1. Initialize the counters to 0 in case the callback
fails to initialize them.
2. The counters don't exist on APUs so return an error
for them.
3. Return an error if the callback doesn't exist.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index bc7de2f62d12..72bbb8175b22 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -1646,9 +1646,15 @@ static ssize_t amdgpu_get_pcie_bw(struct device *dev,
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
- uint64_t count0, count1;
+ uint64_t count0 = 0, count1 = 0;
int ret;
+ if (adev->flags & AMD_IS_APU)
+ return -ENODATA;
+
+ if (!adev->asic_funcs->get_pcie_usage)
+ return -ENODATA;
+
ret = pm_runtime_get_sync(ddev->dev);
if (ret < 0)
return ret;
--
2.25.4
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