2 * Copyright © 2014 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
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11 * The above copyright notice and this permission notice (including the next
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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
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19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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21 * DEALINGS IN THE SOFTWARE.
25 * DOC: Panel Self Refresh (PSR/SRD)
27 * Since Haswell Display controller supports Panel Self-Refresh on display
28 * panels witch have a remote frame buffer (RFB) implemented according to PSR
29 * spec in eDP1.3. PSR feature allows the display to go to lower standby states
30 * when system is idle but display is on as it eliminates display refresh
31 * request to DDR memory completely as long as the frame buffer for that
32 * display is unchanged.
34 * Panel Self Refresh must be supported by both Hardware (source) and
37 * PSR saves power by caching the framebuffer in the panel RFB, which allows us
38 * to power down the link and memory controller. For DSI panels the same idea
39 * is called "manual mode".
41 * The implementation uses the hardware-based PSR support which automatically
42 * enters/exits self-refresh mode. The hardware takes care of sending the
43 * required DP aux message and could even retrain the link (that part isn't
44 * enabled yet though). The hardware also keeps track of any frontbuffer
45 * changes to know when to exit self-refresh mode again. Unfortunately that
46 * part doesn't work too well, hence why the i915 PSR support uses the
47 * software frontbuffer tracking to make sure it doesn't miss a screen
48 * update. For this integration intel_psr_invalidate() and intel_psr_flush()
49 * get called by the frontbuffer tracking code. Note that because of locking
50 * issues the self-refresh re-enable code is done from a work queue, which
51 * must be correctly synchronized/cancelled when shutting down the pipe."
56 #include "intel_drv.h"
59 static bool is_edp_psr(struct intel_dp *intel_dp)
61 return intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED;
64 static bool vlv_is_psr_active_on_pipe(struct drm_device *dev, int pipe)
66 struct drm_i915_private *dev_priv = dev->dev_private;
69 val = I915_READ(VLV_PSRSTAT(pipe)) &
70 VLV_EDP_PSR_CURR_STATE_MASK;
71 return (val == VLV_EDP_PSR_ACTIVE_NORFB_UP) ||
72 (val == VLV_EDP_PSR_ACTIVE_SF_UPDATE);
75 static void intel_psr_write_vsc(struct intel_dp *intel_dp,
76 struct edp_vsc_psr *vsc_psr)
78 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
79 struct drm_device *dev = dig_port->base.base.dev;
80 struct drm_i915_private *dev_priv = dev->dev_private;
81 struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
82 u32 ctl_reg = HSW_TVIDEO_DIP_CTL(crtc->config.cpu_transcoder);
83 u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(crtc->config.cpu_transcoder);
84 uint32_t *data = (uint32_t *) vsc_psr;
87 /* As per BSPec (Pipe Video Data Island Packet), we need to disable
88 the video DIP being updated before program video DIP data buffer
89 registers for DIP being updated. */
90 I915_WRITE(ctl_reg, 0);
91 POSTING_READ(ctl_reg);
93 for (i = 0; i < VIDEO_DIP_VSC_DATA_SIZE; i += 4) {
94 if (i < sizeof(struct edp_vsc_psr))
95 I915_WRITE(data_reg + i, *data++);
97 I915_WRITE(data_reg + i, 0);
100 I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
101 POSTING_READ(ctl_reg);
104 static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
106 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
107 struct drm_device *dev = intel_dig_port->base.base.dev;
108 struct drm_i915_private *dev_priv = dev->dev_private;
109 struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
110 enum pipe pipe = to_intel_crtc(crtc)->pipe;
