public inbox for linux-mmc@vger.kernel.org
 help / color / mirror / Atom feed
From: Chris Ball <cjb@laptop.org>
To: David Vrabel <david.vrabel@csr.com>
Cc: Nicolas Pitre <nico@fluxnic.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mmc@vger.kernel.org
Subject: Re: [PATCH 5/5] SDIO: put active devices into 1-bit mode during suspend
Date: Wed, 10 Feb 2010 11:32:23 -0500	[thread overview]
Message-ID: <m31vgt127c.fsf@pullcord.laptop.org> (raw)
In-Reply-To: <4B72D8CC.9030605@csr.com> (David Vrabel's message of "Wed, 10 Feb 2010 16:03:24 +0000")

Hi David,

   > I couldn't find anything in the SDIO specification (you know the
   > section number?).  Part A2 has a requirement that the controller
   > be placed into 1-bit mode but this doesn't mean that the card has
   > to be.

I think it's part E1 section 8, and does specify that it's necessary
for both host and card.

   > Maybe it's not really a big deal, a single command only costs a
   > few 10s of microseconds anyway.

Yeah, and it's only being sent on a powered-suspend, which so far OLPC
is the only user of -- I'd rather have the next user tell us it isn't
necessary than break it for them by introducing an incorrect quirk.

Thanks,

- Chris.
-- 
Chris Ball   <cjb@laptop.org>
One Laptop Per Child

  reply	other threads:[~2010-02-10 16:34 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-09 20:29 [PATCH 0/5] SDIO support for "powered" suspend Nicolas Pitre
2010-02-09 20:29 ` [PATCH 1/5] SDIO: introduce API for special power management features Nicolas Pitre
2010-02-11 20:32   ` Andrew Morton
2010-02-11 20:57     ` Nicolas Pitre
2010-02-09 20:29 ` [PATCH 2/5] SDIO: sdhci support for suspend mode PM features Nicolas Pitre
2010-02-09 20:29 ` [PATCH 3/5] SDIO: Don't use CMD[357] as part of a powered SDIO resume Nicolas Pitre
2010-02-09 20:29 ` [PATCH 4/5] SDIO: kick the interrupt thread upon a resume Nicolas Pitre
2010-02-09 20:29 ` [PATCH 5/5] SDIO: put active devices into 1-bit mode during suspend Nicolas Pitre
2010-02-10 11:30   ` David Vrabel
2010-02-10 15:17     ` Chris Ball
2010-02-10 16:03       ` David Vrabel
2010-02-10 16:32         ` Chris Ball [this message]
2010-02-10 16:49           ` David Vrabel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=m31vgt127c.fsf@pullcord.laptop.org \
    --to=cjb@laptop.org \
    --cc=akpm@linux-foundation.org \
    --cc=david.vrabel@csr.com \
    --cc=linux-mmc@vger.kernel.org \
    --cc=nico@fluxnic.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox