2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
6 * Copyright 2005-2006 Luc Verhaegen
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
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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:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
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
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24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
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
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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>
40 #include <video/of_display_timing.h>
41 #include <video/of_videomode.h>
42 #include <video/videomode.h>
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>
50 #include "drm_crtc_internal.h"
53 * drm_mode_debug_printmodeline - print a mode to dmesg
54 * @mode: mode to print
56 * Describe @mode using DRM_DEBUG.
58 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
60 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
62 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
65 * drm_mode_create - create a new display mode
68 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
72 * Pointer to new mode on success, NULL on error.
74 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
76 struct drm_display_mode *nmode;
78 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
84 EXPORT_SYMBOL(drm_mode_create);
87 * drm_mode_destroy - remove a mode
89 * @mode: mode to remove
91 * Release @mode's unique ID, then free it @mode structure itself using kfree.
93 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
100 EXPORT_SYMBOL(drm_mode_destroy);
103 * drm_mode_probed_add - add a mode to a connector's probed_mode list
104 * @connector: connector the new mode
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.
111 void drm_mode_probed_add(struct drm_connector *connector,
112 struct drm_display_mode *mode)
114 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
116 list_add_tail(&mode->head, &connector->probed_modes);
118 EXPORT_SYMBOL(drm_mode_probed_add);
120 enum drm_mode_analog {
121 DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
122 DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
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
131 #define NTSC_LINE_DURATION_NS 63556U
132 #define NTSC_LINES_NUMBER 525
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)
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)
142 #define NTSC_HFP_DURATION_TYP_NS 1500
143 #define NTSC_HFP_DURATION_MIN_NS 1270
144 #define NTSC_HFP_DURATION_MAX_NS 2220
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)
150 #define NTSC_HBP_DURATION_TYP_NS 4700
153 * I couldn't find the actual tolerance for the back porch, so let's
154 * just reuse the sync length ones.
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)
159 #define PAL_LINE_DURATION_NS 64000U
160 #define PAL_LINES_NUMBER 625
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)
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)
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)
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)
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)
182 struct analog_param_field {
183 unsigned int even, odd;
186 #define PARAM_FIELD(_odd, _even) \
187 { .even = _even, .odd = _odd }
189 struct analog_param_range {
190 unsigned int min, typ, max;
193 #define PARAM_RANGE(_min, _typ, _max) \
194 { .min = _min, .typ = _typ, .max = _max }
196 struct analog_parameters {
197 unsigned int num_lines;
198 unsigned int line_duration_ns;
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;
206 unsigned int bt601_hfp;
208 struct analog_param_field vfp_lines;
209 struct analog_param_field vslen_lines;
210 struct analog_param_field vbp_lines;
213 #define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, \
214 _hslen, _hbp, _hblk, _bt601_hfp, _vfp, \
217 .num_lines = _lines, \
218 .line_duration_ns = _line_dur, \
221 .hslen_ns = _hslen, \
224 .bt601_hfp = _bt601_hfp, \
226 .vslen_lines = _vslen, \
230 static const struct analog_parameters tv_modes_parameters[] = {
231 TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
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),
252 PARAM_FIELD(16, 17)),
253 TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
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),
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
280 * In progressive, we're supposed to use 6
281 * pulses, so we're fine there
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.
290 * In progressive, we're supposed to use 5
291 * pulses, so we're off by half
294 * In interlace, we're now off by half a line
295 * for the even field and one line for the odd
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.
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.
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.
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
322 PARAM_FIELD(19, 20)),
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,
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;
349 "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
351 interlace ? 'i' : 'p',
353 pixel_clock_hz / 1000);
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");
362 * Our pixel duration is going to be round down by the division,
363 * so rounding up is probably going to introduce even more
366 result = (u64)params->line_duration_ns * pixel_clock_hz;
367 do_div(result, NSEC_PER_SEC);
370 drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
372 hact_duration_ns = hactive * pixel_duration_ns;
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);
381 hblk = htotal - hactive;
382 drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
384 hblk_duration_ns = hblk * pixel_duration_ns;
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);
393 hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
394 drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
396 hslen_duration_ns = hslen * pixel_duration_ns;
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);
405 porches = hblk - hslen;
406 drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
408 porches_duration_ns = porches * pixel_duration_ns;
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);
418 hfp = params->bt601_hfp;
420 unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
422 unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
424 int porches_rem = porches - hfp_min - hbp_min;
426 hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
429 drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
431 hfp_duration_ns = hfp * pixel_duration_ns;
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);
441 drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
443 hbp_duration_ns = hbp * pixel_duration_ns;
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);
452 if (htotal != (hactive + hfp + hslen + hbp))
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;
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;
467 * By convention, NTSC (aka 525/60) systems start with
468 * the even field, but PAL (aka 625/50) systems start
471 * PAL systems also have asymmetric timings between the
472 * even and odd field, while NTSC is symmetric.
474 * Moreover, if we want to create a progressive mode for
475 * PAL, we need to use the odd field timings.
477 * Since odd == even for NTSC, we can just use the odd
478 * one all the time to simplify the code a bit.
480 vfp_min = params->vfp_lines.odd;
481 vbp_min = params->vbp_lines.odd;
482 vslen = params->vslen_lines.odd;
485 drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
487 porches = params->num_lines - vactive - vslen;
488 drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
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);
495 drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
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);
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;
509 if (mode->vtotal != params->num_lines)
512 mode->type = DRM_MODE_TYPE_DRIVER;
513 mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
515 mode->flags |= DRM_MODE_FLAG_INTERLACE;
517 drm_mode_set_name(mode);
519 drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
525 * drm_analog_tv_mode - create a display mode for an analog TV
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
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.
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.
543 * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
546 struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
547 enum drm_connector_tv_mode tv_mode,
548 unsigned long pixel_clock_hz,
549 unsigned int hdisplay,
550 unsigned int vdisplay,
553 struct drm_display_mode *mode;
554 enum drm_mode_analog analog;
558 case DRM_MODE_TV_MODE_NTSC:
560 case DRM_MODE_TV_MODE_NTSC_443:
562 case DRM_MODE_TV_MODE_NTSC_J:
564 case DRM_MODE_TV_MODE_PAL_M:
565 analog = DRM_MODE_ANALOG_NTSC;
568 case DRM_MODE_TV_MODE_PAL:
570 case DRM_MODE_TV_MODE_PAL_N:
572 case DRM_MODE_TV_MODE_SECAM:
574 case DRM_MODE_TV_MODE_MONOCHROME:
575 analog = DRM_MODE_ANALOG_PAL;
582 mode = drm_mode_create(dev);
586 ret = fill_analog_mode(dev, mode,
587 &tv_modes_parameters[analog],
588 pixel_clock_hz, hdisplay, vdisplay, interlace);
595 drm_mode_destroy(dev, mode);
598 EXPORT_SYMBOL(drm_analog_tv_mode);
601 * drm_cvt_mode -create a modeline based on the CVT algorithm
603 * @hdisplay: hdisplay size
604 * @vdisplay: vdisplay size
605 * @vrefresh: vrefresh rate
606 * @reduced: whether to use reduced blanking
607 * @interlaced: whether to compute an interlaced mode
608 * @margins: whether to add margins (borders)
610 * This function is called to generate the modeline based on CVT algorithm
611 * according to the hdisplay, vdisplay, vrefresh.
