1 /* $NetBSD: intel_runtime_pm.c,v 1.9 2020/02/14 04:36:12 riastradh Exp $ */ 2 3 /* 4 * Copyright © 2012-2014 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 23 * IN THE SOFTWARE. 24 * 25 * Authors: 26 * Eugeni Dodonov <eugeni.dodonov@intel.com> 27 * Daniel Vetter <daniel.vetter@ffwll.ch> 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: intel_runtime_pm.c,v 1.9 2020/02/14 04:36:12 riastradh Exp $"); 33 34 #include <linux/pm_runtime.h> 35 #include <linux/vgaarb.h> 36 37 #include "i915_drv.h" 38 #include "intel_drv.h" 39 40 #include <linux/nbsd-namespace.h> 41 42 /** 43 * DOC: runtime pm 44 * 45 * The i915 driver supports dynamic enabling and disabling of entire hardware 46 * blocks at runtime. This is especially important on the display side where 47 * software is supposed to control many power gates manually on recent hardware, 48 * since on the GT side a lot of the power management is done by the hardware. 49 * But even there some manual control at the device level is required. 50 * 51 * Since i915 supports a diverse set of platforms with a unified codebase and 52 * hardware engineers just love to shuffle functionality around between power 53 * domains there's a sizeable amount of indirection required. This file provides 54 * generic functions to the driver for grabbing and releasing references for 55 * abstract power domains. It then maps those to the actual power wells 56 * present for a given platform. 57 */ 58 59 #define GEN9_ENABLE_DC5(dev) 0 60 #define SKL_ENABLE_DC6(dev) (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) 61 62 #define for_each_power_well(i, power_well, domain_mask, power_domains) \ 63 for (i = 0; \ 64 i < (power_domains)->power_well_count && \ 65 ((power_well) = &(power_domains)->power_wells[i]); \ 66 i++) \ 67 if ((power_well)->domains & (domain_mask)) 68 69 #define for_each_power_well_rev(i, power_well, domain_mask, power_domains) \ 70 for (i = (power_domains)->power_well_count - 1; \ 71 i >= 0 && ((power_well) = &(power_domains)->power_wells[i]);\ 72 i--) \ 73 if ((power_well)->domains & (domain_mask)) 74 75 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv, 76 int power_well_id); 77 78 static void intel_power_well_enable(struct drm_i915_private *dev_priv, 79 struct i915_power_well *power_well) 80 { 81 DRM_DEBUG_KMS("enabling %s\n", power_well->name); 82 power_well->ops->enable(dev_priv, power_well); 83 power_well->hw_enabled = true; 84 } 85 86 static void intel_power_well_disable(struct drm_i915_private *dev_priv, 87 struct i915_power_well *power_well) 88 { 89 DRM_DEBUG_KMS("disabling %s\n", power_well->name); 90 power_well->hw_enabled = false; 91 power_well->ops->disable(dev_priv, power_well); 92 } 93 94 /* 95 * We should only use the power well if we explicitly asked the hardware to 96 * enable it, so check if it's enabled and also check if we've requested it to 97 * be enabled. 98 */ 99 static bool hsw_power_well_enabled(struct drm_i915_private *dev_priv, 100 struct i915_power_well *power_well) 101 { 102 return I915_READ(HSW_PWR_WELL_DRIVER) == 103 (HSW_PWR_WELL_ENABLE_REQUEST | HSW_PWR_WELL_STATE_ENABLED); 104 } 105 106 /** 107 * __intel_display_power_is_enabled - unlocked check for a power domain 108 * @dev_priv: i915 device instance 109 * @domain: power domain to check 110 * 111 * This is the unlocked version of intel_display_power_is_enabled() and should 112 * only be used from error capture and recovery code where deadlocks are 113 * possible. 114 * 115 * Returns: 116 * True when the power domain is enabled, false otherwise. 117 */ 118 bool __intel_display_power_is_enabled(struct drm_i915_private *dev_priv, 119 enum intel_display_power_domain domain) 120 { 121 struct i915_power_domains *power_domains; 122 struct i915_power_well *power_well; 123 bool is_enabled; 124 int i; 125 126 if (dev_priv->pm.suspended) 127 return false; 128 129 power_domains = &dev_priv->power_domains; 130 131 is_enabled = true; 132 133 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) { 134 if (power_well->always_on) 135 continue; 136 137 if (!power_well->hw_enabled) { 138 is_enabled = false; 139 break; 140 } 141 } 142 143 return is_enabled; 144 } 145 146 /** 147 * intel_display_power_is_enabled - check for a power domain 148 * @dev_priv: i915 device instance 149 * @domain: power domain to check 150 * 151 * This function can be used to check the hw power domain state. It is mostly 152 * used in hardware state readout functions. Everywhere else code should rely 153 * upon explicit power domain reference counting to ensure that the hardware 154 * block is powered up before accessing it. 155 * 156 * Callers must hold the relevant modesetting locks to ensure that concurrent 157 * threads can't disable the power well while the caller tries to read a few 158 * registers. 159 * 160 * Returns: 161 * True when the power domain is enabled, false otherwise. 162 */ 163 bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv, 164 enum intel_display_power_domain domain) 165 { 166 struct i915_power_domains *power_domains; 167 bool ret; 168 169 power_domains = &dev_priv->power_domains; 170 171 mutex_lock(&power_domains->lock); 172 ret = __intel_display_power_is_enabled(dev_priv, domain); 173 mutex_unlock(&power_domains->lock); 174 175 return ret; 176 } 177 178 /** 179 * intel_display_set_init_power - set the initial power domain state 180 * @dev_priv: i915 device instance 181 * @enable: whether to enable or disable the initial power domain state 182 * 183 * For simplicity our driver load/unload and system suspend/resume code assumes 184 * that all power domains are always enabled. This functions controls the state 185 * of this little hack. While the initial power domain state is enabled runtime 186 * pm is effectively disabled. 187 */ 188 void intel_display_set_init_power(struct drm_i915_private *dev_priv, 189 bool enable) 190 { 191 if (dev_priv->power_domains.init_power_on == enable) 192 return; 193 194 if (enable) 195 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); 196 else 197 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT); 198 199 dev_priv->power_domains.init_power_on = enable; 200 } 201 202 static inline void 203 touch_vga_msr(struct drm_device *dev) 204 { 205 #ifdef __NetBSD__ 206 const bus_addr_t vgabase = 0x3c0; 207 const bus_space_tag_t iot = dev->pdev->pd_pa.pa_iot; 208 bus_space_handle_t ioh; 209 uint8_t msr; 210 int error; 211 212 error = bus_space_map(iot, vgabase, 0x10, 0, &ioh); 213 if (error) { 214 device_printf(dev->pdev->pd_dev, 215 "unable to map VGA registers: %d\n", error); 216 } else { 217 DRMCTASSERT(vgabase <= VGA_MSR_READ); 218 msr = bus_space_read_1(iot, ioh, VGA_MSR_READ - vgabase); 219 bus_space_write_1(iot, ioh, VGA_MSR_READ - vgabase, msr); 220 bus_space_unmap(iot, ioh, 0x10); 221 } 222 #else 223 vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); 224 outb(inb(VGA_MSR_READ), VGA_MSR_WRITE); 225 vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); 226 #endif 227 } 228 229 /* 230 * Starting with Haswell, we have a "Power Down Well" that can be turned off 231 * when not needed anymore. We have 4 registers that can request the power well 232 * to be enabled, and it will only be disabled if none of the registers is 233 * requesting it to be enabled. 234 */ 235 static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv) 236 { 237 struct drm_device *dev = dev_priv->dev; 238 239 /* 240 * After we re-enable the power well, if we touch VGA register 0x3d5 241 * we'll get unclaimed register interrupts. This stops after we write 242 * anything to the VGA MSR register. The vgacon module uses this 243 * register all the time, so if we unbind our driver and, as a 244 * consequence, bind vgacon, we'll get stuck in an infinite loop at 245 * console_unlock(). So make here we touch the VGA MSR register, making 246 * sure vgacon can keep working normally without triggering interrupts 247 * and error messages. 248 */ 249 touch_vga_msr(dev); 250 251 if (IS_BROADWELL(dev)) 252 gen8_irq_power_well_post_enable(dev_priv, 253 1 << PIPE_C | 1 << PIPE_B); 254 } 255 256 static void skl_power_well_post_enable(struct drm_i915_private *dev_priv, 257 struct i915_power_well *power_well) 258 { 259 struct drm_device *dev = dev_priv->dev; 260 261 /* 262 * After we re-enable the power well, if we touch VGA register 0x3d5 263 * we'll get unclaimed register interrupts. This stops after we write 264 * anything to the VGA MSR register. The vgacon module uses this 265 * register all the time, so if we unbind our driver and, as a 266 * consequence, bind vgacon, we'll get stuck in an infinite loop at 267 * console_unlock(). So make here we touch the VGA MSR register, making 268 * sure vgacon can keep working normally without triggering interrupts 269 * and error messages. 