113 /* VLV auto-generate VSC package as per EDP 1.3 spec, Table 3.10 */
114 val = I915_READ(VLV_VSCSDP(pipe));
115 val &= ~VLV_EDP_PSR_SDP_FREQ_MASK;
116 val |= VLV_EDP_PSR_SDP_FREQ_EVFRAME;
117 I915_WRITE(VLV_VSCSDP(pipe), val);
120 static void hsw_psr_setup_vsc(struct intel_dp *intel_dp)
122 struct edp_vsc_psr psr_vsc;
124 /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
125 memset(&psr_vsc, 0, sizeof(psr_vsc));
126 psr_vsc.sdp_header.HB0 = 0;
127 psr_vsc.sdp_header.HB1 = 0x7;
128 psr_vsc.sdp_header.HB2 = 0x2;
129 psr_vsc.sdp_header.HB3 = 0x8;
130 intel_psr_write_vsc(intel_dp, &psr_vsc);
133 static void vlv_psr_enable_sink(struct intel_dp *intel_dp)
135 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
139 static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
141 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
142 struct drm_device *dev = dig_port->base.base.dev;
143 struct drm_i915_private *dev_priv = dev->dev_private;
144 uint32_t aux_clock_divider;
146 bool only_standby = dev_priv->vbt.psr.full_link;
147 static const uint8_t aux_msg[] = {
148 [0] = DP_AUX_NATIVE_WRITE << 4,
149 [1] = DP_SET_POWER >> 8,
150 [2] = DP_SET_POWER & 0xff,
152 [4] = DP_SET_POWER_D0,
156 BUILD_BUG_ON(sizeof(aux_msg) > 20);
158 aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
160 if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
163 /* Enable PSR in sink */
164 if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby)
165 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
166 DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
168 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
169 DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
171 /* Setup AUX registers */
172 for (i = 0; i < sizeof(aux_msg); i += 4)
173 I915_WRITE(EDP_PSR_AUX_DATA1(dev) + i,
174 intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
176 I915_WRITE(EDP_PSR_AUX_CTL(dev),
177 DP_AUX_CH_CTL_TIME_OUT_400us |
178 (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
179 (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
180 (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
183 static void vlv_psr_enable_source(struct intel_dp *intel_dp)
185 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
186 struct drm_device *dev = dig_port->base.base.dev;
187 struct drm_i915_private *dev_priv = dev->dev_private;
188 struct drm_crtc *crtc = dig_port->base.base.crtc;
189 enum pipe pipe = to_intel_crtc(crtc)->pipe;
191 /* Transition from PSR_state 0 to PSR_state 1, i.e. PSR Inactive */
192 I915_WRITE(VLV_PSRCTL(pipe),
193 VLV_EDP_PSR_MODE_SW_TIMER |
194 VLV_EDP_PSR_SRC_TRANSMITTER_STATE |
198 static void vlv_psr_activate(struct intel_dp *intel_dp)
200 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
201 struct drm_device *dev = dig_port->base.base.dev;
202 struct drm_i915_private *dev_priv = dev->dev_private;
203 struct drm_crtc *crtc = dig_port->base.base.crtc;
204 enum pipe pipe = to_intel_crtc(crtc)->pipe;
206 /* Let's do the transition from PSR_state 1 to PSR_state 2
207 * that is PSR transition to active - static frame transmission.
208 * Then Hardware is responsible for the transition to PSR_state 3
209 * that is PSR active - no Remote Frame Buffer (RFB) update.
211 I915_WRITE(VLV_PSRCTL(pipe), I915_READ(VLV_PSRCTL(pipe)) |
212 VLV_EDP_PSR_ACTIVE_ENTRY);
215 static void hsw_psr_enable_source(struct intel_dp *intel_dp)
217 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
218 struct drm_device *dev = dig_port->base.base.dev;
219 struct drm_i915_private *dev_priv = dev->dev_private;
220 uint32_t max_sleep_time = 0x1f;
221 /* Lately it was identified that depending on panel idle frame count
222 * calculated at HW can be off by 1. So let's use what came
223 * from VBT + 1 and at minimum 2 to be on the safe side.
225 uint32_t idle_frames = dev_priv->vbt.psr.idle_frames ?
