1 /* 2 * Copyright 2016 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 #include <linux/slab.h> 27 28 #include "dm_services.h" 29 #include "dc.h" 30 #include "mod_freesync.h" 31 #include "core_types.h" 32 33 #define MOD_FREESYNC_MAX_CONCURRENT_STREAMS 32 34 35 #define MIN_REFRESH_RANGE_IN_US 10000000 36 /* Refresh rate ramp at a fixed rate of 65 Hz/second */ 37 #define STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME ((1000 / 60) * 65) 38 /* Number of elements in the render times cache array */ 39 #define RENDER_TIMES_MAX_COUNT 10 40 /* Threshold to exit/exit BTR (to avoid frequent enter-exits at the lower limit) */ 41 #define BTR_MAX_MARGIN 2500 42 /* Threshold to change BTR multiplier (to avoid frequent changes) */ 43 #define BTR_DRIFT_MARGIN 2000 44 /*Threshold to exit fixed refresh rate*/ 45 #define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4 46 /* Number of consecutive frames to check before entering/exiting fixed refresh*/ 47 #define FIXED_REFRESH_ENTER_FRAME_COUNT 5 48 #define FIXED_REFRESH_EXIT_FRAME_COUNT 5 49 50 struct core_freesync { 51 struct mod_freesync public; 52 struct dc *dc; 53 }; 54 55 #define MOD_FREESYNC_TO_CORE(mod_freesync)\ 56 container_of(mod_freesync, struct core_freesync, public) 57 58 struct mod_freesync *mod_freesync_create(struct dc *dc) 59 { 60 struct core_freesync *core_freesync = 61 kzalloc(sizeof(struct core_freesync), GFP_KERNEL); 62 63 if (core_freesync == NULL) 64 goto fail_alloc_context; 65 66 if (dc == NULL) 67 goto fail_construct; 68 69 core_freesync->dc = dc; 70 return &core_freesync->public; 71 72 fail_construct: 73 kfree(core_freesync); 74 75 fail_alloc_context: 76 return NULL; 77 } 78 79 void mod_freesync_destroy(struct mod_freesync *mod_freesync) 80 { 81 struct core_freesync *core_freesync = NULL; 82 if (mod_freesync == NULL) 83 return; 84 core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); 85 kfree(core_freesync); 86 } 87 88 #if 0 /* unused currently */ 89 static unsigned int calc_refresh_in_uhz_from_duration( 90 unsigned int duration_in_ns) 91 { 92 unsigned int refresh_in_uhz = 93 ((unsigned int)(div64_u64((1000000000ULL * 1000000), 94 duration_in_ns))); 95 return refresh_in_uhz; 96 } 97 #endif 98 99 static unsigned int calc_duration_in_us_from_refresh_in_uhz( 100 unsigned int refresh_in_uhz) 101 { 102 unsigned int duration_in_us = 103 ((unsigned int)(div64_u64((1000000000ULL * 1000), 104 refresh_in_uhz))); 105 return duration_in_us; 106 } 107 108 static unsigned int calc_duration_in_us_from_v_total( 109 const struct dc_stream_state *stream, 110 const struct mod_vrr_params *in_vrr, 111 unsigned int v_total) 112 { 113 unsigned int duration_in_us = 114 (unsigned int)(div64_u64(((unsigned long long)(v_total) 115 * 10000) * stream->timing.h_total, 116 stream->timing.pix_clk_100hz)); 117 118 return duration_in_us; 119 } 120 121 static unsigned int calc_v_total_from_refresh( 122 const struct dc_stream_state *stream, 123 unsigned int refresh_in_uhz) 124 { 125 unsigned int v_total; 126 unsigned int frame_duration_in_ns; 127 128 frame_duration_in_ns = 129 ((unsigned int)(div64_u64((1000000000ULL * 1000000), 130 refresh_in_uhz))); 131 132 v_total = div64_u64(div64_u64(((unsigned long long)( 133 frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)), 134 stream->timing.h_total), 1000000); 135 136 /* v_total cannot be less than nominal */ 137 if (v_total < stream->timing.v_total) { 138 ASSERT(v_total < stream->timing.v_total); 139 v_total = stream->timing.v_total; 140 } 141 142 return v_total; 143 } 144 145 static unsigned int calc_v_total_from_duration( 146 const struct dc_stream_state *stream, 147 const struct mod_vrr_params *vrr, 148 unsigned int duration_in_us) 149 { 150 unsigned int v_total = 0; 151 152 if (duration_in_us < vrr->min_duration_in_us) 153 duration_in_us = vrr->min_duration_in_us; 154 155 if (duration_in_us > vrr->max_duration_in_us) 156 duration_in_us = vrr->max_duration_in_us; 157 158 v_total = div64_u64(div64_u64(((unsigned long long)( 159 duration_in_us) * (stream->timing.pix_clk_100hz / 10)), 160 stream->timing.h_total), 1000); 161 162 /* v_total cannot be less than nominal */ 163 if (v_total < stream->timing.v_total) { 164 ASSERT(v_total < stream->timing.v_total); 165 v_total = stream->timing.v_total; 166 } 167 168 return v_total; 169 } 170 171 static void update_v_total_for_static_ramp( 172 struct core_freesync *core_freesync, 173 const struct dc_stream_state *stream, 174 struct mod_vrr_params *in_out_vrr) 175 { 176 unsigned int v_total = 0; 177 unsigned int current_duration_in_us = 178 calc_duration_in_us_from_v_total( 179 stream, in_out_vrr, 180 in_out_vrr->adjust.v_total_max); 181 unsigned int target_duration_in_us = 182 calc_duration_in_us_from_refresh_in_uhz( 183 in_out_vrr->fixed.target_refresh_in_uhz); 184 bool ramp_direction_is_up = (current_duration_in_us > 185 target_duration_in_us) ? true : false; 186 187 /* Calc ratio between new and current frame duration with 3 digit */ 188 unsigned int frame_duration_ratio = div64_u64(1000000, 189 (1000 + div64_u64(((unsigned long long)( 190 STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME) * 191 current_duration_in_us), 192 1000000))); 193 194 /* Calculate delta between new and current frame duration in us */ 195 unsigned int frame_duration_delta = div64_u64(((unsigned long long)( 196 current_duration_in_us) * 197 (1000 - frame_duration_ratio)), 1000); 198 199 /* Adjust frame duration delta based on ratio between current and 200 * standard frame duration (frame duration at 60 Hz refresh rate). 