Commit 38259bac authored Dec 26, 2019 by Martin Tsai Committed by Alex Deucher Jan 16, 2020

drm/amd/display: Use mdelay to avoid context switch



[why]
The rapid msleep operation causes the white line garbage when
DAL check flip pending status in SetVidPnSourceVisibility.
To execute this msleep will induce context switch, and longer
delay could cause worse garbage situation.

[how]
To replace msleep with mdelay.

Signed-off-by: Martin Tsai <martin.tsai@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent bae9c49b

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

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1642,9 +1642,9 @@ void dcn20_program_front_end_for_ctx(
	struct hubp *hubp = pipe->plane_res.hubp;		struct hubp *hubp = pipe->plane_res.hubp;
	int j = 0;		int j = 0;

	for (j = 0; j < TIMEOUT_FOR_PIPE_ENABLE_MS		for (j = 0; j < TIMEOUT_FOR_PIPE_ENABLE_MS*1000
	&& hubp->funcs->hubp_is_flip_pending(hubp); j++)		&& hubp->funcs->hubp_is_flip_pending(hubp); j++)
	msleep(1);		mdelay(1);
	}		}
	}		}

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