xref: /linux/drivers/gpu/drm/drm_modes.c (revision 2c1ed907520c50326b8f604907a8478b27881a2e)
1 /*
2  * Copyright © 1997-2003 by The XFree86 Project, Inc.
3  * Copyright © 2007 Dave Airlie
4  * Copyright © 2007-2008 Intel Corporation
5  *   Jesse Barnes <jesse.barnes@intel.com>
6  * Copyright 2005-2006 Luc Verhaegen
7  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included in
17  * all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25  * OTHER DEALINGS IN THE SOFTWARE.
26  *
27  * Except as contained in this notice, the name of the copyright holder(s)
28  * and author(s) shall not be used in advertising or otherwise to promote
29  * the sale, use or other dealings in this Software without prior written
30  * authorization from the copyright holder(s) and author(s).
31  */
32 
33 #include <linux/ctype.h>
34 #include <linux/export.h>
35 #include <linux/fb.h> /* for KHZ2PICOS() */
36 #include <linux/list.h>
37 #include <linux/list_sort.h>
38 #include <linux/of.h>
39 
40 #include <video/of_display_timing.h>
41 #include <video/of_videomode.h>
42 #include <video/videomode.h>
43 
44 #include <drm/drm_crtc.h>
45 #include <drm/drm_device.h>
46 #include <drm/drm_edid.h>
47 #include <drm/drm_modes.h>
48 #include <drm/drm_print.h>
49 
50 #include "drm_crtc_internal.h"
51 
52 /**
53  * drm_mode_debug_printmodeline - print a mode to dmesg
54  * @mode: mode to print
55  *
56  * Describe @mode using DRM_DEBUG.
57  */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)58 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
59 {
60 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
61 }
62 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
63 
64 /**
65  * drm_mode_create - create a new display mode
66  * @dev: DRM device
67  *
68  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
69  * and return it.
70  *
71  * Returns:
72  * Pointer to new mode on success, NULL on error.
73  */
drm_mode_create(struct drm_device * dev)74 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
75 {
76 	struct drm_display_mode *nmode;
77 
78 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
79 	if (!nmode)
80 		return NULL;
81 
82 	return nmode;
83 }
84 EXPORT_SYMBOL(drm_mode_create);
85 
86 /**
87  * drm_mode_destroy - remove a mode
88  * @dev: DRM device
89  * @mode: mode to remove
90  *
91  * Release @mode's unique ID, then free it @mode structure itself using kfree.
92  */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)93 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
94 {
95 	if (!mode)
96 		return;
97 
98 	kfree(mode);
99 }
100 EXPORT_SYMBOL(drm_mode_destroy);
101 
102 /**
103  * drm_mode_probed_add - add a mode to a connector's probed_mode list
104  * @connector: connector the new mode
105  * @mode: mode data
106  *
107  * Add @mode to @connector's probed_mode list for later use. This list should
108  * then in a second step get filtered and all the modes actually supported by
109  * the hardware moved to the @connector's modes list.
110  */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)111 void drm_mode_probed_add(struct drm_connector *connector,
112 			 struct drm_display_mode *mode)
113 {
114 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
115 
116 	list_add_tail(&mode->head, &connector->probed_modes);
117 }
118 EXPORT_SYMBOL(drm_mode_probed_add);
119 
120 enum drm_mode_analog {
121 	DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
122 	DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
123 };
124 
125 /*
126  * The timings come from:
127  * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
128  * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
129  * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
130  */
131 #define NTSC_LINE_DURATION_NS		63556U
132 #define NTSC_LINES_NUMBER		525
133 
134 #define NTSC_HBLK_DURATION_TYP_NS	10900U
135 #define NTSC_HBLK_DURATION_MIN_NS	(NTSC_HBLK_DURATION_TYP_NS - 200)
136 #define NTSC_HBLK_DURATION_MAX_NS	(NTSC_HBLK_DURATION_TYP_NS + 200)
137 
138 #define NTSC_HACT_DURATION_TYP_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
139 #define NTSC_HACT_DURATION_MIN_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
140 #define NTSC_HACT_DURATION_MAX_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
141 
142 #define NTSC_HFP_DURATION_TYP_NS	1500
143 #define NTSC_HFP_DURATION_MIN_NS	1270
144 #define NTSC_HFP_DURATION_MAX_NS	2220
145 
146 #define NTSC_HSLEN_DURATION_TYP_NS	4700
147 #define NTSC_HSLEN_DURATION_MIN_NS	(NTSC_HSLEN_DURATION_TYP_NS - 100)
148 #define NTSC_HSLEN_DURATION_MAX_NS	(NTSC_HSLEN_DURATION_TYP_NS + 100)
149 
150 #define NTSC_HBP_DURATION_TYP_NS	4700
151 
152 /*
153  * I couldn't find the actual tolerance for the back porch, so let's
154  * just reuse the sync length ones.
155  */
156 #define NTSC_HBP_DURATION_MIN_NS	(NTSC_HBP_DURATION_TYP_NS - 100)
157 #define NTSC_HBP_DURATION_MAX_NS	(NTSC_HBP_DURATION_TYP_NS + 100)
158 
159 #define PAL_LINE_DURATION_NS		64000U
160 #define PAL_LINES_NUMBER		625
161 
162 #define PAL_HACT_DURATION_TYP_NS	51950U
163 #define PAL_HACT_DURATION_MIN_NS	(PAL_HACT_DURATION_TYP_NS - 100)
164 #define PAL_HACT_DURATION_MAX_NS	(PAL_HACT_DURATION_TYP_NS + 400)
165 
166 #define PAL_HBLK_DURATION_TYP_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
167 #define PAL_HBLK_DURATION_MIN_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
168 #define PAL_HBLK_DURATION_MAX_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
169 
170 #define PAL_HFP_DURATION_TYP_NS		1650
171 #define PAL_HFP_DURATION_MIN_NS		(PAL_HFP_DURATION_TYP_NS - 100)
172 #define PAL_HFP_DURATION_MAX_NS		(PAL_HFP_DURATION_TYP_NS + 400)
173 
174 #define PAL_HSLEN_DURATION_TYP_NS	4700
175 #define PAL_HSLEN_DURATION_MIN_NS	(PAL_HSLEN_DURATION_TYP_NS - 200)
176 #define PAL_HSLEN_DURATION_MAX_NS	(PAL_HSLEN_DURATION_TYP_NS + 200)
177 
178 #define PAL_HBP_DURATION_TYP_NS		5700
179 #define PAL_HBP_DURATION_MIN_NS		(PAL_HBP_DURATION_TYP_NS - 200)
180 #define PAL_HBP_DURATION_MAX_NS		(PAL_HBP_DURATION_TYP_NS + 200)
181 
182 struct analog_param_field {
183 	unsigned int even, odd;
184 };
185 
186 #define PARAM_FIELD(_odd, _even)		\
187 	{ .even = _even, .odd = _odd }
188 
189 struct analog_param_range {
190 	unsigned int	min, typ, max;
191 };
192 
193 #define PARAM_RANGE(_min, _typ, _max)		\
194 	{ .min = _min, .typ = _typ, .max = _max }
195 
196 struct analog_parameters {
197 	unsigned int			num_lines;
198 	unsigned int			line_duration_ns;
199 
200 	struct analog_param_range	hact_ns;
201 	struct analog_param_range	hfp_ns;
202 	struct analog_param_range	hslen_ns;
203 	struct analog_param_range	hbp_ns;
204 	struct analog_param_range	hblk_ns;
205 
206 	unsigned int			bt601_hfp;
207 
208 	struct analog_param_field	vfp_lines;
209 	struct analog_param_field	vslen_lines;
210 	struct analog_param_field	vbp_lines;
211 };
212 
213 #define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp,	\
214 			  _hslen, _hbp, _hblk, _bt601_hfp, _vfp,	\
215 			  _vslen, _vbp)					\
216 	[_mode] = {							\
217 		.num_lines = _lines,					\
218 		.line_duration_ns = _line_dur,				\
219 		.hact_ns = _hact,					\
220 		.hfp_ns = _hfp,						\
221 		.hslen_ns = _hslen,					\
222 		.hbp_ns = _hbp,						\
223 		.hblk_ns = _hblk,					\
224 		.bt601_hfp = _bt601_hfp,				\
225 		.vfp_lines = _vfp,					\
226 		.vslen_lines = _vslen,					\
227 		.vbp_lines = _vbp,					\
228 	}
229 
230 static const struct analog_parameters tv_modes_parameters[] = {
231 	TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
232 			  NTSC_LINES_NUMBER,
233 			  NTSC_LINE_DURATION_NS,
234 			  PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
235 				      NTSC_HACT_DURATION_TYP_NS,
236 				      NTSC_HACT_DURATION_MAX_NS),
237 			  PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
238 				      NTSC_HFP_DURATION_TYP_NS,
239 				      NTSC_HFP_DURATION_MAX_NS),
240 			  PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
241 				      NTSC_HSLEN_DURATION_TYP_NS,
242 				      NTSC_HSLEN_DURATION_MAX_NS),
243 			  PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
244 				      NTSC_HBP_DURATION_TYP_NS,
245 				      NTSC_HBP_DURATION_MAX_NS),
246 			  PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
247 				      NTSC_HBLK_DURATION_TYP_NS,
248 				      NTSC_HBLK_DURATION_MAX_NS),
249 			  16,
250 			  PARAM_FIELD(3, 3),
251 			  PARAM_FIELD(3, 3),
252 			  PARAM_FIELD(16, 17)),
253 	TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
254 			  PAL_LINES_NUMBER,
255 			  PAL_LINE_DURATION_NS,
256 			  PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
257 				      PAL_HACT_DURATION_TYP_NS,
258 				      PAL_HACT_DURATION_MAX_NS),
259 			  PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
260 				      PAL_HFP_DURATION_TYP_NS,
261 				      PAL_HFP_DURATION_MAX_NS),
262 			  PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
263 				      PAL_HSLEN_DURATION_TYP_NS,
264 				      PAL_HSLEN_DURATION_MAX_NS),
265 			  PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
266 				      PAL_HBP_DURATION_TYP_NS,
267 				      PAL_HBP_DURATION_MAX_NS),
268 			  PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
269 				      PAL_HBLK_DURATION_TYP_NS,
270 				      PAL_HBLK_DURATION_MAX_NS),
271 			  12,
272 
273 			  /*
274 			   * The front porch is actually 6 short sync
275 			   * pulses for the even field, and 5 for the
276 			   * odd field. Each sync takes half a life so
277 			   * the odd field front porch is shorter by
278 			   * half a line.
279 			   *
280 			   * In progressive, we're supposed to use 6
281 			   * pulses, so we're fine there
282 			   */
283 			  PARAM_FIELD(3, 2),
284 
285 			  /*
286 			   * The vsync length is 5 long sync pulses,
287 			   * each field taking half a line. We're
288 			   * shorter for both fields by half a line.
289 			   *
290 			   * In progressive, we're supposed to use 5
291 			   * pulses, so we're off by half
292 			   * a line.
293 			   *
294 			   * In interlace, we're now off by half a line
295 			   * for the even field and one line for the odd
296 			   * field.
297 			   */
298 			  PARAM_FIELD(3, 3),
299 
300 			  /*
301 			   * The back porch starts with post-equalizing
302 			   * pulses, consisting in 5 short sync pulses
303 			   * for the even field, 4 for the odd field. In
304 			   * progressive, it's 5 short syncs.
305 			   *
306 			   * In progressive, we thus have 2.5 lines,
307 			   * plus the 0.5 line we were missing
308 			   * previously, so we should use 3 lines.
309 			   *
310 			   * In interlace, the even field is in the
311 			   * exact same case than progressive. For the
312 			   * odd field, we should be using 2 lines but
313 			   * we're one line short, so we'll make up for
314 			   * it here by using 3.
