----- Original Message ----- > From: "Huang Ying" <ying.huang@xxxxxxxxx> > To: "David Airlie" <airlied@xxxxxxxxxx> > Cc: linux-pci@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "Bjorn Helgaas" <bhelgaas@xxxxxxxxxx>, "Rafael J. > Wysocki" <rjw@xxxxxxx> > Sent: Wednesday, 7 November, 2012 4:26:25 PM > Subject: Re: [PATCH] pci/runtime-pm: respect devices autosuspend timeout on config access > > On Wed, 2012-11-07 at 01:15 -0500, David Airlie wrote: > > > > > > > > Cc: Huang Ying <ying.huang@xxxxxxxxx> > > > > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > > > Cc: Rafael J. Wysocki <rjw@xxxxxxx> > > > > Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> > > > > --- > > > > drivers/pci/pci-sysfs.c | 2 +- > > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > > index 02d107b..12d3d52 100644 > > > > --- a/drivers/pci/pci-sysfs.c > > > > +++ b/drivers/pci/pci-sysfs.c > > > > @@ -487,7 +487,7 @@ pci_config_pm_runtime_put(struct pci_dev > > > > *pdev) > > > > struct device *dev = &pdev->dev; > > > > struct device *parent = dev->parent; > > > > > > > > - pm_runtime_put(dev); > > > > + pm_runtime_put_autosuspend(dev); > > > > if (parent) > > > > pm_runtime_put_sync(parent); > > > > } > > > > > > I think you do not need that. You can implement timeout > > > in .runtime_idle callback of the driver. > > > > If I understand what you are suggesting, I should setup some kinda > > of timer callback to later call suspend, but that seems pointless > > for me if we have the autosuspend mechanism in place. > > > > Won't I end up racing my timer against other pm stuff? I'm not > > really runtime pm expert so maybe I'm just missing something. > > You can call pm_runtime_autosuspend or pm_runtime_schedule_suspend > in .runtime_idle callback of the driver. Ah that explains what I was probably missing, I'll go play with that for a while then! Thanks, Dave. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
