drm/amd: Check if ASPM is enabled from PCIe subsystem

From Mario Limonciello
ea44fcee7e3d87725423c904306a99cd42bd24b7 in linux 5.15.y/5.15.26
7294863a6f01248d72b61d38478978d638641bee in mainline linux

2 files changed, 8 insertions, 1 deletions

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_drv.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_drv.c
index 0914e142eb9..ce524e36159 100644
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_drv.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_drv.c
@@ -1279,6 +1279,9 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 	bool is_fw_fb;
 	resource_size_t base, size;
 
+	if (amdgpu_aspm == -1 && !pcie_aspm_enabled(pdev))
+		amdgpu_aspm = 0;
+
 	if (amdgpu_virtual_display ||
 	    amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
 		supports_atomic = true;
diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_kms.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_kms.c
index 193f66774a3..e8cbeabd125 100644
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_kms.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_kms.c
@@ -1855,7 +1855,7 @@ amdgpu_attach(struct device *parent, struct device *self, void *aux)
 
 	printf("\n");
 
-	/* from amdgpu_pci_probe() */
+	/* from amdgpu_pci_probe(), aspm test done later */
 
 	if (!amdgpu_virtual_display &&
 	     amdgpu_device_asic_has_dc_support(adev->family))
@@ -1880,6 +1880,10 @@ amdgpu_attach(struct device *parent, struct device *self, void *aux)
 	adev->pdev = dev->pdev;
 	adev->is_fw_fb = adev->primary;
 
+	/* from amdgpu_pci_probe() */
+	if (amdgpu_aspm == -1 && !pcie_aspm_enabled(adev->pdev))
+		amdgpu_aspm = 0;
+
 	if (!supports_atomic)
 		dev->driver_features &= ~DRIVER_ATOMIC;