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

On Saturday 12 February 2011 07:22:20 Chuanxiao Dong wrote:
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>

Great stuff! I needed this for a project of mine, but couldn't
get it to work reliably without knowing about the timeout logic.

I think, almost no mmc controllers advertice MMC_CAP_ERASE today,
which is a real shame, given that it's extremely useful for performance.

Arnd
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