1/*
   2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
   3 * Copyright © 2007 Dave Airlie
   4 * Copyright © 2007-2008 Intel Corporation
   5 *   Jesse Barnes <jesse.barnes@intel.com>
   6 * Copyright 2005-2006 Luc Verhaegen
   7 * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
   8 *
   9 * Permission is hereby granted, free of charge, to any person obtaining a
  10 * copy of this software and associated documentation files (the "Software"),
  11 * to deal in the Software without restriction, including without limitation
  12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13 * and/or sell copies of the Software, and to permit persons to whom the
  14 * Software is furnished to do so, subject to the following conditions:
  15 *
  16 * The above copyright notice and this permission notice shall be included in
  17 * all copies or substantial portions of the Software.
  18 *
  19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25 * OTHER DEALINGS IN THE SOFTWARE.
  26 *
  27 * Except as contained in this notice, the name of the copyright holder(s)
  28 * and author(s) shall not be used in advertising or otherwise to promote
  29 * the sale, use or other dealings in this Software without prior written
  30 * authorization from the copyright holder(s) and author(s).
  31 */
  32
  33#include <linux/ctype.h>
  34#include <linux/list.h>
  35#include <linux/list_sort.h>
  36#include <linux/export.h>
 
  37
 
  38#include <video/of_videomode.h>
  39#include <video/videomode.h>
  40
  41#include <drm/drm_crtc.h>
  42#include <drm/drm_device.h>
 
  43#include <drm/drm_modes.h>
  44#include <drm/drm_print.h>
  45
  46#include "drm_crtc_internal.h"
  47
  48/**
  49 * drm_mode_debug_printmodeline - print a mode to dmesg
  50 * @mode: mode to print
  51 *
  52 * Describe @mode using DRM_DEBUG.
  53 */
  54void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  55{
  56	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
  57}
  58EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  59
  60/**
  61 * drm_mode_create - create a new display mode
  62 * @dev: DRM device
  63 *
  64 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
  65 * and return it.
  66 *
  67 * Returns:
  68 * Pointer to new mode on success, NULL on error.
  69 */
  70struct drm_display_mode *drm_mode_create(struct drm_device *dev)
  71{
  72	struct drm_display_mode *nmode;
  73
  74	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
  75	if (!nmode)
  76		return NULL;
  77
  78	return nmode;
  79}
  80EXPORT_SYMBOL(drm_mode_create);
  81
  82/**
  83 * drm_mode_destroy - remove a mode
  84 * @dev: DRM device
  85 * @mode: mode to remove
  86 *
  87 * Release @mode's unique ID, then free it @mode structure itself using kfree.
  88 */
  89void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
  90{
  91	if (!mode)
  92		return;
  93
  94	kfree(mode);
  95}
  96EXPORT_SYMBOL(drm_mode_destroy);
  97
  98/**
  99 * drm_mode_probed_add - add a mode to a connector's probed_mode list
 100 * @connector: connector the new mode
 101 * @mode: mode data
 102 *
 103 * Add @mode to @connector's probed_mode list for later use. This list should
 104 * then in a second step get filtered and all the modes actually supported by
 105 * the hardware moved to the @connector's modes list.
 106 */
 107void drm_mode_probed_add(struct drm_connector *connector,
 108			 struct drm_display_mode *mode)
 109{
 110	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
 111
 112	list_add_tail(&mode->head, &connector->probed_modes);
 113}
 114EXPORT_SYMBOL(drm_mode_probed_add);
 115
 116/**
 117 * drm_cvt_mode -create a modeline based on the CVT algorithm
 118 * @dev: drm device
 119 * @hdisplay: hdisplay size
 120 * @vdisplay: vdisplay size
 121 * @vrefresh: vrefresh rate
 122 * @reduced: whether to use reduced blanking
 123 * @interlaced: whether to compute an interlaced mode
 124 * @margins: whether to add margins (borders)
 125 *
 126 * This function is called to generate the modeline based on CVT algorithm
 127 * according to the hdisplay, vdisplay, vrefresh.
 128 * It is based from the VESA(TM) Coordinated Video Timing Generator by
 129 * Graham Loveridge April 9, 2003 available at
 130 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls 
 131 *
 132 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
 133 * What I have done is to translate it by using integer calculation.
 134 *
 135 * Returns:
 136 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
 137 * The display mode object is allocated with drm_mode_create(). Returns NULL
 138 * when no mode could be allocated.
 139 */
 140struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
 141				      int vdisplay, int vrefresh,
 142				      bool reduced, bool interlaced, bool margins)
 143{
 144#define HV_FACTOR			1000
 145	/* 1) top/bottom margin size (% of height) - default: 1.8, */
 146#define	CVT_MARGIN_PERCENTAGE		18
 147	/* 2) character cell horizontal granularity (pixels) - default 8 */
 148#define	CVT_H_GRANULARITY		8
 149	/* 3) Minimum vertical porch (lines) - default 3 */
 150#define	CVT_MIN_V_PORCH			3
 151	/* 4) Minimum number of vertical back porch lines - default 6 */
 152#define	CVT_MIN_V_BPORCH		6
 153	/* Pixel Clock step (kHz) */
 154#define CVT_CLOCK_STEP			250
 155	struct drm_display_mode *drm_mode;
 156	unsigned int vfieldrate, hperiod;
 157	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
 158	int interlace;
 159	u64 tmp;
 160
 161	if (!hdisplay || !vdisplay)
 162		return NULL;
 163
 164	/* allocate the drm_display_mode structure. If failure, we will
 165	 * return directly
 166	 */
 167	drm_mode = drm_mode_create(dev);
 168	if (!drm_mode)
 169		return NULL;
 170
 171	/* the CVT default refresh rate is 60Hz */
 172	if (!vrefresh)
 173		vrefresh = 60;
 174
 175	/* the required field fresh rate */
 176	if (interlaced)
 177		vfieldrate = vrefresh * 2;
 178	else
 179		vfieldrate = vrefresh;
 180
 181	/* horizontal pixels */
 182	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
 183
 184	/* determine the left&right borders */
 185	hmargin = 0;
 186	if (margins) {
 187		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 188		hmargin -= hmargin % CVT_H_GRANULARITY;
 189	}
 190	/* find the total active pixels */
 191	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
 192
 193	/* find the number of lines per field */
 194	if (interlaced)
 195		vdisplay_rnd = vdisplay / 2;
 196	else
 197		vdisplay_rnd = vdisplay;
 198
 199	/* find the top & bottom borders */
 200	vmargin = 0;
 201	if (margins)
 202		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 203
 204	drm_mode->vdisplay = vdisplay + 2 * vmargin;
 205
 206	/* Interlaced */
 207	if (interlaced)
 208		interlace = 1;
 209	else
 210		interlace = 0;
 211
 212	/* Determine VSync Width from aspect ratio */
 213	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
 214		vsync = 4;
 215	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
 216		vsync = 5;
 217	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
 218		vsync = 6;
 219	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
 220		vsync = 7;
