linux-kernel - RE: [PATCH 04/21] usb: chipidea: Only read/write OTGSC from one place

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Date:	Mon, 27 Jun 2016 12:07:54 -0700
From:	Stephen Boyd <stephen.boyd@...aro.org>
To:	Jun Li <jun.li@....com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"Andy Gross" <andy.gross@...aro.org>,
	"Bjorn Andersson" <bjorn.andersson@...aro.org>,
	"Neil Armstrong" <narmstrong@...libre.com>,
	"Arnd Bergmann" <arnd@...db.de>, "Felipe Balbi" <balbi@...nel.org>,
	"Peter Chen" <peter.chen@....com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Ivan T. Ivanov" <iivanov.xz@...il.com>
Subject: RE: [PATCH 04/21] usb: chipidea: Only read/write OTGSC from one place

Quoting Jun Li (2016-06-27 01:04:39)
> > diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c index
> > 03b6743461d1..763a8332b009 100644
> > --- a/drivers/usb/chipidea/otg.c
> > +++ b/drivers/usb/chipidea/otg.c
> > @@ -104,7 +104,32 @@ void ci_handle_vbus_change(struct ci_hdrc *ci)
> >               usb_gadget_vbus_disconnect(&ci->gadget);
> >  }
> > 
> > -#define CI_VBUS_STABLE_TIMEOUT_MS 5000
> > +/**
> > + * Sometimes, it needs to wait register value before going on.
> > + * Eg, when switch to device mode, the vbus value should be lower
> > + * than OTGSC_BSV before connects to host.
> 
> This should be updated since this API is dedicated for BSV now.

Ok I've updated it to say:

  When we switch to device mode, the vbus value should be lower
  than OTGSC_BSV before connecting to host.

> 
> > + *
> > + * @ci: the controller
> > + *
> > + * This function returns an error code if timeout  */ static int
> > +hw_wait_otgsc_bsv(struct ci_hdrc *ci) {
> > +     unsigned long elapse = jiffies + msecs_to_jiffies(5000);
> > +     u32 mask = OTGSC_BSV;
> > +
> > +     while (!hw_read_otgsc(ci, mask)) {
> 
> Reverse logic, should be:
> while (hw_read_otgsc(ci, mask)) {
> 

Good catch! Thanks.