315 			   *
316 			   * The entire blanking area is supposed to
317 			   * take 25 lines, so we also need to account
318 			   * for the rest of the blanking area that
319 			   * can't be in either the front porch or sync
320 			   * period.
321 			   */
322 			  PARAM_FIELD(19, 20)),
323 };
324 
fill_analog_mode(struct drm_device * dev,struct drm_display_mode * mode,const struct analog_parameters * params,unsigned long pixel_clock_hz,unsigned int hactive,unsigned int vactive,bool interlace)325 static int fill_analog_mode(struct drm_device *dev,
326 			    struct drm_display_mode *mode,
327 			    const struct analog_parameters *params,
328 			    unsigned long pixel_clock_hz,
329 			    unsigned int hactive,
330 			    unsigned int vactive,
331 			    bool interlace)
332 {
333 	unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
334 	unsigned int htotal, vtotal;
335 	unsigned int max_hact, hact_duration_ns;
336 	unsigned int hblk, hblk_duration_ns;
337 	unsigned int hfp, hfp_duration_ns;
338 	unsigned int hslen, hslen_duration_ns;
339 	unsigned int hbp, hbp_duration_ns;
340 	unsigned int porches, porches_duration_ns;
341 	unsigned int vfp, vfp_min;
342 	unsigned int vbp, vbp_min;
343 	unsigned int vslen;
344 	bool bt601 = false;
345 	int porches_rem;
346 	u64 result;
347 
348 	drm_dbg_kms(dev,
349 		    "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
350 		    hactive, vactive,
351 		    interlace ? 'i' : 'p',
352 		    params->num_lines,
353 		    pixel_clock_hz / 1000);
354 
355 	max_hact = params->hact_ns.max / pixel_duration_ns;
356 	if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
357 		drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
358 		bt601 = true;
359 	}
360 
361 	/*
362 	 * Our pixel duration is going to be round down by the division,
363 	 * so rounding up is probably going to introduce even more
364 	 * deviation.
365 	 */
366 	result = (u64)params->line_duration_ns * pixel_clock_hz;
367 	do_div(result, NSEC_PER_SEC);
368 	htotal = result;
369 
370 	drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
371 
372 	hact_duration_ns = hactive * pixel_duration_ns;
373 	if (!bt601 &&
374 	    (hact_duration_ns < params->hact_ns.min ||
375 	     hact_duration_ns > params->hact_ns.max)) {
376 		drm_err(dev, "Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
377 			hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
378 		return -EINVAL;
379 	}
380 
381 	hblk = htotal - hactive;
382 	drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
383 
384 	hblk_duration_ns = hblk * pixel_duration_ns;
385 	if (!bt601 &&
386 	    (hblk_duration_ns < params->hblk_ns.min ||
387 	     hblk_duration_ns > params->hblk_ns.max)) {
388 		drm_err(dev, "Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
389 			hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
390 		return -EINVAL;
391 	}
392 
393 	hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
394 	drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
395 
396 	hslen_duration_ns = hslen * pixel_duration_ns;
397 	if (!bt601 &&
398 	    (hslen_duration_ns < params->hslen_ns.min ||
399 	     hslen_duration_ns > params->hslen_ns.max)) {
400 		drm_err(dev, "Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
401 			hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
402 		return -EINVAL;
403 	}
404 
405 	porches = hblk - hslen;
406 	drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
407 
408 	porches_duration_ns = porches * pixel_duration_ns;
409 	if (!bt601 &&
410 	    (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
411 	     porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
412 		drm_err(dev, "Invalid horizontal porches duration: %uns\n",
413 			porches_duration_ns);
414 		return -EINVAL;
415 	}
416 
417 	if (bt601) {
418 		hfp = params->bt601_hfp;
419 	} else {
420 		unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
421 						    pixel_duration_ns);
422 		unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
423 						    pixel_duration_ns);
424 		int porches_rem = porches - hfp_min - hbp_min;
425 
426 		hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
427 	}
428 
429 	drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
430 
431 	hfp_duration_ns = hfp * pixel_duration_ns;
432 	if (!bt601 &&
433 	    (hfp_duration_ns < params->hfp_ns.min ||
434 	     hfp_duration_ns > params->hfp_ns.max)) {
435 		drm_err(dev, "Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
436 			hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
437 		return -EINVAL;
438 	}
439 
440 	hbp = porches - hfp;
441 	drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
442 
443 	hbp_duration_ns = hbp * pixel_duration_ns;
444 	if (!bt601 &&
445 	    (hbp_duration_ns < params->hbp_ns.min ||
446 	     hbp_duration_ns > params->hbp_ns.max)) {
447 		drm_err(dev, "Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
448 			hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
449 		return -EINVAL;
450 	}
451 
452 	if (htotal != (hactive + hfp + hslen + hbp))
453 		return -EINVAL;
454 
455 	mode->clock = pixel_clock_hz / 1000;
456 	mode->hdisplay = hactive;
457 	mode->hsync_start = mode->hdisplay + hfp;
458 	mode->hsync_end = mode->hsync_start + hslen;
459 	mode->htotal = mode->hsync_end + hbp;
460 
461 	if (interlace) {
462 		vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
463 		vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
464 		vslen = params->vslen_lines.even + params->vslen_lines.odd;
465 	} else {
466 		/*
467 		 * By convention, NTSC (aka 525/60) systems start with
468 		 * the even field, but PAL (aka 625/50) systems start
469 		 * with the odd one.
470 		 *
471 		 * PAL systems also have asymmetric timings between the
472 		 * even and odd field, while NTSC is symmetric.
473 		 *
474 		 * Moreover, if we want to create a progressive mode for
475 		 * PAL, we need to use the odd field timings.
476 		 *
477 		 * Since odd == even for NTSC, we can just use the odd
478 		 * one all the time to simplify the code a bit.
479 		 */
480 		vfp_min = params->vfp_lines.odd;
481 		vbp_min = params->vbp_lines.odd;
482 		vslen = params->vslen_lines.odd;
483 	}
484 
485 	drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
486 
487 	porches = params->num_lines - vactive - vslen;
488 	drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
489 
490 	porches_rem = porches - vfp_min - vbp_min;
491 	vfp = vfp_min + (porches_rem / 2);
492 	drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
493 
494 	vbp = porches - vfp;
495 	drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
496 
497 	vtotal = vactive + vfp + vslen + vbp;
498 	if (params->num_lines != vtotal) {
499 		drm_err(dev, "Invalid vertical total: %upx (expected %upx)\n",
500 			vtotal, params->num_lines);
501 		return -EINVAL;
502 	}
503 
504 	mode->vdisplay = vactive;
505 	mode->vsync_start = mode->vdisplay + vfp;
506 	mode->vsync_end = mode->vsync_start + vslen;
507 	mode->vtotal = mode->vsync_end + vbp;
508 
509 	if (mode->vtotal != params->num_lines)
510 		return -EINVAL;
511 
512 	mode->type = DRM_MODE_TYPE_DRIVER;
513 	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
514 	if (interlace)
515 		mode->flags |= DRM_MODE_FLAG_INTERLACE;
516 
517 	drm_mode_set_name(mode);
518 
519 	drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
520 
521 	return 0;
522 }
523 
524 /**
525  * drm_analog_tv_mode - create a display mode for an analog TV
526  * @dev: drm device
527  * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
528  * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
529  * @hdisplay: hdisplay size
530  * @vdisplay: vdisplay size
531  * @interlace: whether to compute an interlaced mode
532  *
533  * This function creates a struct drm_display_mode instance suited for
534  * an analog TV output, for one of the usual analog TV modes. Where
535  * this is DRM_MODE_TV_MODE_MONOCHROME, a 625-line mode will be created.
536  *
537  * Note that @hdisplay is larger than the usual constraints for the PAL
538  * and NTSC timings, and we'll choose to ignore most timings constraints
539  * to reach those resolutions.
540  *
541  * Returns:
542  * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
543  * on error.
544  */
drm_analog_tv_mode(struct drm_device * dev,enum drm_connector_tv_mode tv_mode,unsigned long pixel_clock_hz,unsigned int hdisplay,unsigned int vdisplay,bool interlace)545 struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
546 					    enum drm_connector_tv_mode tv_mode,
547 					    unsigned long pixel_clock_hz,
548 					    unsigned int hdisplay,
549 					    unsigned int vdisplay,
550 					    bool interlace)
551 {
552 	struct drm_display_mode *mode;
553 	enum drm_mode_analog analog;
554 	int ret;
555 
556 	switch (tv_mode) {
557 	case DRM_MODE_TV_MODE_NTSC:
558 		fallthrough;
559 	case DRM_MODE_TV_MODE_NTSC_443:
560 		fallthrough;
561 	case DRM_MODE_TV_MODE_NTSC_J:
562 		fallthrough;
563 	case DRM_MODE_TV_MODE_PAL_M:
564 		analog = DRM_MODE_ANALOG_NTSC;
565 		break;
566 
567 	case DRM_MODE_TV_MODE_PAL:
568 		fallthrough;
569 	case DRM_MODE_TV_MODE_PAL_N:
570 		fallthrough;
571 	case DRM_MODE_TV_MODE_SECAM:
572 		fallthrough;
573 	case DRM_MODE_TV_MODE_MONOCHROME:
574 		analog = DRM_MODE_ANALOG_PAL;
575 		break;
576 
577 	default:
578 		return NULL;
579 	}
580 
581 	mode = drm_mode_create(dev);
582 	if (!mode)
583 		return NULL;
584 
585 	ret = fill_analog_mode(dev, mode,
586 			       &tv_modes_parameters[analog],
587 			       pixel_clock_hz, hdisplay, vdisplay, interlace);
588 	if (ret)
589 		goto err_free_mode;
590 
591 	return mode;
592 
593 err_free_mode:
594 	drm_mode_destroy(dev, mode);
595 	return NULL;
596 }
597 EXPORT_SYMBOL(drm_analog_tv_mode);
598 
599 /**
600  * drm_cvt_mode -create a modeline based on the CVT algorithm
601  * @dev: drm device
602  * @hdisplay: hdisplay size
603  * @vdisplay: vdisplay size
604  * @vrefresh: vrefresh rate
605  * @reduced: whether to use reduced blanking
606  * @interlaced: whether to compute an interlaced mode
607  * @margins: whether to add margins (borders)
608  *
609  * This function is called to generate the modeline based on CVT algorithm
610  * according to the hdisplay, vdisplay, vrefresh.
611  * It is based from the VESA(TM) Coordinated Video Timing Generator by
612  * Graham Loveridge April 9, 2003 available at
613  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
614  *
615  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
616  * What I have done is to translate it by using integer calculation.
617  *
618  * Returns:
619  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
620  * The display mode object is allocated with drm_mode_create(). Returns NULL
621  * when no mode could be allocated.