612 * It is based from the VESA(TM) Coordinated Video Timing Generator by
613 * Graham Loveridge April 9, 2003 available at
614 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
616 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
617 * What I have done is to translate it by using integer calculation.
620 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
621 * The display mode object is allocated with drm_mode_create(). Returns NULL
622 * when no mode could be allocated.
624 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
625 int vdisplay, int vrefresh,
626 bool reduced, bool interlaced, bool margins)
628 #define HV_FACTOR 1000
629 /* 1) top/bottom margin size (% of height) - default: 1.8, */
630 #define CVT_MARGIN_PERCENTAGE 18
631 /* 2) character cell horizontal granularity (pixels) - default 8 */
632 #define CVT_H_GRANULARITY 8
633 /* 3) Minimum vertical porch (lines) - default 3 */
634 #define CVT_MIN_V_PORCH 3
635 /* 4) Minimum number of vertical back porch lines - default 6 */
636 #define CVT_MIN_V_BPORCH 6
637 /* Pixel Clock step (kHz) */
638 #define CVT_CLOCK_STEP 250
639 struct drm_display_mode *drm_mode;
640 unsigned int vfieldrate, hperiod;
641 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
645 if (!hdisplay || !vdisplay)
648 /* allocate the drm_display_mode structure. If failure, we will
651 drm_mode = drm_mode_create(dev);
655 /* the CVT default refresh rate is 60Hz */
659 /* the required field fresh rate */
661 vfieldrate = vrefresh * 2;
663 vfieldrate = vrefresh;
665 /* horizontal pixels */
666 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
668 /* determine the left&right borders */
671 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
672 hmargin -= hmargin % CVT_H_GRANULARITY;
674 /* find the total active pixels */
675 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
677 /* find the number of lines per field */
679 vdisplay_rnd = vdisplay / 2;
681 vdisplay_rnd = vdisplay;
683 /* find the top & bottom borders */
686 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
688 drm_mode->vdisplay = vdisplay + 2 * vmargin;
696 /* Determine VSync Width from aspect ratio */
697 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
699 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
701 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
703 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
705 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
711 /* simplify the GTF calculation */
712 /* 4) Minimum time of vertical sync + back porch interval (µs)
716 #define CVT_MIN_VSYNC_BP 550
717 /* 3) Nominal HSync width (% of line period) - default 8 */
718 #define CVT_HSYNC_PERCENTAGE 8
719 unsigned int hblank_percentage;
720 int vsyncandback_porch, __maybe_unused vback_porch, hblank;
722 /* estimated the horizontal period */
723 tmp1 = HV_FACTOR * 1000000 -
724 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
725 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
727 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
729 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
730 /* 9. Find number of lines in sync + backporch */
731 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
732 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
734 vsyncandback_porch = tmp1;
735 /* 10. Find number of lines in back porch */
736 vback_porch = vsyncandback_porch - vsync;
737 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
738 vsyncandback_porch + CVT_MIN_V_PORCH;
739 /* 5) Definition of Horizontal blanking time limitation */
740 /* Gradient (%/kHz) - default 600 */
741 #define CVT_M_FACTOR 600
742 /* Offset (%) - default 40 */
743 #define CVT_C_FACTOR 40
744 /* Blanking time scaling factor - default 128 */
745 #define CVT_K_FACTOR 128
746 /* Scaling factor weighting - default 20 */
747 #define CVT_J_FACTOR 20
748 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
749 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
751 /* 12. Find ideal blanking duty cycle from formula */
752 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
754 /* 13. Blanking time */
755 if (hblank_percentage < 20 * HV_FACTOR)
756 hblank_percentage = 20 * HV_FACTOR;
757 hblank = drm_mode->hdisplay * hblank_percentage /
758 (100 * HV_FACTOR - hblank_percentage);
759 hblank -= hblank % (2 * CVT_H_GRANULARITY);
760 /* 14. find the total pixels per line */
761 drm_mode->htotal = drm_mode->hdisplay + hblank;
762 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
763 drm_mode->hsync_start = drm_mode->hsync_end -
764 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
765 drm_mode->hsync_start += CVT_H_GRANULARITY -
766 drm_mode->hsync_start % CVT_H_GRANULARITY;
767 /* fill the Vsync values */
768 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
769 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
771 /* Reduced blanking */
772 /* Minimum vertical blanking interval time (µs)- default 460 */
773 #define CVT_RB_MIN_VBLANK 460
774 /* Fixed number of clocks for horizontal sync */
775 #define CVT_RB_H_SYNC 32
776 /* Fixed number of clocks for horizontal blanking */
777 #define CVT_RB_H_BLANK 160
778 /* Fixed number of lines for vertical front porch - default 3*/
779 #define CVT_RB_VFPORCH 3
782 /* 8. Estimate Horizontal period. */
783 tmp1 = HV_FACTOR * 1000000 -
784 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
785 tmp2 = vdisplay_rnd + 2 * vmargin;
786 hperiod = tmp1 / (tmp2 * vfieldrate);
787 /* 9. Find number of lines in vertical blanking */
788 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
789 /* 10. Check if vertical blanking is sufficient */
790 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
791 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
792 /* 11. Find total number of lines in vertical field */
793 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
794 /* 12. Find total number of pixels in a line */
795 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
796 /* Fill in HSync values */
797 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
798 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
799 /* Fill in VSync values */
800 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
801 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
803 /* 15/13. Find pixel clock frequency (kHz for xf86) */
804 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
805 tmp *= HV_FACTOR * 1000;
806 do_div(tmp, hperiod);
807 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
808 drm_mode->clock = tmp;
809 /* 18/16. Find actual vertical frame frequency */
810 /* ignore - just set the mode flag for interlaced */
812 drm_mode->vtotal *= 2;
813 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
815 /* Fill the mode line name */
816 drm_mode_set_name(drm_mode);
818 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
819 DRM_MODE_FLAG_NVSYNC);
821 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
822 DRM_MODE_FLAG_NHSYNC);
826 EXPORT_SYMBOL(drm_cvt_mode);
829 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
831 * @hdisplay: hdisplay size
832 * @vdisplay: vdisplay size
833 * @vrefresh: vrefresh rate.
834 * @interlaced: whether to compute an interlaced mode
835 * @margins: desired margin (borders) size
836 * @GTF_M: extended GTF formula parameters
837 * @GTF_2C: extended GTF formula parameters
838 * @GTF_K: extended GTF formula parameters
839 * @GTF_2J: extended GTF formula parameters
841 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
842 * in here multiplied by two. For a C of 40, pass in 80.
845 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
846 * The display mode object is allocated with drm_mode_create(). Returns NULL
847 * when no mode could be allocated.