270 */ 271 if (power_well->data == SKL_DISP_PW_2) { 272 touch_vga_msr(dev); 273 274 gen8_irq_power_well_post_enable(dev_priv, 275 1 << PIPE_C | 1 << PIPE_B); 276 } 277 278 if (power_well->data == SKL_DISP_PW_1) { 279 if (!dev_priv->power_domains.initializing) 280 intel_prepare_ddi(dev); 281 gen8_irq_power_well_post_enable(dev_priv, 1 << PIPE_A); 282 } 283 } 284 285 static void hsw_set_power_well(struct drm_i915_private *dev_priv, 286 struct i915_power_well *power_well, bool enable) 287 { 288 bool is_enabled, enable_requested; 289 uint32_t tmp; 290 291 tmp = I915_READ(HSW_PWR_WELL_DRIVER); 292 is_enabled = tmp & HSW_PWR_WELL_STATE_ENABLED; 293 enable_requested = tmp & HSW_PWR_WELL_ENABLE_REQUEST; 294 295 if (enable) { 296 if (!enable_requested) 297 I915_WRITE(HSW_PWR_WELL_DRIVER, 298 HSW_PWR_WELL_ENABLE_REQUEST); 299 300 if (!is_enabled) { 301 DRM_DEBUG_KMS("Enabling power well\n"); 302 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) & 303 HSW_PWR_WELL_STATE_ENABLED), 20)) 304 DRM_ERROR("Timeout enabling power well\n"); 305 hsw_power_well_post_enable(dev_priv); 306 } 307 308 } else { 309 if (enable_requested) { 310 I915_WRITE(HSW_PWR_WELL_DRIVER, 0); 311 POSTING_READ(HSW_PWR_WELL_DRIVER); 312 DRM_DEBUG_KMS("Requesting to disable the power well\n"); 313 } 314 } 315 } 316 317 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \ 318 BIT(POWER_DOMAIN_TRANSCODER_A) | \ 319 BIT(POWER_DOMAIN_PIPE_B) | \ 320 BIT(POWER_DOMAIN_TRANSCODER_B) | \ 321 BIT(POWER_DOMAIN_PIPE_C) | \ 322 BIT(POWER_DOMAIN_TRANSCODER_C) | \ 323 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \ 324 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \ 325 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 326 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 327 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 328 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 329 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 330 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 331 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \ 332 BIT(POWER_DOMAIN_AUX_B) | \ 333 BIT(POWER_DOMAIN_AUX_C) | \ 334 BIT(POWER_DOMAIN_AUX_D) | \ 335 BIT(POWER_DOMAIN_AUDIO) | \ 336 BIT(POWER_DOMAIN_VGA) | \ 337 BIT(POWER_DOMAIN_INIT)) 338 #define SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \ 339 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 340 BIT(POWER_DOMAIN_PLLS) | \ 341 BIT(POWER_DOMAIN_PIPE_A) | \ 342 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 343 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \ 344 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 345 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 346 BIT(POWER_DOMAIN_AUX_A) | \ 347 BIT(POWER_DOMAIN_INIT)) 348 #define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \ 349 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 350 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 351 BIT(POWER_DOMAIN_PORT_DDI_E_2_LANES) | \ 352 BIT(POWER_DOMAIN_INIT)) 353 #define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \ 354 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 355 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 356 BIT(POWER_DOMAIN_INIT)) 357 #define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \ 358 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 359 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 360 BIT(POWER_DOMAIN_INIT)) 361 #define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \ 362 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 363 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 364 BIT(POWER_DOMAIN_INIT)) 365 #define SKL_DISPLAY_MISC_IO_POWER_DOMAINS ( \ 366 SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 367 BIT(POWER_DOMAIN_PLLS) | \ 368 BIT(POWER_DOMAIN_INIT)) 369 #define SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \ 370 (POWER_DOMAIN_MASK & ~(SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 371 SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 372 SKL_DISPLAY_DDI_A_E_POWER_DOMAINS | \ 373 SKL_DISPLAY_DDI_B_POWER_DOMAINS | \ 374 SKL_DISPLAY_DDI_C_POWER_DOMAINS | \ 375 SKL_DISPLAY_DDI_D_POWER_DOMAINS | \ 376 SKL_DISPLAY_MISC_IO_POWER_DOMAINS)) | \ 377 BIT(POWER_DOMAIN_INIT)) 378 379 #define BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS ( \ 380 BIT(POWER_DOMAIN_TRANSCODER_A) | \ 381 BIT(POWER_DOMAIN_PIPE_B) | \ 382 BIT(POWER_DOMAIN_TRANSCODER_B) | \ 383 BIT(POWER_DOMAIN_PIPE_C) | \ 384 BIT(POWER_DOMAIN_TRANSCODER_C) | \ 385 BIT(POWER_DOMAIN_PIPE_B_PANEL_FITTER) | \ 386 BIT(POWER_DOMAIN_PIPE_C_PANEL_FITTER) | \ 387 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 388 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 389 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 390 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 391 BIT(POWER_DOMAIN_AUX_B) | \ 392 BIT(POWER_DOMAIN_AUX_C) | \ 393 BIT(POWER_DOMAIN_AUDIO) | \ 394 BIT(POWER_DOMAIN_VGA) | \ 395 BIT(POWER_DOMAIN_GMBUS) | \ 396 BIT(POWER_DOMAIN_INIT)) 397 #define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS ( \ 398 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS | \ 399 BIT(POWER_DOMAIN_PIPE_A) | \ 400 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 401 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) | \ 402 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 403 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 404 BIT(POWER_DOMAIN_AUX_A) | \ 405 BIT(POWER_DOMAIN_PLLS) | \ 406 BIT(POWER_DOMAIN_INIT)) 407 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS ( \ 408 (POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS | \ 409 BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \ 410 BIT(POWER_DOMAIN_INIT)) 411 412 static void assert_can_enable_dc9(struct drm_i915_private *dev_priv) 413 { 414 struct drm_device *dev = dev_priv->dev; 415 416 WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n"); 417 WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), 418 "DC9 already programmed to be enabled.\n"); 419 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, 420 "DC5 still not disabled to enable DC9.\n"); 421 WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n"); 422 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); 423 424 /* 425 * TODO: check for the following to verify the conditions to enter DC9 426 * state are satisfied: 427 * 1] Check relevant display engine registers to verify if mode set 428 * disable sequence was followed. 429 * 2] Check if display uninitialize sequence is initialized. 430 */ 431 } 432 433 static void assert_can_disable_dc9(struct drm_i915_private *dev_priv) 434 { 435 WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); 436 WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), 437 "DC9 already programmed to be disabled.\n"); 438 WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, 439 "DC5 still not disabled.\n"); 440 441 /* 442 * TODO: check for the following to verify DC9 state was indeed 443 * entered before programming to disable it: 444 * 1] Check relevant display engine registers to verify if mode 445 * set disable sequence was followed. 446 * 2] Check if display uninitialize sequence is initialized. 447 */ 448 } 449 450 void bxt_enable_dc9(struct drm_i915_private *dev_priv) 451 { 452 uint32_t val; 453 454 assert_can_enable_dc9(dev_priv); 455 456 DRM_DEBUG_KMS("Enabling DC9\n"); 457 458 val = I915_READ(DC_STATE_EN); 459 val |= DC_STATE_EN_DC9; 460 I915_WRITE(DC_STATE_EN, val); 461 POSTING_READ(DC_STATE_EN); 462 } 463 464 void bxt_disable_dc9(struct drm_i915_private *dev_priv) 465 { 466 uint32_t val; 467 468 assert_can_disable_dc9(dev_priv); 469 470 DRM_DEBUG_KMS("Disabling DC9\n"); 471 472 val = I915_READ(DC_STATE_EN); 473 val &= ~DC_STATE_EN_DC9; 474 I915_WRITE(DC_STATE_EN, val); 475 POSTING_READ(DC_STATE_EN); 476 } 477 478 static void gen9_set_dc_state_debugmask_memory_up( 479 struct drm_i915_private *dev_priv) 480 { 481 uint32_t val; 482 483 /* The below bit doesn't need to be cleared ever afterwards */ 484 val = I915_READ(DC_STATE_DEBUG); 485 if (!(val & DC_STATE_DEBUG_MASK_MEMORY_UP)) { 486 val |= DC_STATE_DEBUG_MASK_MEMORY_UP; 487 I915_WRITE(DC_STATE_DEBUG, val); 488 POSTING_READ(DC_STATE_DEBUG); 489 } 490 } 491 492 static void assert_can_enable_dc5(struct drm_i915_private *dev_priv) 493 { 494 struct drm_device *dev = dev_priv->dev; 495 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv, 496 SKL_DISP_PW_2); 497 498 WARN_ONCE(!IS_SKYLAKE(dev) && !IS_KABYLAKE(dev), 499 "Platform doesn't support DC5.\n"); 500 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n"); 501 WARN_ONCE(pg2_enabled, "PG2 not disabled to enable DC5.\n"); 502 503 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5), 504 "DC5 already programmed to be enabled.\n"); 505 WARN_ONCE(dev_priv->pm.suspended, 506 "DC5 cannot be enabled, if platform is runtime-suspended.\n"); 507 508 assert_csr_loaded(dev_priv); 509 } 510 511 static void assert_can_disable_dc5(struct drm_i915_private *dev_priv) 512 { 513 bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv, 514 SKL_DISP_PW_2); 515 /* 516 * During initialization, the firmware may not be loaded yet. 517 * We still want to make sure that the DC enabling flag is cleared. 518 */ 519 if (dev_priv->power_domains.initializing) 520 return; 521 522 WARN_ONCE(!pg2_enabled, "PG2 not enabled to disable DC5.\n"); 523 WARN_ONCE(dev_priv->pm.suspended, 524 "Disabling of DC5 while platform is runtime-suspended should never happen.