622  */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)623 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
624 				      int vdisplay, int vrefresh,
625 				      bool reduced, bool interlaced, bool margins)
626 {
627 #define HV_FACTOR			1000
628 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
629 #define	CVT_MARGIN_PERCENTAGE		18
630 	/* 2) character cell horizontal granularity (pixels) - default 8 */
631 #define	CVT_H_GRANULARITY		8
632 	/* 3) Minimum vertical porch (lines) - default 3 */
633 #define	CVT_MIN_V_PORCH			3
634 	/* 4) Minimum number of vertical back porch lines - default 6 */
635 #define	CVT_MIN_V_BPORCH		6
636 	/* Pixel Clock step (kHz) */
637 #define CVT_CLOCK_STEP			250
638 	struct drm_display_mode *drm_mode;
639 	unsigned int vfieldrate, hperiod;
640 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
641 	int interlace;
642 	u64 tmp;
643 
644 	if (!hdisplay || !vdisplay)
645 		return NULL;
646 
647 	/* allocate the drm_display_mode structure. If failure, we will
648 	 * return directly
649 	 */
650 	drm_mode = drm_mode_create(dev);
651 	if (!drm_mode)
652 		return NULL;
653 
654 	/* the CVT default refresh rate is 60Hz */
655 	if (!vrefresh)
656 		vrefresh = 60;
657 
658 	/* the required field fresh rate */
659 	if (interlaced)
660 		vfieldrate = vrefresh * 2;
661 	else
662 		vfieldrate = vrefresh;
663 
664 	/* horizontal pixels */
665 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
666 
667 	/* determine the left&right borders */
668 	hmargin = 0;
669 	if (margins) {
670 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
671 		hmargin -= hmargin % CVT_H_GRANULARITY;
672 	}
673 	/* find the total active pixels */
674 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
675 
676 	/* find the number of lines per field */
677 	if (interlaced)
678 		vdisplay_rnd = vdisplay / 2;
679 	else
680 		vdisplay_rnd = vdisplay;
681 
682 	/* find the top & bottom borders */
683 	vmargin = 0;
684 	if (margins)
685 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
686 
687 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
688 
689 	/* Interlaced */
690 	if (interlaced)
691 		interlace = 1;
692 	else
693 		interlace = 0;
694 
695 	/* Determine VSync Width from aspect ratio */
696 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
697 		vsync = 4;
698 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
699 		vsync = 5;
700 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
701 		vsync = 6;
702 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
703 		vsync = 7;
704 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
705 		vsync = 7;
706 	else /* custom */
707 		vsync = 10;
708 
709 	if (!reduced) {
710 		/* simplify the GTF calculation */
711 		/* 4) Minimum time of vertical sync + back porch interval (µs)
712 		 * default 550.0
713 		 */
714 		int tmp1, tmp2;
715 #define CVT_MIN_VSYNC_BP	550
716 		/* 3) Nominal HSync width (% of line period) - default 8 */
717 #define CVT_HSYNC_PERCENTAGE	8
718 		unsigned int hblank_percentage;
719 		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
720 
721 		/* estimated the horizontal period */
722 		tmp1 = HV_FACTOR * 1000000  -
723 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
724 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
725 				interlace;
726 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
727 
728 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
729 		/* 9. Find number of lines in sync + backporch */
730 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
731 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
732 		else
733 			vsyncandback_porch = tmp1;
734 		/* 10. Find number of lines in back porch */
735 		vback_porch = vsyncandback_porch - vsync;
736 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
737 				vsyncandback_porch + CVT_MIN_V_PORCH;
738 		/* 5) Definition of Horizontal blanking time limitation */
739 		/* Gradient (%/kHz) - default 600 */
740 #define CVT_M_FACTOR	600
741 		/* Offset (%) - default 40 */
742 #define CVT_C_FACTOR	40
743 		/* Blanking time scaling factor - default 128 */
744 #define CVT_K_FACTOR	128
745 		/* Scaling factor weighting - default 20 */
746 #define CVT_J_FACTOR	20
747 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
748 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
749 			 CVT_J_FACTOR)
750 		/* 12. Find ideal blanking duty cycle from formula */
751 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
752 					hperiod / 1000;
753 		/* 13. Blanking time */
754 		if (hblank_percentage < 20 * HV_FACTOR)
755 			hblank_percentage = 20 * HV_FACTOR;
756 		hblank = drm_mode->hdisplay * hblank_percentage /
757 			 (100 * HV_FACTOR - hblank_percentage);
758 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
759 		/* 14. find the total pixels per line */
760 		drm_mode->htotal = drm_mode->hdisplay + hblank;
761 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
762 		drm_mode->hsync_start = drm_mode->hsync_end -
763 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
764 		drm_mode->hsync_start += CVT_H_GRANULARITY -
765 			drm_mode->hsync_start % CVT_H_GRANULARITY;
766 		/* fill the Vsync values */
767 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
768 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
769 	} else {
770 		/* Reduced blanking */
771 		/* Minimum vertical blanking interval time (µs)- default 460 */
772 #define CVT_RB_MIN_VBLANK	460
773 		/* Fixed number of clocks for horizontal sync */
774 #define CVT_RB_H_SYNC		32
775 		/* Fixed number of clocks for horizontal blanking */
776 #define CVT_RB_H_BLANK		160
777 		/* Fixed number of lines for vertical front porch - default 3*/
778 #define CVT_RB_VFPORCH		3
779 		int vbilines;
780 		int tmp1, tmp2;
781 		/* 8. Estimate Horizontal period. */
782 		tmp1 = HV_FACTOR * 1000000 -
783 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
784 		tmp2 = vdisplay_rnd + 2 * vmargin;
785 		hperiod = tmp1 / (tmp2 * vfieldrate);
786 		/* 9. Find number of lines in vertical blanking */
787 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
788 		/* 10. Check if vertical blanking is sufficient */
789 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
790 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
791 		/* 11. Find total number of lines in vertical field */
792 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
793 		/* 12. Find total number of pixels in a line */
794 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
795 		/* Fill in HSync values */
796 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
797 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
798 		/* Fill in VSync values */
799 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
800 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
801 	}
802 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
803 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
804 	tmp *= HV_FACTOR * 1000;
805 	do_div(tmp, hperiod);
806 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
807 	drm_mode->clock = tmp;
808 	/* 18/16. Find actual vertical frame frequency */
809 	/* ignore - just set the mode flag for interlaced */
810 	if (interlaced) {
811 		drm_mode->vtotal *= 2;
812 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
813 	}
814 	/* Fill the mode line name */
815 	drm_mode_set_name(drm_mode);
816 	if (reduced)
817 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
818 					DRM_MODE_FLAG_NVSYNC);
819 	else
820 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
821 					DRM_MODE_FLAG_NHSYNC);
822 
823 	return drm_mode;
824 }
825 EXPORT_SYMBOL(drm_cvt_mode);
826 
827 /**
828  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
829  * @dev: drm device
830  * @hdisplay: hdisplay size
831  * @vdisplay: vdisplay size
832  * @vrefresh: vrefresh rate.
833  * @interlaced: whether to compute an interlaced mode
834  * @margins: desired margin (borders) size
835  * @GTF_M: extended GTF formula parameters
836  * @GTF_2C: extended GTF formula parameters
837  * @GTF_K: extended GTF formula parameters
838  * @GTF_2J: extended GTF formula parameters
839  *
840  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
841  * in here multiplied by two.  For a C of 40, pass in 80.
842  *
843  * Returns:
844  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
845  * The display mode object is allocated with drm_mode_create(). Returns NULL
846  * when no mode could be allocated.
847  */
848 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)849 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
850 		     int vrefresh, bool interlaced, int margins,
851 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
852 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
853 #define	GTF_MARGIN_PERCENTAGE		18
854 	/* 2) character cell horizontal granularity (pixels) - default 8 */
855 #define	GTF_CELL_GRAN			8
856 	/* 3) Minimum vertical porch (lines) - default 3 */
857 #define	GTF_MIN_V_PORCH			1
858 	/* width of vsync in lines */
859 #define V_SYNC_RQD			3
860 	/* width of hsync as % of total line */
861 #define H_SYNC_PERCENT			8
862 	/* min time of vsync + back porch (microsec) */
863 #define MIN_VSYNC_PLUS_BP		550
864 	/* C' and M' are part of the Blanking Duty Cycle computation */
865 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
866 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
867 	struct drm_display_mode *drm_mode;
868 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
869 	int top_margin, bottom_margin;
870 	int interlace;
871 	unsigned int hfreq_est;
872 	int vsync_plus_bp, __maybe_unused vback_porch;
873 	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
874 	unsigned int __maybe_unused hperiod;
875 	unsigned int vfield_rate, __maybe_unused vframe_rate;
876 	int left_margin, right_margin;
877 	unsigned int total_active_pixels, ideal_duty_cycle;
878 	unsigned int hblank, total_pixels, pixel_freq;
879 	int hsync, hfront_porch, vodd_front_porch_lines;
880 	unsigned int tmp1, tmp2;
881 
882 	if (!hdisplay || !vdisplay)
883 		return NULL;
884 
885 	drm_mode = drm_mode_create(dev);
886 	if (!drm_mode)
887 		return NULL;
888 
889 	/* 1. In order to give correct results, the number of horizontal
890 	 * pixels requested is first processed to ensure that it is divisible
891 	 * by the character size, by rounding it to the nearest character
892 	 * cell boundary:
893 	 */
894 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
895 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
896 
897 	/* 2. If interlace is requested, the number of vertical lines assumed
898 	 * by the calculation must be halved, as the computation calculates
899 	 * the number of vertical lines per field.
900 	 */
901 	if (interlaced)
902 		vdisplay_rnd = vdisplay / 2;
903 	else
904 		vdisplay_rnd = vdisplay;
905 
906 	/* 3. Find the frame rate required: */
907 	if (interlaced)
908 		vfieldrate_rqd = vrefresh * 2;
909 	else
910 		vfieldrate_rqd = vrefresh;
911 
912 	/* 4. Find number of lines in Top margin: */
913 	top_margin = 0;
914 	if (margins)
915 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
916 				1000;
917 	/* 5. Find number of lines in bottom margin: */
918 	bottom_margin = top_margin;
919 
920 	/* 6. If interlace is required, then set variable interlace: */
921 	if (interlaced)
922 		interlace = 1;
923 	else
924 		interlace = 0;
925 
926 	/* 7. Estimate the Horizontal frequency */
927 	{
928 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
929 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
930 				2 + interlace;
931 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
932 	}
933 
934 	/* 8. Find the number of lines in V sync + back porch */
935 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
936 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
937 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
938 	/*  9. Find the number of lines in V back porch alone: */
939 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
940 	/*  10. Find the total number of lines in Vertical field period: */
941 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
942 			vsync_plus_bp + GTF_MIN_V_PORCH;
943 	/*  11. Estimate the Vertical field frequency: */
944 	vfieldrate_est = hfreq_est / vtotal_lines;
945 	/*  12. Find the actual horizontal period: */
946 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
947 
948 	/*  13. Find the actual Vertical field frequency: */
949 	vfield_rate = hfreq_est / vtotal_lines;
950 	/*  14. Find the Vertical frame frequency: */
951 	if (interlaced)
952 		vframe_rate = vfield_rate / 2;
953 	else
954 		vframe_rate = vfield_rate;
955 	/*  15. Find number of pixels in left margin: */
956 	if (margins)
957 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
958 				1000;
959 	else
960 		left_margin = 0;
961 
962 	/* 16.Find number of pixels in right margin: */
963 	right_margin = left_margin;
964 	/* 17.Find total number of active pixels in image and left and right */
965 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
966 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
967 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
968 				(GTF_M_PRIME * 1000000 / hfreq_est);
969 	/* 19.Find the number of pixels in the blanking time to the nearest
970 	 * double character cell: */
971 	hblank = total_active_pixels * ideal_duty_cycle /
972 			(100000 - ideal_duty_cycle);
973 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
974 	hblank = hblank * 2 * GTF_CELL_GRAN;
975 	/* 20.Find total number of pixels: */
976 	total_pixels = total_active_pixels + hblank;
977 	/* 21.Find pixel clock frequency: */
978 	pixel_freq = total_pixels * hfreq_est / 1000;
979 	/* Stage 1 computations are now complete; I should really pass
980 	 * the results to another function and do the Stage 2 computations,
981 	 * but I only need a few more values so I'll just append the
982 	 * computations here for now */
983 	/* 17. Find the number of pixels in the horizontal sync period: */
984 	hsync = H_SYNC_PERCENT * total_pixels / 100;
985 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
986 	hsync = hsync * GTF_CELL_GRAN;
987 	/* 18. Find the number of pixels in horizontal front porch period */
988 	hfront_porch = hblank / 2 - hsync;
989 	/*  36. Find the number of lines in the odd front porch period: */
990 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
991 
992 	/* finally, pack the results in the mode struct */
993 	drm_mode->hdisplay = hdisplay_rnd;
994 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
995 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
996 	drm_mode->htotal = total_pixels;
997 	drm_mode->vdisplay = vdisplay_rnd;
998 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
999 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
1000 	drm_mode->vtotal = vtotal_lines;
1001 
1002 	drm_mode->clock = pixel_freq;
1003 
1004 	if (interlaced) {
1005 		drm_mode->vtotal *= 2;
1006 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1007 	}
1008 
1009 	drm_mode_set_name(drm_mode);
1010 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1011 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1012 	else
1013 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1014 
1015 	return drm_mode;
1016 }
1017 EXPORT_SYMBOL(drm_gtf_mode_complex);
1018 
1019 /**
1020  * drm_gtf_mode - create the modeline based on the GTF algorithm
1021  * @dev: drm device
1022  * @hdisplay: hdisplay size
1023  * @vdisplay: vdisplay size
1024  * @vrefresh: vrefresh rate.
