 		mode->refresh_specified = true;
1880 	}
1881 
1882 	/*
1883 	 * Locate the end of the bpp / refresh, and parse the extras
1884 	 * if relevant
1885 	 */
1886 	if (bpp_ptr && refresh_ptr)
1887 		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1888 	else if (bpp_ptr)
1889 		extra_ptr = bpp_end_ptr;
1890 	else if (refresh_ptr)
1891 		extra_ptr = refresh_end_ptr;
1892 
1893 	if (extra_ptr) {
1894 		if (options_ptr)
1895 			len = options_ptr - extra_ptr;
1896 		else
1897 			len = strlen(extra_ptr);
1898 
1899 		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
1900 						   connector, mode);
1901 		if (ret)
1902 			return false;
1903 	}
1904 
1905 	if (options_ptr) {
1906 		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
1907 						     freestanding,
1908 						     connector, mode);
1909 		if (ret)
1910 			return false;
1911 	}
1912 
1913 	return true;
1914 }
1915 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1916 
1917 /**
1918  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1919  * @dev: DRM device to create the new mode for
1920  * @cmd: input command line modeline
1921  *
1922  * Returns:
1923  * Pointer to converted mode on success, NULL on error.
1924  */
1925 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1926 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1927 				  struct drm_cmdline_mode *cmd)
1928 {
1929 	struct drm_display_mode *mode;
1930 
1931 	if (cmd->xres == 0 || cmd->yres == 0)
1932 		return NULL;
1933 
1934 	if (cmd->cvt)
1935 		mode = drm_cvt_mode(dev,
1936 				    cmd->xres, cmd->yres,
1937 				    cmd->refresh_specified ? cmd->refresh : 60,
1938 				    cmd->rb, cmd->interlace,
1939 				    cmd->margins);
1940 	else
1941 		mode = drm_gtf_mode(dev,
1942 				    cmd->xres, cmd->yres,
1943 				    cmd->refresh_specified ? cmd->refresh : 60,
1944 				    cmd->interlace,
1945 				    cmd->margins);
1946 	if (!mode)
1947 		return NULL;
1948 
1949 	mode->type |= DRM_MODE_TYPE_USERDEF;
1950 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1951 	if (cmd->xres == 1366)
1952 		drm_mode_fixup_1366x768(mode);
1953 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1954 	return mode;
1955 }
1956 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1957 
1958 /**
1959  * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
1960  * @out: drm_mode_modeinfo struct to return to the user
1961  * @in: drm_display_mode to use
1962  *
1963  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1964  * the user.
1965  */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1966 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1967 			       const struct drm_display_mode *in)
1968 {
1969 	out->clock = in->clock;
1970 	out->hdisplay = in->hdisplay;
1971 	out->hsync_start = in->hsync_start;
1972 	out->hsync_end = in->hsync_end;
1973 	out->htotal = in->htotal;
1974 	out->hskew = in->hskew;
1975 	out->vdisplay = in->vdisplay;
1976 	out->vsync_start = in->vsync_start;
1977 	out->vsync_end = in->vsync_end;
1978 	out->vtotal = in->vtotal;
1979 	out->vscan = in->vscan;
1980 	out->vrefresh = drm_mode_vrefresh(in);
1981 	out->flags = in->flags;
1982 	out->type = in->type;
1983 
1984 	switch (in->picture_aspect_ratio) {
1985 	case HDMI_PICTURE_ASPECT_4_3:
1986 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1987 		break;
1988 	case HDMI_PICTURE_ASPECT_16_9:
1989 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1990 		break;
1991 	case HDMI_PICTURE_ASPECT_64_27:
1992 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1993 		break;
1994 	case HDMI_PICTURE_ASPECT_256_135:
1995 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1996 		break;
1997 	default:
1998 		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
1999 		     in->picture_aspect_ratio);
2000 		fallthrough;
2001 	case HDMI_PICTURE_ASPECT_NONE:
2002 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2003 		break;
2004 	}
2005 
2006 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2007 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2008 }
2009 
2010 /**
2011  * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2012  * @dev: drm device
2013  * @out: drm_display_mode to return to the user
2014  * @in: drm_mode_modeinfo to use
2015  *
2016  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2017  * the caller.