\n"); 525 } 526 527 static void gen9_enable_dc5(struct drm_i915_private *dev_priv) 528 { 529 uint32_t val; 530 531 assert_can_enable_dc5(dev_priv); 532 533 DRM_DEBUG_KMS("Enabling DC5\n"); 534 535 gen9_set_dc_state_debugmask_memory_up(dev_priv); 536 537 val = I915_READ(DC_STATE_EN); 538 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK; 539 val |= DC_STATE_EN_UPTO_DC5; 540 I915_WRITE(DC_STATE_EN, val); 541 POSTING_READ(DC_STATE_EN); 542 } 543 544 static void gen9_disable_dc5(struct drm_i915_private *dev_priv) 545 { 546 uint32_t val; 547 548 assert_can_disable_dc5(dev_priv); 549 550 DRM_DEBUG_KMS("Disabling DC5\n"); 551 552 val = I915_READ(DC_STATE_EN); 553 val &= ~DC_STATE_EN_UPTO_DC5; 554 I915_WRITE(DC_STATE_EN, val); 555 POSTING_READ(DC_STATE_EN); 556 } 557 558 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv) 559 { 560 struct drm_device *dev = dev_priv->dev; 561 562 WARN_ONCE(!IS_SKYLAKE(dev) && !IS_KABYLAKE(dev), 563 "Platform doesn't support DC6.\n"); 564 WARN_ONCE(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n"); 565 WARN_ONCE(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE, 566 "Backlight is not disabled.\n"); 567 WARN_ONCE((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6), 568 "DC6 already programmed to be enabled.\n"); 569 570 assert_csr_loaded(dev_priv); 571 } 572 573 static void assert_can_disable_dc6(struct drm_i915_private *dev_priv) 574 { 575 /* 576 * During initialization, the firmware may not be loaded yet. 577 * We still want to make sure that the DC enabling flag is cleared. 578 */ 579 if (dev_priv->power_domains.initializing) 580 return; 581 582 assert_csr_loaded(dev_priv); 583 WARN_ONCE(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC6), 584 "DC6 already programmed to be disabled.\n"); 585 } 586 587 static void skl_enable_dc6(struct drm_i915_private *dev_priv) 588 { 589 uint32_t val; 590 591 assert_can_enable_dc6(dev_priv); 592 593 DRM_DEBUG_KMS("Enabling DC6\n"); 594 595 gen9_set_dc_state_debugmask_memory_up(dev_priv); 596 597 val = I915_READ(DC_STATE_EN); 598 val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK; 599 val |= DC_STATE_EN_UPTO_DC6; 600 I915_WRITE(DC_STATE_EN, val); 601 POSTING_READ(DC_STATE_EN); 602 } 603 604 static void skl_disable_dc6(struct drm_i915_private *dev_priv) 605 { 606 uint32_t val; 607 608 assert_can_disable_dc6(dev_priv); 609 610 DRM_DEBUG_KMS("Disabling DC6\n"); 611 612 val = I915_READ(DC_STATE_EN); 613 val &= ~DC_STATE_EN_UPTO_DC6; 614 I915_WRITE(DC_STATE_EN, val); 615 POSTING_READ(DC_STATE_EN); 616 } 617 618 static void skl_set_power_well(struct drm_i915_private *dev_priv, 619 struct i915_power_well *power_well, bool enable) 620 { 621 struct drm_device *dev = dev_priv->dev; 622 uint32_t tmp, fuse_status; 623 uint32_t req_mask, state_mask; 624 bool is_enabled, enable_requested, check_fuse_status = false; 625 626 tmp = I915_READ(HSW_PWR_WELL_DRIVER); 627 fuse_status = I915_READ(SKL_FUSE_STATUS); 628 629 switch (power_well->data) { 630 case SKL_DISP_PW_1: 631 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 632 SKL_FUSE_PG0_DIST_STATUS), 1)) { 633 DRM_ERROR("PG0 not enabled\n"); 634 return; 635 } 636 break; 637 case SKL_DISP_PW_2: 638 if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) { 639 DRM_ERROR("PG1 in disabled state\n"); 640 return; 641 } 642 break; 643 case SKL_DISP_PW_DDI_A_E: 644 case SKL_DISP_PW_DDI_B: 645 case SKL_DISP_PW_DDI_C: 646 case SKL_DISP_PW_DDI_D: 647 case SKL_DISP_PW_MISC_IO: 648 break; 649 default: 650 WARN(1, "Unknown power well %lu\n", power_well->data); 651 return; 652 } 653 654 req_mask = SKL_POWER_WELL_REQ(power_well->data); 655 enable_requested = tmp & req_mask; 656 state_mask = SKL_POWER_WELL_STATE(power_well->data); 657 is_enabled = tmp & state_mask; 658 659 if (enable) { 660 if (!enable_requested) { 661 WARN((tmp & state_mask) && 662 !I915_READ(HSW_PWR_WELL_BIOS), 663 "Invalid for power well status to be enabled, unless done by the BIOS, \ 664 when request is to disable!\n"); 665 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) && 666 power_well->data == SKL_DISP_PW_2) { 667 if (SKL_ENABLE_DC6(dev)) { 668 skl_disable_dc6(dev_priv); 669 /* 670 * DDI buffer programming unnecessary during driver-load/resume 671 * as it's already done during modeset initialization then. 672 * It's also invalid here as encoder list is still uninitialized. 673 */ 674 if (!dev_priv->power_domains.initializing) 675 intel_prepare_ddi(dev); 676 } else { 677 gen9_disable_dc5(dev_priv); 678 } 679 } 680 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask); 681 } 682 683 if (!is_enabled) { 684 DRM_DEBUG_KMS("Enabling %s\n", power_well->name); 685 if (wait_for((I915_READ(HSW_PWR_WELL_DRIVER) & 686 state_mask), 1)) 687 DRM_ERROR("%s enable timeout\n", 688 power_well->name); 689 check_fuse_status = true; 690 } 691 } else { 692 if (enable_requested) { 693 if ((IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) && 694 (power_well->data == SKL_DISP_PW_1) && 695 (intel_csr_load_status_get(dev_priv) == FW_LOADED)) 696 DRM_DEBUG_KMS("Not Disabling PW1, dmc will handle\n"); 697 else { 698 I915_WRITE(HSW_PWR_WELL_DRIVER, tmp & ~req_mask); 699 POSTING_READ(HSW_PWR_WELL_DRIVER); 700 DRM_DEBUG_KMS("Disabling %s\n", power_well->name); 701 } 702 703 if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) && 704 power_well->data == SKL_DISP_PW_2) { 705 enum csr_state state; 706 /* TODO: wait for a completion event or 707 * similar here instead of busy 708 * waiting using wait_for function. 709 */ 710 wait_for((state = intel_csr_load_status_get(dev_priv)) != 711 FW_UNINITIALIZED, 1000); 712 if (state != FW_LOADED) 713 DRM_DEBUG("CSR firmware not ready (%d)\n", 714 state); 715 else 716 if (SKL_ENABLE_DC6(dev)) 717 skl_enable_dc6(dev_priv); 718 else 719 gen9_enable_dc5(dev_priv); 720 } 721 } 722 } 723 724 if (check_fuse_status) { 725 if (power_well->data == SKL_DISP_PW_1) { 726 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 727 SKL_FUSE_PG1_DIST_STATUS), 1)) 728 DRM_ERROR("PG1 distributing status timeout\n"); 729 } else if (power_well->data == SKL_DISP_PW_2) { 730 if (wait_for((I915_READ(SKL_FUSE_STATUS) & 731 SKL_FUSE_PG2_DIST_STATUS), 1)) 732 DRM_ERROR("PG2 distributing status timeout\n"); 733 } 734 } 735 736 if (enable && !is_enabled) 737 skl_power_well_post_enable(dev_priv, power_well); 738 } 739 740 static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv, 741 struct i915_power_well *power_well) 742 { 743 hsw_set_power_well(dev_priv, power_well, power_well->count > 0); 744 745 /* 746 * We're taking over the BIOS, so clear any requests made by it since 747 * the driver is in charge now. 748 */ 749 if (I915_READ(HSW_PWR_WELL_BIOS) & HSW_PWR_WELL_ENABLE_REQUEST) 750 I915_WRITE(HSW_PWR_WELL_BIOS, 0); 751 } 752 753 static void hsw_power_well_enable(struct drm_i915_private *dev_priv, 754 struct i915_power_well *power_well) 755 { 756 hsw_set_power_well(dev_priv, power_well, true); 757 } 758 759 static void hsw_power_well_disable(struct drm_i915_private *dev_priv, 760 struct i915_power_well *power_well) 761 { 762 hsw_set_power_well(dev_priv, power_well, false); 763 } 764 765 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv, 766 struct i915_power_well *power_well) 767 { 768 uint32_t mask = SKL_POWER_WELL_REQ(power_well->data) | 769 SKL_POWER_WELL_STATE(power_well->data); 770 771 return (I915_READ(HSW_PWR_WELL_DRIVER) & mask) == mask; 772 } 773 774 static void skl_power_well_sync_hw(struct drm_i915_private *dev_priv, 775 struct i915_power_well *power_well) 776 { 777 skl_set_power_well(dev_priv, power_well, power_well->count > 0); 778 779 /* Clear any request made by BIOS as driver is taking over */ 780 I915_WRITE(HSW_PWR_WELL_BIOS, 0); 781 } 782 783 static void skl_power_well_enable(struct drm_i915_private *dev_priv, 784 struct i915_power_well *power_well) 785 { 786 skl_set_power_well(dev_priv, power_well, true); 787 } 788 789 static void skl_power_well_disable(struct drm_i915_private *dev_priv, 790 struct i915_power_well *power_well) 791 { 792 skl_set_power_well(dev_priv, power_well, false); 793 } 794 795 static void i9xx_always_on_power_well_noop(struct drm_i915_private *dev_priv, 796 struct i915_power_well *power_well) 797 { 798 } 799 800 static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv, 801 struct i915_power_well *power_well) 802 { 803 return true; 804 } 805 806 static void vlv_set_power_well(struct drm_i915_private *dev_priv, 807 struct i915_power_well *power_well, bool enable) 808 { 809 enum punit_power_well power_well_id = power_well->data; 810 u32 mask; 811 u32 state; 812 u32 ctrl; 813 814 mask = PUNIT_PWRGT_MASK(power_well_id); 815 state = enable ? PUNIT_PWRGT_PWR_ON(power_well_id) : 816 PUNIT_PWRGT_PWR_GATE(power_well_id); 817 818 mutex_lock(&dev_priv->rps.hw_lock); 819 820 #define COND \ 821 ((vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask) == state) 822 823 if (COND) 824 goto out; 825 826 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL); 827 ctrl &= ~mask; 828 ctrl |= state; 829 vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, ctrl); 830 831 if (wait_for(COND, 100)) 832 DRM_ERROR("timeout setting power well state %08x (%08x)\n", 833 state, 834 vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL)); 835 836 #undef COND 837 838 out: 839 mutex_unlock(&dev_priv->rps.hw_lock); 840 } 841 842 static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv, 843 struct i915_power_well *power_well) 844 { 845 vlv_set_power_well(dev_priv, power_well, power_well->count > 0); 846 } 847 848 static void vlv_power_well_enable(struct drm_i915_private *dev_priv, 849 struct i915_power_well *power_well) 850 { 851 vlv_set_power_well(dev_priv, power_well, true); 852 } 853 854 static void vlv_power_well_disable(struct drm_i915_private *dev_priv, 855 struct i915_power_well *power_well) 856 { 857 vlv_set_power_well(dev_priv, power_well, false); 858 } 859 860 static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv, 861 struct i915_power_well *power_well) 862 { 863 int power_well_id = power_well->data; 864 bool enabled = false; 865 u32 mask; 866 u32 state; 867 u32 ctrl; 868 869 mask = PUNIT_PWRGT_MASK(power_well_id); 870 ctrl = PUNIT_PWRGT_PWR_ON(power_well_id); 871 872 mutex_lock(&dev_priv->rps.hw_lock); 873 874 state = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS) & mask; 875 /* 876 * We only ever set the power-on and power-gate states, anything 877 * else is unexpected. 