linux-kernel - RE: [PATCH 2/3] usb: chipidea: Fix Internal error: : 808 [#1] ARM related to STS flag

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Date:	Fri, 29 Nov 2013 04:47:30 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	Chris Ruehl <chris.ruehl@...ys.com.hk>
CC:	"alexander.shishkin@...ux.intel.com" 
	<alexander.shishkin@...ux.intel.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/3] usb: chipidea: Fix Internal error: : 808 [#1] ARM
 related to STS flag



 
> 
> On Friday, November 29, 2013 11:27 AM, Peter Chen wrote:
> >
> >> * init the sts flag to 0 (missed)
> >> * set the sts flag only if not 0
> >>
> > does PORTSC_STS bit as 1 or 0 affect your case?
> > If not, please remove hw_write(ci, OP_DEVLC, DEVLC_STS, sts),
> > since it is useless at current code logic.
> >
> > Peter
> 
> Peter,
> 
> in the switch statement sts is set to 1 therefore I think its used.
> 
>         case USBPHY_INTERFACE_MODE_SERIAL:
>                  portsc = PORTSC_PTS(PTS_SERIAL);
>                  lpm = DEVLC_PTS(PTS_SERIAL);
>                  sts = 1;
>                  break;
> 
> Regards
> Chris
> 
> 

Yes, you are right. It is just not showed at the patch.

Would you move the sts = 0 to sts declaration, it can reduce the code line.

u32 portsc, lpm, sts = 0;

> >
> >> Signed-off-by: Chris Ruehl <chris.ruehl@...ys.com.hk>
> >> ---
> >>   drivers/usb/chipidea/core.c |    8 ++++++--
> >>   1 file changed, 6 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> >> index 5075407..1a6010e 100644
> >> --- a/drivers/usb/chipidea/core.c
> >> +++ b/drivers/usb/chipidea/core.c
> >> @@ -245,6 +245,8 @@ static void hw_phymode_configure(struct ci_hdrc
> *ci)
> >>   {
> >>   	u32 portsc, lpm, sts;
> >>
> >> +	sts = 0;
> >> +
> >>   	switch (ci->platdata->phy_mode) {
> >>   	case USBPHY_INTERFACE_MODE_UTMI:
> >>   		portsc = PORTSC_PTS(PTS_UTMI);
> >> @@ -273,10 +275,12 @@ static void hw_phymode_configure(struct ci_hdrc
> *ci)
> >>
> >>   	if (ci->hw_bank.lpm) {
> >>   		hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
> >> -		hw_write(ci, OP_DEVLC, DEVLC_STS, sts);
> >> +		if (sts)
> >> +			hw_write(ci, OP_DEVLC, DEVLC_STS, sts);
> >>   	} else {
> >>   		hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
> >> -		hw_write(ci, OP_PORTSC, PORTSC_STS, sts);
> >> +		if ( sts )
> >> +			hw_write(ci, OP_PORTSC, PORTSC_STS, sts);
> >>   	}
> >>   }
> >>
> >> --
 


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