[PATCH AUTOSEL 5.4 055/350] drm/amd/powerplay: A workaround to GPU RESET on APU

Sasha Levin sashal at kernel.org
Tue Dec 10 21:02:40 UTC 2019

From: chen gong <curry.gong at amd.com>

[ Upstream commit 068ad870bbd8f4f2c5b2fd4977a4f3330c9988f4 ]

Changes to function "smu_suspend" in amdgpu_smu.c is a workaround.

We should get real information about if baco is enabled or not, while we
always consider APU SMU feature as enabled in current code.

I know APU do not support baco mode for GPU reset, so I use
"adev->flags" to skip function "smu_feature_is_enabled".

Signed-off-by: chen gong <curry.gong at amd.com>
Reviewed-by: Aaron Liu <aaron.liu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index 4acf139ea0140..58c091ab67b26 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -1344,7 +1344,10 @@ static int smu_suspend(void *handle)
 	int ret;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	struct smu_context *smu = &adev->smu;
-	bool baco_feature_is_enabled = smu_feature_is_enabled(smu, SMU_FEATURE_BACO_BIT);
+	bool baco_feature_is_enabled = false;
+	if(!(adev->flags & AMD_IS_APU))
+		baco_feature_is_enabled = smu_feature_is_enabled(smu, SMU_FEATURE_BACO_BIT);
 	ret = smu_system_features_control(smu, false);
 	if (ret)

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