1025  * @interlaced: whether to compute an interlaced mode
1026  * @margins: desired margin (borders) size
1027  *
1028  * return the modeline based on GTF algorithm
1029  *
1030  * This function is to create the modeline based on the GTF algorithm.
1031  * Generalized Timing Formula is derived from:
1032  *
1033  *	GTF Spreadsheet by Andy Morrish (1/5/97)
1034  *	available at https://www.vesa.org
1035  *
1036  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1037  * What I have done is to translate it by using integer calculation.
1038  * I also refer to the function of fb_get_mode in the file of
1039  * drivers/video/fbmon.c
1040  *
1041  * Standard GTF parameters::
1042  *
1043  *     M = 600
1044  *     C = 40
1045  *     K = 128
1046  *     J = 20
1047  *
1048  * Returns:
1049  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
1050  * The display mode object is allocated with drm_mode_create(). Returns NULL
1051  * when no mode could be allocated.
1052  */
1053 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)1054 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1055 	     bool interlaced, int margins)
1056 {
1057 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1058 				    interlaced, margins,
1059 				    600, 40 * 2, 128, 20 * 2);
1060 }
1061 EXPORT_SYMBOL(drm_gtf_mode);
1062 
1063 #ifdef CONFIG_VIDEOMODE_HELPERS
1064 /**
1065  * drm_display_mode_from_videomode - fill in @dmode using @vm,
1066  * @vm: videomode structure to use as source
1067  * @dmode: drm_display_mode structure to use as destination
1068  *
1069  * Fills out @dmode using the display mode specified in @vm.
1070  */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)1071 void drm_display_mode_from_videomode(const struct videomode *vm,
1072 				     struct drm_display_mode *dmode)
1073 {
1074 	dmode->hdisplay = vm->hactive;
1075 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1076 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1077 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
1078 
1079 	dmode->vdisplay = vm->vactive;
1080 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1081 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1082 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1083 
1084 	dmode->clock = vm->pixelclock / 1000;
1085 
1086 	dmode->flags = 0;
1087 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1088 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1089 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1090 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1091 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1092 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1093 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1094 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1095 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1096 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1097 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1098 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1099 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1100 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1101 	drm_mode_set_name(dmode);
1102 }
1103 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1104 
1105 /**
1106  * drm_display_mode_to_videomode - fill in @vm using @dmode,
1107  * @dmode: drm_display_mode structure to use as source
1108  * @vm: videomode structure to use as destination
1109  *
1110  * Fills out @vm using the display mode specified in @dmode.
1111  */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)1112 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1113 				   struct videomode *vm)
1114 {
1115 	vm->hactive = dmode->hdisplay;
1116 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1117 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1118 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
1119 
1120 	vm->vactive = dmode->vdisplay;
1121 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1122 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1123 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1124 
1125 	vm->pixelclock = dmode->clock * 1000;
1126 
1127 	vm->flags = 0;
1128 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1129 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1130 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1131 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1132 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1133 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1134 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1135 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1136 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1137 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
1138 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1139 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1140 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1141 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1142 }
1143 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1144 
1145 /**
1146  * drm_bus_flags_from_videomode - extract information about pixelclk and
1147  * DE polarity from videomode and store it in a separate variable
1148  * @vm: videomode structure to use
1149  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
1150  * here
1151  *
1152  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1153  * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1154  * found in @vm
1155  */
drm_bus_flags_from_videomode(const struct videomode * vm,u32 * bus_flags)1156 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1157 {
1158 	*bus_flags = 0;
1159 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1160 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1161 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1162 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1163 
1164 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1165 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1166 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1167 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1168 
1169 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1170 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
1171 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1172 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1173 }
1174 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1175 
1176 #ifdef CONFIG_OF
1177 /**
1178  * of_get_drm_display_mode - get a drm_display_mode from devicetree
1179  * @np: device_node with the timing specification
1180  * @dmode: will be set to the return value
1181  * @bus_flags: information about pixelclk, sync and DE polarity
1182  * @index: index into the list of display timings in devicetree
1183  *
1184  * This function is expensive and should only be used, if only one mode is to be
1185  * read from DT. To get multiple modes start with of_get_display_timings and
1186  * work with that instead.
1187  *
1188  * Returns:
1189  * 0 on success, a negative errno code when no of videomode node was found.
1190  */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags,int index)1191 int of_get_drm_display_mode(struct device_node *np,
1192 			    struct drm_display_mode *dmode, u32 *bus_flags,
1193 			    int index)
1194 {
1195 	struct videomode vm;
1196 	int ret;
1197 
1198 	ret = of_get_videomode(np, &vm, index);
1199 	if (ret)
1200 		return ret;
1201 
1202 	drm_display_mode_from_videomode(&vm, dmode);
1203 	if (bus_flags)
1204 		drm_bus_flags_from_videomode(&vm, bus_flags);
1205 
1206 	pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n",
1207 		 np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode));
1208 
1209 	return 0;
1210 }
1211 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1212 
1213 /**
1214  * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1215  * @np: device_node with the panel-timing specification
1216  * @dmode: will be set to the return value
1217  * @bus_flags: information about pixelclk, sync and DE polarity
1218  *
1219  * The mandatory Device Tree properties width-mm and height-mm
1220  * are read and set on the display mode.
1221  *
1222  * Returns:
1223  * Zero on success, negative error code on failure.
1224  */
of_get_drm_panel_display_mode(struct device_node * np,struct drm_display_mode * dmode,u32 * bus_flags)1225 int of_get_drm_panel_display_mode(struct device_node *np,
1226 				  struct drm_display_mode *dmode, u32 *bus_flags)
1227 {
1228 	u32 width_mm = 0, height_mm = 0;
1229 	struct display_timing timing;
1230 	struct videomode vm;
1231 	int ret;
1232 
1233 	ret = of_get_display_timing(np, "panel-timing", &timing);
1234 	if (ret)
1235 		return ret;
1236 
1237 	videomode_from_timing(&timing, &vm);
1238 
1239 	memset(dmode, 0, sizeof(*dmode));
1240 	drm_display_mode_from_videomode(&vm, dmode);
1241 	if (bus_flags)
1242 		drm_bus_flags_from_videomode(&vm, bus_flags);
1243 
1244 	ret = of_property_read_u32(np, "width-mm", &width_mm);
1245 	if (ret)
1246 		return ret;
1247 
1248 	ret = of_property_read_u32(np, "height-mm", &height_mm);
1249 	if (ret)
1250 		return ret;
1251 
1252 	dmode->width_mm = width_mm;
1253 	dmode->height_mm = height_mm;
1254 
1255 	pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode));
1256 
1257 	return 0;
1258 }
1259 EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1260 #endif /* CONFIG_OF */
1261 #endif /* CONFIG_VIDEOMODE_HELPERS */
1262 
1263 /**
1264  * drm_mode_set_name - set the name on a mode
1265  * @mode: name will be set in this mode
1266  *
1267  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1268  * with an optional 'i' suffix for interlaced modes.
1269  */
drm_mode_set_name(struct drm_display_mode * mode)1270 void drm_mode_set_name(struct drm_display_mode *mode)
1271 {
1272 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1273 
1274 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
1275 		 mode->hdisplay, mode->vdisplay,
1276 		 interlaced ? "i" : "");
1277 }
1278 EXPORT_SYMBOL(drm_mode_set_name);
1279 
1280 /**
1281  * drm_mode_vrefresh - get the vrefresh of a mode
1282  * @mode: mode
1283  *
1284  * Returns:
1285  * @modes's vrefresh rate in Hz, rounded to the nearest integer.
1286  */
drm_mode_vrefresh(const struct drm_display_mode * mode)1287 int drm_mode_vrefresh(const struct drm_display_mode *mode)
1288 {
1289 	unsigned int num = 1, den = 1;
1290 
1291 	if (mode->htotal == 0 || mode->vtotal == 0)
1292 		return 0;
1293 
1294 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1295 		num *= 2;
1296 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1297 		den *= 2;
1298 	if (mode->vscan > 1)
1299 		den *= mode->vscan;
1300 
1301 	if (check_mul_overflow(mode->clock, num, &num))
1302 		return 0;
1303 
1304 	if (check_mul_overflow(mode->htotal * mode->vtotal, den, &den))
1305 		return 0;
1306 
1307 	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1308 }
1309 EXPORT_SYMBOL(drm_mode_vrefresh);
1310 
1311 /**
1312  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1313  * @mode: mode to query
1314  * @hdisplay: hdisplay value to fill in
1315  * @vdisplay: vdisplay value to fill in
1316  *
1317  * The vdisplay value will be doubled if the specified mode is a stereo mode of
1318  * the appropriate layout.
1319  */
drm_mode_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)1320 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1321 			    int *hdisplay, int *vdisplay)
1322 {
1323 	struct drm_display_mode adjusted;
1324 
1325 	drm_mode_init(&adjusted, mode);
1326 
1327 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
1328 	*hdisplay = adjusted.crtc_hdisplay;
1329 	*vdisplay = adjusted.crtc_vdisplay;
1330 }
1331 EXPORT_SYMBOL(drm_mode_get_hv_timing);
1332 
1333 /**
1334  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1335  * @p: mode
1336  * @adjust_flags: a combination of adjustment flags
1337  *
1338  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1339  *
1340  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1341  *   interlaced modes.
1342  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1343  *   buffers containing two eyes (only adjust the timings when needed, eg. for
1344  *   "frame packing" or "side by side full").
1345  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1346  *   be performed for doublescan and vscan > 1 modes respectively.