878 */ 879 WARN_ON(state != PUNIT_PWRGT_PWR_ON(power_well_id) && 880 state != PUNIT_PWRGT_PWR_GATE(power_well_id)); 881 if (state == ctrl) 882 enabled = true; 883 884 /* 885 * A transient state at this point would mean some unexpected party 886 * is poking at the power controls too. 887 */ 888 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL) & mask; 889 WARN_ON(ctrl != state); 890 891 mutex_unlock(&dev_priv->rps.hw_lock); 892 893 return enabled; 894 } 895 896 static void vlv_display_power_well_init(struct drm_i915_private *dev_priv) 897 { 898 enum pipe pipe; 899 900 /* 901 * Enable the CRI clock source so we can get at the 902 * display and the reference clock for VGA 903 * hotplug / manual detection. Supposedly DSI also 904 * needs the ref clock up and running. 905 * 906 * CHV DPLL B/C have some issues if VGA mode is enabled. 907 */ 908 for_each_pipe(dev_priv->dev, pipe) { 909 u32 val = I915_READ(DPLL(pipe)); 910 911 val |= DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS; 912 if (pipe != PIPE_A) 913 val |= DPLL_INTEGRATED_CRI_CLK_VLV; 914 915 I915_WRITE(DPLL(pipe), val); 916 } 917 918 spin_lock_irq(&dev_priv->irq_lock); 919 valleyview_enable_display_irqs(dev_priv); 920 spin_unlock_irq(&dev_priv->irq_lock); 921 922 /* 923 * During driver initialization/resume we can avoid restoring the 924 * part of the HW/SW state that will be inited anyway explicitly. 925 */ 926 if (dev_priv->power_domains.initializing) 927 return; 928 929 intel_hpd_init(dev_priv); 930 931 i915_redisable_vga_power_on(dev_priv->dev); 932 } 933 934 static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv) 935 { 936 spin_lock_irq(&dev_priv->irq_lock); 937 valleyview_disable_display_irqs(dev_priv); 938 spin_unlock_irq(&dev_priv->irq_lock); 939 940 vlv_power_sequencer_reset(dev_priv); 941 } 942 943 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv, 944 struct i915_power_well *power_well) 945 { 946 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D); 947 948 vlv_set_power_well(dev_priv, power_well, true); 949 950 vlv_display_power_well_init(dev_priv); 951 } 952 953 static void vlv_display_power_well_disable(struct drm_i915_private *dev_priv, 954 struct i915_power_well *power_well) 955 { 956 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DISP2D); 957 958 vlv_display_power_well_deinit(dev_priv); 959 960 vlv_set_power_well(dev_priv, power_well, false); 961 } 962 963 static void vlv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv, 964 struct i915_power_well *power_well) 965 { 966 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC); 967 968 /* since ref/cri clock was enabled */ 969 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */ 970 971 vlv_set_power_well(dev_priv, power_well, true); 972 973 /* 974 * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx - 975 * 6. De-assert cmn_reset/side_reset. Same as VLV X0. 976 * a. GUnit 0x2110 bit[0] set to 1 (def 0) 977 * b. The other bits such as sfr settings / modesel may all 978 * be set to 0. 979 * 980 * This should only be done on init and resume from S3 with 981 * both PLLs disabled, or we risk losing DPIO and PLL 982 * synchronization. 983 */ 984 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) | DPIO_CMNRST); 985 } 986 987 static void vlv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv, 988 struct i915_power_well *power_well) 989 { 990 enum pipe pipe; 991 992 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC); 993 994 for_each_pipe(dev_priv, pipe) 995 assert_pll_disabled(dev_priv, pipe); 996 997 /* Assert common reset */ 998 I915_WRITE(DPIO_CTL, I915_READ(DPIO_CTL) & ~DPIO_CMNRST); 999 1000 vlv_set_power_well(dev_priv, power_well, false); 1001 } 1002 1003 #define POWER_DOMAIN_MASK (BIT(POWER_DOMAIN_NUM) - 1) 1004 1005 static struct i915_power_well *lookup_power_well(struct drm_i915_private *dev_priv, 1006 int power_well_id) 1007 { 1008 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1009 struct i915_power_well *power_well; 1010 int i; 1011 1012 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) { 1013 if (power_well->data == power_well_id) 1014 return power_well; 1015 } 1016 1017 return NULL; 1018 } 1019 1020 #define BITS_SET(val, bits) (((val) & (bits)) == (bits)) 1021 1022 static void assert_chv_phy_status(struct drm_i915_private *dev_priv) 1023 { 1024 struct i915_power_well *cmn_bc = 1025 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC); 1026 struct i915_power_well *cmn_d = 1027 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D); 1028 u32 phy_control = dev_priv->chv_phy_control; 1029 u32 phy_status = 0; 1030 u32 phy_status_mask = 0xffffffff; 1031 u32 tmp; 1032 1033 /* 1034 * The BIOS can leave the PHY is some weird state 1035 * where it doesn't fully power down some parts. 1036 * Disable the asserts until the PHY has been fully 1037 * reset (ie. the power well has been disabled at 1038 * least once). 1039 */ 1040 if (!dev_priv->chv_phy_assert[DPIO_PHY0]) 1041 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0) | 1042 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0) | 1043 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1) | 1044 PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1) | 1045 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0) | 1046 PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1)); 1047 1048 if (!dev_priv->chv_phy_assert[DPIO_PHY1]) 1049 phy_status_mask &= ~(PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0) | 1050 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0) | 1051 PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1)); 1052 1053 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) { 1054 phy_status |= PHY_POWERGOOD(DPIO_PHY0); 1055 1056 /* this assumes override is only used to enable lanes */ 1057 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0)) == 0) 1058 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0); 1059 1060 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1)) == 0) 1061 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1); 1062 1063 /* CL1 is on whenever anything is on in either channel */ 1064 if (BITS_SET(phy_control, 1065 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH0) | 1066 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1))) 1067 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH0); 1068 1069 /* 1070 * The DPLLB check accounts for the pipe B + port A usage 1071 * with CL2 powered up but all the lanes in the second channel 1072 * powered down. 1073 */ 1074 if (BITS_SET(phy_control, 1075 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY0, DPIO_CH1)) && 1076 (I915_READ(DPLL(PIPE_B)) & DPLL_VCO_ENABLE) == 0) 1077 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY0, DPIO_CH1); 1078 1079 if (BITS_SET(phy_control, 1080 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH0))) 1081 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 0); 1082 if (BITS_SET(phy_control, 1083 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH0))) 1084 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH0, 1); 1085 1086 if (BITS_SET(phy_control, 1087 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY0, DPIO_CH1))) 1088 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 0); 1089 if (BITS_SET(phy_control, 1090 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY0, DPIO_CH1))) 1091 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY0, DPIO_CH1, 1); 1092 } 1093 1094 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) { 1095 phy_status |= PHY_POWERGOOD(DPIO_PHY1); 1096 1097 /* this assumes override is only used to enable lanes */ 1098 if ((phy_control & PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0)) == 0) 1099 phy_control |= PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0); 1100 1101 if (BITS_SET(phy_control, 1102 PHY_CH_POWER_DOWN_OVRD(0xf, DPIO_PHY1, DPIO_CH0))) 1103 phy_status |= PHY_STATUS_CMN_LDO(DPIO_PHY1, DPIO_CH0); 1104 1105 if (BITS_SET(phy_control, 1106 PHY_CH_POWER_DOWN_OVRD(0x3, DPIO_PHY1, DPIO_CH0))) 1107 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 0); 1108 if (BITS_SET(phy_control, 1109 PHY_CH_POWER_DOWN_OVRD(0xc, DPIO_PHY1, DPIO_CH0))) 1110 phy_status |= PHY_STATUS_SPLINE_LDO(DPIO_PHY1, DPIO_CH0, 1); 1111 } 1112 1113 phy_status &= phy_status_mask; 1114 1115 /* 1116 * The PHY may be busy with some initial calibration and whatnot, 1117 * so the power state can take a while to actually change. 