>-----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; } > >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
