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

[Sascha Silbe]

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@xxxxxxxxx>

Tested-By: Sascha Silbe <sascha-pgp@xxxxxxxxx>

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

-- 
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