linux-kernel - Re: [PATCH v4 2/3]mmc: enable TRIM/ERASE caps for SDHCI host

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Date:	Sun, 03 Apr 2011 11:41:41 +0200
From:	Sascha Silbe <sascha-ml-reply-to-2011-2@...be.org>
To:	Chuanxiao Dong <chuanxiao.dong@...el.com>
Cc:	linux-mmc <linux-mmc@...r.kernel.org>, cjb <cjb@...top.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>,
	adrian.hunter@...tty.sascha.silbe.org, <adrian.hunter@...ia.com>
Subject: Re: [PATCH v4 2/3]mmc: enable TRIM/ERASE caps for SDHCI host

Excerpts from Chuanxiao Dong's message of Sat Feb 12 07:22:20 +0100 2011:
> SDHCI host controller has TRIM/ERASE capability, enable these caps for erasing
> purpose.
> 
> ERASE command needs R1B response. So for such command with busy signal, before
> sending command, SDHCI host driver will simply set a maximum value for timeout
> control register which is safe to use.
> 
> Signed-off-by: Chuanxiao Dong <chuanxiao.dong@...el.com>

Tested-By: Sascha Silbe <sascha-pgp@...be.org>

Tested on an OLPC XO-1 using a SanDisk 4GB class 4 card (retail). The
BLKDISCARD ioctl (range 0..card size) returned immediately, no timeout
issue encountered.

Sascha

-- 
http://sascha.silbe.org/
http://www.infra-silbe.de/

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