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 03:27:28 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	Chris Ruehl <chris.ruehl@...ys.com.hk>,
	"alexander.shishkin@...ux.intel.com" 
	<alexander.shishkin@...ux.intel.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"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

 
> 
> * 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

> 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);
>  	}
>  }
> 
> --
> 1.7.10.4
> 
> --
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