sys/dev/drm/drm_modes.c

   1 /*
   2  * Copyright © 1997-2003 by The XFree86 Project, Inc.
   3  * Copyright © 2007 Dave Airlie
   4  * Copyright © 2007-2008 Intel Corporation
   5  *   Jesse Barnes <jesse.barnes@intel.com>
   6  * Copyright 2005-2006 Luc Verhaegen
   7  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Except as contained in this notice, the name of the copyright holder(s)
  28  * and author(s) shall not be used in advertising or otherwise to promote
  29  * the sale, use or other dealings in this Software without prior written
  30  * authorization from the copyright holder(s) and author(s).
  31  */
  32
  33 #include <linux/list.h>
  34 #include <linux/list_sort.h>
  35 #include <linux/export.h>
  36 #include <drm/drmP.h>
  37 #include <drm/drm_crtc.h>
  38 #include <video/videomode.h>
  39 #include <drm/drm_modes.h>
  40
  41 #include "drm_crtc_internal.h"
  42
  43 /**
  44  * drm_mode_debug_printmodeline - print a mode to dmesg
  45  * @mode: mode to print
  46  *
  47  * Describe @mode using DRM_DEBUG.
  48  */
  49 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  50 {
  51         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  52                         "0x%x 0x%x\n",
  53                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  54                 mode->hdisplay, mode->hsync_start,
  55                 mode->hsync_end, mode->htotal,
  56                 mode->vdisplay, mode->vsync_start,
  57                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  58 }
  59 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  60
  61 /**
  62  * drm_mode_create - create a new display mode
  63  * @dev: DRM device
  64  *
  65  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
  66  * and return it.
  67  *
  68  * Returns:
  69  * Pointer to new mode on success, NULL on error.
  70  */
  71 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
  72 {
  73         struct drm_display_mode *nmode;
  74
  75         nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
  76         if (!nmode)
  77                 return NULL;
  78
  79         if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
  80                 kfree(nmode);
  81                 return NULL;
  82         }
  83
  84         return nmode;
  85 }
  86 EXPORT_SYMBOL(drm_mode_create);
  87
  88 /**
  89  * drm_mode_destroy - remove a mode
  90  * @dev: DRM device
  91  * @mode: mode to remove
  92  *
  93  * Release @mode's unique ID, then free it @mode structure itself using kfree.
  94  */
  95 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
  96 {
  97         if (!mode)
  98                 return;
  99
 100         drm_mode_object_put(dev, &mode->base);
 101
 102         kfree(mode);
 103 }
 104 EXPORT_SYMBOL(drm_mode_destroy);
 105
 106 /**
 107  * drm_mode_probed_add - add a mode to a connector's probed_mode list
 108  * @connector: connector the new mode
 109  * @mode: mode data
 110  *
 111  * Add @mode to @connector's probed_mode list for later use. This list should
 112  * then in a second step get filtered and all the modes actually supported by
 113  * the hardware moved to the @connector's modes list.
 114  */
 115 void drm_mode_probed_add(struct drm_connector *connector,
 116                          struct drm_display_mode *mode)
 117 {
 118         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
 119
 120         list_add_tail(&mode->head, &connector->probed_modes);
 121 }
 122 EXPORT_SYMBOL(drm_mode_probed_add);
 123
 124 /**
 125  * drm_cvt_mode -create a modeline based on the CVT algorithm
 126  * @dev: drm device
 127  * @hdisplay: hdisplay size
 128  * @vdisplay: vdisplay size
 129  * @vrefresh: vrefresh rate
 130  * @reduced: whether to use reduced blanking
 131  * @interlaced: whether to compute an interlaced mode
 132  * @margins: whether to add margins (borders)
 133  *
 134  * This function is called to generate the modeline based on CVT algorithm
 135  * according to the hdisplay, vdisplay, vrefresh.
 136  * It is based from the VESA(TM) Coordinated Video Timing Generator by
 137  * Graham Loveridge April 9, 2003 available at
 138  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
 139  *
 140  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
 141  * What I have done is to translate it by using integer calculation.
 142  *
 143  * Returns:
 144  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
 145  * The display mode object is allocated with drm_mode_create(). Returns NULL
 146  * when no mode could be allocated.
