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From: Chris Ball <cjb@laptop.org>
To: Qiang Liu <b32616@freescale.com>
Cc: linux-mmc@vger.kernel.org, leoli@freescale.com, kumar.gala@freescale.com
Subject: Re: [PATCH] SD/MMC: fix the issue of SDHC performance regression
Date: Mon, 07 Nov 2011 08:20:10 -0500	[thread overview]
Message-ID: <m2ipmw133p.fsf@bob.laptop.org> (raw)
In-Reply-To: <1320658589-13143-1-git-send-email-b32616@freescale.com> (Qiang Liu's message of "Mon, 7 Nov 2011 17:36:29 +0800")

Hi,

On Mon, Nov 07 2011, Qiang Liu wrote:
> Low performance of SDHC (half of before) due to its frequency was set to 25MHz,
> but not 50MHz (involved by commit id 013909c4ffd16ded4895528b856fd8782df04dc6,
> add support for query function modes for uhs cards according to Physical Layer
> SPEC V3.01).
>
> Set high speed max frequency according to response status of CMD6, but
> not for SPEC Version. Response of switch command is first consideration
> factor when set SDHC max working frequency. TRAN_SPEED in CSD register
> will be seemed as the second factor.
>
> Signed-off-by: Qiang Liu <qiang.liu@freescale.com>

Have you seen:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=f2815f68dabbb373fd1c9f0fd4a609d486697c2b 
("mmc: sd: Handle SD3.0 cards not supporting UHS-I bus speed mode")

which is already in mainline?  I think your patch is identical.

Thanks,

- Chris.
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child

  parent reply	other threads:[~2011-11-07 13:20 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-07  9:36 [PATCH] SD/MMC: fix the issue of SDHC performance regression Qiang Liu
2011-11-07 10:08 ` Li Yang-R58472
2011-11-07 13:20 ` Chris Ball [this message]
2011-11-08  2:17   ` Liu Qiang-B32616
2011-11-08  9:47   ` Aaron Lu
2011-11-08 13:37     ` Chris Ball
2011-11-13 16:14       ` Subhash Jadavani
2011-11-13 16:45         ` Chris Ball
2011-11-13 18:11           ` Subhash Jadavani

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