From: Pierre Ossman <drzeus-mmc@drzeus.cx>
To: "Bryan Wu" <cooloney.lkml@gmail.com>
Cc: "Cai, Cliff" <Cliff.Cai@analog.com>,
"Mike Frysinger" <vapier.adi@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [patch] split MMC_CAP_4_BIT_DATA
Date: Thu, 10 Jan 2008 12:57:48 +0100 [thread overview]
Message-ID: <20080110125748.416ad0c5@poseidon.drzeus.cx> (raw)
In-Reply-To: <386072610801100122n52339488ke2b8724c390be765@mail.gmail.com>
On Thu, 10 Jan 2008 17:22:55 +0800
"Bryan Wu" <cooloney.lkml@gmail.com> wrote:
>
> At page 4-3 of ADSP-BF54x Blackfin(R) Processor Peripheral Hardware
> Reference, there is a table which guide us the SDH controller does not
> support 4-bit mode MMC card. Please found the table picture in the
> attachment or get the document at:
> http://www.analog.com/UploadedFiles/Associated_Docs/61460151169789ADSP_BF54x_Blackfin_Processor_Peripheral_Hardware_Reference.pdf
>
Ok, but this just means the controller wasn't designed with 4-bit MMC in mind. As several other "SD-only" controller have been tested with modern MMC cards without a problem, this is not sufficient to explain any problem.
>
> Thanks, actually we are not yet convinced by our hardware designer
> why BF54x SDH does not support 4-bit MMC.
>
Please keep me informed on how it progresses. I'd like an at least plausible explanation, preferably also some empirical data, before I'm ready to accept Mike's patch.
Rgds
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org
next prev parent reply other threads:[~2008-01-10 11:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 18:29 Mike Frysinger
2008-01-08 19:21 ` Pierre Ossman
2008-01-08 19:40 ` Mike Frysinger
2008-01-08 20:49 ` Pierre Ossman
2008-01-08 21:44 ` Mike Frysinger
2008-01-09 7:21 ` Pierre Ossman
2008-01-09 2:32 ` Bryan Wu
2008-01-09 3:21 ` Cai, Cliff
2008-01-09 7:23 ` Pierre Ossman
2008-01-09 16:45 ` Bryan Wu
2008-01-10 8:54 ` Pierre Ossman
2008-01-10 9:22 ` Bryan Wu
2008-01-10 11:57 ` Pierre Ossman [this message]
2008-01-11 6:17 ` Bryan Wu
2008-01-11 6:25 ` Mike Frysinger
2008-01-11 8:40 ` Pierre Ossman
2008-01-11 9:08 ` Mike Frysinger
2008-01-11 9:35 ` Pierre Ossman
2008-01-11 9:47 ` Mike Frysinger
2008-01-11 10:05 ` Pierre Ossman
2008-01-11 10:22 ` Bryan Wu
2008-01-11 11:18 ` Pierre Ossman
2008-01-11 17:52 ` Robin Getz
2008-01-12 13:02 ` Robin Getz
2008-01-12 15:24 ` Bryan Wu
2008-01-12 15:39 ` Pierre Ossman
2008-01-09 4:23 ` Bryan Wu
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