849 struct drm_display_mode *
850 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
851 int vrefresh, bool interlaced, int margins,
852 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
853 { /* 1) top/bottom margin size (% of height) - default: 1.8, */
854 #define GTF_MARGIN_PERCENTAGE 18
855 /* 2) character cell horizontal granularity (pixels) - default 8 */
856 #define GTF_CELL_GRAN 8
857 /* 3) Minimum vertical porch (lines) - default 3 */
858 #define GTF_MIN_V_PORCH 1
859 /* width of vsync in lines */
861 /* width of hsync as % of total line */
862 #define H_SYNC_PERCENT 8
863 /* min time of vsync + back porch (microsec) */
864 #define MIN_VSYNC_PLUS_BP 550
865 /* C' and M' are part of the Blanking Duty Cycle computation */
866 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
867 #define GTF_M_PRIME (GTF_K * GTF_M / 256)
868 struct drm_display_mode *drm_mode;
869 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
870 int top_margin, bottom_margin;
872 unsigned int hfreq_est;
873 int vsync_plus_bp, __maybe_unused vback_porch;
874 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
875 unsigned int __maybe_unused hperiod;
876 unsigned int vfield_rate, __maybe_unused vframe_rate;
877 int left_margin, right_margin;
878 unsigned int total_active_pixels, ideal_duty_cycle;
879 unsigned int hblank, total_pixels, pixel_freq;
880 int hsync, hfront_porch, vodd_front_porch_lines;
881 unsigned int tmp1, tmp2;
883 if (!hdisplay || !vdisplay)
886 drm_mode = drm_mode_create(dev);
890 /* 1. In order to give correct results, the number of horizontal
891 * pixels requested is first processed to ensure that it is divisible
892 * by the character size, by rounding it to the nearest character
895 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
896 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
898 /* 2. If interlace is requested, the number of vertical lines assumed
899 * by the calculation must be halved, as the computation calculates
900 * the number of vertical lines per field.
903 vdisplay_rnd = vdisplay / 2;
905 vdisplay_rnd = vdisplay;
907 /* 3. Find the frame rate required: */
909 vfieldrate_rqd = vrefresh * 2;
911 vfieldrate_rqd = vrefresh;
913 /* 4. Find number of lines in Top margin: */
916 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
918 /* 5. Find number of lines in bottom margin: */
919 bottom_margin = top_margin;
921 /* 6. If interlace is required, then set variable interlace: */
927 /* 7. Estimate the Horizontal frequency */
929 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
930 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
932 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
935 /* 8. Find the number of lines in V sync + back porch */
936 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
937 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
938 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
939 /* 9. Find the number of lines in V back porch alone: */
940 vback_porch = vsync_plus_bp - V_SYNC_RQD;
941 /* 10. Find the total number of lines in Vertical field period: */
942 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
943 vsync_plus_bp + GTF_MIN_V_PORCH;
944 /* 11. Estimate the Vertical field frequency: */
945 vfieldrate_est = hfreq_est / vtotal_lines;
946 /* 12. Find the actual horizontal period: */
947 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
949 /* 13. Find the actual Vertical field frequency: */
950 vfield_rate = hfreq_est / vtotal_lines;
951 /* 14. Find the Vertical frame frequency: */
953 vframe_rate = vfield_rate / 2;
955 vframe_rate = vfield_rate;
956 /* 15. Find number of pixels in left margin: */
958 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
963 /* 16.Find number of pixels in right margin: */
964 right_margin = left_margin;
965 /* 17.Find total number of active pixels in image and left and right */
966 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
967 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
968 ideal_duty_cycle = GTF_C_PRIME * 1000 -
969 (GTF_M_PRIME * 1000000 / hfreq_est);
970 /* 19.Find the number of pixels in the blanking time to the nearest
971 * double character cell: */
972 hblank = total_active_pixels * ideal_duty_cycle /
973 (100000 - ideal_duty_cycle);
974 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
975 hblank = hblank * 2 * GTF_CELL_GRAN;
976 /* 20.Find total number of pixels: */
977 total_pixels = total_active_pixels + hblank;
978 /* 21.Find pixel clock frequency: */
979 pixel_freq = total_pixels * hfreq_est / 1000;
980 /* Stage 1 computations are now complete; I should really pass
981 * the results to another function and do the Stage 2 computations,
982 * but I only need a few more values so I'll just append the
983 * computations here for now */
984 /* 17. Find the number of pixels in the horizontal sync period: */
985 hsync = H_SYNC_PERCENT * total_pixels / 100;
986 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
987 hsync = hsync * GTF_CELL_GRAN;
988 /* 18. Find the number of pixels in horizontal front porch period */
989 hfront_porch = hblank / 2 - hsync;
990 /* 36. Find the number of lines in the odd front porch period: */
991 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
993 /* finally, pack the results in the mode struct */
994 drm_mode->hdisplay = hdisplay_rnd;
995 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
996 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
997 drm_mode->htotal = total_pixels;
998 drm_mode->vdisplay = vdisplay_rnd;
999 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
1000 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
1001 drm_mode->vtotal = vtotal_lines;
1003 drm_mode->clock = pixel_freq;
1006 drm_mode->vtotal *= 2;
1007 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1010 drm_mode_set_name(drm_mode);
1011 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1012 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1014 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1018 EXPORT_SYMBOL(drm_gtf_mode_complex);
1021 * drm_gtf_mode - create the modeline based on the GTF algorithm
1023 * @hdisplay: hdisplay size
1024 * @vdisplay: vdisplay size
1025 * @vrefresh: vrefresh rate.
1026 * @interlaced: whether to compute an interlaced mode
1027 * @margins: desired margin (borders) size
1029 * return the modeline based on GTF algorithm
1031 * This function is to create the modeline based on the GTF algorithm.
1032 * Generalized Timing Formula is derived from:
1034 * GTF Spreadsheet by Andy Morrish (1/5/97)
1035 * available at https://www.vesa.org
1037 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1038 * What I have done is to translate it by using integer calculation.
1039 * I also refer to the function of fb_get_mode in the file of
1040 * drivers/video/fbmon.c
1042 * Standard GTF parameters::
1050 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
1051 * The display mode object is allocated with drm_mode_create(). Returns NULL
1052 * when no mode could be allocated.
1054 struct drm_display_mode *
1055 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1056 bool interlaced, int margins)
1058 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1059 interlaced, margins,
1060 600, 40 * 2, 128, 20 * 2);
1062 EXPORT_SYMBOL(drm_gtf_mode);
1064 #ifdef CONFIG_VIDEOMODE_HELPERS
1066 * drm_display_mode_from_videomode - fill in @dmode using @vm,
1067 * @vm: videomode structure to use as source
1068 * @dmode: drm_display_mode structure to use as destination
1070 * Fills out @dmode using the display mode specified in @vm.
1072 void drm_display_mode_from_videomode(const struct videomode *vm,
1073 struct drm_display_mode *dmode)
1075 dmode->hdisplay = vm->hactive;
1076 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1077 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1078 dmode->htotal = dmode->hsync_end + vm->hback_porch;
1080 dmode->vdisplay = vm->vactive;
1081 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1082 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1083 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1085 dmode->clock = vm->pixelclock / 1000;
1088 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1089 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1090 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1091 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1092 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1093 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1094 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1095 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1096 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1097 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1098 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1099 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1100 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1101 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1102 drm_mode_set_name(dmode);
1104 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1107 * drm_display_mode_to_videomode - fill in @vm using @dmode,
1108 * @dmode: drm_display_mode structure to use as source
1109 * @vm: videomode structure to use as destination
1111 * Fills out @vm using the display mode specified in @dmode.
