Commit 37b7cb10 authored Sep 09, 2020 by Wesley Chalmers Committed by Alex Deucher Sep 22, 2020

drm/amd/display: Increase timeout for DP Disable



[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>

parent 25b31581

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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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