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

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Message-Id: <20210222064653.22084-1-wangjingyu@uniontech.com>
Date:   Mon, 22 Feb 2021 14:46:53 +0800
From:   wangjingyu <wangjingyu@...ontech.com>
To:     alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie
Cc:     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] 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 | 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)
 		return;
 
+	msleep(50);
 	if (ASIC_IS_DCE5(rdev))
 		dce5_crtc_load_lut(crtc);
 	else if (ASIC_IS_DCE4(rdev))
-- 
2.11.0