From ad54567ad5d8e938ee6cf02e4f3867f18835ae6e Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Thu, 1 Aug 2019 18:01:17 -0400 Subject: [PATCH 1/2] 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/20190801220117.14952-1-lyude@redhat.com Signed-off-by: Lyude Paul Signed-off-by: Bjorn Helgaas Acked-by: Ben Skeggs Cc: Lukas Wunner Cc: Daniel Drake Cc: Aaron Plattner Cc: Peter Wu Cc: Ilia Mirkin Cc: Karol Herbst Cc: Maik Freudenberg --- 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 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); } From 7bafda88de20b2990461d253c5475007436e355c Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Thu, 15 Aug 2019 12:12:38 -0500 Subject: [PATCH 2/2] Documentation PCI: Fix pciebus-howto.rst filename typo 2e6422444894 ("Documentation: PCI: convert PCIEBUS-HOWTO.txt to reST") incorrectly renamed PCIEBUS-HOWTO.txt to picebus-howto.rst. Rename it to pciebus-howto.rst. Fixes: 2e6422444894 ("Documentation: PCI: convert PCIEBUS-HOWTO.txt to reST") Signed-off-by: Bjorn Helgaas --- Documentation/PCI/index.rst | 2 +- Documentation/PCI/{picebus-howto.rst => pciebus-howto.rst} | 0 2 files changed, 1 insertion(+), 1 deletion(-) rename Documentation/PCI/{picebus-howto.rst => pciebus-howto.rst} (100%) diff --git a/Documentation/PCI/index.rst b/Documentation/PCI/index.rst index f4c6121868c3..6768305e4c26 100644 --- a/Documentation/PCI/index.rst +++ b/Documentation/PCI/index.rst @@ -9,7 +9,7 @@ Linux PCI Bus Subsystem :numbered: pci - picebus-howto + pciebus-howto pci-iov-howto msi-howto acpi-info diff --git a/Documentation/PCI/picebus-howto.rst b/Documentation/PCI/pciebus-howto.rst similarity index 100% rename from Documentation/PCI/picebus-howto.rst rename to Documentation/PCI/pciebus-howto.rst