drivers/gpu/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/list_sort.h>
  35 #include <linux/export.h>
  36 #include <drm/drmP.h>
  37 #include <drm/drm_crtc.h>
  38 #include <video/of_videomode.h>
  39 #include <video/videomode.h>
  40
  41 /**
  42  * drm_mode_debug_printmodeline - debug print a mode
  43  * @dev: DRM device
  44  * @mode: mode to print
  45  *
  46  * LOCKING:
  47  * None.
  48  *
  49  * Describe @mode using DRM_DEBUG.
  50  */
  51 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  52 {
  53         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  54                         "0x%x 0x%x\n",
  55                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  56                 mode->hdisplay, mode->hsync_start,
  57                 mode->hsync_end, mode->htotal,
  58                 mode->vdisplay, mode->vsync_start,
  59                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  60 }
  61 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  62
  63 /**
  64  * drm_cvt_mode -create a modeline based on CVT algorithm
  65  * @dev: DRM device
  66  * @hdisplay: hdisplay size
  67  * @vdisplay: vdisplay size
  68  * @vrefresh  : vrefresh rate
  69  * @reduced : Whether the GTF calculation is simplified
  70  * @interlaced:Whether the interlace is supported
  71  *
  72  * LOCKING:
  73  * none.
  74  *
  75  * return the modeline based on CVT algorithm
  76  *
  77  * This function is called to generate the modeline based on CVT algorithm
  78  * according to the hdisplay, vdisplay, vrefresh.
  79  * It is based from the VESA(TM) Coordinated Video Timing Generator by
  80  * Graham Loveridge April 9, 2003 available at
  81  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
  82  *
  83  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
  84  * What I have done is to translate it by using integer calculation.
  85  */
  86 #define HV_FACTOR                       1000
  87 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
  88                                       int vdisplay, int vrefresh,
  89                                       bool reduced, bool interlaced, bool margins)
  90 {
  91         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  92 #define CVT_MARGIN_PERCENTAGE           18
  93         /* 2) character cell horizontal granularity (pixels) - default 8 */
  94 #define CVT_H_GRANULARITY               8
  95         /* 3) Minimum vertical porch (lines) - default 3 */
  96 #define CVT_MIN_V_PORCH                 3
  97         /* 4) Minimum number of vertical back porch lines - default 6 */
  98 #define CVT_MIN_V_BPORCH                6
  99         /* Pixel Clock step (kHz) */
 100 #define CVT_CLOCK_STEP                  250
 101         struct drm_display_mode *drm_mode;
 102         unsigned int vfieldrate, hperiod;
 103         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
 104         int interlace;
 105
 106         /* allocate the drm_display_mode structure. If failure, we will
 107          * return directly
 108          */
 109         drm_mode = drm_mode_create(dev);
 110         if (!drm_mode)
 111                 return NULL;
 112
 113         /* the CVT default refresh rate is 60Hz */
 114         if (!vrefresh)
 115                 vrefresh = 60;
 116
 117         /* the required field fresh rate */
 118         if (interlaced)
 119                 vfieldrate = vrefresh * 2;
 120         else
 121                 vfieldrate = vrefresh;
 122
 123         /* horizontal pixels */
 124         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
 125
 126         /* determine the left&right borders */
 127         hmargin = 0;
 128         if (margins) {
 129                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 130                 hmargin -= hmargin % CVT_H_GRANULARITY;
 131         }
 132         /* find the total active pixels */
 133         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
 134
 135         /* find the number of lines per field */
 136         if (interlaced)
 137                 vdisplay_rnd = vdisplay / 2;
 138         else
 139                 vdisplay_rnd = vdisplay;
 140
 141         /* find the top & bottom borders */
 142         vmargin = 0;
 143         if (margins)
 144                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 145
 146         drm_mode->vdisplay = vdisplay + 2 * vmargin;
 147
 148         /* Interlaced */
 149         if (interlaced)
 150                 interlace = 1;
 151         else
 152                 interlace = 0;
 153
 154         /* Determine VSync Width from aspect ratio */
 155         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
 156                 vsync = 4;
 157         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
 158                 vsync = 5;
 159         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
 160                 vsync = 6;
 161         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
 162                 vsync = 7;
 163         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
 164                 vsync = 7;
 165         else /* custom */
 166                 vsync = 10;
 167
 168         if (!reduced) {
 169                 /* simplify the GTF calculation */
 170                 /* 4) Minimum time of vertical sync + back porch interval (µs)
 171                  * default 550.0
 172                  */
 173                 int tmp1, tmp2;
 174 #define CVT_MIN_VSYNC_BP        550
 175                 /* 3) Nominal HSync width (% of line period) - default 8 */
 176 #define CVT_HSYNC_PERCENTAGE    8
 177                 unsigned int hblank_percentage;
 178                 int vsyncandback_porch, vback_porch, hblank;
 179
 180                 /* estimated the horizontal period */
 181                 tmp1 = HV_FACTOR * 1000000  -
 182                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
 183                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
 184                                 interlace;
 185                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
