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

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Date:   Thu,  4 Mar 2021 09:25:35 +0800
From:   wangjingyu <wangjingyu@...ontech.com>
To:     alexander.deucher@....com
Cc:     christian.koenig@....com, airlied@...ux.ie, daniel@...ll.ch,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        wangjingyu <wangjingyu@...ontech.com>,
        zhuyong <zhuyong@...ontech.com>
Subject: [PATCH] MIPS: drm/radeon: A gray screen appears when going into  hibernation(S4)

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@...ontech.com>
Signed-off-by: zhuyong <zhuyong@...ontech.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