 221	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
 222		vsync = 7;
 223	else /* custom */
 224		vsync = 10;
 225
 226	if (!reduced) {
 227		/* simplify the GTF calculation */
 228		/* 4) Minimum time of vertical sync + back porch interval (µs)
 229		 * default 550.0
 230		 */
 231		int tmp1, tmp2;
 232#define CVT_MIN_VSYNC_BP	550
 233		/* 3) Nominal HSync width (% of line period) - default 8 */
 234#define CVT_HSYNC_PERCENTAGE	8
 235		unsigned int hblank_percentage;
 236		int vsyncandback_porch, vback_porch, hblank;
 237
 238		/* estimated the horizontal period */
 239		tmp1 = HV_FACTOR * 1000000  -
 240				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
 241		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
 242				interlace;
 243		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
 244
 245		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
 246		/* 9. Find number of lines in sync + backporch */
 247		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
 248			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
 249		else
 250			vsyncandback_porch = tmp1;
 251		/* 10. Find number of lines in back porch */
 252		vback_porch = vsyncandback_porch - vsync;
 253		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
 254				vsyncandback_porch + CVT_MIN_V_PORCH;
 255		/* 5) Definition of Horizontal blanking time limitation */
 256		/* Gradient (%/kHz) - default 600 */
 257#define CVT_M_FACTOR	600
 258		/* Offset (%) - default 40 */
 259#define CVT_C_FACTOR	40
 260		/* Blanking time scaling factor - default 128 */
 261#define CVT_K_FACTOR	128
 262		/* Scaling factor weighting - default 20 */
 263#define CVT_J_FACTOR	20
 264#define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
 265#define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
 266			 CVT_J_FACTOR)
 267		/* 12. Find ideal blanking duty cycle from formula */
 268		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
 269					hperiod / 1000;
 270		/* 13. Blanking time */
 271		if (hblank_percentage < 20 * HV_FACTOR)
 272			hblank_percentage = 20 * HV_FACTOR;
 273		hblank = drm_mode->hdisplay * hblank_percentage /
 274			 (100 * HV_FACTOR - hblank_percentage);
 275		hblank -= hblank % (2 * CVT_H_GRANULARITY);
 276		/* 14. find the total pixels per line */
 277		drm_mode->htotal = drm_mode->hdisplay + hblank;
 278		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
 279		drm_mode->hsync_start = drm_mode->hsync_end -
 280			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
 281		drm_mode->hsync_start += CVT_H_GRANULARITY -
 282			drm_mode->hsync_start % CVT_H_GRANULARITY;
 283		/* fill the Vsync values */
 284		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
 285		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 286	} else {
 287		/* Reduced blanking */
 288		/* Minimum vertical blanking interval time (µs)- default 460 */
 289#define CVT_RB_MIN_VBLANK	460
 290		/* Fixed number of clocks for horizontal sync */
 291#define CVT_RB_H_SYNC		32
 292		/* Fixed number of clocks for horizontal blanking */
 293#define CVT_RB_H_BLANK		160
 294		/* Fixed number of lines for vertical front porch - default 3*/
 295#define CVT_RB_VFPORCH		3
 296		int vbilines;
 297		int tmp1, tmp2;
 298		/* 8. Estimate Horizontal period. */
 299		tmp1 = HV_FACTOR * 1000000 -
 300			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
 301		tmp2 = vdisplay_rnd + 2 * vmargin;
 302		hperiod = tmp1 / (tmp2 * vfieldrate);
 303		/* 9. Find number of lines in vertical blanking */
 304		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
 305		/* 10. Check if vertical blanking is sufficient */
 306		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
 307			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
 308		/* 11. Find total number of lines in vertical field */
 309		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
 310		/* 12. Find total number of pixels in a line */
 311		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
 312		/* Fill in HSync values */
 313		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
 314		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
 315		/* Fill in VSync values */
 316		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
 317		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 318	}
 319	/* 15/13. Find pixel clock frequency (kHz for xf86) */
 320	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
 321	tmp *= HV_FACTOR * 1000;
 322	do_div(tmp, hperiod);
 323	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
 324	drm_mode->clock = tmp;
 325	/* 18/16. Find actual vertical frame frequency */
 326	/* ignore - just set the mode flag for interlaced */
 327	if (interlaced) {
 328		drm_mode->vtotal *= 2;
 329		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 330	}
 331	/* Fill the mode line name */
 332	drm_mode_set_name(drm_mode);
 333	if (reduced)
 334		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
 335					DRM_MODE_FLAG_NVSYNC);
 336	else
 337		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
 338					DRM_MODE_FLAG_NHSYNC);
 339
 340	return drm_mode;
 341}
 342EXPORT_SYMBOL(drm_cvt_mode);
 343
 344/**
 345 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
 346 * @dev: drm device
 347 * @hdisplay: hdisplay size
 348 * @vdisplay: vdisplay size
 349 * @vrefresh: vrefresh rate.
 350 * @interlaced: whether to compute an interlaced mode
 351 * @margins: desired margin (borders) size
 352 * @GTF_M: extended GTF formula parameters
 353 * @GTF_2C: extended GTF formula parameters
 354 * @GTF_K: extended GTF formula parameters
 355 * @GTF_2J: extended GTF formula parameters
 356 *
 357 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
 358 * in here multiplied by two.  For a C of 40, pass in 80.
 359 *
 360 * Returns:
 361 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
 362 * The display mode object is allocated with drm_mode_create(). Returns NULL
 363 * when no mode could be allocated.
 364 */
 365struct drm_display_mode *
 366drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
 367		     int vrefresh, bool interlaced, int margins,
 368		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
 369{	/* 1) top/bottom margin size (% of height) - default: 1.8, */
 370#define	GTF_MARGIN_PERCENTAGE		18
 371	/* 2) character cell horizontal granularity (pixels) - default 8 */
 372#define	GTF_CELL_GRAN			8
 373	/* 3) Minimum vertical porch (lines) - default 3 */
 374#define	GTF_MIN_V_PORCH			1
 375	/* width of vsync in lines */
 376#define V_SYNC_RQD			3
 377	/* width of hsync as % of total line */
 378#define H_SYNC_PERCENT			8
 379	/* min time of vsync + back porch (microsec) */
 380#define MIN_VSYNC_PLUS_BP		550
 381	/* C' and M' are part of the Blanking Duty Cycle computation */
 382#define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
 383#define GTF_M_PRIME	(GTF_K * GTF_M / 256)
 384	struct drm_display_mode *drm_mode;
 385	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
 386	int top_margin, bottom_margin;
 387	int interlace;
 388	unsigned int hfreq_est;
 389	int vsync_plus_bp, vback_porch;
 390	unsigned int vtotal_lines, vfieldrate_est, hperiod;
 391	unsigned int vfield_rate, vframe_rate;
 