1118 */ 1119 if (wait_for((tmp = I915_READ(DISPLAY_PHY_STATUS) & phy_status_mask) == phy_status, 10)) 1120 WARN(phy_status != tmp, 1121 "Unexpected PHY_STATUS 0x%08x, expected 0x%08x (PHY_CONTROL=0x%08x)\n", 1122 tmp, phy_status, dev_priv->chv_phy_control); 1123 } 1124 1125 #undef BITS_SET 1126 1127 static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv, 1128 struct i915_power_well *power_well) 1129 { 1130 enum dpio_phy phy; 1131 enum pipe pipe; 1132 uint32_t tmp; 1133 1134 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC && 1135 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D); 1136 1137 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) { 1138 pipe = PIPE_A; 1139 phy = DPIO_PHY0; 1140 } else { 1141 pipe = PIPE_C; 1142 phy = DPIO_PHY1; 1143 } 1144 1145 /* since ref/cri clock was enabled */ 1146 udelay(1); /* >10ns for cmnreset, >0ns for sidereset */ 1147 vlv_set_power_well(dev_priv, power_well, true); 1148 1149 /* Poll for phypwrgood signal */ 1150 if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1)) 1151 DRM_ERROR("Display PHY %d is not power up\n", phy); 1152 1153 mutex_lock(&dev_priv->sb_lock); 1154 1155 /* Enable dynamic power down */ 1156 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW28); 1157 tmp |= DPIO_DYNPWRDOWNEN_CH0 | DPIO_CL1POWERDOWNEN | 1158 DPIO_SUS_CLK_CONFIG_GATE_CLKREQ; 1159 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW28, tmp); 1160 1161 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) { 1162 tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1); 1163 tmp |= DPIO_DYNPWRDOWNEN_CH1; 1164 vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp); 1165 } else { 1166 /* 1167 * Force the non-existing CL2 off. BXT does this 1168 * too, so maybe it saves some power even though 1169 * CL2 doesn't exist? 1170 */ 1171 tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30); 1172 tmp |= DPIO_CL2_LDOFUSE_PWRENB; 1173 vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp); 1174 } 1175 1176 mutex_unlock(&dev_priv->sb_lock); 1177 1178 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy); 1179 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 1180 1181 DRM_DEBUG_KMS("Enabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n", 1182 phy, dev_priv->chv_phy_control); 1183 1184 assert_chv_phy_status(dev_priv); 1185 } 1186 1187 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv, 1188 struct i915_power_well *power_well) 1189 { 1190 enum dpio_phy phy; 1191 1192 WARN_ON_ONCE(power_well->data != PUNIT_POWER_WELL_DPIO_CMN_BC && 1193 power_well->data != PUNIT_POWER_WELL_DPIO_CMN_D); 1194 1195 if (power_well->data == PUNIT_POWER_WELL_DPIO_CMN_BC) { 1196 phy = DPIO_PHY0; 1197 assert_pll_disabled(dev_priv, PIPE_A); 1198 assert_pll_disabled(dev_priv, PIPE_B); 1199 } else { 1200 phy = DPIO_PHY1; 1201 assert_pll_disabled(dev_priv, PIPE_C); 1202 } 1203 1204 dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy); 1205 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 1206 1207 vlv_set_power_well(dev_priv, power_well, false); 1208 1209 DRM_DEBUG_KMS("Disabled DPIO PHY%d (PHY_CONTROL=0x%08x)\n", 1210 phy, dev_priv->chv_phy_control); 1211 1212 /* PHY is fully reset now, so we can enable the PHY state asserts */ 1213 dev_priv->chv_phy_assert[phy] = true; 1214 1215 assert_chv_phy_status(dev_priv); 1216 } 1217 1218 static void assert_chv_phy_powergate(struct drm_i915_private *dev_priv, enum dpio_phy phy, 1219 enum dpio_channel ch, bool override, unsigned int mask) 1220 { 1221 enum pipe pipe = phy == DPIO_PHY0 ? PIPE_A : PIPE_C; 1222 u32 reg, val, expected, actual; 1223 1224 /* 1225 * The BIOS can leave the PHY is some weird state 1226 * where it doesn't fully power down some parts. 1227 * Disable the asserts until the PHY has been fully 1228 * reset (ie. the power well has been disabled at 1229 * least once). 1230 */ 1231 if (!dev_priv->chv_phy_assert[phy]) 1232 return; 1233 1234 if (ch == DPIO_CH0) 1235 reg = _CHV_CMN_DW0_CH0; 1236 else 1237 reg = _CHV_CMN_DW6_CH1; 1238 1239 mutex_lock(&dev_priv->sb_lock); 1240 val = vlv_dpio_read(dev_priv, pipe, reg); 1241 mutex_unlock(&dev_priv->sb_lock); 1242 1243 /* 1244 * This assumes !override is only used when the port is disabled. 1245 * All lanes should power down even without the override when 1246 * the port is disabled. 1247 */ 1248 if (!override || mask == 0xf) { 1249 expected = DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN; 1250 /* 1251 * If CH1 common lane is not active anymore 1252 * (eg. for pipe B DPLL) the entire channel will 1253 * shut down, which causes the common lane registers 1254 * to read as 0. That means we can't actually check 1255 * the lane power down status bits, but as the entire 1256 * register reads as 0 it's a good indication that the 1257 * channel is indeed entirely powered down. 1258 */ 1259 if (ch == DPIO_CH1 && val == 0) 1260 expected = 0; 1261 } else if (mask != 0x0) { 1262 expected = DPIO_ANYDL_POWERDOWN; 1263 } else { 1264 expected = 0; 1265 } 1266 1267 if (ch == DPIO_CH0) 1268 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH0; 1269 else 1270 actual = val >> DPIO_ANYDL_POWERDOWN_SHIFT_CH1; 1271 actual &= DPIO_ALLDL_POWERDOWN | DPIO_ANYDL_POWERDOWN; 1272 1273 WARN(actual != expected, 1274 "Unexpected DPIO lane power down: all %d, any %d. Expected: all %d, any %d. (0x%x = 0x%08x)\n", 1275 !!(actual & DPIO_ALLDL_POWERDOWN), !!(actual & DPIO_ANYDL_POWERDOWN), 1276 !!(expected & DPIO_ALLDL_POWERDOWN), !!(expected & DPIO_ANYDL_POWERDOWN), 1277 reg, val); 1278 } 1279 1280 bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy, 1281 enum dpio_channel ch, bool override) 1282 { 1283 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1284 bool was_override; 1285 1286 mutex_lock(&power_domains->lock); 1287 1288 was_override = dev_priv->chv_phy_control & PHY_CH_POWER_DOWN_OVRD_EN(phy, ch); 1289 1290 if (override == was_override) 1291 goto out; 1292 1293 if (override) 1294 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch); 1295 else 1296 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch); 1297 1298 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 1299 1300 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d (DPIO_PHY_CONTROL=0x%08x)\n", 1301 phy, ch, dev_priv->chv_phy_control); 1302 1303 assert_chv_phy_status(dev_priv); 1304 1305 out: 1306 mutex_unlock(&power_domains->lock); 1307 1308 return was_override; 1309 } 1310 1311 void chv_phy_powergate_lanes(struct intel_encoder *encoder, 1312 bool override, unsigned int mask) 1313 { 1314 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 1315 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1316 enum dpio_phy phy = vlv_dport_to_phy(enc_to_dig_port(&encoder->base)); 1317 enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base)); 1318 1319 mutex_lock(&power_domains->lock); 1320 1321 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD(0xf, phy, ch); 1322 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD(mask, phy, ch); 1323 1324 if (override) 1325 dev_priv->chv_phy_control |= PHY_CH_POWER_DOWN_OVRD_EN(phy, ch); 1326 else 1327 dev_priv->chv_phy_control &= ~PHY_CH_POWER_DOWN_OVRD_EN(phy, ch); 1328 1329 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 1330 1331 DRM_DEBUG_KMS("Power gating DPIO PHY%d CH%d lanes 0x%x (PHY_CONTROL=0x%08x)\n", 1332 phy, ch, mask, dev_priv->chv_phy_control); 1333 1334 assert_chv_phy_status(dev_priv); 1335 1336 assert_chv_phy_powergate(dev_priv, phy, ch, override, mask); 1337 1338 mutex_unlock(&power_domains->lock); 1339 } 1340 1341 static bool chv_pipe_power_well_enabled(struct drm_i915_private *dev_priv, 1342 struct i915_power_well *power_well) 1343 { 1344 enum pipe pipe = power_well->data; 1345 bool enabled; 1346 u32 state, ctrl; 1347 1348 mutex_lock(&dev_priv->rps.hw_lock); 1349 1350 state = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe); 1351 /* 1352 * We only ever set the power-on and power-gate states, anything 1353 * else is unexpected. 