 186
 187                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
 188                 /* 9. Find number of lines in sync + backporch */
 189                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
 190                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
 191                 else
 192                         vsyncandback_porch = tmp1;
 193                 /* 10. Find number of lines in back porch */
 194                 vback_porch = vsyncandback_porch - vsync;
 195                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
 196                                 vsyncandback_porch + CVT_MIN_V_PORCH;
 197                 /* 5) Definition of Horizontal blanking time limitation */
 198                 /* Gradient (%/kHz) - default 600 */
 199 #define CVT_M_FACTOR    600
 200                 /* Offset (%) - default 40 */
 201 #define CVT_C_FACTOR    40
 202                 /* Blanking time scaling factor - default 128 */
 203 #define CVT_K_FACTOR    128
 204                 /* Scaling factor weighting - default 20 */
 205 #define CVT_J_FACTOR    20
 206 #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
 207 #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
 208                          CVT_J_FACTOR)
 209                 /* 12. Find ideal blanking duty cycle from formula */
 210                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
 211                                         hperiod / 1000;
 212                 /* 13. Blanking time */
 213                 if (hblank_percentage < 20 * HV_FACTOR)
 214                         hblank_percentage = 20 * HV_FACTOR;
 215                 hblank = drm_mode->hdisplay * hblank_percentage /
 216                          (100 * HV_FACTOR - hblank_percentage);
 217                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
 218                 /* 14. find the total pixes per line */
 219                 drm_mode->htotal = drm_mode->hdisplay + hblank;
 220                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
 221                 drm_mode->hsync_start = drm_mode->hsync_end -
 222                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
 223                 drm_mode->hsync_start += CVT_H_GRANULARITY -
 224                         drm_mode->hsync_start % CVT_H_GRANULARITY;
 225                 /* fill the Vsync values */
 226                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
 227                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 228         } else {
 229                 /* Reduced blanking */
 230                 /* Minimum vertical blanking interval time (µs)- default 460 */
 231 #define CVT_RB_MIN_VBLANK       460
 232                 /* Fixed number of clocks for horizontal sync */
 233 #define CVT_RB_H_SYNC           32
 234                 /* Fixed number of clocks for horizontal blanking */
 235 #define CVT_RB_H_BLANK          160
 236                 /* Fixed number of lines for vertical front porch - default 3*/
 237 #define CVT_RB_VFPORCH          3
 238                 int vbilines;
 239                 int tmp1, tmp2;
 240                 /* 8. Estimate Horizontal period. */
 241                 tmp1 = HV_FACTOR * 1000000 -
 242                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
 243                 tmp2 = vdisplay_rnd + 2 * vmargin;
 244                 hperiod = tmp1 / (tmp2 * vfieldrate);
 245                 /* 9. Find number of lines in vertical blanking */
 246                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
 247                 /* 10. Check if vertical blanking is sufficient */
 248                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
 249                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
 250                 /* 11. Find total number of lines in vertical field */
 251                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
 252                 /* 12. Find total number of pixels in a line */
 253                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
 254                 /* Fill in HSync values */
 255                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
 256                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
 257                 /* Fill in VSync values */
 258                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
 259                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 260         }
 261         /* 15/13. Find pixel clock frequency (kHz for xf86) */
 262         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
 263         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
 264         /* 18/16. Find actual vertical frame frequency */
 265         /* ignore - just set the mode flag for interlaced */
 266         if (interlaced) {
 267                 drm_mode->vtotal *= 2;
 268                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 269         }
 270         /* Fill the mode line name */
 271         drm_mode_set_name(drm_mode);
 272         if (reduced)
 273                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
 274                                         DRM_MODE_FLAG_NVSYNC);
 275         else
 276                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
 277                                         DRM_MODE_FLAG_NHSYNC);
 278
 279         return drm_mode;
 280 }
 281 EXPORT_SYMBOL(drm_cvt_mode);
 282
 283 /**
 284  * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
 285  *
 286  * @dev         :drm device
 287  * @hdisplay    :hdisplay size
 288  * @vdisplay    :vdisplay size
 289  * @vrefresh    :vrefresh rate.
 290  * @interlaced  :whether the interlace is supported
 291  * @margins     :desired margin size
 292  * @GTF_[MCKJ]  :extended GTF formula parameters
 293  *
 294  * LOCKING.
 295  * none.
 296  *
 297  * return the modeline based on full GTF algorithm.
 298  *
 299  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
 300  * in here multiplied by two.  For a C of 40, pass in 80.
