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.
v5:
added lockdep_assert in psr_disable and renamed psr_disable()
to intel_psr_disable_locked()
v4:
Using CAN_PSR instead of HAS_PSR in intel_psr_short_pulse
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, 54 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6ac6c8787dcf..7c5b6ec5d7ba 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4499,6 +4499,8 @@ 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 04d61897b044..6bcf8e910015 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1927,6 +1927,7 @@ 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 bc6d54f677dc..768931fa634d 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -720,6 +720,25 @@ static void hsw_psr_disable(struct intel_dp *intel_dp)
psr_aux_io_power_put(intel_dp);
}
+static void intel_psr_disable_locked(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);
+
+ lockdep_assert_held(&dev_priv->psr.lock);
+
+ 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;
+}
+
/**
* intel_psr_disable - Disable PSR
* @intel_dp: Intel DP
@@ -741,17 +760,7 @@ 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;
+ intel_psr_disable_locked(intel_dp);
mutex_unlock(&dev_priv->psr.lock);
}
@@ -992,3 +1001,34 @@ 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;
+ u8 val;
+
+ if (!CAN_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");
+ intel_psr_disable_locked(intel_dp);
+ }
+
+ /* TODO: handle other PSR/PSR2 errors */
+exit:
+ mutex_unlock(&psr->lock);
+}
--
2.17.1
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