On Mon, Mar 23, 2015 at 08:40:58PM -0500, Liu, Bin wrote: > Felipe, > > > -----Original Message----- > > From: Balbi, Felipe > > Sent: Monday, March 23, 2015 7:37 PM > > To: Liu, Bin > > Cc: linux-usb@xxxxxxxxxxxxxxx; Balbi, Felipe > > Subject: Re: [PATCH] usb: musb: do not backup/restore registers in runtime PM > > callbacks > > > > On Mon, Mar 23, 2015 at 04:52:54PM -0500, Bin Liu wrote: > > > The MUSB controller does not lost power during runtime suspend/resume, > > > so unnecessary to backup/restore its registers. > > > > > > Signed-off-by: Bin Liu <b-liu@xxxxxx> > > > > are you sure this is true for *all* users of musb ? > > Well, I am not 100% sure, so posted this patch for comments ;) > > I checked MUSB only lost power during system suspend, in which case > musb_suspend/resume() are already called to backup/resume MUSB registers. bus this is only true for AM335x devices. OMAP3/4 have been doing off-while-idle for years :-) -- balbi
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