linux-kernel - Re: [RFC] New MMC driver model

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Date:	Wed, 10 Jan 2007 21:34:15 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	pierre Tardy <tardyp@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] New MMC driver model

(Please keep me as cc as I will almost always overlook you replies
otherwise)

pierre Tardy wrote:
> Pierre Ossman <drzeus-list <at> drzeus.cx> writes:
> 
>> Register functions
>> ==================
>>
>> I also intend to write a couple of register functions (sdio_read[bwl])
>> so that card drivers doesn't have to deal with MMC requests more than
>> necessary.
> 
> Good idea. Another need may be a sdio_read[bwl]_sync, which will poll for the
> end of the cmd52s, instead of waiting for the irq. This polling is faster than
> wait_for_completion/irq/tasklet/complete mechanism, which involve several
> context switches. 
> 

Hadn't thought of that. I will have to do some tests once I have
something functional.

>>  Endianness can also be handled there (SDIO are always LE).
> I dont remember sdio spec forcing HW registers to be LE. Function 0 registers
> are (BLKSZ for ex), but Function 1-7 register may be BE if the designers found
> an advantage to it..
> 

Hmm... It's been a while since I read the spec, but perhaps the LE
requirement was only for the base registers.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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