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