linux-kernel - RE: [PATCH 3/8][v3]usb:fsl:otg: Add support to add/remove usb host driver

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Message-ID: <Pine.LNX.4.44L0.1508201008480.1272-100000@iolanthe.rowland.org>
Date:	Thu, 20 Aug 2015 10:09:54 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ramneek Mehresh <ramneek.mehresh@...escale.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Li Leo <LeoLi@...escale.com>
Subject: RE: [PATCH 3/8][v3]usb:fsl:otg: Add support to add/remove usb host
 driver

On Thu, 20 Aug 2015, Ramneek Mehresh wrote:

> > > --- a/drivers/usb/host/ehci-fsl.h
> > > +++ b/drivers/usb/host/ehci-fsl.h
> > > @@ -63,4 +63,22 @@
> > >  #define UTMI_PHY_EN             (1<<9)
> > >  #define ULPI_PHY_CLK_SEL        (1<<10)
> > >  #define PHY_CLK_VALID		(1<<17)
> > > +
> > > +struct ehci_fsl {
> > > +#ifdef CONFIG_PM
> > > +	/* Saved USB PHY settings, need to restore after deep sleep. */
> > > +	u32 usb_ctrl;
> > > +#endif
> > 
> > Do you need this #ifdef?
> > 
> Yes, this is required for deep-sleep support...we need to save/restore controller
> registers during deep-sleep when usb controller power is shut-off. Don't need this
> during normal usb operation...saving/restoring usb controller registers in non deep-sleep
> scenario will add unnecessary delays

What I meant was, can you keep the "u32 usb_ctrl;" line but get rid of
the "#ifdef CONFIG_PM" and "#endif" lines?

Alan Stern

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