| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.9 318/391] drm/amd/display: Increase timeout for DP Disable | Date | Tue, 3 Nov 2020 21:36:09 +0100 |
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From: Wesley Chalmers <Wesley.Chalmers@amd.com>
commit 37b7cb10f07c1174522faafc1d51c6591b1501d4 upstream.
[WHY] When disabling DP video, the current REG_WAIT timeout of 50ms is too low for certain cases with very high VSYNC intervals.
[HOW] Increase the timeout to 102ms, so that refresh rates as low as 10Hz can be handled properly.
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c @@ -896,10 +896,10 @@ void enc1_stream_encoder_dp_blank( */ REG_UPDATE(DP_VID_STREAM_CNTL, DP_VID_STREAM_DIS_DEFER, 2); /* Larger delay to wait until VBLANK - use max retry of - * 10us*5000=50ms. This covers 41.7ms of minimum 24 Hz mode + + * 10us*10200=102ms. This covers 100.0ms of minimum 10 Hz mode + * a little more because we may not trust delay accuracy. */ - max_retries = DP_BLANK_MAX_RETRY * 250; + max_retries = DP_BLANK_MAX_RETRY * 501; /* disable DP stream */ REG_UPDATE(DP_VID_STREAM_CNTL, DP_VID_STREAM_ENABLE, 0);
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