 147  */
 148 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
 149                                       int vdisplay, int vrefresh,
 150                                       bool reduced, bool interlaced, bool margins)
 151 {
 152 #define HV_FACTOR                       1000
 153         /* 1) top/bottom margin size (% of height) - default: 1.8, */
 154 #define CVT_MARGIN_PERCENTAGE           18
 155         /* 2) character cell horizontal granularity (pixels) - default 8 */
 156 #define CVT_H_GRANULARITY               8
 157         /* 3) Minimum vertical porch (lines) - default 3 */
 158 #define CVT_MIN_V_PORCH                 3
 159         /* 4) Minimum number of vertical back porch lines - default 6 */
 160 #define CVT_MIN_V_BPORCH                6
 161         /* Pixel Clock step (kHz) */
 162 #define CVT_CLOCK_STEP                  250
 163         struct drm_display_mode *drm_mode;
 164         unsigned int vfieldrate, hperiod;
 165         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
 166         int interlace;
 167
 168         /* allocate the drm_display_mode structure. If failure, we will
 169          * return directly
 170          */
 171         drm_mode = drm_mode_create(dev);
 172         if (!drm_mode)
 173                 return NULL;
 174
 175         /* the CVT default refresh rate is 60Hz */
 176         if (!vrefresh)
 177                 vrefresh = 60;
 178
 179         /* the required field fresh rate */
 180         if (interlaced)
 181                 vfieldrate = vrefresh * 2;
 182         else
 183                 vfieldrate = vrefresh;
 184
 185         /* horizontal pixels */
 186         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
 187
 188         /* determine the left&right borders */
 189         hmargin = 0;
 190         if (margins) {
 191                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 192                 hmargin -= hmargin % CVT_H_GRANULARITY;
 193         }
 194         /* find the total active pixels */
 195         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
 196
 197         /* find the number of lines per field */
 198         if (interlaced)
 199                 vdisplay_rnd = vdisplay / 2;
 200         else
 201                 vdisplay_rnd = vdisplay;
 202
 203         /* find the top & bottom borders */
 204         vmargin = 0;
 205         if (margins)
 206                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
 207
 208         drm_mode->vdisplay = vdisplay + 2 * vmargin;
 209
 210         /* Interlaced */
 211         if (interlaced)
 212                 interlace = 1;
 213         else
 214                 interlace = 0;
 215
 216         /* Determine VSync Width from aspect ratio */
 217         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
 218                 vsync = 4;
 219         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
 220                 vsync = 5;
 221         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
 222                 vsync = 6;
 223         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
 224                 vsync = 7;
 225         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
 226                 vsync = 7;
 227         else /* custom */
 228                 vsync = 10;
 229
 230         if (!reduced) {
 231                 /* simplify the GTF calculation */
 232                 /* 4) Minimum time of vertical sync + back porch interval (µs)
 233                  * default 550.0
 234                  */
 235                 int tmp1, tmp2;
 236 #define CVT_MIN_VSYNC_BP        550
 237                 /* 3) Nominal HSync width (% of line period) - default 8 */
 238 #define CVT_HSYNC_PERCENTAGE    8
 239                 unsigned int hblank_percentage;
 240                 int vsyncandback_porch, vback_porch, hblank;
 241
 242                 /* estimated the horizontal period */
 243                 tmp1 = HV_FACTOR * 1000000  -
 244                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
 245                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
 246                                 interlace;
 247                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
 248
 249                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
 250                 /* 9. Find number of lines in sync + backporch */
 251                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
 252                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
 253                 else
 254                         vsyncandback_porch = tmp1;
 255                 /* 10. Find number of lines in back porch */
 256                 vback_porch = vsyncandback_porch - vsync;
 257                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
 258                                 vsyncandback_porch + CVT_MIN_V_PORCH;
 259                 /* 5) Definition of Horizontal blanking time limitation */
 260                 /* Gradient (%/kHz) - default 600 */
 261 #define CVT_M_FACTOR    600
 262                 /* Offset (%) - default 40 */
 263 #define CVT_C_FACTOR    40
 264                 /* Blanking time scaling factor - default 128 */
 265 #define CVT_K_FACTOR    128
 266                 /* Scaling factor weighting - default 20 */
 267 #define CVT_J_FACTOR    20
 268 #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
 269 #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
 270                          CVT_J_FACTOR)
 271                 /* 12. Find ideal blanking duty cycle from formula */
 272                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
 273                                         hperiod / 1000;
 274                 /* 13. Blanking time */
 275                 if (hblank_percentage < 20 * HV_FACTOR)
 276                         hblank_percentage = 20 * HV_FACTOR;
 277                 hblank = drm_mode->hdisplay * hblank_percentage /
 278                          (100 * HV_FACTOR - hblank_percentage);
 279                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
 280                 /* 14. find the total pixels per line */
 281                 drm_mode->htotal = drm_mode->hdisplay + hblank;
 282                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
 283                 drm_mode->hsync_start = drm_mode->hsync_end -
 284                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
 285                 drm_mode->hsync_start += CVT_H_GRANULARITY -
 286                         drm_mode->hsync_start % CVT_H_GRANULARITY;
 287                 /* fill the Vsync values */
 288                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
 289                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 290         } else {
 291                 /* Reduced blanking */
 292                 /* Minimum vertical blanking interval time (µs)- default 460 */
 293 #define CVT_RB_MIN_VBLANK       460
 294                 /* Fixed number of clocks for horizontal sync */
 295 #define CVT_RB_H_SYNC           32
 296                 /* Fixed number of clocks for horizontal blanking */
 297 #define CVT_RB_H_BLANK          160
 298                 /* Fixed number of lines for vertical front porch - default 3*/
 299 #define CVT_RB_VFPORCH          3
 300                 int vbilines;
 301                 int tmp1, tmp2;
 302                 /* 8. Estimate Horizontal period. */
 303                 tmp1 = HV_FACTOR * 1000000 -
 304                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
 305                 tmp2 = vdisplay_rnd + 2 * vmargin;
 306                 hperiod = tmp1 / (tmp2 * vfieldrate);
 307                 /* 9. Find number of lines in vertical blanking */
 308                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
 309                 /* 10. Check if vertical blanking is sufficient */
 310                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
 311                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
 312                 /* 11. Find total number of lines in vertical field */
 313                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
 314                 /* 12. Find total number of pixels in a line */
 315                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
 316                 /* Fill in HSync values */
 317                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
 318                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
 319                 /* Fill in VSync values */
 320                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
 321                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
 322         }
 323         /* 15/13. Find pixel clock frequency (kHz for xf86) */
 324         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
 325         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
 326         /* 18/16. Find actual vertical frame frequency */
 327         /* ignore - just set the mode flag for interlaced */
 328         if (interlaced) {
 329                 drm_mode->vtotal *= 2;
 330                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 331         }
 332         /* Fill the mode line name */
 333         drm_mode_set_name(drm_mode);
 334         if (reduced)
 335                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
 336                                         DRM_MODE_FLAG_NVSYNC);
 337         else
 338                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
 339                                         DRM_MODE_FLAG_NHSYNC);
 340
 341         return drm_mode;
 342 }
 343 EXPORT_SYMBOL(drm_cvt_mode);
 344
 345 /**
 346  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
 347  * @dev: drm device
 348  * @hdisplay: hdisplay size
 349  * @vdisplay: vdisplay size
 350  * @vrefresh: vrefresh rate.
