From: Pierre Ossman <pierre@ossman.eu>
To: "Wolfgang Mües" <wolfgang.mues@auerswald.de>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Matt Fleming" <matt@console-pimps.org>,
"David Brownell" <dbrownell@users.sourceforge.net>,
"Mike Frysinger" <vapier.adi@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mmc_spi: fail gracefully if host or card do not support the switch command
Date: Mon, 15 Jun 2009 21:24:09 +0200 [thread overview]
Message-ID: <20090615212409.14e7a51b@mjolnir.ossman.eu> (raw)
In-Reply-To: <200906151036.05884.wolfgang.mues@auerswald.de>
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On Mon, 15 Jun 2009 10:36:05 +0200
Wolfgang Mües <wolfgang.mues@auerswald.de> wrote:
> Am Samstag, 13. Juni 2009 schrieb Pierre Ossman:
> > For SD there are several checks
> > before the switch command is actually issued.
>
> But there are two cases not covered by these checks:
>
> a) the switch command is supported, but the card is not capable of switching
> to 50 MHz.
>
But a successful switch command (even if the response is that the card
cannot do it) should not need the checks you added. The switch data
structure is checked further down.
> b) the card rejects the switch command in SPI mode, because it is not
> mandatory here.
I cannot see anything in the spec backing up this claim.
Rgds
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next prev parent reply other threads:[~2009-06-15 19:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-11 15:13 Wolfgang Mües
2009-06-13 11:08 ` Pierre Ossman
2009-06-15 8:36 ` Wolfgang Mües
2009-06-15 19:24 ` Pierre Ossman [this message]
2009-09-09 13:02 Wolfgang Mües
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