linux-kernel - Re: [PATCH] MMC: Select only one voltage bit in OCR response

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Message-ID: <453B38EF.6050201@drzeus.cx>
Date:	Sun, 22 Oct 2006 11:25:03 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Russell King <rmk+lkml@....linux.org.uk>
CC:	Timo Teras <timo.teras@...idboot.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MMC: Select only one voltage bit in OCR response

(In case you've missed it)

Pierre Ossman wrote:
> Timo Teras wrote:
>> I see. But if we do send an OCR with an unsupported bit set, the card will
>> go to inactive state and is unusable. This problem is masked on controllers
>> with only 3.3V support, but I'm working with a controller supporting several
>> different voltages.
>>
>> For example, I have a card giving an OCR reply of 0x0ff80080. The current
>> code will reply to this with 0x00000180 which is clearly incorrect.
>>
>> Maybe something like "ocr &= 3 << bit;" would be more approriate?
>>   
> 
> Russell? Comments? Do you still have the offending card?
> 

-- 
     -- 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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