1113 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1114 struct videomode *vm)
1116 vm->hactive = dmode->hdisplay;
1117 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1118 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1119 vm->hback_porch = dmode->htotal - dmode->hsync_end;
1121 vm->vactive = dmode->vdisplay;
1122 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1123 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1124 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1126 vm->pixelclock = dmode->clock * 1000;
1129 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1130 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1131 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1132 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1133 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1134 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1135 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1136 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1137 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1138 vm->flags |= DISPLAY_FLAGS_INTERLACED;
1139 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1140 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1141 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1142 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1144 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1147 * drm_bus_flags_from_videomode - extract information about pixelclk and
1148 * DE polarity from videomode and store it in a separate variable
1149 * @vm: videomode structure to use
1150 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
1153 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1154 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1157 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1160 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1161 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1162 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1163 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1165 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1166 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1167 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1168 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1170 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1171 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
1172 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1173 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1175 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1179 * of_get_drm_display_mode - get a drm_display_mode from devicetree
1180 * @np: device_node with the timing specification
1181 * @dmode: will be set to the return value
1182 * @bus_flags: information about pixelclk, sync and DE polarity
1183 * @index: index into the list of display timings in devicetree
1185 * This function is expensive and should only be used, if only one mode is to be
1186 * read from DT. To get multiple modes start with of_get_display_timings and
1187 * work with that instead.
1190 * 0 on success, a negative errno code when no of videomode node was found.
1192 int of_get_drm_display_mode(struct device_node *np,
1193 struct drm_display_mode *dmode, u32 *bus_flags,
1196 struct videomode vm;
1199 ret = of_get_videomode(np, &vm, index);
1203 drm_display_mode_from_videomode(&vm, dmode);
1205 drm_bus_flags_from_videomode(&vm, bus_flags);
1207 pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n",
1208 np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode));
1212 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1215 * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1216 * @np: device_node with the panel-timing specification
1217 * @dmode: will be set to the return value
1218 * @bus_flags: information about pixelclk, sync and DE polarity
1220 * The mandatory Device Tree properties width-mm and height-mm
1221 * are read and set on the display mode.
1224 * Zero on success, negative error code on failure.
1226 int of_get_drm_panel_display_mode(struct device_node *np,
1227 struct drm_display_mode *dmode, u32 *bus_flags)
1229 u32 width_mm = 0, height_mm = 0;
1230 struct display_timing timing;
1231 struct videomode vm;
1234 ret = of_get_display_timing(np, "panel-timing", &timing);
1238 videomode_from_timing(&timing, &vm);
1240 memset(dmode, 0, sizeof(*dmode));
1241 drm_display_mode_from_videomode(&vm, dmode);
1243 drm_bus_flags_from_videomode(&vm, bus_flags);
1245 ret = of_property_read_u32(np, "width-mm", &width_mm);
1249 ret = of_property_read_u32(np, "height-mm", &height_mm);
1253 dmode->width_mm = width_mm;
1254 dmode->height_mm = height_mm;
1256 pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode));
1260 EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1261 #endif /* CONFIG_OF */
1262 #endif /* CONFIG_VIDEOMODE_HELPERS */
1265 * drm_mode_set_name - set the name on a mode
1266 * @mode: name will be set in this mode
1268 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1269 * with an optional 'i' suffix for interlaced modes.
1271 void drm_mode_set_name(struct drm_display_mode *mode)
1273 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1275 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
1276 mode->hdisplay, mode->vdisplay,
1277 interlaced ? "i" : "");
1279 EXPORT_SYMBOL(drm_mode_set_name);
1282 * drm_mode_vrefresh - get the vrefresh of a mode
1286 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
1287 * value first if it is not yet set.
1289 int drm_mode_vrefresh(const struct drm_display_mode *mode)
1291 unsigned int num, den;
1293 if (mode->htotal == 0 || mode->vtotal == 0)
1297 den = mode->htotal * mode->vtotal;
1299 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1301 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1303 if (mode->vscan > 1)
1306 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1308 EXPORT_SYMBOL(drm_mode_vrefresh);
1311 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1312 * @mode: mode to query
1313 * @hdisplay: hdisplay value to fill in
1314 * @vdisplay: vdisplay value to fill in
1316 * The vdisplay value will be doubled if the specified mode is a stereo mode of
1317 * the appropriate layout.
1319 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1320 int *hdisplay, int *vdisplay)
1322 struct drm_display_mode adjusted;
1324 drm_mode_init(&adjusted, mode);
1326 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
1327 *hdisplay = adjusted.crtc_hdisplay;
1328 *vdisplay = adjusted.crtc_vdisplay;
1330 EXPORT_SYMBOL(drm_mode_get_hv_timing);
1333 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1335 * @adjust_flags: a combination of adjustment flags
1337 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1339 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1341 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1342 * buffers containing two eyes (only adjust the timings when needed, eg. for
1343 * "frame packing" or "side by side full").
1344 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1345 * be performed for doublescan and vscan > 1 modes respectively.
1347 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1352 p->crtc_clock = p->clock;
1353 p->crtc_hdisplay = p->hdisplay;
1354 p->crtc_hsync_start = p->hsync_start;
1355 p->crtc_hsync_end = p->hsync_end;
1356 p->crtc_htotal = p->htotal;
1357 p->crtc_hskew = p->hskew;
1358 p->crtc_vdisplay = p->vdisplay;
1359 p->crtc_vsync_start = p->vsync_start;
1360 p->crtc_vsync_end = p->vsync_end;
1361 p->crtc_vtotal = p->vtotal;
1363 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1364 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1365 p->crtc_vdisplay /= 2;
1366 p->crtc_vsync_start /= 2;
1367 p->crtc_vsync_end /= 2;
1368 p->crtc_vtotal /= 2;
1372 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1373 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1374 p->crtc_vdisplay *= 2;
1375 p->crtc_vsync_start *= 2;
1376 p->crtc_vsync_end *= 2;
1377 p->crtc_vtotal *= 2;
1381 if (!(adjust_flags & CRTC_NO_VSCAN)) {
1383 p->crtc_vdisplay *= p->vscan;
1384 p->crtc_vsync_start *= p->vscan;
1385 p->crtc_vsync_end *= p->vscan;
1386 p->crtc_vtotal *= p->vscan;
1390 if (adjust_flags & CRTC_STEREO_DOUBLE) {
1391 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1394 case DRM_MODE_FLAG_3D_FRAME_PACKING:
1396 p->crtc_vdisplay += p->crtc_vtotal;
1397 p->crtc_vsync_start += p->crtc_vtotal;
1398 p->crtc_vsync_end += p->crtc_vtotal;
1399 p->crtc_vtotal += p->crtc_vtotal;
1404 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1405 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1406 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1407 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1409 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1412 * drm_mode_copy - copy the mode
1413 * @dst: mode to overwrite
1414 * @src: mode to copy
1416 * Copy an existing mode into another mode, preserving the
1417 * list head of the destination mode.
1419 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1421 struct list_head head = dst->head;
1426 EXPORT_SYMBOL(drm_mode_copy);
1429 * drm_mode_init - initialize the mode from another mode
1430 * @dst: mode to overwrite
1431 * @src: mode to copy
1433 * Copy an existing mode into another mode, zeroing the
1434 * list head of the destination mode. Typically used
1435 * to guarantee the list head is not left with stack
1436 * garbage in on-stack modes.
1438 void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1440 memset(dst, 0, sizeof(*dst));
1441 drm_mode_copy(dst, src);
1443 EXPORT_SYMBOL(drm_mode_init);
1446 * drm_mode_duplicate - allocate and duplicate an existing mode
1447 * @dev: drm_device to allocate the duplicated mode for
1448 * @mode: mode to duplicate
1450 * Just allocate a new mode, copy the existing mode into it, and return
1451 * a pointer to it. Used to create new instances of established modes.
