1 /* 2 * Copyright © 2012-2014 Intel Corporation 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 (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eugeni Dodonov <eugeni.dodonov@intel.com> 25 * Daniel Vetter <daniel.vetter@ffwll.ch> 26 * 27 */ 28 29 #include <linux/pm_runtime.h> 30 #include <linux/vgaarb.h> 31 32 #include "i915_drv.h" 33 #include "intel_drv.h" 34 35 /** 36 * DOC: runtime pm 37 * 38 * The i915 driver supports dynamic enabling and disabling of entire hardware 39 * blocks at runtime. This is especially important on the display side where 40 * software is supposed to control many power gates manually on recent hardware, 41 * since on the GT side a lot of the power management is done by the hardware. 42 * But even there some manual control at the device level is required. 43 * 44 * Since i915 supports a diverse set of platforms with a unified codebase and 45 * hardware engineers just love to shuffle functionality around between power 46 * domains there's a sizeable amount of indirection required. This file provides 47 * generic functions to the driver for grabbing and releasing references for 48 * abstract power domains. It then maps those to the actual power wells 49 * present for a given platform. 50 */ 51 52 #define GEN9_ENABLE_DC5(dev) 0 53 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev) 54 55 #define for_each_power_well(i, power_well, domain_mask, power_domains) \ 56 for (i = 0; \ 57 i < (power_domains)->power_well_count && \ 58 ((power_well) = &(power_domains)->power_wells[i]); \ 59 i++) \ 60 if ((power_well)->domains & (domain_mask)) 61 62 #define for_each_power_well_rev(i, power_well, domain_mask, power_domains) \ 63 for (i = (power_domains)->power_well_count - 1; \ 64 i >= 0 && ((power_well) = &(power_domains)->power_wells[i]);\ 65 i--) \ 66 if ((power_well)->domains & (domain_mask)) 67 68 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv, 69 int power_well_id); 70 71 static void intel_power_well_enable(struct drm_i915_private *dev_priv, 72 struct i915_power_well *power_well) 73 { 74 DRM_DEBUG_KMS("enabling %s\n", power_well->name); 75 power_well->ops->enable(dev_priv, power_well); 76 power_well->hw_enabled = true; 77 } 78 79 static void intel_power_well_disable(struct drm_i915_private *dev_priv, 80 struct i915_power_well *power_well) 81 { 82 DRM_DEBUG_KMS("disabling %s\n", power_well->name); 83 power_well->hw_enabled = false; 84 power_well->ops->disable(dev_priv, power_well); 85 } 86 87 /* 88 * We should only use the power well if we explicitly asked the hardware to 89 * enable it, so check if it's enabled and also check if we've requested it to 90 * be enabled. 91 */ 92 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv, 93 struct i915_power_well *power_well) 94 { 95 return I915_READ(HSW_PWR_WELL_DRIVER) == 96 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED); 97 } 98 99 /** 100 * __intel_display_power_is_enabled - unlocked check for a power domain 101 * @dev_priv: i915 device instance 102 * @domain: power domain to check 103 * 104 * This is the unlocked version of intel_display_power_is_enabled() and should 105 * only be used from error capture and recovery code where deadlocks are 106 * possible. 107 * 108 * Returns: 109 * True when the power domain is enabled, false otherwise. 110 */ 111 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv, 112 enum intel_display_power_domain domain) 113 { 114 struct i915_power_domains *power_domains; 115 struct i915_power_well *power_well; 116 bool is_enabled; 117 int i; 118 119 if (dev_priv->pm.suspended) 120 return false; 121 122 power_domains = &dev_priv->power_domains; 123 124 is_enabled = true; 125 126 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) { 127 if (power_well->always_on) 128 continue; 129 130 if (!power_well->hw_enabled) { 131 is_enabled = false; 132 break; 133 } 134 } 135 136 return is_enabled; 137 } 138 139 /** 140 * intel_display_power_is_enabled - check for a power domain 141 * @dev_priv: i915 device instance 142 * @domain: power domain to check 143 * 144 * This function can be used to check the hw power domain state. It is mostly 145 * used in hardware state readout functions. Everywhere else code should rely 146 * upon explicit power domain reference counting to ensure that the hardware 147 * block is powered up before accessing it. 148 * 149 * Callers must hold the relevant modesetting locks to ensure that concurrent 150 * threads can't disable the power well while the caller tries to read a few 151 * registers. 152 * 153 * Returns: 154 * True when the power domain is enabled, false otherwise. 155 */ 156 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv, 157 enum intel_display_power_domain domain) 158 { 159 struct i915_power_domains *power_domains; 160 bool ret; 161 162 power_domains = &dev_priv->power_domains; 163 164 mutex_lock(&power_domains->lock); 165 ret = __intel_display_power_is_enabled(dev_priv, domain); 166 mutex_unlock(&power_domains->lock); 167 168 return ret; 169 } 170 171 /** 172 * intel_display_set_init_power - set the initial power domain state 173 * @dev_priv: i915 device instance 174 * @enable: whether to enable or disable the initial power domain state 175 * 176 * For simplicity our driver load/unload and system suspend/resume code assumes 177 * that all power domains are always enabled. This functions controls the state 178 * of this little hack. While the initial power domain state is enabled runtime 179 * pm is effectively disabled. 180 */ 181 void intel_display_set_init_power(struct drm_i915_private *dev_priv, 182 bool enable) 183 { 184 if (dev_priv->power_domains.init_power_on == enable) 185 return; 186 187 if (enable) 188 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); 189 else 190 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT); 191 192 dev_priv->power_domains.init_power_on = enable; 193 } 194 195 /* 196 * Starting with Haswell, we have a "Power Down Well" that can be turned off 197 * when not needed anymore. We have 4 registers that can request the power well 198 * to be enabled, and it will only be disabled if none of the registers is 199 * requesting it to be enabled. 200 */ 201 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv) 202 { 203 struct drm_device *dev = dev_priv->dev; 204 205 /* 206 * After we re-enable the power well, if we touch VGA register 0x3d5 207 * we'll get unclaimed register interrupts. This stops after we write 208 * anything to the VGA MSR register. The vgacon module uses this 209 * register all the time, so if we unbind our driver and, as a 210 * consequence, bind vgacon, we'll get stuck in an infinite loop at 211 * console_unlock(). So make here we touch the VGA MSR register, making 212 * sure vgacon can keep working normally without triggering interrupts 213 * and error messages. 214 */ 215 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); 216 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE); 217 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); 218 219 if (IS_BROADWELL(dev)) 220 gen8_irq_power_well_post_enable(dev_priv, 221 1 << PIPE_C | 1 << PIPE_B); 222 } 223 224 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv, 225 struct i915_power_well *power_well) 226 { 227 struct drm_device *dev = dev_priv->dev; 228 229 /* 230 * After we re-enable the power well, if we touch VGA register 0x3d5 231 * we'll get unclaimed register interrupts. This stops after we write 232 * anything to the VGA MSR register. The vgacon module uses this 233 * register all the time, so if we unbind our driver and, as a 234 * consequence, bind vgacon, we'll get stuck in an infinite loop at 235 * console_unlock(). So make here we touch the VGA MSR register, making 236 * sure vgacon can keep working normally without triggering interrupts 237 * and error messages. 