linux-kernel - Re: [PATCH 2/3 v2] usb: chipidea: Fix Internal error: : 808 [#1] ARM related to STS flag

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Message-ID: <5299407C.30109@gtsys.com.hk>
Date:	Sat, 30 Nov 2013 09:33:48 +0800
From:	Chris Ruehl <chris.ruehl@...ys.com.hk>
To:	Michael Grzeschik <mgr@...gutronix.de>
CC:	alexander.shishkin@...ux.intel.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3 v2] usb: chipidea: Fix Internal error: : 808 [#1]
 ARM related to STS flag

On Saturday, November 30, 2013 02:28 AM, Michael Grzeschik wrote:
> On Fri, Nov 29, 2013 at 03:19:45PM +0800, Chris Ruehl wrote:
>> 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
>>
>> 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 = 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);
>
> The conditions coding style is broken.
>
>>   	}
>>   }
>
> Still don't get why a system with ehci compliant PORTSC register
> should not want to have the sts bit _explicitly_ set to 0 if
> we don't use serial phy mode. So NACK!
>
> Michael

That's happen when I remove the if() statements and unconditional write the sts flag

[    1.128482] ehci-mxc: Freescale On-Chip EHCI Host driver
[    1.136702] usbcore: registered new interface driver usb-storage
[    1.147594] imx_usb 10024000.usb: dummy supplies not allowed
[    1.154803] Unhandled fault: external abort on non-linefetch (0x808) at 
0xf4424184
[    1.162424] Internal error: : 808 [#1] ARM
[    1.166548] Modules linked in:
[    1.169670] CPU: 0 PID: 1 Comm: swapper Not tainted 
3.13.0-rc1-next-20131125-dirty #44
[    1.177629] task: cf850000 ti: cf852000 task.ti: cf852000
[    1.183086] PC is at ci_hdrc_probe+0x250/0x630
[    1.187582] LR is at console_unlock+0x2d4/0x30c
[    1.192165] pc : [<c025f7a8>]    lr : [<c003ec50>]    psr: 60000013


regards
Chris

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