linux-kernel - Re: [PATCH RESEND V4 2/9] mailbox: Add NVIDIA Tegra XUSB mailbox driver

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Date:	Thu, 30 Oct 2014 09:57:59 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>,
	Kishon Vijay Abraham I <kishon@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH RESEND V4 2/9] mailbox: Add NVIDIA Tegra XUSB mailbox driver

On Thu, Oct 30, 2014 at 6:22 AM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Wed, Oct 29, 2014 at 11:02:36AM -0700, Andrew Bresticker wrote:
> [...]
>> > Maybe something like this patch would be more correct in handling
>> > this:
>> >
>> > diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
>> > index afcb430508ec..85691a7d8ca6 100644
>> > --- a/drivers/mailbox/mailbox.c
>> > +++ b/drivers/mailbox/mailbox.c
>> > @@ -117,10 +117,11 @@ static void poll_txdone(unsigned long data)
>> >                 struct mbox_chan *chan = &mbox->chans[i];
>> >
>> >                 if (chan->active_req && chan->cl) {
>> > -                       resched = true;
>> >                         txdone = chan->mbox->ops->last_tx_done(chan);
>> >                         if (txdone)
>> >                                 tx_tick(chan, 0);
>> > +                       else
>> > +                               resched = true;
>> >                 }
>> >         }
>>
>> ... but we still need to re-arm the timer if tx_tick() submits another
>> message.  Perhaps the better thing to do is to have msg_submit() arm
>> the timer.
>
> I think we need both. If the last transmission isn't done yet we still
> want to keep polling. And we also want to poll if a new message is sent
> subsequently.
>
> Perhaps it would be as easy as moving the poll handling code from
> mbox_send_message() (if (chan->txdone_method == TXDONE_BY_POLL)) into
> msg_submit()? That has the additional advantage of being able to omit
> the polling when an error happens during the mbox' .send_data().

Yes, this is exactly what I've done :).
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