238 */ 239 if (power_well->data == SKL_DISP_PW_2) { 240 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); 241 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE); 242 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); 243 244 gen8_irq_power_well_post_enable(dev_priv, 245 1 << PIPE_C | 1 << PIPE_B); 246 } 247 248 if (power_well->data == SKL_DISP_PW_1) { 249 if (!dev_priv->power_domains.initializing) 250 intel_prepare_ddi(dev); 251 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A); 252 } 253 } 254 255 static void hsw_set_power_well(struct drm_i915_private *dev_priv, 256 struct i915_power_well *power_well, bool enable) 257 { 258 bool is_enabled, enable_requested; 259 uint32_t tmp; 260 261 tmp = I915_READ(HSW_PWR_WELL_DRIVER); 262 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED; 263 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST; 264 265 if (enable) { 266 if (!enable_requested) 267 I915_WRITE(HSW_PWR_WELL_DRIVER, 268 HSW_PWR_WELL_ENABLE_REQUEST); 269 270 if (!is_enabled) { 271 DRM_DEBUG_KMS("Enabling power well\n"); 272 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) & 273 HSW_PWR_WELL_STATE_ENABLED), 20)) 274 DRM_ERROR("Timeout enabling power well\n"); 275 hsw_power_well_post_enable(dev_priv); 276 } 277 278 } else { 279 if (enable_requested) { 280 I915_WRITE(HSW_PWR_WELL_DRIVER, 0); 281 POSTING_READ(HSW_PWR_WELL_DRIVER); 282 DRM_DEBUG_KMS("Requesting to disable the power well\n"); 283 } 284 } 285 } 286 287 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \ 288 BIT(POWER_DOMAIN_TRANSCODER_A) | \ 289 BIT(POWER_DOMAIN_PIPE_B) | \ 290 BIT(POWER_DOMAIN_TRANSCODER_B) | \ 291 BIT(POWER_DOMAIN_PIPE_C) | \ 292 BIT(POWER_DOMAIN_TRANSCODER_C) | \ 293 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \ 294 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \ 295 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 296 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 297 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 298 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 299 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 300 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 301 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \ 302 BIT(POWER_DOMAIN_AUX_B) | \ 303 BIT(POWER_DOMAIN_AUX_C) | \ 304 BIT(POWER_DOMAIN_AUX_D) | \ 305 BIT(POWER_DOMAIN_AUDIO) | \ 306 BIT(POWER_DOMAIN_VGA) | \ 307 BIT(POWER_DOMAIN_INIT)) 308 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \ 309 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 310 BIT(POWER_DOMAIN_PLLS) | \ 311 BIT(POWER_DOMAIN_PIPE_A) | \ 312 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 313 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \ 314 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 315 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 316 BIT(POWER_DOMAIN_AUX_A) | \ 317 BIT(POWER_DOMAIN_INIT)) 318 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \ 319 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 320 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 321 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \ 322 BIT(POWER_DOMAIN_INIT)) 323 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \ 324 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 325 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 326 BIT(POWER_DOMAIN_INIT)) 327 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \ 328 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 329 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 330 BIT(POWER_DOMAIN_INIT)) 331 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \ 332 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 333 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 334 BIT(POWER_DOMAIN_INIT)) 335 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS ( \ 336 SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 337 BIT(POWER_DOMAIN_PLLS) | \ 338 BIT(POWER_DOMAIN_INIT)) 339 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \ 340 (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 341 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 342 SKL_DISPLAY_DDI_A_E_POWER_DOMAINS | \ 343 SKL_DISPLAY_DDI_B_POWER_DOMAINS | \ 344 SKL_DISPLAY_DDI_C_POWER_DOMAINS | \ 345 SKL_DISPLAY_DDI_D_POWER_DOMAINS | \ 346 SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) | \ 347 BIT(POWER_DOMAIN_INIT)) 348 349 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \ 350 BIT(POWER_DOMAIN_TRANSCODER_A) | \ 351 BIT(POWER_DOMAIN_PIPE_B) | \ 352 BIT(POWER_DOMAIN_TRANSCODER_B) | \ 353 BIT(POWER_DOMAIN_PIPE_C) | \ 354 BIT(POWER_DOMAIN_TRANSCODER_C) | \ 355 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \ 356 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \ 357 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 358 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 359 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 360 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 361 BIT(POWER_DOMAIN_AUX_B) | \ 362 BIT(POWER_DOMAIN_AUX_C) | \ 363 BIT(POWER_DOMAIN_AUDIO) | \ 364 BIT(POWER_DOMAIN_VGA) | \ 365 BIT(POWER_DOMAIN_INIT)) 366 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \ 367 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 368 BIT(POWER_DOMAIN_PIPE_A) | \ 369 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 370 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \ 371 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 372 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 373 BIT(POWER_DOMAIN_AUX_A) | \ 374 BIT(POWER_DOMAIN_PLLS) | \ 375 BIT(POWER_DOMAIN_INIT)) 376 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \ 377 (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 378 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \ 379 BIT(POWER_DOMAIN_INIT)) 380 381 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv) 382 { 383 struct drm_device *dev = dev_priv->dev; 384 385 WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n"); 386 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), 387 "DC9 already programmed to be enabled.\n"); 388 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, 389 "DC5 still not disabled to enable DC9.\n"); 390 WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n"); 391 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); 392 393 /* 394 * TODO: check for the following to verify the conditions to enter DC9 395 * state are satisfied: 396 * 1] Check relevant display engine registers to verify if mode set 397 * disable sequence was followed. 398 * 2] Check if display uninitialize sequence is initialized. 399 */ 400 } 401 402 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv) 403 { 404 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); 405 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), 406 "DC9 already programmed to be disabled.\n"); 407 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, 408 "DC5 still not disabled.\n"); 409 410 /* 411 * TODO: check for the following to verify DC9 state was indeed 412 * entered before programming to disable it: 413 * 1] Check relevant display engine registers to verify if mode 414 * set disable sequence was followed. 415 * 2] Check if display uninitialize sequence is initialized. 