1347  */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)1348 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1349 {
1350 	if (!p)
1351 		return;
1352 
1353 	p->crtc_clock = p->clock;
1354 	p->crtc_hdisplay = p->hdisplay;
1355 	p->crtc_hsync_start = p->hsync_start;
1356 	p->crtc_hsync_end = p->hsync_end;
1357 	p->crtc_htotal = p->htotal;
1358 	p->crtc_hskew = p->hskew;
1359 	p->crtc_vdisplay = p->vdisplay;
1360 	p->crtc_vsync_start = p->vsync_start;
1361 	p->crtc_vsync_end = p->vsync_end;
1362 	p->crtc_vtotal = p->vtotal;
1363 
1364 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1365 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1366 			p->crtc_vdisplay /= 2;
1367 			p->crtc_vsync_start /= 2;
1368 			p->crtc_vsync_end /= 2;
1369 			p->crtc_vtotal /= 2;
1370 		}
1371 	}
1372 
1373 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1374 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1375 			p->crtc_vdisplay *= 2;
1376 			p->crtc_vsync_start *= 2;
1377 			p->crtc_vsync_end *= 2;
1378 			p->crtc_vtotal *= 2;
1379 		}
1380 	}
1381 
1382 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
1383 		if (p->vscan > 1) {
1384 			p->crtc_vdisplay *= p->vscan;
1385 			p->crtc_vsync_start *= p->vscan;
1386 			p->crtc_vsync_end *= p->vscan;
1387 			p->crtc_vtotal *= p->vscan;
1388 		}
1389 	}
1390 
1391 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
1392 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1393 
1394 		switch (layout) {
1395 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
1396 			p->crtc_clock *= 2;
1397 			p->crtc_vdisplay += p->crtc_vtotal;
1398 			p->crtc_vsync_start += p->crtc_vtotal;
1399 			p->crtc_vsync_end += p->crtc_vtotal;
1400 			p->crtc_vtotal += p->crtc_vtotal;
1401 			break;
1402 		}
1403 	}
1404 
1405 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1406 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1407 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1408 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1409 }
1410 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1411 
1412 /**
1413  * drm_mode_copy - copy the mode
1414  * @dst: mode to overwrite
1415  * @src: mode to copy
1416  *
1417  * Copy an existing mode into another mode, preserving the
1418  * list head of the destination mode.
1419  */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)1420 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1421 {
1422 	struct list_head head = dst->head;
1423 
1424 	*dst = *src;
1425 	dst->head = head;
1426 }
1427 EXPORT_SYMBOL(drm_mode_copy);
1428 
1429 /**
1430  * drm_mode_init - initialize the mode from another mode
1431  * @dst: mode to overwrite
1432  * @src: mode to copy
1433  *
1434  * Copy an existing mode into another mode, zeroing the
1435  * list head of the destination mode. Typically used
1436  * to guarantee the list head is not left with stack
1437  * garbage in on-stack modes.
1438  */
drm_mode_init(struct drm_display_mode * dst,const struct drm_display_mode * src)1439 void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1440 {
1441 	memset(dst, 0, sizeof(*dst));
1442 	drm_mode_copy(dst, src);
1443 }
1444 EXPORT_SYMBOL(drm_mode_init);
1445 
1446 /**
1447  * drm_mode_duplicate - allocate and duplicate an existing mode
1448  * @dev: drm_device to allocate the duplicated mode for
1449  * @mode: mode to duplicate
1450  *
1451  * Just allocate a new mode, copy the existing mode into it, and return
1452  * a pointer to it.  Used to create new instances of established modes.
1453  *
1454  * Returns:
1455  * Pointer to duplicated mode on success, NULL on error.
1456  */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)1457 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1458 					    const struct drm_display_mode *mode)
1459 {
1460 	struct drm_display_mode *nmode;
1461 
1462 	nmode = drm_mode_create(dev);
1463 	if (!nmode)
1464 		return NULL;
1465 
1466 	drm_mode_copy(nmode, mode);
1467 
1468 	return nmode;
1469 }
1470 EXPORT_SYMBOL(drm_mode_duplicate);
1471 
drm_mode_match_timings(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1472 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1473 				   const struct drm_display_mode *mode2)
1474 {
1475 	return mode1->hdisplay == mode2->hdisplay &&
1476 		mode1->hsync_start == mode2->hsync_start &&
1477 		mode1->hsync_end == mode2->hsync_end &&
1478 		mode1->htotal == mode2->htotal &&
1479 		mode1->hskew == mode2->hskew &&
1480 		mode1->vdisplay == mode2->vdisplay &&
1481 		mode1->vsync_start == mode2->vsync_start &&
1482 		mode1->vsync_end == mode2->vsync_end &&
1483 		mode1->vtotal == mode2->vtotal &&
1484 		mode1->vscan == mode2->vscan;
1485 }
1486 
drm_mode_match_clock(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1487 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1488 				  const struct drm_display_mode *mode2)
1489 {
1490 	/*
1491 	 * do clock check convert to PICOS
1492 	 * so fb modes get matched the same
1493 	 */
1494 	if (mode1->clock && mode2->clock)
1495 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1496 	else
1497 		return mode1->clock == mode2->clock;
1498 }
1499 
drm_mode_match_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1500 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1501 				 const struct drm_display_mode *mode2)
1502 {
1503 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1504 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1505 }
1506 
drm_mode_match_3d_flags(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1507 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1508 				    const struct drm_display_mode *mode2)
1509 {
1510 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1511 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
1512 }
1513 
drm_mode_match_aspect_ratio(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1514 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1515 					const struct drm_display_mode *mode2)
1516 {
1517 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1518 }
1519 
1520 /**
1521  * drm_mode_match - test modes for (partial) equality
1522  * @mode1: first mode
1523  * @mode2: second mode
1524  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1525  *
1526  * Check to see if @mode1 and @mode2 are equivalent.
1527  *
1528  * Returns:
1529  * True if the modes are (partially) equal, false otherwise.
1530  */
drm_mode_match(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2,unsigned int match_flags)1531 bool drm_mode_match(const struct drm_display_mode *mode1,
1532 		    const struct drm_display_mode *mode2,
1533 		    unsigned int match_flags)
1534 {
1535 	if (!mode1 && !mode2)
1536 		return true;
1537 
1538 	if (!mode1 || !mode2)
1539 		return false;
1540 
1541 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1542 	    !drm_mode_match_timings(mode1, mode2))
1543 		return false;
1544 
1545 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1546 	    !drm_mode_match_clock(mode1, mode2))
1547 		return false;
1548 
1549 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1550 	    !drm_mode_match_flags(mode1, mode2))
1551 		return false;
1552 
1553 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1554 	    !drm_mode_match_3d_flags(mode1, mode2))
1555 		return false;
1556 
1557 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1558 	    !drm_mode_match_aspect_ratio(mode1, mode2))
1559 		return false;
1560 
1561 	return true;
1562 }
1563 EXPORT_SYMBOL(drm_mode_match);
1564 
1565 /**
1566  * drm_mode_equal - test modes for equality
1567  * @mode1: first mode
1568  * @mode2: second mode
1569  *
1570  * Check to see if @mode1 and @mode2 are equivalent.
1571  *
1572  * Returns:
1573  * True if the modes are equal, false otherwise.
1574  */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1575 bool drm_mode_equal(const struct drm_display_mode *mode1,
1576 		    const struct drm_display_mode *mode2)
1577 {
1578 	return drm_mode_match(mode1, mode2,
1579 			      DRM_MODE_MATCH_TIMINGS |
1580 			      DRM_MODE_MATCH_CLOCK |
1581 			      DRM_MODE_MATCH_FLAGS |
1582 			      DRM_MODE_MATCH_3D_FLAGS|
1583 			      DRM_MODE_MATCH_ASPECT_RATIO);
1584 }
1585 EXPORT_SYMBOL(drm_mode_equal);
1586 
1587 /**
1588  * drm_mode_equal_no_clocks - test modes for equality
1589  * @mode1: first mode
1590  * @mode2: second mode
1591  *
1592  * Check to see if @mode1 and @mode2 are equivalent, but
1593  * don't check the pixel clocks.
1594  *
1595  * Returns:
1596  * True if the modes are equal, false otherwise.
1597  */
drm_mode_equal_no_clocks(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1598 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1599 			      const struct drm_display_mode *mode2)
1600 {
1601 	return drm_mode_match(mode1, mode2,
1602 			      DRM_MODE_MATCH_TIMINGS |
1603 			      DRM_MODE_MATCH_FLAGS |
1604 			      DRM_MODE_MATCH_3D_FLAGS);
1605 }
1606 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1607 
1608 /**
1609  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1610  * @mode1: first mode
1611  * @mode2: second mode
1612  *
1613  * Check to see if @mode1 and @mode2 are equivalent, but
1614  * don't check the pixel clocks nor the stereo layout.
1615  *
1616  * Returns:
1617  * True if the modes are equal, false otherwise.
1618  */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)1619 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1620 					const struct drm_display_mode *mode2)
1621 {
1622 	return drm_mode_match(mode1, mode2,
1623 			      DRM_MODE_MATCH_TIMINGS |
1624 			      DRM_MODE_MATCH_FLAGS);
1625 }
1626 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1627 
1628 static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)1629 drm_mode_validate_basic(const struct drm_display_mode *mode)
1630 {
1631 	if (mode->type & ~DRM_MODE_TYPE_ALL)
1632 		return MODE_BAD;
1633 
1634 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1635 		return MODE_BAD;
1636 
1637 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1638 		return MODE_BAD;
1639 
1640 	if (mode->clock == 0)
1641 		return MODE_CLOCK_LOW;
1642 
1643 	if (mode->hdisplay == 0 ||
1644 	    mode->hsync_start < mode->hdisplay ||
1645 	    mode->hsync_end < mode->hsync_start ||
1646 	    mode->htotal < mode->hsync_end)
1647 		return MODE_H_ILLEGAL;
1648 
1649 	if (mode->vdisplay == 0 ||
1650 	    mode->vsync_start < mode->vdisplay ||
1651 	    mode->vsync_end < mode->vsync_start ||
1652 	    mode->vtotal < mode->vsync_end)
1653 		return MODE_V_ILLEGAL;
1654 
1655 	return MODE_OK;
1656 }
1657 
1658 /**
1659  * drm_mode_validate_driver - make sure the mode is somewhat sane
1660  * @dev: drm device
1661  * @mode: mode to check
1662  *
1663  * First do basic validation on the mode, and then allow the driver
1664  * to check for device/driver specific limitations via the optional
1665  * &drm_mode_config_helper_funcs.mode_valid hook.
1666  *
1667  * Returns:
1668  * The mode status
1669  */
1670 enum drm_mode_status
drm_mode_validate_driver(struct drm_device * dev,const struct drm_display_mode * mode)1671 drm_mode_validate_driver(struct drm_device *dev,
1672 			const struct drm_display_mode *mode)
1673 {
1674 	enum drm_mode_status status;
1675 
1676 	status = drm_mode_validate_basic(mode);
1677 	if (status != MODE_OK)
1678 		return status;
1679 
1680 	if (dev->mode_config.funcs->mode_valid)
1681 		return dev->mode_config.funcs->mode_valid(dev, mode);
1682 	else
1683 		return MODE_OK;
1684 }
1685 EXPORT_SYMBOL(drm_mode_validate_driver);
1686 
1687 /**
1688  * drm_mode_validate_size - make sure modes adhere to size constraints
1689  * @mode: mode to check
1690  * @maxX: maximum width
1691  * @maxY: maximum height
1692  *
1693  * This function is a helper which can be used to validate modes against size
1694  * limitations of the DRM device/connector. If a mode is too big its status
1695  * member is updated with the appropriate validation failure code. The list
1696  * itself is not changed.
1697  *
1698  * Returns:
1699  * The mode status
1700  */
1701 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1702 drm_mode_validate_size(const struct drm_display_mode *mode,
1703 		       int maxX, int maxY)
1704 {
1705 	if (maxX > 0 && mode->hdisplay > maxX)
1706 		return MODE_VIRTUAL_X;
1707 
1708 	if (maxY > 0 && mode->vdisplay > maxY)
1709 		return MODE_VIRTUAL_Y;
1710 
1711 	return MODE_OK;
1712 }
1713 EXPORT_SYMBOL(drm_mode_validate_size);
1714 
1715 /**
1716  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1717  * @mode: mode to check
1718  * @connector: drm connector under action
1719  *
1720  * This function is a helper which can be used to filter out any YCBCR420
1721  * only mode, when the source doesn't support it.