201 */ 202 unsigned int ramp_rate_interpolated = div64_u64(((unsigned long long)( 203 frame_duration_delta) * current_duration_in_us), 16666); 204 205 /* Going to a higher refresh rate (lower frame duration) */ 206 if (ramp_direction_is_up) { 207 /* reduce frame duration */ 208 current_duration_in_us -= ramp_rate_interpolated; 209 210 /* adjust for frame duration below min */ 211 if (current_duration_in_us <= target_duration_in_us) { 212 in_out_vrr->fixed.ramping_active = false; 213 in_out_vrr->fixed.ramping_done = true; 214 current_duration_in_us = 215 calc_duration_in_us_from_refresh_in_uhz( 216 in_out_vrr->fixed.target_refresh_in_uhz); 217 } 218 /* Going to a lower refresh rate (larger frame duration) */ 219 } else { 220 /* increase frame duration */ 221 current_duration_in_us += ramp_rate_interpolated; 222 223 /* adjust for frame duration above max */ 224 if (current_duration_in_us >= target_duration_in_us) { 225 in_out_vrr->fixed.ramping_active = false; 226 in_out_vrr->fixed.ramping_done = true; 227 current_duration_in_us = 228 calc_duration_in_us_from_refresh_in_uhz( 229 in_out_vrr->fixed.target_refresh_in_uhz); 230 } 231 } 232 233 v_total = div64_u64(div64_u64(((unsigned long long)( 234 current_duration_in_us) * (stream->timing.pix_clk_100hz / 10)), 235 stream->timing.h_total), 1000); 236 237 /* v_total cannot be less than nominal */ 238 if (v_total < stream->timing.v_total) 239 v_total = stream->timing.v_total; 240 241 in_out_vrr->adjust.v_total_min = v_total; 242 in_out_vrr->adjust.v_total_max = v_total; 243 } 244 245 static void apply_below_the_range(struct core_freesync *core_freesync, 246 const struct dc_stream_state *stream, 247 unsigned int last_render_time_in_us, 248 struct mod_vrr_params *in_out_vrr) 249 { 250 unsigned int inserted_frame_duration_in_us = 0; 251 unsigned int mid_point_frames_ceil = 0; 252 unsigned int mid_point_frames_floor = 0; 253 unsigned int frame_time_in_us = 0; 254 unsigned int delta_from_mid_point_in_us_1 = 0xFFFFFFFF; 255 unsigned int delta_from_mid_point_in_us_2 = 0xFFFFFFFF; 256 unsigned int frames_to_insert = 0; 257 unsigned int delta_from_mid_point_delta_in_us; 258 unsigned int max_render_time_in_us = 259 in_out_vrr->max_duration_in_us - in_out_vrr->btr.margin_in_us; 260 261 /* Program BTR */ 262 if ((last_render_time_in_us + in_out_vrr->btr.margin_in_us / 2) < max_render_time_in_us) { 263 /* Exit Below the Range */ 264 if (in_out_vrr->btr.btr_active) { 265 in_out_vrr->btr.frame_counter = 0; 266 in_out_vrr->btr.btr_active = false; 267 } 268 } else if (last_render_time_in_us > (max_render_time_in_us + in_out_vrr->btr.margin_in_us / 2)) { 269 /* Enter Below the Range */ 270 if (!in_out_vrr->btr.btr_active) { 271 in_out_vrr->btr.btr_active = true; 272 } 273 } 274 275 /* BTR set to "not active" so disengage */ 276 if (!in_out_vrr->btr.btr_active) { 277 in_out_vrr->btr.inserted_duration_in_us = 0; 278 in_out_vrr->btr.frames_to_insert = 0; 279 in_out_vrr->btr.frame_counter = 0; 280 281 /* Restore FreeSync */ 282 in_out_vrr->adjust.v_total_min = 283 calc_v_total_from_refresh(stream, 284 in_out_vrr->max_refresh_in_uhz); 285 in_out_vrr->adjust.v_total_max = 286 calc_v_total_from_refresh(stream, 287 in_out_vrr->min_refresh_in_uhz); 288 /* BTR set to "active" so engage */ 289 } else { 290 291 /* Calculate number of midPoint frames that could fit within 292 * the render time interval- take ceil of this value 293 */ 294 mid_point_frames_ceil = (last_render_time_in_us + 295 in_out_vrr->btr.mid_point_in_us - 1) / 296 in_out_vrr->btr.mid_point_in_us; 297 298 if (mid_point_frames_ceil > 0) { 299 frame_time_in_us = last_render_time_in_us / 300 mid_point_frames_ceil; 301 delta_from_mid_point_in_us_1 = 302 (in_out_vrr->btr.mid_point_in_us > 303 frame_time_in_us) ? 304 (in_out_vrr->btr.mid_point_in_us - frame_time_in_us) : 305 (frame_time_in_us - in_out_vrr->btr.mid_point_in_us); 306 } 307 308 /* Calculate number of midPoint frames that could fit within 309 * the render time interval- take floor of this value 310 */ 311 mid_point_frames_floor = last_render_time_in_us / 312 in_out_vrr->btr.mid_point_in_us; 313 314 if (mid_point_frames_floor > 0) { 315 316 frame_time_in_us = last_render_time_in_us / 317 mid_point_frames_floor; 318 delta_from_mid_point_in_us_2 = 319 (in_out_vrr->btr.mid_point_in_us > 320 frame_time_in_us) ? 