sys/dev/drm/drm_modes.c

   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/list.h>
  34 #include <linux/export.h>
  35 #include <drm/drmP.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_modes.h>
  38
  39 #include "drm_crtc_internal.h"
  40
  41 /**
  42  * drm_mode_debug_printmodeline - print a mode to dmesg
  43  * @mode: mode to print
  44  *
  45  * Describe @mode using DRM_DEBUG.
  46  */
  47 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  48 {
  49         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  50                         "0x%x 0x%x\n",
  51                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  52                 mode->hdisplay, mode->hsync_start,
  53                 mode->hsync_end, mode->htotal,
  54                 mode->vdisplay, mode->vsync_start,
  55                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  56 }
  57 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  58
  59 /**
  60  * drm_mode_create - create a new display mode
  61  * @dev: DRM device
  62  *
  63  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
  64  * and return it.
  65  *
  66  * Returns:
  67  * Pointer to new mode on success, NULL on error.
  68  */
  69 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
  70 {
  71         struct drm_display_mode *nmode;
  72
  73         nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
  74         if (!nmode)
  75                 return NULL;
  76
  77         if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
  78                 kfree(nmode);
  79                 return NULL;
  80         }
  81
  82         return nmode;
  83 }
  84 EXPORT_SYMBOL(drm_mode_create);
  85
  86 /**
  87  * drm_mode_destroy - remove a mode
  88  * @dev: DRM device
  89  * @mode: mode to remove
  90  *
  91  * Release @mode's unique ID, then free it @mode structure itself using kfree.
  92  */
  93 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
  94 {
  95         if (!mode)
  96                 return;
  97
  98         drm_mode_object_put(dev, &mode->base);
  99
 100         kfree(mode);
 101 }
 102 EXPORT_SYMBOL(drm_mode_destroy);
 103
 104 /**
 105  * drm_mode_probed_add - add a mode to a connector's probed_mode list
 106  * @connector: connector the new mode
 107  * @mode: mode data
 108  *
 109  * Add @mode to @connector's probed_mode list for later use. This list should
 110  * then in a second step get filtered and all the modes actually supported by
 111  * the hardware moved to the @connector's modes list.
 112  */
 113 void drm_mode_probed_add(struct drm_connector *connector,
 114                          struct drm_display_mode *mode)
 115 {
 116         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
 117
 118         list_add_tail(&mode->head, &connector->probed_modes);
 119 }
 120 EXPORT_SYMBOL(drm_mode_probed_add);
 121
 122 /**
 123  * drm_cvt_mode -create a modeline based on the CVT algorithm
 124  * @dev: drm device
 125  * @hdisplay: hdisplay size
 126  * @vdisplay: vdisplay size
 127  * @vrefresh: vrefresh rate
 128  * @reduced: whether to use reduced blanking
 129  * @interlaced: whether to compute an interlaced mode
 130  * @margins: whether to add margins (borders)
 131  *
 132  * This function is called to generate the modeline based on CVT algorithm
 133  * according to the hdisplay, vdisplay, vrefresh.
 134  * It is based from the VESA(TM) Coordinated Video Timing Generator by
 135  * Graham Loveridge April 9, 2003 available at
 136  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
 137  *
 138  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
 139  * What I have done is to translate it by using integer calculation.
 140  *
 141  * Returns:
 142  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
 143  * The display mode object is allocated with drm_mode_create(). Returns NULL
 144  * when no mode could be allocated.
 145  */
 146 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
 147                                       int vdisplay, int vrefresh,
 148                                       bool reduced, bool interlaced, bool margins)
 149 {
 150 #define HV_FACTOR                       1000
 151         /* 1) top/bottom margin size (% of height) - default: 1.8, */
 152 #define CVT_MARGIN_PERCENTAGE           18
 153         /* 2) character cell horizontal granularity (pixels) - default 8 */
 154 #define CVT_H_GRANULARITY               8
 155         /* 3) Minimum vertical porch (lines) - default 3 */
 156 #define CVT_MIN_V_PORCH                 3
 157         /* 4) Minimum number of vertical back porch lines - default 6 */
 158 #define CVT_MIN_V_BPORCH                6
 159         /* Pixel Clock step (kHz) */
 160 #define CVT_CLOCK_STEP                  250
 161         struct drm_display_mode *drm_mode;
 162         unsigned int vfieldrate, hperiod;
 163         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
 164         int interlace;
 165
 166         /* allocate the drm_display_mode structure. If failure, we will
 167          * return directly
 168          */
 169         drm_mode = drm_mode_create(dev);
 170         if (!drm_mode)
 171                 return NULL;
 172
 173         /* the CVT default refresh rate is 60Hz */
 174         if (!vrefresh)
 175                 vrefresh = 60;
 176
 177         /* the required field fresh rate */
 178         if (interlaced)
 179                 vfieldrate = vrefresh * 2;
 180         else
 181                 vfieldrate = vrefresh;
 182
 183         /* horizontal pixels */
 184         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
 185
 186         /* determine the left&right borders */
 187         hmargin = 0;
 188         if (margins) {
 189                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 190                 hmargin -= hmargin % CVT_H_GRANULARITY;
 191         }
 192         /* find the total active pixels */
 193         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
 194
 195         /* find the number of lines per field */
 196         if (interlaced)
 197                 vdisplay_rnd = vdisplay / 2;
 198         else
 199                 vdisplay_rnd = vdisplay;
 200
 201         /* find the top & bottom borders */
 202         vmargin = 0;
 203         if (margins)
 204                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 205
 206         drm_mode->vdisplay = vdisplay + 2 * vmargin;
 207
 208         /* Interlaced */
 209         if (interlaced)
 210                 interlace = 1;
 211         else
 212                 interlace = 0;
 213
 214         /* Determine VSync Width from aspect ratio */
 215         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
 216                 vsync = 4;
 217         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
 218                 vsync = 5;
 219         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