1722  *
1723  * Returns:
1724  * The mode status
1725  */
1726 enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode * mode,struct drm_connector * connector)1727 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1728 			   struct drm_connector *connector)
1729 {
1730 	if (!connector->ycbcr_420_allowed &&
1731 	    drm_mode_is_420_only(&connector->display_info, mode))
1732 		return MODE_NO_420;
1733 
1734 	return MODE_OK;
1735 }
1736 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1737 
1738 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1739 
1740 static const char * const drm_mode_status_names[] = {
1741 	MODE_STATUS(OK),
1742 	MODE_STATUS(HSYNC),
1743 	MODE_STATUS(VSYNC),
1744 	MODE_STATUS(H_ILLEGAL),
1745 	MODE_STATUS(V_ILLEGAL),
1746 	MODE_STATUS(BAD_WIDTH),
1747 	MODE_STATUS(NOMODE),
1748 	MODE_STATUS(NO_INTERLACE),
1749 	MODE_STATUS(NO_DBLESCAN),
1750 	MODE_STATUS(NO_VSCAN),
1751 	MODE_STATUS(MEM),
1752 	MODE_STATUS(VIRTUAL_X),
1753 	MODE_STATUS(VIRTUAL_Y),
1754 	MODE_STATUS(MEM_VIRT),
1755 	MODE_STATUS(NOCLOCK),
1756 	MODE_STATUS(CLOCK_HIGH),
1757 	MODE_STATUS(CLOCK_LOW),
1758 	MODE_STATUS(CLOCK_RANGE),
1759 	MODE_STATUS(BAD_HVALUE),
1760 	MODE_STATUS(BAD_VVALUE),
1761 	MODE_STATUS(BAD_VSCAN),
1762 	MODE_STATUS(HSYNC_NARROW),
1763 	MODE_STATUS(HSYNC_WIDE),
1764 	MODE_STATUS(HBLANK_NARROW),
1765 	MODE_STATUS(HBLANK_WIDE),
1766 	MODE_STATUS(VSYNC_NARROW),
1767 	MODE_STATUS(VSYNC_WIDE),
1768 	MODE_STATUS(VBLANK_NARROW),
1769 	MODE_STATUS(VBLANK_WIDE),
1770 	MODE_STATUS(PANEL),
1771 	MODE_STATUS(INTERLACE_WIDTH),
1772 	MODE_STATUS(ONE_WIDTH),
1773 	MODE_STATUS(ONE_HEIGHT),
1774 	MODE_STATUS(ONE_SIZE),
1775 	MODE_STATUS(NO_REDUCED),
1776 	MODE_STATUS(NO_STEREO),
1777 	MODE_STATUS(NO_420),
1778 	MODE_STATUS(STALE),
1779 	MODE_STATUS(BAD),
1780 	MODE_STATUS(ERROR),
1781 };
1782 
1783 #undef MODE_STATUS
1784 
drm_get_mode_status_name(enum drm_mode_status status)1785 const char *drm_get_mode_status_name(enum drm_mode_status status)
1786 {
1787 	int index = status + 3;
1788 
1789 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1790 		return "";
1791 
1792 	return drm_mode_status_names[index];
1793 }
1794 
1795 /**
1796  * drm_mode_prune_invalid - remove invalid modes from mode list
1797  * @dev: DRM device
1798  * @mode_list: list of modes to check
1799  * @verbose: be verbose about it
1800  *
1801  * This helper function can be used to prune a display mode list after
1802  * validation has been completed. All modes whose status is not MODE_OK will be
1803  * removed from the list, and if @verbose the status code and mode name is also
1804  * printed to dmesg.
1805  */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1806 void drm_mode_prune_invalid(struct drm_device *dev,
1807 			    struct list_head *mode_list, bool verbose)
1808 {
1809 	struct drm_display_mode *mode, *t;
1810 
1811 	list_for_each_entry_safe(mode, t, mode_list, head) {
1812 		if (mode->status != MODE_OK) {
1813 			list_del(&mode->head);
1814 			if (mode->type & DRM_MODE_TYPE_USERDEF) {
1815 				drm_warn(dev, "User-defined mode not supported: "
1816 					 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1817 			}
1818 			if (verbose) {
1819 				drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n",
1820 					    DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status));
1821 			}
1822 			drm_mode_destroy(dev, mode);
1823 		}
1824 	}
1825 }
1826 EXPORT_SYMBOL(drm_mode_prune_invalid);
1827 
1828 /**
1829  * drm_mode_compare - compare modes for favorability
1830  * @priv: unused
1831  * @lh_a: list_head for first mode
1832  * @lh_b: list_head for second mode
1833  *
1834  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1835  * which is better.
1836  *
1837  * Returns:
1838  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1839  * positive if @lh_b is better than @lh_a.
1840  */
drm_mode_compare(void * priv,const struct list_head * lh_a,const struct list_head * lh_b)1841 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1842 			    const struct list_head *lh_b)
1843 {
1844 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1845 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1846 	int diff;
1847 
1848 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1849 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1850 	if (diff)
1851 		return diff;
1852 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1853 	if (diff)
1854 		return diff;
1855 
1856 	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1857 	if (diff)
1858 		return diff;
1859 
1860 	diff = b->clock - a->clock;
1861 	return diff;
1862 }
1863 
1864 /**
1865  * drm_mode_sort - sort mode list
1866  * @mode_list: list of drm_display_mode structures to sort
1867  *
1868  * Sort @mode_list by favorability, moving good modes to the head of the list.
1869  */
drm_mode_sort(struct list_head * mode_list)1870 void drm_mode_sort(struct list_head *mode_list)
1871 {
1872 	list_sort(NULL, mode_list, drm_mode_compare);
1873 }
1874 EXPORT_SYMBOL(drm_mode_sort);
1875 
1876 /**
1877  * drm_connector_list_update - update the mode list for the connector
1878  * @connector: the connector to update
1879  *
1880  * This moves the modes from the @connector probed_modes list
1881  * to the actual mode list. It compares the probed mode against the current
1882  * list and only adds different/new modes.
1883  *
1884  * This is just a helper functions doesn't validate any modes itself and also
1885  * doesn't prune any invalid modes. Callers need to do that themselves.
1886  */
drm_connector_list_update(struct drm_connector * connector)1887 void drm_connector_list_update(struct drm_connector *connector)
1888 {
1889 	struct drm_display_mode *pmode, *pt;
1890 
1891 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1892 
1893 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1894 		struct drm_display_mode *mode;
1895 		bool found_it = false;
1896 
1897 		/* go through current modes checking for the new probed mode */
1898 		list_for_each_entry(mode, &connector->modes, head) {
1899 			if (!drm_mode_equal(pmode, mode))
1900 				continue;
1901 
1902 			found_it = true;
1903 
1904 			/*
1905 			 * If the old matching mode is stale (ie. left over
1906 			 * from a previous probe) just replace it outright.
1907 			 * Otherwise just merge the type bits between all
1908 			 * equal probed modes.
1909 			 *
1910 			 * If two probed modes are considered equal, pick the
1911 			 * actual timings from the one that's marked as
1912 			 * preferred (in case the match isn't 100%). If
1913 			 * multiple or zero preferred modes are present, favor
1914 			 * the mode added to the probed_modes list first.
1915 			 */
1916 			if (mode->status == MODE_STALE) {
1917 				drm_mode_copy(mode, pmode);
1918 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1919 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1920 				pmode->type |= mode->type;
1921 				drm_mode_copy(mode, pmode);
1922 			} else {
1923 				mode->type |= pmode->type;
1924 			}
1925 
1926 			list_del(&pmode->head);
1927 			drm_mode_destroy(connector->dev, pmode);
1928 			break;
1929 		}
1930 
1931 		if (!found_it) {
1932 			list_move_tail(&pmode->head, &connector->modes);
1933 		}
1934 	}
1935 }
1936 EXPORT_SYMBOL(drm_connector_list_update);
1937 
drm_mode_parse_cmdline_bpp(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1938 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1939 				      struct drm_cmdline_mode *mode)
1940 {
1941 	unsigned int bpp;
1942 
1943 	if (str[0] != '-')
1944 		return -EINVAL;
1945 
1946 	str++;
1947 	bpp = simple_strtol(str, end_ptr, 10);
1948 	if (*end_ptr == str)
1949 		return -EINVAL;
1950 
1951 	mode->bpp = bpp;
1952 	mode->bpp_specified = true;
1953 
1954 	return 0;
1955 }
1956 
drm_mode_parse_cmdline_refresh(const char * str,char ** end_ptr,struct drm_cmdline_mode * mode)1957 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1958 					  struct drm_cmdline_mode *mode)
1959 {
1960 	unsigned int refresh;
1961 
1962 	if (str[0] != '@')
1963 		return -EINVAL;
1964 
1965 	str++;
1966 	refresh = simple_strtol(str, end_ptr, 10);
1967 	if (*end_ptr == str)
1968 		return -EINVAL;
1969 
1970 	mode->refresh = refresh;
1971 	mode->refresh_specified = true;
1972 
1973 	return 0;
1974 }
1975 
drm_mode_parse_cmdline_extra(const char * str,int length,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)1976 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1977 					bool freestanding,
1978 					const struct drm_connector *connector,
1979 					struct drm_cmdline_mode *mode)
1980 {
1981 	int i;
1982 
1983 	for (i = 0; i < length; i++) {
1984 		switch (str[i]) {
1985 		case 'i':
1986 			if (freestanding)
1987 				return -EINVAL;
1988 
1989 			mode->interlace = true;
1990 			break;
1991 		case 'm':
1992 			if (freestanding)
1993 				return -EINVAL;
1994 
1995 			mode->margins = true;
1996 			break;
1997 		case 'D':
1998 			if (mode->force != DRM_FORCE_UNSPECIFIED)
1999 				return -EINVAL;
2000 
2001 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2002 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2003 				mode->force = DRM_FORCE_ON;
2004 			else
2005 				mode->force = DRM_FORCE_ON_DIGITAL;
2006 			break;
2007 		case 'd':
2008 			if (mode->force != DRM_FORCE_UNSPECIFIED)
2009 				return -EINVAL;
2010 
2011 			mode->force = DRM_FORCE_OFF;
2012 			break;
2013 		case 'e':
2014 			if (mode->force != DRM_FORCE_UNSPECIFIED)
2015 				return -EINVAL;
2016 
2017 			mode->force = DRM_FORCE_ON;
2018 			break;
2019 		default:
2020 			return -EINVAL;
2021 		}
2022 	}
2023 
2024 	return 0;
2025 }
2026 
drm_mode_parse_cmdline_res_mode(const char * str,unsigned int length,bool extras,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2027 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2028 					   bool extras,
2029 					   const struct drm_connector *connector,
2030 					   struct drm_cmdline_mode *mode)
2031 {
2032 	const char *str_start = str;
2033 	bool rb = false, cvt = false;
2034 	int xres = 0, yres = 0;
2035 	int remaining, i;
2036 	char *end_ptr;
2037 
2038 	xres = simple_strtol(str, &end_ptr, 10);
2039 	if (end_ptr == str)
2040 		return -EINVAL;
2041 
2042 	if (end_ptr[0] != 'x')
2043 		return -EINVAL;
2044 	end_ptr++;
2045 
2046 	str = end_ptr;
2047 	yres = simple_strtol(str, &end_ptr, 10);
2048 	if (end_ptr == str)
2049 		return -EINVAL;
2050 
2051 	remaining = length - (end_ptr - str_start);
2052 	if (remaining < 0)
2053 		return -EINVAL;
2054 
2055 	for (i = 0; i < remaining; i++) {
2056 		switch (end_ptr[i]) {
2057 		case 'M':
2058 			cvt = true;
2059 			break;
2060 		case 'R':
2061 			rb = true;
2062 			break;
2063 		default:
2064 			/*
2065 			 * Try to pass that to our extras parsing
2066 			 * function to handle the case where the
2067 			 * extras are directly after the resolution
2068 			 */
2069 			if (extras) {
2070 				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
2071 								       1,
2072 								       false,
2073 								       connector,
2074 								       mode);
2075 				if (ret)
2076 					return ret;
2077 			} else {
2078 				return -EINVAL;
2079 			}
2080 		}
2081 	}
2082 
2083 	mode->xres = xres;
2084 	mode->yres = yres;
2085 	mode->cvt = cvt;
2086 	mode->rb = rb;
2087 
2088 	return 0;
2089 }
2090 
drm_mode_parse_cmdline_int(const char * delim,unsigned int * int_ret)2091 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2092 {
2093 	const char *value;
2094 	char *endp;
2095 
2096 	/*
2097 	 * delim must point to the '=', otherwise it is a syntax error and
2098 	 * if delim points to the terminating zero, then delim + 1 will point
2099 	 * past the end of the string.