321 (in_out_vrr->btr.mid_point_in_us - frame_time_in_us) : 322 (frame_time_in_us - in_out_vrr->btr.mid_point_in_us); 323 } 324 325 /* Choose number of frames to insert based on how close it 326 * can get to the mid point of the variable range. 327 */ 328 if ((frame_time_in_us / mid_point_frames_ceil) > in_out_vrr->min_duration_in_us && 329 (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2 || 330 mid_point_frames_floor < 2)) { 331 frames_to_insert = mid_point_frames_ceil; 332 delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_2 - 333 delta_from_mid_point_in_us_1; 334 } else { 335 frames_to_insert = mid_point_frames_floor; 336 delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_1 - 337 delta_from_mid_point_in_us_2; 338 } 339 340 /* Prefer current frame multiplier when BTR is enabled unless it drifts 341 * too far from the midpoint 342 */ 343 if (in_out_vrr->btr.frames_to_insert != 0 && 344 delta_from_mid_point_delta_in_us < BTR_DRIFT_MARGIN) { 345 if (((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) < 346 max_render_time_in_us) && 347 ((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) > 348 in_out_vrr->min_duration_in_us)) 349 frames_to_insert = in_out_vrr->btr.frames_to_insert; 350 } 351 352 /* Either we've calculated the number of frames to insert, 353 * or we need to insert min duration frames 354 */ 355 if (last_render_time_in_us / frames_to_insert < 356 in_out_vrr->min_duration_in_us){ 357 frames_to_insert -= (frames_to_insert > 1) ? 358 1 : 0; 359 } 360 361 if (frames_to_insert > 0) 362 inserted_frame_duration_in_us = last_render_time_in_us / 363 frames_to_insert; 364 365 if (inserted_frame_duration_in_us < in_out_vrr->min_duration_in_us) 366 inserted_frame_duration_in_us = in_out_vrr->min_duration_in_us; 367 368 /* Cache the calculated variables */ 369 in_out_vrr->btr.inserted_duration_in_us = 370 inserted_frame_duration_in_us; 371 in_out_vrr->btr.frames_to_insert = frames_to_insert; 372 in_out_vrr->btr.frame_counter = frames_to_insert; 373 } 374 } 375 376 static void apply_fixed_refresh(struct core_freesync *core_freesync, 377 const struct dc_stream_state *stream, 378 unsigned int last_render_time_in_us, 379 struct mod_vrr_params *in_out_vrr) 380 { 381 bool update = false; 382 unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us; 383 384 /* Compute the exit refresh rate and exit frame duration */ 385 unsigned int exit_refresh_rate_in_milli_hz = ((1000000000/max_render_time_in_us) 386 + (1000*FIXED_REFRESH_EXIT_MARGIN_IN_HZ)); 387 unsigned int exit_frame_duration_in_us = 1000000000/exit_refresh_rate_in_milli_hz; 388 389 if (last_render_time_in_us < exit_frame_duration_in_us) { 390 /* Exit Fixed Refresh mode */ 391 if (in_out_vrr->fixed.fixed_active) { 392 in_out_vrr->fixed.frame_counter++; 393 394 if (in_out_vrr->fixed.frame_counter > 395 FIXED_REFRESH_EXIT_FRAME_COUNT) { 396 in_out_vrr->fixed.frame_counter = 0; 397 in_out_vrr->fixed.fixed_active = false; 398 in_out_vrr->fixed.target_refresh_in_uhz = 0; 399 update = true; 400 } 401 } 402 } else if (last_render_time_in_us > max_render_time_in_us) { 403 /* Enter Fixed Refresh mode */ 404 if (!in_out_vrr->fixed.fixed_active) { 405 in_out_vrr->fixed.frame_counter++; 406 407 if (in_out_vrr->fixed.frame_counter > 408 FIXED_REFRESH_ENTER_FRAME_COUNT) { 409 in_out_vrr->fixed.frame_counter = 0; 410 in_out_vrr->fixed.fixed_active = true; 411 in_out_vrr->fixed.target_refresh_in_uhz = 412 in_out_vrr->max_refresh_in_uhz; 413 update = true; 414 } 415 } 416 } 417 418 if (update) { 419 if (in_out_vrr->fixed.fixed_active) { 420 in_out_vrr->adjust.v_total_min = 421 calc_v_total_from_refresh( 422 stream, in_out_vrr->max_refresh_in_uhz); 423 in_out_vrr->adjust.v_total_max = 424 in_out_vrr->adjust.v_total_min; 425 } else { 426 in_out_vrr->adjust.v_total_min = 427 calc_v_total_from_refresh(stream, 428 in_out_vrr->max_refresh_in_uhz); 429 in_out_vrr->adjust.v_total_max = 430 calc_v_total_from_refresh(stream, 431 in_out_vrr->min_refresh_in_uhz); 432 } 433 } 434 } 435 436 static bool vrr_settings_require_update(struct core_freesync *core_freesync, 437 struct mod_freesync_config *in_config, 438 unsigned int min_refresh_in_uhz, 439 unsigned int max_refresh_in_uhz, 440 struct mod_vrr_params *in_vrr) 441 { 442 if (in_vrr->state != in_config->state) { 443 return true; 444 } else if (in_vrr->state == VRR_STATE_ACTIVE_FIXED && 445 in_vrr->fixed.target_refresh_in_uhz != 446 in_config->fixed_refresh_in_uhz) { 447 return true; 448 } else if (in_vrr->min_refresh_in_uhz != min_refresh_in_uhz) { 449 return true; 450 } else if (in_vrr->max_refresh_in_uhz != max_refresh_in_uhz) { 451 return true; 452 } 453 454 return false; 455 } 456 457 bool