1454 * Pointer to duplicated mode on success, NULL on error.
1456 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1457 const struct drm_display_mode *mode)
1459 struct drm_display_mode *nmode;
1461 nmode = drm_mode_create(dev);
1465 drm_mode_copy(nmode, mode);
1469 EXPORT_SYMBOL(drm_mode_duplicate);
1471 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1472 const struct drm_display_mode *mode2)
1474 return mode1->hdisplay == mode2->hdisplay &&
1475 mode1->hsync_start == mode2->hsync_start &&
1476 mode1->hsync_end == mode2->hsync_end &&
1477 mode1->htotal == mode2->htotal &&
1478 mode1->hskew == mode2->hskew &&
1479 mode1->vdisplay == mode2->vdisplay &&
1480 mode1->vsync_start == mode2->vsync_start &&
1481 mode1->vsync_end == mode2->vsync_end &&
1482 mode1->vtotal == mode2->vtotal &&
1483 mode1->vscan == mode2->vscan;
1486 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1487 const struct drm_display_mode *mode2)
1490 * do clock check convert to PICOS
1491 * so fb modes get matched the same
1493 if (mode1->clock && mode2->clock)
1494 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1496 return mode1->clock == mode2->clock;
1499 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1500 const struct drm_display_mode *mode2)
1502 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1503 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1506 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1507 const struct drm_display_mode *mode2)
1509 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1510 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
1513 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1514 const struct drm_display_mode *mode2)
1516 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1520 * drm_mode_match - test modes for (partial) equality
1521 * @mode1: first mode
1522 * @mode2: second mode
1523 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1525 * Check to see if @mode1 and @mode2 are equivalent.
1528 * True if the modes are (partially) equal, false otherwise.
1530 bool drm_mode_match(const struct drm_display_mode *mode1,
1531 const struct drm_display_mode *mode2,
1532 unsigned int match_flags)
1534 if (!mode1 && !mode2)
1537 if (!mode1 || !mode2)
1540 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1541 !drm_mode_match_timings(mode1, mode2))
1544 if (match_flags & DRM_MODE_MATCH_CLOCK &&
1545 !drm_mode_match_clock(mode1, mode2))
1548 if (match_flags & DRM_MODE_MATCH_FLAGS &&
1549 !drm_mode_match_flags(mode1, mode2))
1552 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1553 !drm_mode_match_3d_flags(mode1, mode2))
1556 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1557 !drm_mode_match_aspect_ratio(mode1, mode2))
1562 EXPORT_SYMBOL(drm_mode_match);
1565 * drm_mode_equal - test modes for equality
1566 * @mode1: first mode
1567 * @mode2: second mode
1569 * Check to see if @mode1 and @mode2 are equivalent.
1572 * True if the modes are equal, false otherwise.
1574 bool drm_mode_equal(const struct drm_display_mode *mode1,
1575 const struct drm_display_mode *mode2)
1577 return drm_mode_match(mode1, mode2,
1578 DRM_MODE_MATCH_TIMINGS |
1579 DRM_MODE_MATCH_CLOCK |
1580 DRM_MODE_MATCH_FLAGS |
1581 DRM_MODE_MATCH_3D_FLAGS|
1582 DRM_MODE_MATCH_ASPECT_RATIO);
1584 EXPORT_SYMBOL(drm_mode_equal);
1587 * drm_mode_equal_no_clocks - test modes for equality
1588 * @mode1: first mode
1589 * @mode2: second mode
1591 * Check to see if @mode1 and @mode2 are equivalent, but
1592 * don't check the pixel clocks.
1595 * True if the modes are equal, false otherwise.
1597 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1598 const struct drm_display_mode *mode2)
1600 return drm_mode_match(mode1, mode2,
1601 DRM_MODE_MATCH_TIMINGS |
1602 DRM_MODE_MATCH_FLAGS |
1603 DRM_MODE_MATCH_3D_FLAGS);
1605 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1608 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1609 * @mode1: first mode
1610 * @mode2: second mode
1612 * Check to see if @mode1 and @mode2 are equivalent, but
1613 * don't check the pixel clocks nor the stereo layout.
1616 * True if the modes are equal, false otherwise.
1618 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1619 const struct drm_display_mode *mode2)
1621 return drm_mode_match(mode1, mode2,
1622 DRM_MODE_MATCH_TIMINGS |
1623 DRM_MODE_MATCH_FLAGS);
1625 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1627 static enum drm_mode_status
1628 drm_mode_validate_basic(const struct drm_display_mode *mode)
1630 if (mode->type & ~DRM_MODE_TYPE_ALL)
1633 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1636 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1639 if (mode->clock == 0)
1640 return MODE_CLOCK_LOW;
1642 if (mode->hdisplay == 0 ||
1643 mode->hsync_start < mode->hdisplay ||
1644 mode->hsync_end < mode->hsync_start ||
1645 mode->htotal < mode->hsync_end)
1646 return MODE_H_ILLEGAL;
1648 if (mode->vdisplay == 0 ||
1649 mode->vsync_start < mode->vdisplay ||
1650 mode->vsync_end < mode->vsync_start ||
1651 mode->vtotal < mode->vsync_end)
1652 return MODE_V_ILLEGAL;
1658 * drm_mode_validate_driver - make sure the mode is somewhat sane
1660 * @mode: mode to check
1662 * First do basic validation on the mode, and then allow the driver
1663 * to check for device/driver specific limitations via the optional
1664 * &drm_mode_config_helper_funcs.mode_valid hook.
1669 enum drm_mode_status
1670 drm_mode_validate_driver(struct drm_device *dev,
1671 const struct drm_display_mode *mode)
1673 enum drm_mode_status status;
1675 status = drm_mode_validate_basic(mode);
1676 if (status != MODE_OK)
1679 if (dev->mode_config.funcs->mode_valid)
1680 return dev->mode_config.funcs->mode_valid(dev, mode);
1684 EXPORT_SYMBOL(drm_mode_validate_driver);
1687 * drm_mode_validate_size - make sure modes adhere to size constraints
1688 * @mode: mode to check
1689 * @maxX: maximum width
1690 * @maxY: maximum height
1692 * This function is a helper which can be used to validate modes against size
1693 * limitations of the DRM device/connector. If a mode is too big its status
1694 * member is updated with the appropriate validation failure code. The list
1695 * itself is not changed.
1700 enum drm_mode_status
1701 drm_mode_validate_size(const struct drm_display_mode *mode,
1704 if (maxX > 0 && mode->hdisplay > maxX)
1705 return MODE_VIRTUAL_X;
1707 if (maxY > 0 && mode->vdisplay > maxY)
1708 return MODE_VIRTUAL_Y;
1712 EXPORT_SYMBOL(drm_mode_validate_size);
1715 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1716 * @mode: mode to check
1717 * @connector: drm connector under action
1719 * This function is a helper which can be used to filter out any YCBCR420
1720 * only mode, when the source doesn't support it.