 220                 vsync = 6;
 221         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
 222                 vsync = 7;
 223         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
 224                 vsync = 7;
 225         else /* custom */
 226                 vsync = 10;
 227
 228         if (!reduced) {
 229                 /* simplify the GTF calculation */
 230                 /* 4) Minimum time of vertical sync + back porch interval (µs)
 231                  * default 550.0
 232                  */
 233                 int tmp1, tmp2;
 234 #define CVT_MIN_VSYNC_BP        550
 235                 /* 3) Nominal HSync width (% of line period) - default 8 */
 236 #define CVT_HSYNC_PERCENTAGE    8
 237                 unsigned int hblank_percentage;
 238                 int vsyncandback_porch, vback_porch, hblank;
 239
 240                 /* estimated the horizontal period */
 241                 tmp1 = HV_FACTOR * 1000000  -
 242                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
 243                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
 244                                 interlace;
 245                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
 246
 247                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
 248                 /* 9. Find number of lines in sync + backporch */
 249                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
 250                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
 251                 else
 252                         vsyncandback_porch = tmp1;
 253                 /* 10. Find number of lines in back porch */
 254                 vback_porch = vsyncandback_porch - vsync;
 255                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
 256                                 vsyncandback_porch + CVT_MIN_V_PORCH;
 257                 /* 5) Definition of Horizontal blanking time limitation */
 258                 /* Gradient (%/kHz) - default 600 */
 259 #define CVT_M_FACTOR    600
 260                 /* Offset (%) - default 40 */
 261 #define CVT_C_FACTOR    40
 262                 /* Blanking time scaling factor - default 128 */
 263 #define CVT_K_FACTOR    128
 264                 /* Scaling factor weighting - default 20 */
 265 #define CVT_J_FACTOR    20
 266 #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
 267 #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
 268                          CVT_J_FACTOR)
 269                 /* 12. Find ideal blanking duty cycle from formula */
 270                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
 271                                         hperiod / 1000;
 272                 /* 13. Blanking time */
 273                 if (hblank_percentage < 20 * HV_FACTOR)
 274                         hblank_percentage = 20 * HV_FACTOR;
 275                 hblank = drm_mode->hdisplay * hblank_percentage /
 276                          (100 * HV_FACTOR - hblank_percentage);
 277                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
 278                 /* 14. find the total pixes per line */
 279                 drm_mode->htotal = drm_mode->hdisplay + hblank;
 280                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
 281                 drm_mode->hsync_start = drm_mode->hsync_end -
 282                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
 283                 drm_mode->hsync_start += CVT_H_GRANULARITY -
 284                         drm_mode->hsync_start % CVT_H_GRANULARITY;
 285                 /* fill the Vsync values */
 286                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
 287                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 288         } else {
 289                 /* Reduced blanking */
 290                 /* Minimum vertical blanking interval time (µs)- default 460 */
 291 #define CVT_RB_MIN_VBLANK       460
 292                 /* Fixed number of clocks for horizontal sync */
 293 #define CVT_RB_H_SYNC           32
 294                 /* Fixed number of clocks for horizontal blanking */
 295 #define CVT_RB_H_BLANK          160
 296                 /* Fixed number of lines for vertical front porch - default 3*/
 297 #define CVT_RB_VFPORCH          3
 298                 int vbilines;
 299                 int tmp1, tmp2;
 300                 /* 8. Estimate Horizontal period. */
 301                 tmp1 = HV_FACTOR * 1000000 -
 302                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
 303                 tmp2 = vdisplay_rnd + 2 * vmargin;
 304                 hperiod = tmp1 / (tmp2 * vfieldrate);
 305                 /* 9. Find number of lines in vertical blanking */
 306                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
 307                 /* 10. Check if vertical blanking is sufficient */
 308                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
 309                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
 310                 /* 11. Find total number of lines in vertical field */
 311                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
 312                 /* 12. Find total number of pixels in a line */
 313                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
 314                 /* Fill in HSync values */
 315                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
 316                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
 317                 /* Fill in VSync values */
 318                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
 319                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 320         }
 321         /* 15/13. Find pixel clock frequency (kHz for xf86) */
 322         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
 323         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
 324         /* 18/16. Find actual vertical frame frequency */
 325         /* ignore - just set the mode flag for interlaced */
 326         if (interlaced) {
 327                 drm_mode->vtotal *= 2;
 328                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 329         }
 330         /* Fill the mode line name */
 331         drm_mode_set_name(drm_mode);
 332         if (reduced)
 333                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
 334                                         DRM_MODE_FLAG_NVSYNC);
 335         else
 336                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
 337                                         DRM_MODE_FLAG_NHSYNC);
 338
 339         return drm_mode;
 340 }
 341 EXPORT_SYMBOL(drm_cvt_mode);
 342
 343 /**
 344  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
 345  * @dev: drm device
 346  * @hdisplay: hdisplay size
 347  * @vdisplay: vdisplay size
 348  * @vrefresh: vrefresh rate.
