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 #include <linux/fb.h>
38 
39 #include <video/of_display_timing.h>
40 #include <video/of_videomode.h>
41 #include <video/videomode.h>
42 
43 #include <drm/drm_crtc.h>
44 #include <drm/drm_device.h>
45 #include <drm/drm_edid.h>
46 #include <drm/drm_modes.h>
47 #include <drm/drm_print.h>
48 
49 #include "drm_crtc_internal.h"
50 
51 /**
52  * drm_mode_debug_printmodeline - print a mode to dmesg
53  * @mode: mode to print
54  *
55  * Describe @mode using DRM_DEBUG.
56  */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)57 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
58 {
59 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
60 }
61 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
62 
63 /**
64  * drm_mode_create - create a new display mode
65  * @dev: DRM device
66  *
67  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
68  * and return it.
69  *
70  * Returns:
71  * Pointer to new mode on success, NULL on error.
72  */
drm_mode_create(struct drm_device * dev)73 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
74 {
75 	struct drm_display_mode *nmode;
76 
77 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
78 	if (!nmode)
79 		return NULL;
80 
81 	return nmode;
82 }
83 EXPORT_SYMBOL(drm_mode_create);
84 
85 /**
86  * drm_mode_destroy - remove a mode
87  * @dev: DRM device
88  * @mode: mode to remove
89  *
90  * Release @mode's unique ID, then free it @mode structure itself using kfree.
91  */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)92 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
93 {
94 	if (!mode)
95 		return;
96 
97 	kfree(mode);
98 }
99 EXPORT_SYMBOL(drm_mode_destroy);
100 
101 /**
102  * drm_mode_probed_add - add a mode to a connector's probed_mode list
103  * @connector: connector the new mode
104  * @mode: mode data
105  *
106  * Add @mode to @connector's probed_mode list for later use. This list should
107  * then in a second step get filtered and all the modes actually supported by
108  * the hardware moved to the @connector's modes list.
109  */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)110 void drm_mode_probed_add(struct drm_connector *connector,
111 			 struct drm_display_mode *mode)
112 {
113 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
114 
115 	list_add_tail(&mode->head, &connector->probed_modes);
116 }
117 EXPORT_SYMBOL(drm_mode_probed_add);
118 
119 /**
120  * drm_cvt_mode -create a modeline based on the CVT algorithm
121  * @dev: drm device
122  * @hdisplay: hdisplay size
123  * @vdisplay: vdisplay size
124  * @vrefresh: vrefresh rate
125  * @reduced: whether to use reduced blanking
126  * @interlaced: whether to compute an interlaced mode
127  * @margins: whether to add margins (borders)
128  *
129  * This function is called to generate the modeline based on CVT algorithm
130  * according to the hdisplay, vdisplay, vrefresh.
131  * It is based from the VESA(TM) Coordinated Video Timing Generator by
132  * Graham Loveridge April 9, 2003 available at
133  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
134  *
135  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
136  * What I have done is to translate it by using integer calculation.
137  *
138  * Returns:
139  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
140  * The display mode object is allocated with drm_mode_create(). Returns NULL
141  * when no mode could be allocated.
142  */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)143 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
144 				      int vdisplay, int vrefresh,
145 				      bool reduced, bool interlaced, bool margins)
146 {
147 #define HV_FACTOR			1000
148 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
149 #define	CVT_MARGIN_PERCENTAGE		18
150 	/* 2) character cell horizontal granularity (pixels) - default 8 */
151 #define	CVT_H_GRANULARITY		8
152 	/* 3) Minimum vertical porch (lines) - default 3 */
153 #define	CVT_MIN_V_PORCH			3
154 	/* 4) Minimum number of vertical back porch lines - default 6 */
155 #define	CVT_MIN_V_BPORCH		6
156 	/* Pixel Clock step (kHz) */
157 #define CVT_CLOCK_STEP			250
158 	struct drm_display_mode *drm_mode;
159 	unsigned int vfieldrate, hperiod;
160 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
161 	int interlace;
162 	u64 tmp;
163 
164 	if (!hdisplay || !vdisplay)
165 		return NULL;
166 
167 	/* allocate the drm_display_mode structure. If failure, we will
168 	 * return directly
169 	 */
170 	drm_mode = drm_mode_create(dev);
171 	if (!drm_mode)
172 		return NULL;
173 
174 	/* the CVT default refresh rate is 60Hz */
175 	if (!vrefresh)
176 		vrefresh = 60;
177 
178 	/* the required field fresh rate */
179 	if (interlaced)
180 		vfieldrate = vrefresh * 2;
181 	else
182 		vfieldrate = vrefresh;
183 
184 	/* horizontal pixels */
185 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
186 
187 	/* determine the left&right borders */
188 	hmargin = 0;
189 	if (margins) {
190 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
191 		hmargin -= hmargin % CVT_H_GRANULARITY;
192 	}
193 	/* find the total active pixels */
194 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
195 
196 	/* find the number of lines per field */
197 	if (interlaced)
198 		vdisplay_rnd = vdisplay / 2;
199 	else
200 		vdisplay_rnd = vdisplay;
201 
202 	/* find the top & bottom borders */
203 	vmargin = 0;
204 	if (margins)
205 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
206 
207 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
208 
209 	/* Interlaced */
210 	if (interlaced)
211 		interlace = 1;
212 	else
213 		interlace = 0;
214 
215 	/* Determine VSync Width from aspect ratio */
216 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
217 		vsync = 4;
218 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
219 		vsync = 5;
220 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
221 		vsync = 6;
222 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
223 		vsync = 7;
224 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
225 		vsync = 7;
226 	else /* custom */
227 		vsync = 10;
228 
229 	if (!reduced) {
230 		/* simplify the GTF calculation */
231 		/* 4) Minimum time of vertical sync + back porch interval (µs)
232 		 * default 550.0
233 		 */
234 		int tmp1, tmp2;
235 #define CVT_MIN_VSYNC_BP	550
236 		/* 3) Nominal HSync width (% of line period) - default 8 */
237 #define CVT_HSYNC_PERCENTAGE	8
238 		unsigned int hblank_percentage;
239 		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
240 
241 		/* estimated the horizontal period */
242 		tmp1 = HV_FACTOR * 1000000  -
243 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
244 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
245 				interlace;
246 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
247 
248 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
249 		/* 9. Find number of lines in sync + backporch */
250 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
251 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
252 		else
253 			vsyncandback_porch = tmp1;
254 		/* 10. Find number of lines in back porch */
255 		vback_porch = vsyncandback_porch - vsync;
256 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
257 				vsyncandback_porch + CVT_MIN_V_PORCH;
258 		/* 5) Definition of Horizontal blanking time limitation */
259 		/* Gradient (%/kHz) - default 600 */
260 #define CVT_M_FACTOR	600
261 		/* Offset (%) - default 40 */
262 #define CVT_C_FACTOR	40
263 		/* Blanking time scaling factor - default 128 */
264 #define CVT_K_FACTOR	128
265 		/* Scaling factor weighting - default 20 */
266 #define CVT_J_FACTOR	20
267 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
268 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
269 			 CVT_J_FACTOR)
270 		/* 12. Find ideal blanking duty cycle from formula */
271 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
272 					hperiod / 1000;
273 		/* 13. Blanking time */
274 		if (hblank_percentage < 20 * HV_FACTOR)
275 			hblank_percentage = 20 * HV_FACTOR;
276 		hblank = drm_mode->hdisplay * hblank_percentage /
277 			 (100 * HV_FACTOR - hblank_percentage);
278 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
279 		/* 14. find the total pixels per line */
280 		drm_mode->htotal = drm_mode->hdisplay + hblank;
281 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
282 		drm_mode->hsync_start = drm_mode->hsync_end -
283 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
284 		drm_mode->hsync_start += CVT_H_GRANULARITY -
285 			drm_mode->hsync_start % CVT_H_GRANULARITY;
286 		/* fill the Vsync values */
287 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
288 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
289 	} else {
290 		/* Reduced blanking */
291 		/* Minimum vertical blanking interval time (µs)- default 460 */
292 #define CVT_RB_MIN_VBLANK	460
293 		/* Fixed number of clocks for horizontal sync */
294 #define CVT_RB_H_SYNC		32
295 		/* Fixed number of clocks for horizontal blanking */
296 #define CVT_RB_H_BLANK		160
297 		/* Fixed number of lines for vertical front porch - default 3*/
298 #define CVT_RB_VFPORCH		3
299 		int vbilines;
300 		int tmp1, tmp2;
301 		/* 8. Estimate Horizontal period. */
302 		tmp1 = HV_FACTOR * 1000000 -
303 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
304 		tmp2 = vdisplay_rnd + 2 * vmargin;
305 		hperiod = tmp1 / (tmp2 * vfieldrate);
306 		/* 9. Find number of lines in vertical blanking */
307 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
308 		/* 10. Check if vertical blanking is sufficient */
309 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
310 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
311 		/* 11. Find total number of lines in vertical field */
312 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
313 		/* 12. Find total number of pixels in a line */
314 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
315 		/* Fill in HSync values */
316 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
317 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
318 		/* Fill in VSync values */
319 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
320 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
321 	}
322 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
323 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
324 	tmp *= HV_FACTOR * 1000;
325 	do_div(tmp, hperiod);
326 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
327 	drm_mode->clock = tmp;
328 	/* 18/16. Find actual vertical frame frequency */
329 	/* ignore - just set the mode flag for interlaced */
330 	if (interlaced) {
331 		drm_mode->vtotal *= 2;
332 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
333 	}
334 	/* Fill the mode line name */
335 	drm_mode_set_name(drm_mode);
336 	if (reduced)
337 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
338 					DRM_MODE_FLAG_NVSYNC);
339 	else
340 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
341 					DRM_MODE_FLAG_NHSYNC);
342 
343 	return drm_mode;
344 }
345 EXPORT_SYMBOL(drm_cvt_mode);
346 
347 /**
348  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
349  * @dev: drm device
350  * @hdisplay: hdisplay size
351  * @vdisplay: vdisplay size
352  * @vrefresh: vrefresh rate.
