From: Chris Ball <cjb@laptop.org>
To: "Marc-André Hébert" <hebert.marcandre@gmail.com>
Cc: linux-mmc <linux-mmc@vger.kernel.org>
Subject: Re: Stopping mmc clock between transfers
Date: Wed, 25 May 2011 11:54:53 -0400 [thread overview]
Message-ID: <m3aaeasrle.fsf@pullcord.laptop.org> (raw)
In-Reply-To: <BANLkTikbm_OjtwB4fhwj1Mc0HAsNPH3CVg@mail.gmail.com> ("Marc-André Hébert"'s message of "Tue, 24 May 2011 14:42:32 -0400")
Hi Marc-André,
On Tue, May 24 2011, Marc-André Hébert wrote:
> We are using a OMAPL108 with 2.6.33 and noticed that the mmc clock
> signal stays active when idle. This doesn't seem very power efficient
> and we wondered if there was a reason for this. Before trying to fix
> this on our side I had a few questions regarding this:
> -Is this behavior the same in more recent versions?
> -Was this designed to be this way?
> -Would stopping the clock be a responsibility of the core (set_ios) or
> the host controller (between requests)?
Check out CONFIG_MMC_CLKGATE=y, introduced in 2.6.38.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
prev parent reply other threads:[~2011-05-25 15:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 18:42 Stopping mmc clock between transfers Marc-André Hébert
2011-05-25 15:54 ` Chris Ball [this message]
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