 349  * @interlaced: whether to compute an interlaced mode
 350  * @margins: desired margin (borders) size
 351  * @GTF_M: extended GTF formula parameters
 352  * @GTF_2C: extended GTF formula parameters
 353  * @GTF_K: extended GTF formula parameters
 354  * @GTF_2J: extended GTF formula parameters
 355  *
 356  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
 357  * in here multiplied by two.  For a C of 40, pass in 80.
 358  *
 359  * Returns:
 360  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
 361  * The display mode object is allocated with drm_mode_create(). Returns NULL
 362  * when no mode could be allocated.
 363  */
 364 struct drm_display_mode *
 365 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
 366                      int vrefresh, bool interlaced, int margins,
 367                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
 368 {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
 369 #define GTF_MARGIN_PERCENTAGE           18
 370         /* 2) character cell horizontal granularity (pixels) - default 8 */
 371 #define GTF_CELL_GRAN                   8
 372         /* 3) Minimum vertical porch (lines) - default 3 */
 373 #define GTF_MIN_V_PORCH                 1
 374         /* width of vsync in lines */
 375 #define V_SYNC_RQD                      3
 376         /* width of hsync as % of total line */
 377 #define H_SYNC_PERCENT                  8
 378         /* min time of vsync + back porch (microsec) */
 379 #define MIN_VSYNC_PLUS_BP               550
 380         /* C' and M' are part of the Blanking Duty Cycle computation */
 381 #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
 382 #define GTF_M_PRIME     (GTF_K * GTF_M / 256)
 383         struct drm_display_mode *drm_mode;
 384         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
 385         int top_margin, bottom_margin;
 386         int interlace;
 387         unsigned int hfreq_est;
 388         int vsync_plus_bp, vback_porch;
 389         unsigned int vtotal_lines, vfieldrate_est, hperiod;
 390         unsigned int vfield_rate, vframe_rate;
 391         int left_margin, right_margin;
 392         unsigned int total_active_pixels, ideal_duty_cycle;
 393         unsigned int hblank, total_pixels, pixel_freq;
 394         int hsync, hfront_porch, vodd_front_porch_lines;
 395         unsigned int tmp1, tmp2;
 396
 397         drm_mode = drm_mode_create(dev);
 398         if (!drm_mode)
 399                 return NULL;
 400
 401         /* 1. In order to give correct results, the number of horizontal
 402          * pixels requested is first processed to ensure that it is divisible
 403          * by the character size, by rounding it to the nearest character
 404          * cell boundary:
 405          */
 406         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 407         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
 408
 409         /* 2. If interlace is requested, the number of vertical lines assumed
 410          * by the calculation must be halved, as the computation calculates
 411          * the number of vertical lines per field.
 412          */
 413         if (interlaced)
 414                 vdisplay_rnd = vdisplay / 2;
 415         else
 416                 vdisplay_rnd = vdisplay;
 417
 418         /* 3. Find the frame rate required: */
 419         if (interlaced)
 420                 vfieldrate_rqd = vrefresh * 2;
 421         else
 422                 vfieldrate_rqd = vrefresh;
 423
 424         /* 4. Find number of lines in Top margin: */
 425         top_margin = 0;
 426         if (margins)
 427                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 428                                 1000;
 429         /* 5. Find number of lines in bottom margin: */
 430         bottom_margin = top_margin;
 431
 432         /* 6. If interlace is required, then set variable interlace: */
 433         if (interlaced)
 434                 interlace = 1;
 435         else
 436                 interlace = 0;
 437
 438         /* 7. Estimate the Horizontal frequency */
 439         {
 440                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
 441                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
 442                                 2 + interlace;
 443                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
 444         }
 445
 446         /* 8. Find the number of lines in V sync + back porch */
 447         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
 448         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
 449         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
 450         /*  9. Find the number of lines in V back porch alone: */
 451         vback_porch = vsync_plus_bp - V_SYNC_RQD;
 452         /*  10. Find the total number of lines in Vertical field period: */
 453         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
 454                         vsync_plus_bp + GTF_MIN_V_PORCH;
 455         /*  11. Estimate the Vertical field frequency: */
 456         vfieldrate_est = hfreq_est / vtotal_lines;
 457         /*  12. Find the actual horizontal period: */
 458         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
 459
 460         /*  13. Find the actual Vertical field frequency: */
 461         vfield_rate = hfreq_est / vtotal_lines;
 462         /*  14. Find the Vertical frame frequency: */
 463         if (interlaced)
 464                 vframe_rate = vfield_rate / 2;
 465         else
 466                 vframe_rate = vfield_rate;
 467         /*  15. Find number of pixels in left margin: */
 468         if (margins)
 469                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 470                                 1000;
 471         else
 472                 left_margin = 0;
 473
 474         /* 16.Find number of pixels in right margin: */
 475         right_margin = left_margin;
 476         /* 17.Find total number of active pixels in image and left and right */
 477         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
 478         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
 479         ideal_duty_cycle = GTF_C_PRIME * 1000 -
 480                                 (GTF_M_PRIME * 1000000 / hfreq_est);
 481         /* 19.Find the number of pixels in the blanking time to the nearest
 482          * double character cell: */