353  * @interlaced: whether to compute an interlaced mode
354  * @margins: desired margin (borders) size
355  * @GTF_M: extended GTF formula parameters
356  * @GTF_2C: extended GTF formula parameters
357  * @GTF_K: extended GTF formula parameters
358  * @GTF_2J: extended GTF formula parameters
359  *
360  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
361  * in here multiplied by two.  For a C of 40, pass in 80.
362  *
363  * Returns:
364  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
365  * The display mode object is allocated with drm_mode_create(). Returns NULL
366  * when no mode could be allocated.
367  */
368 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)369 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
370 		     int vrefresh, bool interlaced, int margins,
371 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
372 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
373 #define	GTF_MARGIN_PERCENTAGE		18
374 	/* 2) character cell horizontal granularity (pixels) - default 8 */
375 #define	GTF_CELL_GRAN			8
376 	/* 3) Minimum vertical porch (lines) - default 3 */
377 #define	GTF_MIN_V_PORCH			1
378 	/* width of vsync in lines */
379 #define V_SYNC_RQD			3
380 	/* width of hsync as % of total line */
381 #define H_SYNC_PERCENT			8
382 	/* min time of vsync + back porch (microsec) */
383 #define MIN_VSYNC_PLUS_BP		550
384 	/* C' and M' are part of the Blanking Duty Cycle computation */
385 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
386 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
387 	struct drm_display_mode *drm_mode;
388 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
389 	int top_margin, bottom_margin;
390 	int interlace;
391 	unsigned int hfreq_est;
392 	int vsync_plus_bp, __maybe_unused vback_porch;
393 	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
394 	unsigned int __maybe_unused hperiod;
395 	unsigned int vfield_rate, __maybe_unused vframe_rate;
396 	int left_margin, right_margin;
397 	unsigned int total_active_pixels, ideal_duty_cycle;
398 	unsigned int hblank, total_pixels, pixel_freq;
399 	int hsync, hfront_porch, vodd_front_porch_lines;
400 	unsigned int tmp1, tmp2;
401 
402 	if (!hdisplay || !vdisplay)
403 		return NULL;
404 
405 	drm_mode = drm_mode_create(dev);
406 	if (!drm_mode)
407 		return NULL;
408 
409 	/* 1. In order to give correct results, the number of horizontal
410 	 * pixels requested is first processed to ensure that it is divisible
411 	 * by the character size, by rounding it to the nearest character
412 	 * cell boundary:
413 	 */
414 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
415 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
416 
417 	/* 2. If interlace is requested, the number of vertical lines assumed
418 	 * by the calculation must be halved, as the computation calculates
419 	 * the number of vertical lines per field.
420 	 */
421 	if (interlaced)
422 		vdisplay_rnd = vdisplay / 2;
423 	else
424 		vdisplay_rnd = vdisplay;
425 
426 	/* 3. Find the frame rate required: */
427 	if (interlaced)
428 		vfieldrate_rqd = vrefresh * 2;
429 	else
430 		vfieldrate_rqd = vrefresh;
431 
432 	/* 4. Find number of lines in Top margin: */
433 	top_margin = 0;
434 	if (margins)
435 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
436 				1000;
437 	/* 5. Find number of lines in bottom margin: */
438 	bottom_margin = top_margin;
439 
440 	/* 6. If interlace is required, then set variable interlace: */
441 	if (interlaced)
442 		interlace = 1;
443 	else
444 		interlace = 0;
445 
446 	/* 7. Estimate the Horizontal frequency */
447 	{
448 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
449 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
450 				2 + interlace;
451 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
452 	}
453 
454 	/* 8. Find the number of lines in V sync + back porch */
455 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
456 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
457 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
458 	/*  9. Find the number of lines in V back porch alone: */
459 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
460 	/*  10. Find the total number of lines in Vertical field period: */
461 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
462 			vsync_plus_bp + GTF_MIN_V_PORCH;
463 	/*  11. Estimate the Vertical field frequency: */
464 	vfieldrate_est = hfreq_est / vtotal_lines;
465 	/*  12. Find the actual horizontal period: */
466 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
467 
468 	/*  13. Find the actual Vertical field frequency: */
469 	vfield_rate = hfreq_est / vtotal_lines;
470 	/*  14. Find the Vertical frame frequency: */
471 	if (interlaced)
472 		vframe_rate = vfield_rate / 2;
473 	else
474 		vframe_rate = vfield_rate;
475 	/*  15. Find number of pixels in left margin: */
476 	if (margins)
477 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
478 				1000;
479 	else
480 		left_margin = 0;
481 
482 	/* 16.Find number of pixels in right margin: */
483 	right_margin = left_margin;
484 	/* 17.Find total number of active pixels in image and left and right */
485 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
486 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
487 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
488 				(GTF_M_PRIME * 1000000 / hfreq_est);
489 	/* 19.Find the number of pixels in the blanking time to the nearest
490 	 * double character cell: */
491 	hblank = total_active_pixels * ideal_duty_cycle /
492 			(100000 - ideal_duty_cycle);
493 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
494 	hblank = hblank * 2 * GTF_CELL_GRAN;
495 	/* 20.Find total number of pixels: */
496 	total_pixels = total_active_pixels + hblank;
497 	/* 21.Find pixel clock frequency: */
498 	pixel_freq = total_pixels * hfreq_est / 1000;
499 	/* Stage 1 computations are now complete; I should really pass
500 	 * the results to another function and do the Stage 2 computations,
501 	 * but I only need a few more values so I'll just append the
502 	 * computations here for now */
503 	/* 17. Find the number of pixels in the horizontal sync period: */
504 	hsync = H_SYNC_PERCENT * total_pixels / 100;
505 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
506 	hsync = hsync * GTF_CELL_GRAN;
507 	/* 18. Find the number of pixels in horizontal front porch period */
508 	hfront_porch = hblank / 2 - hsync;
509 	/*  36. Find the number of lines in the odd front porch period: */
510 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
511 
512 	/* finally, pack the results in the mode struct */
513 	drm_mode->hdisplay = hdisplay_rnd;
514 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
515 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
516 	drm_mode->htotal = total_pixels;
517 	drm_mode->vdisplay = vdisplay_rnd;
518 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
519 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
520 	drm_mode->vtotal = vtotal_lines;
521 
522 	drm_mode->clock = pixel_freq;
523 
524 	if (interlaced) {
525 		drm_mode->vtotal *= 2;
526 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
527 	}
528 
529 	drm_mode_set_name(drm_mode);
530 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
531 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
532 	else
533 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
534 
535 	return drm_mode;
536 }
537 EXPORT_SYMBOL(drm_gtf_mode_complex);
538 
539 /**
540  * drm_gtf_mode - create the modeline based on the GTF algorithm
541  * @dev: drm device
542  * @hdisplay: hdisplay size
543  * @vdisplay: vdisplay size
544  * @vrefresh: vrefresh rate.
545  * @interlaced: whether to compute an interlaced mode
546  * @margins: desired margin (borders) size
547  *
548  * return the modeline based on GTF algorithm
549  *
550  * This function is to create the modeline based on the GTF algorithm.
551  * Generalized Timing Formula is derived from:
552  *
553  *	GTF Spreadsheet by Andy Morrish (1/5/97)
554  *	available at https://www.vesa.org
555  *
556  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
557  * What I have done is to translate it by using integer calculation.
558  * I also refer to the function of fb_get_mode in the file of
559  * drivers/video/fbmon.c
560  *
561  * Standard GTF parameters::
562  *
563  *     M = 600
564  *     C = 40
565  *     K = 128
566  *     J = 20
567  *
568  * Returns:
569  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
570  * The display mode object is allocated with drm_mode_create(). Returns NULL
571  * when no mode could be allocated.
572  */
573 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)574 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
575 	     bool interlaced, int margins)
576 {
577 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
578 				    interlaced, margins,
579 				    600, 40 * 2, 128, 20 * 2);
580 }
581 EXPORT_SYMBOL(drm_gtf_mode);
582 
583 #ifdef CONFIG_VIDEOMODE_HELPERS
584 /**
585  * drm_display_mode_from_videomode - fill in @dmode using @vm,
586  * @vm: videomode structure to use as source
587  * @dmode: drm_display_mode structure to use as destination
588  *
589  * Fills out @dmode using the display mode specified in @vm.
590  */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)591 void drm_display_mode_from_videomode(const struct videomode *vm,
592 				     struct drm_display_mode *dmode)
593 {
594 	dmode->hdisplay = vm->hactive;
595 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
596 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
597 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
598 
599 	dmode->vdisplay = vm->vactive;
600 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
601 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
602 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
603 
604 	dmode->clock = vm->pixelclock / 1000;
605 
606 	dmode->flags = 0;
607 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
608 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
609 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
610 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
611 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
612 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
613 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
614 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
615 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
616 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
617 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
618 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
619 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
620 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
621 	drm_mode_set_name(dmode);
622 }
623 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
624 
625 /**
626  * drm_display_mode_to_videomode - fill in @vm using @dmode,
627  * @dmode: drm_display_mode structure to use as source
628  * @vm: videomode structure to use as destination
629  *
630  * Fills out @vm using the display mode specified in @dmode.
631  */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)632 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
633 				   struct videomode *vm)
634 {
635 	vm->hactive = dmode->hdisplay;
636 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
637 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
638 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
639 
640 	vm->vactive = dmode->vdisplay;
641 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
642 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
643 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
644 
645 	vm->pixelclock = dmode->clock * 1000;
646 
647 	vm->flags = 0;
648 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
649 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
650 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
651 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
652 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
653 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
654 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
655 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
656 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
657 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
658 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
659 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
660 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
661 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
662 }
663 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
664 
665 /**
666  * drm_bus_flags_from_videomode - extract information about pixelclk and
667  * DE polarity from videomode and store it in a separate variable
668  * @vm: videomode structure to use
669  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
670  * here
671  *
672  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
673  * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
674  * found in @vm
675  */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)676 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
677 {
678 	*bus_flags = 0;
679 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
680 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
681 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
682 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
683 
684 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
685 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
686 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
687 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
688 
689 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
690 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
691 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
692 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
693 }
694 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
695 
696 #ifdef CONFIG_OF
697 /**
698  * of_get_drm_display_mode - get a drm_display_mode from devicetree
699  * @np: device_node with the timing specification
700  * @dmode: will be set to the return value
701  * @bus_flags: information about pixelclk, sync and DE polarity
702  * @index: index into the list of display timings in devicetree
703  *
704  * This function is expensive and should only be used, if only one mode is to be
705  * read from DT. To get multiple modes start with of_get_display_timings and
706  * work with that instead.
707  *
708  * Returns:
709  * 0 on success, a negative errno code when no of videomode node was found.
710  */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)711 int of_get_drm_display_mode(struct device_node *np,
712 			    struct drm_display_mode *dmode, u32 *bus_flags,
713 			    int index)
714 {
715 	struct videomode vm;
716 	int ret;
717 
718 	ret = of_get_videomode(np, &vm, index);
719 	if (ret)
720 		return ret;
721 
722 	drm_display_mode_from_videomode(&vm, dmode);
723 	if (bus_flags)
724 		drm_bus_flags_from_videomode(&vm, bus_flags);
725 
726 	pr_debug("%pOF: got %dx%d display mode\n",
727 		np, vm.hactive, vm.vactive);
728 	drm_mode_debug_printmodeline(dmode);
729 
730 	return 0;
731 }
732 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
733 
734 /**
735  * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
736  * @np: device_node with the panel-timing specification
737  * @dmode: will be set to the return value
738  * @bus_flags: information about pixelclk, sync and DE polarity
739  *
740  * The mandatory Device Tree properties width-mm and height-mm
741  * are read and set on the display mode.
742  *
743  * Returns:
744  * Zero on success, negative error code on failure.
745  */
of_get_drm_panel_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags)746 int of_get_drm_panel_display_mode(struct device_node *np,
747 				  struct drm_display_mode *dmode, u32 *bus_flags)
748 {
749 	u32 width_mm = 0, height_mm = 0;
750 	struct display_timing timing;
751 	struct videomode vm;
752 	int ret;
753 
754 	ret = of_get_display_timing(np, "panel-timing", &timing);
755 	if (ret)
756 		return ret;
757 
758 	videomode_from_timing(&timing, &vm);
759 
760 	memset(dmode, 0, sizeof(*dmode));
761 	drm_display_mode_from_videomode(&vm, dmode);
762 	if (bus_flags)
763 		drm_bus_flags_from_videomode(&vm, bus_flags);
764 
765 	ret = of_property_read_u32(np, "width-mm", &width_mm);
766 	if (ret)
767 		return ret;
768 
769 	ret = of_property_read_u32(np, "height-mm", &height_mm);
770 	if (ret)
771 		return ret;
772 
773 	dmode->width_mm = width_mm;
774 	dmode->height_mm = height_mm;
775 
776 	drm_mode_debug_printmodeline(dmode);
777 
778 	return 0;
779 }
780 EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
781 #endif /* CONFIG_OF */
782 #endif /* CONFIG_VIDEOMODE_HELPERS */
783 
784 /**
785  * drm_mode_set_name - set the name on a mode
786  * @mode: name will be set in this mode
787  *
788  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
789  * with an optional 'i' suffix for interlaced modes.
790  */
drm_mode_set_name(struct drm_display_mode * mode)791 void drm_mode_set_name(struct drm_display_mode *mode)
792 {
793 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
794 
795 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
796 		 mode->hdisplay, mode->vdisplay,
797 		 interlaced ? "i" : "");
798 }
799 EXPORT_SYMBOL(drm_mode_set_name);
800 
801 /**
802  * drm_mode_vrefresh - get the vrefresh of a mode
803  * @mode: mode
804  *
805  * Returns:
806  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
807  * value first if it is not yet set.
808  */
drm_mode_vrefresh(const struct drm_display_mode * mode)809 int drm_mode_vrefresh(const struct drm_display_mode *mode)
810 {
811 	unsigned int num, den;
812 
813 	if (mode->htotal == 0 || mode->vtotal == 0)
814 		return 0;
815 
816 	num = mode->clock;
817 	den = mode->htotal * mode->vtotal;
818 
819 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
820 		num *= 2;
821 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
822 		den *= 2;
823 	if (mode->vscan > 1)
824 		den *= mode->vscan;
825 
826 	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
827 }
828 EXPORT_SYMBOL(drm_mode_vrefresh);
829 
830 /**
831  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
832  * @mode: mode to query
833  * @hdisplay: hdisplay value to fill in
834  * @vdisplay: vdisplay value to fill in
835  *
836  * The vdisplay value will be doubled if the specified mode is a stereo mode of
837  * the appropriate layout.
838  */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)839 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
840 			    int *hdisplay, int *vdisplay)
841 {
842 	struct drm_display_mode adjusted;
843 
844 	drm_mode_init(&adjusted, mode);
845 
846 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
847 	*hdisplay = adjusted.crtc_hdisplay;
848 	*vdisplay = adjusted.crtc_vdisplay;
849 }
850 EXPORT_SYMBOL(drm_mode_get_hv_timing);
851 
852 /**
853  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
854  * @p: mode
855  * @adjust_flags: a combination of adjustment flags
856  *
857  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
858  *
859  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
860  *   interlaced modes.
861  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
862  *   buffers containing two eyes (only adjust the timings when needed, eg. for
863  *   "frame packing" or "side by side full").
864  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
865  *   be performed for doublescan and vscan > 1 modes respectively.
866  */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)867 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
868 {
869 	if (!p)
870 		return;
871 
872 	p->crtc_clock = p->clock;
873 	p->crtc_hdisplay = p->hdisplay;
874 	p->crtc_hsync_start = p->hsync_start;
875 	p->crtc_hsync_end = p->hsync_end;
876 	p->crtc_htotal = p->htotal;
877 	p->crtc_hskew = p->hskew;
878 	p->crtc_vdisplay = p->vdisplay;
879 	p->crtc_vsync_start = p->vsync_start;
880 	p->crtc_vsync_end = p->vsync_end;
881 	p->crtc_vtotal = p->vtotal;
882 
883 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
884 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
885 			p->crtc_vdisplay /= 2;
886 			p->crtc_vsync_start /= 2;
887 			p->crtc_vsync_end /= 2;
888 			p->crtc_vtotal /= 2;
889 		}
890 	}
891 
892 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
893 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
894 			p->crtc_vdisplay *= 2;
895 			p->crtc_vsync_start *= 2;
896 			p->crtc_vsync_end *= 2;
897 			p->crtc_vtotal *= 2;
898 		}
899 	}
900 
901 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
902 		if (p->vscan > 1) {
903 			p->crtc_vdisplay *= p->vscan;
904 			p->crtc_vsync_start *= p->vscan;
905 			p->crtc_vsync_end *= p->vscan;
906 			p->crtc_vtotal *= p->vscan;
907 		}
908 	}
909 
910 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
911 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
912 
913 		switch (layout) {
914 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
915 			p->crtc_clock *= 2;
916 			p->crtc_vdisplay += p->crtc_vtotal;
917 			p->crtc_vsync_start += p->crtc_vtotal;
918 			p->crtc_vsync_end += p->crtc_vtotal;
919 			p->crtc_vtotal += p->crtc_vtotal;
920 			break;
921 		}
922 	}
923 
924 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
925 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
926 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
927 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
928 }
929 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
930 
931 /**
932  * drm_mode_copy - copy the mode
933  * @dst: mode to overwrite
934  * @src: mode to copy
935  *
936  * Copy an existing mode into another mode, preserving the
937  * list head of the destination mode.
938  */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)939 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
940 {
941 	struct list_head head = dst->head;
942 
943 	*dst = *src;
944 	dst->head = head;
945 }
946 EXPORT_SYMBOL(drm_mode_copy);
947 
948 /**
949  * drm_mode_init - initialize the mode from another mode
950  * @dst: mode to overwrite
951  * @src: mode to copy
952  *
953  * Copy an existing mode into another mode, zeroing the
954  * list head of the destination mode. Typically used
955  * to guarantee the list head is not left with stack
956  * garbage in on-stack modes.
957  */
drm_mode_init(struct drm_display_mode * dst,const struct drm_display_mode * src)958 void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
959 {
960 	memset(dst, 0, sizeof(*dst));
961 	drm_mode_copy(dst, src);
962 }
963 EXPORT_SYMBOL(drm_mode_init);
964 
965 /**
966  * drm_mode_duplicate - allocate and duplicate an existing mode
967  * @dev: drm_device to allocate the duplicated mode for
968  * @mode: mode to duplicate
969  *
970  * Just allocate a new mode, copy the existing mode into it, and return
971  * a pointer to it.  Used to create new instances of established modes.
972  *
973  * Returns:
974  * Pointer to duplicated mode on success, NULL on error.
975  */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)976 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
977 					    const struct drm_display_mode *mode)
978 {
979 	struct drm_display_mode *nmode;
980 
981 	nmode = drm_mode_create(dev);
982 	if (!nmode)
983 		return NULL;
984 
985 	drm_mode_copy(nmode, mode);
986 
987 	return nmode;
988 }
989 EXPORT_SYMBOL(drm_mode_duplicate);
990 
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)991 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
992 				   const struct drm_display_mode *mode2)
993 {
994 	return mode1->hdisplay == mode2->hdisplay &&
995 		mode1->hsync_start == mode2->hsync_start &&
996 		mode1->hsync_end == mode2->hsync_end &&
997 		mode1->htotal == mode2->htotal &&
998 		mode1->hskew == mode2->hskew &&
999 		mode1->vdisplay == mode2->vdisplay &&
1000 		mode1->vsync_start == mode2->vsync_start &&
1001 		mode1->vsync_end == mode2->vsync_end &&
1002 		mode1->vtotal == mode2->vtotal &&
1003 		mode1->vscan == mode2->vscan;
1004 }
1005 
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1006 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1007 				  const struct drm_display_mode *mode2)
1008 {
1009 	/*
1010 	 * do clock check convert to PICOS
1011 	 * so fb modes get matched the same
1012 	 */
1013 	if (mode1->clock && mode2->clock)
1014 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1015 	else
1016 		return mode1->clock == mode2->clock;
1017 }
1018 
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1019 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1020 				 const struct drm_display_mode *mode2)
1021 {
1022 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1023 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1024 }
1025 
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1026 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1027 				    const struct drm_display_mode *mode2)
1028 {
1029 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1030 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
1031 }
1032 
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1033 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1034 					const struct drm_display_mode *mode2)
1035 {
1036 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1037 }
1038 
1039 /**
1040  * drm_mode_match - test modes for (partial) equality
1041  * @mode1: first mode
1042  * @mode2: second mode
1043  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1044  *
1045  * Check to see if @mode1 and @mode2 are equivalent.
1046  *
1047  * Returns:
1048  * True if the modes are (partially) equal, false otherwise.
1049  */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1050 bool drm_mode_match(const struct drm_display_mode *mode1,
1051 		    const struct drm_display_mode *mode2,
1052 		    unsigned int match_flags)
1053 {
1054 	if (!mode1 && !mode2)
1055 		return true;
1056 
1057 	if (!mode1 || !mode2)
1058 		return false;
1059 
1060 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1061 	    !drm_mode_match_timings(mode1, mode2))
1062 		return false;
1063 
1064 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1065 	    !drm_mode_match_clock(mode1, mode2))
1066 		return false;
1067 
1068 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1069 	    !drm_mode_match_flags(mode1, mode2))
1070 		return false;
1071 
1072 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1073 	    !drm_mode_match_3d_flags(mode1, mode2))
1074 		return false;
1075 
1076 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1077 	    !drm_mode_match_aspect_ratio(mode1, mode2))
1078 		return false;
1079 
1080 	return true;
1081 }
1082 EXPORT_SYMBOL(drm_mode_match);
1083 
1084 /**
1085  * drm_mode_equal - test modes for equality
1086  * @mode1: first mode
1087  * @mode2: second mode
1088  *
1089  * Check to see if @mode1 and @mode2 are equivalent.
1090  *
1091  * Returns:
1092  * True if the modes are equal, false otherwise.
1093  */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1094 bool drm_mode_equal(const struct drm_display_mode *mode1,
1095 		    const struct drm_display_mode *mode2)
1096 {
1097 	return drm_mode_match(mode1, mode2,
1098 			      DRM_MODE_MATCH_TIMINGS |
1099 			      DRM_MODE_MATCH_CLOCK |
1100 			      DRM_MODE_MATCH_FLAGS |
1101 			      DRM_MODE_MATCH_3D_FLAGS|
1102 			      DRM_MODE_MATCH_ASPECT_RATIO);
1103 }
1104 EXPORT_SYMBOL(drm_mode_equal);
1105 
1106 /**
1107  * drm_mode_equal_no_clocks - test modes for equality
1108  * @mode1: first mode
1109  * @mode2: second mode
1110  *
1111  * Check to see if @mode1 and @mode2 are equivalent, but
1112  * don't check the pixel clocks.
1113  *
1114  * Returns:
1115  * True if the modes are equal, false otherwise.
1116  */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1117 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1118 			      const struct drm_display_mode *mode2)
1119 {
1120 	return drm_mode_match(mode1, mode2,
1121 			      DRM_MODE_MATCH_TIMINGS |
1122 			      DRM_MODE_MATCH_FLAGS |
1123 			      DRM_MODE_MATCH_3D_FLAGS);
1124 }
1125 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1126 
1127 /**
1128  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1129  * @mode1: first mode
1130  * @mode2: second mode
1131  *
1132  * Check to see if @mode1 and @mode2 are equivalent, but
1133  * don't check the pixel clocks nor the stereo layout.
1134  *
1135  * Returns:
1136  * True if the modes are equal, false otherwise.
1137  */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1138 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1139 					const struct drm_display_mode *mode2)
1140 {
1141 	return drm_mode_match(mode1, mode2,
1142 			      DRM_MODE_MATCH_TIMINGS |
1143 			      DRM_MODE_MATCH_FLAGS);
1144 }
1145 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1146 
1147 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1148 drm_mode_validate_basic(const struct drm_display_mode *mode)
1149 {
1150 	if (mode->type & ~DRM_MODE_TYPE_ALL)
1151 		return MODE_BAD;
1152 
1153 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1154 		return MODE_BAD;
1155 
1156 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1157 		return MODE_BAD;
1158 
1159 	if (mode->clock == 0)
1160 		return MODE_CLOCK_LOW;
1161 
1162 	if (mode->hdisplay == 0 ||
1163 	    mode->hsync_start < mode->hdisplay ||
1164 	    mode->hsync_end < mode->hsync_start ||
1165 	    mode->htotal < mode->hsync_end)
1166 		return MODE_H_ILLEGAL;
1167 
1168 	if (mode->vdisplay == 0 ||
1169 	    mode->vsync_start < mode->vdisplay ||
1170 	    mode->vsync_end < mode->vsync_start ||
1171 	    mode->vtotal < mode->vsync_end)
1172 		return MODE_V_ILLEGAL;
1173 
1174 	return MODE_OK;
1175 }
1176 
1177 /**
1178  * drm_mode_validate_driver - make sure the mode is somewhat sane
1179  * @dev: drm device
1180  * @mode: mode to check
1181  *
1182  * First do basic validation on the mode, and then allow the driver
1183  * to check for device/driver specific limitations via the optional
1184  * &drm_mode_config_helper_funcs.mode_valid hook.
1185  *
1186  * Returns:
1187  * The mode status
1188  */
1189 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1190 drm_mode_validate_driver(struct drm_device *dev,
1191 			const struct drm_display_mode *mode)
1192 {
1193 	enum drm_mode_status status;
1194 
1195 	status = drm_mode_validate_basic(mode);
1196 	if (status != MODE_OK)
1197 		return status;
1198 
1199 	if (dev->mode_config.funcs->mode_valid)
1200 		return dev->mode_config.funcs->mode_valid(dev, mode);
1201 	else
1202 		return MODE_OK;
1203 }
1204 EXPORT_SYMBOL(drm_mode_validate_driver);
1205 
1206 /**
1207  * drm_mode_validate_size - make sure modes adhere to size constraints
1208  * @mode: mode to check
1209  * @maxX: maximum width
1210  * @maxY: maximum height
1211  *
1212  * This function is a helper which can be used to validate modes against size
1213  * limitations of the DRM device/connector. If a mode is too big its status
1214  * member is updated with the appropriate validation failure code. The list
1215  * itself is not changed.
1216  *
1217  * Returns:
1218  * The mode status
1219  */
1220 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1221 drm_mode_validate_size(const struct drm_display_mode *mode,
1222 		       int maxX, int maxY)
1223 {
1224 	if (maxX > 0 && mode->hdisplay > maxX)
1225 		return MODE_VIRTUAL_X;
1226 
1227 	if (maxY > 0 && mode->vdisplay > maxY)
1228 		return MODE_VIRTUAL_Y;
1229 
1230 	return MODE_OK;
1231 }
1232 EXPORT_SYMBOL(drm_mode_validate_size);
1233 
1234 /**
1235  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1236  * @mode: mode to check
1237  * @connector: drm connector under action
1238  *
1239  * This function is a helper which can be used to filter out any YCBCR420
1240  * only mode, when the source doesn't support it.
1241  *
1242  * Returns:
1243  * The mode status
1244  */
1245 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1246 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1247 			   struct drm_connector *connector)
1248 {
1249 	if (!connector->ycbcr_420_allowed &&
1250 	    drm_mode_is_420_only(&connector->display_info, mode))
1251 		return MODE_NO_420;
1252 
1253 	return MODE_OK;
1254 }
1255 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1256 
1257 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1258 
1259 static const char * const drm_mode_status_names[] = {
1260 	MODE_STATUS(OK),
1261 	MODE_STATUS(HSYNC),
1262 	MODE_STATUS(VSYNC),
1263 	MODE_STATUS(H_ILLEGAL),
1264 	MODE_STATUS(V_ILLEGAL),
1265 	MODE_STATUS(BAD_WIDTH),
1266 	MODE_STATUS(NOMODE),
1267 	MODE_STATUS(NO_INTERLACE),
1268 	MODE_STATUS(NO_DBLESCAN),
1269 	MODE_STATUS(NO_VSCAN),
1270 	MODE_STATUS(MEM),
1271 	MODE_STATUS(VIRTUAL_X),
1272 	MODE_STATUS(VIRTUAL_Y),
1273 	MODE_STATUS(MEM_VIRT),
1274 	MODE_STATUS(NOCLOCK),
1275 	MODE_STATUS(CLOCK_HIGH),
1276 	MODE_STATUS(CLOCK_LOW),
1277 	MODE_STATUS(CLOCK_RANGE),
1278 	MODE_STATUS(BAD_HVALUE),
1279 	MODE_STATUS(BAD_VVALUE),
1280 	MODE_STATUS(BAD_VSCAN),
1281 	MODE_STATUS(HSYNC_NARROW),
1282 	MODE_STATUS(HSYNC_WIDE),
1283 	MODE_STATUS(HBLANK_NARROW),
1284 	MODE_STATUS(HBLANK_WIDE),
1285 	MODE_STATUS(VSYNC_NARROW),
1286 	MODE_STATUS(VSYNC_WIDE),
1287 	MODE_STATUS(VBLANK_NARROW),
1288 	MODE_STATUS(VBLANK_WIDE),
1289 	MODE_STATUS(PANEL),
1290 	MODE_STATUS(INTERLACE_WIDTH),
1291 	MODE_STATUS(ONE_WIDTH),
1292 	MODE_STATUS(ONE_HEIGHT),
1293 	MODE_STATUS(ONE_SIZE),
1294 	MODE_STATUS(NO_REDUCED),
1295 	MODE_STATUS(NO_STEREO),
1296 	MODE_STATUS(NO_420),
1297 	MODE_STATUS(STALE),
1298 	MODE_STATUS(BAD),
1299 	MODE_STATUS(ERROR),
1300 };
1301 
1302 #undef MODE_STATUS
1303 
drm_get_mode_status_name(enum drm_mode_status status)1304 const char *drm_get_mode_status_name(enum drm_mode_status status)
1305 {
1306 	int index = status + 3;
1307 
1308 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1309 		return "";
1310 
1311 	return drm_mode_status_names[index];
1312 }
1313 
1314 /**
1315  * drm_mode_prune_invalid - remove invalid modes from mode list
1316  * @dev: DRM device
1317  * @mode_list: list of modes to check
1318  * @verbose: be verbose about it
1319  *
1320  * This helper function can be used to prune a display mode list after
1321  * validation has been completed. All modes whose status is not MODE_OK will be
1322  * removed from the list, and if @verbose the status code and mode name is also
1323  * printed to dmesg.
1324  */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1325 void drm_mode_prune_invalid(struct drm_device *dev,
1326 			    struct list_head *mode_list, bool verbose)
1327 {
1328 	struct drm_display_mode *mode, *t;
1329 
1330 	list_for_each_entry_safe(mode, t, mode_list, head) {
1331 		if (mode->status != MODE_OK) {
1332 			list_del(&mode->head);
1333 			if (mode->type & DRM_MODE_TYPE_USERDEF) {
1334 				drm_warn(dev, "User-defined mode not supported: "
1335 					 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1336 			}
1337 			if (verbose) {
1338 				drm_mode_debug_printmodeline(mode);
1339 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1340 					      mode->name,
1341 					      drm_get_mode_status_name(mode->status));
1342 			}
1343 			drm_mode_destroy(dev, mode);
1344 		}
1345 	}
1346 }
1347 EXPORT_SYMBOL(drm_mode_prune_invalid);
1348 
1349 /**
1350  * drm_mode_compare - compare modes for favorability
1351  * @priv: unused
1352  * @lh_a: list_head for first mode
1353  * @lh_b: list_head for second mode
1354  *
1355  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1356  * which is better.
1357  *
1358  * Returns:
1359  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1360  * positive if @lh_b is better than @lh_a.
1361  */
drm_mode_compare(void * priv,const struct list_head * lh_a,const struct list_head * lh_b)1362 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1363 			    const struct list_head *lh_b)
1364 {
1365 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1366 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1367 	int diff;
1368 
1369 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1370 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1371 	if (diff)
1372 		return diff;
1373 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1374 	if (diff)
1375 		return diff;
1376 
1377 	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1378 	if (diff)
1379 		return diff;
1380 
1381 	diff = b->clock - a->clock;
1382 	return diff;
1383 }
1384 
1385 /**
1386  * drm_mode_sort - sort mode list
1387  * @mode_list: list of drm_display_mode structures to sort
1388  *
1389  * Sort @mode_list by favorability, moving good modes to the head of the list.
1390  */
drm_mode_sort(struct list_head * mode_list)1391 void drm_mode_sort(struct list_head *mode_list)
1392 {
1393 	list_sort(NULL, mode_list, drm_mode_compare);
1394 }
1395 EXPORT_SYMBOL(drm_mode_sort);
1396 
1397 /**
1398  * drm_connector_list_update - update the mode list for the connector
1399  * @connector: the connector to update
1400  *
1401  * This moves the modes from the @connector probed_modes list
1402  * to the actual mode list. It compares the probed mode against the current
1403  * list and only adds different/new modes.
1404  *
1405  * This is just a helper functions doesn't validate any modes itself and also
1406  * doesn't prune any invalid modes. Callers need to do that themselves.
1407  */
drm_connector_list_update(struct drm_connector * connector)1408 void drm_connector_list_update(struct drm_connector *connector)
1409 {
1410 	struct drm_display_mode *pmode, *pt;
1411 
1412 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1413 
1414 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1415 		struct drm_display_mode *mode;
1416 		bool found_it = false;
1417 
1418 		/* go through current modes checking for the new probed mode */
1419 		list_for_each_entry(mode, &connector->modes, head) {
1420 			if (!drm_mode_equal(pmode, mode))
1421 				continue;
1422 
1423 			found_it = true;
1424 
1425 			/*
1426 			 * If the old matching mode is stale (ie. left over
1427 			 * from a previous probe) just replace it outright.
1428 			 * Otherwise just merge the type bits between all
1429 			 * equal probed modes.
1430 			 *
1431 			 * If two probed modes are considered equal, pick the
1432 			 * actual timings from the one that's marked as
1433 			 * preferred (in case the match isn't 100%). If
1434 			 * multiple or zero preferred modes are present, favor
1435 			 * the mode added to the probed_modes list first.
1436 			 */
1437 			if (mode->status == MODE_STALE) {
1438 				drm_mode_copy(mode, pmode);
1439 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1440 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1441 				pmode->type |= mode->type;
1442 				drm_mode_copy(mode, pmode);
1443 			} else {
1444 				mode->type |= pmode->type;
1445 			}
1446 
1447 			list_del(&pmode->head);
1448 			drm_mode_destroy(connector->dev, pmode);
1449 			break;
1450 		}
1451 
1452 		if (!found_it) {
1453 			list_move_tail(&pmode->head, &connector->modes);
1454 		}
1455 	}
1456 }
1457 EXPORT_SYMBOL(drm_connector_list_update);
1458 
drm_mode_parse_cmdline_bpp(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1459 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1460 				      struct drm_cmdline_mode *mode)
1461 {
1462 	unsigned int bpp;
1463 
1464 	if (str[0] != '-')
1465 		return -EINVAL;
1466 
1467 	str++;
1468 	bpp = simple_strtol(str, end_ptr, 10);
1469 	if (*end_ptr == str)
1470 		return -EINVAL;
1471 
1472 	mode->bpp = bpp;
1473 	mode->bpp_specified = true;
1474 
1475 	return 0;
1476 }
1477 
drm_mode_parse_cmdline_refresh(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1478 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1479 					  struct drm_cmdline_mode *mode)
1480 {
1481 	unsigned int refresh;
1482 
1483 	if (str[0] != '@')
1484 		return -EINVAL;
1485 
1486 	str++;
1487 	refresh = simple_strtol(str, end_ptr, 10);
1488 	if (*end_ptr == str)
1489 		return -EINVAL;
1490 
1491 	mode->refresh = refresh;
1492 	mode->refresh_specified = true;
1493 
1494 	return 0;
1495 }
1496 
drm_mode_parse_cmdline_extra(const char * str,int length,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1497 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1498 					bool freestanding,
1499 					const struct drm_connector *connector,
1500 					struct drm_cmdline_mode *mode)
1501 {
1502 	int i;
1503 
1504 	for (i = 0; i < length; i++) {
1505 		switch (str[i]) {
1506 		case 'i':
1507 			if (freestanding)
1508 				return -EINVAL;
1509 
1510 			mode->interlace = true;
1511 			break;
1512 		case 'm':
1513 			if (freestanding)
1514 				return -EINVAL;
1515 
1516 			mode->margins = true;
1517 			break;
1518 		case 'D':
1519 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1520 				return -EINVAL;
1521 
1522 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1523 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1524 				mode->force = DRM_FORCE_ON;
1525 			else
1526 				mode->force = DRM_FORCE_ON_DIGITAL;
1527 			break;
1528 		case 'd':
1529 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1530 				return -EINVAL;
1531 
1532 			mode->force = DRM_FORCE_OFF;
1533 			break;
1534 		case 'e':
1535 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1536 				return -EINVAL;
1537 
1538 			mode->force = DRM_FORCE_ON;
1539 			break;
1540 		default:
1541 			return -EINVAL;
1542 		}
1543 	}
1544 
1545 	return 0;
1546 }
1547 
drm_mode_parse_cmdline_res_mode(const char * str,unsigned int length,bool extras,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1548 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1549 					   bool extras,
1550 					   const struct drm_connector *connector,
1551 					   struct drm_cmdline_mode *mode)
1552 {
1553 	const char *str_start = str;
1554 	bool rb = false, cvt = false;
1555 	int xres = 0, yres = 0;
1556 	int remaining, i;
1557 	char *end_ptr;
1558 
1559 	xres = simple_strtol(str, &end_ptr, 10);
1560 	if (end_ptr == str)
1561 		return -EINVAL;
1562 
1563 	if (end_ptr[0] != 'x')
1564 		return -EINVAL;
1565 	end_ptr++;
1566 
1567 	str = end_ptr;
1568 	yres = simple_strtol(str, &end_ptr, 10);
1569 	if (end_ptr == str)
1570 		return -EINVAL;
1571 
1572 	remaining = length - (end_ptr - str_start);
1573 	if (remaining < 0)
1574 		return -EINVAL;
1575 
1576 	for (i = 0; i < remaining; i++) {
1577 		switch (end_ptr[i]) {
1578 		case 'M':
1579 			cvt = true;
1580 			break;
1581 		case 'R':
1582 			rb = true;
1583 			break;
1584 		default:
1585 			/*
1586 			 * Try to pass that to our extras parsing
1587 			 * function to handle the case where the
1588 			 * extras are directly after the resolution
1589 			 */
1590 			if (extras) {
1591 				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1592 								       1,
1593 								       false,
1594 								       connector,
1595 								       mode);
1596 				if (ret)
1597 					return ret;
1598 			} else {
1599 				return -EINVAL;
1600 			}
1601 		}
1602 	}
1603 
1604 	mode->xres = xres;
1605 	mode->yres = yres;
1606 	mode->cvt = cvt;
1607 	mode->rb = rb;
1608 
1609 	return 0;
1610 }
1611 
drm_mode_parse_cmdline_int(const char * delim,unsigned int * int_ret)1612 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
1613 {
1614 	const char *value;
1615 	char *endp;
1616 
1617 	/*
1618 	 * delim must point to the '=', otherwise it is a syntax error and
1619 	 * if delim points to the terminating zero, then delim + 1 will point
1620 	 * past the end of the string.
1621 	 */
1622 	if (*delim != '=')
1623 		return -EINVAL;
1624 
1625 	value = delim + 1;
1626 	*int_ret = simple_strtol(value, &endp, 10);
1627 
1628 	/* Make sure we have parsed something */
1629 	if (endp == value)
1630 		return -EINVAL;
1631 
1632 	return 0;
1633 }
1634 
drm_mode_parse_panel_orientation(const char * delim,struct drm_cmdline_mode * mode)1635 static int drm_mode_parse_panel_orientation(const char *delim,
1636 					    struct drm_cmdline_mode *mode)
1637 {
1638 	const char *value;
1639 
1640 	if (*delim != '=')
1641 		return -EINVAL;
1642 
1643 	value = delim + 1;
1644 	delim = strchr(value, ',');
1645 	if (!delim)
1646 		delim = value + strlen(value);
1647 
1648 	if (!strncmp(value, "normal", delim - value))
1649 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1650 	else if (!strncmp(value, "upside_down", delim - value))
1651 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1652 	else if (!strncmp(value, "left_side_up", delim - value))
1653 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
1654 	else if (!strncmp(value, "right_side_up", delim - value))
1655 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
1656 	else
1657 		return -EINVAL;
1658 
1659 	return 0;
1660 }
1661 
drm_mode_parse_cmdline_options(const char * str,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1662 static int drm_mode_parse_cmdline_options(const char *str,
1663 					  bool freestanding,
1664 					  const struct drm_connector *connector,
1665 					  struct drm_cmdline_mode *mode)
1666 {
1667 	unsigned int deg, margin, rotation = 0;
1668 	const char *delim, *option, *sep;
1669 
1670 	option = str;
1671 	do {
1672 		delim = strchr(option, '=');
1673 		if (!delim) {
1674 			delim = strchr(option, ',');
1675 
1676 			if (!delim)
1677 				delim = option + strlen(option);
1678 		}
1679 
1680 		if (!strncmp(option, "rotate", delim - option)) {
1681 			if (drm_mode_parse_cmdline_int(delim, &deg))
1682 				return -EINVAL;
1683 
1684 			switch (deg) {
1685 			case 0:
1686 				rotation |= DRM_MODE_ROTATE_0;
1687 				break;
1688 
1689 			case 90:
1690 				rotation |= DRM_MODE_ROTATE_90;
1691 				break;
1692 
1693 			case 180:
1694 				rotation |= DRM_MODE_ROTATE_180;
1695 				break;
1696 
1697 			case 270:
1698 				rotation |= DRM_MODE_ROTATE_270;
1699 				break;
1700 
1701 			default:
1702 				return -EINVAL;
1703 			}
1704 		} else if (!strncmp(option, "reflect_x", delim - option)) {
1705 			rotation |= DRM_MODE_REFLECT_X;
1706 		} else if (!strncmp(option, "reflect_y", delim - option)) {
1707 			rotation |= DRM_MODE_REFLECT_Y;
1708 		} else if (!strncmp(option, "margin_right", delim - option)) {
1709 			if (drm_mode_parse_cmdline_int(delim, &margin))
1710 				return -EINVAL;
1711 
1712 			mode->tv_margins.right = margin;
1713 		} else if (!strncmp(option, "margin_left", delim - option)) {
1714 			if (drm_mode_parse_cmdline_int(delim, &margin))
1715 				return -EINVAL;
1716 
1717 			mode->tv_margins.left = margin;
1718 		} else if (!strncmp(option, "margin_top", delim - option)) {
1719 			if (drm_mode_parse_cmdline_int(delim, &margin))
1720 				return -EINVAL;
1721 
1722 			mode->tv_margins.top = margin;
1723 		} else if (!strncmp(option, "margin_bottom", delim - option)) {
1724 			if (drm_mode_parse_cmdline_int(delim, &margin))
1725 				return -EINVAL;
1726 
1727 			mode->tv_margins.bottom = margin;
1728 		} else if (!strncmp(option, "panel_orientation", delim - option)) {
1729 			if (drm_mode_parse_panel_orientation(delim, mode))
1730 				return -EINVAL;
1731 		} else {
1732 			return -EINVAL;
1733 		}
1734 		sep = strchr(delim, ',');
1735 		option = sep + 1;
1736 	} while (sep);
1737 
1738 	if (rotation && freestanding)
1739 		return -EINVAL;
1740 
1741 	if (!(rotation & DRM_MODE_ROTATE_MASK))
1742 		rotation |= DRM_MODE_ROTATE_0;
1743 
1744 	/* Make sure there is exactly one rotation defined */
1745 	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
1746 		return -EINVAL;
1747 
1748 	mode->rotation_reflection = rotation;
1749 
1750 	return 0;
1751 }
1752 
1753 static const char * const drm_named_modes_whitelist[] = {
1754 	"NTSC",
1755 	"PAL",
1756 };
1757 
1758 /**
1759  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1760  * @mode_option: optional per connector mode option
1761  * @connector: connector to parse modeline for
1762  * @mode: preallocated drm_cmdline_mode structure to fill out
1763  *
1764  * This parses @mode_option command line modeline for modes and options to
1765  * configure the connector. If @mode_option is NULL the default command line
1766  * modeline in fb_mode_option will be parsed instead.
1767  *
1768  * This uses the same parameters as the fb modedb.c, except for an extra
1769  * force-enable, force-enable-digital and force-disable bit at the end::
1770  *
1771  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1772  *
1773  * Additionals options can be provided following the mode, using a comma to
1774  * separate each option. Valid options can be found in
1775  * Documentation/fb/modedb.rst.
1776  *
1777  * The intermediate drm_cmdline_mode structure is required to store additional
1778  * options from the command line modline like the force-enable/disable flag.
1779  *
1780  * Returns:
1781  * True if a valid modeline has been parsed, false otherwise.
1782  */
drm_mode_parse_command_line_for_connector(const char * mode_option,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1783 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1784 					       const struct drm_connector *connector,
1785 					       struct drm_cmdline_mode *mode)
1786 {
1787 	const char *name;
1788 	bool freestanding = false, parse_extras = false;
1789 	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1790 	unsigned int mode_end = 0;
1791 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1792 	const char *options_ptr = NULL;
1793 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1794 	int i, len, ret;
1795 
1796 	memset(mode, 0, sizeof(*mode));
1797 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
1798 
1799 	if (!mode_option)
1800 		return false;
1801 
1802 	name = mode_option;
1803 
1804 	/* Try to locate the bpp and refresh specifiers, if any */
1805 	bpp_ptr = strchr(name, '-');
1806 	if (bpp_ptr)
1807 		bpp_off = bpp_ptr - name;
1808 
1809 	refresh_ptr = strchr(name, '@');
1810 	if (refresh_ptr)
1811 		refresh_off = refresh_ptr - name;
1812 
1813 	/* Locate the start of named options */
1814 	options_ptr = strchr(name, ',');
1815 	if (options_ptr)
1816 		options_off = options_ptr - name;
1817 
1818 	/* Locate the end of the name / resolution, and parse it */
1819 	if (bpp_ptr) {
1820 		mode_end = bpp_off;
1821 	} else if (refresh_ptr) {
1822 		mode_end = refresh_off;
1823 	} else if (options_ptr) {
1824 		mode_end = options_off;
1825 		parse_extras = true;
1826 	} else {
1827 		mode_end = strlen(name);
1828 		parse_extras = true;
1829 	}
1830 
1831 	/* First check for a named mode */
1832 	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
1833 		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
1834 		if (ret == mode_end) {
1835 			if (refresh_ptr)
1836 				return false; /* named + refresh is invalid */
1837 
1838 			strcpy(mode->name, drm_named_modes_whitelist[i]);
1839 			mode->specified = true;
1840 			break;
1841 		}
1842 	}
1843 
1844 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
1845 	if (!mode->specified && isdigit(name[0])) {
1846 		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1847 						      parse_extras,
1848 						      connector,
1849 						      mode);
1850 		if (ret)
1851 			return false;
1852 
1853 		mode->specified = true;
1854 	}
1855 
1856 	/* No mode? Check for freestanding extras and/or options */
1857 	if (!mode->specified) {
1858 		unsigned int len = strlen(mode_option);
1859 
1860 		if (bpp_ptr || refresh_ptr)
1861 			return false; /* syntax error */
1862 
1863 		if (len == 1 || (len >= 2 && mode_option[1] == ','))
1864 			extra_ptr = mode_option;
1865 		else
1866 			options_ptr = mode_option - 1;
1867 
1868 		freestanding = true;
1869 	}
1870 
1871 	if (bpp_ptr) {
1872 		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1873 		if (ret)
1874 			return false;
1875 
1876 		mode->bpp_specified = true;
1877 	}
1878 
1879 	if (refresh_ptr) {
1880 		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1881 						     &refresh_end_ptr, mode);
1882 		if (ret)
1883 			return false;
1884 
1885 		mode->refresh_specified = true;
1886 	}
1887 
1888 	/*
1889 	 * Locate the end of the bpp / refresh, and parse the extras
1890 	 * if relevant
1891 	 */
1892 	if (bpp_ptr && refresh_ptr)
1893 		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1894 	else if (bpp_ptr)
1895 		extra_ptr = bpp_end_ptr;
1896 	else if (refresh_ptr)
1897 		extra_ptr = refresh_end_ptr;
1898 
1899 	if (extra_ptr) {
1900 		if (options_ptr)
1901 			len = options_ptr - extra_ptr;
1902 		else
1903 			len = strlen(extra_ptr);
1904 
1905 		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
1906 						   connector, mode);
1907 		if (ret)
1908 			return false;
1909 	}
1910 
1911 	if (options_ptr) {
1912 		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
1913 						     freestanding,
1914 						     connector, mode);
1915 		if (ret)
1916 			return false;
1917 	}
1918 
1919 	return true;
1920 }
1921 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1922 
1923 /**
1924  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1925  * @dev: DRM device to create the new mode for
1926  * @cmd: input command line modeline
1927  *
1928  * Returns:
1929  * Pointer to converted mode on success, NULL on error.
1930  */
1931 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1932 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1933 				  struct drm_cmdline_mode *cmd)
1934 {
1935 	struct drm_display_mode *mode;
1936 
1937 	if (cmd->xres == 0 || cmd->yres == 0)
1938 		return NULL;
1939 
1940 	if (cmd->cvt)
1941 		mode = drm_cvt_mode(dev,
1942 				    cmd->xres, cmd->yres,
1943 				    cmd->refresh_specified ? cmd->refresh : 60,
1944 				    cmd->rb, cmd->interlace,
1945 				    cmd->margins);
1946 	else
1947 		mode = drm_gtf_mode(dev,
1948 				    cmd->xres, cmd->yres,
1949 				    cmd->refresh_specified ? cmd->refresh : 60,
1950 				    cmd->interlace,
1951 				    cmd->margins);
1952 	if (!mode)
1953 		return NULL;
1954 
1955 	mode->type |= DRM_MODE_TYPE_USERDEF;
1956 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1957 	if (cmd->xres == 1366)
1958 		drm_mode_fixup_1366x768(mode);
1959 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1960 	return mode;
1961 }
1962 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1963 
1964 /**
1965  * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
1966  * @out: drm_mode_modeinfo struct to return to the user
1967  * @in: drm_display_mode to use
1968  *
1969  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1970  * the user.
1971  */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1972 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1973 			       const struct drm_display_mode *in)
1974 {
1975 	out->clock = in->clock;
1976 	out->hdisplay = in->hdisplay;
1977 	out->hsync_start = in->hsync_start;
1978 	out->hsync_end = in->hsync_end;
1979 	out->htotal = in->htotal;
1980 	out->hskew = in->hskew;
1981 	out->vdisplay = in->vdisplay;
1982 	out->vsync_start = in->vsync_start;
1983 	out->vsync_end = in->vsync_end;
1984 	out->vtotal = in->vtotal;
1985 	out->vscan = in->vscan;
1986 	out->vrefresh = drm_mode_vrefresh(in);
1987 	out->flags = in->flags;
1988 	out->type = in->type;
1989 
1990 	switch (in->picture_aspect_ratio) {
1991 	case HDMI_PICTURE_ASPECT_4_3:
1992 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1993 		break;
1994 	case HDMI_PICTURE_ASPECT_16_9:
1995 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1996 		break;
1997 	case HDMI_PICTURE_ASPECT_64_27:
1998 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1999 		break;
2000 	case HDMI_PICTURE_ASPECT_256_135:
2001 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2002 		break;
2003 	default:
2004 		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2005 		     in->picture_aspect_ratio);
2006 		fallthrough;
2007 	case HDMI_PICTURE_ASPECT_NONE:
2008 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2009 		break;
2010 	}
2011 
2012 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2013 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2014 }
2015 
2016 /**
2017  * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2018  * @dev: drm device
2019  * @out: drm_display_mode to return to the user
2020  * @in: drm_mode_modeinfo to use
2021  *
2022  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2023  * the caller.
2024  *
2025  * Returns:
2026  * Zero on success, negative errno on failure.
2027  */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)2028 int drm_mode_convert_umode(struct drm_device *dev,
2029 			   struct drm_display_mode *out,
2030 			   const struct drm_mode_modeinfo *in)
2031 {
2032 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2033 		return -ERANGE;
2034 
2035 	out->clock = in->clock;
2036 	out->hdisplay = in->hdisplay;
2037 	out->hsync_start = in->hsync_start;
2038 	out->hsync_end = in->hsync_end;
2039 	out->htotal = in->htotal;
2040 	out->hskew = in->hskew;
2041 	out->vdisplay = in->vdisplay;
2042 	out->vsync_start = in->vsync_start;
2043 	out->vsync_end = in->vsync_end;
2044 	out->vtotal = in->vtotal;
2045 	out->vscan = in->vscan;
2046 	out->flags = in->flags;
2047 	/*
2048 	 * Old xf86-video-vmware (possibly others too) used to
2049 	 * leave 'type' uninitialized. Just ignore any bits we
2050 	 * don't like. It's a just hint after all, and more
2051 	 * useful for the kernel->userspace direction anyway.
2052 	 */
2053 	out->type = in->type & DRM_MODE_TYPE_ALL;
2054 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2055 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2056 
2057 	/* Clearing picture aspect ratio bits from out flags,
2058 	 * as the aspect-ratio information is not stored in
2059 	 * flags for kernel-mode, but in picture_aspect_ratio.
2060 	 */
2061 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2062 
2063 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2064 	case DRM_MODE_FLAG_PIC_AR_4_3:
2065 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2066 		break;
2067 	case DRM_MODE_FLAG_PIC_AR_16_9:
2068 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2069 		break;
2070 	case DRM_MODE_FLAG_PIC_AR_64_27:
2071 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2072 		break;
2073 	case DRM_MODE_FLAG_PIC_AR_256_135:
2074 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2075 		break;
2076 	case DRM_MODE_FLAG_PIC_AR_NONE:
2077 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2078 		break;
2079 	default:
2080 		return -EINVAL;
2081 	}
2082 
2083 	out->status = drm_mode_validate_driver(dev, out);
2084 	if (out->status != MODE_OK)
2085 		return -EINVAL;
2086 
2087 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2088 
2089 	return 0;
2090 }
2091 
2092 /**
2093  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2094  * output format
2095  *
2096  * @display: display under action
2097  * @mode: video mode to be tested.
2098  *
2099  * Returns:
2100  * true if the mode can be supported in YCBCR420 format
2101  * false if not.
2102  */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)2103 bool drm_mode_is_420_only(const struct drm_display_info *display,
2104 			  const struct drm_display_mode *mode)
2105 {
2106 	u8 vic = drm_match_cea_mode(mode);
2107 
2108 	return test_bit(vic, display->hdmi.y420_vdb_modes);
2109 }
2110 EXPORT_SYMBOL(drm_mode_is_420_only);
2111 
2112 /**
2113  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2114  * output format also (along with RGB/YCBCR444/422)
2115  *
2116  * @display: display under action.
2117  * @mode: video mode to be tested.
2118  *
2119  * Returns:
2120  * true if the mode can be support YCBCR420 format
2121  * false if not.
2122  */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)2123 bool drm_mode_is_420_also(const struct drm_display_info *display,
2124 			  const struct drm_display_mode *mode)
2125 {
2126 	u8 vic = drm_match_cea_mode(mode);
2127 
2128 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2129 }
2130 EXPORT_SYMBOL(drm_mode_is_420_also);
2131 /**
2132  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2133  * output format
2134  *
2135  * @display: display under action.
2136  * @mode: video mode to be tested.
2137  *
2138  * Returns:
2139  * true if the mode can be supported in YCBCR420 format
2140  * false if not.
2141  */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)2142 bool drm_mode_is_420(const struct drm_display_info *display,
2143 		     const struct drm_display_mode *mode)
2144 {
2145 	return drm_mode_is_420_only(display, mode) ||
2146 		drm_mode_is_420_also(display, mode);
2147 }
2148 EXPORT_SYMBOL(drm_mode_is_420);
2149