linux-kernel - [PATCH 6.0 766/862] drm/amd/display: polling vid stream status in hpo dp blank

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Message-Id: <20221019083323.765197093@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:34:13 +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, Ariel Bernstein <Eric.Bernstein@....com>,
        Jasdeep Dhillon <jdhillon@....com>,
        Wenjing Liu <wenjing.liu@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 766/862] drm/amd/display: polling vid stream status in hpo dp blank

From: Wenjing Liu <wenjing.liu@....com>

[ Upstream commit e32df0c7ecead95d70ca89f39b1b2b02a59ff691 ]

[why]
vid stream control is double bufferred, if we don't wait for video
stream enable set to 0, we may get temporary image corruption
showing on the stream when setting PIXEL_TO_SYMBOL_FIFO_ENABLE to 0.

Reviewed-by: Ariel Bernstein <Eric.Bernstein@....com>
Acked-by: Jasdeep Dhillon <jdhillon@....com>
Signed-off-by: Wenjing Liu <wenjing.liu@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c  | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c
index 23621ff08c90..52fb2bf3d578 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c
@@ -150,9 +150,9 @@ static void dcn31_hpo_dp_stream_enc_dp_blank(
 	 * 10us*5000=50ms. This covers 41.7ms of minimum 24 Hz mode +
 	 * a little more because we may not trust delay accuracy.
 	 */
-	//REG_WAIT(DP_SYM32_ENC_VID_STREAM_CONTROL,
-	//		VID_STREAM_STATUS, 0,
-	//		10, 5000);
+	REG_WAIT(DP_SYM32_ENC_VID_STREAM_CONTROL,
+			VID_STREAM_STATUS, 0,
+			10, 5000);
 
 	/* Disable SDP tranmission */
 	REG_UPDATE(DP_SYM32_ENC_SDP_CONTROL,
-- 
2.35.1