 483         hblank = total_active_pixels * ideal_duty_cycle /
 484                         (100000 - ideal_duty_cycle);
 485         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
 486         hblank = hblank * 2 * GTF_CELL_GRAN;
 487         /* 20.Find total number of pixels: */
 488         total_pixels = total_active_pixels + hblank;
 489         /* 21.Find pixel clock frequency: */
 490         pixel_freq = total_pixels * hfreq_est / 1000;
 491         /* Stage 1 computations are now complete; I should really pass
 492          * the results to another function and do the Stage 2 computations,
 493          * but I only need a few more values so I'll just append the
 494          * computations here for now */
 495         /* 17. Find the number of pixels in the horizontal sync period: */
 496         hsync = H_SYNC_PERCENT * total_pixels / 100;
 497         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 498         hsync = hsync * GTF_CELL_GRAN;
 499         /* 18. Find the number of pixels in horizontal front porch period */
 500         hfront_porch = hblank / 2 - hsync;
 501         /*  36. Find the number of lines in the odd front porch period: */
 502         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
 503
 504         /* finally, pack the results in the mode struct */
 505         drm_mode->hdisplay = hdisplay_rnd;
 506         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
 507         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
 508         drm_mode->htotal = total_pixels;
 509         drm_mode->vdisplay = vdisplay_rnd;
 510         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
 511         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
 512         drm_mode->vtotal = vtotal_lines;
 513
 514         drm_mode->clock = pixel_freq;
 515
 516         if (interlaced) {
 517                 drm_mode->vtotal *= 2;
 518                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 519         }
 520
 521         drm_mode_set_name(drm_mode);
 522         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
 523                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
 524         else
 525                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 526
 527         return drm_mode;
 528 }
 529 EXPORT_SYMBOL(drm_gtf_mode_complex);
 530
 531 /**
 532  * drm_gtf_mode - create the modeline based on the GTF algorithm
 533  * @dev: drm device
 534  * @hdisplay: hdisplay size
 535  * @vdisplay: vdisplay size
 536  * @vrefresh: vrefresh rate.
 537  * @interlaced: whether to compute an interlaced mode
 538  * @margins: desired margin (borders) size
 539  *
 540  * return the modeline based on GTF algorithm
 541  *
 542  * This function is to create the modeline based on the GTF algorithm.
 543  * Generalized Timing Formula is derived from:
 544  *      GTF Spreadsheet by Andy Morrish (1/5/97)
 545  *      available at http://www.vesa.org
 546  *
 547  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
 548  * What I have done is to translate it by using integer calculation.
 549  * I also refer to the function of fb_get_mode in the file of
 550  * drivers/video/fbmon.c
 551  *
 552  * Standard GTF parameters:
 553  * M = 600
 554  * C = 40
 555  * K = 128
 556  * J = 20
 557  *
 558  * Returns:
 559  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
 560  * The display mode object is allocated with drm_mode_create(). Returns NULL
 561  * when no mode could be allocated.
 562  */
 563 struct drm_display_mode *
 564 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
 565              bool interlaced, int margins)
 566 {
 567         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
 568                                     interlaced, margins,
 569                                     600, 40 * 2, 128, 20 * 2);
 570 }
 571 EXPORT_SYMBOL(drm_gtf_mode);
 572
 573 #ifdef CONFIG_VIDEOMODE_HELPERS
 574 /**
 575  * drm_display_mode_from_videomode - fill in @dmode using @vm,
 576  * @vm: videomode structure to use as source
 577  * @dmode: drm_display_mode structure to use as destination
 578  *
 579  * Fills out @dmode using the display mode specified in @vm.
 580  */
 581 void drm_display_mode_from_videomode(const struct videomode *vm,
 582                                      struct drm_display_mode *dmode)
 583 {
 584         dmode->hdisplay = vm->hactive;
 585         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
 586         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
 587         dmode->htotal = dmode->hsync_end + vm->hback_porch;
 588
 589         dmode->vdisplay = vm->vactive;
 590         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
 591         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
 592         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
 593
 594         dmode->clock = vm->pixelclock / 1000;
 595
 596         dmode->flags = 0;
 597         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 598                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
 599         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
 600                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
 601         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 602                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
 603         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
 604                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
 605         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
 606                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
 607         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
 608                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
 609         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 610                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 611         drm_mode_set_name(dmode);
 612 }
 613
 614 #ifdef CONFIG_OF
 615 /**
 616  * of_get_drm_display_mode - get a drm_display_mode from devicetree
 617  * @np: device_node with the timing specification
 618  * @dmode: will be set to the return value
 619  * @index: index into the list of display timings in devicetree
 620  *
 621  * This function is expensive and should only be used, if only one mode is to be
 622  * read from DT. To get multiple modes start with of_get_display_timings and
 623  * work with that instead.