416 */ 417 } 418 419 void bxt_enable_dc9(struct drm_i915_private *dev_priv) 420 { 421 uint32_t val; 422 423 assert_can_enable_dc9(dev_priv); 424 425 DRM_DEBUG_KMS("Enabling DC9\n"); 426 427 val = I915_READ(DC_STATE_EN); 428 val |= DC_STATE_EN_DC9; 429 I915_WRITE(DC_STATE_EN, val); 430 POSTING_READ(DC_STATE_EN); 431 } 432 433 void bxt_disable_dc9(struct drm_i915_private *dev_priv) 434 { 435 uint32_t val; 436 437 assert_can_disable_dc9(dev_priv); 438 439 DRM_DEBUG_KMS("Disabling DC9\n"); 440 441 val = I915_READ(DC_STATE_EN); 442 val &= ~DC_STATE_EN_DC9; 443 I915_WRITE(DC_STATE_EN, val); 444 POSTING_READ(DC_STATE_EN); 445 } 446 447 static void gen9_set_dc_state_debugmask_memory_up( 448 struct drm_i915_private *dev_priv) 449 { 450 uint32_t val; 451 452 /* The below bit doesn't need to be cleared ever afterwards */ 453 val = I915_READ(DC_STATE_DEBUG); 454 if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) { 455 val |= DC_STATE_DEBUG_MASK_MEMORY_UP; 456 I915_WRITE(DC_STATE_DEBUG, val); 457 POSTING_READ(DC_STATE_DEBUG); 458 } 459 } 460 461 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv) 462 { 463 struct drm_device *dev = dev_priv->dev; 464 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv, 465 SKL_DISP_PW_2); 466 467 WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n"); 468 WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n"); 469 WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n"); 470 471 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5), 472 "DC5 already programmed to be enabled.\n"); 473 WARN(dev_priv->pm.suspended, 474 "DC5 cannot be enabled, if platform is runtime-suspended.\n"); 475 476 assert_csr_loaded(dev_priv); 477 } 478 479 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv) 480 { 481 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv, 482 SKL_DISP_PW_2); 483 /* 484 * During initialization, the firmware may not be loaded yet. 485 * We still want to make sure that the DC enabling flag is cleared. 486 */ 487 if (dev_priv->power_domains.initializing) 488 return; 489 490 WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n"); 491 WARN(dev_priv->pm.suspended, 492 "Disabling of DC5 while platform is runtime-suspended should never happen.\n"); 493 } 494 495 static void gen9_enable_dc5(struct drm_i915_private *dev_priv) 496 { 497 uint32_t val; 498 499 assert_can_enable_dc5(dev_priv); 500 501 DRM_DEBUG_KMS("Enabling DC5\n"); 502 503 gen9_set_dc_state_debugmask_memory_up(dev_priv); 504 505 val = I915_READ(DC_STATE_EN); 506 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK; 507 val |= DC_STATE_EN_UPTO_DC5; 508 I915_WRITE(DC_STATE_EN, val); 509 POSTING_READ(DC_STATE_EN); 510 } 511 512 static void gen9_disable_dc5(struct drm_i915_private *dev_priv) 513 { 514 uint32_t val; 515 516 assert_can_disable_dc5(dev_priv); 517 518 DRM_DEBUG_KMS("Disabling DC5\n"); 519 520 val = I915_READ(DC_STATE_EN); 521 val &= ~DC_STATE_EN_UPTO_DC5; 522 I915_WRITE(DC_STATE_EN, val); 523 POSTING_READ(DC_STATE_EN); 524 } 525 526 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv) 527 { 528 struct drm_device *dev = dev_priv->dev; 529 530 WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC6.\n"); 531 WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n"); 532 WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE, 533 "Backlight is not disabled.\n"); 534 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6), 535 "DC6 already programmed to be enabled.\n"); 536 537 assert_csr_loaded(dev_priv); 538 } 539 540 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv) 541 { 542 /* 543 * During initialization, the firmware may not be loaded yet. 544 * We still want to make sure that the DC enabling flag is cleared. 545 */ 546 if (dev_priv->power_domains.initializing) 547 return; 548 549 assert_csr_loaded(dev_priv); 550 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6), 551 "DC6 already programmed to be disabled.\n"); 552 } 553 554 static void skl_enable_dc6(struct drm_i915_private *dev_priv) 555 { 556 uint32_t val; 557 558 assert_can_enable_dc6(dev_priv); 559 560 DRM_DEBUG_KMS("Enabling DC6\n"); 561 562 gen9_set_dc_state_debugmask_memory_up(dev_priv); 563 564 val = I915_READ(DC_STATE_EN); 565 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK; 566 val |= DC_STATE_EN_UPTO_DC6; 567 I915_WRITE(DC_STATE_EN, val); 568 POSTING_READ(DC_STATE_EN); 569 } 570 571 static void skl_disable_dc6(struct drm_i915_private *dev_priv) 572 { 573 uint32_t val; 574 575 assert_can_disable_dc6(dev_priv); 576 577 DRM_DEBUG_KMS("Disabling DC6\n"); 578 579 val = I915_READ(DC_STATE_EN); 580 val &= ~DC_STATE_EN_UPTO_DC6; 581 I915_WRITE(DC_STATE_EN, val); 582 POSTING_READ(DC_STATE_EN); 583 } 584 585 static void skl_set_power_well(struct drm_i915_private *dev_priv, 586 struct i915_power_well *power_well, bool enable) 587 { 588 struct drm_device *dev = dev_priv->dev; 589 uint32_t tmp, fuse_status; 590 uint32_t req_mask, state_mask; 591 bool is_enabled, enable_requested, check_fuse_status = false; 592 593 tmp = I915_READ(HSW_PWR_WELL_DRIVER); 594 fuse_status = I915_READ(SKL_FUSE_STATUS); 595 596 switch (power_well->data) { 597 case SKL_DISP_PW_1: 598 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 599 SKL_FUSE_PG0_DIST_STATUS), 1)) { 600 DRM_ERROR("PG0 not enabled\n"); 601 return; 602 } 603 break; 604 case SKL_DISP_PW_2: 605 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) { 606 DRM_ERROR("PG1 in disabled state\n"); 607 return; 608 } 609 break; 610 case SKL_DISP_PW_DDI_A_E: 611 case SKL_DISP_PW_DDI_B: 612 case SKL_DISP_PW_DDI_C: 613 case SKL_DISP_PW_DDI_D: 614 case SKL_DISP_PW_MISC_IO: 615 break; 616 default: 617 WARN(1, "Unknown power well %lu\n", power_well->data); 618 return; 619 } 620 621 req_mask = SKL_POWER_WELL_REQ(power_well->data); 622 enable_requested = tmp & req_mask; 623 state_mask = SKL_POWER_WELL_STATE(power_well->data); 624 is_enabled = tmp & state_mask; 625 626 if (enable) { 627 if (!enable_requested) { 628 WARN((tmp & state_mask) && 629 !I915_READ(HSW_PWR_WELL_BIOS), 630 "Invalid for power well status to be enabled, unless done by the BIOS, \ 631 when request is to disable!\n"); 632 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) && 633 power_well->data == SKL_DISP_PW_2) { 634 if (SKL_ENABLE_DC6(dev)) { 635 skl_disable_dc6(dev_priv); 636 /* 637 * DDI buffer programming unnecessary during driver-load/resume 638 * as it's already done during modeset initialization then. 639 * It's also invalid here as encoder list is still uninitialized. 640 */ 641 if (!dev_priv->power_domains.initializing) 642 intel_prepare_ddi(dev); 643 } else { 644 gen9_disable_dc5(dev_priv); 645 } 646 } 647 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask); 648 } 649 650 if (!is_enabled) { 651 DRM_DEBUG_KMS("Enabling %s\n", power_well->name); 652 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) & 653 state_mask), 1)) 654 DRM_ERROR("%s enable timeout\n", 655 power_well->name); 656 check_fuse_status = true; 657 } 658 } else { 659 if (enable_requested) { 660 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask); 661 POSTING_READ(HSW_PWR_WELL_DRIVER); 662 DRM_DEBUG_KMS("Disabling %s\n", power_well->name); 663 664 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) && 665 power_well->data == SKL_DISP_PW_2) { 666 enum csr_state state; 667 /* TODO: wait for a completion event or 668 * similar here instead of busy 669 * waiting using wait_for function. 