eDP spec states that sink device will do a short pulse in HPD
line when there is a PSR/PSR2 error that needs to be handled by
source, this is handling the first and most simples error:
DP_PSR_SINK_INTERNAL_ERROR.
Here taking the safest approach and disabling PSR(at least until
the next modeset), to avoid multiple rendering issues due to
bad pannels.
v3:
disabling PSR instead of exiting on error
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 2 ++
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/i915/intel_psr.c | 62 +++++++++++++++++++++++++-------
3 files changed, 52 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b86da48fd38e..fa2851d4fb36 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4479,6 +4479,8 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
if (intel_dp_needs_link_retrain(intel_dp))
return false;
+ intel_psr_short_pulse(intel_dp);
+
if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) {
DRM_DEBUG_KMS("Link Training Compliance Test requested\n");
/* Send a Hotplug Uevent to userspace to start modeset */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4508be628450..892da65358e9 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1921,6 +1921,7 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state);
void intel_psr_irq_control(struct drm_i915_private *dev_priv, bool debug);
void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir);
+void intel_psr_short_pulse(struct intel_dp *intel_dp);
/* intel_runtime_pm.c */
int intel_power_domains_init(struct drm_i915_private *);
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index d88799482875..60797c8f9f0e 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -741,6 +741,23 @@ static void hsw_psr_disable(struct intel_dp *intel_dp)
psr_aux_io_power_put(intel_dp);
}
+static void psr_disable(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+
+ if (!dev_priv->psr.enabled)
+ return;
+
+ dev_priv->psr.disable_source(intel_dp);
+
+ /* Disable PSR on Sink */
+ drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
+ dev_priv->psr.enabled = NULL;
+ cancel_delayed_work_sync(&dev_priv->psr.work);
+}
+
/**
* intel_psr_disable - Disable PSR
* @intel_dp: Intel DP
@@ -762,20 +779,8 @@ void intel_psr_disable(struct intel_dp *intel_dp,
return;
mutex_lock(&dev_priv->psr.lock);
- if (!dev_priv->psr.enabled) {
- mutex_unlock(&dev_priv->psr.lock);
- return;
- }
-
- dev_priv->psr.disable_source(intel_dp);
-
- /* Disable PSR on Sink */
- drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
-
- dev_priv->psr.enabled = NULL;
+ psr_disable(intel_dp);
mutex_unlock(&dev_priv->psr.lock);
-
- cancel_delayed_work_sync(&dev_priv->psr.work);
}
static bool psr_wait_for_idle(struct drm_i915_private *dev_priv)
@@ -1014,3 +1019,34 @@ void intel_psr_init(struct drm_i915_private *dev_priv)
dev_priv->psr.setup_vsc = hsw_psr_setup_vsc;
}
+
+void intel_psr_short_pulse(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ struct i915_psr *psr = &dev_priv->psr;
+ uint8_t val;
+
+ if (!HAS_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
+ return;
+
+ mutex_lock(&psr->lock);
+
+ if (psr->enabled != intel_dp)
+ goto exit;
+
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val) != 1) {
+ DRM_ERROR("PSR_STATUS dpcd read failed\n");
+ goto exit;
+ }
+
+ if ((val & DP_PSR_SINK_STATE_MASK) == DP_PSR_SINK_INTERNAL_ERROR) {
+ DRM_DEBUG_KMS("PSR sink internal error, disabling PSR\n");
+ psr_disable(intel_dp);
+ }
+
+ /* TODO: handle other PSR/PSR2 errors */
+exit:
+ mutex_unlock(&psr->lock);
+}
--
2.17.0
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