 392	int left_margin, right_margin;
 393	unsigned int total_active_pixels, ideal_duty_cycle;
 394	unsigned int hblank, total_pixels, pixel_freq;
 395	int hsync, hfront_porch, vodd_front_porch_lines;
 396	unsigned int tmp1, tmp2;
 397
 398	if (!hdisplay || !vdisplay)
 399		return NULL;
 400
 401	drm_mode = drm_mode_create(dev);
 402	if (!drm_mode)
 403		return NULL;
 404
 405	/* 1. In order to give correct results, the number of horizontal
 406	 * pixels requested is first processed to ensure that it is divisible
 407	 * by the character size, by rounding it to the nearest character
 408	 * cell boundary:
 409	 */
 410	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 411	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
 412
 413	/* 2. If interlace is requested, the number of vertical lines assumed
 414	 * by the calculation must be halved, as the computation calculates
 415	 * the number of vertical lines per field.
 416	 */
 417	if (interlaced)
 418		vdisplay_rnd = vdisplay / 2;
 419	else
 420		vdisplay_rnd = vdisplay;
 421
 422	/* 3. Find the frame rate required: */
 423	if (interlaced)
 424		vfieldrate_rqd = vrefresh * 2;
 425	else
 426		vfieldrate_rqd = vrefresh;
 427
 428	/* 4. Find number of lines in Top margin: */
 429	top_margin = 0;
 430	if (margins)
 431		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 432				1000;
 433	/* 5. Find number of lines in bottom margin: */
 434	bottom_margin = top_margin;
 435
 436	/* 6. If interlace is required, then set variable interlace: */
 437	if (interlaced)
 438		interlace = 1;
 439	else
 440		interlace = 0;
 441
 442	/* 7. Estimate the Horizontal frequency */
 443	{
 444		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
 445		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
 446				2 + interlace;
 447		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
 448	}
 449
 450	/* 8. Find the number of lines in V sync + back porch */
 451	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
 452	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
 453	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
 454	/*  9. Find the number of lines in V back porch alone: */
 455	vback_porch = vsync_plus_bp - V_SYNC_RQD;
 456	/*  10. Find the total number of lines in Vertical field period: */
 457	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
 458			vsync_plus_bp + GTF_MIN_V_PORCH;
 459	/*  11. Estimate the Vertical field frequency: */
 460	vfieldrate_est = hfreq_est / vtotal_lines;
 461	/*  12. Find the actual horizontal period: */
 462	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
 463
 464	/*  13. Find the actual Vertical field frequency: */
 465	vfield_rate = hfreq_est / vtotal_lines;
 466	/*  14. Find the Vertical frame frequency: */
 467	if (interlaced)
 468		vframe_rate = vfield_rate / 2;
 469	else
 470		vframe_rate = vfield_rate;
 471	/*  15. Find number of pixels in left margin: */
 472	if (margins)
 473		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 474				1000;
 475	else
 476		left_margin = 0;
 477
 478	/* 16.Find number of pixels in right margin: */
 479	right_margin = left_margin;
 480	/* 17.Find total number of active pixels in image and left and right */
 481	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
 482	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
 483	ideal_duty_cycle = GTF_C_PRIME * 1000 -
 484				(GTF_M_PRIME * 1000000 / hfreq_est);
 485	/* 19.Find the number of pixels in the blanking time to the nearest
 486	 * double character cell: */
 487	hblank = total_active_pixels * ideal_duty_cycle /
 488			(100000 - ideal_duty_cycle);
 489	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
 490	hblank = hblank * 2 * GTF_CELL_GRAN;
 491	/* 20.Find total number of pixels: */
 492	total_pixels = total_active_pixels + hblank;
 493	/* 21.Find pixel clock frequency: */
 494	pixel_freq = total_pixels * hfreq_est / 1000;
 495	/* Stage 1 computations are now complete; I should really pass
 496	 * the results to another function and do the Stage 2 computations,
 497	 * but I only need a few more values so I'll just append the
 498	 * computations here for now */
 499	/* 17. Find the number of pixels in the horizontal sync period: */
 500	hsync = H_SYNC_PERCENT * total_pixels / 100;
 501	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 502	hsync = hsync * GTF_CELL_GRAN;
 503	/* 18. Find the number of pixels in horizontal front porch period */
 504	hfront_porch = hblank / 2 - hsync;
 505	/*  36. Find the number of lines in the odd front porch period: */
 506	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
 507
 508	/* finally, pack the results in the mode struct */
 509	drm_mode->hdisplay = hdisplay_rnd;
 510	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
 511	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
 512	drm_mode->htotal = total_pixels;
 513	drm_mode->vdisplay = vdisplay_rnd;
 514	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
 515	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
 516	drm_mode->vtotal = vtotal_lines;
 517
 518	drm_mode->clock = pixel_freq;
 519
 520	if (interlaced) {
 521		drm_mode->vtotal *= 2;
 522		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 523	}
 524
 525	drm_mode_set_name(drm_mode);
 526	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
 527		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
 528	else
 529		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 530
 531	return drm_mode;
 532}
 533EXPORT_SYMBOL(drm_gtf_mode_complex);
 534
 535/**
 536 * drm_gtf_mode - create the modeline based on the GTF algorithm
 537 * @dev: drm device
 538 * @hdisplay: hdisplay size
 539 * @vdisplay: vdisplay size
 540 * @vrefresh: vrefresh rate.
 541 * @interlaced: whether to compute an interlaced mode
 542 * @margins: desired margin (borders) size
 543 *
 544 * return the modeline based on GTF algorithm
 545 *
 546 * This function is to create the modeline based on the GTF algorithm.
 547 * Generalized Timing Formula is derived from:
 548 *
 549 *	GTF Spreadsheet by Andy Morrish (1/5/97)
 550 *	available at http://www.vesa.org
 551 *
 552 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
 553 * What I have done is to translate it by using integer calculation.
 554 * I also refer to the function of fb_get_mode in the file of
 555 * drivers/video/fbmon.c
 556 *
 557 * Standard GTF parameters::
 558 *
 559 *     M = 600
 560 *     C = 40
 561 *     K = 128
 562 *     J = 20
 563 *
 564 * Returns:
 565 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
 566 * The display mode object is allocated with drm_mode_create(). Returns NULL
 567 * when no mode could be allocated.
 568 */
 569struct drm_display_mode *
 570drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
 571	     bool interlaced, int margins)
 572{
 573	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
 574				    interlaced, margins,
 575				    600, 40 * 2, 128, 20 * 2);
 576}
 577EXPORT_SYMBOL(drm_gtf_mode);
 578
 579#ifdef CONFIG_VIDEOMODE_HELPERS
 580/**
 581 * drm_display_mode_from_videomode - fill in @dmode using @vm,
 582 * @vm: videomode structure to use as source
 583 * @dmode: drm_display_mode structure to use as destination
 584 *
 585 * Fills out @dmode using the display mode specified in @vm.
 586 */
 587void drm_display_mode_from_videomode(const struct videomode *vm,
 588				     struct drm_display_mode *dmode)
 589{
 590	dmode->hdisplay = vm->hactive;
 591	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
 592	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
 593	dmode->htotal = dmode->hsync_end + vm->hback_porch;
 594
 595	dmode->vdisplay = vm->vactive;
 596	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
 597	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
 598	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
 599
 600	dmode->clock = vm->pixelclock / 1000;
 601
 602	dmode->flags = 0;
 603	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 604		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
 605	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
 606		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
 607	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 608		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
 609	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
 610		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
 611	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
 612		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
 613	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
 614		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
 615	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 616		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 617	drm_mode_set_name(dmode);
 618}
 619EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
 620
 621/**
 622 * drm_display_mode_to_videomode - fill in @vm using @dmode,
 623 * @dmode: drm_display_mode structure to use as source
 624 * @vm: videomode structure to use as destination
 625 *
 626 * Fills out @vm using the display mode specified in @dmode.
 627 */
 628void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 629				   struct videomode *vm)
 630{
 631	vm->hactive = dmode->hdisplay;
 632	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
 633	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
 634	vm->hback_porch = dmode->htotal - dmode->hsync_end;
 635
 636	vm->vactive = dmode->vdisplay;
 637	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
 638	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
 639	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
 640
 641	vm->pixelclock = dmode->clock * 1000;
 642
 643	vm->flags = 0;
 644	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
 645		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 646	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
 647		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 648	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
 649		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 650	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
 651		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 652	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
 653		vm->flags |= DISPLAY_FLAGS_INTERLACED;
 654	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
 655		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
 656	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
 657		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
 658}
 659EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
 660
 661/**
 662 * drm_bus_flags_from_videomode - extract information about pixelclk and
 663 * DE polarity from videomode and store it in a separate variable
 664 * @vm: videomode structure to use
 665 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
 666 * here
 667 *
 668 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
 669 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
 670 * found in @vm
 671 */
 672void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
 673{
 674	*bus_flags = 0;
 675	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
 676		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
 677	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
 678		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
 679
 680	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
 681		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
 682	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
 683		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
 684
 685	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
 686		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
 687	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
 688		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
 689}
 690EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
 691
 692#ifdef CONFIG_OF
 693/**
 694 * of_get_drm_display_mode - get a drm_display_mode from devicetree
 695 * @np: device_node with the timing specification
 696 * @dmode: will be set to the return value
 697 * @bus_flags: information about pixelclk, sync and DE polarity
 698 * @index: index into the list of display timings in devicetree
 699 *
 700 * This function is expensive and should only be used, if only one mode is to be
 701 * read from DT. To get multiple modes start with of_get_display_timings and
 702 * work with that instead.
 703 *
 704 * Returns:
 705 * 0 on success, a negative errno code when no of videomode node was found.
 706 */
 707int of_get_drm_display_mode(struct device_node *np,
 708			    struct drm_display_mode *dmode, u32 *bus_flags,
 709			    int index)
 710{
 711	struct videomode vm;
 712	int ret;
 713
 714	ret = of_get_videomode(np, &vm, index);
 715	if (ret)
 716		return ret;
 717
 718	drm_display_mode_from_videomode(&vm, dmode);
 719	if (bus_flags)
 720		drm_bus_flags_from_videomode(&vm, bus_flags);
 721
 722	pr_debug("%pOF: got %dx%d display mode\n",
 723		np, vm.hactive, vm.vactive);
 724	drm_mode_debug_printmodeline(dmode);
 725
 726	return 0;
 727}
 728EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 729#endif /* CONFIG_OF */
 730#endif /* CONFIG_VIDEOMODE_HELPERS */
 731
 732/**
 733 * drm_mode_set_name - set the name on a mode
 734 * @mode: name will be set in this mode
 735 *
 736 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
 737 * with an optional 'i' suffix for interlaced modes.
 738 */
 739void drm_mode_set_name(struct drm_display_mode *mode)
 740{
 741	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 742
 743	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
 744		 mode->hdisplay, mode->vdisplay,
 745		 interlaced ? "i" : "");
 746}
 747EXPORT_SYMBOL(drm_mode_set_name);
 748
 749/**
 750 * drm_mode_hsync - get the hsync of a mode
 751 * @mode: mode
 752 *
 753 * Returns:
 754 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
 755 * value first if it is not yet set.
 756 */
 757int drm_mode_hsync(const struct drm_display_mode *mode)
 758{
 759	unsigned int calc_val;
 760
 761	if (mode->hsync)
 762		return mode->hsync;
 763
 764	if (mode->htotal <= 0)
 765		return 0;
 766
 767	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
 768	calc_val += 500;				/* round to 1000Hz */
 769	calc_val /= 1000;				/* truncate to kHz */
 770
 771	return calc_val;
 772}
 773EXPORT_SYMBOL(drm_mode_hsync);
 774
 775/**
 776 * drm_mode_vrefresh - get the vrefresh of a mode
 777 * @mode: mode
 778 *
 779 * Returns:
 780 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
 781 * value first if it is not yet set.
 782 */
 783int drm_mode_vrefresh(const struct drm_display_mode *mode)
 784{
 785	int refresh = 0;
 786
 787	if (mode->vrefresh > 0)
 788		refresh = mode->vrefresh;
 789	else if (mode->htotal > 0 && mode->vtotal > 0) {
 790		unsigned int num, den;
 791
 792		num = mode->clock * 1000;
 793		den = mode->htotal * mode->vtotal;
 794
 795		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 796			num *= 2;
 797		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 798			den *= 2;
 799		if (mode->vscan > 1)
 800			den *= mode->vscan;
 801
 802		refresh = DIV_ROUND_CLOSEST(num, den);
 803	}
 804	return refresh;
 