670 */ 671 wait_for((state = intel_csr_load_status_get(dev_priv)) != 672 FW_UNINITIALIZED, 1000); 673 if (state != FW_LOADED) 674 DRM_ERROR("CSR firmware not ready (%d)\n", 675 state); 676 else 677 if (SKL_ENABLE_DC6(dev)) 678 skl_enable_dc6(dev_priv); 679 else 680 gen9_enable_dc5(dev_priv); 681 } 682 } 683 } 684 685 if (check_fuse_status) { 686 if (power_well->data == SKL_DISP_PW_1) { 687 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 688 SKL_FUSE_PG1_DIST_STATUS), 1)) 689 DRM_ERROR("PG1 distributing status timeout\n"); 690 } else if (power_well->data == SKL_DISP_PW_2) { 691 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 692 SKL_FUSE_PG2_DIST_STATUS), 1)) 693 DRM_ERROR("PG2 distributing status timeout\n"); 694 } 695 } 696 697 if (enable && !is_enabled) 698 skl_power_well_post_enable(dev_priv, power_well); 699 } 700 701 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv, 702 struct i915_power_well *power_well) 703 { 704 hsw_set_power_well(dev_priv, power_well, power_well->count > 0); 705 706 /* 707 * We're taking over the BIOS, so clear any requests made by it since 708 * the driver is in charge now. 709 */ 710 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST) 711 I915_WRITE(HSW_PWR_WELL_BIOS, 0); 712 } 713 714 static void hsw_power_well_enable(struct drm_i915_private *dev_priv, 715 struct i915_power_well *power_well) 716 { 717 hsw_set_power_well(dev_priv, power_well, true); 718 } 719 720 static void hsw_power_well_disable(struct drm_i915_private *dev_priv, 721 struct i915_power_well *power_well) 722 { 723 hsw_set_power_well(dev_priv, power_well, false); 724 } 725 726 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv, 727 struct i915_power_well *power_well) 728 { 729 uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) | 730 SKL_POWER_WELL_STATE(power_well->data); 731 732 return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask; 733 } 734 735 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv, 736 struct i915_power_well *power_well) 737 { 738 skl_set_power_well(dev_priv, power_well, power_well->count > 0); 739 740 /* Clear any request made by BIOS as driver is taking over */ 741 I915_WRITE(HSW_PWR_WELL_BIOS, 0); 742 } 743 744 static void skl_power_well_enable(struct drm_i915_private *dev_priv, 745 struct i915_power_well *power_well) 746 { 747 skl_set_power_well(dev_priv, power_well, true); 748 } 749 750 static void skl_power_well_disable(struct drm_i915_private *dev_priv, 751 struct i915_power_well *power_well) 752 { 753 skl_set_power_well(dev_priv, power_well, false); 754 } 755 756 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv, 757 struct i915_power_well *power_well) 758 { 759 } 760 761 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv, 762 struct i915_power_well *power_well) 763 { 764 return true; 765 } 766 767 static void vlv_set_power_well(struct drm_i915_private *dev_priv, 768 struct i915_power_well *power_well, bool enable) 769 { 770 enum punit_power_well power_well_id = power_well->data; 771 u32 mask; 772 u32 state; 773 u32 ctrl; 774 775 mask = PUNIT_PWRGT_MASK(power_well_id); 776 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) : 777 PUNIT_PWRGT_PWR_GATE(power_well_id); 778 779 mutex_lock(&dev_priv->rps.hw_lock); 780 781 #define COND \ 782 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state) 783 784 if (COND) 785 goto out; 786 787 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL); 788 ctrl &= ~mask; 789 ctrl |= state; 790 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl); 791 792 if (wait_for(COND, 100)) 793 DRM_ERROR("timeout setting power well state %08x (%08x)\n", 794 state, 795 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL)); 796 797 #undef COND 798 799 out: 800 mutex_unlock(&dev_priv->rps.hw_lock); 801 } 802 803 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv, 804 struct i915_power_well *power_well) 805 { 806 vlv_set_power_well(dev_priv, power_well, power_well->count > 0); 807 } 808 809 static void vlv_power_well_enable(struct drm_i915_private *dev_priv, 810 struct i915_power_well *power_well) 811 { 812 vlv_set_power_well(dev_priv, power_well, true); 813 } 814 815 static void vlv_power_well_disable(struct drm_i915_private *dev_priv, 816 struct i915_power_well *power_well) 817 { 818 vlv_set_power_well(dev_priv, power_well, false); 819 } 820 821 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv, 822 struct i915_power_well *power_well) 823 { 824 int power_well_id = power_well->data; 825 bool enabled = false; 826 u32 mask; 827 u32 state; 828 u32 ctrl; 829 830 mask = PUNIT_PWRGT_MASK(power_well_id); 831 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id); 832 833 mutex_lock(&dev_priv->rps.hw_lock); 834 835 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask; 836 /* 837 * We only ever set the power-on and power-gate states, anything 838 * else is unexpected. 839 */ 840 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) && 841 state != PUNIT_PWRGT_PWR_GATE(power_well_id)); 842 if (state == ctrl) 843 enabled = true; 844 845 /* 846 * A transient state at this point would mean some unexpected party 847 * is poking at the power controls too. 848 */ 849 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask; 850 WARN_ON(ctrl != state); 851 852 mutex_unlock(&dev_priv->rps.hw_lock); 853 854 return enabled; 855 } 856 857 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv) 858 { 859 860 spin_lock_irq(&dev_priv->irq_lock); 861 valleyview_enable_display_irqs(dev_priv); 862 spin_unlock_irq(&dev_priv->irq_lock); 863 864 /* 865 * During driver initialization/resume we can avoid restoring the 866 * part of the HW/SW state that will be inited anyway explicitly. 867 */ 868 if (dev_priv->power_domains.initializing) 869 return; 870 871 intel_hpd_init(dev_priv); 872 873 i915_redisable_vga_power_on(dev_priv->dev); 874 } 875 876 static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv) 877 { 878 spin_lock_irq(&dev_priv->irq_lock); 879 valleyview_disable_display_irqs(dev_priv); 880 spin_unlock_irq(&dev_priv->irq_lock); 881 882 vlv_power_sequencer_reset(dev_priv); 883 } 884 885 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv, 886 struct i915_power_well *power_well) 887 { 888 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D); 889 890 vlv_set_power_well(dev_priv, power_well, true); 891 892 vlv_display_power_well_init(dev_priv); 893 } 894 895 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv, 896 struct i915_power_well *power_well) 897 { 898 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D); 899 900 vlv_display_power_well_deinit(dev_priv); 901 902 vlv_set_power_well(dev_priv, power_well, false); 903 } 904 905 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv, 906 struct i915_power_well *power_well) 907 { 908 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC); 909 910 /* 911 * Enable the CRI clock source so we can get at the 912 * display and the reference clock for VGA 913 * hotplug / manual detection. 914 */ 915 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS | 916 DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV); 917 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */ 918 919 vlv_set_power_well(dev_priv, power_well, true); 920 921 /* 922 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx - 923 * 6. De-assert cmn_reset/side_reset. Same as VLV X0. 924 * a. GUnit 0x2110 bit[0] set to 1 (def 0) 925 * b. The other bits such as sfr settings / modesel may all 926 * be set to 0. 927 * 928 * This should only be done on init and resume from S3 with 929 * both PLLs disabled, or we risk losing DPIO and PLL 930 * synchronization. 