1725 enum drm_mode_status
1726 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1727 struct drm_connector *connector)
1729 if (!connector->ycbcr_420_allowed &&
1730 drm_mode_is_420_only(&connector->display_info, mode))
1735 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1737 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1739 static const char * const drm_mode_status_names[] = {
1743 MODE_STATUS(H_ILLEGAL),
1744 MODE_STATUS(V_ILLEGAL),
1745 MODE_STATUS(BAD_WIDTH),
1746 MODE_STATUS(NOMODE),
1747 MODE_STATUS(NO_INTERLACE),
1748 MODE_STATUS(NO_DBLESCAN),
1749 MODE_STATUS(NO_VSCAN),
1751 MODE_STATUS(VIRTUAL_X),
1752 MODE_STATUS(VIRTUAL_Y),
1753 MODE_STATUS(MEM_VIRT),
1754 MODE_STATUS(NOCLOCK),
1755 MODE_STATUS(CLOCK_HIGH),
1756 MODE_STATUS(CLOCK_LOW),
1757 MODE_STATUS(CLOCK_RANGE),
1758 MODE_STATUS(BAD_HVALUE),
1759 MODE_STATUS(BAD_VVALUE),
1760 MODE_STATUS(BAD_VSCAN),
1761 MODE_STATUS(HSYNC_NARROW),
1762 MODE_STATUS(HSYNC_WIDE),
1763 MODE_STATUS(HBLANK_NARROW),
1764 MODE_STATUS(HBLANK_WIDE),
1765 MODE_STATUS(VSYNC_NARROW),
1766 MODE_STATUS(VSYNC_WIDE),
1767 MODE_STATUS(VBLANK_NARROW),
1768 MODE_STATUS(VBLANK_WIDE),
1770 MODE_STATUS(INTERLACE_WIDTH),
1771 MODE_STATUS(ONE_WIDTH),
1772 MODE_STATUS(ONE_HEIGHT),
1773 MODE_STATUS(ONE_SIZE),
1774 MODE_STATUS(NO_REDUCED),
1775 MODE_STATUS(NO_STEREO),
1776 MODE_STATUS(NO_420),
1784 const char *drm_get_mode_status_name(enum drm_mode_status status)
1786 int index = status + 3;
1788 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1791 return drm_mode_status_names[index];
1795 * drm_mode_prune_invalid - remove invalid modes from mode list
1797 * @mode_list: list of modes to check
1798 * @verbose: be verbose about it
1800 * This helper function can be used to prune a display mode list after
1801 * validation has been completed. All modes whose status is not MODE_OK will be
1802 * removed from the list, and if @verbose the status code and mode name is also
1805 void drm_mode_prune_invalid(struct drm_device *dev,
1806 struct list_head *mode_list, bool verbose)
1808 struct drm_display_mode *mode, *t;
1810 list_for_each_entry_safe(mode, t, mode_list, head) {
1811 if (mode->status != MODE_OK) {
1812 list_del(&mode->head);
1813 if (mode->type & DRM_MODE_TYPE_USERDEF) {
1814 drm_warn(dev, "User-defined mode not supported: "
1815 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1818 drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n",
1819 DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status));
1821 drm_mode_destroy(dev, mode);
1825 EXPORT_SYMBOL(drm_mode_prune_invalid);
1828 * drm_mode_compare - compare modes for favorability
1830 * @lh_a: list_head for first mode
1831 * @lh_b: list_head for second mode
1833 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1837 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1838 * positive if @lh_b is better than @lh_a.
1840 static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1841 const struct list_head *lh_b)
1843 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1844 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1847 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1848 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1851 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1855 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1859 diff = b->clock - a->clock;
1864 * drm_mode_sort - sort mode list
1865 * @mode_list: list of drm_display_mode structures to sort
1867 * Sort @mode_list by favorability, moving good modes to the head of the list.
1869 void drm_mode_sort(struct list_head *mode_list)
1871 list_sort(NULL, mode_list, drm_mode_compare);
1873 EXPORT_SYMBOL(drm_mode_sort);
1876 * drm_connector_list_update - update the mode list for the connector
1877 * @connector: the connector to update
1879 * This moves the modes from the @connector probed_modes list
1880 * to the actual mode list. It compares the probed mode against the current
1881 * list and only adds different/new modes.
1883 * This is just a helper functions doesn't validate any modes itself and also
1884 * doesn't prune any invalid modes. Callers need to do that themselves.
1886 void drm_connector_list_update(struct drm_connector *connector)
1888 struct drm_display_mode *pmode, *pt;
1890 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1892 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1893 struct drm_display_mode *mode;
1894 bool found_it = false;
1896 /* go through current modes checking for the new probed mode */
1897 list_for_each_entry(mode, &connector->modes, head) {
1898 if (!drm_mode_equal(pmode, mode))
1904 * If the old matching mode is stale (ie. left over
1905 * from a previous probe) just replace it outright.
1906 * Otherwise just merge the type bits between all
1907 * equal probed modes.
1909 * If two probed modes are considered equal, pick the
1910 * actual timings from the one that's marked as
1911 * preferred (in case the match isn't 100%). If
1912 * multiple or zero preferred modes are present, favor
1913 * the mode added to the probed_modes list first.
1915 if (mode->status == MODE_STALE) {
1916 drm_mode_copy(mode, pmode);
1917 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1918 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1919 pmode->type |= mode->type;
1920 drm_mode_copy(mode, pmode);
1922 mode->type |= pmode->type;
1925 list_del(&pmode->head);
1926 drm_mode_destroy(connector->dev, pmode);
1931 list_move_tail(&pmode->head, &connector->modes);
1935 EXPORT_SYMBOL(drm_connector_list_update);
1937 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1938 struct drm_cmdline_mode *mode)
1946 bpp = simple_strtol(str, end_ptr, 10);
1947 if (*end_ptr == str)
1951 mode->bpp_specified = true;
1956 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1957 struct drm_cmdline_mode *mode)
1959 unsigned int refresh;
1965 refresh = simple_strtol(str, end_ptr, 10);
1966 if (*end_ptr == str)
1969 mode->refresh = refresh;
1970 mode->refresh_specified = true;
1975 static int drm_mode_parse_cmdline_extra(const char *str, int length,
1977 const struct drm_connector *connector,
1978 struct drm_cmdline_mode *mode)
1982 for (i = 0; i < length; i++) {
1988 mode->interlace = true;
1994 mode->margins = true;
1997 if (mode->force != DRM_FORCE_UNSPECIFIED)
2000 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2001 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2002 mode->force = DRM_FORCE_ON;
2004 mode->force = DRM_FORCE_ON_DIGITAL;
2007 if (mode->force != DRM_FORCE_UNSPECIFIED)
2010 mode->force = DRM_FORCE_OFF;
2013 if (mode->force != DRM_FORCE_UNSPECIFIED)
2016 mode->force = DRM_FORCE_ON;
2026 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2028 const struct drm_connector *connector,
2029 struct drm_cmdline_mode *mode)
2031 const char *str_start = str;
2032 bool rb = false, cvt = false;
2033 int xres = 0, yres = 0;
2037 xres = simple_strtol(str, &end_ptr, 10);
2041 if (end_ptr[0] != 'x')
2046 yres = simple_strtol(str, &end_ptr, 10);
2050 remaining = length - (end_ptr - str_start);
2054 for (i = 0; i < remaining; i++) {
2055 switch (end_ptr[i]) {
2064 * Try to pass that to our extras parsing
2065 * function to handle the case where the
2066 * extras are directly after the resolution
2069 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
2090 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2096 * delim must point to the '=', otherwise it is a syntax error and
2097 * if delim points to the terminating zero, then delim + 1 will point
2098 * past the end of the string.