mod_freesync_get_vmin_vmax(struct mod_freesync *mod_freesync, 458 const struct dc_stream_state *stream, 459 unsigned int *vmin, 460 unsigned int *vmax) 461 { 462 *vmin = stream->adjust.v_total_min; 463 *vmax = stream->adjust.v_total_max; 464 465 return true; 466 } 467 468 bool mod_freesync_get_v_position(struct mod_freesync *mod_freesync, 469 struct dc_stream_state *stream, 470 unsigned int *nom_v_pos, 471 unsigned int *v_pos) 472 { 473 struct core_freesync *core_freesync = NULL; 474 struct crtc_position position; 475 476 if (mod_freesync == NULL) 477 return false; 478 479 core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); 480 481 if (dc_stream_get_crtc_position(core_freesync->dc, &stream, 1, 482 &position.vertical_count, 483 &position.nominal_vcount)) { 484 485 *nom_v_pos = position.nominal_vcount; 486 *v_pos = position.vertical_count; 487 488 return true; 489 } 490 491 return false; 492 } 493 494 static void build_vrr_infopacket_data_v1(const struct mod_vrr_params *vrr, 495 struct dc_info_packet *infopacket) 496 { 497 /* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */ 498 infopacket->sb[1] = 0x1A; 499 500 /* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */ 501 infopacket->sb[2] = 0x00; 502 503 /* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */ 504 infopacket->sb[3] = 0x00; 505 506 /* PB4 = Reserved */ 507 508 /* PB5 = Reserved */ 509 510 /* PB6 = [Bits 7:3 = Reserved] */ 511 512 /* PB6 = [Bit 0 = FreeSync Supported] */ 513 if (vrr->state != VRR_STATE_UNSUPPORTED) 514 infopacket->sb[6] |= 0x01; 515 516 /* PB6 = [Bit 1 = FreeSync Enabled] */ 517 if (vrr->state != VRR_STATE_DISABLED && 518 vrr->state != VRR_STATE_UNSUPPORTED) 519 infopacket->sb[6] |= 0x02; 520 521 /* PB6 = [Bit 2 = FreeSync Active] */ 522 if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || 523 vrr->state == VRR_STATE_ACTIVE_FIXED) 524 infopacket->sb[6] |= 0x04; 525 526 // For v1 & 2 infoframes program nominal if non-fs mode, otherwise full range 527 /* PB7 = FreeSync Minimum refresh rate (Hz) */ 528 if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || 529 vrr->state == VRR_STATE_ACTIVE_FIXED) { 530 infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000); 531 } else { 532 infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); 533 } 534 535 /* PB8 = FreeSync Maximum refresh rate (Hz) 536 * Note: We should never go above the field rate of the mode timing set. 537 */ 538 infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); 539 540 //FreeSync HDR 541 infopacket->sb[9] = 0; 542 infopacket->sb[10] = 0; 543 } 544 545 static void build_vrr_infopacket_data_v3(const struct mod_vrr_params *vrr, 546 struct dc_info_packet *infopacket) 547 { 548 /* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */ 549 infopacket->sb[1] = 0x1A; 550 551 /* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */ 552 infopacket->sb[2] = 0x00; 553 554 /* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */ 555 infopacket->sb[3] = 0x00; 556 557 /* PB4 = Reserved */ 558 559 /* PB5 = Reserved */ 560 561 /* PB6 = [Bits 7:3 = Reserved] */ 562 563 /* PB6 = [Bit 0 = FreeSync Supported] */ 564 if (vrr->state != VRR_STATE_UNSUPPORTED) 565 infopacket->sb[6] |= 0x01; 566 567 /* PB6 = [Bit 1 = FreeSync Enabled] */ 568 if (vrr->state != VRR_STATE_DISABLED && 569 vrr->state != VRR_STATE_UNSUPPORTED) 570 infopacket->sb[6] |= 0x02; 571 572 /* PB6 = [Bit 2 = FreeSync Active] */ 573 if (vrr->state == VRR_STATE_ACTIVE_VARIABLE || 574 vrr->state == VRR_STATE_ACTIVE_FIXED) 575 infopacket->sb[6] |= 0x04; 576 577 if (vrr->state == VRR_STATE_ACTIVE_FIXED) { 578 /* PB7 = FreeSync Minimum refresh rate (Hz) */ 579 infopacket->sb[7] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000); 580 /* PB8 = FreeSync Maximum refresh rate (Hz) */ 581 infopacket->sb[8] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000); 582 } else if (vrr->state == VRR_STATE_ACTIVE_VARIABLE) { 583 /* PB7 = FreeSync Minimum refresh rate (Hz) */ 584 infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000); 585 /* PB8 = FreeSync Maximum refresh rate (Hz) */ 586 infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); 587 } else { 588 // Non-fs case, program nominal range 589 /* PB7 = FreeSync Minimum refresh rate (Hz) */ 590 infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); 591 /* PB8 = FreeSync Maximum refresh rate (Hz) */ 592 infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000); 593 } 594 595 //FreeSync HDR 596 infopacket->sb[9] = 0; 597 infopacket->sb[10] = 0; 598 } 599 600 static void build_vrr_infopacket_fs2_data(enum color_transfer_func app_tf, 601 struct dc_info_packet *infopacket) 602 { 603 if (app_tf != TRANSFER_FUNC_UNKNOWN) { 604 infopacket->valid = true; 605 606 infopacket->sb[6] |= 0x08; // PB6 = [Bit 3 = Native Color Active] 607 608 if (app_tf == TRANSFER_FUNC_GAMMA_22) { 609 