On Wed, 29 Jun 2011, Partha Basak wrote: > >-----Original Message----- > >From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] > >Sent: Wednesday, June 29, 2011 11:03 PM > >To: Munegowda, Keshava > >Cc: Kevin Hilman; linux-usb@xxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx; > >linux-kernel@xxxxxxxxxxxxxxx; balbi@xxxxxx; gadiyar@xxxxxx; > >sameo@xxxxxxxxxxxxxxx; parthab@xxxxxxxxxxxx; tony@xxxxxxxxxxx; b- > >cousson@xxxxxx; paul@xxxxxxxxx > >Subject: Re: [PATCH 4/4] mfd: global Suspend and resume support of ehci > >and ohci > > > >On Wed, 29 Jun 2011, Munegowda, Keshava wrote: > > > >> for usb host case , I am seeing that the pm_runtime_get_sync > >> > >> > >> static int rpm_resume(struct device *dev, int rpmflags) > >> { > >> ............ > >> .......... > >> if (dev->pwr_domain) { > >> callback = dev->pwr_domain->ops.runtime_resume; > >> if(!strcmp(dev_name(dev),"usbhs_omap")) > >> pr_err("dev->pwr_domain->ops.runtime_resume"); > >> } > >> else if (dev->type && dev->type->pm) { > >> callback = dev->type->pm->runtime_resume; > >> if(!strcmp(dev_name(dev),"usbhs_omap")) > >> pr_err("dev->type->pm->runtime_resume"); > >> } > >> else if (dev->class && dev->class->pm) { > >> callback = dev->class->pm->runtime_resume; > >> if(!strcmp(dev_name(dev),"usbhs_omap")) > >> pr_err("ev->class->pm->runtime_resume"); > >> } > >> else if (dev->bus && dev->bus->pm) { > >> callback = dev->bus->pm->runtime_resume; > >> if(!strcmp(dev_name(dev),"usbhs_omap")) > >> pr_err("dev->bus->pm->runtime_resume"); > >> } > >> else > >> callback = NULL; > >> } > >> > >> > >> I am seeing that below if statement was hitting true: > >> > >> if (dev->pwr_domain) { > >> callback = dev->pwr_domain->ops.runtime_resume; > >> if(!strcmp(dev_name(dev),"usbhs_omap")) > >> pr_err("dev->pwr_domain->ops.runtime_resume"); > >> > >> > >> due to this; the driver->runtime_resume was not getting called. > >> > >> Any idea on why I am seeing only the dev->pwr_domain is set not > >> dev->bus && dev->bus->pm is hitting here? > > > >Because the PM domain takes precedence over the subsystem for PM > >callbacks. If the subsystem routine should be called then the PM > >domain code has to call it. > > This is taken care of in the pm-domain code: > static int _od_runtime_resume(struct device *dev) > { > struct platform_device *pdev = to_platform_device(dev); > > omap_device_enable(pdev); > > return pm_generic_runtime_resume(dev); > } > pm_generic_runtime_resume will in turn call the driver call back. > > int pm_generic_runtime_resume(struct device *dev) > { > const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : > NULL; > int ret; > > ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0; > > return ret; > } You appear to be contradicting what Keshava wrote: "due to this; the driver->runtime_resume was not getting called." You can't both be right. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