 351  * @interlaced: whether to compute an interlaced mode
 352  * @margins: desired margin (borders) size
 353  * @GTF_M: extended GTF formula parameters
 354  * @GTF_2C: extended GTF formula parameters
 355  * @GTF_K: extended GTF formula parameters
 356  * @GTF_2J: extended GTF formula parameters
 357  *
 358  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
 359  * in here multiplied by two.  For a C of 40, pass in 80.
 360  *
 361  * Returns:
 362  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
 363  * The display mode object is allocated with drm_mode_create(). Returns NULL
 364  * when no mode could be allocated.
 365  */
 366 struct drm_display_mode *
 367 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
 368                      int vrefresh, bool interlaced, int margins,
 369                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
 370 {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
 371 #define GTF_MARGIN_PERCENTAGE           18
 372         /* 2) character cell horizontal granularity (pixels) - default 8 */
 373 #define GTF_CELL_GRAN                   8
 374         /* 3) Minimum vertical porch (lines) - default 3 */
 375 #define GTF_MIN_V_PORCH                 1
 376         /* width of vsync in lines */
 377 #define V_SYNC_RQD                      3
 378         /* width of hsync as % of total line */
 379 #define H_SYNC_PERCENT                  8
 380         /* min time of vsync + back porch (microsec) */
 381 #define MIN_VSYNC_PLUS_BP               550
 382         /* C' and M' are part of the Blanking Duty Cycle computation */
 383 #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
 384 #define GTF_M_PRIME     (GTF_K * GTF_M / 256)
 385         struct drm_display_mode *drm_mode;
 386         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
 387         int top_margin, bottom_margin;
 388         int interlace;
 389         unsigned int hfreq_est;
 390         int vsync_plus_bp, vback_porch;
 391         unsigned int vtotal_lines, vfieldrate_est, hperiod;
 392         unsigned int vfield_rate, vframe_rate;
 393         int left_margin, right_margin;
 394         unsigned int total_active_pixels, ideal_duty_cycle;
 395         unsigned int hblank, total_pixels, pixel_freq;
 396         int hsync, hfront_porch, vodd_front_porch_lines;
 397         unsigned int tmp1, tmp2;
 398
 399         drm_mode = drm_mode_create(dev);
 400         if (!drm_mode)
 401                 return NULL;
 402
 403         /* 1. In order to give correct results, the number of horizontal
 404          * pixels requested is first processed to ensure that it is divisible
 405          * by the character size, by rounding it to the nearest character
 406          * cell boundary:
 407          */
 408         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 409         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
 410
 411         /* 2. If interlace is requested, the number of vertical lines assumed
 412          * by the calculation must be halved, as the computation calculates
 413          * the number of vertical lines per field.
 414          */
 415         if (interlaced)
 416                 vdisplay_rnd = vdisplay / 2;
 417         else
 418                 vdisplay_rnd = vdisplay;
 419
 420         /* 3. Find the frame rate required: */
 421         if (interlaced)
 422                 vfieldrate_rqd = vrefresh * 2;
 423         else
 424                 vfieldrate_rqd = vrefresh;
 425
 426         /* 4. Find number of lines in Top margin: */
 427         top_margin = 0;
 428         if (margins)
 429                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 430                                 1000;
 431         /* 5. Find number of lines in bottom margin: */
 432         bottom_margin = top_margin;
 433
 434         /* 6. If interlace is required, then set variable interlace: */
 435         if (interlaced)
 436                 interlace = 1;
 437         else
 438                 interlace = 0;
 439
 440         /* 7. Estimate the Horizontal frequency */
 441         {
 442                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
 443                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
 444                                 2 + interlace;
 445                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
 446         }
 447
 448         /* 8. Find the number of lines in V sync + back porch */
 449         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
 450         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
 451         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
 452         /*  9. Find the number of lines in V back porch alone: */
 453         vback_porch = vsync_plus_bp - V_SYNC_RQD;
 454         /*  10. Find the total number of lines in Vertical field period: */
 455         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
 456                         vsync_plus_bp + GTF_MIN_V_PORCH;
 457         /*  11. Estimate the Vertical field frequency: */
 458         vfieldrate_est = hfreq_est / vtotal_lines;
 459         /*  12. Find the actual horizontal period: */
 460         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
 461
 462         /*  13. Find the actual Vertical field frequency: */
 463         vfield_rate = hfreq_est / vtotal_lines;
 464         /*  14. Find the Vertical frame frequency: */
 465         if (interlaced)
 466                 vframe_rate = vfield_rate / 2;
 467         else
 468                 vframe_rate = vfield_rate;
 469         /*  15. Find number of pixels in left margin: */
 470         if (margins)
 471                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
 472                                 1000;
 473         else
 474                 left_margin = 0;
 475
 476         /* 16.Find number of pixels in right margin: */
 477         right_margin = left_margin;
 478         /* 17.Find total number of active pixels in image and left and right */
 479         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
 480         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
 481         ideal_duty_cycle = GTF_C_PRIME * 1000 -
 482                                 (GTF_M_PRIME * 1000000 / hfreq_est);
 483         /* 19.Find the number of pixels in the blanking time to the nearest
 484          * double character cell: */
 485         hblank = total_active_pixels * ideal_duty_cycle /
 486                         (100000 - ideal_duty_cycle);
 487         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
 488         hblank = hblank * 2 * GTF_CELL_GRAN;
 489         /* 20.Find total number of pixels: */
 490         total_pixels = total_active_pixels + hblank;
 491         /* 21.Find pixel clock frequency: */
 492         pixel_freq = total_pixels * hfreq_est / 1000;
 493         /* Stage 1 computations are now complete; I should really pass
 494          * the results to another function and do the Stage 2 computations,
 495          * but I only need a few more values so I'll just append the
 496          * computations here for now */
 497         /* 17. Find the number of pixels in the horizontal sync period: */
 498         hsync = H_SYNC_PERCENT * total_pixels / 100;
 499         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
 500         hsync = hsync * GTF_CELL_GRAN;
 501         /* 18. Find the number of pixels in horizontal front porch period */
 502         hfront_porch = hblank / 2 - hsync;
 503         /*  36. Find the number of lines in the odd front porch period: */
 504         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
 505
 506         /* finally, pack the results in the mode struct */
 507         drm_mode->hdisplay = hdisplay_rnd;
 508         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
 509         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
 510         drm_mode->htotal = total_pixels;
 511         drm_mode->vdisplay = vdisplay_rnd;
 512         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
 513         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
 514         drm_mode->vtotal = vtotal_lines;
 515
 516         drm_mode->clock = pixel_freq;
 517
 518         if (interlaced) {
 519                 drm_mode->vtotal *= 2;
 520                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
 521         }
 522
 523         drm_mode_set_name(drm_mode);
 524         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
 525                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
 526         else
 527                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 528
 529         return drm_mode;
 530 }
 531 EXPORT_SYMBOL(drm_gtf_mode_complex);
 532
 533 /**
 534  * drm_gtf_mode - create the modeline based on the GTF algorithm
 535  * @dev: drm device
 536  * @hdisplay: hdisplay size
 537  * @vdisplay: vdisplay size
 538  * @vrefresh: vrefresh rate.