1354 */ 1355 WARN_ON(state != DP_SSS_PWR_ON(pipe) && state != DP_SSS_PWR_GATE(pipe)); 1356 enabled = state == DP_SSS_PWR_ON(pipe); 1357 1358 /* 1359 * A transient state at this point would mean some unexpected party 1360 * is poking at the power controls too. 1361 */ 1362 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSC_MASK(pipe); 1363 WARN_ON(ctrl << 16 != state); 1364 1365 mutex_unlock(&dev_priv->rps.hw_lock); 1366 1367 return enabled; 1368 } 1369 1370 static void chv_set_pipe_power_well(struct drm_i915_private *dev_priv, 1371 struct i915_power_well *power_well, 1372 bool enable) 1373 { 1374 enum pipe pipe = power_well->data; 1375 u32 state; 1376 u32 ctrl; 1377 1378 state = enable ? DP_SSS_PWR_ON(pipe) : DP_SSS_PWR_GATE(pipe); 1379 1380 mutex_lock(&dev_priv->rps.hw_lock); 1381 1382 #define COND \ 1383 ((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) & DP_SSS_MASK(pipe)) == state) 1384 1385 if (COND) 1386 goto out; 1387 1388 ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); 1389 ctrl &= ~DP_SSC_MASK(pipe); 1390 ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe); 1391 vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, ctrl); 1392 1393 if (wait_for(COND, 100)) 1394 DRM_ERROR("timeout setting power well state %08x (%08x)\n", 1395 state, 1396 vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ)); 1397 1398 #undef COND 1399 1400 out: 1401 mutex_unlock(&dev_priv->rps.hw_lock); 1402 } 1403 1404 static void chv_pipe_power_well_sync_hw(struct drm_i915_private *dev_priv, 1405 struct i915_power_well *power_well) 1406 { 1407 WARN_ON_ONCE(power_well->data != PIPE_A); 1408 1409 chv_set_pipe_power_well(dev_priv, power_well, power_well->count > 0); 1410 } 1411 1412 static void chv_pipe_power_well_enable(struct drm_i915_private *dev_priv, 1413 struct i915_power_well *power_well) 1414 { 1415 WARN_ON_ONCE(power_well->data != PIPE_A); 1416 1417 chv_set_pipe_power_well(dev_priv, power_well, true); 1418 1419 vlv_display_power_well_init(dev_priv); 1420 } 1421 1422 static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv, 1423 struct i915_power_well *power_well) 1424 { 1425 WARN_ON_ONCE(power_well->data != PIPE_A); 1426 1427 vlv_display_power_well_deinit(dev_priv); 1428 1429 chv_set_pipe_power_well(dev_priv, power_well, false); 1430 } 1431 1432 /** 1433 * intel_display_power_get - grab a power domain reference 1434 * @dev_priv: i915 device instance 1435 * @domain: power domain to reference 1436 * 1437 * This function grabs a power domain reference for @domain and ensures that the 1438 * power domain and all its parents are powered up. Therefore users should only 1439 * grab a reference to the innermost power domain they need. 1440 * 1441 * Any power domain reference obtained by this function must have a symmetric 1442 * call to intel_display_power_put() to release the reference again. 1443 */ 1444 void intel_display_power_get(struct drm_i915_private *dev_priv, 1445 enum intel_display_power_domain domain) 1446 { 1447 struct i915_power_domains *power_domains; 1448 struct i915_power_well *power_well; 1449 int i; 1450 1451 intel_runtime_pm_get(dev_priv); 1452 1453 power_domains = &dev_priv->power_domains; 1454 1455 mutex_lock(&power_domains->lock); 1456 1457 for_each_power_well(i, power_well, BIT(domain), power_domains) { 1458 if (!power_well->count++) 1459 intel_power_well_enable(dev_priv, power_well); 1460 } 1461 1462 power_domains->domain_use_count[domain]++; 1463 1464 mutex_unlock(&power_domains->lock); 1465 } 1466 1467 /** 1468 * intel_display_power_put - release a power domain reference 1469 * @dev_priv: i915 device instance 1470 * @domain: power domain to reference 1471 * 1472 * This function drops the power domain reference obtained by 1473 * intel_display_power_get() and might power down the corresponding hardware 1474 * block right away if this is the last reference. 1475 */ 1476 void intel_display_power_put(struct drm_i915_private *dev_priv, 1477 enum intel_display_power_domain domain) 1478 { 1479 struct i915_power_domains *power_domains; 1480 struct i915_power_well *power_well; 1481 int i; 1482 1483 power_domains = &dev_priv->power_domains; 1484 1485 mutex_lock(&power_domains->lock); 1486 1487 WARN_ON(!power_domains->domain_use_count[domain]); 1488 power_domains->domain_use_count[domain]--; 1489 1490 for_each_power_well_rev(i, power_well, BIT(domain), power_domains) { 1491 WARN_ON(!power_well->count); 1492 1493 if (!--power_well->count && i915.disable_power_well) 1494 intel_power_well_disable(dev_priv, power_well); 1495 } 1496 1497 mutex_unlock(&power_domains->lock); 1498 1499 intel_runtime_pm_put(dev_priv); 1500 } 1501 1502 #define HSW_ALWAYS_ON_POWER_DOMAINS ( \ 1503 BIT(POWER_DOMAIN_PIPE_A) | \ 1504 BIT(POWER_DOMAIN_TRANSCODER_EDP) | \ 1505 BIT(POWER_DOMAIN_PORT_DDI_A_2_LANES) | \ 1506 BIT(POWER_DOMAIN_PORT_DDI_A_4_LANES) | \ 1507 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1508 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1509 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1510 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1511 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 1512 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 1513 BIT(POWER_DOMAIN_PORT_CRT) | \ 1514 BIT(POWER_DOMAIN_PLLS) | \ 1515 BIT(POWER_DOMAIN_AUX_A) | \ 1516 BIT(POWER_DOMAIN_AUX_B) | \ 1517 BIT(POWER_DOMAIN_AUX_C) | \ 1518 BIT(POWER_DOMAIN_AUX_D) | \ 1519 BIT(POWER_DOMAIN_GMBUS) | \ 1520 BIT(POWER_DOMAIN_INIT)) 1521 #define HSW_DISPLAY_POWER_DOMAINS ( \ 1522 (POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) | \ 1523 BIT(POWER_DOMAIN_INIT)) 1524 1525 #define BDW_ALWAYS_ON_POWER_DOMAINS ( \ 1526 HSW_ALWAYS_ON_POWER_DOMAINS | \ 1527 BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER)) 1528 #define BDW_DISPLAY_POWER_DOMAINS ( \ 1529 (POWER_DOMAIN_MASK & ~BDW_ALWAYS_ON_POWER_DOMAINS) | \ 1530 BIT(POWER_DOMAIN_INIT)) 1531 1532 #define VLV_ALWAYS_ON_POWER_DOMAINS BIT(POWER_DOMAIN_INIT) 1533 #define VLV_DISPLAY_POWER_DOMAINS POWER_DOMAIN_MASK 1534 1535 #define VLV_DPIO_CMN_BC_POWER_DOMAINS ( \ 1536 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1537 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1538 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1539 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1540 BIT(POWER_DOMAIN_PORT_CRT) | \ 1541 BIT(POWER_DOMAIN_AUX_B) | \ 1542 BIT(POWER_DOMAIN_AUX_C) | \ 1543 BIT(POWER_DOMAIN_INIT)) 1544 1545 #define VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS ( \ 1546 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1547 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1548 BIT(POWER_DOMAIN_AUX_B) | \ 1549 BIT(POWER_DOMAIN_INIT)) 1550 1551 #define VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS ( \ 1552 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1553 BIT(POWER_DOMAIN_AUX_B) | \ 1554 BIT(POWER_DOMAIN_INIT)) 1555 1556 #define VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS ( \ 1557 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1558 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1559 BIT(POWER_DOMAIN_AUX_C) | \ 1560 BIT(POWER_DOMAIN_INIT)) 1561 1562 #define VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS ( \ 1563 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1564 BIT(POWER_DOMAIN_AUX_C) | \ 1565 BIT(POWER_DOMAIN_INIT)) 1566 1567 #define CHV_DPIO_CMN_BC_POWER_DOMAINS ( \ 1568 BIT(POWER_DOMAIN_PORT_DDI_B_2_LANES) | \ 1569 BIT(POWER_DOMAIN_PORT_DDI_B_4_LANES) | \ 1570 BIT(POWER_DOMAIN_PORT_DDI_C_2_LANES) | \ 1571 BIT(POWER_DOMAIN_PORT_DDI_C_4_LANES) | \ 1572 BIT(POWER_DOMAIN_AUX_B) | \ 1573 BIT(POWER_DOMAIN_AUX_C) | \ 1574 BIT(POWER_DOMAIN_INIT)) 1575 1576 #define CHV_DPIO_CMN_D_POWER_DOMAINS ( \ 1577 BIT(POWER_DOMAIN_PORT_DDI_D_2_LANES) | \ 1578 BIT(POWER_DOMAIN_PORT_DDI_D_4_LANES) | \ 1579 BIT(POWER_DOMAIN_AUX_D) | \ 1580 BIT(POWER_DOMAIN_INIT)) 1581 1582 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = { 1583 .sync_hw = i9xx_always_on_power_well_noop, 1584 .enable = i9xx_always_on_power_well_noop, 1585 .disable = i9xx_always_on_power_well_noop, 1586 .is_enabled = i9xx_always_on_power_well_enabled, 1587 }; 1588 1589 static const struct i915_power_well_ops chv_pipe_power_well_ops = { 1590 .sync_hw = chv_pipe_power_well_sync_hw, 1591 .enable = chv_pipe_power_well_enable, 1592 .disable = chv_pipe_power_well_disable, 1593 .is_enabled = chv_pipe_power_well_enabled, 1594 }; 1595 1596 static const struct i915_power_well_ops chv_dpio_cmn_power_well_ops = { 1597 .sync_hw = vlv_power_well_sync_hw, 1598 .enable = chv_dpio_cmn_power_well_enable, 1599 .disable = chv_dpio_cmn_power_well_disable, 1600 .is_enabled = vlv_power_well_enabled, 1601 }; 1602 1603 static struct i915_power_well i9xx_always_on_power_well[] = { 1604 { 1605 .name = "always-on", 1606 .always_on = 1, 1607 .domains = POWER_DOMAIN_MASK, 1608 .ops = &i9xx_always_on_power_well_ops, 1609 }, 1610 }; 1611 1612 static const struct i915_power_well_ops hsw_power_well_ops = { 1613 .sync_hw = hsw_power_well_sync_hw, 1614 .enable = hsw_power_well_enable, 1615 .disable = hsw_power_well_disable, 1616 .is_enabled = hsw_power_well_enabled, 1617 }; 1618 1619 static const struct i915_power_well_ops skl_power_well_ops = { 1620 .sync_hw = skl_power_well_sync_hw, 1621 .enable = skl_power_well_enable, 1622 .disable = skl_power_well_disable, 1623 .is_enabled = skl_power_well_enabled, 1624 }; 1625 1626 static struct i915_power_well hsw_power_wells[] = { 1627 { 1628 .name = "always-on", 1629 .always_on = 1, 1630 .domains = HSW_ALWAYS_ON_POWER_DOMAINS, 1631 .ops = &i9xx_always_on_power_well_ops, 1632 }, 1633 { 1634 .name = "display", 1635 .domains = HSW_DISPLAY_POWER_DOMAINS, 1636 .ops = &hsw_power_well_ops, 1637 }, 1638 }; 1639 1640 static struct i915_power_well bdw_power_wells[] = { 1641 { 1642 .name = "always-on", 1643 .always_on = 1, 1644 .domains = BDW_ALWAYS_ON_POWER_DOMAINS, 1645 .ops = &i9xx_always_on_power_well_ops, 1646 }, 1647 { 1648 .name = "display", 1649 .domains = BDW_DISPLAY_POWER_DOMAINS, 1650 .ops = &hsw_power_well_ops, 1651 }, 1652 }; 