931 */ 932 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST); 933 } 934 935 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv, 936 struct i915_power_well *power_well) 937 { 938 enum pipe pipe; 939 940 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC); 941 942 for_each_pipe(dev_priv, pipe) 943 assert_pll_disabled(dev_priv, pipe); 944 945 /* Assert common reset */ 946 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST); 947 948 vlv_set_power_well(dev_priv, power_well, false); 949 } 950 951 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv, 952 struct i915_power_well *power_well) 953 { 954 enum dpio_phy phy; 955 956 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC && 957 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D); 958 959 /* 960 * Enable the CRI clock source so we can get at the 961 * display and the reference clock for VGA 962 * hotplug / manual detection. 963 */ 964 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) { 965 phy = DPIO_PHY0; 966 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS | 967 DPLL_REF_CLK_ENABLE_VLV); 968 I915_WRITE(DPLL(PIPE_B), I915_READ(DPLL(PIPE_B)) | DPLL_VGA_MODE_DIS | 969 DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV); 970 } else { 971 phy = DPIO_PHY1; 972 I915_WRITE(DPLL(PIPE_C), I915_READ(DPLL(PIPE_C)) | DPLL_VGA_MODE_DIS | 973 DPLL_REF_CLK_ENABLE_VLV | DPLL_INTEGRATED_CRI_CLK_VLV); 974 } 975 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */ 976 vlv_set_power_well(dev_priv, power_well, true); 977 978 /* Poll for phypwrgood signal */ 979 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1)) 980 DRM_ERROR("Display PHY %d is not power up\n", phy); 981 982 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy); 983 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 984 } 985 986 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv, 987 struct i915_power_well *power_well) 988 { 989 enum dpio_phy phy; 990 991 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC && 992 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D); 993 994 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) { 995 phy = DPIO_PHY0; 996 assert_pll_disabled(dev_priv, PIPE_A); 997 assert_pll_disabled(dev_priv, PIPE_B); 998 } else { 999 phy = DPIO_PHY1; 1000 assert_pll_disabled(dev_priv, PIPE_C); 1001 } 1002 1003 dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy); 1004 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 1005 1006 vlv_set_power_well(dev_priv, power_well, false); 1007 } 1008 1009 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv, 1010 struct i915_power_well *power_well) 1011 { 1012 enum pipe pipe = power_well->data; 1013 bool enabled; 1014 u32 state, ctrl; 1015 1016 mutex_lock(&dev_priv->rps.hw_lock); 1017 1018 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe); 1019 /* 1020 * We only ever set the power-on and power-gate states, anything 1021 * else is unexpected. 1022 */ 1023 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe)); 1024 enabled = state == DP_SSS_PWR_ON(pipe); 1025 1026 /* 1027 * A transient state at this point would mean some unexpected party 1028 * is poking at the power controls too. 1029 */ 1030 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe); 1031 WARN_ON(ctrl << 16 != state); 1032 1033 mutex_unlock(&dev_priv->rps.hw_lock); 1034 1035 return enabled; 1036 } 1037 1038 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv, 1039 struct i915_power_well *power_well, 1040 bool enable) 1041 { 1042 enum pipe pipe = power_well->data; 1043 u32 state; 1044 u32 ctrl; 1045 1046 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe); 1047 1048 mutex_lock(&dev_priv->rps.hw_lock); 1049 1050 #define COND \ 1051 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state) 1052 1053 if (COND) 1054 goto out; 1055 1056 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); 1057 ctrl &= ~DP_SSC_MASK(pipe); 1058 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe); 1059 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl); 1060 1061 if (wait_for(COND, 100)) 1062 DRM_ERROR("timeout setting power well state %08x (%08x)\n", 1063 state, 1064 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ)); 1065 1066 #undef COND 1067 1068 out: 1069 mutex_unlock(&dev_priv->rps.hw_lock); 1070 } 1071 1072 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv, 1073 struct i915_power_well *power_well) 1074 { 1075 WARN_ON_ONCE(power_well->data != PIPE_A); 1076 1077 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0); 1078 } 1079 1080 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv, 1081 struct i915_power_well *power_well) 1082 { 1083 WARN_ON_ONCE(power_well->data != PIPE_A); 1084 1085 chv_set_pipe_power_well(dev_priv, power_well, true); 1086 1087 vlv_display_power_well_init(dev_priv); 1088 } 1089 1090 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv, 1091 struct i915_power_well *power_well) 1092 { 1093 WARN_ON_ONCE(power_well->data != PIPE_A); 1094 1095 vlv_display_power_well_deinit(dev_priv); 1096 1097 chv_set_pipe_power_well(dev_priv, power_well, false); 1098 } 1099 1100 /** 1101 * intel_display_power_get - grab a power domain reference 1102 * @dev_priv: i915 device instance 1103 * @domain: power domain to reference 1104 * 1105 * This function grabs a power domain reference for @domain and ensures that the 1106 * power domain and all its parents are powered up. Therefore users should only 1107 * grab a reference to the innermost power domain they need. 1108 * 1109 * Any power domain reference obtained by this function must have a symmetric 1110 * call to intel_display_power_put() to release the reference again. 1111 */ 1112 void intel_display_power_get(struct drm_i915_private *dev_priv, 1113 enum intel_display_power_domain domain) 1114 { 1115 struct i915_power_domains *power_domains; 1116 struct i915_power_well *power_well; 1117 int i; 1118 1119 intel_runtime_pm_get(dev_priv); 1120 1121 power_domains = &dev_priv->power_domains; 1122 1123 mutex_lock(&power_domains->lock); 1124 1125 for_each_power_well(i, power_well, BIT(domain), power_domains) { 1126 if (!power_well->count++) 1127 intel_power_well_enable(dev_priv, power_well); 1128 } 1129 1130 power_domains->domain_use_count[domain]++; 1131 1132 mutex_unlock(&power_domains->lock); 1133 } 1134 1135 /** 1136 * intel_display_power_put - release a power domain reference 1137 * @dev_priv: i915 device instance 1138 * @domain: power domain to reference 1139 * 1140 * This function drops the power domain reference obtained by 1141 * intel_display_power_get() and might power down the corresponding hardware 1142 * block right away if this is the last reference. 1143 */ 1144 void intel_display_power_put(struct drm_i915_private *dev_priv, 1145 enum intel_display_power_domain domain) 1146 { 1147 struct i915_power_domains *power_domains; 1148 struct i915_power_well *power_well; 1149 int i; 1150 1151 power_domains = &dev_priv->power_domains; 1152 1153 mutex_lock(&power_domains->lock); 1154 1155 WARN_ON(!power_domains->domain_use_count[domain]); 1156 power_domains->domain_use_count[domain]--; 1157 1158 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) { 1159 WARN_ON(!power_well->count); 1160 1161 if (!