 301  */
 302 struct drm_display_mode *
 303 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
 304                      int vrefresh, bool interlaced, int margins,
 305                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
 306 {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
 307 #define GTF_MARGIN_PERCENTAGE           18
 308         /* 2) character cell horizontal granularity (pixels) - default 8 */
 309 #define GTF_CELL_GRAN                   8
 310         /* 3) Minimum vertical porch (lines) - default 3 */
 311 #define GTF_MIN_V_PORCH                 1
 312         /* width of vsync in lines */
 313 #define V_SYNC_RQD                      3
 314         /* width of hsync as % of total line */
 315 #define H_SYNC_PERCENT                  8
 316         /* min time of vsync + back porch (microsec) */
 317 #define MIN_VSYNC_PLUS_BP               550
 318         /* C' and M' are part of the Blanking Duty Cycle computation */
 319 #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
 320 #define GTF_M_PRIME     (GTF_K * GTF_M / 256)
 321         struct drm_display_mode *drm_mode;
 322         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
 323         int top_margin, bottom_margin;
 324         int interlace;
 325         unsigned int hfreq_est;
 326         int vsync_plus_bp, vback_porch;
 327         unsigned int vtotal_lines, vfieldrate_est, hperiod;
 328         unsigned int vfield_rate, vframe_rate;
 329         int left_margin, right_margin;
 330         unsigned int total_active_pixels, ideal_duty_cycle;
 331         unsigned int hblank, total_pixels, pixel_freq;
 332         int hsync, hfront_porch, vodd_front_porch_lines;
 333         unsigned int tmp1, tmp2;
 334
 335         drm_mode = drm_mode_create(dev);
 336         if (!drm_mode)
 337                 return NULL;
 338
 339         /* 1. In order to give correct results, the number of horizontal
 340          * pixels requested is first processed to ensure that it is divisible
 341          * by the character size, by rounding it to the nearest character
 342          * cell boundary:
 343          */
 344         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 345         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
 346
 347         /* 2. If interlace is requested, the number of vertical lines assumed
 348          * by the calculation must be halved, as the computation calculates
 349          * the number of vertical lines per field.
 350          */
 351         if (interlaced)
 352                 vdisplay_rnd = vdisplay / 2;
 353         else
 354                 vdisplay_rnd = vdisplay;
 355
 356         /* 3. Find the frame rate required: */
 357         if (interlaced)
 358                 vfieldrate_rqd = vrefresh * 2;
 359         else
 360                 vfieldrate_rqd = vrefresh;
 361
 362         /* 4. Find number of lines in Top margin: */
 363         top_margin = 0;
 364         if (margins)
 365                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 366                                 1000;
 367         /* 5. Find number of lines in bottom margin: */
 368         bottom_margin = top_margin;
 369
 370         /* 6. If interlace is required, then set variable interlace: */
 371         if (interlaced)
 372                 interlace = 1;
 373         else
 374                 interlace = 0;
 375
 376         /* 7. Estimate the Horizontal frequency */
 377         {
 378                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
 379                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
 380                                 2 + interlace;
 381                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
 382         }
 383
 384         /* 8. Find the number of lines in V sync + back porch */
 385         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
 386         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
 387         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
 388         /*  9. Find the number of lines in V back porch alone: */
 389         vback_porch = vsync_plus_bp - V_SYNC_RQD;
 390         /*  10. Find the total number of lines in Vertical field period: */
 391         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
 392                         vsync_plus_bp + GTF_MIN_V_PORCH;
 393         /*  11. Estimate the Vertical field frequency: */
 394         vfieldrate_est = hfreq_est / vtotal_lines;
 395         /*  12. Find the actual horizontal period: */
 396         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
 397
 398         /*  13. Find the actual Vertical field frequency: */
 399         vfield_rate = hfreq_est / vtotal_lines;
 400         /*  14. Find the Vertical frame frequency: */
 401         if (interlaced)
 402                 vframe_rate = vfield_rate / 2;
 403         else
 404                 vframe_rate = vfield_rate;
 405         /*  15. Find number of pixels in left margin: */
 406         if (margins)
 407                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 408                                 1000;
 409         else
 410                 left_margin = 0;
 411
 412         /* 16.Find number of pixels in right margin: */
 413         right_margin = left_margin;
 414         /* 17.Find total number of active pixels in image and left and right */
 415         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
 416         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
 417         ideal_duty_cycle = GTF_C_PRIME * 1000 -
 418                                 (GTF_M_PRIME * 1000000 / hfreq_est);
 419         /* 19.Find the number of pixels in the blanking time to the nearest
 420          * double character cell: */
 421         hblank = total_active_pixels * ideal_duty_cycle /
 422                         (100000 - ideal_duty_cycle);
 423         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
 424         hblank = hblank * 2 * GTF_CELL_GRAN;
 425         /* 20.Find total number of pixels: */
 426         total_pixels = total_active_pixels + hblank;
 427         /* 21.Find pixel clock frequency: */
 428         pixel_freq = total_pixels * hfreq_est / 1000;
 429         /* Stage 1 computations are now complete; I should really pass
 430          * the results to another function and do the Stage 2 computations,
 431          * but I only need a few more values so I'll just append the
 432          * computations here for now */
 433         /* 17. Find the number of pixels in the horizontal sync period: */
 434         hsync = H_SYNC_PERCENT * total_pixels / 100;
 435         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 436         hsync = hsync * GTF_CELL_GRAN;
 437         /* 18. Find the number of pixels in horizontal front porch period */
 438         hfront_porch = hblank / 2 - hsync;
 439         /*  36. Find the number of lines in the odd front porch period: */
 440         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
 441
 442         /* finally, pack the results in the mode struct */
 443         drm_mode->hdisplay = hdisplay_rnd;
 444         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
 445         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
 446         drm_mode->htotal = total_pixels;
 447         drm_mode->vdisplay = vdisplay_rnd;
 448         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
 449         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
 450         drm_mode->vtotal = vtotal_lines;
 451
 452         drm_mode->clock = pixel_freq;
 453
 454         if (interlaced) {
 455                 drm_mode->vtotal *= 2;
 456                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 457         }
 458
 459         drm_mode_set_name(drm_mode);
 460         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
 461                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
 462         else
 463                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 464
 465         return drm_mode;
 466 }
 467 EXPORT_SYMBOL(drm_gtf_mode_complex);
 468
 469 /**
 470  * drm_gtf_mode - create the modeline based on GTF algorithm
 471  *
 472  * @dev         :drm device
 473  * @hdisplay    :hdisplay size
 474  * @vdisplay    :vdisplay size
 475  * @vrefresh    :vrefresh rate.