 624  *
 625  * Returns:
 626  * 0 on success, a negative errno code when no of videomode node was found.
 627  */
 628 int of_get_drm_display_mode(struct device_node *np,
 629                             struct drm_display_mode *dmode, int index)
 630 {
 631         struct videomode vm;
 632         int ret;
 633
 634         ret = of_get_videomode(np, &vm, index);
 635         if (ret)
 636                 return ret;
 637
 638         drm_display_mode_from_videomode(&vm, dmode);
 639
 640         pr_debug("%s: got %dx%d display mode from %s\n",
 641                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
 642         drm_mode_debug_printmodeline(dmode);
 643
 644         return 0;
 645 }
 646 #endif /* CONFIG_OF */
 647 #endif /* CONFIG_VIDEOMODE_HELPERS */
 648
 649 /**
 650  * drm_mode_set_name - set the name on a mode
 651  * @mode: name will be set in this mode
 652  *
 653  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
 654  * with an optional 'i' suffix for interlaced modes.
 655  */
 656 void drm_mode_set_name(struct drm_display_mode *mode)
 657 {
 658         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 659
 660         ksnprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
 661                  mode->hdisplay, mode->vdisplay,
 662                  interlaced ? "i" : "");
 663 }
 664 EXPORT_SYMBOL(drm_mode_set_name);
 665
 666 /** drm_mode_hsync - get the hsync of a mode
 667  * @mode: mode
 668  *
 669  * Returns:
 670  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
 671  * value first if it is not yet set.
 672  */
 673 int drm_mode_hsync(const struct drm_display_mode *mode)
 674 {
 675         unsigned int calc_val;
 676
 677         if (mode->hsync)
 678                 return mode->hsync;
 679
 680         if (mode->htotal < 0)
 681                 return 0;
 682
 683         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
 684         calc_val += 500;                                /* round to 1000Hz */
 685         calc_val /= 1000;                               /* truncate to kHz */
 686
 687         return calc_val;
 688 }
 689 EXPORT_SYMBOL(drm_mode_hsync);
 690
 691 /**
 692  * drm_mode_vrefresh - get the vrefresh of a mode
 693  * @mode: mode
 694  *
 695  * Returns:
 696  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
 697  * value first if it is not yet set.
 698  */
 699 int drm_mode_vrefresh(const struct drm_display_mode *mode)
 700 {
 701         int refresh = 0;
 702         unsigned int calc_val;
 703
 704         if (mode->vrefresh > 0)
 705                 refresh = mode->vrefresh;
 706         else if (mode->htotal > 0 && mode->vtotal > 0) {
 707                 int vtotal;
 708                 vtotal = mode->vtotal;
 709                 /* work out vrefresh the value will be x1000 */
 710                 calc_val = (mode->clock * 1000);
 711                 calc_val /= mode->htotal;
 712                 refresh = (calc_val + vtotal / 2) / vtotal;
 713
 714                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 715                         refresh *= 2;
 716                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 717                         refresh /= 2;
 718                 if (mode->vscan > 1)
 719                         refresh /= mode->vscan;
 720         }
 721         return refresh;
 722 }
 723 EXPORT_SYMBOL(drm_mode_vrefresh);
 724
 725 /**
 726  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
 727  * @p: mode
 728  * @adjust_flags: a combination of adjustment flags
 729  *
 730  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
 731  *
 732  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
 733  *   interlaced modes.
 734  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
 735  *   buffers containing two eyes (only adjust the timings when needed, eg. for
 736  *   "frame packing" or "side by side full").
 737  */
 738 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
 739 {
 740         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
 741                 return;
 742
 743         p->crtc_clock = p->clock;
 744         p->crtc_hdisplay = p->hdisplay;
 745         p->crtc_hsync_start = p->hsync_start;
 746         p->crtc_hsync_end = p->hsync_end;
 747         p->crtc_htotal = p->htotal;
 748         p->crtc_hskew = p->hskew;
 749         p->crtc_vdisplay = p->vdisplay;
 750         p->crtc_vsync_start = p->vsync_start;
 751         p->crtc_vsync_end = p->vsync_end;
 752         p->crtc_vtotal = p->vtotal;
 753
 754         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
 755                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
 756                         p->crtc_vdisplay /= 2;
 757                         p->crtc_vsync_start /= 2;
 758                         p->crtc_vsync_end /= 2;
 759                         p->crtc_vtotal /= 2;
 760                 }
 761         }
 762
 763         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
 764                 p->crtc_vdisplay *= 2;
 765                 p->crtc_vsync_start *= 2;
 766                 p->crtc_vsync_end *= 2;
 767                 p->crtc_vtotal *= 2;
 768         }
 769
 770         if (p->vscan > 1) {
 771                 p->crtc_vdisplay *= p->vscan;
 772                 p->crtc_vsync_start *= p->vscan;
 773                 p->crtc_vsync_end *= p->vscan;
 774                 p->crtc_vtotal *= p->vscan;
 775         }
 776
 777         if (adjust_flags & CRTC_STEREO_DOUBLE) {
 778                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
 779
 780                 switch (layout) {
 781                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
 782                         p->crtc_clock *= 2;
 783                         p->crtc_vdisplay += p->crtc_vtotal;
 784                         p->crtc_vsync_start += p->crtc_vtotal;
 785                         p->crtc_vsync_end += p->crtc_vtotal;
 786                         p->crtc_vtotal += p->crtc_vtotal;
 787                         break;
 788                 }
 789         }
 790
 791         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
 792         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 793         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
 794         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
 795 }
 796 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 797
 798 /**
 799  * drm_mode_copy - copy the mode
 800  * @dst: mode to overwrite
 801  * @src: mode to copy
 802  *
 803  * Copy an existing mode into another mode, preserving the object id and
 804  * list head of the destination mode.
