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

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Message-ID: <20131129105024.GC28906@pengutronix.de>
Date:	Fri, 29 Nov 2013 11:50:24 +0100
From:	Michael Grzeschik <mgr@...gutronix.de>
To:	Chris Ruehl <chris.ruehl@...ys.com.hk>
Cc:	alexander.shishkin@...ux.intel.com, gregkh@...uxfoundation.org,
	linux-usb@...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 Fri, Nov 29, 2013 at 10:07:49AM +0800, Chris Ruehl wrote:
> * init the sts flag to 0 (missed)
> * set the sts flag only if not 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;
> +

This makes sense, but should be moved up to the
variable declartion:

-  	u32 portsc, lpm, sts;
+  	u32 portsc, lpm, 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);

What is wrong with explicit setting DEVLC_STS to 0 if we
know that we don't use serial phy mode?

>  	} 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);
>  	}
>  }

ditto

Regards,
Michael

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