226 dev_priv->vbt.psr.idle_frames + 1 : 2;
228 const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
229 bool only_standby = false;
231 if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
234 if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby) {
235 val |= EDP_PSR_LINK_STANDBY;
236 val |= EDP_PSR_TP2_TP3_TIME_0us;
237 val |= EDP_PSR_TP1_TIME_0us;
238 val |= EDP_PSR_SKIP_AUX_EXIT;
240 val |= EDP_PSR_LINK_DISABLE;
242 I915_WRITE(EDP_PSR_CTL(dev), val |
243 (IS_BROADWELL(dev) ? 0 : link_entry_time) |
244 max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
245 idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
249 static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
251 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
252 struct drm_device *dev = dig_port->base.base.dev;
253 struct drm_i915_private *dev_priv = dev->dev_private;
254 struct drm_crtc *crtc = dig_port->base.base.crtc;
255 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
257 lockdep_assert_held(&dev_priv->psr.lock);
258 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
259 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
261 dev_priv->psr.source_ok = false;
263 if (IS_HASWELL(dev) && dig_port->port != PORT_A) {
264 DRM_DEBUG_KMS("HSW ties PSR to DDI A (eDP)\n");
268 if (!i915.enable_psr) {
269 DRM_DEBUG_KMS("PSR disable by flag\n");
273 if (IS_HASWELL(dev) &&
274 I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config.cpu_transcoder)) &
276 DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
280 if (IS_HASWELL(dev) &&
281 intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
282 DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
286 dev_priv->psr.source_ok = true;
290 static void intel_psr_activate(struct intel_dp *intel_dp)
292 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
293 struct drm_device *dev = intel_dig_port->base.base.dev;
294 struct drm_i915_private *dev_priv = dev->dev_private;
296 WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
297 WARN_ON(dev_priv->psr.active);
298 lockdep_assert_held(&dev_priv->psr.lock);
300 /* Enable/Re-enable PSR on the host */
302 /* On HSW+ after we enable PSR on source it will activate it
303 * as soon as it match configure idle_frame count. So
304 * we just actually enable it here on activation time.
306 hsw_psr_enable_source(intel_dp);
308 vlv_psr_activate(intel_dp);
310 dev_priv->psr.active = true;
314 * intel_psr_enable - Enable PSR
315 * @intel_dp: Intel DP
317 * This function can only be called after the pipe is fully trained and enabled.
319 void intel_psr_enable(struct intel_dp *intel_dp)
321 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
322 struct drm_device *dev = intel_dig_port->base.base.dev;
323 struct drm_i915_private *dev_priv = dev->dev_private;
326 DRM_DEBUG_KMS("PSR not supported on this platform\n");
330 if (!is_edp_psr(intel_dp)) {
331 DRM_DEBUG_KMS("PSR not supported by this panel\n");
335 mutex_lock(&dev_priv->psr.lock);
336 if (dev_priv->psr.enabled) {
337 DRM_DEBUG_KMS("PSR already in use\n");
341 if (!intel_psr_match_conditions(intel_dp))
344 dev_priv->psr.busy_frontbuffer_bits = 0;
347 hsw_psr_setup_vsc(intel_dp);
349 /* Avoid continuous PSR exit by masking memup and hpd */
350 I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
351 EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
353 /* Enable PSR on the panel */
354 hsw_psr_enable_sink(intel_dp);
356 vlv_psr_setup_vsc(intel_dp);
358 /* Enable PSR on the panel */
359 vlv_psr_enable_sink(intel_dp);
361 /* On HSW+ enable_source also means go to PSR entry/active
362 * state as soon as idle_frame achieved and here would be
363 * to soon. However on VLV enable_source just enable PSR
364 * but let it on inactive state. So we might do this prior
365 * to active transition, i.e. here.