 539  * @interlaced: whether to compute an interlaced mode
 540  * @margins: desired margin (borders) size
 541  *
 542  * return the modeline based on GTF algorithm
 543  *
 544  * This function is to create the modeline based on the GTF algorithm.
 545  * Generalized Timing Formula is derived from:
 546  *      GTF Spreadsheet by Andy Morrish (1/5/97)
 547  *      available at http://www.vesa.org
 548  *
 549  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
 550  * What I have done is to translate it by using integer calculation.
 551  * I also refer to the function of fb_get_mode in the file of
 552  * drivers/video/fbmon.c
 553  *
 554  * Standard GTF parameters:
 555  * M = 600
 556  * C = 40
 557  * K = 128
 558  * J = 20
 559  *
 560  * Returns:
 561  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
 562  * The display mode object is allocated with drm_mode_create(). Returns NULL
 563  * when no mode could be allocated.
 564  */
 565 struct drm_display_mode *
 566 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
 567              bool interlaced, int margins)
 568 {
 569         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
 570                                     interlaced, margins,
 571                                     600, 40 * 2, 128, 20 * 2);
 572 }
 573 EXPORT_SYMBOL(drm_gtf_mode);
 574
 575 #ifdef CONFIG_VIDEOMODE_HELPERS
 576 /**
 577  * drm_display_mode_from_videomode - fill in @dmode using @vm,
 578  * @vm: videomode structure to use as source
 579  * @dmode: drm_display_mode structure to use as destination
 580  *
 581  * Fills out @dmode using the display mode specified in @vm.
 582  */
 583 void drm_display_mode_from_videomode(const struct videomode *vm,
 584                                      struct drm_display_mode *dmode)
 585 {
 586         dmode->hdisplay = vm->hactive;
 587         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
 588         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
 589         dmode->htotal = dmode->hsync_end + vm->hback_porch;
 590
 591         dmode->vdisplay = vm->vactive;
 592         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
 593         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
 594         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
 595
 596         dmode->clock = vm->pixelclock / 1000;
 597
 598         dmode->flags = 0;
 599         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 600                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
 601         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
 602                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
 603         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 604                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
 605         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
 606                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
 607         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
 608                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
 609         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
 610                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
 611         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 612                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 613         drm_mode_set_name(dmode);
 614 }
 615
 616 /**
 617  * drm_display_mode_to_videomode - fill in @vm using @dmode,
 618  * @dmode: drm_display_mode structure to use as source
 619  * @vm: videomode structure to use as destination
 620  *
 621  * Fills out @vm using the display mode specified in @dmode.
 622  */
 623 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 624                                    struct videomode *vm)
 625 {
 626         vm->hactive = dmode->hdisplay;
 627         vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
 628         vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
 629         vm->hback_porch = dmode->htotal - dmode->hsync_end;
 630
 631         vm->vactive = dmode->vdisplay;
 632         vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
 633         vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
 634         vm->vback_porch = dmode->vtotal - dmode->vsync_end;
 635
 636         vm->pixelclock = dmode->clock * 1000;
 637
 638         vm->flags = 0;
 639         if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
 640                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 641         else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
 642                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
 643         if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
 644                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
 645         else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
 646                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
 647         if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
 648                 vm->flags |= DISPLAY_FLAGS_INTERLACED;
 649         if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
 650                 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
 651         if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
 652                 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
 653 }
 654
 655 #ifdef CONFIG_OF
 656 /**
 657  * of_get_drm_display_mode - get a drm_display_mode from devicetree
 658  * @np: device_node with the timing specification
 659  * @dmode: will be set to the return value
 660  * @index: index into the list of display timings in devicetree
 661  *
 662  * This function is expensive and should only be used, if only one mode is to be
 663  * read from DT. To get multiple modes start with of_get_display_timings and
 664  * work with that instead.
 665  *
 666  * Returns:
 667  * 0 on success, a negative errno code when no of videomode node was found.
 668  */
 669 int of_get_drm_display_mode(struct device_node *np,
 670                             struct drm_display_mode *dmode, int index)
 671 {
 672         struct videomode vm;
 673         int ret;
 674
 675         ret = of_get_videomode(np, &vm, index);
 676         if (ret)
 677                 return ret;
 678
 679         drm_display_mode_from_videomode(&vm, dmode);
 680
 681         pr_debug("%s: got %dx%d display mode from %s\n",
 682                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
 683         drm_mode_debug_printmodeline(dmode);
 684
 685         return 0;
 686 }
 687 #endif /* CONFIG_OF */
 688 #endif /* CONFIG_VIDEOMODE_HELPERS */
 689
 690 /**
 691  * drm_mode_set_name - set the name on a mode
 692  * @mode: name will be set in this mode
 693  *
 694  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
 695  * with an optional 'i' suffix for interlaced modes.
