Hi, >-----Original Message----- >From: Sergei Shtylyov [mailto:[email protected]] >Sent: Tuesday, August 10, 2010 4:50 PM >To: Kalliguddi, Hema >Cc: Sergei Shtylyov; [email protected]; >[email protected]; Mankad, Maulik Ojas; Felipe Balbi; >Tony Lindgren; Kevin Hilman >Subject: Re: [PATCH V2 6/8] usb: musb: Offmode fix for idle path > >Hello. > >Kalliguddi, Hema wrote: > >>>> With OMAP core-off support musb was not functional as >context was getting >>>> lost after wakeup from core-off. And also musb was >blocking the core-off >>>> after loading the gadget driver even with no cable >connected sometimes. > >>>> Added the conext save/restore api in the platform layer which will >>>> be called in the idle and wakeup path. >>>> Changed the usb sysconfig settings as per the usbotg >functional spec. >>>> When the device is not active, configure to force idle and >force standby mode. >>>> When it is being used, configure in smart standby and >smart idle mode. >>>> So while attempting to coreoff the usb is configured to >force standby and >>>> force idle mode, after wakeup configured in smart idle and >smart standby. > >>>> Signed-off-by: Hema HK <[email protected]> >>>> Signed-off-by: Maulik Mankad <[email protected]> >>>> Cc: Felipe Balbi <[email protected]> >>>> Cc: Tony Lindgren <[email protected]> >>>> Cc: Kevin Hilman <[email protected]> > >>> [...] > >>>> Index: linux-omap-pm/drivers/usb/musb/musb_core.c >>>> =================================================================== >>>> --- linux-omap-pm.orig/drivers/usb/musb/musb_core.c >>> 2010-08-06 09:24:21.069863329 -0400 >>>> +++ linux-omap-pm/drivers/usb/musb/musb_core.c >>> 2010-08-06 10:44:06.369863527 -0400 >>>> @@ -2427,11 +2427,6 @@ >>>> } >>>> >>>> musb_save_context(musb); >>>> - >>>> - if (musb->set_clock) >>>> - musb->set_clock(musb->clock, 0); >>>> - else >>>> - clk_disable(musb->clock); >>>> spin_unlock_irqrestore(&musb->lock, flags); >>>> return 0; >>>> } >>>> @@ -2443,12 +2438,6 @@ >>>> >>>> if (!musb->clock) >>>> return 0; >>>> - >>>> - if (musb->set_clock) >>>> - musb->set_clock(musb->clock, 1); >>>> - else >>>> - clk_enable(musb->clock); >>>> - >>>> musb_restore_context(musb); > >>> The same question again: are you sure that clocks are >auto-gated on >>> non-OMAP platfroms? > >> Bon Lui confirmed that there is no clock for blackfin. > > What about DaVinci (and the coming DA8xx)? >
I checked with Ajay, it is not auto gated for for Davinci so I can't just remove this. I am thinking of adding a member variable(clk_autogated) in them usb_hdrc_platform_data structure and check this in the musb_suspend() And musb_resume() APIs. Do you see any problem with it? Regards, Hema >WBR, Sergei > >-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
