linux-kernel - Re: [PATCH v2] ARM: PL011: Add support for Rx DMA buffer polling

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Message-ID: <20130125202507.GB5470@kroah.com>
Date:	Fri, 25 Jan 2013 12:25:07 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Chanho Min <chanho.min@....com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, Pawel Moll <pawel.moll@....com>
Subject: Re: [PATCH v2] ARM: PL011: Add support for Rx DMA buffer polling

On Wed, Jan 23, 2013 at 02:07:57PM +0900, Chanho Min wrote:
> On Tue, Jan 22, 2013 at 10:18 PM, Linus Walleij
> <linus.walleij@...aro.org> wrote:
> >> - If poll timer is activated, We use consistent DMA mappings to avoid from
> >>   the frequent cache operation of the timer function. sg->coherency is used
> >>   to check if buffer is coherent.
> >
> > Hm. We can begin like this but maybe we should later patch it to
> > make this the default unless it has performance impacts on our
> > systems.
> Good, I really hope to make this the default.
> We expect it has no impact to system even if no polling use.
> 
> > Maybe this is a good opportunity to add some kerneldoc above
> > this struct so as to help platform implementers. It will invariably
> > be reused by Device Tree binding authors later on...
> Agree, but, frankly I need help about what I didn't modify.
> So We will leave this work for the next submit.

So, should this patch be applied?  Can I get an ack from someone who
knows this driver/platform please?

thanks,

greg k-h
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