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