From 38259bacd727a2a9e0c767bc6bc50ebb61501023 Mon Sep 17 00:00:00 2001 From: Martin Tsai Date: Thu, 26 Dec 2019 16:19:47 +0800 Subject: [PATCH] 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 Reviewed-by: Tony Cheng Acked-by: Harry Wentland Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- 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 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); } }