1653 1654 static const struct i915_power_well_ops vlv_display_power_well_ops = { 1655 .sync_hw = vlv_power_well_sync_hw, 1656 .enable = vlv_display_power_well_enable, 1657 .disable = vlv_display_power_well_disable, 1658 .is_enabled = vlv_power_well_enabled, 1659 }; 1660 1661 static const struct i915_power_well_ops vlv_dpio_cmn_power_well_ops = { 1662 .sync_hw = vlv_power_well_sync_hw, 1663 .enable = vlv_dpio_cmn_power_well_enable, 1664 .disable = vlv_dpio_cmn_power_well_disable, 1665 .is_enabled = vlv_power_well_enabled, 1666 }; 1667 1668 static const struct i915_power_well_ops vlv_dpio_power_well_ops = { 1669 .sync_hw = vlv_power_well_sync_hw, 1670 .enable = vlv_power_well_enable, 1671 .disable = vlv_power_well_disable, 1672 .is_enabled = vlv_power_well_enabled, 1673 }; 1674 1675 static struct i915_power_well vlv_power_wells[] = { 1676 { 1677 .name = "always-on", 1678 .always_on = 1, 1679 .domains = VLV_ALWAYS_ON_POWER_DOMAINS, 1680 .ops = &i9xx_always_on_power_well_ops, 1681 }, 1682 { 1683 .name = "display", 1684 .domains = VLV_DISPLAY_POWER_DOMAINS, 1685 .data = PUNIT_POWER_WELL_DISP2D, 1686 .ops = &vlv_display_power_well_ops, 1687 }, 1688 { 1689 .name = "dpio-tx-b-01", 1690 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1691 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1692 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1693 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1694 .ops = &vlv_dpio_power_well_ops, 1695 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_01, 1696 }, 1697 { 1698 .name = "dpio-tx-b-23", 1699 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1700 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1701 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1702 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1703 .ops = &vlv_dpio_power_well_ops, 1704 .data = PUNIT_POWER_WELL_DPIO_TX_B_LANES_23, 1705 }, 1706 { 1707 .name = "dpio-tx-c-01", 1708 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1709 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1710 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1711 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1712 .ops = &vlv_dpio_power_well_ops, 1713 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_01, 1714 }, 1715 { 1716 .name = "dpio-tx-c-23", 1717 .domains = VLV_DPIO_TX_B_LANES_01_POWER_DOMAINS | 1718 VLV_DPIO_TX_B_LANES_23_POWER_DOMAINS | 1719 VLV_DPIO_TX_C_LANES_01_POWER_DOMAINS | 1720 VLV_DPIO_TX_C_LANES_23_POWER_DOMAINS, 1721 .ops = &vlv_dpio_power_well_ops, 1722 .data = PUNIT_POWER_WELL_DPIO_TX_C_LANES_23, 1723 }, 1724 { 1725 .name = "dpio-common", 1726 .domains = VLV_DPIO_CMN_BC_POWER_DOMAINS, 1727 .data = PUNIT_POWER_WELL_DPIO_CMN_BC, 1728 .ops = &vlv_dpio_cmn_power_well_ops, 1729 }, 1730 }; 1731 1732 static struct i915_power_well chv_power_wells[] = { 1733 { 1734 .name = "always-on", 1735 .always_on = 1, 1736 .domains = VLV_ALWAYS_ON_POWER_DOMAINS, 1737 .ops = &i9xx_always_on_power_well_ops, 1738 }, 1739 { 1740 .name = "display", 1741 /* 1742 * Pipe A power well is the new disp2d well. Pipe B and C 1743 * power wells don't actually exist. Pipe A power well is 1744 * required for any pipe to work. 1745 */ 1746 .domains = VLV_DISPLAY_POWER_DOMAINS, 1747 .data = PIPE_A, 1748 .ops = &chv_pipe_power_well_ops, 1749 }, 1750 { 1751 .name = "dpio-common-bc", 1752 .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS, 1753 .data = PUNIT_POWER_WELL_DPIO_CMN_BC, 1754 .ops = &chv_dpio_cmn_power_well_ops, 1755 }, 1756 { 1757 .name = "dpio-common-d", 1758 .domains = CHV_DPIO_CMN_D_POWER_DOMAINS, 1759 .data = PUNIT_POWER_WELL_DPIO_CMN_D, 1760 .ops = &chv_dpio_cmn_power_well_ops, 1761 }, 1762 }; 1763 1764 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv, 1765 int power_well_id) 1766 { 1767 struct i915_power_well *power_well; 1768 bool ret; 1769 1770 power_well = lookup_power_well(dev_priv, power_well_id); 1771 ret = power_well->ops->is_enabled(dev_priv, power_well); 1772 1773 return ret; 1774 } 1775 1776 static struct i915_power_well skl_power_wells[] = { 1777 { 1778 .name = "always-on", 1779 .always_on = 1, 1780 .domains = SKL_DISPLAY_ALWAYS_ON_POWER_DOMAINS, 1781 .ops = &i9xx_always_on_power_well_ops, 1782 }, 1783 { 1784 .name = "power well 1", 1785 .domains = SKL_DISPLAY_POWERWELL_1_POWER_DOMAINS, 1786 .ops = &skl_power_well_ops, 1787 .data = SKL_DISP_PW_1, 1788 }, 1789 { 1790 .name = "MISC IO power well", 1791 .domains = SKL_DISPLAY_MISC_IO_POWER_DOMAINS, 1792 .ops = &skl_power_well_ops, 1793 .data = SKL_DISP_PW_MISC_IO, 1794 }, 1795 { 1796 .name = "power well 2", 1797 .domains = SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS, 1798 .ops = &skl_power_well_ops, 1799 .data = SKL_DISP_PW_2, 1800 }, 1801 { 1802 .name = "DDI A/E power well", 1803 .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS, 1804 .ops = &skl_power_well_ops, 1805 .data = SKL_DISP_PW_DDI_A_E, 1806 }, 1807 { 1808 .name = "DDI B power well", 1809 .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS, 1810 .ops = &skl_power_well_ops, 1811 .data = SKL_DISP_PW_DDI_B, 1812 }, 1813 { 1814 .name = "DDI C power well", 1815 .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS, 1816 .ops = &skl_power_well_ops, 1817 .data = SKL_DISP_PW_DDI_C, 1818 }, 1819 { 1820 .name = "DDI D power well", 1821 .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS, 1822 .ops = &skl_power_well_ops, 1823 .data = SKL_DISP_PW_DDI_D, 1824 }, 1825 }; 1826 1827 static struct i915_power_well bxt_power_wells[] = { 1828 { 1829 .name = "always-on", 1830 .always_on = 1, 1831 .domains = BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS, 1832 .ops = &i9xx_always_on_power_well_ops, 1833 }, 1834 { 1835 .name = "power well 1", 1836 .domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS, 1837 .ops = &skl_power_well_ops, 1838 .data = SKL_DISP_PW_1, 1839 }, 1840 { 1841 .name = "power well 2", 1842 .domains = BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS, 1843 .ops = &skl_power_well_ops, 1844 .data = SKL_DISP_PW_2, 1845 } 1846 }; 1847 1848 static int 1849 sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv, 1850 int disable_power_well) 1851 { 1852 if (disable_power_well >= 0) 1853 return !!disable_power_well; 1854 1855 if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) { 1856 DRM_DEBUG_KMS("Disabling display power well support\n"); 1857 return 0; 1858 } 1859 1860 return 1; 1861 } 1862 1863 #define set_power_wells(power_domains, __power_wells) ({ \ 1864 (power_domains)->power_wells = (__power_wells); \ 1865 (power_domains)->power_well_count = ARRAY_SIZE(__power_wells); \ 1866 }) 1867 1868 /** 1869 * intel_power_domains_init - initializes the power domain structures 1870 * @dev_priv: i915 device instance 1871 * 1872 * Initializes the power domain structures for @dev_priv depending upon the 1873 * supported platform. 1874 */ 1875 int intel_power_domains_init(struct drm_i915_private *dev_priv) 1876 { 1877 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1878 1879 i915.disable_power_well = sanitize_disable_power_well_option(dev_priv, 1880 i915.disable_power_well); 1881 1882 BUILD_BUG_ON(POWER_DOMAIN_NUM > 31); 1883 1884 mutex_init(&power_domains->lock); 1885 1886 /* 1887 * The enabling order will be from lower to higher indexed wells, 1888 * the disabling order is reversed. 1889 */ 1890 if (IS_HASWELL(dev_priv->dev)) { 1891 set_power_wells(power_domains, hsw_power_wells); 1892 } else if (IS_BROADWELL(dev_priv->dev)) { 1893 set_power_wells(power_domains, bdw_power_wells); 1894 } else if (IS_SKYLAKE(dev_priv->dev) || IS_KABYLAKE(dev_priv->dev)) { 1895 set_power_wells(power_domains, skl_power_wells); 1896 } else if (IS_BROXTON(dev_priv->dev)) { 1897 set_power_wells(power_domains, bxt_power_wells); 1898 } else if (IS_CHERRYVIEW(dev_priv->dev)) { 1899 set_power_wells(power_domains, chv_power_wells); 1900 } else if (IS_VALLEYVIEW(dev_priv->dev)) { 1901 set_power_wells(power_domains, vlv_power_wells); 1902 } else { 1903 set_power_wells(power_domains, i9xx_always_on_power_well); 1904 } 1905 1906 return 0; 1907 } 1908 1909 static void intel_runtime_pm_disable(struct drm_i915_private *dev_priv) 1910 { 1911 struct drm_device *dev = dev_priv->dev; 1912 struct device *device = dev->dev; 1913 1914 if (!HAS_RUNTIME_PM(dev)) 1915 return; 1916 1917 if (!intel_enable_rc6(dev)) 1918 return; 1919 1920 /* Make sure we're not suspended first. */ 1921 pm_runtime_get_sync(device); 1922 } 1923 1924 /** 1925 * intel_power_domains_fini - finalizes the power domain structures 1926 * @dev_priv: i915 device instance 1927 * 1928 * Finalizes the power domain structures for @dev_priv depending upon the 1929 * supported platform. This function also disables runtime pm and ensures that 1930 * the device stays powered up so that the driver can be reloaded. 