This is a note to let you know that I've just added the patch titled
drm/amd: Fix detection of _PR3 on the PCIe root port
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-fix-detection-of-_pr3-on-the-pcie-root-port.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 134b8c5d8674e7cde380f82e9aedfd46dcdd16f7 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@xxxxxxx>
Date: Tue, 26 Sep 2023 17:59:53 -0500
Subject: drm/amd: Fix detection of _PR3 on the PCIe root port
From: Mario Limonciello <mario.limonciello@xxxxxxx>
commit 134b8c5d8674e7cde380f82e9aedfd46dcdd16f7 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@xxxxxxxxxxxxxxx
Suggested-by: Jun Ma <Jun.Ma2@xxxxxxx>
Tested-by: David Perry <David.Perry@xxxxxxx>
Fixes: b10c1c5b3a4e ("drm/amdgpu: add check for ACPI power resources")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2225,7 +2225,7 @@ static int amdgpu_device_ip_early_init(s
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;
}
Patches currently in stable-queue which might be from mario.limonciello@xxxxxxx are
queue-5.15/drm-amd-fix-detection-of-_pr3-on-the-pcie-root-port.patch