 476  * @interlaced  :whether the interlace is supported
 477  * @margins     :whether the margin is supported
 478  *
 479  * LOCKING.
 480  * none.
 481  *
 482  * return the modeline based on GTF algorithm
 483  *
 484  * This function is to create the modeline based on the GTF algorithm.
 485  * Generalized Timing Formula is derived from:
 486  *      GTF Spreadsheet by Andy Morrish (1/5/97)
 487  *      available at http://www.vesa.org
 488  *
 489  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
 490  * What I have done is to translate it by using integer calculation.
 491  * I also refer to the function of fb_get_mode in the file of
 492  * drivers/video/fbmon.c
 493  *
 494  * Standard GTF parameters:
 495  * M = 600
 496  * C = 40
 497  * K = 128
 498  * J = 20
 499  */
 500 struct drm_display_mode *
 501 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
 502              bool lace, int margins)
 503 {
 504         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, lace,
 505                                     margins, 600, 40 * 2, 128, 20 * 2);
 506 }
 507 EXPORT_SYMBOL(drm_gtf_mode);
 508
 509 #ifdef CONFIG_VIDEOMODE_HELPERS
 510 int drm_display_mode_from_videomode(const struct videomode *vm,
 511                                     struct drm_display_mode *dmode)
 512 {
 513         dmode->hdisplay = vm->hactive;
 514         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
 515         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
 516         dmode->htotal = dmode->hsync_end + vm->hback_porch;
 517
 518         dmode->vdisplay = vm->vactive;
 519         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
 520         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
 521         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
 522
 523         dmode->clock = vm->pixelclock / 1000;
 524
 525         dmode->flags = 0;
 526         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 527                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
 528         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
 529                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
 530         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 531                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
 532         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
 533                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
 534         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
 535                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
 536         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
 537                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
 538         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 539                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 540         drm_mode_set_name(dmode);
 541
 542         return 0;
 543 }
 544 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
 545
 546 #ifdef CONFIG_OF
 547 /**
 548  * of_get_drm_display_mode - get a drm_display_mode from devicetree
 549  * @np: device_node with the timing specification
 550  * @dmode: will be set to the return value
 551  * @index: index into the list of display timings in devicetree
 552  *
 553  * This function is expensive and should only be used, if only one mode is to be
 554  * read from DT. To get multiple modes start with of_get_display_timings and
 555  * work with that instead.
 556  */
 557 int of_get_drm_display_mode(struct device_node *np,
 558                             struct drm_display_mode *dmode, int index)
 559 {
 560         struct videomode vm;
 561         int ret;
 562
 563         ret = of_get_videomode(np, &vm, index);
 564         if (ret)
 565                 return ret;
 566
 567         drm_display_mode_from_videomode(&vm, dmode);
 568
 569         pr_debug("%s: got %dx%d display mode from %s\n",
 570                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
 571         drm_mode_debug_printmodeline(dmode);
 572
 573         return 0;
 574 }
 575 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
 576 #endif /* CONFIG_OF */
 577 #endif /* CONFIG_VIDEOMODE_HELPERS */
 578
 579 /**
 580  * drm_mode_set_name - set the name on a mode
 581  * @mode: name will be set in this mode
 582  *
 583  * LOCKING:
 584  * None.
 585  *
 586  * Set the name of @mode to a standard format.
 587  */
 588 void drm_mode_set_name(struct drm_display_mode *mode)
 589 {
 590         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 591
 592         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
 593                  mode->hdisplay, mode->vdisplay,
 594                  interlaced ? "i" : "");
 595 }
 596 EXPORT_SYMBOL(drm_mode_set_name);
 597
 598 /**
 599  * drm_mode_width - get the width of a mode
 600  * @mode: mode
 601  *
 602  * LOCKING:
 603  * None.
