linux-kernel - [PATCH 5.19 319/717] drm/bridge: it6505: Fix the order of DP_SET

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Date:   Sat, 22 Oct 2022 09:23:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pin-yen Lin <treapking@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 319/717] drm/bridge: it6505: Fix the order of DP_SET_POWER commands

From: Pin-yen Lin <treapking@...omium.org>

[ Upstream commit 7c1dceaffd99247bf443606730515b54d6285969 ]

Send DP_SET_POWER_D3 command to the downstream before stopping DP, so the
suspend process will not be interrupted by the HPD interrupt. Also modify
the order in .atomic_enable callback to make the callbacks symmetric.

Fixes: 46ca7da7f1e8 ("drm/bridge: it6505: Send DPCD SET_POWER to downstream")
Signed-off-by: Pin-yen Lin <treapking@...omium.org>
Reviewed-by: Robert Foss <robert.foss@...aro.org>
Signed-off-by: Robert Foss <robert.foss@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830045756.1655954-1-treapking@chromium.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index e5626035f311..a09d1a39ab0a 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2945,9 +2945,6 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (ret)
 		dev_err(dev, "Failed to setup AVI infoframe: %d", ret);
 
-	it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
-				     DP_SET_POWER_D0);
-
 	it6505_update_video_parameter(it6505, mode);
 
 	ret = it6505_send_video_infoframe(it6505, &frame);
@@ -2957,6 +2954,9 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
 
 	it6505_int_mask_enable(it6505);
 	it6505_video_reset(it6505);
+
+	it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
+				     DP_SET_POWER_D0);
 }
 
 static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
@@ -2968,9 +2968,9 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
 	DRM_DEV_DEBUG_DRIVER(dev, "start");
 
 	if (it6505->powered) {
-		it6505_video_disable(it6505);
 		it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
 					     DP_SET_POWER_D3);
+		it6505_video_disable(it6505);
 	}
 }
 
-- 
2.35.1