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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201102120934.04679.arnd@arndb.de>
Date:	Sat, 12 Feb 2011 09:34:04 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Chuanxiao Dong <chuanxiao.dong@...el.com>
Cc:	linux-mmc@...r.kernel.org, cjb@...top.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	adrian.hunter@...ia.com
Subject: 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@...el.com>

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/