linux-kernel - [PATCH v9 06/15] drm/msm/dp: disable self_refresh

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Date:   Wed, 14 Dec 2022 15:35:43 +0530
From:   Vinod Polimera <quic_vpolimer@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>
CC:     Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        <linux-kernel@...r.kernel.org>, <robdclark@...il.com>,
        <dianders@...omium.org>, <quic_vpolimer@...cinc.com>,
        <swboyd@...omium.org>, <quic_kalyant@...cinc.com>,
        <dmitry.baryshkov@...aro.org>, <quic_khsieh@...cinc.com>,
        <quic_vproddut@...cinc.com>, <quic_bjorande@...cinc.com>,
        <quic_aravindh@...cinc.com>, <quic_abhinavk@...cinc.com>
Subject: [PATCH v9 06/15] drm/msm/dp: disable self_refresh_aware after entering psr

From: Sankeerth Billakanti <quic_sbillaka@...cinc.com>

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.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
---
 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 d3e9010..0f262a6 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -131,6 +131,8 @@ 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
@@ -147,10 +149,22 @@ 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;
+	}
+
 }
 
 static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
@@ -161,6 +175,14 @@ 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);
@@ -187,6 +209,9 @@ 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) {
-- 
2.7.4