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drm/amd/display: Increase timeout for DP Disable 

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>
This commit is contained in:
Wesley Chalmers 2020-09-09 17:41:53 -04:00 committed by Greg Kroah-Hartman
parent 987d3814c9
commit 9887a48d49
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c
View File

@ -898,10 +898,10 @@ 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);