[Intel-gfx] [PATCH] drm/i915: VLV/CHV PSR Software timer mode
Rodrigo Vivi
rodrigo.vivi at intel.com
Wed Nov 19 16:37:47 CET 2014
This patch introduces exit/activate functions for PSR
on VLV+. Since on VLV+ HW cannot track frame updates and force PSR
exit let's use fully SW tracking available.
v2: Rebase over intel_psr.c;
Remove Single Frame update transitioning from state 3 to 5 directly;
Fake a software invalidation for sprites and cursor so we don't miss
any screen update;
v3: As pointed out by Durgadoss msecs_to_jiffies used on wait_for only uses int,
so let's use 1 instead. Althought the 1/4 of this is needed for the
transition let's use 1 for simplicity;
Also fix comments as suggested by Durgadoss
Cc: Durgadoss R <durgadoss.r at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
drivers/gpu/drm/i915/intel_psr.c | 97 ++++++++++++++++++++++++++++++++++------
1 file changed, 84 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 30f341a..dd0e6e0 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -195,6 +195,23 @@ static void vlv_psr_enable_source(struct intel_dp *intel_dp)
VLV_EDP_PSR_ENABLE);
}
+static void vlv_psr_activate(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_crtc *crtc = dig_port->base.base.crtc;
+ enum pipe pipe = to_intel_crtc(crtc)->pipe;
+
+ /* Let's do the transition from PSR_state 1 to PSR_state 2
+ * that is PSR transition to active - static frame transmission.
+ * Then Hardware is responsible for the transition to PSR_state 3
+ * that is PSR active - no Remote Frame Buffer (RFB) update.
+ */
+ I915_WRITE(VLV_PSRCTL(pipe), I915_READ(VLV_PSRCTL(pipe)) |
+ VLV_EDP_PSR_ACTIVE_ENTRY);
+}
+
static void hsw_psr_enable_source(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
@@ -283,12 +300,16 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
WARN_ON(dev_priv->psr.active);
lockdep_assert_held(&dev_priv->psr.lock);
- /* Enable/Re-enable PSR on the host
- * On HSW+ after we enable PSR on source it will activate it
- * as soon as it match configure idle_frame count. So
- * we just actually enable it here on activation time.
- */
- hsw_psr_enable_source(intel_dp);
+ /* Enable/Re-enable PSR on the host */
+ if (HAS_DDI(dev))
+ /* On HSW+ after we enable PSR on source it will activate it
+ * as soon as it match configure idle_frame count. So
+ * we just actually enable it here on activation time.
+ */
+ hsw_psr_enable_source(intel_dp);
+ else
+ vlv_psr_activate(intel_dp);
+
dev_priv->psr.active = true;
}
@@ -436,18 +457,27 @@ static void intel_psr_work(struct work_struct *work)
struct drm_i915_private *dev_priv =
container_of(work, typeof(*dev_priv), psr.work.work);
struct intel_dp *intel_dp = dev_priv->psr.enabled;
+ struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
+ enum pipe pipe = to_intel_crtc(crtc)->pipe;
/* We have to make sure PSR is ready for re-enable
* otherwise it keeps disabled until next full enable/disable cycle.
* PSR might take some time to get fully disabled
* and be ready for re-enable.
*/
- if (wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev_priv->dev)) &
- EDP_PSR_STATUS_STATE_MASK) == 0, 50)) {
- DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
- return;
+ if (HAS_DDI(dev_priv->dev)) {
+ if (wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev_priv->dev)) &
+ EDP_PSR_STATUS_STATE_MASK) == 0, 50)) {
+ DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
+ return;
+ }
+ } else {
+ if (wait_for((I915_READ(VLV_PSRSTAT(pipe)) &
+ VLV_EDP_PSR_IN_TRANS) == 0, 1)) {
+ DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
+ return;
+ }
}
-
mutex_lock(&dev_priv->psr.lock);
intel_dp = dev_priv->psr.enabled;
@@ -470,17 +500,47 @@ unlock:
static void intel_psr_exit(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_dp *intel_dp = dev_priv->psr.enabled;
+ struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
+ enum pipe pipe = to_intel_crtc(crtc)->pipe;
+ u32 val;
- if (dev_priv->psr.active) {
- u32 val = I915_READ(EDP_PSR_CTL(dev));
+ if (!dev_priv->psr.active)
+ return;
+
+ if (HAS_DDI(dev)) {
+ val = I915_READ(EDP_PSR_CTL(dev));
WARN_ON(!(val & EDP_PSR_ENABLE));
I915_WRITE(EDP_PSR_CTL(dev), val & ~EDP_PSR_ENABLE);
dev_priv->psr.active = false;
+ } else {
+ val = I915_READ(VLV_PSRCTL(pipe));
+
+ /* Here we do the transition from PSR_state 3 to PSR_state 5
+ * directly once PSR State 4 that is active with single frame
+ * update can be skipped. PSR_state 5 that is PSR exit then
+ * Hardware is responsible to transition back to PSR_state 1
+ * that is PSR inactive. Same state after
+ * vlv_edp_psr_enable_source.
+ */
+ val &= ~VLV_EDP_PSR_ACTIVE_ENTRY;
+ I915_WRITE(VLV_PSRCTL(pipe), val);
+
+ /* Send AUX wake up - Spec says after transitioning to PSR
+ * active we have to send AUX wake up by writing 01h in DPCD
+ * 600h of sink device.
+ * XXX: This might slow down the transition, but without this
+ * HW doesn't complete the transition to PSR_state 1 and we
+ * never get the screen updated.
+ */
+ drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
+ DP_SET_POWER_D0);
}
+ dev_priv->psr.active = false;
}
/**
@@ -558,6 +618,17 @@ void intel_psr_flush(struct drm_device *dev,
(frontbuffer_bits & INTEL_FRONTBUFFER_SPRITE(pipe)))
intel_psr_exit(dev);
+ /*
+ * On Valleyview and Cherryview we don't use hardware tracking so
+ * sprite plane updates or cursor moves don't result in a PSR
+ * invalidating. Which means we need to manually fake this in
+ * software for all flushes, not just when we've seen a preceding
+ * invalidation through frontbuffer rendering. */
+ if (!HAS_DDI(dev) &&
+ ((frontbuffer_bits & INTEL_FRONTBUFFER_SPRITE(pipe)) ||
+ (frontbuffer_bits & INTEL_FRONTBUFFER_CURSOR(pipe))))
+ intel_psr_exit(dev);
+
if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
schedule_delayed_work(&dev_priv->psr.work,
msecs_to_jiffies(100));
--
1.9.3
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