 604  *
 605  * Return @mode's width (hdisplay) value.
 606  *
 607  * FIXME: is this needed?
 608  *
 609  * RETURNS:
 610  * @mode->hdisplay
 611  */
 612 int drm_mode_width(const struct drm_display_mode *mode)
 613 {
 614         return mode->hdisplay;
 615
 616 }
 617 EXPORT_SYMBOL(drm_mode_width);
 618
 619 /**
 620  * drm_mode_height - get the height of a mode
 621  * @mode: mode
 622  *
 623  * LOCKING:
 624  * None.
 625  *
 626  * Return @mode's height (vdisplay) value.
 627  *
 628  * FIXME: is this needed?
 629  *
 630  * RETURNS:
 631  * @mode->vdisplay
 632  */
 633 int drm_mode_height(const struct drm_display_mode *mode)
 634 {
 635         return mode->vdisplay;
 636 }
 637 EXPORT_SYMBOL(drm_mode_height);
 638
 639 /** drm_mode_hsync - get the hsync of a mode
 640  * @mode: mode
 641  *
 642  * LOCKING:
 643  * None.
 644  *
 645  * Return @modes's hsync rate in kHz, rounded to the nearest int.
 646  */
 647 int drm_mode_hsync(const struct drm_display_mode *mode)
 648 {
 649         unsigned int calc_val;
 650
 651         if (mode->hsync)
 652                 return mode->hsync;
 653
 654         if (mode->htotal < 0)
 655                 return 0;
 656
 657         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
 658         calc_val += 500;                                /* round to 1000Hz */
 659         calc_val /= 1000;                               /* truncate to kHz */
 660
 661         return calc_val;
 662 }
 663 EXPORT_SYMBOL(drm_mode_hsync);
 664
 665 /**
 666  * drm_mode_vrefresh - get the vrefresh of a mode
 667  * @mode: mode
 668  *
 669  * LOCKING:
 670  * None.
 671  *
 672  * Return @mode's vrefresh rate in Hz or calculate it if necessary.
 673  *
 674  * FIXME: why is this needed?  shouldn't vrefresh be set already?
 675  *
 676  * RETURNS:
 677  * Vertical refresh rate. It will be the result of actual value plus 0.5.
 678  * If it is 70.288, it will return 70Hz.
 679  * If it is 59.6, it will return 60Hz.
 680  */
 681 int drm_mode_vrefresh(const struct drm_display_mode *mode)
 682 {
 683         int refresh = 0;
 684         unsigned int calc_val;
 685
 686         if (mode->vrefresh > 0)
 687                 refresh = mode->vrefresh;
 688         else if (mode->htotal > 0 && mode->vtotal > 0) {
 689                 int vtotal;
 690                 vtotal = mode->vtotal;
 691                 /* work out vrefresh the value will be x1000 */
 692                 calc_val = (mode->clock * 1000);
 693                 calc_val /= mode->htotal;
 694                 refresh = (calc_val + vtotal / 2) / vtotal;
 695
 696                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 697                         refresh *= 2;
 698                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 699                         refresh /= 2;
 700                 if (mode->vscan > 1)
 701                         refresh /= mode->vscan;
 702         }
 703         return refresh;
 704 }
 705 EXPORT_SYMBOL(drm_mode_vrefresh);
 706
 707 /**
 708  * drm_mode_set_crtcinfo - set CRTC modesetting parameters
 709  * @p: mode
 710  * @adjust_flags: a combination of adjustment flags
 711  *
 712  * LOCKING:
 713  * None.
 714  *
 715  * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
 716  *
 717  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
 718  *   interlaced modes.
 719  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
 720  *   buffers containing two eyes (only adjust the timings when needed, eg. for
 721  *   "frame packing" or "side by side full").
 722  */
 723 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
 724 {
 725         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
 726                 return;
 727
 728         p->crtc_clock = p->clock;
 729         p->crtc_hdisplay = p->hdisplay;
 730         p->crtc_hsync_start = p->hsync_start;
 731         p->crtc_hsync_end = p->hsync_end;
 732         p->crtc_htotal = p->htotal;
 733         p->crtc_hskew = p->hskew;
 734         p->crtc_vdisplay = p->vdisplay;
 735         p->crtc_vsync_start = p->vsync_start;
 736         p->crtc_vsync_end = p->vsync_end;
 737         p->crtc_vtotal = p->vtotal;
 738
 739         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
 740                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
 741                         p->crtc_vdisplay /= 2;
 742                         p->crtc_vsync_start /= 2;
 743                         p->crtc_vsync_end /= 2;
 744                         p->crtc_vtotal /= 2;
 745                 }
 746         }
 747
 748         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
 749                 p->crtc_vdisplay *= 2;
 750                 p->crtc_vsync_start *= 2;
 751                 p->crtc_vsync_end *= 2;
 752                 p->crtc_vtotal *= 2;
 753         }
 754
 755         if (p->vscan > 1) {
 756                 p->crtc_vdisplay *= p->vscan;
 757                 p->crtc_vsync_start *= p->vscan;
 758                 p->crtc_vsync_end *= p->vscan;
 759                 p->crtc_vtotal *= p->vscan;
 760         }
 761
 762         if (adjust_flags & CRTC_STEREO_DOUBLE) {
 763                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
 764
 765                 switch (layout) {
 766                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
 767                         p->crtc_clock *= 2;
 768                         p->crtc_vdisplay += p->crtc_vtotal;
 769                         p->crtc_vsync_start += p->crtc_vtotal;
 770                         p->crtc_vsync_end += p->crtc_vtotal;
 771                         p->crtc_vtotal += p->crtc_vtotal;
 772                         break;
 773                 }
 774         }
 775
 776         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
 777         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 778         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
 779         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
 780 }
 781 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 782
 783
 784 /**
 785  * drm_mode_copy - copy the mode
 786  * @dst: mode to overwrite
 787  * @src: mode to copy
 788  *
 789  * LOCKING:
 790  * None.
