[Intel-gfx] [PATCH v5 5/6] drm/i915: Keep PSR disabled after a driver reload after a PSR error

[José Roberto de Souza]

If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
will still keep the error set even after the reset done in the
irq_preinstall and irq_uninstall hooks.
And enabling in this situation cause the screen to freeze in the
first time that PSR HW tries to activate so lets keep PSR disabled
to avoid any rendering problems.

v5: rebased: using edp_psr_shift()

v4: Moved handling from intel_psr_compute_config() to
intel_psr_init() to avoid hardware access during compute(Ville)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>

squash
---
 drivers/gpu/drm/i915/intel_psr.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index f0bfe0a5ff7c..c5ab69e6c90b 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -1111,6 +1111,8 @@ void intel_psr_flush(struct drm_i915_private *dev_priv,
  */
 void intel_psr_init(struct drm_i915_private *dev_priv)
 {
+	u32 val;
+
 	if (!HAS_PSR(dev_priv))
 		return;
 
@@ -1124,6 +1126,22 @@ void intel_psr_init(struct drm_i915_private *dev_priv)
 		if (INTEL_GEN(dev_priv) < 9 || !dev_priv->vbt.psr.enable)
 			i915_modparams.enable_psr = 0;
 
+	/*
+	 * If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
+	 * will still keep the error set even after the reset done in the
+	 * irq_preinstall and irq_uninstall hooks.
+	 * And enabling in this situation cause the screen to freeze in the
+	 * first time that PSR HW tries to activate so lets keep PSR disabled
+	 * to avoid any rendering problems.
+	 */
+	val = I915_READ(EDP_PSR_IIR);
+	val &= EDP_PSR_ERROR(edp_psr_shift(TRANSCODER_EDP));
+	if (val) {
+		DRM_DEBUG_KMS("PSR interruption error set\n");
+		dev_priv->psr.sink_not_reliable = true;
+		return;
+	}
+
 	/* Set link_standby x link_off defaults */
 	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 		/* HSW and BDW require workarounds that we don't implement. */
-- 
2.19.1