From: Martin Tsai <martin.tsai@amd.com>
Date: Thu, 26 Dec 2019 08:19:47 +0000 (+0800)
Subject: drm/amd/display: Use mdelay to avoid context switch
X-Git-Tag: v5.6-rc1~114^2~6^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=38259bacd727a2a9e0c767bc6bc50ebb61501023;p=thirdparty%2Flinux.git

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>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 89920924a1546..f07899e270f59 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -1642,9 +1642,9 @@ void dcn20_program_front_end_for_ctx(
 			struct hubp *hubp = pipe->plane_res.hubp;
 			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++)
-				msleep(1);
+				mdelay(1);
 		}
 	}