infopacket->sb[9] |= 0x04; // PB6 = [Bit 2 = Gamma 2.2 EOTF Active] 610 } 611 } 612 } 613 614 static void build_vrr_infopacket_header_v1(enum signal_type signal, 615 struct dc_info_packet *infopacket, 616 unsigned int *payload_size) 617 { 618 if (dc_is_hdmi_signal(signal)) { 619 620 /* HEADER */ 621 622 /* HB0 = Packet Type = 0x83 (Source Product 623 * Descriptor InfoFrame) 624 */ 625 infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD; 626 627 /* HB1 = Version = 0x01 */ 628 infopacket->hb1 = 0x01; 629 630 /* HB2 = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x08] */ 631 infopacket->hb2 = 0x08; 632 633 *payload_size = 0x08; 634 635 } else if (dc_is_dp_signal(signal)) { 636 637 /* HEADER */ 638 639 /* HB0 = Secondary-data Packet ID = 0 - Only non-zero 640 * when used to associate audio related info packets 641 */ 642 infopacket->hb0 = 0x00; 643 644 /* HB1 = Packet Type = 0x83 (Source Product 645 * Descriptor InfoFrame) 646 */ 647 infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD; 648 649 /* HB2 = [Bits 7:0 = Least significant eight bits - 650 * For INFOFRAME, the value must be 1Bh] 651 */ 652 infopacket->hb2 = 0x1B; 653 654 /* HB3 = [Bits 7:2 = INFOFRAME SDP Version Number = 0x1] 655 * [Bits 1:0 = Most significant two bits = 0x00] 656 */ 657 infopacket->hb3 = 0x04; 658 659 *payload_size = 0x1B; 660 } 661 } 662 663 static void build_vrr_infopacket_header_v2(enum signal_type signal, 664 struct dc_info_packet *infopacket, 665 unsigned int *payload_size) 666 { 667 if (dc_is_hdmi_signal(signal)) { 668 669 /* HEADER */ 670 671 /* HB0 = Packet Type = 0x83 (Source Product 672 * Descriptor InfoFrame) 673 */ 674 infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD; 675 676 /* HB1 = Version = 0x02 */ 677 infopacket->hb1 = 0x02; 678 679 /* HB2 = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x09] */ 680 infopacket->hb2 = 0x09; 681 682 *payload_size = 0x0A; 683 684 } else if (dc_is_dp_signal(signal)) { 685 686 /* HEADER */ 687 688 /* HB0 = Secondary-data Packet ID = 0 - Only non-zero 689 * when used to associate audio related info packets 690 */ 691 infopacket->hb0 = 0x00; 692 693 /* HB1 = Packet Type = 0x83 (Source Product 694 * Descriptor InfoFrame) 695 */ 696 infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD; 697 698 /* HB2 = [Bits 7:0 = Least significant eight bits - 699 * For INFOFRAME, the value must be 1Bh] 700 */ 701 infopacket->hb2 = 0x1B; 702 703 /* HB3 = [Bits 7:2 = INFOFRAME SDP Version Number = 0x2] 704 * [Bits 1:0 = Most significant two bits = 0x00] 705 */ 706 infopacket->hb3 = 0x08; 707 708 *payload_size = 0x1B; 709 } 710 } 711 712 static void build_vrr_infopacket_checksum(unsigned int *payload_size, 713 struct dc_info_packet *infopacket) 714 { 715 /* Calculate checksum */ 716 unsigned int idx = 0; 717 unsigned char checksum = 0; 718 719 checksum += infopacket->hb0; 720 checksum += infopacket->hb1; 721 checksum += infopacket->hb2; 722 checksum += infopacket->hb3; 723 724 for (idx = 1; idx <= *payload_size; idx++) 725 checksum += infopacket->sb[idx]; 726 727 /* PB0 = Checksum (one byte complement) */ 728 infopacket->sb[0] = (unsigned char)(0x100 - checksum); 729 730 infopacket->valid = true; 731 } 732 733 static void build_vrr_infopacket_v1(enum signal_type signal, 734 const struct mod_vrr_params *vrr, 735 struct dc_info_packet *infopacket) 736 { 737 /* SPD info packet for FreeSync */ 738 unsigned int payload_size = 0; 739 740 build_vrr_infopacket_header_v1(signal, infopacket, &payload_size); 741 build_vrr_infopacket_data_v1(vrr, infopacket); 742 build_vrr_infopacket_checksum(&payload_size, infopacket); 743 744 infopacket->valid = true; 745 } 746 747 static void build_vrr_infopacket_v2(enum signal_type signal, 748 const struct mod_vrr_params *vrr, 749 enum color_transfer_func app_tf, 750 struct dc_info_packet *infopacket) 751 { 752 unsigned int payload_size = 0; 753 754 build_vrr_infopacket_header_v2(signal, infopacket, &payload_size); 755 build_vrr_infopacket_data_v1(vrr, infopacket); 756 757 build_vrr_infopacket_fs2_data(app_tf, infopacket); 758 759 build_vrr_infopacket_checksum(&payload_size, infopacket); 760 761 infopacket->valid = true; 762 } 763 764 static void build_vrr_infopacket_v3(enum signal_type signal, 765 const struct mod_vrr_params *vrr, 766 enum color_transfer_func app_tf, 767 struct dc_info_packet *infopacket) 768 { 769 unsigned int payload_size = 0; 770 771 build_vrr_infopacket_header_v2(signal, infopacket, &payload_size); 772 build_vrr_infopacket_data_v3(vrr, infopacket); 773 774 build_vrr_infopacket_fs2_data(app_tf, infopacket); 775 776 build_vrr_infopacket_checksum(&payload_size, infopacket); 777 778 infopacket->valid = true; 779 } 780 781 void mod_freesync_build_vrr_infopacket(struct mod_freesync *mod_freesync, 782 const struct dc_stream_state *stream, 783 const struct mod_vrr_params *vrr, 784 enum vrr_packet_type