 
 
 
 
 
 
 
 805}
 806EXPORT_SYMBOL(drm_mode_vrefresh);
 807
 808/**
 809 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
 810 * @mode: mode to query
 811 * @hdisplay: hdisplay value to fill in
 812 * @vdisplay: vdisplay value to fill in
 813 *
 814 * The vdisplay value will be doubled if the specified mode is a stereo mode of
 815 * the appropriate layout.
 816 */
 817void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
 818			    int *hdisplay, int *vdisplay)
 819{
 820	struct drm_display_mode adjusted = *mode;
 
 
 821
 822	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
 823	*hdisplay = adjusted.crtc_hdisplay;
 824	*vdisplay = adjusted.crtc_vdisplay;
 825}
 826EXPORT_SYMBOL(drm_mode_get_hv_timing);
 827
 828/**
 829 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
 830 * @p: mode
 831 * @adjust_flags: a combination of adjustment flags
 832 *
 833 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
 834 *
 835 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
 836 *   interlaced modes.
 837 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
 838 *   buffers containing two eyes (only adjust the timings when needed, eg. for
 839 *   "frame packing" or "side by side full").
 840 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
 841 *   be performed for doublescan and vscan > 1 modes respectively.
 842 */
 843void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
 844{
 845	if (!p)
 846		return;
 847
 848	p->crtc_clock = p->clock;
 849	p->crtc_hdisplay = p->hdisplay;
 850	p->crtc_hsync_start = p->hsync_start;
 851	p->crtc_hsync_end = p->hsync_end;
 852	p->crtc_htotal = p->htotal;
 853	p->crtc_hskew = p->hskew;
 854	p->crtc_vdisplay = p->vdisplay;
 855	p->crtc_vsync_start = p->vsync_start;
 856	p->crtc_vsync_end = p->vsync_end;
 857	p->crtc_vtotal = p->vtotal;
 858
 859	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
 860		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
 861			p->crtc_vdisplay /= 2;
 862			p->crtc_vsync_start /= 2;
 863			p->crtc_vsync_end /= 2;
 864			p->crtc_vtotal /= 2;
 865		}
 866	}
 867
 868	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
 869		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
 870			p->crtc_vdisplay *= 2;
 871			p->crtc_vsync_start *= 2;
 872			p->crtc_vsync_end *= 2;
 873			p->crtc_vtotal *= 2;
 874		}
 875	}
 876
 877	if (!(adjust_flags & CRTC_NO_VSCAN)) {
 878		if (p->vscan > 1) {
 879			p->crtc_vdisplay *= p->vscan;
 880			p->crtc_vsync_start *= p->vscan;
 881			p->crtc_vsync_end *= p->vscan;
 882			p->crtc_vtotal *= p->vscan;
 883		}
 884	}
 885
 886	if (adjust_flags & CRTC_STEREO_DOUBLE) {
 887		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
 888
 889		switch (layout) {
 890		case DRM_MODE_FLAG_3D_FRAME_PACKING:
 891			p->crtc_clock *= 2;
 892			p->crtc_vdisplay += p->crtc_vtotal;
 893			p->crtc_vsync_start += p->crtc_vtotal;
 894			p->crtc_vsync_end += p->crtc_vtotal;
 895			p->crtc_vtotal += p->crtc_vtotal;
 896			break;
 897		}
 898	}
 899
 900	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
 901	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 902	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
 903	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
 904}
 905EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 906
 907/**
 908 * drm_mode_copy - copy the mode
 909 * @dst: mode to overwrite
 910 * @src: mode to copy
 911 *
 912 * Copy an existing mode into another mode, preserving the object id and
 913 * list head of the destination mode.
 914 */
 915void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
 916{
 917	struct list_head head = dst->head;
 918
 919	*dst = *src;
 920	dst->head = head;
 921}
 922EXPORT_SYMBOL(drm_mode_copy);
 923
 924/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 925 * drm_mode_duplicate - allocate and duplicate an existing mode
 926 * @dev: drm_device to allocate the duplicated mode for
 927 * @mode: mode to duplicate
 928 *
 929 * Just allocate a new mode, copy the existing mode into it, and return
 930 * a pointer to it.  Used to create new instances of established modes.
 931 *
 932 * Returns:
 933 * Pointer to duplicated mode on success, NULL on error.
 934 */
 935struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
 936					    const struct drm_display_mode *mode)
 937{
 938	struct drm_display_mode *nmode;
 939
 940	nmode = drm_mode_create(dev);
 941	if (!nmode)
 942		return NULL;
 943
 944	drm_mode_copy(nmode, mode);
 945
 946	return nmode;
 947}
 948EXPORT_SYMBOL(drm_mode_duplicate);
 949
 950static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
 951				   const struct drm_display_mode *mode2)
 952{
 953	return mode1->hdisplay == mode2->hdisplay &&
 954		mode1->hsync_start == mode2->hsync_start &&
 955		mode1->hsync_end == mode2->hsync_end &&
 956		mode1->htotal == mode2->htotal &&
 957		mode1->hskew == mode2->hskew &&
 958		mode1->vdisplay == mode2->vdisplay &&
 959		mode1->vsync_start == mode2->vsync_start &&
 960		mode1->vsync_end == mode2->vsync_end &&
 961		mode1->vtotal == mode2->vtotal &&
 962		mode1->vscan == mode2->vscan;
 963}
 964
 965static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
 966				  const struct drm_display_mode *mode2)
 967{
 968	/*
 969	 * do clock check convert to PICOS
 970	 * so fb modes get matched the same
 971	 */
 972	if (mode1->clock && mode2->clock)
 973		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
 974	else
 975		return mode1->clock == mode2->clock;
 976}
 977
 978static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
 979				 const struct drm_display_mode *mode2)
 980{
 981	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
 982		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
 983}
 984
 985static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
 986				    const struct drm_display_mode *mode2)
 987{
 988	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
 989		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
 990}
 991
 992static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
 993					const struct drm_display_mode *mode2)
 994{
 995	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
 996}
 997
 998/**
 999 * drm_mode_match - test modes for (partial) equality
1000 * @mode1: first mode
1001 * @mode2: second mode
1002 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1003 *
1004 * Check to see if @mode1 and @mode2 are equivalent.
1005 *
1006 * Returns:
1007 * True if the modes are (partially) equal, false otherwise.
1008 */
1009bool drm_mode_match(const struct drm_display_mode *mode1,
1010		    const struct drm_display_mode *mode2,
1011		    unsigned int match_flags)
1012{
1013	if (!mode1 && !mode2)
1014		return true;
1015
1016	if (!mode1 || !mode2)
1017		return false;
1018
1019	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1020	    !drm_mode_match_timings(mode1, mode2))
1021		return false;
1022
1023	if (match_flags & DRM_MODE_MATCH_CLOCK &&
1024	    !drm_mode_match_clock(mode1, mode2))
1025		return false;
1026
1027	if (match_flags & DRM_MODE_MATCH_FLAGS &&
1028	    !drm_mode_match_flags(mode1, mode2))
1029		return false;
1030
1031	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1032	    !drm_mode_match_3d_flags(mode1, mode2))
1033		return false;
1034
1035	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1036	    !drm_mode_match_aspect_ratio(mode1, mode2))
1037		return false;
1038
1039	return true;
1040}
1041EXPORT_SYMBOL(drm_mode_match);
1042
1043/**
1044 * drm_mode_equal - test modes for equality