2018  *
2019  * Returns:
2020  * Zero on success, negative errno on failure.
2021  */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)2022 int drm_mode_convert_umode(struct drm_device *dev,
2023 			   struct drm_display_mode *out,
2024 			   const struct drm_mode_modeinfo *in)
2025 {
2026 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2027 		return -ERANGE;
2028 
2029 	out->clock = in->clock;
2030 	out->hdisplay = in->hdisplay;
2031 	out->hsync_start = in->hsync_start;
2032 	out->hsync_end = in->hsync_end;
2033 	out->htotal = in->htotal;
2034 	out->hskew = in->hskew;
2035 	out->vdisplay = in->vdisplay;
2036 	out->vsync_start = in->vsync_start;
2037 	out->vsync_end = in->vsync_end;
2038 	out->vtotal = in->vtotal;
2039 	out->vscan = in->vscan;
2040 	out->flags = in->flags;
2041 	/*
2042 	 * Old xf86-video-vmware (possibly others too) used to
2043 	 * leave 'type' uninitialized. Just ignore any bits we
2044 	 * don't like. It's a just hint after all, and more
2045 	 * useful for the kernel->userspace direction anyway.
2046 	 */
2047 	out->type = in->type & DRM_MODE_TYPE_ALL;
2048 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2049 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2050 
2051 	/* Clearing picture aspect ratio bits from out flags,
2052 	 * as the aspect-ratio information is not stored in
2053 	 * flags for kernel-mode, but in picture_aspect_ratio.
2054 	 */
2055 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2056 
2057 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2058 	case DRM_MODE_FLAG_PIC_AR_4_3:
2059 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2060 		break;
2061 	case DRM_MODE_FLAG_PIC_AR_16_9:
2062 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2063 		break;
2064 	case DRM_MODE_FLAG_PIC_AR_64_27:
2065 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2066 		break;
2067 	case DRM_MODE_FLAG_PIC_AR_256_135:
2068 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2069 		break;
2070 	case DRM_MODE_FLAG_PIC_AR_NONE:
2071 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2072 		break;
2073 	default:
2074 		return -EINVAL;
2075 	}
2076 
2077 	out->status = drm_mode_validate_driver(dev, out);
2078 	if (out->status != MODE_OK)
2079 		return -EINVAL;
2080 
2081 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2082 
2083 	return 0;
2084 }
2085 
2086 /**
2087  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2088  * output format
2089  *
2090  * @display: display under action
2091  * @mode: video mode to be tested.
2092  *
2093  * Returns:
2094  * true if the mode can be supported in YCBCR420 format
2095  * false if not.
2096  */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)2097 bool drm_mode_is_420_only(const struct drm_display_info *display,
2098 			  const struct drm_display_mode *mode)
2099 {
2100 	u8 vic = drm_match_cea_mode(mode);
2101 
2102 	return test_bit(vic, display->hdmi.y420_vdb_modes);
2103 }
2104 EXPORT_SYMBOL(drm_mode_is_420_only);
2105 
2106 /**
2107  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2108  * output format also (along with RGB/YCBCR444/422)
2109  *
2110  * @display: display under action.
2111  * @mode: video mode to be tested.
2112  *
2113  * Returns:
2114  * true if the mode can be support YCBCR420 format
2115  * false if not.
2116  */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)2117 bool drm_mode_is_420_also(const struct drm_display_info *display,
2118 			  const struct drm_display_mode *mode)
2119 {
2120 	u8 vic = drm_match_cea_mode(mode);
2121 
2122 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2123 }
2124 EXPORT_SYMBOL(drm_mode_is_420_also);
2125 /**
2126  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2127  * output format
2128  *
2129  * @display: display under action.
2130  * @mode: video mode to be tested.
2131  *
2132  * Returns:
2133  * true if the mode can be supported in YCBCR420 format
2134  * false if not.
2135  */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)2136 bool drm_mode_is_420(const struct drm_display_info *display,
2137 		     const struct drm_display_mode *mode)
2138 {
2139 	return drm_mode_is_420_only(display, mode) ||
2140 		drm_mode_is_420_also(display, mode);
2141 }
2142 EXPORT_SYMBOL(drm_mode_is_420);
2143