pci_is_thunderbolt_attached() requires an upstream PCI bridge with
is_thunderbolt set from an Intel Thunderbolt VSEC. This does not cover
the affected ASM4242 USB4 PCI hierarchy:
00:02.2
\- 0f:00.0 [1b21:2421]
+- 10:01.0 [1b21:2423] -> 45:00.0 -> 46:00.0
| -> 47:00.0 -> 48:00.0 -> 49:00.0 [1002:7590]
\- 10:03.0 -> 76:00.0 [1b21:2425] USB4 Host Router
The host router is outside the GPU upstream bridge chain, leaving no
ancestor with is_thunderbolt set. PCI core propagates DEVICE_REMOVABLE
below the external-facing PCIe tunnel. Disable Runtime PM when either
pci_is_thunderbolt_attached() or dev_is_removable() is true.
Signed-off-by: Yang Wang <[email protected]>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 8ebe24d59ab6..a4b4f9645c84 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -609,6 +609,13 @@ void amdgpu_device_detect_runtime_pm_mode(struct
amdgpu_device *adev)
int bamaco_support;
adev->pm.rpm_mode = AMDGPU_RUNPM_NONE;
+ if (pci_is_thunderbolt_attached(adev->pdev) ||
+ dev_is_removable(&adev->pdev->dev)) {
+ dev_info(adev->dev,
+ "Runtime PM disabled for externally attached
device\n");
+ return;
+ }
+
bamaco_support = amdgpu_device_supports_baco(adev);
switch (amdgpu_runtime_pm) {
--
2.54.0
