PCI: Reset both NVIDIA GPU and HDA in ThinkPad P50 workaround

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/[email protected]
Signed-off-by: Lyude Paul <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Ben Skeggs <[email protected]>
Cc: Lukas Wunner <[email protected]>
Cc: Daniel Drake <[email protected]>
Cc: Aaron Plattner <[email protected]>
Cc: Peter Wu <[email protected]>
Cc: Ilia Mirkin <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Maik Freudenberg <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 208aacf39329..44c4ae1abd00 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5256,7 +5256,7 @@ 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);
 	}