 805  */
 806 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
 807 {
 808         int id = dst->base.id;
 809         struct list_head head = dst->head;
 810
 811         *dst = *src;
 812         dst->base.id = id;
 813         dst->head = head;
 814 }
 815 EXPORT_SYMBOL(drm_mode_copy);
 816
 817 /**
 818  * drm_mode_duplicate - allocate and duplicate an existing mode
 819  * @dev: drm_device to allocate the duplicated mode for
 820  * @mode: mode to duplicate
 821  *
 822  * Just allocate a new mode, copy the existing mode into it, and return
 823  * a pointer to it.  Used to create new instances of established modes.
 824  *
 825  * Returns:
 826  * Pointer to duplicated mode on success, NULL on error.
 827  */
 828 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
 829                                             const struct drm_display_mode *mode)
 830 {
 831         struct drm_display_mode *nmode;
 832
 833         nmode = drm_mode_create(dev);
 834         if (!nmode)
 835                 return NULL;
 836
 837         drm_mode_copy(nmode, mode);
 838
 839         return nmode;
 840 }
 841 EXPORT_SYMBOL(drm_mode_duplicate);
 842
 843 /**
 844  * drm_mode_equal - test modes for equality
 845  * @mode1: first mode
 846  * @mode2: second mode
 847  *
 848  * Check to see if @mode1 and @mode2 are equivalent.
 849  *
 850  * Returns:
 851  * True if the modes are equal, false otherwise.
 852  */
 853 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
 854 {
 855         /* do clock check convert to PICOS so fb modes get matched
 856          * the same */
 857         if (mode1->clock && mode2->clock) {
 858                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
 859                         return false;
 860         } else if (mode1->clock != mode2->clock)
 861                 return false;
 862
 863         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
 864             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
 865                 return false;
 866
 867         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
 868 }
 869 EXPORT_SYMBOL(drm_mode_equal);
 870
 871 /**
 872  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
 873  * @mode1: first mode
 874  * @mode2: second mode
 875  *
 876  * Check to see if @mode1 and @mode2 are equivalent, but
 877  * don't check the pixel clocks nor the stereo layout.
 878  *
 879  * Returns:
 880  * True if the modes are equal, false otherwise.
 881  */
 882 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 883                                         const struct drm_display_mode *mode2)
 884 {
 885         if (mode1->hdisplay == mode2->hdisplay &&
 886             mode1->hsync_start == mode2->hsync_start &&
 887             mode1->hsync_end == mode2->hsync_end &&
 888             mode1->htotal == mode2->htotal &&
 889             mode1->hskew == mode2->hskew &&
 890             mode1->vdisplay == mode2->vdisplay &&
 891             mode1->vsync_start == mode2->vsync_start &&
 892             mode1->vsync_end == mode2->vsync_end &&
 893             mode1->vtotal == mode2->vtotal &&
 894             mode1->vscan == mode2->vscan &&
 895             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
 896              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
 897                 return true;
 898
 899         return false;
 900 }
 901 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
 902
 903 /**
 904  * drm_mode_validate_size - make sure modes adhere to size constraints
 905  * @dev: DRM device
 906  * @mode_list: list of modes to check
 907  * @maxX: maximum width
 908  * @maxY: maximum height
 909  *
 910  * This function is a helper which can be used to validate modes against size
 911  * limitations of the DRM device/connector. If a mode is too big its status
 912  * memeber is updated with the appropriate validation failure code. The list
 913  * itself is not changed.
 914  */
 915 void drm_mode_validate_size(struct drm_device *dev,
 916                             struct list_head *mode_list,
 917                             int maxX, int maxY)
 918 {
 919         struct drm_display_mode *mode;
 920
 921         list_for_each_entry(mode, mode_list, head) {
 922                 if (maxX > 0 && mode->hdisplay > maxX)
 923                         mode->status = MODE_VIRTUAL_X;
 924
 925                 if (maxY > 0 && mode->vdisplay > maxY)
 926                         mode->status = MODE_VIRTUAL_Y;
 927         }
 928 }
 929 EXPORT_SYMBOL(drm_mode_validate_size);
 930
 931 /**
 932  * drm_mode_prune_invalid - remove invalid modes from mode list
 933  * @dev: DRM device
 934  * @mode_list: list of modes to check
 935  * @verbose: be verbose about it
 936  *
 937  * This helper function can be used to prune a display mode list after
 938  * validation has been completed. All modes who's status is not MODE_OK will be
 939  * removed from the list, and if @verbose the status code and mode name is also
 940  * printed to dmesg.