 696  */
 697 void drm_mode_set_name(struct drm_display_mode *mode)
 698 {
 699         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 700
 701         ksnprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
 702                  mode->hdisplay, mode->vdisplay,
 703                  interlaced ? "i" : "");
 704 }
 705 EXPORT_SYMBOL(drm_mode_set_name);
 706
 707 /** drm_mode_hsync - get the hsync of a mode
 708  * @mode: mode
 709  *
 710  * Returns:
 711  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
 712  * value first if it is not yet set.
 713  */
 714 int drm_mode_hsync(const struct drm_display_mode *mode)
 715 {
 716         unsigned int calc_val;
 717
 718         if (mode->hsync)
 719                 return mode->hsync;
 720
 721         if (mode->htotal < 0)
 722                 return 0;
 723
 724         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
 725         calc_val += 500;                                /* round to 1000Hz */
 726         calc_val /= 1000;                               /* truncate to kHz */
 727
 728         return calc_val;
 729 }
 730 EXPORT_SYMBOL(drm_mode_hsync);
 731
 732 /**
 733  * drm_mode_vrefresh - get the vrefresh of a mode
 734  * @mode: mode
 735  *
 736  * Returns:
 737  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
 738  * value first if it is not yet set.
 739  */
 740 int drm_mode_vrefresh(const struct drm_display_mode *mode)
 741 {
 742         int refresh = 0;
 743         unsigned int calc_val;
 744
 745         if (mode->vrefresh > 0)
 746                 refresh = mode->vrefresh;
 747         else if (mode->htotal > 0 && mode->vtotal > 0) {
 748                 int vtotal;
 749                 vtotal = mode->vtotal;
 750                 /* work out vrefresh the value will be x1000 */
 751                 calc_val = (mode->clock * 1000);
 752                 calc_val /= mode->htotal;
 753                 refresh = (calc_val + vtotal / 2) / vtotal;
 754
 755                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 756                         refresh *= 2;
 757                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 758                         refresh /= 2;
 759                 if (mode->vscan > 1)
 760                         refresh /= mode->vscan;
 761         }
 762         return refresh;
 763 }
 764 EXPORT_SYMBOL(drm_mode_vrefresh);
 765
 766 /**
 767  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
 768  * @p: mode
 769  * @adjust_flags: a combination of adjustment flags
 770  *
 771  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
 772  *
 773  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
 774  *   interlaced modes.
 775  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
 776  *   buffers containing two eyes (only adjust the timings when needed, eg. for
 777  *   "frame packing" or "side by side full").
 778  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
 779  *   be performed for doublescan and vscan > 1 modes respectively.
 780  */
 781 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
 782 {
 783         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
 784                 return;
 785
 786         p->crtc_clock = p->clock;
 787         p->crtc_hdisplay = p->hdisplay;
 788         p->crtc_hsync_start = p->hsync_start;
 789         p->crtc_hsync_end = p->hsync_end;
 790         p->crtc_htotal = p->htotal;
 791         p->crtc_hskew = p->hskew;
 792         p->crtc_vdisplay = p->vdisplay;
 793         p->crtc_vsync_start = p->vsync_start;
 794         p->crtc_vsync_end = p->vsync_end;
 795         p->crtc_vtotal = p->vtotal;
 796
 797         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
 798                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
 799                         p->crtc_vdisplay /= 2;
 800                         p->crtc_vsync_start /= 2;
 801                         p->crtc_vsync_end /= 2;
 802                         p->crtc_vtotal /= 2;
 803                 }
 804         }
 805
 806         if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
 807                 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
 808                         p->crtc_vdisplay *= 2;
 809                         p->crtc_vsync_start *= 2;
 810                         p->crtc_vsync_end *= 2;
 811                         p->crtc_vtotal *= 2;
 812                 }
 813         }
 814
 815         if (!(adjust_flags & CRTC_NO_VSCAN)) {
 816                 if (p->vscan > 1) {
 817                         p->crtc_vdisplay *= p->vscan;
 818                         p->crtc_vsync_start *= p->vscan;
 819                         p->crtc_vsync_end *= p->vscan;
 820                         p->crtc_vtotal *= p->vscan;
 821                 }
 822         }
 823
 824         if (adjust_flags & CRTC_STEREO_DOUBLE) {
 825                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
 826
 827                 switch (layout) {
 828                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
 829                         p->crtc_clock *= 2;
 830                         p->crtc_vdisplay += p->crtc_vtotal;
 831                         p->crtc_vsync_start += p->crtc_vtotal;
 832                         p->crtc_vsync_end += p->crtc_vtotal;
 833                         p->crtc_vtotal += p->crtc_vtotal;
 834                         break;
 835                 }
 836         }
 837
 838         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
 839         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 840         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
 841         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
 842 }
 843 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 844
 845 /**
 846  * drm_mode_copy - copy the mode
 847  * @dst: mode to overwrite
 848  * @src: mode to copy
 849  *
 850  * Copy an existing mode into another mode, preserving the object id and
 851  * list head of the destination mode.
 852  */
 853 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
 854 {
 855         int id = dst->base.id;
 856         struct list_head head = dst->head;
 857
 858         *dst = *src;
 859         dst->base.id = id;
 860         dst->head = head;
 861 }
 862 EXPORT_SYMBOL(drm_mode_copy);
 863
 864 /**
 865  * drm_mode_duplicate - allocate and duplicate an existing mode
 866  * @dev: drm_device to allocate the duplicated mode for
 867  * @mode: mode to duplicate
 868  *
 869  * Just allocate a new mode, copy the existing mode into it, and return
 870  * a pointer to it.  Used to create new instances of established modes.
 871  *
 872  * Returns:
 873  * Pointer to duplicated mode on success, NULL on error.