367 vlv_psr_enable_source(intel_dp);
370 dev_priv->psr.enabled = intel_dp;
372 mutex_unlock(&dev_priv->psr.lock);
375 static void vlv_psr_disable(struct intel_dp *intel_dp)
377 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
378 struct drm_device *dev = intel_dig_port->base.base.dev;
379 struct drm_i915_private *dev_priv = dev->dev_private;
380 struct intel_crtc *intel_crtc =
381 to_intel_crtc(intel_dig_port->base.base.crtc);
384 if (dev_priv->psr.active) {
385 /* Put VLV PSR back to PSR_state 0 that is PSR Disabled. */
386 if (wait_for((I915_READ(VLV_PSRSTAT(intel_crtc->pipe)) &
387 VLV_EDP_PSR_IN_TRANS) == 0, 1))
388 WARN(1, "PSR transition took longer than expected\n");
390 val = I915_READ(VLV_PSRCTL(intel_crtc->pipe));
391 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
392 val &= ~VLV_EDP_PSR_ENABLE;
393 val &= ~VLV_EDP_PSR_MODE_MASK;
394 I915_WRITE(VLV_PSRCTL(intel_crtc->pipe), val);
396 dev_priv->psr.active = false;
398 WARN_ON(vlv_is_psr_active_on_pipe(dev, intel_crtc->pipe));
402 static void hsw_psr_disable(struct intel_dp *intel_dp)
404 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
405 struct drm_device *dev = intel_dig_port->base.base.dev;
406 struct drm_i915_private *dev_priv = dev->dev_private;
408 if (dev_priv->psr.active) {
409 I915_WRITE(EDP_PSR_CTL(dev),
410 I915_READ(EDP_PSR_CTL(dev)) & ~EDP_PSR_ENABLE);
412 /* Wait till PSR is idle */
413 if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev)) &
414 EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
415 DRM_ERROR("Timed out waiting for PSR Idle State\n");
417 dev_priv->psr.active = false;
419 WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
424 * intel_psr_disable - Disable PSR
425 * @intel_dp: Intel DP
427 * This function needs to be called before disabling pipe.
429 void intel_psr_disable(struct intel_dp *intel_dp)
431 struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
432 struct drm_device *dev = intel_dig_port->base.base.dev;
433 struct drm_i915_private *dev_priv = dev->dev_private;
435 mutex_lock(&dev_priv->psr.lock);
436 if (!dev_priv->psr.enabled) {
437 mutex_unlock(&dev_priv->psr.lock);
442 hsw_psr_disable(intel_dp);
444 vlv_psr_disable(intel_dp);
446 dev_priv->psr.enabled = NULL;
447 mutex_unlock(&dev_priv->psr.lock);
449 cancel_delayed_work_sync(&dev_priv->psr.work);
452 static void intel_psr_work(struct work_struct *work)
454 struct drm_i915_private *dev_priv =
455 container_of(work, typeof(*dev_priv), psr.work.work);
456 struct intel_dp *intel_dp = dev_priv->psr.enabled;
457 struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
458 enum pipe pipe = to_intel_crtc(crtc)->pipe;
460 /* We have to make sure PSR is ready for re-enable
461 * otherwise it keeps disabled until next full enable/disable cycle.
462 * PSR might take some time to get fully disabled
463 * and be ready for re-enable.
465 if (HAS_DDI(dev_priv->dev)) {
466 if (wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev_priv->dev)) &
467 EDP_PSR_STATUS_STATE_MASK) == 0, 50)) {
468 DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
472 if (wait_for((I915_READ(VLV_PSRSTAT(pipe)) &
473 VLV_EDP_PSR_IN_TRANS) == 0, 1)) {
474 DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
478 mutex_lock(&dev_priv->psr.lock);
479 intel_dp = dev_priv->psr.enabled;
485 * The delayed work can race with an invalidate hence we need to
486 * recheck. Since psr_flush first clears this and then reschedules we
487 * won't ever miss a flush when bailing out here.
489 if (dev_priv->psr.busy_frontbuffer_bits)
492 intel_psr_activate(intel_dp);
494 mutex_unlock(&dev_priv->psr.lock);
497 static void intel_psr_exit(struct drm_device *dev)
499 struct drm_i915_private *dev_priv = dev->dev_private;
500 struct intel_dp *intel_dp = dev_priv->psr.enabled;
501 struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
502 enum pipe pipe = to_intel_crtc(crtc)->pipe;
505 if (!dev_priv->psr.active)
509 val = I915_READ(EDP_PSR_CTL(dev));
511 WARN_ON(!(val & EDP_PSR_ENABLE));
513 I915_WRITE(EDP_PSR_CTL(dev), val & ~EDP_PSR_ENABLE);
515 dev_priv->psr.active = false;
517 val = I915_READ(VLV_PSRCTL(pipe));
519 /* Here we do the transition from PSR_state 3 to PSR_state 5
520 * directly once PSR State 4 that is active with single frame
521 * update can be skipped. PSR_state 5 that is PSR exit then
522 * Hardware is responsible to transition back to PSR_state 1
523 * that is PSR inactive. Same state after
524 * vlv_edp_psr_enable_source.