packet_type, 785 enum color_transfer_func app_tf, 786 struct dc_info_packet *infopacket) 787 { 788 /* SPD info packet for FreeSync 789 * VTEM info packet for HdmiVRR 790 * Check if Freesync is supported. Return if false. If true, 791 * set the corresponding bit in the info packet 792 */ 793 if (!vrr->supported || (!vrr->send_info_frame)) 794 return; 795 796 switch (packet_type) { 797 case PACKET_TYPE_FS_V3: 798 build_vrr_infopacket_v3(stream->signal, vrr, app_tf, infopacket); 799 break; 800 case PACKET_TYPE_FS_V2: 801 build_vrr_infopacket_v2(stream->signal, vrr, app_tf, infopacket); 802 break; 803 case PACKET_TYPE_VRR: 804 case PACKET_TYPE_FS_V1: 805 default: 806 build_vrr_infopacket_v1(stream->signal, vrr, infopacket); 807 } 808 } 809 810 void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync, 811 const struct dc_stream_state *stream, 812 struct mod_freesync_config *in_config, 813 struct mod_vrr_params *in_out_vrr) 814 { 815 struct core_freesync *core_freesync = NULL; 816 unsigned long long nominal_field_rate_in_uhz = 0; 817 unsigned long long rounded_nominal_in_uhz = 0; 818 unsigned int refresh_range = 0; 819 unsigned long long min_refresh_in_uhz = 0; 820 unsigned long long max_refresh_in_uhz = 0; 821 822 if (mod_freesync == NULL) 823 return; 824 825 core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); 826 827 /* Calculate nominal field rate for stream */ 828 nominal_field_rate_in_uhz = 829 mod_freesync_calc_nominal_field_rate(stream); 830 831 min_refresh_in_uhz = in_config->min_refresh_in_uhz; 832 max_refresh_in_uhz = in_config->max_refresh_in_uhz; 833 834 // Full range may be larger than current video timing, so cap at nominal 835 if (max_refresh_in_uhz > nominal_field_rate_in_uhz) 836 max_refresh_in_uhz = nominal_field_rate_in_uhz; 837 838 // Full range may be larger than current video timing, so cap at nominal 839 if (min_refresh_in_uhz > max_refresh_in_uhz) 840 min_refresh_in_uhz = max_refresh_in_uhz; 841 842 // If a monitor reports exactly max refresh of 2x of min, enforce it on nominal 843 rounded_nominal_in_uhz = 844 div_u64(nominal_field_rate_in_uhz + 50000, 100000) * 100000; 845 if (in_config->max_refresh_in_uhz == (2 * in_config->min_refresh_in_uhz) && 846 in_config->max_refresh_in_uhz == rounded_nominal_in_uhz) 847 min_refresh_in_uhz = div_u64(nominal_field_rate_in_uhz, 2); 848 849 if (!vrr_settings_require_update(core_freesync, 850 in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz, 851 in_out_vrr)) 852 return; 853 854 in_out_vrr->state = in_config->state; 855 in_out_vrr->send_info_frame = in_config->vsif_supported; 856 857 if (in_config->state == VRR_STATE_UNSUPPORTED) { 858 in_out_vrr->state = VRR_STATE_UNSUPPORTED; 859 in_out_vrr->supported = false; 860 in_out_vrr->adjust.v_total_min = stream->timing.v_total; 861 in_out_vrr->adjust.v_total_max = stream->timing.v_total; 862 863 return; 864 865 } else { 866 in_out_vrr->min_refresh_in_uhz = (unsigned int)min_refresh_in_uhz; 867 in_out_vrr->max_duration_in_us = 868 calc_duration_in_us_from_refresh_in_uhz( 869 (unsigned int)min_refresh_in_uhz); 870 871 in_out_vrr->max_refresh_in_uhz = (unsigned int)max_refresh_in_uhz; 872 in_out_vrr->min_duration_in_us = 873 calc_duration_in_us_from_refresh_in_uhz( 874 (unsigned int)max_refresh_in_uhz); 875 876 if (in_config->state == VRR_STATE_ACTIVE_FIXED) 877 in_out_vrr->fixed_refresh_in_uhz = in_config->fixed_refresh_in_uhz; 878 else 879 in_out_vrr->fixed_refresh_in_uhz = 0; 880 881 refresh_range = in_out_vrr->max_refresh_in_uhz - 882 in_out_vrr->min_refresh_in_uhz; 883 884 in_out_vrr->supported = true; 885 } 886 887 in_out_vrr->fixed.ramping_active = in_config->ramping; 888 889 in_out_vrr->btr.btr_enabled = in_config->btr; 890 891 if (in_out_vrr->max_refresh_in_uhz < (2 * in_out_vrr->min_refresh_in_uhz)) 892 in_out_vrr->btr.btr_enabled = false; 893 else { 894 in_out_vrr->btr.margin_in_us = in_out_vrr->max_duration_in_us - 895 2 * in_out_vrr->min_duration_in_us; 896 if (in_out_vrr->btr.margin_in_us > BTR_MAX_MARGIN) 897 in_out_vrr->btr.margin_in_us = BTR_MAX_MARGIN; 898 } 899 900 in_out_vrr->btr.btr_active = false; 901 in_out_vrr->btr.inserted_duration_in_us = 0; 902 in_out_vrr->btr.frames_to_insert = 0; 903 in_out_vrr->btr.frame_counter = 0; 904 in_out_vrr->fixed.fixed_active = false; 905 in_out_vrr->fixed.target_refresh_in_uhz = 0; 906 907 in_out_vrr->btr.mid_point_in_us = 908 (in_out_vrr->min_duration_in_us + 909 in_out_vrr->max_duration_in_us) / 2; 910 911 if (in_out_vrr->state == VRR_STATE_UNSUPPORTED) { 912 in_out_vrr->adjust.v_total_min = stream->timing.v_total; 913 in_out_vrr->adjust.v_total_max = stream->timing.v_total; 914 } else if (in_out_vrr->state == VRR_STATE_DISABLED) { 915 in_out_vrr->adjust.v_total_min = stream->timing.v_total; 916 in_out_vrr->adjust.v_total_max = stream->timing.v_total; 917 } else if (in_out_vrr->state == VRR_STATE_INACTIVE) { 918 in_out_vrr->adjust.v_total_min = stream->timing.v_total; 919 in_out_vrr->adjust.v_total_max = stream->timing.v_total; 920 } else if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE && 921 refresh_range >= MIN_REFRESH_RANGE_IN_US) { 922 923 in_out_vrr->adjust.v_total_min = 924 calc_v_total_from_refresh(stream, 925 in_out_vrr->max_refresh_in_uhz); 926 in_out_vrr->adjust.v_total_max = 927 calc_v_total_from_refresh(stream, 928 in_out_vrr->min_refresh_in_uhz); 929 } else if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED) { 930 in_out_vrr->fixed.target_refresh_in_uhz = 931 in_out_vrr->fixed_refresh_in_uhz; 932 if (in_out_vrr->fixed.ramping_active && 933 in_out_vrr->fixed.fixed_active) { 934 /* Do not update vtotals if ramping is already active 935 * in order to continue ramp from current refresh. 936 */ 937 in_out_vrr->fixed.fixed_active = true; 938 } else { 939 in_out_vrr->fixed.fixed_active = true; 940 in_out_vrr->adjust.v_total_min = 941 calc_v_total_from_refresh(stream, 942 in_out_vrr->fixed.target_refresh_in_uhz); 943 in_out_vrr->adjust.v_total_max = 944 in_out_vrr->adjust.v_total_min; 945 } 946 } else { 947 in_out_vrr->state = VRR_STATE_INACTIVE; 948 in_out_vrr->adjust.v_total_min = stream->timing.v_total; 949 in_out_vrr->adjust.v_total_max = stream->timing.v_total; 950 } 951 } 952 953 void mod_freesync_handle_preflip(struct mod_freesync *mod_freesync, 954 const struct dc_plane_state *plane, 955 const struct dc_stream_state *stream, 956 unsigned int curr_time_stamp_in_us, 957 struct mod_vrr_params *in_out_vrr) 958 { 959 struct core_freesync *core_freesync = NULL; 960 unsigned int last_render_time_in_us = 0; 961 unsigned int average_render_time_in_us = 0; 962 963 if (mod_freesync == NULL) 964 return; 965 966 core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); 967 968 if (in_out_vrr->supported && 969 in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) { 970 unsigned int i = 0; 971 unsigned int oldest_index = plane->time.index + 1; 972 973 if (oldest_index >= DC_PLANE_UPDATE_TIMES_MAX) 974 oldest_index = 0; 975 976 last_render_time_in_us = curr_time_stamp_in_us - 977 plane->time.prev_update_time_in_us; 978 979 // Sum off all entries except oldest one 980 for (i = 0; i < DC_PLANE_UPDATE_TIMES_MAX; i++) { 981 average_render_time_in_us += 982 plane->time.time_elapsed_in_us[i]; 983 } 984 average_render_time_in_us -= 985 plane->time.time_elapsed_in_us[oldest_index]; 986 987 // Add render time for current flip 988 average_render_time_in_us += last_render_time_in_us; 989 average_render_time_in_us /= DC_PLANE_UPDATE_TIMES_MAX; 990 991 if (in_out_vrr->btr.btr_enabled) { 992 apply_below_the_range(core_freesync, 993 stream, 994 last_render_time_in_us, 995 in_out_vrr); 996 } else { 997 apply_fixed_refresh(core_freesync, 998 stream, 999 last_render_time_in_us, 1000 in_out_vrr); 1001 } 1002 1003 } 1004 } 1005 1006 void mod_freesync_handle_v_update(struct mod_freesync *mod_freesync, 1007 const struct dc_stream_state *stream, 1008 struct mod_vrr_params *in_out_vrr) 1009 { 1010 struct core_freesync *core_freesync = NULL; 1011 1012 if ((mod_freesync == NULL) || (stream == NULL) || (in_out_vrr == NULL)) 1013 return; 1014 1015 core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync); 1016 1017 if (in_out_vrr->supported == false) 1018 return; 1019 1020 /* Below the Range Logic */ 1021 1022 /* Only execute if in fullscreen mode */ 1023 if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE && 1024 in_out_vrr->btr.btr_active) { 1025 /* TODO: pass in flag for Pre-DCE12 ASIC 1026 * in order for frame variable duration to take affect, 1027 * it needs to be done one VSYNC early, which is at 1028 * frameCounter == 1. 1029 * For DCE12 and newer updates to V_TOTAL_MIN/MAX 1030 * will take affect on current frame 1031 */ 1032 if (in_out_vrr->btr.frames_to_insert == 1033 in_out_vrr->btr.frame_counter) { 1034 in_out_vrr->adjust.v_total_min = 1035 calc_v_total_from_duration(stream, 1036 in_out_vrr, 1037 in_out_vrr->btr.inserted_duration_in_us); 1038 in_out_vrr->adjust.v_total_max = 1039 in_out_vrr->adjust.v_total_min; 1040 } 1041 1042 if (in_out_vrr->btr.frame_counter > 0) 1043 in_out_vrr->btr.frame_counter--; 1044 1045 /* Restore FreeSync */ 1046 if (in_out_vrr->btr.frame_counter == 0) { 1047 in_out_vrr->adjust.v_total_min = 1048 calc_v_total_from_refresh(stream, 1049 in_out_vrr->max_refresh_in_uhz); 1050 in_out_vrr->adjust.v_total_max = 1051 calc_v_total_from_refresh(stream, 1052 in_out_vrr->min_refresh_in_uhz); 1053 } 1054 } 1055 1056 /* If in fullscreen freesync mode or in video, do not program 1057 * static screen ramp values 1058 */ 1059 if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) 1060 in_out_vrr->fixed.ramping_active = false; 1061 1062 /* Gradual Static Screen Ramping Logic */ 1063 /* Execute if ramp is active and