1931 */ 1932 void intel_power_domains_fini(struct drm_i915_private *dev_priv) 1933 { 1934 intel_runtime_pm_disable(dev_priv); 1935 1936 /* The i915.ko module is still not prepared to be loaded when 1937 * the power well is not enabled, so just enable it in case 1938 * we're going to unload/reload. */ 1939 intel_display_set_init_power(dev_priv, true); 1940 1941 mutex_destroy(&dev_priv->power_domains.lock); 1942 } 1943 1944 static void intel_power_domains_resume(struct drm_i915_private *dev_priv) 1945 { 1946 struct i915_power_domains *power_domains = &dev_priv->power_domains; 1947 struct i915_power_well *power_well; 1948 int i; 1949 1950 mutex_lock(&power_domains->lock); 1951 for_each_power_well(i, power_well, POWER_DOMAIN_MASK, power_domains) { 1952 power_well->ops->sync_hw(dev_priv, power_well); 1953 power_well->hw_enabled = power_well->ops->is_enabled(dev_priv, 1954 power_well); 1955 } 1956 mutex_unlock(&power_domains->lock); 1957 } 1958 1959 static void chv_phy_control_init(struct drm_i915_private *dev_priv) 1960 { 1961 struct i915_power_well *cmn_bc = 1962 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC); 1963 struct i915_power_well *cmn_d = 1964 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D); 1965 1966 /* 1967 * DISPLAY_PHY_CONTROL can get corrupted if read. As a 1968 * workaround never ever read DISPLAY_PHY_CONTROL, and 1969 * instead maintain a shadow copy ourselves. Use the actual 1970 * power well state and lane status to reconstruct the 1971 * expected initial value. 1972 */ 1973 dev_priv->chv_phy_control = 1974 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY0) | 1975 PHY_LDO_SEQ_DELAY(PHY_LDO_DELAY_600NS, DPIO_PHY1) | 1976 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH0) | 1977 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY0, DPIO_CH1) | 1978 PHY_CH_POWER_MODE(PHY_CH_DEEP_PSR, DPIO_PHY1, DPIO_CH0); 1979 1980 /* 1981 * If all lanes are disabled we leave the override disabled 1982 * with all power down bits cleared to match the state we 1983 * would use after disabling the port. Otherwise enable the 1984 * override and set the lane powerdown bits accding to the 1985 * current lane status. 1986 */ 1987 if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc)) { 1988 uint32_t status = I915_READ(DPLL(PIPE_A)); 1989 unsigned int mask; 1990 1991 mask = status & DPLL_PORTB_READY_MASK; 1992 if (mask == 0xf) 1993 mask = 0x0; 1994 else 1995 dev_priv->chv_phy_control |= 1996 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH0); 1997 1998 dev_priv->chv_phy_control |= 1999 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH0); 2000 2001 mask = (status & DPLL_PORTC_READY_MASK) >> 4; 2002 if (mask == 0xf) 2003 mask = 0x0; 2004 else 2005 dev_priv->chv_phy_control |= 2006 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY0, DPIO_CH1); 2007 2008 dev_priv->chv_phy_control |= 2009 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY0, DPIO_CH1); 2010 2011 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0); 2012 2013 dev_priv->chv_phy_assert[DPIO_PHY0] = false; 2014 } else { 2015 dev_priv->chv_phy_assert[DPIO_PHY0] = true; 2016 } 2017 2018 if (cmn_d->ops->is_enabled(dev_priv, cmn_d)) { 2019 uint32_t status = I915_READ(DPIO_PHY_STATUS); 2020 unsigned int mask; 2021 2022 mask = status & DPLL_PORTD_READY_MASK; 2023 2024 if (mask == 0xf) 2025 mask = 0x0; 2026 else 2027 dev_priv->chv_phy_control |= 2028 PHY_CH_POWER_DOWN_OVRD_EN(DPIO_PHY1, DPIO_CH0); 2029 2030 dev_priv->chv_phy_control |= 2031 PHY_CH_POWER_DOWN_OVRD(mask, DPIO_PHY1, DPIO_CH0); 2032 2033 dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1); 2034 2035 dev_priv->chv_phy_assert[DPIO_PHY1] = false; 2036 } else { 2037 dev_priv->chv_phy_assert[DPIO_PHY1] = true; 2038 } 2039 2040 I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control); 2041 2042 DRM_DEBUG_KMS("Initial PHY_CONTROL=0x%08x\n", 2043 dev_priv->chv_phy_control); 2044 } 2045 2046 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv) 2047 { 2048 struct i915_power_well *cmn = 2049 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC); 2050 struct i915_power_well *disp2d = 2051 lookup_power_well(dev_priv, PUNIT_POWER_WELL_DISP2D); 2052 2053 /* If the display might be already active skip this */ 2054 if (cmn->ops->is_enabled(dev_priv, cmn) && 2055 disp2d->ops->is_enabled(dev_priv, disp2d) && 2056 I915_READ(DPIO_CTL) & DPIO_CMNRST) 2057 return; 2058 2059 DRM_DEBUG_KMS("toggling display PHY side reset\n"); 2060 2061 /* cmnlane needs DPLL registers */ 2062 disp2d->ops->enable(dev_priv, disp2d); 2063 2064 /* 2065 * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx: 2066 * Need to assert and de-assert PHY SB reset by gating the 2067 * common lane power, then un-gating it. 2068 * Simply ungating isn't enough to reset the PHY enough to get 2069 * ports and lanes running. 2070 */ 2071 cmn->ops->disable(dev_priv, cmn); 2072 } 2073 2074 /** 2075 * intel_power_domains_init_hw - initialize hardware power domain state 2076 * @dev_priv: i915 device instance 2077 * 2078 * This function initializes the hardware power domain state and enables all 2079 * power domains using intel_display_set_init_power(). 2080 */ 2081 void intel_power_domains_init_hw(struct drm_i915_private *dev_priv) 2082 { 2083 struct drm_device *dev = dev_priv->dev; 2084 struct i915_power_domains *power_domains = &dev_priv->power_domains; 2085 2086 power_domains->initializing = true; 2087 2088 if (IS_CHERRYVIEW(dev)) { 2089 mutex_lock(&power_domains->lock); 2090 chv_phy_control_init(dev_priv); 2091 mutex_unlock(&power_domains->lock); 2092 } else if (IS_VALLEYVIEW(dev)) { 2093 mutex_lock(&power_domains->lock); 2094 vlv_cmnlane_wa(dev_priv); 2095 mutex_unlock(&power_domains->lock); 2096 } 2097 2098 /* For now, we need the power well to be always enabled. */ 2099 intel_display_set_init_power(dev_priv, true); 2100 intel_power_domains_resume(dev_priv); 2101 power_domains->initializing = false; 2102 } 2103 2104 /** 2105 * intel_runtime_pm_get - grab a runtime pm reference 2106 * @dev_priv: i915 device instance 2107 * 2108 * This function grabs a device-level runtime pm reference (mostly used for GEM 2109 * code to ensure the GTT or GT is on) and ensures that it is powered up. 2110 * 2111 * Any runtime pm reference obtained by this function must have a symmetric 2112 * call to intel_runtime_pm_put() to release the reference again. 2113 */ 2114 void intel_runtime_pm_get(struct drm_i915_private *dev_priv) 2115 { 2116 struct drm_device *dev = dev_priv->dev; 2117 struct device *device = dev->dev; 2118 2119 if (!HAS_RUNTIME_PM(dev)) 2120 return; 2121 2122 pm_runtime_get_sync(device); 2123 WARN(dev_priv->pm.suspended, "Device still suspended.\n"); 2124 } 2125 2126 /** 2127 * intel_runtime_pm_get_noresume - grab a runtime pm reference 2128 * @dev_priv: i915 device instance 2129 * 2130 * This function grabs a device-level runtime pm reference (mostly used for GEM 2131 * code to ensure the GTT or GT is on). 2132 * 2133 * It will _not_ power up the device but instead only check that it's powered 2134 * on. Therefore it is only valid to call this functions from contexts where 2135 * the device is known to be powered up and where trying to power it up would 2136 * result in hilarity and deadlocks. That pretty much means only the system 2137 * suspend/resume code where this is used to grab runtime pm references for 2138 * delayed setup down in work items. 2139 * 2140 * Any runtime pm reference obtained by this function must have a symmetric 2141 * call to intel_runtime_pm_put() to release the reference again. 2142 */ 2143 void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv) 2144 { 2145 struct drm_device *dev = dev_priv->dev; 2146 struct device *device = dev->dev; 2147 2148 if (!HAS_RUNTIME_PM(dev)) 2149 return; 2150 2151 WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n"); 2152 pm_runtime_get_noresume(device); 2153 } 2154 2155 /** 2156 * intel_runtime_pm_put - release a runtime pm reference 2157 * @dev_priv: i915 device instance 2158 * 2159 * This function drops the device-level runtime pm reference obtained by 2160 * intel_runtime_pm_get() and might power down the corresponding 2161 * hardware block right away if this is the last reference. 2162 */ 2163 void intel_runtime_pm_put(struct drm_i915_private *dev_priv) 2164 { 2165 struct drm_device *dev = dev_priv->dev; 2166 struct device *device = dev->dev; 2167 2168 if (!HAS_RUNTIME_PM(dev)) 2169 return; 2170 2171 pm_runtime_mark_last_busy(device); 2172 pm_runtime_put_autosuspend(device); 2173 } 2174 2175 /** 2176 * intel_runtime_pm_enable - enable runtime pm 2177 * @dev_priv: i915 device instance 2178 * 2179 * This function enables runtime pm at the end of the driver load sequence. 2180 * 2181 * Note that this function does currently not enable runtime pm for the 2182 * subordinate display power domains. That is only done on the first modeset 2183 * using intel_display_set_init_power(). 2184 */ 2185 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv) 2186 { 2187 struct drm_device *dev = dev_priv->dev; 2188 struct device *device = dev->dev; 2189 2190 if (!HAS_RUNTIME_PM(dev)) 2191 return; 2192 2193 /* 2194 * RPM depends on RC6 to save restore the GT HW context, so make RC6 a 2195 * requirement. 2196 */ 2197 if (!intel_enable_rc6(dev)) { 2198 DRM_INFO("RC6 disabled, disabling runtime PM support\n"); 2199 return; 2200 } 2201 2202 pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */ 2203 pm_runtime_mark_last_busy(device); 2204 pm_runtime_use_autosuspend(device); 2205 2206 pm_runtime_put_autosuspend(device); 2207 } 2208