>-----Original Message----- >From: Kevin Hilman [mailto:khilman@xxxxxxxxxxxxxxxxxxx] >Sent: Thursday, September 23, 2010 11:04 PM >To: Kalliguddi, Hema >Cc: Balbi, Felipe; linux-omap@xxxxxxxxxxxxxxx; >linux-usb@xxxxxxxxxxxxxxx; Basak, Partha; Tony Lindgren; >Cousson, Benoit; Paul Walmsley >Subject: Re: [PATCH 8/9 v3] usb : musb: Using runtime pm apis for musb. > >"Kalliguddi, Hema" <hemahk@xxxxxx> writes: > >> >> >>>-----Original Message----- >>>From: Kevin Hilman [mailto:khilman@xxxxxxxxxxxxxxxxxxx] >>>Sent: Thursday, September 23, 2010 9:00 PM >>>To: Balbi, Felipe >>>Cc: Kalliguddi, Hema; linux-omap@xxxxxxxxxxxxxxx; >>>linux-usb@xxxxxxxxxxxxxxx; Basak, Partha; Tony Lindgren; >>>Cousson, Benoit; Paul Walmsley >>>Subject: Re: [PATCH 8/9 v3] usb : musb: Using runtime pm >apis for musb. >>> >>>Felipe Balbi <balbi@xxxxxx> writes: >>> >>>> Hi, >>>> >>>> On Wed, Sep 22, 2010 at 07:30:30PM -0500, Kalliguddi, Hema wrote: >>>>>Calling runtime pm APIs pm_runtime_put_sync() and >>>pm_runtime_get_sync() >>>>>for enabling/disabling the clocks,sysconfig settings. >>>>> >>>>>Also need to put the USB in force standby and force idle >>>mode when usb not used >>>>>and set it back to no idle and no stndby after wakeup. >>>>>For OMAP3 auto idle bit has to be disabled because of the >>>errata.So using >>>>>HWMOD_NO_OCP_AUTOIDLE flag for OMAP3430. >>> >>>[...] >>> >>>>>@@ -2424,13 +2425,16 @@ static int musb_suspend(struct device *d >>>>> * they will even be wakeup-enabled. >>>>> */ >>>>> } >>>>>+ pm_runtime_put_sync(dev); >>>>> >>>>>+#ifndef CONFIG_PM_RUNTIME >>>>> musb_save_context(musb); >>>>> >>>>> if (musb->set_clock) >>>>> musb->set_clock(musb->clock, 0); >>>>> else >>>>> clk_disable(musb->clock); >>>>>+#endif >>>> >>>> I would rather remove these, adding ifdefs is bad :-( Unless >>>other archs >>>> (blackfin, davinci) would have problems if we remove those. >>> >>>I didn't like these #ifdefs either, but davinci doesn't have >>>runtime PM, >>>and I don't think blackfin does either. >>> >>>But, rather than the ifdef here, this could be done with different >>>pointers in struct dev_pm_ops based on the arch. >>> >>>Also, this shouldn't be based on CONFIG_PM_RUNTIME, but rather on the >>>arch. We can still enable runtime PM on davinci for other subsystems >>>(PCI, USB core, etc.) but not have it supported for on-chip devices. >>> >> Is it a good idea to use the musb->set_clock function >pointer for OMAP architure and >> call the runtime pm apis from this function defined in the >usb platform driver(omap2430) > >I guess that's Felipe's call, but I don't like that option. > >I think it's cleaner to have the ->set_clock hook be a noop on OMAP and >the runtime hooks be noops on the other platforms. > I think the set_clock function was used for setting the platform specific clocks for different architecture. Anyway we need this hook or some other hook once we start handling the optional clocks and internal phy clocks for musb. Since this is already exists I thought of making use of it instand of adding another hook. Felipe, What do you say? ~Hema >Kevin > >-- 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