526 val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
527 I915_WRITE(VLV_PSRCTL(pipe), val);
529 /* Send AUX wake up - Spec says after transitioning to PSR
530 * active we have to send AUX wake up by writing 01h in DPCD
531 * 600h of sink device.
532 * XXX: This might slow down the transition, but without this
533 * HW doesn't complete the transition to PSR_state 1 and we
534 * never get the screen updated.
536 drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
540 dev_priv->psr.active = false;
544 * intel_psr_invalidate - Invalidade PSR
546 * @frontbuffer_bits: frontbuffer plane tracking bits
548 * Since the hardware frontbuffer tracking has gaps we need to integrate
549 * with the software frontbuffer tracking. This function gets called every
550 * time frontbuffer rendering starts and a buffer gets dirtied. PSR must be
551 * disabled if the frontbuffer mask contains a buffer relevant to PSR.
553 * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits."
555 void intel_psr_invalidate(struct drm_device *dev,
556 unsigned frontbuffer_bits)
558 struct drm_i915_private *dev_priv = dev->dev_private;
559 struct drm_crtc *crtc;
562 mutex_lock(&dev_priv->psr.lock);
563 if (!dev_priv->psr.enabled) {
564 mutex_unlock(&dev_priv->psr.lock);
568 crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
569 pipe = to_intel_crtc(crtc)->pipe;
573 frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
575 dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
576 mutex_unlock(&dev_priv->psr.lock);
580 * intel_psr_flush - Flush PSR
582 * @frontbuffer_bits: frontbuffer plane tracking bits
584 * Since the hardware frontbuffer tracking has gaps we need to integrate
585 * with the software frontbuffer tracking. This function gets called every
586 * time frontbuffer rendering has completed and flushed out to memory. PSR
587 * can be enabled again if no other frontbuffer relevant to PSR is dirty.
589 * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits.
591 void intel_psr_flush(struct drm_device *dev,
592 unsigned frontbuffer_bits)
594 struct drm_i915_private *dev_priv = dev->dev_private;
595 struct drm_crtc *crtc;
598 mutex_lock(&dev_priv->psr.lock);
599 if (!dev_priv->psr.enabled) {
600 mutex_unlock(&dev_priv->psr.lock);
604 crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
605 pipe = to_intel_crtc(crtc)->pipe;
606 dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
609 * On Haswell sprite plane updates don't result in a psr invalidating
610 * signal in the hardware. Which means we need to manually fake this in
611 * software for all flushes, not just when we've seen a preceding
612 * invalidation through frontbuffer rendering.
614 if (IS_HASWELL(dev) &&
615 (frontbuffer_bits & INTEL_FRONTBUFFER_SPRITE(pipe)))
619 * On Valleyview and Cherryview we don't use hardware tracking so
620 * any plane updates or cursor moves don't result in a PSR
621 * invalidating. Which means we need to manually fake this in
622 * software for all flushes, not just when we've seen a preceding
623 * invalidation through frontbuffer rendering. */
627 if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
628 schedule_delayed_work(&dev_priv->psr.work,
629 msecs_to_jiffies(100));
630 mutex_unlock(&dev_priv->psr.lock);
634 * intel_psr_init - Init basic PSR work and mutex.
637 * This function is called only once at driver load to initialize basic
640 void intel_psr_init(struct drm_device *dev)
642 struct drm_i915_private *dev_priv = dev->dev_private;
644 INIT_DELAYED_WORK(&dev_priv->psr.work, intel_psr_work);
645 mutex_init(&dev_priv->psr.lock);