linux-kernel - [PATCH v9 08/15] drm/bridge: add psr support for panel bridge callbacks

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Date:   Wed, 14 Dec 2022 15:35:45 +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:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        <linux-kernel@...r.kernel.org>, <robdclark@...il.com>,
        <dianders@...omium.org>, <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>, <quic_sbillaka@...cinc.com>
Subject: [PATCH v9 08/15] drm/bridge: add psr support for panel bridge callbacks

This change will handle the psr entry exit cases in the panel
bridge atomic callback functions. For example, the panel power
should not turn off if the panel is entering psr.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
---
 drivers/gpu/drm/bridge/panel.c | 48 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 3558cbf..5e77e38 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -113,6 +113,18 @@ static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_state;
+
+	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+	if (old_crtc_state && old_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_prepare(panel_bridge->panel);
 }
@@ -121,6 +133,18 @@ static void panel_bridge_atomic_enable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_state;
+
+	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+	if (old_crtc_state && old_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_enable(panel_bridge->panel);
 }
@@ -129,6 +153,18 @@ static void panel_bridge_atomic_disable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (new_crtc_state && new_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_disable(panel_bridge->panel);
 }
@@ -137,6 +173,18 @@ static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (new_crtc_state && new_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_unprepare(panel_bridge->panel);
 }
-- 
2.7.4