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From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Daniel Mack <daniel@caiaq.de>,
	Matt Fleming <matt@console-pimps.org>,
	David Brownell <dbrownell@users.sourceforge.net>,
	Eric Miao <eric.y.miao@gmail.com>,
	Linus Walleij <linus.walleij@stericsson.com>,
	Jarkko Lavinen <jarkko.lavinen@nokia.com>,
	linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Cliff Brake <cbrake@bec-systems.com>,
	Pierre Ossman <pierre@ossman.eu>,
	Liam Girdwood <lrg@slimlogic.co.uk>,
	Robert Jarzmik <robert.jarzmik@free.fr>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org,
	Adrian Hunter <adrian.hunter@nokia.com>
Subject: Re: [PATCH] mmc: move regulator handling to core
Date: Thu, 3 Dec 2009 15:09:55 +0000	[thread overview]
Message-ID: <20091203150955.GA10297@rakim.wolfsonmicro.main> (raw)
In-Reply-To: <20091203145825.GA26651@n2100.arm.linux.org.uk>

On Thu, Dec 03, 2009 at 02:58:25PM +0000, Russell King - ARM Linux wrote:
> On Thu, Dec 03, 2009 at 01:22:41PM +0000, Mark Brown wrote:

> > without power control).  This goes back to the thing about using
> > regulator_get_exclusive(), the message given was that the MMC drivers
> > really needed to be able to guarantee that the power would be removed
> > when that was requested.

> If you take some cards through a series of steps and they stop responding,
> it's normally because you've caused their internal state machine to
> transition to "invalid" mode.

> Further commands are ignored.  The only recovery is to power cycle them.

I assume that this is something it's desirable to be able to do in the
face of poor hardware rather than something that the Linux MMC stack is
actively using in normal operation (modulo issues with the general
quality of implementation of MMC hardware)?

WARNING: multiple messages have this Message-ID (diff)
From: broonie@opensource.wolfsonmicro.com (Mark Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: move regulator handling to core
Date: Thu, 3 Dec 2009 15:09:55 +0000	[thread overview]
Message-ID: <20091203150955.GA10297@rakim.wolfsonmicro.main> (raw)
In-Reply-To: <20091203145825.GA26651@n2100.arm.linux.org.uk>

On Thu, Dec 03, 2009 at 02:58:25PM +0000, Russell King - ARM Linux wrote:
> On Thu, Dec 03, 2009 at 01:22:41PM +0000, Mark Brown wrote:

> > without power control).  This goes back to the thing about using
> > regulator_get_exclusive(), the message given was that the MMC drivers
> > really needed to be able to guarantee that the power would be removed
> > when that was requested.

> If you take some cards through a series of steps and they stop responding,
> it's normally because you've caused their internal state machine to
> transition to "invalid" mode.

> Further commands are ignored.  The only recovery is to power cycle them.

I assume that this is something it's desirable to be able to do in the
face of poor hardware rather than something that the Linux MMC stack is
actively using in normal operation (modulo issues with the general
quality of implementation of MMC hardware)?

  reply	other threads:[~2009-12-03 15:09 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-03 12:46 [PATCH] mmc: move regulator handling to core Daniel Mack
2009-12-03 12:46 ` Daniel Mack
2009-12-03 13:06 ` Mark Brown
2009-12-03 13:06   ` Mark Brown
2009-12-03 13:14   ` Daniel Mack
2009-12-03 13:14     ` Daniel Mack
2009-12-03 13:22     ` Mark Brown
2009-12-03 13:22       ` Mark Brown
2009-12-03 13:32       ` Daniel Mack
2009-12-03 13:32         ` Daniel Mack
2009-12-03 13:40         ` Mark Brown
2009-12-03 13:40           ` Mark Brown
2009-12-03 13:43           ` Daniel Mack
2009-12-03 13:43             ` Daniel Mack
2009-12-03 14:58       ` Russell King - ARM Linux
2009-12-03 14:58         ` Russell King - ARM Linux
2009-12-03 15:09         ` Mark Brown [this message]
2009-12-03 15:09           ` Mark Brown
2009-12-03 14:27 ` Adrian Hunter
2009-12-03 14:27   ` Adrian Hunter
2009-12-03 14:27   ` Adrian Hunter
2009-12-03 19:20   ` Daniel Mack
2009-12-03 19:20     ` Daniel Mack
2009-12-03 19:20     ` Daniel Mack
2009-12-03 20:12     ` Adrian Hunter
2009-12-03 20:12       ` Adrian Hunter
2009-12-03 20:12       ` Adrian Hunter
2009-12-04 11:58       ` Daniel Mack
2009-12-04 11:58         ` Daniel Mack
2009-12-04 11:58         ` Daniel Mack
2009-12-12  0:58         ` Daniel Mack
2009-12-12  0:58           ` Daniel Mack
2009-12-12  0:58           ` Daniel Mack
2009-12-14 17:43           ` Madhusudhan
2009-12-14 17:43             ` Madhusudhan
2009-12-14 17:43             ` Madhusudhan
2009-12-15  5:44         ` David Brownell
2009-12-15  5:44           ` David Brownell
2009-12-15  5:44           ` David Brownell
2010-08-27 19:03 ` Chris Ball
2010-08-27 19:03   ` Chris Ball
2010-08-28 14:48   ` Linus Walleij
2010-08-28 14:48     ` Linus Walleij
2010-08-29 13:27     ` Mark Brown
2010-08-29 13:27       ` Mark Brown
2010-08-29 15:30       ` Linus Walleij
2010-08-29 15:30         ` Linus Walleij
2010-08-31 11:07         ` Mark Brown
2010-08-31 11:07           ` Mark Brown
2010-08-31 12:15           ` Linus Walleij
2010-08-31 12:15             ` Linus Walleij
2010-08-31 12:15             ` Linus Walleij

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