 791  *
 792  * Copy an existing mode into another mode, preserving the object id and
 793  * list head of the destination mode.
 794  */
 795 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
 796 {
 797         int id = dst->base.id;
 798         struct list_head head = dst->head;
 799
 800         *dst = *src;
 801         dst->base.id = id;
 802         dst->head = head;
 803 }
 804 EXPORT_SYMBOL(drm_mode_copy);
 805
 806 /**
 807  * drm_mode_duplicate - allocate and duplicate an existing mode
 808  * @m: mode to duplicate
 809  *
 810  * LOCKING:
 811  * None.
 812  *
 813  * Just allocate a new mode, copy the existing mode into it, and return
 814  * a pointer to it.  Used to create new instances of established modes.
 815  */
 816 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
 817                                             const struct drm_display_mode *mode)
 818 {
 819         struct drm_display_mode *nmode;
 820
 821         nmode = drm_mode_create(dev);
 822         if (!nmode)
 823                 return NULL;
 824
 825         drm_mode_copy(nmode, mode);
 826
 827         return nmode;
 828 }
 829 EXPORT_SYMBOL(drm_mode_duplicate);
 830
 831 /**
 832  * drm_mode_equal - test modes for equality
 833  * @mode1: first mode
 834  * @mode2: second mode
 835  *
 836  * LOCKING:
 837  * None.
 838  *
 839  * Check to see if @mode1 and @mode2 are equivalent.
 840  *
 841  * RETURNS:
 842  * True if the modes are equal, false otherwise.
 843  */
 844 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
 845 {
 846         /* do clock check convert to PICOS so fb modes get matched
 847          * the same */
 848         if (mode1->clock && mode2->clock) {
 849                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
 850                         return false;
 851         } else if (mode1->clock != mode2->clock)
 852                 return false;
 853
 854         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
 855             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
 856                 return false;
 857
 858         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
 859 }
 860 EXPORT_SYMBOL(drm_mode_equal);
 861
 862 /**
 863  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
 864  * @mode1: first mode
 865  * @mode2: second mode
 866  *
 867  * LOCKING:
 868  * None.
 869  *
 870  * Check to see if @mode1 and @mode2 are equivalent, but
 871  * don't check the pixel clocks nor the stereo layout.
 872  *
 873  * RETURNS:
 874  * True if the modes are equal, false otherwise.
 875  */
 876 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 877                                         const struct drm_display_mode *mode2)
 878 {
 879         if (mode1->hdisplay == mode2->hdisplay &&
 880             mode1->hsync_start == mode2->hsync_start &&
 881             mode1->hsync_end == mode2->hsync_end &&
 882             mode1->htotal == mode2->htotal &&
 883             mode1->hskew == mode2->hskew &&
 884             mode1->vdisplay == mode2->vdisplay &&
 885             mode1->vsync_start == mode2->vsync_start &&
 886             mode1->vsync_end == mode2->vsync_end &&
 887             mode1->vtotal == mode2->vtotal &&
 888             mode1->vscan == mode2->vscan &&
 889             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
 890              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
 891                 return true;
 892
 893         return false;
 894 }
 895 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
 896
 897 /**
 898  * drm_mode_validate_size - make sure modes adhere to size constraints
 899  * @dev: DRM device
 900  * @mode_list: list of modes to check
 901  * @maxX: maximum width
 902  * @maxY: maximum height
 903  * @maxPitch: max pitch
 904  *
 905  * LOCKING:
 906  * Caller must hold a lock protecting @mode_list.
 907  *
 908  * The DRM device (@dev) has size and pitch limits.  Here we validate the
 909  * modes we probed for @dev against those limits and set their status as
 910  * necessary.
