linux-kernel - [PATCH 1/2] drm/bridge: ps8640: Skip redundant bridge enable

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Date:   Tue, 14 Mar 2023 19:00:42 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Pin-yen Lin <treapking@...omium.org>
Subject: [PATCH 1/2] drm/bridge: ps8640: Skip redundant bridge enable

Skip the drm_bridge_chain_pre_enable call when the bridge is already
pre_enabled. This make pre_enable and post_disable (thus
pm_runtime_get/put) symmetric.

Fixes: 46f206304db0 ("drm/bridge: ps8640: Rework power state handling")
Signed-off-by: Pin-yen Lin <treapking@...omium.org>
---

 drivers/gpu/drm/bridge/parade-ps8640.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 4b361d7d5e44..08de501c436e 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -557,7 +557,8 @@ static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge,
 	 * EDID, for this chip, we need to do a full poweron, otherwise it will
 	 * fail.
 	 */
-	drm_atomic_bridge_chain_pre_enable(bridge, connector->state->state);
+	if (poweroff)
+		drm_atomic_bridge_chain_pre_enable(bridge, connector->state->state);
 
 	edid = drm_get_edid(connector,
 			    ps_bridge->page[PAGE0_DP_CNTL]->adapter);
-- 
2.40.0.rc1.284.g88254d51c5-goog