 941  */
 942 void drm_mode_prune_invalid(struct drm_device *dev,
 943                             struct list_head *mode_list, bool verbose)
 944 {
 945         struct drm_display_mode *mode, *t;
 946
 947         list_for_each_entry_safe(mode, t, mode_list, head) {
 948                 if (mode->status != MODE_OK) {
 949                         list_del(&mode->head);
 950                         if (verbose) {
 951                                 drm_mode_debug_printmodeline(mode);
 952                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
 953                                         mode->name, mode->status);
 954                         }
 955                         drm_mode_destroy(dev, mode);
 956                 }
 957         }
 958 }
 959 EXPORT_SYMBOL(drm_mode_prune_invalid);
 960
 961 /**
 962  * drm_mode_compare - compare modes for favorability
 963  * @priv: unused
 964  * @lh_a: list_head for first mode
 965  * @lh_b: list_head for second mode
 966  *
 967  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
 968  * which is better.
 969  *
 970  * Returns:
 971  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
 972  * positive if @lh_b is better than @lh_a.
 973  */
 974 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
 975 {
 976         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
 977         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
 978         int diff;
 979
 980         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
 981                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
 982         if (diff)
 983                 return diff;
 984         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
 985         if (diff)
 986                 return diff;
 987
 988         diff = b->vrefresh - a->vrefresh;
 989         if (diff)
 990                 return diff;
 991
 992         diff = b->clock - a->clock;
 993         return diff;
 994 }
 995
 996 /**
 997  * drm_mode_sort - sort mode list
 998  * @mode_list: list of drm_display_mode structures to sort
 999  *
1000  * Sort @mode_list by favorability, moving good modes to the head of the list.
1001  */
1002 void drm_mode_sort(struct list_head *mode_list)
1003 {
1004         drm_list_sort(NULL, mode_list, drm_mode_compare);
1005 }
1006 EXPORT_SYMBOL(drm_mode_sort);
1007
1008 /**
1009  * drm_mode_connector_list_update - update the mode list for the connector
1010  * @connector: the connector to update
1011  * @merge_type_bits: whether to merge or overright type bits.
1012  *
1013  * This moves the modes from the @connector probed_modes list
1014  * to the actual mode list. It compares the probed mode against the current
1015  * list and only adds different/new modes.
1016  *
1017  * This is just a helper functions doesn't validate any modes itself and also
1018  * doesn't prune any invalid modes. Callers need to do that themselves.
1019  */
1020 void drm_mode_connector_list_update(struct drm_connector *connector,
1021                                     bool merge_type_bits)
1022 {
1023         struct drm_display_mode *mode;
1024         struct drm_display_mode *pmode, *pt;
1025         int found_it;
1026
1027         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1028
1029         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1030                                  head) {
1031                 found_it = 0;
1032                 /* go through current modes checking for the new probed mode */
1033                 list_for_each_entry(mode, &connector->modes, head) {
1034                         if (drm_mode_equal(pmode, mode)) {
1035                                 found_it = 1;
1036                                 /* if equal delete the probed mode */
1037                                 mode->status = pmode->status;
1038                                 /* Merge type bits together */
1039                                 if (merge_type_bits)
1040                                         mode->type |= pmode->type;
1041                                 else
1042                                         mode->type = pmode->type;
1043                                 list_del(&pmode->head);
1044                                 drm_mode_destroy(connector->dev, pmode);
1045                                 break;
1046                         }
1047                 }
1048
1049                 if (!found_it) {
1050                         list_move_tail(&pmode->head, &connector->modes);
1051                 }
1052         }
1053 }
1054 EXPORT_SYMBOL(drm_mode_connector_list_update);
1055
1056 /**
1057  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1058  * @mode_option: optional per connector mode option
1059  * @connector: connector to parse modeline for
1060  * @mode: preallocated drm_cmdline_mode structure to fill out
1061  *
1062  * This parses @mode_option command line modeline for modes and options to
1063  * configure the connector. If @mode_option is NULL the default command line
1064  * modeline in fb_mode_option will be parsed instead.
1065  *
1066  * This uses the same parameters as the fb modedb.c, except for an extra
1067  * force-enable, force-enable-digital and force-disable bit at the end:
1068  *
1069  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1070  *
1071  * The intermediate drm_cmdline_mode structure is required to store additional
1072  * options from the command line modline like the force-enabel/disable flag.
1073  *
1074  * Returns:
1075  * True if a valid modeline has been parsed, false otherwise.
