linux-kernel - [PATCH] PCI: Use pci_reset_bus() in quirk_reset_lenovo_thinkpad_50

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Message-Id: <20190801220117.14952-1-lyude@redhat.com>
Date:   Thu,  1 Aug 2019 18:01:17 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     nouveau@...ts.freedesktop.org, linux-pci@...r.kernel.org,
        Lukas Wunner <lukas@...ner.de>
Cc:     Daniel Drake <drake@...lessm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Aaron Plattner <aplattner@...dia.com>,
        Peter Wu <peter@...ensteyn.nl>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Karol Herbst <kherbst@...hat.com>,
        Maik Freudenberg <hhfeuer@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: Use pci_reset_bus() in quirk_reset_lenovo_thinkpad_50_nvgpu()

Since quirk_nvidia_hda() was added there's now two nvidia device
functions on any laptops with nvidia GPUs: the HDA controller, and the
GPU itself. Unfortunately this has the sideaffect of breaking
quirk_reset_lenovo_thinkpad_50_nvgpu() since pci_reset_function() was
using pci_parent_bus_reset() to reset the GPU's respective PCI bus, and
pci_parent_bus_reset() does not work on busses which have more then a
single device function present.

So, fix this by simply calling pci_reset_bus() instead which properly
resets the GPU bus and all device functions under it, including both the
GPU and the HDA controller.

Fixes: b516ea586d71 ("PCI: Enable NVIDIA HDA controllers")
Cc: Lukas Wunner <lukas@...ner.de>
Cc: Daniel Drake <drake@...lessm.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Aaron Plattner <aplattner@...dia.com>
Cc: Peter Wu <peter@...ensteyn.nl>
Cc: Ilia Mirkin <imirkin@...m.mit.edu>
Cc: Karol Herbst <kherbst@...hat.com>
Cc: Maik Freudenberg <hhfeuer@....de>
Cc: linux-pci@...r.kernel.org
Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 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);
 	}
-- 
2.21.0