From: "Jerry (Fangzhi) Zuo" <Jerry.Zuo@amd.com>
Date: Tue, 31 Jul 2018 15:15:38 -0400
Subject: drm/amd/display: Fix warning observed in mode change on Vega
Git-commit: 7cb5285507172fabe87f87ef3d2cfe148e8a918d
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
[Why]
DOUBLE_BUFFER_EN bit is getting cleared before enable blanking.
That leads to CRTC_BLANK_DATA_EN is getting updated immediately.
[How]
Get DOUBLE_BUFFER_EN bit set, the same as DCE110.
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c
@@ -772,7 +772,7 @@ void dce120_tg_set_blank(struct timing_g
CRTC_REG_SET(
CRTC0_CRTC_DOUBLE_BUFFER_CONTROL,
- CRTC_BLANK_DATA_DOUBLE_BUFFER_EN, 0);
+ CRTC_BLANK_DATA_DOUBLE_BUFFER_EN, 1);
if (enable_blanking)
CRTC_REG_SET(CRTC0_CRTC_BLANK_CONTROL, CRTC_BLANK_DATA_EN, 1);