1045 * @mode1: first mode
1046 * @mode2: second mode
1047 *
1048 * Check to see if @mode1 and @mode2 are equivalent.
1049 *
1050 * Returns:
1051 * True if the modes are equal, false otherwise.
1052 */
1053bool drm_mode_equal(const struct drm_display_mode *mode1,
1054		    const struct drm_display_mode *mode2)
1055{
1056	return drm_mode_match(mode1, mode2,
1057			      DRM_MODE_MATCH_TIMINGS |
1058			      DRM_MODE_MATCH_CLOCK |
1059			      DRM_MODE_MATCH_FLAGS |
1060			      DRM_MODE_MATCH_3D_FLAGS|
1061			      DRM_MODE_MATCH_ASPECT_RATIO);
1062}
1063EXPORT_SYMBOL(drm_mode_equal);
1064
1065/**
1066 * drm_mode_equal_no_clocks - test modes for equality
1067 * @mode1: first mode
1068 * @mode2: second mode
1069 *
1070 * Check to see if @mode1 and @mode2 are equivalent, but
1071 * don't check the pixel clocks.
1072 *
1073 * Returns:
1074 * True if the modes are equal, false otherwise.
1075 */
1076bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1077			      const struct drm_display_mode *mode2)
1078{
1079	return drm_mode_match(mode1, mode2,
1080			      DRM_MODE_MATCH_TIMINGS |
1081			      DRM_MODE_MATCH_FLAGS |
1082			      DRM_MODE_MATCH_3D_FLAGS);
1083}
1084EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1085
1086/**
1087 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1088 * @mode1: first mode
1089 * @mode2: second mode
1090 *
1091 * Check to see if @mode1 and @mode2 are equivalent, but
1092 * don't check the pixel clocks nor the stereo layout.
1093 *
1094 * Returns:
1095 * True if the modes are equal, false otherwise.
1096 */
1097bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1098					const struct drm_display_mode *mode2)
1099{
1100	return drm_mode_match(mode1, mode2,
1101			      DRM_MODE_MATCH_TIMINGS |
1102			      DRM_MODE_MATCH_FLAGS);
1103}
1104EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1105
1106static enum drm_mode_status
1107drm_mode_validate_basic(const struct drm_display_mode *mode)
1108{
1109	if (mode->type & ~DRM_MODE_TYPE_ALL)
1110		return MODE_BAD;
1111
1112	if (mode->flags & ~DRM_MODE_FLAG_ALL)
1113		return MODE_BAD;
1114
1115	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1116		return MODE_BAD;
1117
1118	if (mode->clock == 0)
1119		return MODE_CLOCK_LOW;
1120
1121	if (mode->hdisplay == 0 ||
1122	    mode->hsync_start < mode->hdisplay ||
1123	    mode->hsync_end < mode->hsync_start ||
1124	    mode->htotal < mode->hsync_end)
1125		return MODE_H_ILLEGAL;
1126
1127	if (mode->vdisplay == 0 ||
1128	    mode->vsync_start < mode->vdisplay ||
1129	    mode->vsync_end < mode->vsync_start ||
1130	    mode->vtotal < mode->vsync_end)
1131		return MODE_V_ILLEGAL;
1132
1133	return MODE_OK;
1134}
1135
1136/**
1137 * drm_mode_validate_driver - make sure the mode is somewhat sane
1138 * @dev: drm device
1139 * @mode: mode to check
1140 *
1141 * First do basic validation on the mode, and then allow the driver
1142 * to check for device/driver specific limitations via the optional
1143 * &drm_mode_config_helper_funcs.mode_valid hook.
1144 *
1145 * Returns:
1146 * The mode status
1147 */
1148enum drm_mode_status
1149drm_mode_validate_driver(struct drm_device *dev,
1150			const struct drm_display_mode *mode)
1151{
1152	enum drm_mode_status status;
1153
1154	status = drm_mode_validate_basic(mode);
1155	if (status != MODE_OK)
1156		return status;
1157
1158	if (dev->mode_config.funcs->mode_valid)
1159		return dev->mode_config.funcs->mode_valid(dev, mode);
1160	else
1161		return MODE_OK;
1162}
1163EXPORT_SYMBOL(drm_mode_validate_driver);
1164
1165/**
1166 * drm_mode_validate_size - make sure modes adhere to size constraints
1167 * @mode: mode to check
1168 * @maxX: maximum width
1169 * @maxY: maximum height
1170 *
1171 * This function is a helper which can be used to validate modes against size
1172 * limitations of the DRM device/connector. If a mode is too big its status
1173 * member is updated with the appropriate validation failure code. The list
1174 * itself is not changed.
1175 *
1176 * Returns:
1177 * The mode status
1178 */
1179enum drm_mode_status
1180drm_mode_validate_size(const struct drm_display_mode *mode,
1181		       int maxX, int maxY)
1182{
1183	if (maxX > 0 && mode->hdisplay > maxX)
1184		return MODE_VIRTUAL_X;
1185
1186	if (maxY > 0 && mode->vdisplay > maxY)
1187		return MODE_VIRTUAL_Y;
1188
1189	return MODE_OK;
1190}
1191EXPORT_SYMBOL(drm_mode_validate_size);
1192
1193/**
1194 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1195 * @mode: mode to check
1196 * @connector: drm connector under action
1197 *
1198 * This function is a helper which can be used to filter out any YCBCR420
1199 * only mode, when the source doesn't support it.
1200 *
1201 * Returns:
1202 * The mode status
1203 */
1204enum drm_mode_status
1205drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1206			   struct drm_connector *connector)
1207{
1208	u8 vic = drm_match_cea_mode(mode);
1209	enum drm_mode_status status = MODE_OK;
1210	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1211
1212	if (test_bit(vic, hdmi->y420_vdb_modes)) {
1213		if (!connector->ycbcr_420_allowed)
1214			status = MODE_NO_420;
1215	}
1216
1217	return status;
1218}
1219EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1220
1221#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1222
1223static const char * const drm_mode_status_names[] = {
1224	MODE_STATUS(OK),
1225	MODE_STATUS(HSYNC),
1226	MODE_STATUS(VSYNC),
1227	MODE_STATUS(H_ILLEGAL),
1228	MODE_STATUS(V_ILLEGAL),
1229	MODE_STATUS(BAD_WIDTH),
1230	MODE_STATUS(NOMODE),
1231	MODE_STATUS(NO_INTERLACE),
1232	MODE_STATUS(NO_DBLESCAN),
1233	MODE_STATUS(NO_VSCAN),
1234	MODE_STATUS(MEM),
1235	MODE_STATUS(VIRTUAL_X),
1236	MODE_STATUS(VIRTUAL_Y),
1237	MODE_STATUS(MEM_VIRT),
1238	MODE_STATUS(NOCLOCK),
1239	MODE_STATUS(CLOCK_HIGH),
1240	MODE_STATUS(CLOCK_LOW),
1241	MODE_STATUS(CLOCK_RANGE),
1242	MODE_STATUS(BAD_HVALUE),
1243	MODE_STATUS(BAD_VVALUE),
1244	MODE_STATUS(BAD_VSCAN),
1245	MODE_STATUS(HSYNC_NARROW),
1246	MODE_STATUS(HSYNC_WIDE),
1247	MODE_STATUS(HBLANK_NARROW),
1248	MODE_STATUS(HBLANK_WIDE),
1249	MODE_STATUS(VSYNC_NARROW),
1250	MODE_STATUS(VSYNC_WIDE),
1251	MODE_STATUS(VBLANK_NARROW),
1252	MODE_STATUS(VBLANK_WIDE),
1253	MODE_STATUS(PANEL),
1254	MODE_STATUS(INTERLACE_WIDTH),
1255	MODE_STATUS(ONE_WIDTH),
1256	MODE_STATUS(ONE_HEIGHT),
1257	MODE_STATUS(ONE_SIZE),
1258	MODE_STATUS(NO_REDUCED),
1259	MODE_STATUS(NO_STEREO),
1260	MODE_STATUS(NO_420),
1261	MODE_STATUS(STALE),
1262	MODE_STATUS(BAD),
1263	MODE_STATUS(ERROR),
1264};
1265
1266#undef MODE_STATUS
1267
1268const char *drm_get_mode_status_name(enum drm_mode_status status)
1269{
1270	int index = status + 3;
1271
1272	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1273		return "";
1274
1275	return drm_mode_status_names[index];
1276}
1277
1278/**
1279 * drm_mode_prune_invalid - remove invalid modes from mode list
1280 * @dev: DRM device
1281 * @mode_list: list of modes to check
1282 * @verbose: be verbose about it
1283 *
1284 * This helper function can be used to prune a display mode list after
1285 * validation has been completed. All modes whose status is not MODE_OK will be
1286 * removed from the list, and if @verbose the status code and mode name is also
1287 * printed to dmesg.
1288 */
1289void drm_mode_prune_invalid(struct drm_device *dev,
1290			    struct list_head *mode_list, bool verbose)
1291{
1292	struct drm_display_mode *mode, *t;
1293
1294	list_for_each_entry_safe(mode, t, mode_list, head) {
1295		if (mode->status != MODE_OK) {
1296			list_del(&mode->head);
 
