[Intel-gfx] [PATCH] drm/i915/display: Exit PSR when doing async flips

[José Roberto de Souza]

Changing the buffer in the middle of the scanout then entering an
period of flip idleness will cause part of the previous buffer being
diplayed to user when PSR is enabled.

So here disabling and scheduling activation after a few milliseconds
when async flip is enabled in the state.

The async flip check that we had in PSR compute is not executed at
every flip so it was not doing anything useful and is also being
dropped here.

Cc: Karthik B S <karthik.b.s at intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 9d589d471e335..d1301e2729553 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -731,12 +731,6 @@ static bool intel_psr2_sel_fetch_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
-	if (crtc_state->uapi.async_flip) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "PSR2 sel fetch not enabled, async flip enabled\n");
-		return false;
-	}
-
 	/* Wa_14010254185 Wa_14010103792 */
 	if (IS_TGL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_C0)) {
 		drm_dbg_kms(&dev_priv->drm,
@@ -1780,6 +1774,11 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state,
 		if (psr->enabled && needs_to_disable)
 			intel_psr_disable_locked(intel_dp);
 
+		if (psr->enabled && crtc_state->uapi.async_flip) {
+			intel_psr_exit(intel_dp);
+			schedule_work(&intel_dp->psr.work);
+		}
+
 		mutex_unlock(&psr->lock);
 	}
 }
-- 
2.33.1