linux-kernel - Re: [PATCH 1/2] USB: at91: fix the number of endpoint parameter

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Message-ID: <20140207083719.GY9558@ns203013.ovh.net>
Date:	Fri, 7 Feb 2014 09:37:19 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Bo Shen <voice.shen@...el.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] USB: at91: fix the number of endpoint parameter

On 10:06 Tue 21 Jan     , Nicolas Ferre wrote:
> On 21/01/2014 09:12, Bo Shen :
> > Hi J,
> > 
> > On 01/21/2014 01:49 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >> On 11:39 Mon 20 Jan     , Bo Shen wrote:
> >>> Hi J,
> >>>
> >>> On 01/18/2014 01:20 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >>>> On 10:59 Fri 17 Jan     , Bo Shen wrote:
> >>>>> In sama5d3 SoC, there are 16 endpoints. As the USBA_NR_ENDPOINTS
> >>>>> is only 7. So, fix it for sama5d3 SoC using the udc->num_ep.
> >>>>>
> >>>>> Signed-off-by: Bo Shen <voice.shen@...el.com>
> >>>>> ---
> >>>>>
> >>>>>   drivers/usb/gadget/atmel_usba_udc.c | 2 +-
> >>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>>>>
> >>>>> diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
> >>>>> index 2cb52e0..7e67a81 100644
> >>>>> --- a/drivers/usb/gadget/atmel_usba_udc.c
> >>>>> +++ b/drivers/usb/gadget/atmel_usba_udc.c
> >>>>> @@ -1670,7 +1670,7 @@ static irqreturn_t usba_udc_irq(int irq, void *devid)
> >>>>>   	if (ep_status) {
> >>>>>   		int i;
> >>>>>
> >>>>> -		for (i = 0; i < USBA_NR_ENDPOINTS; i++)
> >>>>> +		for (i = 0; i < udc->num_ep; i++)
> >>>>
> >>>> no the limit need to specified in the driver as a checkpoint by the compatible
> >>>> or platform driver id
> >>>
> >>> You mean, we should not trust the data passed from dt node or
> >>> platform data? Or do you think we should do double confirm?
> >>
> >> no base on the driver name or the compatible you will known the MAX EP
> >>
> >> not based on the dt ep description
> >>
> >> as we do on pinctrl-at91
> > 
> > I am sorry, I am not fully get it after reading the code of 
> > pinctrl-at91.c, can you give the example code in pinctrl-at91.c?
> > 
> > Btw, the udc->num_ep is get from the following code.
> > for dt
> > --->8---
> > 	while ((pp = of_get_next_child(np, pp)))
> > 		udc->num_ep++;
> > ---<8---
> > 
> > for non-dt
> > --->8---
> > 	udc->num_ep = pdata->num_ep;
> > ---8<---
> 
> It seems to me pretty valid to use num_ep in this driver and not have to
> rely on another compatibility string just for this.
> The information is here, it is retrieved pretty cleanly so I vote for a
> simple use of it: if we introduce another information we will have to
> double check the cross errors that would happen...

here is the key point you describe the HW

so choose detect the IP version and then check we do not describe  too many EP
or you prove the correct compatible so we known this not the same IP
and we can check the DT information

Best Regards,
J.
> 
> Bye,
> 
> >>>>>   			if (ep_status & (1 << i)) {
> >>>>>   				if (ep_is_control(&udc->usba_ep[i]))
> >>>>>   					usba_control_irq(udc, &udc->usba_ep[i]);
> >>>>> --
> >>>>> 1.8.5.2
> >>>>>
> >>>
> >>> Best Regards,
> >>> Bo Shen
> > 
> > Best Regards,
> > Bo Shen
> > 
> 
> 
> -- 
> Nicolas Ferre
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