 
 
 
1297			if (verbose) {
1298				drm_mode_debug_printmodeline(mode);
1299				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1300					      mode->name,
1301					      drm_get_mode_status_name(mode->status));
1302			}
1303			drm_mode_destroy(dev, mode);
1304		}
1305	}
1306}
1307EXPORT_SYMBOL(drm_mode_prune_invalid);
1308
1309/**
1310 * drm_mode_compare - compare modes for favorability
1311 * @priv: unused
1312 * @lh_a: list_head for first mode
1313 * @lh_b: list_head for second mode
1314 *
1315 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1316 * which is better.
1317 *
1318 * Returns:
1319 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1320 * positive if @lh_b is better than @lh_a.
1321 */
1322static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
 
1323{
1324	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1325	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1326	int diff;
1327
1328	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1329		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1330	if (diff)
1331		return diff;
1332	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1333	if (diff)
1334		return diff;
1335
1336	diff = b->vrefresh - a->vrefresh;
1337	if (diff)
1338		return diff;
1339
1340	diff = b->clock - a->clock;
1341	return diff;
1342}
1343
1344/**
1345 * drm_mode_sort - sort mode list
1346 * @mode_list: list of drm_display_mode structures to sort
1347 *
1348 * Sort @mode_list by favorability, moving good modes to the head of the list.
1349 */
1350void drm_mode_sort(struct list_head *mode_list)
1351{
1352	list_sort(NULL, mode_list, drm_mode_compare);
1353}
1354EXPORT_SYMBOL(drm_mode_sort);
1355
1356/**
1357 * drm_connector_list_update - update the mode list for the connector
1358 * @connector: the connector to update
1359 *
1360 * This moves the modes from the @connector probed_modes list
1361 * to the actual mode list. It compares the probed mode against the current
1362 * list and only adds different/new modes.
1363 *
1364 * This is just a helper functions doesn't validate any modes itself and also
1365 * doesn't prune any invalid modes. Callers need to do that themselves.
1366 */
1367void drm_connector_list_update(struct drm_connector *connector)
1368{
1369	struct drm_display_mode *pmode, *pt;
1370
1371	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1372
1373	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1374		struct drm_display_mode *mode;
1375		bool found_it = false;
1376
1377		/* go through current modes checking for the new probed mode */
1378		list_for_each_entry(mode, &connector->modes, head) {
1379			if (!drm_mode_equal(pmode, mode))
1380				continue;
1381
1382			found_it = true;
1383
1384			/*
1385			 * If the old matching mode is stale (ie. left over
1386			 * from a previous probe) just replace it outright.
1387			 * Otherwise just merge the type bits between all
1388			 * equal probed modes.
1389			 *
1390			 * If two probed modes are considered equal, pick the
1391			 * actual timings from the one that's marked as
1392			 * preferred (in case the match isn't 100%). If
1393			 * multiple or zero preferred modes are present, favor
1394			 * the mode added to the probed_modes list first.
1395			 */
1396			if (mode->status == MODE_STALE) {
1397				drm_mode_copy(mode, pmode);
1398			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1399				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1400				pmode->type |= mode->type;
1401				drm_mode_copy(mode, pmode);
1402			} else {
1403				mode->type |= pmode->type;
1404			}
1405
1406			list_del(&pmode->head);
1407			drm_mode_destroy(connector->dev, pmode);
1408			break;
1409		}
1410
1411		if (!found_it) {
1412			list_move_tail(&pmode->head, &connector->modes);
1413		}
1414	}
1415}
1416EXPORT_SYMBOL(drm_connector_list_update);
1417
1418static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1419				      struct drm_cmdline_mode *mode)
1420{
1421	unsigned int bpp;
1422
1423	if (str[0] != '-')
1424		return -EINVAL;
1425
1426	str++;
1427	bpp = simple_strtol(str, end_ptr, 10);
1428	if (*end_ptr == str)
1429		return -EINVAL;
1430
1431	mode->bpp = bpp;
1432	mode->bpp_specified = true;
1433
1434	return 0;
1435}
1436
1437static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1438					  struct drm_cmdline_mode *mode)
1439{
1440	unsigned int refresh;
1441
1442	if (str[0] != '@')
1443		return -EINVAL;
1444
1445	str++;
1446	refresh = simple_strtol(str, end_ptr, 10);
1447	if (*end_ptr == str)
1448		return -EINVAL;
1449
1450	mode->refresh = refresh;
1451	mode->refresh_specified = true;
1452
1453	return 0;
1454}
1455
1456static int drm_mode_parse_cmdline_extra(const char *str, int length,
1457					bool freestanding,
1458					const struct drm_connector *connector,
1459					struct drm_cmdline_mode *mode)
1460{
1461	int i;
1462
1463	for (i = 0; i < length; i++) {
1464		switch (str[i]) {
1465		case 'i':
1466			if (freestanding)
1467				return -EINVAL;
1468
1469			mode->interlace = true;
1470			break;
1471		case 'm':
1472			if (freestanding)
1473				return -EINVAL;
1474
1475			mode->margins = true;
1476			break;
1477		case 'D':
1478			if (mode->force != DRM_FORCE_UNSPECIFIED)
1479				return -EINVAL;
1480
1481			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1482			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1483				mode->force = DRM_FORCE_ON;
1484			else
1485				mode->force = DRM_FORCE_ON_DIGITAL;
1486			break;
1487		case 'd':
1488			if (mode->force != DRM_FORCE_UNSPECIFIED)
1489				return -EINVAL;
1490
1491			mode->force = DRM_FORCE_OFF;
1492			break;
1493		case 'e':
1494			if (mode->force != DRM_FORCE_UNSPECIFIED)
1495				return -EINVAL;
1496
1497			mode->force = DRM_FORCE_ON;
1498			break;
1499		default:
1500			return -EINVAL;
1501		}
1502	}
1503
1504	return 0;
1505}
1506
1507static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1508					   bool extras,
1509					   const struct drm_connector *connector,
1510					   struct drm_cmdline_mode *mode)
1511{
1512	const char *str_start = str;
1513	bool rb = false, cvt = false;
1514	int xres = 0, yres = 0;
1515	int remaining, i;
1516	char *end_ptr;
1517
1518	xres = simple_strtol(str, &end_ptr, 10);
1519	if (end_ptr == str)
1520		return -EINVAL;
1521
1522	if (end_ptr[0] != 'x')
1523		return -EINVAL;
1524	end_ptr++;
1525
1526	str = end_ptr;
1527	yres = simple_strtol(str, &end_ptr, 10);
1528	if (end_ptr == str)
1529		return -EINVAL;
1530
1531	remaining = length - (end_ptr - str_start);
1532	if (remaining < 0)
1533		return -EINVAL;
1534
1535	for (i = 0; i < remaining; i++) {
1536		switch (end_ptr[i]) {
1537		case 'M':
1538			cvt = true;
1539			break;
1540		case 'R':
1541			rb = true;
1542			break;
1543		default:
1544			/*
1545			 * Try to pass that to our extras parsing
1546			 * function to handle the case where the
1547			 * extras are directly after the resolution
1548			 */
1549			if (extras) {
1550				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1551								       1,
1552								       false,
1553								       connector,
1554								       mode);
1555				if (ret)
1556					return ret;
1557			} else {
1558				return -EINVAL;
1559			}
1560		}
1561	}
1562
1563	mode->xres = xres;
1564	mode->yres = yres;
1565	mode->cvt = cvt;
1566	mode->rb = rb;
1567
1568	return 0;
1569}
1570
1571static int drm_mode_parse_cmdline_options(char *str, size_t len,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1572					  const struct drm_connector *connector,
1573					  struct drm_cmdline_mode *mode)
1574{
1575	unsigned int rotation = 0;
1576	char *sep = str;
1577
1578	while ((sep = strchr(sep, ','))) {
1579		char *delim, *option;
1580
1581		option = sep + 1;
 