user enabled freesync static screen*/ 1064 if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED && 1065 in_out_vrr->fixed.ramping_active) { 1066 update_v_total_for_static_ramp( 1067 core_freesync, stream, in_out_vrr); 1068 } 1069 } 1070 1071 void mod_freesync_get_settings(struct mod_freesync *mod_freesync, 1072 const struct mod_vrr_params *vrr, 1073 unsigned int *v_total_min, unsigned int *v_total_max, 1074 unsigned int *event_triggers, 1075 unsigned int *window_min, unsigned int *window_max, 1076 unsigned int *lfc_mid_point_in_us, 1077 unsigned int *inserted_frames, 1078 unsigned int *inserted_duration_in_us) 1079 { 1080 if (mod_freesync == NULL) 1081 return; 1082 1083 if (vrr->supported) { 1084 *v_total_min = vrr->adjust.v_total_min; 1085 *v_total_max = vrr->adjust.v_total_max; 1086 *event_triggers = 0; 1087 *lfc_mid_point_in_us = vrr->btr.mid_point_in_us; 1088 *inserted_frames = vrr->btr.frames_to_insert; 1089 *inserted_duration_in_us = vrr->btr.inserted_duration_in_us; 1090 } 1091 } 1092 1093 unsigned long long mod_freesync_calc_nominal_field_rate( 1094 const struct dc_stream_state *stream) 1095 { 1096 unsigned long long nominal_field_rate_in_uhz = 0; 1097 unsigned int total = stream->timing.h_total * stream->timing.v_total; 1098 1099 /* Calculate nominal field rate for stream, rounded up to nearest integer */ 1100 nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz; 1101 nominal_field_rate_in_uhz *= 100000000ULL; 1102 1103 nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz, total); 1104 1105 return nominal_field_rate_in_uhz; 1106 } 1107 1108 bool mod_freesync_is_valid_range(struct mod_freesync *mod_freesync, 1109 const struct dc_stream_state *stream, 1110 uint32_t min_refresh_cap_in_uhz, 1111 uint32_t max_refresh_cap_in_uhz, 1112 uint32_t min_refresh_request_in_uhz, 1113 uint32_t max_refresh_request_in_uhz) 1114 { 1115 /* Calculate nominal field rate for stream */ 1116 unsigned long long nominal_field_rate_in_uhz = 1117 mod_freesync_calc_nominal_field_rate(stream); 1118 1119 /* Typically nominal refresh calculated can have some fractional part. 1120 * Allow for some rounding error of actual video timing by taking floor 1121 * of caps and request. Round the nominal refresh rate. 1122 * 1123 * Dividing will convert everything to units in Hz although input 1124 * variable name is in uHz! 1125 * 1126 * Also note, this takes care of rounding error on the nominal refresh 1127 * so by rounding error we only expect it to be off by a small amount, 1128 * such as < 0.1 Hz. i.e. 143.9xxx or 144.1xxx. 1129 * 1130 * Example 1. Caps Min = 40 Hz, Max = 144 Hz 1131 * Request Min = 40 Hz, Max = 144 Hz 1132 * Nominal = 143.5x Hz rounded to 144 Hz 1133 * This function should allow this as valid request 1134 * 1135 * Example 2. Caps Min = 40 Hz, Max = 144 Hz 1136 * Request Min = 40 Hz, Max = 144 Hz 1137 * Nominal = 144.4x Hz rounded to 144 Hz 1138 * This function should allow this as valid request 1139 * 1140 * Example 3. Caps Min = 40 Hz, Max = 144 Hz 1141 * Request Min = 40 Hz, Max = 144 Hz 1142 * Nominal = 120.xx Hz rounded to 120 Hz 1143 * This function should return NOT valid since the requested 1144 * max is greater than current timing's nominal 1145 * 1146 * Example 4. Caps Min = 40 Hz, Max = 120 Hz 1147 * Request Min = 40 Hz, Max = 120 Hz 1148 * Nominal = 144.xx Hz rounded to 144 Hz 1149 * This function should return NOT valid since the nominal 1150 * is greater than the capability's max refresh 1151 */ 1152 nominal_field_rate_in_uhz = 1153 div_u64(nominal_field_rate_in_uhz + 500000, 1000000); 1154 min_refresh_cap_in_uhz /= 1000000; 1155 max_refresh_cap_in_uhz /= 1000000; 1156 min_refresh_request_in_uhz /= 1000000; 1157 max_refresh_request_in_uhz /= 1000000; 1158 1159 // Check nominal is within range 1160 if (nominal_field_rate_in_uhz > max_refresh_cap_in_uhz || 1161 nominal_field_rate_in_uhz < min_refresh_cap_in_uhz) 1162 return false; 1163 1164 // If nominal is less than max, limit the max allowed refresh rate 1165 if (nominal_field_rate_in_uhz < max_refresh_cap_in_uhz) 1166 max_refresh_cap_in_uhz = nominal_field_rate_in_uhz; 1167 1168 // Don't allow min > max 1169 if (min_refresh_request_in_uhz > max_refresh_request_in_uhz) 1170 return false; 1171 1172 // Check min is within range 1173 if (min_refresh_request_in_uhz > max_refresh_cap_in_uhz || 1174 min_refresh_request_in_uhz < min_refresh_cap_in_uhz) 1175 return false; 1176 1177 // Check max is within range 1178 if (max_refresh_request_in_uhz > max_refresh_cap_in_uhz || 1179 max_refresh_request_in_uhz < min_refresh_cap_in_uhz) 1180 return false; 1181 1182 // For variable range, check for at least 10 Hz range 1183 if ((max_refresh_request_in_uhz != min_refresh_request_in_uhz) && 1184 (max_refresh_request_in_uhz - min_refresh_request_in_uhz < 10)) 1185 return false; 1186 1187 return true; 1188 } 1189 1190