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

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commit 134b8c5d86 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mario Limonciello
2023-09-26 17:59:53 -05:00
committed by Greg Kroah-Hartman
parent 1ad7ccd45a
commit 0da6d21ba2
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -2225,7 +2225,7 @@ 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;
}