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drm/amd: Fix detection of _PR3 on the PCIe root port 

On some systems with Navi3x dGPU will attempt to use BACO for runtime
PM but fails to resume properly.  This is because on these systems
the root port goes into D3cold which is incompatible with BACO.

This happens because in this case dGPU is connected to a bridge between
root port which causes BOCO detection logic to fail.  Fix the intent of
the logic by looking at root port, not the immediate upstream bridge for
_PR3.

Cc: stable@vger.kernel.org
Suggested-by: Jun Ma <Jun.Ma2@amd.com>
Tested-by: David Perry <David.Perry@amd.com>
Fixes: b10c1c5b3a ("drm/amdgpu: add check for ACPI power resources")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello 2023-09-26 17:59:53 -05:00 committed by Alex Deucher
parent ade134ddae
commit c4c8955b8a
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -2238,7 +2238,7 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev)
adev->flags |= AMD_IS_PX;
if (!(adev->flags & AMD_IS_APU)) {
parent = pci_upstream_bridge(adev->pdev);
parent = pcie_find_root_port(adev->pdev);
adev->has_pr3 = parent ? pci_pr3_present(parent) : false;
}