linux-kernel - Re: [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency

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Message-ID: <BANLkTikoj6UTx08ntZaMM15taKRXjrU_Mg@mail.gmail.com>
Date:	Mon, 11 Apr 2011 11:03:18 +0200
From:	Per Forlin <per.forlin@...aro.org>
To:	anish singh <anish198519851985@...il.com>
Cc:	Jae hoon Chung <jh80.chung@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	Chris Ball <cjb@...top.org>
Subject: Re: [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency

On 10 April 2011 05:33, anish singh <anish198519851985@...il.com> wrote:
>
>
> On Sat, Apr 9, 2011 at 5:25 PM, Jae hoon Chung <jh80.chung@...il.com> wrote:
>>
>> Hi Per..
>>
>> I'm applied your patch..and sent the patch about dw_mmc.c.
>> I think good this approach..
>
> Forlin,i too want to test this patch of yours but unfortunately i have
> samsung board+SDHCI host controller so i guess i just need to write pre_req
> and post_req functions and that would enable this(nonblock mmc request) on
> my board.Hope i am right?
You are right. The  SDHCI driver should work just fine without
implementing pre_req and post_req but you wont see any performance
increasing for DMA usage.
In order to benefit from the patchset you need to implement pre_req
and post_req.

If you run into trouble implementing those hooks or if you have any
questions please let me know.

Regards,
Per
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