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    Subject[PATCH 6.0 766/862] drm/amd/display: polling vid stream status in hpo dp blank
    Date
    From: Wenjing Liu <wenjing.liu@amd.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@amd.com>
    Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
    Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
    Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.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


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