From: Ratchanan Srirattanamet peathot@hotmail.com
[ Upstream commit 11d24327c2d7ad7f24fcc44fb00e1fa91ebf6525 ]
The call site of nouveau_dsm_pci_probe() uses single set of output variables for all invocations. So, we must not write anything to them unless it's an NVIDIA device. Otherwise, if we are called with another device after the NVIDIA device, we'll clober the result of the NVIDIA device.
For example, if the other device doesn't have _PR3 resources, the detection later would miss the presence of power resource support, and the rest of the code will keep using Optimus DSM, breaking power management for that machine.
Also, because we're detecting NVIDIA's DSM, it doesn't make sense to run this detection on a non-NVIDIA device anyway. Thus, check at the beginning of the detection code if this is an NVIDIA card, and just return if it isn't.
This, together with commit d22915d22ded ("drm/nouveau/devinit/tu102-: wait for GFW_BOOT_PROGRESS == COMPLETED") developed independently and landed earlier, fixes runtime power management of the NVIDIA card in Lenovo Legion 5-15ARH05. Without this patch, the GPU resumption code will "timeout", sometimes hanging userspace.
As a bonus, we'll also stop preventing _PR3 usage from the bridge for unrelated devices, which is always nice, I guess.
Fixes: ccfc2d5cdb02 ("drm/nouveau: Use generic helper to check _PR3 presence") Signed-off-by: Ratchanan Srirattanamet peathot@hotmail.com Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/79 Reviewed-by: Karol Herbst kherbst@redhat.com Signed-off-by: Karol Herbst kherbst@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/DM6PR19MB2780805D4BE1E3F9B3AC9... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/nouveau/nouveau_acpi.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index 69a84d0197d0a..7b946d44ab2c1 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -220,6 +220,9 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out int optimus_funcs; struct pci_dev *parent_pdev;
+ if (pdev->vendor != PCI_VENDOR_ID_NVIDIA) + return; + *has_pr3 = false; parent_pdev = pci_upstream_bridge(pdev); if (parent_pdev) {