 874  */
 875 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
 876                                             const struct drm_display_mode *mode)
 877 {
 878         struct drm_display_mode *nmode;
 879
 880         nmode = drm_mode_create(dev);
 881         if (!nmode)
 882                 return NULL;
 883
 884         drm_mode_copy(nmode, mode);
 885
 886         return nmode;
 887 }
 888 EXPORT_SYMBOL(drm_mode_duplicate);
 889
 890 /**
 891  * drm_mode_equal - test modes for equality
 892  * @mode1: first mode
 893  * @mode2: second mode
 894  *
 895  * Check to see if @mode1 and @mode2 are equivalent.
 896  *
 897  * Returns:
 898  * True if the modes are equal, false otherwise.
 899  */
 900 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
 901 {
 902         if (!mode1 && !mode2)
 903                 return true;
 904
 905         if (!mode1 || !mode2)
 906                 return false;
 907
 908         /* do clock check convert to PICOS so fb modes get matched
 909          * the same */
 910         if (mode1->clock && mode2->clock) {
 911                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
 912                         return false;
 913         } else if (mode1->clock != mode2->clock)
 914                 return false;
 915
 916         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
 917             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
 918                 return false;
 919
 920         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
 921 }
 922 EXPORT_SYMBOL(drm_mode_equal);
 923
 924 /**
 925  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
 926  * @mode1: first mode
 927  * @mode2: second mode
 928  *
 929  * Check to see if @mode1 and @mode2 are equivalent, but
 930  * don't check the pixel clocks nor the stereo layout.
 931  *
 932  * Returns:
 933  * True if the modes are equal, false otherwise.
 934  */
 935 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 936                                         const struct drm_display_mode *mode2)
 937 {
 938         if (mode1->hdisplay == mode2->hdisplay &&
 939             mode1->hsync_start == mode2->hsync_start &&
 940             mode1->hsync_end == mode2->hsync_end &&
 941             mode1->htotal == mode2->htotal &&
 942             mode1->hskew == mode2->hskew &&
 943             mode1->vdisplay == mode2->vdisplay &&
 944             mode1->vsync_start == mode2->vsync_start &&
 945             mode1->vsync_end == mode2->vsync_end &&
 946             mode1->vtotal == mode2->vtotal &&
 947             mode1->vscan == mode2->vscan &&
 948             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
 949              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
 950                 return true;
 951
 952         return false;
 953 }
 954 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
 955
 956 /**
 957  * drm_mode_validate_basic - make sure the mode is somewhat sane
 958  * @mode: mode to check
 959  *
 960  * Check that the mode timings are at least somewhat reasonable.
 961  * Any hardware specific limits are left up for each driver to check.
 962  *
 963  * Returns:
 964  * The mode status
 965  */
 966 enum drm_mode_status
 967 drm_mode_validate_basic(const struct drm_display_mode *mode)
 968 {
 969         if (mode->clock == 0)
 970                 return MODE_CLOCK_LOW;
 971
 972         if (mode->hdisplay == 0 ||
 973             mode->hsync_start < mode->hdisplay ||
 974             mode->hsync_end < mode->hsync_start ||
 975             mode->htotal < mode->hsync_end)
 976                 return MODE_H_ILLEGAL;
 977
 978         if (mode->vdisplay == 0 ||
 979             mode->vsync_start < mode->vdisplay ||
 980             mode->vsync_end < mode->vsync_start ||
 981             mode->vtotal < mode->vsync_end)
 982                 return MODE_V_ILLEGAL;
 983
 984         return MODE_OK;
 985 }
 986 EXPORT_SYMBOL(drm_mode_validate_basic);
 987
 988 /**
 989  * drm_mode_validate_size - make sure modes adhere to size constraints
 990  * @mode: mode to check
 991  * @maxX: maximum width
 992  * @maxY: maximum height
 993  *
 994  * This function is a helper which can be used to validate modes against size
 995  * limitations of the DRM device/connector. If a mode is too big its status
 996  * member is updated with the appropriate validation failure code. The list
 997  * itself is not changed.
 998  *
 999  * Returns:
1000  * The mode status
1001  */
1002 enum drm_mode_status
1003 drm_mode_validate_size(const struct drm_display_mode *mode,
1004                        int maxX, int maxY)
1005 {
1006         if (maxX > 0 && mode->hdisplay > maxX)
1007                 return MODE_VIRTUAL_X;
1008
1009         if (maxY > 0 && mode->vdisplay > maxY)
1010                 return MODE_VIRTUAL_Y;
1011
1012         return MODE_OK;
1013 }
1014 EXPORT_SYMBOL(drm_mode_validate_size);
1015
1016 /**
1017  * drm_mode_prune_invalid - remove invalid modes from mode list
1018  * @dev: DRM device
1019  * @mode_list: list of modes to check
1020  * @verbose: be verbose about it
1021  *
1022  * This helper function can be used to prune a display mode list after
1023  * validation has been completed. All modes who's status is not MODE_OK will be
1024  * removed from the list, and if @verbose the status code and mode name is also
1025  * printed to dmesg.
1026  */
1027 void drm_mode_prune_invalid(struct drm_device *dev,
1028                             struct list_head *mode_list, bool verbose)
1029 {
1030         struct drm_display_mode *mode, *t;
1031
1032         list_for_each_entry_safe(mode, t, mode_list, head) {
1033                 if (mode->status != MODE_OK) {
1034                         list_del(&mode->head);
1035                         if (verbose) {
1036                                 drm_mode_debug_printmodeline(mode);
1037                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
1038                                         mode->name, mode->status);
1039                         }
1040                         drm_mode_destroy(dev, mode);
1041                 }
1042         }
1043 }
1044 EXPORT_SYMBOL(drm_mode_prune_invalid);
1045
1046 /**
1047  * drm_mode_compare - compare modes for favorability
1048  * @priv: unused
1049  * @lh_a: list_head for first mode
1050  * @lh_b: list_head for second mode
1051  *
1052  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1053  * which is better.
