[PATCH] drm/radeon: A gray screen appears when going into hibernation(S4)

wangjingyu wangjingyu at uniontech.com
Mon Feb 22 06:46:53 UTC 2021

Radeon Card:
    Caicos[Radeon HD 6450/7450/8450 /R5 230 OEM]

there is no gray screen when echo 4>/sys/module/drm/parameters/debug,
so the WREG32 function after DRM_DEBUG_KMS may have wrong when going
into hibernation.the delay of msleep(50) just can fix gray screen.

Signed-off-by: wangjingyu <wangjingyu at uniontech.com>
Signed-off-by: zhuyong <zhuyong at uniontech.com>
 drivers/gpu/drm/radeon/radeon_display.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index ddfe91efa61e..1f7f0904e4a5 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -215,6 +215,7 @@ void radeon_crtc_load_lut(struct drm_crtc *crtc)
 	if (!crtc->enabled)
+	msleep(50);
 	if (ASIC_IS_DCE5(rdev))
 	else if (ASIC_IS_DCE4(rdev))

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