linux-kernel - [PATCH 5.15 62/72] drm/amdgpu: always reset the asic in suspend (v2)

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Date:   Mon, 10 Jan 2022 08:23:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Luben Tuikov <luben.tuikov@....com>,
        Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 62/72] drm/amdgpu: always reset the asic in suspend (v2)

From: Alex Deucher <alexander.deucher@....com>

[ Upstream commit daf8de0874ab5b74b38a38726fdd3d07ef98a7ee ]

If the platform suspend happens to fail and the power rail
is not turned off, the GPU will be in an unknown state on
resume, so reset the asic so that it will be in a known
good state on resume even if the platform suspend failed.

v2: handle s0ix

Acked-by: Luben Tuikov <luben.tuikov@....com>
Acked-by: Evan Quan <evan.quan@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 70e8a86c3a69f..9dfd9d70812cb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1526,7 +1526,10 @@ static int amdgpu_pmops_suspend(struct device *dev)
 	adev->in_s3 = true;
 	r = amdgpu_device_suspend(drm_dev, true);
 	adev->in_s3 = false;
-
+	if (r)
+		return r;
+	if (!adev->in_s0ix)
+		r = amdgpu_asic_reset(adev);
 	return r;
 }
 
-- 
2.34.1