1054  *
1055  * Returns:
1056  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1057  * positive if @lh_b is better than @lh_a.
1058  */
1059 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1060 {
1061         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1062         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1063         int diff;
1064
1065         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1066                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1067         if (diff)
1068                 return diff;
1069         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1070         if (diff)
1071                 return diff;
1072
1073         diff = b->vrefresh - a->vrefresh;
1074         if (diff)
1075                 return diff;
1076
1077         diff = b->clock - a->clock;
1078         return diff;
1079 }
1080
1081 /**
1082  * drm_mode_sort - sort mode list
1083  * @mode_list: list of drm_display_mode structures to sort
1084  *
1085  * Sort @mode_list by favorability, moving good modes to the head of the list.
1086  */
1087 void drm_mode_sort(struct list_head *mode_list)
1088 {
1089         list_sort(NULL, mode_list, drm_mode_compare);
1090 }
1091 EXPORT_SYMBOL(drm_mode_sort);
1092
1093 /**
1094  * drm_mode_connector_list_update - update the mode list for the connector
1095  * @connector: the connector to update
1096  * @merge_type_bits: whether to merge or overwrite type bits
1097  *
1098  * This moves the modes from the @connector probed_modes list
1099  * to the actual mode list. It compares the probed mode against the current
1100  * list and only adds different/new modes.
1101  *
1102  * This is just a helper functions doesn't validate any modes itself and also
1103  * doesn't prune any invalid modes. Callers need to do that themselves.
1104  */
1105 void drm_mode_connector_list_update(struct drm_connector *connector,
1106                                     bool merge_type_bits)
1107 {
1108         struct drm_display_mode *mode;
1109         struct drm_display_mode *pmode, *pt;
1110         int found_it;
1111
1112         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1113
1114         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1115                                  head) {
1116                 found_it = 0;
1117                 /* go through current modes checking for the new probed mode */
1118                 list_for_each_entry(mode, &connector->modes, head) {
1119                         if (drm_mode_equal(pmode, mode)) {
1120                                 found_it = 1;
1121                                 /* if equal delete the probed mode */
1122                                 mode->status = pmode->status;
1123                                 /* Merge type bits together */
1124                                 if (merge_type_bits)
1125                                         mode->type |= pmode->type;
1126                                 else
1127                                         mode->type = pmode->type;
1128                                 list_del(&pmode->head);
1129                                 drm_mode_destroy(connector->dev, pmode);
1130                                 break;
1131                         }
1132                 }
1133
1134                 if (!found_it) {
1135                         list_move_tail(&pmode->head, &connector->modes);
1136                 }
1137         }
1138 }
1139 EXPORT_SYMBOL(drm_mode_connector_list_update);
1140
1141 /**
1142  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1143  * @mode_option: optional per connector mode option
1144  * @connector: connector to parse modeline for
1145  * @mode: preallocated drm_cmdline_mode structure to fill out
1146  *
1147  * This parses @mode_option command line modeline for modes and options to
1148  * configure the connector. If @mode_option is NULL the default command line
1149  * modeline in fb_mode_option will be parsed instead.
1150  *
1151  * This uses the same parameters as the fb modedb.c, except for an extra
1152  * force-enable, force-enable-digital and force-disable bit at the end:
1153  *
1154  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1155  *
1156  * The intermediate drm_cmdline_mode structure is required to store additional
1157  * options from the command line modline like the force-enable/disable flag.
1158  *
1159  * Returns:
1160  * True if a valid modeline has been parsed, false otherwise.
1161  */
1162 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1163                                                struct drm_connector *connector,
1164                                                struct drm_cmdline_mode *mode)
1165 {
1166         const char *name;
1167         unsigned int namelen;
1168         bool res_specified = false, bpp_specified = false, refresh_specified = false;
1169         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1170         bool yres_specified = false, cvt = false, rb = false;
1171         bool interlace = false, margins = false, was_digit = false;
1172         int i;
1173         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1174
1175 #ifdef CONFIG_FB
1176         if (!mode_option)
1177                 mode_option = fb_mode_option;
1178 #endif
1179
1180         if (!mode_option) {
1181                 mode->specified = false;
1182                 return false;
1183         }
1184
1185         name = mode_option;
1186         namelen = strlen(name);
1187         for (i = namelen-1; i >= 0; i--) {
1188                 switch (name[i]) {
1189                 case '@':
1190                         if (!refresh_specified && !bpp_specified &&
1191                             !yres_specified && !cvt && !rb && was_digit) {
1192                                 refresh = simple_strtol(&name[i+1], NULL, 10);
1193                                 refresh_specified = true;
1194                                 was_digit = false;
1195                         } else
1196                                 goto done;
1197                         break;
1198                 case '-':
1199                         if (!bpp_specified && !yres_specified && !cvt &&
1200                             !rb && was_digit) {
1201                                 bpp = simple_strtol(&name[i+1], NULL, 10);
1202                                 bpp_specified = true;
1203                                 was_digit = false;
1204                         } else
1205                                 goto done;
1206                         break;
1207                 case 'x':
1208                         if (!yres_specified && was_digit) {
1209                                 yres = simple_strtol(&name[i+1], NULL, 10);
1210                                 yres_specified = true;
1211                                 was_digit = false;
1212                         } else
1213                                 goto done;
1214                         break;
1215                 case '0' ... '9':
1216                         was_digit = true;
1217                         break;
1218                 case 'M':
1219                         if (yres_specified || cvt || was_digit)
1220                                 goto done;
1221                         cvt = true;
1222                         break;
1223                 case 'R':
1224                         if (yres_specified || cvt || rb || was_digit)
1225                                 goto done;
1226                         rb = true;
1227                         break;
1228                 case 'm':
1229                         if (cvt || yres_specified || was_digit)
1230                                 goto done;
1231                         margins = true;
1232                         break;
