From: Lyude Paul lyude@redhat.com
[ Upstream commit ad54567ad5d8e938ee6cf02e4f3867f18835ae6e ]
quirk_reset_lenovo_thinkpad_50_nvgpu() resets NVIDIA GPUs to work around an apparent BIOS defect. It previously used pci_reset_function(), and the available method was a bus reset, which was fine because there was only one function on the bus. After b516ea586d71 ("PCI: Enable NVIDIA HDA controllers"), there are now two functions (the HDA controller and the GPU itself) on the bus, so the reset fails.
Use pci_reset_bus() explicitly instead of pci_reset_function() since it's OK to reset both devices.
[bhelgaas: commit log, add e0547c81bfcf] Fixes: b516ea586d71 ("PCI: Enable NVIDIA HDA controllers") Fixes: e0547c81bfcf ("PCI: Reset Lenovo ThinkPad P50 nvgpu at boot if necessary") Link: https://lore.kernel.org/r/20190801220117.14952-1-lyude@redhat.com Signed-off-by: Lyude Paul lyude@redhat.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Acked-by: Ben Skeggs bskeggs@redhat.com Cc: Lukas Wunner lukas@wunner.de Cc: Daniel Drake drake@endlessm.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Peter Wu peter@lekensteyn.nl Cc: Ilia Mirkin imirkin@alum.mit.edu Cc: Karol Herbst kherbst@redhat.com Cc: Maik Freudenberg hhfeuer@gmx.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/quirks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 311f8a33e62ff..06be52912dcdb 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5162,7 +5162,7 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev) */ if (ioread32(map + 0x2240c) & 0x2) { pci_info(pdev, FW_BUG "GPU left initialized by EFI, resetting\n"); - ret = pci_reset_function(pdev); + ret = pci_reset_bus(pdev); if (ret < 0) pci_err(pdev, "Failed to reset GPU: %d\n", ret); }