 911  */
 912 void drm_mode_validate_size(struct drm_device *dev,
 913                             struct list_head *mode_list,
 914                             int maxX, int maxY, int maxPitch)
 915 {
 916         struct drm_display_mode *mode;
 917
 918         list_for_each_entry(mode, mode_list, head) {
 919                 if (maxPitch > 0 && mode->hdisplay > maxPitch)
 920                         mode->status = MODE_BAD_WIDTH;
 921
 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  * LOCKING:
 938  * Caller must hold a lock protecting @mode_list.
 939  *
 940  * Once mode list generation is complete, a caller can use this routine to
 941  * remove invalid modes from a mode list.  If any of the modes have a
 942  * status other than %MODE_OK, they are removed from @mode_list and freed.
 943  */
 944 void drm_mode_prune_invalid(struct drm_device *dev,
 945                             struct list_head *mode_list, bool verbose)
 946 {
 947         struct drm_display_mode *mode, *t;
 948
 949         list_for_each_entry_safe(mode, t, mode_list, head) {
 950                 if (mode->status != MODE_OK) {
 951                         list_del(&mode->head);
 952                         if (verbose) {
 953                                 drm_mode_debug_printmodeline(mode);
 954                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
 955                                         mode->name, mode->status);
 956                         }
 957                         drm_mode_destroy(dev, mode);
 958                 }
 959         }
 960 }
 961 EXPORT_SYMBOL(drm_mode_prune_invalid);
 962
 963 /**
 964  * drm_mode_compare - compare modes for favorability
 965  * @priv: unused
 966  * @lh_a: list_head for first mode
 967  * @lh_b: list_head for second mode
 968  *
 969  * LOCKING:
 970  * None.
 971  *
 972  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
 973  * which is better.
 974  *
 975  * RETURNS:
 976  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
 977  * positive if @lh_b is better than @lh_a.
 978  */
 979 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
 980 {
 981         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
 982         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
 983         int diff;
 984
 985         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
 986                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
 987         if (diff)
 988                 return diff;
 989         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
 990         if (diff)
 991                 return diff;
 992
 993         diff = b->vrefresh - a->vrefresh;
 994         if (diff)
 995                 return diff;
 996
 997         diff = b->clock - a->clock;
 998         return diff;
 999 }
1000
1001 /**
1002  * drm_mode_sort - sort mode list
1003  * @mode_list: list to sort
1004  *
1005  * LOCKING:
1006  * Caller must hold a lock protecting @mode_list.
1007  *
1008  * Sort @mode_list by favorability, putting good modes first.
1009  */
1010 void drm_mode_sort(struct list_head *mode_list)
1011 {
1012         list_sort(NULL, mode_list, drm_mode_compare);
1013 }
1014 EXPORT_SYMBOL(drm_mode_sort);
1015
1016 /**
1017  * drm_mode_connector_list_update - update the mode list for the connector
1018  * @connector: the connector to update
1019  *
1020  * LOCKING:
1021  * Caller must hold a lock protecting @mode_list.
1022  *
1023  * This moves the modes from the @connector probed_modes list
1024  * to the actual mode list. It compares the probed mode against the current
1025  * list and only adds different modes. All modes unverified after this point
1026  * will be removed by the prune invalid modes.
1027  */
1028 void drm_mode_connector_list_update(struct drm_connector *connector)
1029 {
1030         struct drm_display_mode *mode;
1031         struct drm_display_mode *pmode, *pt;
1032         int found_it;
1033
1034         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1035                                  head) {
1036                 found_it = 0;
1037                 /* go through current modes checking for the new probed mode */
1038                 list_for_each_entry(mode, &connector->modes, head) {
1039                         if (drm_mode_equal(pmode, mode)) {
1040                                 found_it = 1;
1041                                 /* if equal delete the probed mode */
1042                                 mode->status = pmode->status;
1043                                 /* Merge type bits together */
1044                                 mode->type |= pmode->type;
1045                                 list_del(&pmode->head);
1046                                 drm_mode_destroy(connector->dev, pmode);
1047                                 break;
1048                         }
1049                 }
1050
1051                 if (!found_it) {
1052                         list_move_tail(&pmode->head, &connector->modes);
1053                 }
1054         }
1055 }
1056 EXPORT_SYMBOL(drm_mode_connector_list_update);
1057
1058 /**
1059  * drm_mode_parse_command_line_for_connector - parse command line for connector
1060  * @mode_option - per connector mode option
1061  * @connector - connector to parse line for
1062  *
1063  * This parses the connector specific then generic command lines for
1064  * modes and options to configure the connector.