2104 *int_ret = simple_strtol(value, &endp, 10);
2106 /* Make sure we have parsed something */
2113 static int drm_mode_parse_panel_orientation(const char *delim,
2114 struct drm_cmdline_mode *mode)
2122 delim = strchr(value, ',');
2124 delim = value + strlen(value);
2126 if (!strncmp(value, "normal", delim - value))
2127 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2128 else if (!strncmp(value, "upside_down", delim - value))
2129 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2130 else if (!strncmp(value, "left_side_up", delim - value))
2131 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2132 else if (!strncmp(value, "right_side_up", delim - value))
2133 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2140 static int drm_mode_parse_tv_mode(const char *delim,
2141 struct drm_cmdline_mode *mode)
2150 delim = strchr(value, ',');
2152 delim = value + strlen(value);
2154 ret = drm_get_tv_mode_from_name(value, delim - value);
2158 mode->tv_mode_specified = true;
2159 mode->tv_mode = ret;
2164 static int drm_mode_parse_cmdline_options(const char *str,
2166 const struct drm_connector *connector,
2167 struct drm_cmdline_mode *mode)
2169 unsigned int deg, margin, rotation = 0;
2170 const char *delim, *option, *sep;
2174 delim = strchr(option, '=');
2176 delim = strchr(option, ',');
2179 delim = option + strlen(option);
2182 if (!strncmp(option, "rotate", delim - option)) {
2183 if (drm_mode_parse_cmdline_int(delim, °))
2188 rotation |= DRM_MODE_ROTATE_0;
2192 rotation |= DRM_MODE_ROTATE_90;
2196 rotation |= DRM_MODE_ROTATE_180;
2200 rotation |= DRM_MODE_ROTATE_270;
2206 } else if (!strncmp(option, "reflect_x", delim - option)) {
2207 rotation |= DRM_MODE_REFLECT_X;
2208 } else if (!strncmp(option, "reflect_y", delim - option)) {
2209 rotation |= DRM_MODE_REFLECT_Y;
2210 } else if (!strncmp(option, "margin_right", delim - option)) {
2211 if (drm_mode_parse_cmdline_int(delim, &margin))
2214 mode->tv_margins.right = margin;
2215 } else if (!strncmp(option, "margin_left", delim - option)) {
2216 if (drm_mode_parse_cmdline_int(delim, &margin))
2219 mode->tv_margins.left = margin;
2220 } else if (!strncmp(option, "margin_top", delim - option)) {
2221 if (drm_mode_parse_cmdline_int(delim, &margin))
2224 mode->tv_margins.top = margin;
2225 } else if (!strncmp(option, "margin_bottom", delim - option)) {
2226 if (drm_mode_parse_cmdline_int(delim, &margin))
2229 mode->tv_margins.bottom = margin;
2230 } else if (!strncmp(option, "panel_orientation", delim - option)) {
2231 if (drm_mode_parse_panel_orientation(delim, mode))
2233 } else if (!strncmp(option, "tv_mode", delim - option)) {
2234 if (drm_mode_parse_tv_mode(delim, mode))
2239 sep = strchr(delim, ',');
2243 if (rotation && freestanding)
2246 if (!(rotation & DRM_MODE_ROTATE_MASK))
2247 rotation |= DRM_MODE_ROTATE_0;
2249 /* Make sure there is exactly one rotation defined */
2250 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
2253 mode->rotation_reflection = rotation;
2258 struct drm_named_mode {
2260 unsigned int pixel_clock_khz;
2264 unsigned int tv_mode;
2267 #define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \
2270 .pixel_clock_khz = _pclk, \
2277 static const struct drm_named_mode drm_named_modes[] = {
2278 NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2279 NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2280 NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2281 NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2284 static int drm_mode_parse_cmdline_named_mode(const char *name,
2285 unsigned int name_end,
2286 struct drm_cmdline_mode *cmdline_mode)
2293 /* If the name starts with a digit, it's not a named mode */
2294 if (isdigit(name[0]))
2298 * If there's an equal sign in the name, the command-line
2299 * contains only an option and no mode.
2301 if (strnchr(name, name_end, '='))
2304 /* The connection status extras can be set without a mode. */
2305 if (name_end == 1 &&
2306 (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2310 * We're sure we're a named mode at this point, iterate over the
2311 * list of modes we're aware of.
2313 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2314 const struct drm_named_mode *mode = &drm_named_modes[i];
2317 ret = str_has_prefix(name, mode->name);
2318 if (ret != name_end)
2321 strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2322 cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2323 cmdline_mode->xres = mode->xres;
2324 cmdline_mode->yres = mode->yres;
2325 cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2326 cmdline_mode->tv_mode = mode->tv_mode;
2327 cmdline_mode->tv_mode_specified = true;
2328 cmdline_mode->specified = true;
2337 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2338 * @mode_option: optional per connector mode option
2339 * @connector: connector to parse modeline for
2340 * @mode: preallocated drm_cmdline_mode structure to fill out
2342 * This parses @mode_option command line modeline for modes and options to
2343 * configure the connector.
2345 * This uses the same parameters as the fb modedb.c, except for an extra
2346 * force-enable, force-enable-digital and force-disable bit at the end::
2348 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2350 * Additionals options can be provided following the mode, using a comma to
2351 * separate each option. Valid options can be found in
2352 * Documentation/fb/modedb.rst.
2354 * The intermediate drm_cmdline_mode structure is required to store additional
2355 * options from the command line modline like the force-enable/disable flag.
2358 * True if a valid modeline has been parsed, false otherwise.
2360 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2361 const struct drm_connector *connector,
2362 struct drm_cmdline_mode *mode)
2365 bool freestanding = false, parse_extras = false;
2366 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2367 unsigned int mode_end = 0;
2368 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2369 const char *options_ptr = NULL;
2370 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2373 memset(mode, 0, sizeof(*mode));
2374 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2381 /* Locate the start of named options */
2382 options_ptr = strchr(name, ',');
2384 options_off = options_ptr - name;
2386 options_off = strlen(name);
2388 /* Try to locate the bpp and refresh specifiers, if any */
2389 bpp_ptr = strnchr(name, options_off, '-');
2390 while (bpp_ptr && !isdigit(bpp_ptr[1]))
2391 bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2393 bpp_off = bpp_ptr - name;
2395 refresh_ptr = strnchr(name, options_off, '@');
2397 refresh_off = refresh_ptr - name;
2399 /* Locate the end of the name / resolution, and parse it */
2402 } else if (refresh_ptr) {
2403 mode_end = refresh_off;
2404 } else if (options_ptr) {
2405 mode_end = options_off;
2406 parse_extras = true;
2408 mode_end = strlen(name);
2409 parse_extras = true;
2415 ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
2420 * Having a mode that starts by a letter (and thus is named) and
2421 * an at-sign (used to specify a refresh rate) is disallowed.
