On Tue, Nov 21, 2017 at 04:01:16PM +0100, Karol Herbst wrote: > This should make systems more stable where resuming the GPU fails. This > can happen due to bad firmware or due to a bug within the kernel. The > last thing which should happen in either case is an unusable system. > > v2: do the same in nouveau_pmops_resume > > Tested-by: Karl Hastings <ka...@redhat.com> > Signed-off-by: Karol Herbst <kher...@redhat.com> > --- > drm/nouveau/nouveau_drm.c | 31 +++++++++++++++++++++++-------- > 1 file changed, 23 insertions(+), 8 deletions(-) > > diff --git a/drm/nouveau/nouveau_drm.c b/drm/nouveau/nouveau_drm.c > index 8d4a5be3..6e4cb4f7 100644 > --- a/drm/nouveau/nouveau_drm.c > +++ b/drm/nouveau/nouveau_drm.c > @@ -792,6 +792,27 @@ nouveau_pmops_suspend(struct device *dev) > return 0; > } > > +static int > +nouveau_set_power_state_D0(struct pci_dev *pdev) > +{ > + struct nouveau_drm *drm = nouveau_drm(pci_get_drvdata(pdev)); > + int ret; > + > + pci_set_power_state(pdev, PCI_D0); > + /* abort if anything went wrong */ > + if (pdev->current_state != PCI_D0) { > + NV_ERROR(drm, "couldn't wake up GPU!\n"); > + return -EBUSY; > + }
Looks to me like the more idiomatic way to do this is: ret = pci_set_power_state(pdev, PCI_D0); if (ret < 0 && ret != -EIO) return ret; > + pci_restore_state(pdev); > + ret = pci_enable_device(pdev); > + if (ret) > + return ret; > + > + pci_set_master(pdev); Looking closer it also seems like pci_enable_device() will already set the power state to D0 (via do_pci_enable_device()). Is the sequence above really necessary because the hardware is quirky, or was it cargo-culted? Thierry
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