[PATCH v3 1/4] drm/i915/psr: Do not trigger Frame Change events from frontbuffer flush

[Jouni Högander]

We want to get rid of triggering "Frame Change" events from
frontbuffer flush calls. We are about to move using TRANS_PUSH
register for this on LunarLake and onwards. Touching TRANS_PUSH
register from fronbuffer flush would be problematic as it's written by
DSB as well.

Fix this by using intel_psr_exit when flush or invalidate is done on
LunarLake and onwards. This is not possible on AlderLake and
MeteorLake due to HW bug in PSR2 disable.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index cd833b63ea6b..3d637d92ca89 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -3250,7 +3250,9 @@ static void intel_psr_configure_full_frame_update(struct intel_dp *intel_dp)
 
 static void _psr_invalidate_handle(struct intel_dp *intel_dp)
 {
-	if (intel_dp->psr.psr2_sel_fetch_enabled) {
+	struct intel_display *display = to_intel_display(intel_dp);
+
+	if (DISPLAY_VER(display) < 20 && intel_dp->psr.psr2_sel_fetch_enabled) {
 		if (!intel_dp->psr.psr2_sel_fetch_cff_enabled) {
 			intel_dp->psr.psr2_sel_fetch_cff_enabled = true;
 			intel_psr_configure_full_frame_update(intel_dp);
@@ -3338,7 +3340,7 @@ static void _psr_flush_handle(struct intel_dp *intel_dp)
 	struct intel_display *display = to_intel_display(intel_dp);
 	struct drm_i915_private *dev_priv = to_i915(display->drm);
 
-	if (intel_dp->psr.psr2_sel_fetch_enabled) {
+	if (DISPLAY_VER(display) < 20 && intel_dp->psr.psr2_sel_fetch_enabled) {
 		if (intel_dp->psr.psr2_sel_fetch_cff_enabled) {
 			/* can we turn CFF off? */
 			if (intel_dp->psr.busy_frontbuffer_bits == 0)
@@ -3355,11 +3357,13 @@ static void _psr_flush_handle(struct intel_dp *intel_dp)
 		 * existing SU configuration
 		 */
 		intel_psr_configure_full_frame_update(intel_dp);
-	}
 
-	intel_psr_force_update(intel_dp);
+		intel_psr_force_update(intel_dp);
+	} else {
+		intel_psr_exit(intel_dp);
+	}
 
-	if (!intel_dp->psr.psr2_sel_fetch_enabled && !intel_dp->psr.active &&
+	if ((!intel_dp->psr.psr2_sel_fetch_enabled || DISPLAY_VER(display) >= 20) &&
 	    !intel_dp->psr.busy_frontbuffer_bits)
 		queue_work(dev_priv->unordered_wq, &intel_dp->psr.work);
 }
-- 
2.43.0