Commit 01f60348 authored by Wen Chen's avatar Wen Chen Committed by Alex Deucher
Browse files

drm/amd/display: Fix 'failed to blank crtc!' 



[why]
DCN35 is having “DC: failed to blank crtc!” when running HPO
test cases. It's caused by not having sufficient udelay time.

[how]
Replace the old wait_for_blank_complete function with fsleep function to
sleep just until the next frame should come up. This way it doesn't poll
in case the pixel clock or other clock was bugged or until vactive and
the vblank are hit again.

Reviewed-by: default avatarNicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: default avatarWen Chen <Wen.Chen3@amd.com>
Signed-off-by: default avatarFangzhi Zuo <jerry.zuo@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 592ddac9

drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c

+1 −1
Original line number Diff line number Diff line
@@ -956,7 +956,7 @@ enum dc_status dcn20_enable_stream_timing( 
		return DC_ERROR_UNEXPECTED;

	}



	hws->funcs.wait_for_blank_complete(pipe_ctx->stream_res.opp);

	fsleep(stream->timing.v_total * (stream->timing.h_total * 10000u / stream->timing.pix_clk_100hz));



	params.vertical_total_min = stream->adjust.v_total_min;

	params.vertical_total_max = stream->adjust.v_total_max;