linux-kernel - [PATCH AUTOSEL 5.8 38/42] drm/amd/display: Keep current gain when ABM disable immediately

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Message-Id: <20200831152934.1023912-38-sashal@kernel.org>
Date:   Mon, 31 Aug 2020 11:29:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Brandon Syu <Brandon.Syu@....com>,
        Josip Pavic <Josip.Pavic@....com>,
        Eryk Brol <eryk.brol@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.8 38/42] drm/amd/display: Keep current gain when ABM disable immediately

From: Brandon Syu <Brandon.Syu@....com>

[ Upstream commit cba4b52e431e5de3d8012281cfe194f1c39a9052 ]

[Why]
When system enters s3/s0i3, backlight PWM would set user level.

[How]
ABM disable function add keep current gain to avoid it.

Signed-off-by: Brandon Syu <Brandon.Syu@....com>
Reviewed-by: Josip Pavic <Josip.Pavic@....com>
Acked-by: Eryk Brol <eryk.brol@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dc_stream.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 49aad691e687e..ccac2315a903a 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -222,7 +222,7 @@ struct dc_stream_state {
 	union stream_update_flags update_flags;
 };
 
-#define ABM_LEVEL_IMMEDIATE_DISABLE 0xFFFFFFFF
+#define ABM_LEVEL_IMMEDIATE_DISABLE 255
 
 struct dc_stream_update {
 	struct dc_stream_state *stream;
-- 
2.25.1