4.4-stable review patch. If anyone has any objections, please let me know.
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From: Karol Herbst kherbst@redhat.com
[ Upstream commit a121027d2747168df0aac0c3da35509eea39f61c ]
On my GP107 when I load nouveau after unloading it, for some reason the GPU stopped sending or the CPU stopped receiving interrupts if MSI was enabled.
Doing a rearm once before getting any interrupts fixes this.
Signed-off-by: Karol Herbst kherbst@redhat.com Reviewed-by: Thierry Reding treding@nvidia.com Signed-off-by: Ben Skeggs bskeggs@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c @@ -127,6 +127,13 @@ nvkm_pci_init(struct nvkm_subdev *subdev return ret;
pci->irq = pdev->irq; + + /* Ensure MSI interrupts are armed, for the case where there are + * already interrupts pending (for whatever reason) at load time. + */ + if (pci->msi) + pci->func->msi_rearm(pci); + return ret; }