1582		delim = strchr(option, '=');
1583		if (!delim) {
1584			delim = strchr(option, ',');
1585
1586			if (!delim)
1587				delim = str + len;
1588		}
1589
1590		if (!strncmp(option, "rotate", delim - option)) {
1591			const char *value = delim + 1;
1592			unsigned int deg;
1593
1594			deg = simple_strtol(value, &sep, 10);
1595
1596			/* Make sure we have parsed something */
1597			if (sep == value)
1598				return -EINVAL;
1599
1600			switch (deg) {
1601			case 0:
1602				rotation |= DRM_MODE_ROTATE_0;
1603				break;
1604
1605			case 90:
1606				rotation |= DRM_MODE_ROTATE_90;
1607				break;
1608
1609			case 180:
1610				rotation |= DRM_MODE_ROTATE_180;
1611				break;
1612
1613			case 270:
1614				rotation |= DRM_MODE_ROTATE_270;
1615				break;
1616
1617			default:
1618				return -EINVAL;
1619			}
1620		} else if (!strncmp(option, "reflect_x", delim - option)) {
1621			rotation |= DRM_MODE_REFLECT_X;
1622			sep = delim;
1623		} else if (!strncmp(option, "reflect_y", delim - option)) {
1624			rotation |= DRM_MODE_REFLECT_Y;
1625			sep = delim;
1626		} else if (!strncmp(option, "margin_right", delim - option)) {
1627			const char *value = delim + 1;
1628			unsigned int margin;
1629
1630			margin = simple_strtol(value, &sep, 10);
1631
1632			/* Make sure we have parsed something */
1633			if (sep == value)
1634				return -EINVAL;
1635
1636			mode->tv_margins.right = margin;
1637		} else if (!strncmp(option, "margin_left", delim - option)) {
1638			const char *value = delim + 1;
1639			unsigned int margin;
1640
1641			margin = simple_strtol(value, &sep, 10);
1642
1643			/* Make sure we have parsed something */
1644			if (sep == value)
1645				return -EINVAL;
1646
1647			mode->tv_margins.left = margin;
1648		} else if (!strncmp(option, "margin_top", delim - option)) {
1649			const char *value = delim + 1;
1650			unsigned int margin;
1651
1652			margin = simple_strtol(value, &sep, 10);
1653
1654			/* Make sure we have parsed something */
1655			if (sep == value)
1656				return -EINVAL;
1657
1658			mode->tv_margins.top = margin;
1659		} else if (!strncmp(option, "margin_bottom", delim - option)) {
1660			const char *value = delim + 1;
1661			unsigned int margin;
1662
1663			margin = simple_strtol(value, &sep, 10);
1664
1665			/* Make sure we have parsed something */
1666			if (sep == value)
1667				return -EINVAL;
1668
1669			mode->tv_margins.bottom = margin;
 
 
 
1670		} else {
1671			return -EINVAL;
1672		}
1673	}
 
 
 
 
 
 
 
 
 
 
 
 
1674
1675	mode->rotation_reflection = rotation;
1676
1677	return 0;
1678}
1679
1680static const char * const drm_named_modes_whitelist[] = {
1681	"NTSC",
1682	"PAL",
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1683};
1684
1685static bool drm_named_mode_is_in_whitelist(const char *mode, unsigned int size)
 
 
1686{
1687	int i;
1688
1689	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++)
1690		if (!strncmp(mode, drm_named_modes_whitelist[i], size))
1691			return true;
1692
1693	return false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1694}
1695
1696/**
1697 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1698 * @mode_option: optional per connector mode option
1699 * @connector: connector to parse modeline for
1700 * @mode: preallocated drm_cmdline_mode structure to fill out
1701 *
1702 * This parses @mode_option command line modeline for modes and options to
1703 * configure the connector. If @mode_option is NULL the default command line
1704 * modeline in fb_mode_option will be parsed instead.
1705 *
1706 * This uses the same parameters as the fb modedb.c, except for an extra
1707 * force-enable, force-enable-digital and force-disable bit at the end::
1708 *
1709 *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1710 *
1711 * Additionals options can be provided following the mode, using a comma to
1712 * separate each option. Valid options can be found in
1713 * Documentation/fb/modedb.rst.
1714 *
1715 * The intermediate drm_cmdline_mode structure is required to store additional
1716 * options from the command line modline like the force-enable/disable flag.
1717 *
1718 * Returns:
1719 * True if a valid modeline has been parsed, false otherwise.
1720 */
1721bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1722					       const struct drm_connector *connector,
1723					       struct drm_cmdline_mode *mode)
1724{
1725	const char *name;
1726	bool named_mode = false, parse_extras = false;
1727	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1728	unsigned int mode_end = 0;
1729	char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1730	char *options_ptr = NULL;
1731	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1732	int ret;
1733
1734#ifdef CONFIG_FB
1735	if (!mode_option)
1736		mode_option = fb_mode_option;
1737#endif
1738
1739	if (!mode_option) {
1740		mode->specified = false;
1741		return false;
1742	}
1743
1744	name = mode_option;
1745
1746	/*
1747	 * This is a bit convoluted. To differentiate between the
1748	 * named modes and poorly formatted resolutions, we need a
1749	 * bunch of things:
1750	 *   - We need to make sure that the first character (which
1751	 *     would be our resolution in X) is a digit.
1752	 *   - If not, then it's either a named mode or a force on/off.
1753	 *     To distinguish between the two, we need to run the
1754	 *     extra parsing function, and if not, then we consider it
1755	 *     a named mode.
1756	 *
1757	 * If this isn't enough, we should add more heuristics here,
1758	 * and matching unit-tests.
1759	 */
1760	if (!isdigit(name[0]) && name[0] != 'x') {
1761		unsigned int namelen = strlen(name);
1762
1763		/*
1764		 * Only the force on/off options can be in that case,
1765		 * and they all take a single character.
1766		 */
1767		if (namelen == 1) {
1768			ret = drm_mode_parse_cmdline_extra(name, namelen, true,
1769							   connector, mode);
1770			if (!ret)
1771				return true;
1772		}
1773
1774		named_mode = true;
1775	}
1776
1777	/* Try to locate the bpp and refresh specifiers, if any */
1778	bpp_ptr = strchr(name, '-');
1779	if (bpp_ptr) {
 
 
1780		bpp_off = bpp_ptr - name;
1781		mode->bpp_specified = true;
1782	}
1783
1784	refresh_ptr = strchr(name, '@');
1785	if (refresh_ptr) {
1786		if (named_mode)
1787			return false;
1788
 
 
1789		refresh_off = refresh_ptr - name;
1790		mode->refresh_specified = true;
1791	}
1792
1793	/* Locate the start of named options */
1794	options_ptr = strchr(name, ',');
1795	if (options_ptr)
1796		options_off = options_ptr - name;
1797
1798	/* Locate the end of the name / resolution, and parse it */
1799	if (bpp_ptr) {
1800		mode_end = bpp_off;
1801	} else if (refresh_ptr) {
1802		mode_end = refresh_off;
1803	} else if (options_ptr) {
1804		mode_end = options_off;
 
1805	} else {
1806		mode_end = strlen(name);
1807		parse_extras = true;
1808	}
1809
1810	if (named_mode) {
1811		if (mode_end + 1 > DRM_DISPLAY_MODE_LEN)
1812			return false;
1813
1814		if (!drm_named_mode_is_in_whitelist(name, mode_end))
1815			return false;
 
1816
1817		strscpy(mode->name, name, mode_end + 1);
1818	} else {
 
 
 
 
 
 
 
