Re: [PATCH Resend v11 05/15] drm/msm/dp: disable self_refresh_aware after entering psr

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On 19/01/2023 16:26, Vinod Polimera wrote:
From: Sankeerth Billakanti <quic_sbillaka@xxxxxxxxxxx>

Updated frames get queued if self_refresh_aware is set when the
sink is in psr. To support bridge enable and avoid queuing of update
frames, reset the self_refresh_aware state after entering psr.

I'm not convinced by this change. E.g. analogix code doesn't do this. Could you please clarify, why do you need to toggle the self_refresh_aware flag?


Signed-off-by: Sankeerth Billakanti <quic_sbillaka@xxxxxxxxxxx>
Signed-off-by: Vinod Polimera <quic_vpolimer@xxxxxxxxxxx>
---
  drivers/gpu/drm/msm/dp/dp_drm.c | 27 ++++++++++++++++++++++++++-
  1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 029e08c..92d1a1b 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -134,6 +134,8 @@ static void edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
  	struct drm_crtc_state *old_crtc_state;
  	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
  	struct msm_dp *dp = dp_bridge->dp_display;
+	struct drm_connector *connector;
+	struct drm_connector_state *conn_state = NULL;
/*
  	 * Check the old state of the crtc to determine if the panel
@@ -150,10 +152,22 @@ static void edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
if (old_crtc_state && old_crtc_state->self_refresh_active) {
  		dp_display_set_psr(dp, false);
-		return;
+		goto psr_aware;
  	}
dp_bridge_atomic_enable(drm_bridge, old_bridge_state);
+
+psr_aware:
+	connector = drm_atomic_get_new_connector_for_encoder(atomic_state,
+							drm_bridge->encoder);
+	if (connector)
+		conn_state = drm_atomic_get_new_connector_state(atomic_state,
+								connector);
+
+	if (conn_state) {
+		conn_state->self_refresh_aware = dp->psr_supported;
+	}

No need to wrap a single line statement in brackets.

+
  }
static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
@@ -164,6 +178,14 @@ static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
  	struct drm_crtc_state *new_crtc_state = NULL, *old_crtc_state = NULL;
  	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
  	struct msm_dp *dp = dp_bridge->dp_display;
+	struct drm_connector *connector;
+	struct drm_connector_state *conn_state = NULL;
+
+	connector = drm_atomic_get_old_connector_for_encoder(atomic_state,
+							drm_bridge->encoder);
+	if (connector)
+		conn_state = drm_atomic_get_new_connector_state(atomic_state,
+								connector);
crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state,
  						   drm_bridge->encoder);
@@ -190,6 +212,9 @@ static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
  	 * when display disable occurs while the sink is in psr state.
  	 */
  	if (new_crtc_state->self_refresh_active) {
+		if (conn_state)
+			conn_state->self_refresh_aware = false;
+
  		dp_display_set_psr(dp, true);
  		return;
  	} else if (old_crtc_state->self_refresh_active) {

--
With best wishes
Dmitry




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