2423 if (ret && refresh_ptr)
2426 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2427 if (!mode->specified && isdigit(name[0])) {
2428 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
2435 mode->specified = true;
2438 /* No mode? Check for freestanding extras and/or options */
2439 if (!mode->specified) {
2440 unsigned int len = strlen(mode_option);
2442 if (bpp_ptr || refresh_ptr)
2443 return false; /* syntax error */
2445 if (len == 1 || (len >= 2 && mode_option[1] == ','))
2446 extra_ptr = mode_option;
2448 options_ptr = mode_option - 1;
2450 freestanding = true;
2454 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
2458 mode->bpp_specified = true;
2462 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
2463 &refresh_end_ptr, mode);
2467 mode->refresh_specified = true;
2471 * Locate the end of the bpp / refresh, and parse the extras
2474 if (bpp_ptr && refresh_ptr)
2475 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2477 extra_ptr = bpp_end_ptr;
2478 else if (refresh_ptr)
2479 extra_ptr = refresh_end_ptr;
2483 len = options_ptr - extra_ptr;
2485 len = strlen(extra_ptr);
2487 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
2494 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
2503 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2505 static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2506 struct drm_cmdline_mode *cmd)
2510 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2511 const struct drm_named_mode *named_mode = &drm_named_modes[i];
2513 if (strcmp(cmd->name, named_mode->name))
2516 if (!cmd->tv_mode_specified)
2519 return drm_analog_tv_mode(dev,
2520 named_mode->tv_mode,
2521 named_mode->pixel_clock_khz * 1000,
2524 named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2531 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2532 * @dev: DRM device to create the new mode for
2533 * @cmd: input command line modeline
2536 * Pointer to converted mode on success, NULL on error.
2538 struct drm_display_mode *
2539 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2540 struct drm_cmdline_mode *cmd)
2542 struct drm_display_mode *mode;
2544 if (cmd->xres == 0 || cmd->yres == 0)
2547 if (strlen(cmd->name))
2548 mode = drm_named_mode(dev, cmd);
2550 mode = drm_cvt_mode(dev,
2551 cmd->xres, cmd->yres,
2552 cmd->refresh_specified ? cmd->refresh : 60,
2553 cmd->rb, cmd->interlace,
2556 mode = drm_gtf_mode(dev,
2557 cmd->xres, cmd->yres,
2558 cmd->refresh_specified ? cmd->refresh : 60,
2564 mode->type |= DRM_MODE_TYPE_USERDEF;
2565 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2566 if (cmd->xres == 1366)
2567 drm_mode_fixup_1366x768(mode);
2568 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2571 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2574 * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2575 * @out: drm_mode_modeinfo struct to return to the user
2576 * @in: drm_display_mode to use
2578 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2581 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2582 const struct drm_display_mode *in)
2584 out->clock = in->clock;
2585 out->hdisplay = in->hdisplay;
2586 out->hsync_start = in->hsync_start;
2587 out->hsync_end = in->hsync_end;
2588 out->htotal = in->htotal;
2589 out->hskew = in->hskew;
2590 out->vdisplay = in->vdisplay;
2591 out->vsync_start = in->vsync_start;
2592 out->vsync_end = in->vsync_end;
2593 out->vtotal = in->vtotal;
2594 out->vscan = in->vscan;
2595 out->vrefresh = drm_mode_vrefresh(in);
2596 out->flags = in->flags;
2597 out->type = in->type;
2599 switch (in->picture_aspect_ratio) {
2600 case HDMI_PICTURE_ASPECT_4_3:
2601 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2603 case HDMI_PICTURE_ASPECT_16_9:
2604 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2606 case HDMI_PICTURE_ASPECT_64_27:
2607 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2609 case HDMI_PICTURE_ASPECT_256_135:
2610 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2613 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2614 in->picture_aspect_ratio);
2616 case HDMI_PICTURE_ASPECT_NONE:
2617 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2621 strscpy_pad(out->name, in->name, sizeof(out->name));
2625 * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2627 * @out: drm_display_mode to return to the user
2628 * @in: drm_mode_modeinfo to use
2630 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2634 * Zero on success, negative errno on failure.
2636 int drm_mode_convert_umode(struct drm_device *dev,
2637 struct drm_display_mode *out,
2638 const struct drm_mode_modeinfo *in)
2640 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2643 out->clock = in->clock;
2644 out->hdisplay = in->hdisplay;
2645 out->hsync_start = in->hsync_start;
2646 out->hsync_end = in->hsync_end;
2647 out->htotal = in->htotal;
2648 out->hskew = in->hskew;
2649 out->vdisplay = in->vdisplay;
2650 out->vsync_start = in->vsync_start;
2651 out->vsync_end = in->vsync_end;
2652 out->vtotal = in->vtotal;
2653 out->vscan = in->vscan;
2654 out->flags = in->flags;
2656 * Old xf86-video-vmware (possibly others too) used to
2657 * leave 'type' uninitialized. Just ignore any bits we
2658 * don't like. It's a just hint after all, and more
2659 * useful for the kernel->userspace direction anyway.
2661 out->type = in->type & DRM_MODE_TYPE_ALL;
2662 strscpy_pad(out->name, in->name, sizeof(out->name));
2664 /* Clearing picture aspect ratio bits from out flags,
2665 * as the aspect-ratio information is not stored in
2666 * flags for kernel-mode, but in picture_aspect_ratio.
2668 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2670 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2671 case DRM_MODE_FLAG_PIC_AR_4_3:
2672 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2674 case DRM_MODE_FLAG_PIC_AR_16_9:
2675 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2677 case DRM_MODE_FLAG_PIC_AR_64_27:
2678 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2680 case DRM_MODE_FLAG_PIC_AR_256_135:
2681 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2683 case DRM_MODE_FLAG_PIC_AR_NONE:
2684 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2690 out->status = drm_mode_validate_driver(dev, out);
2691 if (out->status != MODE_OK)
2694 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2700 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2703 * @display: display under action
2704 * @mode: video mode to be tested.
2707 * true if the mode can be supported in YCBCR420 format
2710 bool drm_mode_is_420_only(const struct drm_display_info *display,
2711 const struct drm_display_mode *mode)
2713 u8 vic = drm_match_cea_mode(mode);
2715 return test_bit(vic, display->hdmi.y420_vdb_modes);
2717 EXPORT_SYMBOL(drm_mode_is_420_only);
2720 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2721 * output format also (along with RGB/YCBCR444/422)
2723 * @display: display under action.
2724 * @mode: video mode to be tested.
2727 * true if the mode can be support YCBCR420 format
2730 bool drm_mode_is_420_also(const struct drm_display_info *display,
2731 const struct drm_display_mode *mode)
2733 u8 vic = drm_match_cea_mode(mode);
2735 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2737 EXPORT_SYMBOL(drm_mode_is_420_also);
2739 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2742 * @display: display under action.
2743 * @mode: video mode to be tested.
2746 * true if the mode can be supported in YCBCR420 format
2749 bool drm_mode_is_420(const struct drm_display_info *display,
2750 const struct drm_display_mode *mode)
2752 return drm_mode_is_420_only(display, mode) ||
2753 drm_mode_is_420_also(display, mode);
2755 EXPORT_SYMBOL(drm_mode_is_420);
2758 * drm_set_preferred_mode - Sets the preferred mode of a connector
2759 * @connector: connector whose mode list should be processed
2760 * @hpref: horizontal resolution of preferred mode
2761 * @vpref: vertical resolution of preferred mode
2763 * Marks a mode as preferred if it matches the resolution specified by @hpref
2766 void drm_set_preferred_mode(struct drm_connector *connector,
2767 int hpref, int vpref)
2769 struct drm_display_mode *mode;
2771 list_for_each_entry(mode, &connector->probed_modes, head) {
2772 if (mode->hdisplay == hpref &&
2773 mode->vdisplay == vpref)
2774 mode->type |= DRM_MODE_TYPE_PREFERRED;
2777 EXPORT_SYMBOL(drm_set_preferred_mode);