1076  */
1077 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1078                                                struct drm_connector *connector,
1079                                                struct drm_cmdline_mode *mode)
1080 {
1081         const char *name;
1082         unsigned int namelen;
1083         bool res_specified = false, bpp_specified = false, refresh_specified = false;
1084         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1085         bool yres_specified = false, cvt = false, rb = false;
1086         bool interlace = false, margins = false, was_digit = false;
1087         int i;
1088         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1089
1090 #ifdef CONFIG_FB
1091         if (!mode_option)
1092                 mode_option = fb_mode_option;
1093 #endif
1094
1095         if (!mode_option) {
1096                 mode->specified = false;
1097                 return false;
1098         }
1099
1100         name = mode_option;
1101         namelen = strlen(name);
1102         for (i = namelen-1; i >= 0; i--) {
1103                 switch (name[i]) {
1104                 case '@':
1105                         if (!refresh_specified && !bpp_specified &&
1106                             !yres_specified && !cvt && !rb && was_digit) {
1107                                 refresh = simple_strtol(&name[i+1], NULL, 10);
1108                                 refresh_specified = true;
1109                                 was_digit = false;
1110                         } else
1111                                 goto done;
1112                         break;
1113                 case '-':
1114                         if (!bpp_specified && !yres_specified && !cvt &&
1115                             !rb && was_digit) {
1116                                 bpp = simple_strtol(&name[i+1], NULL, 10);
1117                                 bpp_specified = true;
1118                                 was_digit = false;
1119                         } else
1120                                 goto done;
1121                         break;
1122                 case 'x':
1123                         if (!yres_specified && was_digit) {
1124                                 yres = simple_strtol(&name[i+1], NULL, 10);
1125                                 yres_specified = true;
1126                                 was_digit = false;
1127                         } else
1128                                 goto done;
1129                         break;
1130                 case '0' ... '9':
1131                         was_digit = true;
1132                         break;
1133                 case 'M':
1134                         if (yres_specified || cvt || was_digit)
1135                                 goto done;
1136                         cvt = true;
1137                         break;
1138                 case 'R':
1139                         if (yres_specified || cvt || rb || was_digit)
1140                                 goto done;
1141                         rb = true;
1142                         break;
1143                 case 'm':
1144                         if (cvt || yres_specified || was_digit)
1145                                 goto done;
1146                         margins = true;
1147                         break;
1148                 case 'i':
1149                         if (cvt || yres_specified || was_digit)
1150                                 goto done;
1151                         interlace = true;
1152                         break;
1153                 case 'e':
1154                         if (yres_specified || bpp_specified || refresh_specified ||
1155                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1156                                 goto done;
1157
1158                         force = DRM_FORCE_ON;
1159                         break;
1160                 case 'D':
1161                         if (yres_specified || bpp_specified || refresh_specified ||
1162                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1163                                 goto done;
1164
1165                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1166                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1167                                 force = DRM_FORCE_ON;
1168                         else
1169                                 force = DRM_FORCE_ON_DIGITAL;
1170                         break;
1171                 case 'd':
1172                         if (yres_specified || bpp_specified || refresh_specified ||
1173                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1174                                 goto done;
1175
1176                         force = DRM_FORCE_OFF;
1177                         break;
1178                 default:
1179                         goto done;
1180                 }
1181         }
1182
1183         if (i < 0 && yres_specified) {
1184                 char *ch;
1185                 xres = simple_strtol(name, &ch, 10);
1186                 if ((ch != NULL) && (*ch == 'x'))
1187                         res_specified = true;
1188                 else
1189                         i = ch - name;
1190         } else if (!yres_specified && was_digit) {
1191                 /* catch mode that begins with digits but has no 'x' */
1192                 i = 0;
1193         }
1194 done:
1195         if (i >= 0) {
1196                 printk(KERN_WARNING
1197                         "parse error at position %i in video mode '%s'\n",
1198                         i, name);
1199                 mode->specified = false;
1200                 return false;
1201         }
1202
1203         if (res_specified) {
1204                 mode->specified = true;
1205                 mode->xres = xres;
1206                 mode->yres = yres;
1207         }
1208
1209         if (refresh_specified) {
1210                 mode->refresh_specified = true;
1211                 mode->refresh = refresh;
1212         }
1213
1214         if (bpp_specified) {
1215                 mode->bpp_specified = true;
1216                 mode->bpp = bpp;
1217         }
1218         mode->rb = rb;
1219         mode->cvt = cvt;
1220         mode->interlace = interlace;
1221         mode->margins = margins;
1222         mode->force = force;
1223
1224         return true;
1225 }
1226 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1227
1228 /**
1229  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1230  * @dev: DRM device to create the new mode for
1231  * @cmd: input command line modeline
1232  *
1233  * Returns:
1234  * Pointer to converted mode on success, NULL on error.
1235  */
1236 struct drm_display_mode *
1237 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1238                                   struct drm_cmdline_mode *cmd)
1239 {
1240         struct drm_display_mode *mode;
1241
1242         if (cmd->cvt)
1243                 mode = drm_cvt_mode(dev,
1244                                     cmd->xres, cmd->yres,
1245                                     cmd->refresh_specified ? cmd->refresh : 60,
1246                                     cmd->rb, cmd->interlace,
1247                                     cmd->margins);
1248         else
1249                 mode = drm_gtf_mode(dev,
1250                                     cmd->xres, cmd->yres,
1251                                     cmd->refresh_specified ? cmd->refresh : 60,
1252                                     cmd->interlace,
1253                                     cmd->margins);
1254         if (!mode)
1255                 return NULL;
1256
1257         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1258         return mode;
1259 }
1260 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);