1233                 case 'i':
1234                         if (cvt || yres_specified || was_digit)
1235                                 goto done;
1236                         interlace = true;
1237                         break;
1238                 case 'e':
1239                         if (yres_specified || bpp_specified || refresh_specified ||
1240                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1241                                 goto done;
1242
1243                         force = DRM_FORCE_ON;
1244                         break;
1245                 case 'D':
1246                         if (yres_specified || bpp_specified || refresh_specified ||
1247                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1248                                 goto done;
1249
1250                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1251                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1252                                 force = DRM_FORCE_ON;
1253                         else
1254                                 force = DRM_FORCE_ON_DIGITAL;
1255                         break;
1256                 case 'd':
1257                         if (yres_specified || bpp_specified || refresh_specified ||
1258                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
1259                                 goto done;
1260
1261                         force = DRM_FORCE_OFF;
1262                         break;
1263                 default:
1264                         goto done;
1265                 }
1266         }
1267
1268         if (i < 0 && yres_specified) {
1269                 char *ch;
1270                 xres = simple_strtol(name, &ch, 10);
1271                 if ((ch != NULL) && (*ch == 'x'))
1272                         res_specified = true;
1273                 else
1274                         i = ch - name;
1275         } else if (!yres_specified && was_digit) {
1276                 /* catch mode that begins with digits but has no 'x' */
1277                 i = 0;
1278         }
1279 done:
1280         if (i >= 0) {
1281                 printk(KERN_WARNING
1282                         "parse error at position %i in video mode '%s'\n",
1283                         i, name);
1284                 mode->specified = false;
1285                 return false;
1286         }
1287
1288         if (res_specified) {
1289                 mode->specified = true;
1290                 mode->xres = xres;
1291                 mode->yres = yres;
1292         }
1293
1294         if (refresh_specified) {
1295                 mode->refresh_specified = true;
1296                 mode->refresh = refresh;
1297         }
1298
1299         if (bpp_specified) {
1300                 mode->bpp_specified = true;
1301                 mode->bpp = bpp;
1302         }
1303         mode->rb = rb;
1304         mode->cvt = cvt;
1305         mode->interlace = interlace;
1306         mode->margins = margins;
1307         mode->force = force;
1308
1309         return true;
1310 }
1311 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1312
1313 /**
1314  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1315  * @dev: DRM device to create the new mode for
1316  * @cmd: input command line modeline
1317  *
1318  * Returns:
1319  * Pointer to converted mode on success, NULL on error.
1320  */
1321 struct drm_display_mode *
1322 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1323                                   struct drm_cmdline_mode *cmd)
1324 {
1325         struct drm_display_mode *mode;
1326
1327         if (cmd->cvt)
1328                 mode = drm_cvt_mode(dev,
1329                                     cmd->xres, cmd->yres,
1330                                     cmd->refresh_specified ? cmd->refresh : 60,
1331                                     cmd->rb, cmd->interlace,
1332                                     cmd->margins);
1333         else
1334                 mode = drm_gtf_mode(dev,
1335                                     cmd->xres, cmd->yres,
1336                                     cmd->refresh_specified ? cmd->refresh : 60,
1337                                     cmd->interlace,
1338                                     cmd->margins);
1339         if (!mode)
1340                 return NULL;
1341
1342         mode->type |= DRM_MODE_TYPE_USERDEF;
1343         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1344         return mode;
1345 }
1346 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1347
1348 /**
1349  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1350  * @out: drm_mode_modeinfo struct to return to the user
1351  * @in: drm_display_mode to use
1352  *
1353  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1354  * the user.
1355  */
1356 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1357                                const struct drm_display_mode *in)
1358 {
1359         WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1360              in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1361              in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1362              in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1363              in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1364              "timing values too large for mode info\n");
1365
1366         out->clock = in->clock;
1367         out->hdisplay = in->hdisplay;
1368         out->hsync_start = in->hsync_start;
1369         out->hsync_end = in->hsync_end;
1370         out->htotal = in->htotal;
1371         out->hskew = in->hskew;
1372         out->vdisplay = in->vdisplay;
1373         out->vsync_start = in->vsync_start;
1374         out->vsync_end = in->vsync_end;
1375         out->vtotal = in->vtotal;
1376         out->vscan = in->vscan;
1377         out->vrefresh = in->vrefresh;
1378         out->flags = in->flags;
1379         out->type = in->type;
1380         strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1381         out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1382 }
1383
1384 /**
1385  * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1386  * @out: drm_display_mode to return to the user
1387  * @in: drm_mode_modeinfo to use
1388  *
1389  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1390  * the caller.
1391  *
1392  * Returns:
1393  * Zero on success, negative errno on failure.
1394  */
1395 int drm_mode_convert_umode(struct drm_display_mode *out,
1396                            const struct drm_mode_modeinfo *in)
1397 {
1398         int ret = -EINVAL;
1399
1400         if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
1401                 ret = -ERANGE;
1402                 goto out;
1403         }
1404
1405         if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1406                 goto out;
1407
1408         out->clock = in->clock;
1409         out->hdisplay = in->hdisplay;
1410         out->hsync_start = in->hsync_start;
1411         out->hsync_end = in->hsync_end;
1412         out->htotal = in->htotal;
1413         out->hskew = in->hskew;
1414         out->vdisplay = in->vdisplay;
1415         out->vsync_start = in->vsync_start;
1416         out->vsync_end = in->vsync_end;
1417         out->vtotal = in->vtotal;
1418         out->vscan = in->vscan;
1419         out->vrefresh = in->vrefresh;
1420         out->flags = in->flags;
1421         out->type = in->type;
1422         strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1423         out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1424
1425         out->status = drm_mode_validate_basic(out);
1426         if (out->status != MODE_OK)
1427                 goto out;
1428
1429         ret = 0;
1430
1431 out:
1432         return ret;
1433 }