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

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Message-ID: <CAOAMb1ACPx6iXWDYz7LnrbRLkLmK9HU7Lro7H5gqpSKr24ooVA@mail.gmail.com>
Date:	Wed, 23 Jan 2013 14:07:57 +0900
From:	Chanho Min <chanho.min@....com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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 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.

Thanks
Chanho
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