From 527324b761d6005fa376ea624fddbd2fa93bd10e Mon Sep 17 00:00:00 2001
From: Martin Tsai <martin.tsai@amd.com>
Date: Thu, 26 Dec 2019 16:19:47 +0800
Subject: drm/amd/display: Use mdelay to avoid context switch
Git-commit: 38259bacd727a2a9e0c767bc6bc50ebb61501023
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
[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>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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 89920924a154..f07899e270f5 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);
}
}
--
2.28.0