1065  *
1066  * This uses the same parameters as the fb modedb.c, except for extra
1067  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1068  *
1069  * enable/enable Digital/disable bit at the end
1070  */
1071 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1072                                                struct drm_connector *connector,
1073                                                struct drm_cmdline_mode *mode)
1074 {
1075         const char *name;
1076         unsigned int namelen;
1077         bool res_specified = false, bpp_specified = false, refresh_specified = false;
1078         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1079         bool yres_specified = false, cvt = false, rb = false;
1080         bool interlace = false, margins = false, was_digit = false;
1081         int i;
1082         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1083
1084 #ifdef CONFIG_FB
1085         if (!mode_option)
1086                 mode_option = fb_mode_option;
1087 #endif
1088
1089         if (!mode_option) {
1090                 mode->specified = false;
1091                 return false;
1092         }
1093
1094         name = mode_option;
1095         namelen = strlen(name);
1096         for (i = namelen-1; i >= 0; i--) {
1097                 switch (name[i]) {
1098                 case '@':
1099                         if (!refresh_specified && !bpp_specified &&
1100                             !yres_specified && !cvt && !rb && was_digit) {
1101                                 refresh = simple_strtol(&name[i+1], NULL, 10);
1102                                 refresh_specified = true;
1103                                 was_digit = false;
1104                         } else
1105                                 goto done;
1106                         break;
1107                 case '-':
1108                         if (!bpp_specified && !yres_specified && !cvt &&
1109                             !rb && was_digit) {
1110                                 bpp = simple_strtol(&name[i+1], NULL, 10);
1111                                 bpp_specified = true;
1112                                 was_digit = false;
1113                         } else
1114                                 goto done;
1115                         break;
1116                 case 'x':
1117                         if (!yres_specified && was_digit) {
1118                                 yres = simple_strtol(&name[i+1], NULL, 10);
1119                                 yres_specified = true;
1120                                 was_digit = false;
1121                         } else
1122                                 goto done;
1123                         break;
1124                 case '0' ... '9':
1125                         was_digit = true;
1126                         break;
1127                 case 'M':
1128                         if (yres_specified || cvt || was_digit)
1129                                 goto done;
1130                         cvt = true;
1131                         break;
1132                 case 'R':
1133                         if (yres_specified || cvt || rb || was_digit)
1134                                 goto done;
1135                         rb = true;
1136                         break;
1137                 case 'm':
1138                         if (cvt || yres_specified || was_digit)
1139                                 goto done;
1140                         margins = true;
1141                         break;
1142                 case 'i':
1143                         if (cvt || yres_specified || was_digit)
1144                                 goto done;
1145                         interlace = true;
1146                         break;
1147                 case 'e':
1148                         if (yres_specified || bpp_specified || refresh_specified ||
1149                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1150                                 goto done;
1151
1152                         force = DRM_FORCE_ON;
1153                         break;
1154                 case 'D':
1155                         if (yres_specified || bpp_specified || refresh_specified ||
1156                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1157                                 goto done;
1158
1159                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1160                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1161                                 force = DRM_FORCE_ON;
1162                         else
1163                                 force = DRM_FORCE_ON_DIGITAL;
1164                         break;
1165                 case 'd':
1166                         if (yres_specified || bpp_specified || refresh_specified ||
1167                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1168                                 goto done;
1169
1170                         force = DRM_FORCE_OFF;
1171                         break;
1172                 default:
1173                         goto done;
1174                 }
1175         }
1176
1177         if (i < 0 && yres_specified) {
1178                 char *ch;
1179                 xres = simple_strtol(name, &ch, 10);
1180                 if ((ch != NULL) && (*ch == 'x'))
1181                         res_specified = true;
1182                 else
1183                         i = ch - name;
1184         } else if (!yres_specified && was_digit) {
1185                 /* catch mode that begins with digits but has no 'x' */
1186                 i = 0;
1187         }
1188 done:
1189         if (i >= 0) {
1190                 printk(KERN_WARNING
1191                         "parse error at position %i in video mode '%s'\n",
1192                         i, name);
1193                 mode->specified = false;
1194                 return false;
1195         }
1196
1197         if (res_specified) {
1198                 mode->specified = true;
1199                 mode->xres = xres;
1200                 mode->yres = yres;
1201         }
1202
1203         if (refresh_specified) {
1204                 mode->refresh_specified = true;
1205                 mode->refresh = refresh;
1206         }
1207
1208         if (bpp_specified) {
1209                 mode->bpp_specified = true;
1210                 mode->bpp = bpp;
1211         }
1212         mode->rb = rb;
1213         mode->cvt = cvt;
1214         mode->interlace = interlace;
1215         mode->margins = margins;
1216         mode->force = force;
1217
1218         return true;
1219 }
1220 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1221
1222 struct drm_display_mode *
1223 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1224                                   struct drm_cmdline_mode *cmd)
1225 {
1226         struct drm_display_mode *mode;
1227
1228         if (cmd->cvt)
1229                 mode = drm_cvt_mode(dev,
1230                                     cmd->xres, cmd->yres,
1231                                     cmd->refresh_specified ? cmd->refresh : 60,
1232                                     cmd->rb, cmd->interlace,
1233                                     cmd->margins);
1234         else
1235                 mode = drm_gtf_mode(dev,
1236                                     cmd->xres, cmd->yres,
1237                                     cmd->refresh_specified ? cmd->refresh : 60,
1238                                     cmd->interlace,
1239                                     cmd->margins);
1240         if (!mode)
1241                 return NULL;
1242
1243         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1244         return mode;
1245 }
1246 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);