1819		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1820						      parse_extras,
1821						      connector,
1822						      mode);
1823		if (ret)
1824			return false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1825	}
1826	mode->specified = true;
1827
1828	if (bpp_ptr) {
1829		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1830		if (ret)
1831			return false;
 
 
1832	}
1833
1834	if (refresh_ptr) {
1835		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1836						     &refresh_end_ptr, mode);
1837		if (ret)
1838			return false;
 
 
1839	}
1840
1841	/*
1842	 * Locate the end of the bpp / refresh, and parse the extras
1843	 * if relevant
1844	 */
1845	if (bpp_ptr && refresh_ptr)
1846		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1847	else if (bpp_ptr)
1848		extra_ptr = bpp_end_ptr;
1849	else if (refresh_ptr)
1850		extra_ptr = refresh_end_ptr;
1851
1852	if (extra_ptr &&
1853	    extra_ptr != options_ptr) {
1854		int len = strlen(name) - (extra_ptr - name);
 
 
1855
1856		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, false,
1857						   connector, mode);
1858		if (ret)
1859			return false;
1860	}
1861
1862	if (options_ptr) {
1863		int len = strlen(name) - (options_ptr - name);
1864
1865		ret = drm_mode_parse_cmdline_options(options_ptr, len,
1866						     connector, mode);
1867		if (ret)
1868			return false;
1869	}
1870
1871	return true;
1872}
1873EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1874
1875/**
1876 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1877 * @dev: DRM device to create the new mode for
1878 * @cmd: input command line modeline
1879 *
1880 * Returns:
1881 * Pointer to converted mode on success, NULL on error.
1882 */
1883struct drm_display_mode *
1884drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1885				  struct drm_cmdline_mode *cmd)
1886{
1887	struct drm_display_mode *mode;
1888
 
 
 
1889	if (cmd->cvt)
1890		mode = drm_cvt_mode(dev,
1891				    cmd->xres, cmd->yres,
1892				    cmd->refresh_specified ? cmd->refresh : 60,
1893				    cmd->rb, cmd->interlace,
1894				    cmd->margins);
1895	else
1896		mode = drm_gtf_mode(dev,
1897				    cmd->xres, cmd->yres,
1898				    cmd->refresh_specified ? cmd->refresh : 60,
1899				    cmd->interlace,
1900				    cmd->margins);
1901	if (!mode)
1902		return NULL;
1903
1904	mode->type |= DRM_MODE_TYPE_USERDEF;
1905	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1906	if (cmd->xres == 1366)
1907		drm_mode_fixup_1366x768(mode);
1908	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1909	return mode;
1910}
1911EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1912
1913/**
1914 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1915 * @out: drm_mode_modeinfo struct to return to the user
1916 * @in: drm_display_mode to use
1917 *
1918 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1919 * the user.
1920 */
1921void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1922			       const struct drm_display_mode *in)
1923{
1924	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1925	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1926	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1927	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1928	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1929	     "timing values too large for mode info\n");
1930
1931	out->clock = in->clock;
1932	out->hdisplay = in->hdisplay;
1933	out->hsync_start = in->hsync_start;
1934	out->hsync_end = in->hsync_end;
1935	out->htotal = in->htotal;
1936	out->hskew = in->hskew;
1937	out->vdisplay = in->vdisplay;
1938	out->vsync_start = in->vsync_start;
1939	out->vsync_end = in->vsync_end;
1940	out->vtotal = in->vtotal;
1941	out->vscan = in->vscan;
1942	out->vrefresh = in->vrefresh;
1943	out->flags = in->flags;
1944	out->type = in->type;
1945
1946	switch (in->picture_aspect_ratio) {
1947	case HDMI_PICTURE_ASPECT_4_3:
1948		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1949		break;
1950	case HDMI_PICTURE_ASPECT_16_9:
1951		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1952		break;
1953	case HDMI_PICTURE_ASPECT_64_27:
1954		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1955		break;
1956	case HDMI_PICTURE_ASPECT_256_135:
1957		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1958		break;
1959	default:
1960		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
1961		     in->picture_aspect_ratio);
1962		/* fall through */
1963	case HDMI_PICTURE_ASPECT_NONE:
1964		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
1965		break;
1966	}
1967
1968	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1969	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1970}
1971
1972/**
1973 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1974 * @dev: drm device
1975 * @out: drm_display_mode to return to the user
1976 * @in: drm_mode_modeinfo to use
1977 *
1978 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1979 * the caller.
1980 *
1981 * Returns:
1982 * Zero on success, negative errno on failure.
1983 */
1984int drm_mode_convert_umode(struct drm_device *dev,
1985			   struct drm_display_mode *out,
1986			   const struct drm_mode_modeinfo *in)
1987{
1988	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
1989		return -ERANGE;
1990
1991	out->clock = in->clock;
1992	out->hdisplay = in->hdisplay;
1993	out->hsync_start = in->hsync_start;
1994	out->hsync_end = in->hsync_end;
1995	out->htotal = in->htotal;
1996	out->hskew = in->hskew;
1997	out->vdisplay = in->vdisplay;
1998	out->vsync_start = in->vsync_start;
1999	out->vsync_end = in->vsync_end;
2000	out->vtotal = in->vtotal;
2001	out->vscan = in->vscan;
2002	out->vrefresh = in->vrefresh;
2003	out->flags = in->flags;
2004	/*
2005	 * Old xf86-video-vmware (possibly others too) used to
2006	 * leave 'type' unititialized. Just ignore any bits we
2007	 * don't like. It's a just hint after all, and more
2008	 * useful for the kernel->userspace direction anyway.
2009	 */
2010	out->type = in->type & DRM_MODE_TYPE_ALL;
2011	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2012	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2013
2014	/* Clearing picture aspect ratio bits from out flags,
2015	 * as the aspect-ratio information is not stored in
2016	 * flags for kernel-mode, but in picture_aspect_ratio.
2017	 */
2018	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2019
2020	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2021	case DRM_MODE_FLAG_PIC_AR_4_3:
2022		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2023		break;
2024	case DRM_MODE_FLAG_PIC_AR_16_9:
2025		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2026		break;
2027	case DRM_MODE_FLAG_PIC_AR_64_27:
2028		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2029		break;
2030	case DRM_MODE_FLAG_PIC_AR_256_135:
2031		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2032		break;
2033	case DRM_MODE_FLAG_PIC_AR_NONE:
2034		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2035		break;
2036	default:
2037		return -EINVAL;
2038	}
2039
2040	out->status = drm_mode_validate_driver(dev, out);
2041	if (out->status != MODE_OK)
2042		return -EINVAL;
2043
2044	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2045
2046	return 0;
2047}
2048
2049/**
2050 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2051 * output format
2052 *
2053 * @display: display under action
2054 * @mode: video mode to be tested.
2055 *
2056 * Returns:
2057 * true if the mode can be supported in YCBCR420 format
2058 * false if not.
2059 */
2060bool drm_mode_is_420_only(const struct drm_display_info *display,
2061			  const struct drm_display_mode *mode)
2062{
2063	u8 vic = drm_match_cea_mode(mode);
2064
2065	return test_bit(vic, display->hdmi.y420_vdb_modes);
2066}
2067EXPORT_SYMBOL(drm_mode_is_420_only);
2068
2069/**
2070 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2071 * output format also (along with RGB/YCBCR444/422)
2072 *
2073 * @display: display under action.
2074 * @mode: video mode to be tested.
2075 *
2076 * Returns:
2077 * true if the mode can be support YCBCR420 format
2078 * false if not.
2079 */
2080bool drm_mode_is_420_also(const struct drm_display_info *display,
2081			  const struct drm_display_mode *mode)
2082{
2083	u8 vic = drm_match_cea_mode(mode);
2084
2085	return test_bit(vic, display->hdmi.y420_cmdb_modes);
2086}
2087EXPORT_SYMBOL(drm_mode_is_420_also);
2088/**
2089 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2090 * output format
2091 *
2092 * @display: display under action.
2093 * @mode: video mode to be tested.
2094 *
2095 * Returns:
2096 * true if the mode can be supported in YCBCR420 format
2097 * false if not.
2098 */
2099bool drm_mode_is_420(const struct drm_display_info *display,
2100		     const struct drm_display_mode *mode)
2101{
2102	return drm_mode_is_420_only(display, mode) ||
2103		drm_mode_is_420_also(display, mode);
2104}
2105EXPORT_SYMBOL(drm_mode_is_420);