linux-kernel - Re: [PATCH RESEND 3/3] usb: gadget: udc: atmel: implement .pullup callback

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Message-ID: <bec0cf9f-d937-c4fb-5073-5fc152be2417@microchip.com>
Date:   Thu, 16 Jul 2020 18:01:02 +0000
From:   <Cristian.Birsan@...rochip.com>
To:     <alexandre.belloni@...tlin.com>, <mirq-linux@...e.qmqm.pl>
CC:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>,
        <Ludovic.Desroches@...rochip.com>, <Nicolas.Ferre@...rochip.com>,
        <songjun.wu@...el.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH RESEND 3/3] usb: gadget: udc: atmel: implement .pullup
 callback



On 7/16/20 12:58 AM, Alexandre Belloni wrote:
> 
> On 08/07/2020 20:04:10+0200, Michał Mirosław wrote:
>> Implement udc->pullup callback, so that udc_connect/disconnect work.
>> This is needed for composite gadget, as it assumes udc_disconnect()
>> actually works and calls its ->disconnect callback.
>>
>> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

Acked-by: Cristian Birsan <cristian.birsan@...rochip.com>

I checked the patch on sama5d2_xplained board and monitored the traffic with a sniffer. Everything looks good.

> 
>> ---
>>  drivers/usb/gadget/udc/atmel_usba_udc.c | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
>> index 9342a3d24963..c5128c229c52 100644
>> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
>> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
>> @@ -1028,6 +1028,7 @@ usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
>>       return 0;
>>  }
>>
>> +static int atmel_usba_pullup(struct usb_gadget *gadget, int is_on);
>>  static int atmel_usba_start(struct usb_gadget *gadget,
>>               struct usb_gadget_driver *driver);
>>  static int atmel_usba_stop(struct usb_gadget *gadget);
>> @@ -1101,6 +1102,7 @@ static const struct usb_gadget_ops usba_udc_ops = {
>>       .get_frame              = usba_udc_get_frame,
>>       .wakeup                 = usba_udc_wakeup,
>>       .set_selfpowered        = usba_udc_set_selfpowered,
>> +     .pullup                 = atmel_usba_pullup,
>>       .udc_start              = atmel_usba_start,
>>       .udc_stop               = atmel_usba_stop,
>>       .match_ep               = atmel_usba_match_ep,
>> @@ -1957,6 +1959,24 @@ static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
>>       return IRQ_HANDLED;
>>  }
>>
>> +static int atmel_usba_pullup(struct usb_gadget *gadget, int is_on)
>> +{
>> +     struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
>> +     unsigned long flags;
>> +     u32 ctrl;
>> +
>> +     spin_lock_irqsave(&udc->lock, flags);
>> +     ctrl = usba_readl(udc, CTRL);
>> +     if (is_on)
>> +             ctrl &= ~USBA_DETACH;
>> +     else
>> +             ctrl |= USBA_DETACH;
>> +     usba_writel(udc, CTRL, ctrl);
>> +     spin_unlock_irqrestore(&udc->lock, flags);
>> +
>> +     return 0;
>> +}
>> +
>>  static int atmel_usba_start(struct usb_gadget *gadget,
>>               struct usb_gadget_driver *driver)
>>  {
>> --
>> 2.20.1
>>
> 
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>