--power_well->count && i915.disable_power_well) 1162 intel_power_well_disable(dev_priv, power_well); 1163 } 1164 1165 mutex_unlock(&power_domains->lock); 1166 1167 intel_runtime_pm_put(dev_priv); 1168 } 1169 1170 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1) 1171 1172 #define HSW_ALWAYS_ON_POWER_DOMAINS ( \ 1173 BIT(POWER_DOMAIN_PIPE_A) | \ 1174 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 1175 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 1176 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 1177 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1178 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1179 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1180 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1181 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 1182 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 1183 BIT(POWER_DOMAIN_PORT_CRT) | \ 1184 BIT(POWER_DOMAIN_PLLS) | \ 1185 BIT(POWER_DOMAIN_AUX_A) | \ 1186 BIT(POWER_DOMAIN_AUX_B) | \ 1187 BIT(POWER_DOMAIN_AUX_C) | \ 1188 BIT(POWER_DOMAIN_AUX_D) | \ 1189 BIT(POWER_DOMAIN_INIT)) 1190 #define HSW_DISPLAY_POWER_DOMAINS ( \ 1191 (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) | \ 1192 BIT(POWER_DOMAIN_INIT)) 1193 1194 #define BDW_ALWAYS_ON_POWER_DOMAINS ( \ 1195 HSW_ALWAYS_ON_POWER_DOMAINS | \ 1196 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER)) 1197 #define BDW_DISPLAY_POWER_DOMAINS ( \ 1198 (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) | \ 1199 BIT(POWER_DOMAIN_INIT)) 1200 1201 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT) 1202 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK 1203 1204 #define VLV_DPIO_CMN_BC_POWER_DOMAINS ( \ 1205 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1206 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1207 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1208 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1209 BIT(POWER_DOMAIN_PORT_CRT) | \ 1210 BIT(POWER_DOMAIN_AUX_B) | \ 1211 BIT(POWER_DOMAIN_AUX_C) | \ 1212 BIT(POWER_DOMAIN_INIT)) 1213 1214 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS ( \ 1215 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1216 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1217 BIT(POWER_DOMAIN_AUX_B) | \ 1218 BIT(POWER_DOMAIN_INIT)) 1219 1220 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS ( \ 1221 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1222 BIT(POWER_DOMAIN_AUX_B) | \ 1223 BIT(POWER_DOMAIN_INIT)) 1224 1225 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS ( \ 1226 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1227 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1228 BIT(POWER_DOMAIN_AUX_C) | \ 1229 BIT(POWER_DOMAIN_INIT)) 1230 1231 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS ( \ 1232 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1233 BIT(POWER_DOMAIN_AUX_C) | \ 1234 BIT(POWER_DOMAIN_INIT)) 1235 1236 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \ 1237 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1238 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1239 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1240 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1241 BIT(POWER_DOMAIN_AUX_B) | \ 1242 BIT(POWER_DOMAIN_AUX_C) | \ 1243 BIT(POWER_DOMAIN_INIT)) 1244 1245 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \ 1246 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 1247 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 1248 BIT(POWER_DOMAIN_AUX_D) | \ 1249 BIT(POWER_DOMAIN_INIT)) 1250 1251 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = { 1252 .sync_hw = i9xx_always_on_power_well_noop, 1253 .enable = i9xx_always_on_power_well_noop, 1254 .disable = i9xx_always_on_power_well_noop, 1255 .is_enabled = i9xx_always_on_power_well_enabled, 1256 }; 1257 1258 static const struct i915_power_well_ops chv_pipe_power_well_ops = { 1259 .sync_hw = chv_pipe_power_well_sync_hw, 1260 .enable = chv_pipe_power_well_enable, 1261 .disable = chv_pipe_power_well_disable, 1262 .is_enabled = chv_pipe_power_well_enabled, 1263 }; 1264 1265 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = { 1266 .sync_hw = vlv_power_well_sync_hw, 1267 .enable = chv_dpio_cmn_power_well_enable, 1268 .disable = chv_dpio_cmn_power_well_disable, 1269 .is_enabled = vlv_power_well_enabled, 1270 }; 1271 1272 static struct i915_power_well i9xx_always_on_power_well[] = { 1273 { 1274 .name = "always-on", 1275 .always_on = 1, 1276 .domains = POWER_DOMAIN_MASK, 1277 .ops = &i9xx_always_on_power_well_ops, 1278 }, 1279 }; 1280 1281 static const struct i915_power_well_ops hsw_power_well_ops = { 1282 .sync_hw = hsw_power_well_sync_hw, 1283 .enable = hsw_power_well_enable, 1284 .disable = hsw_power_well_disable, 1285 .is_enabled = hsw_power_well_enabled, 1286 }; 1287 1288 static const struct i915_power_well_ops skl_power_well_ops = { 1289 .sync_hw = skl_power_well_sync_hw, 1290 .enable = skl_power_well_enable, 1291 .disable = skl_power_well_disable, 1292 .is_enabled = skl_power_well_enabled, 1293 }; 1294 1295 static struct i915_power_well hsw_power_wells[] = { 1296 { 1297 .name = "always-on", 1298 .always_on = 1, 1299 .domains = HSW_ALWAYS_ON_POWER_DOMAINS, 1300 .ops = &i9xx_always_on_power_well_ops, 1301 }, 1302 { 1303 .name = "display", 1304 .domains = HSW_DISPLAY_POWER_DOMAINS, 1305 .ops = &hsw_power_well_ops, 1306 }, 1307 }; 1308 1309 static struct i915_power_well bdw_power_wells[] = { 1310 { 1311 .name = "always-on", 1312 .always_on = 1, 1313 .domains = BDW_ALWAYS_ON_POWER_DOMAINS, 1314 .ops = &i9xx_always_on_power_well_ops, 1315 }, 1316 { 1317 .name = "display", 1318 .domains = BDW_DISPLAY_POWER_DOMAINS, 1319 .ops = &hsw_power_well_ops, 1320 }, 1321 }; 1322 1323 static const struct i915_power_well_ops vlv_display_power_well_ops = { 1324 .sync_hw = vlv_power_well_sync_hw, 1325 .enable = vlv_display_power_well_enable, 1326 .disable = vlv_display_power_well_disable, 1327 .is_enabled = vlv_power_well_enabled, 1328 }; 1329 1330 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = { 1331 .sync_hw = vlv_power_well_sync_hw, 1332 .enable = vlv_dpio_cmn_power_well_enable, 1333 .disable = vlv_dpio_cmn_power_well_disable, 1334 .is_enabled = vlv_power_well_enabled, 1335 }; 1336 1337 static const struct i915_power_well_ops vlv_dpio_power_well_ops = { 1338 .sync_hw = vlv_power_well_sync_hw, 1339 .enable = vlv_power_well_enable, 1340 .disable = vlv_power_well_disable, 1341 .is_enabled = vlv_power_well_enabled, 1342 }; 1343 1344 static struct i915_power_well vlv_power_wells[] = { 1345 { 1346 .name = "always-on", 1347 .always_on = 1, 1348 .domains = VLV_ALWAYS_ON_POWER_DOMAINS, 1349 .ops = &i9xx_always_on_power_well_ops, 1350 }, 1351 { 1352 .name = "display", 1353 .domains = VLV_DISPLAY_POWER_DOMAINS, 1354 .data = PUNIT_POWER_WELL_DISP2D, 1355 .ops = &vlv_display_power_well_ops, 1356 }, 1357 { 1358 .name = "dpio-tx-b-01", 1359 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1360 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1361 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1362 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1363 .ops = &vlv_dpio_power_well_ops, 1364 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01, 1365 }, 1366 { 1367 .name = "dpio-tx-b-23", 1368 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1369 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1370 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1371 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1372 .ops = &vlv_dpio_power_well_ops, 1373 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23, 1374 }, 1375 { 1376 .name = "dpio-tx-c-01", 1377 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1378 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1379 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1380 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1381 .ops = &vlv_dpio_power_well_ops, 1382 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01, 1383 }, 1384 { 1385 .name = "dpio-tx-c-23", 1386 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1387 