2100 	 */
2101 	if (*delim != '=')
2102 		return -EINVAL;
2103 
2104 	value = delim + 1;
2105 	*int_ret = simple_strtol(value, &endp, 10);
2106 
2107 	/* Make sure we have parsed something */
2108 	if (endp == value)
2109 		return -EINVAL;
2110 
2111 	return 0;
2112 }
2113 
drm_mode_parse_panel_orientation(const char * delim,struct drm_cmdline_mode * mode)2114 static int drm_mode_parse_panel_orientation(const char *delim,
2115 					    struct drm_cmdline_mode *mode)
2116 {
2117 	const char *value;
2118 
2119 	if (*delim != '=')
2120 		return -EINVAL;
2121 
2122 	value = delim + 1;
2123 	delim = strchr(value, ',');
2124 	if (!delim)
2125 		delim = value + strlen(value);
2126 
2127 	if (!strncmp(value, "normal", delim - value))
2128 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2129 	else if (!strncmp(value, "upside_down", delim - value))
2130 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2131 	else if (!strncmp(value, "left_side_up", delim - value))
2132 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2133 	else if (!strncmp(value, "right_side_up", delim - value))
2134 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2135 	else
2136 		return -EINVAL;
2137 
2138 	return 0;
2139 }
2140 
drm_mode_parse_tv_mode(const char * delim,struct drm_cmdline_mode * mode)2141 static int drm_mode_parse_tv_mode(const char *delim,
2142 				  struct drm_cmdline_mode *mode)
2143 {
2144 	const char *value;
2145 	int ret;
2146 
2147 	if (*delim != '=')
2148 		return -EINVAL;
2149 
2150 	value = delim + 1;
2151 	delim = strchr(value, ',');
2152 	if (!delim)
2153 		delim = value + strlen(value);
2154 
2155 	ret = drm_get_tv_mode_from_name(value, delim - value);
2156 	if (ret < 0)
2157 		return ret;
2158 
2159 	mode->tv_mode_specified = true;
2160 	mode->tv_mode = ret;
2161 
2162 	return 0;
2163 }
2164 
drm_mode_parse_cmdline_options(const char * str,bool freestanding,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2165 static int drm_mode_parse_cmdline_options(const char *str,
2166 					  bool freestanding,
2167 					  const struct drm_connector *connector,
2168 					  struct drm_cmdline_mode *mode)
2169 {
2170 	unsigned int deg, margin, rotation = 0;
2171 	const char *delim, *option, *sep;
2172 
2173 	option = str;
2174 	do {
2175 		delim = strchr(option, '=');
2176 		if (!delim) {
2177 			delim = strchr(option, ',');
2178 
2179 			if (!delim)
2180 				delim = option + strlen(option);
2181 		}
2182 
2183 		if (!strncmp(option, "rotate", delim - option)) {
2184 			if (drm_mode_parse_cmdline_int(delim, &deg))
2185 				return -EINVAL;
2186 
2187 			switch (deg) {
2188 			case 0:
2189 				rotation |= DRM_MODE_ROTATE_0;
2190 				break;
2191 
2192 			case 90:
2193 				rotation |= DRM_MODE_ROTATE_90;
2194 				break;
2195 
2196 			case 180:
2197 				rotation |= DRM_MODE_ROTATE_180;
2198 				break;
2199 
2200 			case 270:
2201 				rotation |= DRM_MODE_ROTATE_270;
2202 				break;
2203 
2204 			default:
2205 				return -EINVAL;
2206 			}
2207 		} else if (!strncmp(option, "reflect_x", delim - option)) {
2208 			rotation |= DRM_MODE_REFLECT_X;
2209 		} else if (!strncmp(option, "reflect_y", delim - option)) {
2210 			rotation |= DRM_MODE_REFLECT_Y;
2211 		} else if (!strncmp(option, "margin_right", delim - option)) {
2212 			if (drm_mode_parse_cmdline_int(delim, &margin))
2213 				return -EINVAL;
2214 
2215 			mode->tv_margins.right = margin;
2216 		} else if (!strncmp(option, "margin_left", delim - option)) {
2217 			if (drm_mode_parse_cmdline_int(delim, &margin))
2218 				return -EINVAL;
2219 
2220 			mode->tv_margins.left = margin;
2221 		} else if (!strncmp(option, "margin_top", delim - option)) {
2222 			if (drm_mode_parse_cmdline_int(delim, &margin))
2223 				return -EINVAL;
2224 
2225 			mode->tv_margins.top = margin;
2226 		} else if (!strncmp(option, "margin_bottom", delim - option)) {
2227 			if (drm_mode_parse_cmdline_int(delim, &margin))
2228 				return -EINVAL;
2229 
2230 			mode->tv_margins.bottom = margin;
2231 		} else if (!strncmp(option, "panel_orientation", delim - option)) {
2232 			if (drm_mode_parse_panel_orientation(delim, mode))
2233 				return -EINVAL;
2234 		} else if (!strncmp(option, "tv_mode", delim - option)) {
2235 			if (drm_mode_parse_tv_mode(delim, mode))
2236 				return -EINVAL;
2237 		} else {
2238 			return -EINVAL;
2239 		}
2240 		sep = strchr(delim, ',');
2241 		option = sep + 1;
2242 	} while (sep);
2243 
2244 	if (rotation && freestanding)
2245 		return -EINVAL;
2246 
2247 	if (!(rotation & DRM_MODE_ROTATE_MASK))
2248 		rotation |= DRM_MODE_ROTATE_0;
2249 
2250 	/* Make sure there is exactly one rotation defined */
2251 	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
2252 		return -EINVAL;
2253 
2254 	mode->rotation_reflection = rotation;
2255 
2256 	return 0;
2257 }
2258 
2259 struct drm_named_mode {
2260 	const char *name;
2261 	unsigned int pixel_clock_khz;
2262 	unsigned int xres;
2263 	unsigned int yres;
2264 	unsigned int flags;
2265 	unsigned int tv_mode;
2266 };
2267 
2268 #define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode)	\
2269 	{						\
2270 		.name = _name,				\
2271 		.pixel_clock_khz = _pclk,		\
2272 		.xres = _x,				\
2273 		.yres = _y,				\
2274 		.flags = _flags,			\
2275 		.tv_mode = _mode,			\
2276 	}
2277 
2278 static const struct drm_named_mode drm_named_modes[] = {
2279 	NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2280 	NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2281 	NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2282 	NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2283 };
2284 
drm_mode_parse_cmdline_named_mode(const char * name,unsigned int name_end,struct drm_cmdline_mode * cmdline_mode)2285 static int drm_mode_parse_cmdline_named_mode(const char *name,
2286 					     unsigned int name_end,
2287 					     struct drm_cmdline_mode *cmdline_mode)
2288 {
2289 	unsigned int i;
2290 
2291 	if (!name_end)
2292 		return 0;
2293 
2294 	/* If the name starts with a digit, it's not a named mode */
2295 	if (isdigit(name[0]))
2296 		return 0;
2297 
2298 	/*
2299 	 * If there's an equal sign in the name, the command-line
2300 	 * contains only an option and no mode.
2301 	 */
2302 	if (strnchr(name, name_end, '='))
2303 		return 0;
2304 
2305 	/* The connection status extras can be set without a mode. */
2306 	if (name_end == 1 &&
2307 	    (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2308 		return 0;
2309 
2310 	/*
2311 	 * We're sure we're a named mode at this point, iterate over the
2312 	 * list of modes we're aware of.
2313 	 */
2314 	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2315 		const struct drm_named_mode *mode = &drm_named_modes[i];
2316 		int ret;
2317 
2318 		ret = str_has_prefix(name, mode->name);
2319 		if (ret != name_end)
2320 			continue;
2321 
2322 		strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2323 		cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2324 		cmdline_mode->xres = mode->xres;
2325 		cmdline_mode->yres = mode->yres;
2326 		cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2327 		cmdline_mode->tv_mode = mode->tv_mode;
2328 		cmdline_mode->tv_mode_specified = true;
2329 		cmdline_mode->specified = true;
2330 
2331 		return 1;
2332 	}
2333 
2334 	return -EINVAL;
2335 }
2336 
2337 /**
2338  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2339  * @mode_option: optional per connector mode option
2340  * @connector: connector to parse modeline for
2341  * @mode: preallocated drm_cmdline_mode structure to fill out
2342  *
2343  * This parses @mode_option command line modeline for modes and options to
2344  * configure the connector.
2345  *
2346  * This uses the same parameters as the fb modedb.c, except for an extra
2347  * force-enable, force-enable-digital and force-disable bit at the end::
2348  *
2349  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2350  *
2351  * Additionals options can be provided following the mode, using a comma to
2352  * separate each option. Valid options can be found in
2353  * Documentation/fb/modedb.rst.
2354  *
2355  * The intermediate drm_cmdline_mode structure is required to store additional
2356  * options from the command line modline like the force-enable/disable flag.
2357  *
2358  * Returns:
2359  * True if a valid modeline has been parsed, false otherwise.
2360  */
drm_mode_parse_command_line_for_connector(const char * mode_option,const struct drm_connector * connector,struct drm_cmdline_mode * mode)2361 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2362 					       const struct drm_connector *connector,
2363 					       struct drm_cmdline_mode *mode)
2364 {
2365 	const char *name;
2366 	bool freestanding = false, parse_extras = false;
2367 	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2368 	unsigned int mode_end = 0;
2369 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2370 	const char *options_ptr = NULL;
2371 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2372 	int len, ret;
2373 
2374 	memset(mode, 0, sizeof(*mode));
2375 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2376 
2377 	if (!mode_option)
2378 		return false;
2379 
2380 	name = mode_option;
2381 
2382 	/* Locate the start of named options */
2383 	options_ptr = strchr(name, ',');
2384 	if (options_ptr)
2385 		options_off = options_ptr - name;
2386 	else
2387 		options_off = strlen(name);
2388 
2389 	/* Try to locate the bpp and refresh specifiers, if any */
2390 	bpp_ptr = strnchr(name, options_off, '-');
2391 	while (bpp_ptr && !isdigit(bpp_ptr[1]))
2392 		bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2393 	if (bpp_ptr)
2394 		bpp_off = bpp_ptr - name;
2395 
2396 	refresh_ptr = strnchr(name, options_off, '@');
2397 	if (refresh_ptr)
2398 		refresh_off = refresh_ptr - name;
2399 
2400 	/* Locate the end of the name / resolution, and parse it */
2401 	if (bpp_ptr) {
2402 		mode_end = bpp_off;
2403 	} else if (refresh_ptr) {
2404 		mode_end = refresh_off;
2405 	} else if (options_ptr) {
2406 		mode_end = options_off;
2407 		parse_extras = true;
2408 	} else {
2409 		mode_end = strlen(name);
2410 		parse_extras = true;
2411 	}
2412 
2413 	if (!mode_end)
2414 		return false;
2415 
2416 	ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
2417 	if (ret < 0)
2418 		return false;
2419 
2420 	/*
2421 	 * Having a mode that starts by a letter (and thus is named) and
2422 	 * an at-sign (used to specify a refresh rate) is disallowed.
