linux-kernel - Re: [PATCHv1 2/2] usb: gadget: add udc driver for max3420

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Message-ID: <874kxeksc5.fsf@kernel.org>
Date:   Thu, 02 Jan 2020 13:31:22 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Jassi Brar <jassisinghbrar@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCHv1 2/2] usb: gadget: add udc driver for max3420


Hi,

Jassi Brar <jassisinghbrar@...il.com> writes:
>> > +static void __max3420_start(struct max3420_udc *udc)
>> > +{
>> > +     u8 val;
>> > +
>> > +     /* Need this delay if bus-powered */
>> > +     msleep_interruptible(250);
>>
>> should you check if you're bus powered?
>>
> for some reason, even for self-powered, it helped reliability.

Perhaps update the comment, in that case? It would be better if we had
a proper explanation for this sleep here.

>> > +static int max3420_thread(void *dev_id)
>>
>> Why do you need this thread? Sure you can't live without it?
>>
> All the slow spi-bus transfers are handled at one place here without
> blocking any api call. IMO it is cleaner and easier to manage.

Fair enough, I won't complain. But it looks odd :-p

-- 
balbi

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