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1388 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1389 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1390 .ops = &vlv_dpio_power_well_ops, 1391 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23, 1392 }, 1393 { 1394 .name = "dpio-common", 1395 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS, 1396 .data = PUNIT_POWER_WELL_DPIO_CMN_BC, 1397 .ops = &vlv_dpio_cmn_power_well_ops, 1398 }, 1399 }; 1400 1401 static struct i915_power_well chv_power_wells[] = { 1402 { 1403 .name = "always-on", 1404 .always_on = 1, 1405 .domains = VLV_ALWAYS_ON_POWER_DOMAINS, 1406 .ops = &i9xx_always_on_power_well_ops, 1407 }, 1408 { 1409 .name = "display", 1410 /* 1411 * Pipe A power well is the new disp2d well. Pipe B and C 1412 * power wells don't actually exist. Pipe A power well is 1413 * required for any pipe to work. 1414 */ 1415 .domains = VLV_DISPLAY_POWER_DOMAINS, 1416 .data = PIPE_A, 1417 .ops = &chv_pipe_power_well_ops, 1418 }, 1419 { 1420 .name = "dpio-common-bc", 1421 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS, 1422 .data = PUNIT_POWER_WELL_DPIO_CMN_BC, 1423 .ops = &chv_dpio_cmn_power_well_ops, 1424 }, 1425 { 1426 .name = "dpio-common-d", 1427 .domains = CHV_DPIO_CMN_D_POWER_DOMAINS, 1428 .data = PUNIT_POWER_WELL_DPIO_CMN_D, 1429 .ops = &chv_dpio_cmn_power_well_ops, 1430 }, 1431 }; 1432 1433 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv, 1434 int power_well_id) 1435 { 1436 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1437 struct i915_power_well *power_well; 1438 int i; 1439 1440 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) { 1441 if (power_well->data == power_well_id) 1442 return power_well; 1443 } 1444 1445 return NULL; 1446 } 1447 1448 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv, 1449 int power_well_id) 1450 { 1451 struct i915_power_well *power_well; 1452 bool ret; 1453 1454 power_well = lookup_power_well(dev_priv, power_well_id); 1455 ret = power_well->ops->is_enabled(dev_priv, power_well); 1456 1457 return ret; 1458 } 1459 1460 static struct i915_power_well skl_power_wells[] = { 1461 { 1462 .name = "always-on", 1463 .always_on = 1, 1464 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS, 1465 .ops = &i9xx_always_on_power_well_ops, 1466 }, 1467 { 1468 .name = "power well 1", 1469 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS, 1470 .ops = &skl_power_well_ops, 1471 .data = SKL_DISP_PW_1, 1472 }, 1473 { 1474 .name = "MISC IO power well", 1475 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS, 1476 .ops = &skl_power_well_ops, 1477 .data = SKL_DISP_PW_MISC_IO, 1478 }, 1479 { 1480 .name = "power well 2", 1481 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS, 1482 .ops = &skl_power_well_ops, 1483 .data = SKL_DISP_PW_2, 1484 }, 1485 { 1486 .name = "DDI A/E power well", 1487 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS, 1488 .ops = &skl_power_well_ops, 1489 .data = SKL_DISP_PW_DDI_A_E, 1490 }, 1491 { 1492 .name = "DDI B power well", 1493 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS, 1494 .ops = &skl_power_well_ops, 1495 .data = SKL_DISP_PW_DDI_B, 1496 }, 1497 { 1498 .name = "DDI C power well", 1499 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS, 1500 .ops = &skl_power_well_ops, 1501 .data = SKL_DISP_PW_DDI_C, 1502 }, 1503 { 1504 .name = "DDI D power well", 1505 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS, 1506 .ops = &skl_power_well_ops, 1507 .data = SKL_DISP_PW_DDI_D, 1508 }, 1509 }; 1510 1511 static struct i915_power_well bxt_power_wells[] = { 1512 { 1513 .name = "always-on", 1514 .always_on = 1, 1515 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS, 1516 .ops = &i9xx_always_on_power_well_ops, 1517 }, 1518 { 1519 .name = "power well 1", 1520 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS, 1521 .ops = &skl_power_well_ops, 1522 .data = SKL_DISP_PW_1, 1523 }, 1524 { 1525 .name = "power well 2", 1526 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS, 1527 .ops = &skl_power_well_ops, 1528 .data = SKL_DISP_PW_2, 1529 } 1530 }; 1531 1532 #define set_power_wells(power_domains, __power_wells) ({ \ 1533 (power_domains)->power_wells = (__power_wells); \ 1534 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \ 1535 }) 1536 1537 /** 1538 * intel_power_domains_init - initializes the power domain structures 1539 * @dev_priv: i915 device instance 1540 * 1541 * Initializes the power domain structures for @dev_priv depending upon the 1542 * supported platform. 1543 */ 1544 int intel_power_domains_init(struct drm_i915_private *dev_priv) 1545 { 1546 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1547 1548 mutex_init(&power_domains->lock); 1549 1550 /* 1551 * The enabling order will be from lower to higher indexed wells, 1552 * the disabling order is reversed. 1553 */ 1554 if (IS_HASWELL(dev_priv->dev)) { 1555 set_power_wells(power_domains, hsw_power_wells); 1556 } else if (IS_BROADWELL(dev_priv->dev)) { 1557 set_power_wells(power_domains, bdw_power_wells); 1558 } else if (IS_SKYLAKE(dev_priv->dev)) { 1559 set_power_wells(power_domains, skl_power_wells); 1560 } else if (IS_BROXTON(dev_priv->dev)) { 1561 set_power_wells(power_domains, bxt_power_wells); 1562 } else if (IS_CHERRYVIEW(dev_priv->dev)) { 1563 set_power_wells(power_domains, chv_power_wells); 1564 } else if (IS_VALLEYVIEW(dev_priv->dev)) { 1565 set_power_wells(power_domains, vlv_power_wells); 1566 } else { 1567 set_power_wells(power_domains, i9xx_always_on_power_well); 1568 } 1569 1570 return 0; 1571 } 1572 1573 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv) 1574 { 1575 struct drm_device *dev = dev_priv->dev; 1576 struct device *device = &dev->pdev->dev; 1577 1578 if (!HAS_RUNTIME_PM(dev)) 1579 return; 1580 1581 if (!intel_enable_rc6(dev)) 1582 return; 1583 1584 /* Make sure we're not suspended first. */ 1585 pm_runtime_get_sync(device); 1586 pm_runtime_disable(device); 1587 } 1588 1589 /** 1590 * intel_power_domains_fini - finalizes the power domain structures 1591 * @dev_priv: i915 device instance 1592 * 1593 * Finalizes the power domain structures for @dev_priv depending upon the 1594 * supported platform. This function also disables runtime pm and ensures that 1595 * the device stays powered up so that the driver can be reloaded. 1596 */ 1597 void intel_power_domains_fini(struct drm_i915_private *dev_priv) 1598 { 1599 intel_runtime_pm_disable(dev_priv); 1600 1601 /* The i915.ko module is still not prepared to be loaded when 1602 * the power well is not enabled, so just enable it in case 1603 * we're going to unload/reload. */ 1604 intel_display_set_init_power(dev_priv, true); 1605 } 1606 1607 static void intel_power_domains_resume(struct drm_i915_private *dev_priv) 1608 { 1609 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1610 struct i915_power_well *power_well; 1611 int i; 1612 1613 mutex_lock(&power_domains->lock); 1614 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) { 1615 power_well->ops->sync_hw(dev_priv, power_well); 1616 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv, 1617 power_well); 1618 } 1619 mutex_unlock(&power_domains->lock); 1620 } 1621 1622 static void chv_phy_control_init(struct drm_i915_private *dev_priv) 1623 { 1624 struct i915_power_well *cmn_bc = 1625 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC); 1626 struct i915_power_well *cmn_d = 1627 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D); 1628 1629 /* 1630 * DISPLAY_PHY_CONTROL can get corrupted if read. As a 1631 * workaround never ever read DISPLAY_PHY_CONTROL, and 1632 * instead maintain a shadow copy ourselves. Use the actual 1633 * power well state to reconstruct the expected initial 1634 * value. 