2423 	 */
2424 	if (ret && refresh_ptr)
2425 		return false;
2426 
2427 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2428 	if (!mode->specified && isdigit(name[0])) {
2429 		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
2430 						      parse_extras,
2431 						      connector,
2432 						      mode);
2433 		if (ret)
2434 			return false;
2435 
2436 		mode->specified = true;
2437 	}
2438 
2439 	/* No mode? Check for freestanding extras and/or options */
2440 	if (!mode->specified) {
2441 		unsigned int len = strlen(mode_option);
2442 
2443 		if (bpp_ptr || refresh_ptr)
2444 			return false; /* syntax error */
2445 
2446 		if (len == 1 || (len >= 2 && mode_option[1] == ','))
2447 			extra_ptr = mode_option;
2448 		else
2449 			options_ptr = mode_option - 1;
2450 
2451 		freestanding = true;
2452 	}
2453 
2454 	if (bpp_ptr) {
2455 		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
2456 		if (ret)
2457 			return false;
2458 
2459 		mode->bpp_specified = true;
2460 	}
2461 
2462 	if (refresh_ptr) {
2463 		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
2464 						     &refresh_end_ptr, mode);
2465 		if (ret)
2466 			return false;
2467 
2468 		mode->refresh_specified = true;
2469 	}
2470 
2471 	/*
2472 	 * Locate the end of the bpp / refresh, and parse the extras
2473 	 * if relevant
2474 	 */
2475 	if (bpp_ptr && refresh_ptr)
2476 		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2477 	else if (bpp_ptr)
2478 		extra_ptr = bpp_end_ptr;
2479 	else if (refresh_ptr)
2480 		extra_ptr = refresh_end_ptr;
2481 
2482 	if (extra_ptr) {
2483 		if (options_ptr)
2484 			len = options_ptr - extra_ptr;
2485 		else
2486 			len = strlen(extra_ptr);
2487 
2488 		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
2489 						   connector, mode);
2490 		if (ret)
2491 			return false;
2492 	}
2493 
2494 	if (options_ptr) {
2495 		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
2496 						     freestanding,
2497 						     connector, mode);
2498 		if (ret)
2499 			return false;
2500 	}
2501 
2502 	return true;
2503 }
2504 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2505 
drm_named_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)2506 static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2507 					       struct drm_cmdline_mode *cmd)
2508 {
2509 	unsigned int i;
2510 
2511 	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2512 		const struct drm_named_mode *named_mode = &drm_named_modes[i];
2513 
2514 		if (strcmp(cmd->name, named_mode->name))
2515 			continue;
2516 
2517 		if (!cmd->tv_mode_specified)
2518 			continue;
2519 
2520 		return drm_analog_tv_mode(dev,
2521 					  named_mode->tv_mode,
2522 					  named_mode->pixel_clock_khz * 1000,
2523 					  named_mode->xres,
2524 					  named_mode->yres,
2525 					  named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2526 	}
2527 
2528 	return NULL;
2529 }
2530 
2531 /**
2532  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2533  * @dev: DRM device to create the new mode for
2534  * @cmd: input command line modeline
2535  *
2536  * Returns:
2537  * Pointer to converted mode on success, NULL on error.
2538  */
2539 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)2540 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2541 				  struct drm_cmdline_mode *cmd)
2542 {
2543 	struct drm_display_mode *mode;
2544 
2545 	if (cmd->xres == 0 || cmd->yres == 0)
2546 		return NULL;
2547 
2548 	if (strlen(cmd->name))
2549 		mode = drm_named_mode(dev, cmd);
2550 	else if (cmd->cvt)
2551 		mode = drm_cvt_mode(dev,
2552 				    cmd->xres, cmd->yres,
2553 				    cmd->refresh_specified ? cmd->refresh : 60,
2554 				    cmd->rb, cmd->interlace,
2555 				    cmd->margins);
2556 	else
2557 		mode = drm_gtf_mode(dev,
2558 				    cmd->xres, cmd->yres,
2559 				    cmd->refresh_specified ? cmd->refresh : 60,
2560 				    cmd->interlace,
2561 				    cmd->margins);
2562 	if (!mode)
2563 		return NULL;
2564 
2565 	mode->type |= DRM_MODE_TYPE_USERDEF;
2566 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2567 	if (cmd->xres == 1366)
2568 		drm_mode_fixup_1366x768(mode);
2569 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2570 	return mode;
2571 }
2572 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2573 
2574 /**
2575  * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2576  * @out: drm_mode_modeinfo struct to return to the user
2577  * @in: drm_display_mode to use
2578  *
2579  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2580  * the user.
2581  */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)2582 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2583 			       const struct drm_display_mode *in)
2584 {
2585 	out->clock = in->clock;
2586 	out->hdisplay = in->hdisplay;
2587 	out->hsync_start = in->hsync_start;
2588 	out->hsync_end = in->hsync_end;
2589 	out->htotal = in->htotal;
2590 	out->hskew = in->hskew;
2591 	out->vdisplay = in->vdisplay;
2592 	out->vsync_start = in->vsync_start;
2593 	out->vsync_end = in->vsync_end;
2594 	out->vtotal = in->vtotal;
2595 	out->vscan = in->vscan;
2596 	out->vrefresh = drm_mode_vrefresh(in);
2597 	out->flags = in->flags;
2598 	out->type = in->type;
2599 
2600 	switch (in->picture_aspect_ratio) {
2601 	case HDMI_PICTURE_ASPECT_4_3:
2602 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2603 		break;
2604 	case HDMI_PICTURE_ASPECT_16_9:
2605 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2606 		break;
2607 	case HDMI_PICTURE_ASPECT_64_27:
2608 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2609 		break;
2610 	case HDMI_PICTURE_ASPECT_256_135:
2611 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2612 		break;
2613 	default:
2614 		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2615 		     in->picture_aspect_ratio);
2616 		fallthrough;
2617 	case HDMI_PICTURE_ASPECT_NONE:
2618 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2619 		break;
2620 	}
2621 
2622 	strscpy_pad(out->name, in->name, sizeof(out->name));
2623 }
2624 
2625 /**
2626  * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2627  * @dev: drm device
2628  * @out: drm_display_mode to return to the user
2629  * @in: drm_mode_modeinfo to use
2630  *
2631  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2632  * the caller.
2633  *
2634  * Returns:
2635  * Zero on success, negative errno on failure.
2636  */
drm_mode_convert_umode(struct drm_device * dev,struct drm_display_mode * out,const struct drm_mode_modeinfo * in)2637 int drm_mode_convert_umode(struct drm_device *dev,
2638 			   struct drm_display_mode *out,
2639 			   const struct drm_mode_modeinfo *in)
2640 {
2641 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2642 		return -ERANGE;
2643 
2644 	out->clock = in->clock;
2645 	out->hdisplay = in->hdisplay;
2646 	out->hsync_start = in->hsync_start;
2647 	out->hsync_end = in->hsync_end;
2648 	out->htotal = in->htotal;
2649 	out->hskew = in->hskew;
2650 	out->vdisplay = in->vdisplay;
2651 	out->vsync_start = in->vsync_start;
2652 	out->vsync_end = in->vsync_end;
2653 	out->vtotal = in->vtotal;
2654 	out->vscan = in->vscan;
2655 	out->flags = in->flags;
2656 	/*
2657 	 * Old xf86-video-vmware (possibly others too) used to
2658 	 * leave 'type' uninitialized. Just ignore any bits we
2659 	 * don't like. It's a just hint after all, and more
2660 	 * useful for the kernel->userspace direction anyway.
2661 	 */
2662 	out->type = in->type & DRM_MODE_TYPE_ALL;
2663 	strscpy_pad(out->name, in->name, sizeof(out->name));
2664 
2665 	/* Clearing picture aspect ratio bits from out flags,
2666 	 * as the aspect-ratio information is not stored in
2667 	 * flags for kernel-mode, but in picture_aspect_ratio.
2668 	 */
2669 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2670 
2671 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2672 	case DRM_MODE_FLAG_PIC_AR_4_3:
2673 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2674 		break;
2675 	case DRM_MODE_FLAG_PIC_AR_16_9:
2676 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2677 		break;
2678 	case DRM_MODE_FLAG_PIC_AR_64_27:
2679 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2680 		break;
2681 	case DRM_MODE_FLAG_PIC_AR_256_135:
2682 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2683 		break;
2684 	case DRM_MODE_FLAG_PIC_AR_NONE:
2685 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2686 		break;
2687 	default:
2688 		return -EINVAL;
2689 	}
2690 
2691 	out->status = drm_mode_validate_driver(dev, out);
2692 	if (out->status != MODE_OK)
2693 		return -EINVAL;
2694 
2695 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2696 
2697 	return 0;
2698 }
2699 
2700 /**
2701  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2702  * output format
2703  *
2704  * @display: display under action
2705  * @mode: video mode to be tested.
2706  *
2707  * Returns:
2708  * true if the mode can be supported in YCBCR420 format
2709  * false if not.
2710  */
drm_mode_is_420_only(const struct drm_display_info * display,const struct drm_display_mode * mode)2711 bool drm_mode_is_420_only(const struct drm_display_info *display,
2712 			  const struct drm_display_mode *mode)
2713 {
2714 	u8 vic = drm_match_cea_mode(mode);
2715 
2716 	return test_bit(vic, display->hdmi.y420_vdb_modes);
2717 }
2718 EXPORT_SYMBOL(drm_mode_is_420_only);
2719 
2720 /**
2721  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2722  * output format also (along with RGB/YCBCR444/422)
2723  *
2724  * @display: display under action.
2725  * @mode: video mode to be tested.
2726  *
2727  * Returns:
2728  * true if the mode can be support YCBCR420 format
2729  * false if not.
2730  */
drm_mode_is_420_also(const struct drm_display_info * display,const struct drm_display_mode * mode)2731 bool drm_mode_is_420_also(const struct drm_display_info *display,
2732 			  const struct drm_display_mode *mode)
2733 {
2734 	u8 vic = drm_match_cea_mode(mode);
2735 
2736 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2737 }
2738 EXPORT_SYMBOL(drm_mode_is_420_also);
2739 /**
2740  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2741  * output format
2742  *
2743  * @display: display under action.
2744  * @mode: video mode to be tested.
2745  *
2746  * Returns:
2747  * true if the mode can be supported in YCBCR420 format
2748  * false if not.
2749  */
drm_mode_is_420(const struct drm_display_info * display,const struct drm_display_mode * mode)2750 bool drm_mode_is_420(const struct drm_display_info *display,
2751 		     const struct drm_display_mode *mode)
2752 {
2753 	return drm_mode_is_420_only(display, mode) ||
2754 		drm_mode_is_420_also(display, mode);
2755 }
2756 EXPORT_SYMBOL(drm_mode_is_420);
2757 
2758 /**
2759  * drm_set_preferred_mode - Sets the preferred mode of a connector
2760  * @connector: connector whose mode list should be processed
2761  * @hpref: horizontal resolution of preferred mode
2762  * @vpref: vertical resolution of preferred mode
2763  *
2764  * Marks a mode as preferred if it matches the resolution specified by @hpref
2765  * and @vpref.
2766  */
drm_set_preferred_mode(struct drm_connector * connector,int hpref,int vpref)2767 void drm_set_preferred_mode(struct drm_connector *connector,
2768 			    int hpref, int vpref)
2769 {
2770 	struct drm_display_mode *mode;
2771 
2772 	list_for_each_entry(mode, &connector->probed_modes, head) {
2773 		if (mode->hdisplay == hpref &&
2774 		    mode->vdisplay == vpref)
2775 			mode->type |= DRM_MODE_TYPE_PREFERRED;
2776 	}
2777 }
2778 EXPORT_SYMBOL(drm_set_preferred_mode);
2779