linux-kernel - [PATCH 4.4 175/342] drm/amdgpu: fix tonga smu resume

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Date:	Tue, 01 Mar 2016 23:54:45 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Junwei Zhang <Jerry.Zhang@....com>,
	Christian König <christian.koenig@....com>,
	Ken Wang <Qingqing.Wang@....com>,
	Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.4 175/342] drm/amdgpu: fix tonga smu resume

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit e160e4db833c7e8587ec3c88efaed0d84f1bcf42 upstream.

Need to make sure smu buffers are pinned on resume.  This
matches what Fiji does.

Reviewed-by: Junwei Zhang <Jerry.Zhang@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Reviewed-by: Ken Wang <Qingqing.Wang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/tonga_dpm.c |   17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/tonga_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/tonga_dpm.c
@@ -122,25 +122,12 @@ static int tonga_dpm_hw_fini(void *handl
 
 static int tonga_dpm_suspend(void *handle)
 {
-	return 0;
+	return tonga_dpm_hw_fini(handle);
 }
 
 static int tonga_dpm_resume(void *handle)
 {
-	int ret;
-	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-
-	mutex_lock(&adev->pm.mutex);
-
-	ret = tonga_smu_start(adev);
-	if (ret) {
-		DRM_ERROR("SMU start failed\n");
-		goto fail;
-	}
-
-fail:
-	mutex_unlock(&adev->pm.mutex);
-	return ret;
+	return tonga_dpm_hw_init(handle);
 }
 
 static int tonga_dpm_set_clockgating_state(void *handle,