1635 */ 1636 dev_priv->chv_phy_control = 1637 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY0) | 1638 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY1) | 1639 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH0) | 1640 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH1) | 1641 PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY1, DPIO_CH0); 1642 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) 1643 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0); 1644 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) 1645 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1); 1646 } 1647 1648 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv) 1649 { 1650 struct i915_power_well *cmn = 1651 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC); 1652 struct i915_power_well *disp2d = 1653 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D); 1654 1655 /* If the display might be already active skip this */ 1656 if (cmn->ops->is_enabled(dev_priv, cmn) && 1657 disp2d->ops->is_enabled(dev_priv, disp2d) && 1658 I915_READ(DPIO_CTL) & DPIO_CMNRST) 1659 return; 1660 1661 DRM_DEBUG_KMS("toggling display PHY side reset\n"); 1662 1663 /* cmnlane needs DPLL registers */ 1664 disp2d->ops->enable(dev_priv, disp2d); 1665 1666 /* 1667 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx: 1668 * Need to assert and de-assert PHY SB reset by gating the 1669 * common lane power, then un-gating it. 1670 * Simply ungating isn't enough to reset the PHY enough to get 1671 * ports and lanes running. 1672 */ 1673 cmn->ops->disable(dev_priv, cmn); 1674 } 1675 1676 /** 1677 * intel_power_domains_init_hw - initialize hardware power domain state 1678 * @dev_priv: i915 device instance 1679 * 1680 * This function initializes the hardware power domain state and enables all 1681 * power domains using intel_display_set_init_power(). 1682 */ 1683 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv) 1684 { 1685 struct drm_device *dev = dev_priv->dev; 1686 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1687 1688 power_domains->initializing = true; 1689 1690 if (IS_CHERRYVIEW(dev)) { 1691 chv_phy_control_init(dev_priv); 1692 } else if (IS_VALLEYVIEW(dev)) { 1693 mutex_lock(&power_domains->lock); 1694 vlv_cmnlane_wa(dev_priv); 1695 mutex_unlock(&power_domains->lock); 1696 } 1697 1698 /* For now, we need the power well to be always enabled. */ 1699 intel_display_set_init_power(dev_priv, true); 1700 intel_power_domains_resume(dev_priv); 1701 power_domains->initializing = false; 1702 } 1703 1704 /** 1705 * intel_aux_display_runtime_get - grab an auxiliary power domain reference 1706 * @dev_priv: i915 device instance 1707 * 1708 * This function grabs a power domain reference for the auxiliary power domain 1709 * (for access to the GMBUS and DP AUX blocks) and ensures that it and all its 1710 * parents are powered up. Therefore users should only grab a reference to the 1711 * innermost power domain they need. 1712 * 1713 * Any power domain reference obtained by this function must have a symmetric 1714 * call to intel_aux_display_runtime_put() to release the reference again. 1715 */ 1716 void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv) 1717 { 1718 intel_runtime_pm_get(dev_priv); 1719 } 1720 1721 /** 1722 * intel_aux_display_runtime_put - release an auxiliary power domain reference 1723 * @dev_priv: i915 device instance 1724 * 1725 * This function drops the auxiliary power domain reference obtained by 1726 * intel_aux_display_runtime_get() and might power down the corresponding 1727 * hardware block right away if this is the last reference. 1728 */ 1729 void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv) 1730 { 1731 intel_runtime_pm_put(dev_priv); 1732 } 1733 1734 /** 1735 * intel_runtime_pm_get - grab a runtime pm reference 1736 * @dev_priv: i915 device instance 1737 * 1738 * This function grabs a device-level runtime pm reference (mostly used for GEM 1739 * code to ensure the GTT or GT is on) and ensures that it is powered up. 1740 * 1741 * Any runtime pm reference obtained by this function must have a symmetric 1742 * call to intel_runtime_pm_put() to release the reference again. 1743 */ 1744 void intel_runtime_pm_get(struct drm_i915_private *dev_priv) 1745 { 1746 struct drm_device *dev = dev_priv->dev; 1747 struct device *device = &dev->pdev->dev; 1748 1749 if (!HAS_RUNTIME_PM(dev)) 1750 return; 1751 1752 pm_runtime_get_sync(device); 1753 WARN(dev_priv->pm.suspended, "Device still suspended.\n"); 1754 } 1755 1756 /** 1757 * intel_runtime_pm_get_noresume - grab a runtime pm reference 1758 * @dev_priv: i915 device instance 1759 * 1760 * This function grabs a device-level runtime pm reference (mostly used for GEM 1761 * code to ensure the GTT or GT is on). 1762 * 1763 * It will _not_ power up the device but instead only check that it's powered 1764 * on. Therefore it is only valid to call this functions from contexts where 1765 * the device is known to be powered up and where trying to power it up would 1766 * result in hilarity and deadlocks. That pretty much means only the system 1767 * suspend/resume code where this is used to grab runtime pm references for 1768 * delayed setup down in work items. 1769 * 1770 * Any runtime pm reference obtained by this function must have a symmetric 1771 * call to intel_runtime_pm_put() to release the reference again. 1772 */ 1773 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv) 1774 { 1775 struct drm_device *dev = dev_priv->dev; 1776 struct device *device = &dev->pdev->dev; 1777 1778 if (!HAS_RUNTIME_PM(dev)) 1779 return; 1780 1781 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n"); 1782 pm_runtime_get_noresume(device); 1783 } 1784 1785 /** 1786 * intel_runtime_pm_put - release a runtime pm reference 1787 * @dev_priv: i915 device instance 1788 * 1789 * This function drops the device-level runtime pm reference obtained by 1790 * intel_runtime_pm_get() and might power down the corresponding 1791 * hardware block right away if this is the last reference. 1792 */ 1793 void intel_runtime_pm_put(struct drm_i915_private *dev_priv) 1794 { 1795 struct drm_device *dev = dev_priv->dev; 1796 struct device *device = &dev->pdev->dev; 1797 1798 if (!HAS_RUNTIME_PM(dev)) 1799 return; 1800 1801 pm_runtime_mark_last_busy(device); 1802 pm_runtime_put_autosuspend(device); 1803 } 1804 1805 /** 1806 * intel_runtime_pm_enable - enable runtime pm 1807 * @dev_priv: i915 device instance 1808 * 1809 * This function enables runtime pm at the end of the driver load sequence. 1810 * 1811 * Note that this function does currently not enable runtime pm for the 1812 * subordinate display power domains. That is only done on the first modeset 1813 * using intel_display_set_init_power(). 1814 */ 1815 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv) 1816 { 1817 struct drm_device *dev = dev_priv->dev; 1818 struct device *device = &dev->pdev->dev; 1819 1820 if (!HAS_RUNTIME_PM(dev)) 1821 return; 1822 1823 pm_runtime_set_active(device); 1824 1825 /* 1826 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a 1827 * requirement. 1828 */ 1829 if (!intel_enable_rc6(dev)) { 1830 DRM_INFO("RC6 disabled, disabling runtime PM support\n"); 1831 return; 1832 } 1833 1834 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */ 1835 pm_runtime_mark_last_busy(device); 1836 pm_runtime_use_autosuspend(device); 1837 1838 pm_runtime_put_autosuspend(device); 1839 } 1840 1841