linux-kernel - Re: [PATCH] usb: musb: dsps: implement vbus

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Date:	Thu, 8 Oct 2015 17:07:14 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Roman Alyautdin <ralyautdin@....rtsoft.ru>, balbi@...com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: musb: dsps: implement vbus_status method

On 10/8/2015 4:50 PM, Sergei Shtylyov wrote:

>> Implement vbus_status  method of musb_platform_ops that allows
>> musb_core to properly represent the VBUS status of musb_dsps devices in
>> corresponding sysfs entry
>>
>> Signed-off-by: Roman Alyautdin <ralyautdin@....rtsoft.ru>
>> ---
>>   drivers/usb/musb/musb_dsps.c |   13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>>
>> diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
>> index 84512d1..9c00edf 100644
>> --- a/drivers/usb/musb/musb_dsps.c
>> +++ b/drivers/usb/musb/musb_dsps.c
>> @@ -632,6 +632,18 @@ static void dsps_read_fifo32(struct musb_hw_ep *hw_ep,
>> u16 len, u8 *dst)
>>       }
>>   }
>>
>> +static int dsps_musb_vbus_status(struct musb *musb)
>> +{
>> +    void __iomem *mregs = musb->mregs;
>> +    u8 devctl;
>> +
>> +    devctl = dsps_readb(mregs, MUSB_DEVCTL);
>> +    if ((devctl & MUSB_DEVCTL_VBUS) == (3 << MUSB_DEVCTL_VBUS_SHIFT))
>
>     I don't see why this has to be is implemented in the DSPS glue layer. The
> DevCtl register is a standard MUSB one.

    Looking at the musb_platform_get_vbus_status(), it's unclear why it 
returns 0 if the vbus_status() method id undefined. I think we should read the 
DevCtl registre here, removing the FIXME at the call site.

MBR, Sergei

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