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

[wangjingyu]

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 <wangjin...@uniontech.com>
Signed-off-by: zhuyong <zhuy...@uniontech.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c 
b/drivers/gpu/drm/radeon/radeon_display.c
index 652af7a134bd..1be50f949bb4 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -226,6 +226,8 @@ void radeon_crtc_load_lut(struct drm_crtc *crtc)
        if (!crtc->enabled)
                return;
 
+       sleep(50);
+
        if (ASIC_IS_DCE5(rdev))
                dce5_crtc_load_lut(crtc);
        else if (ASIC_IS_DCE4(rdev))
-- 
2.11.0