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

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Message-ID: <453327EC.1000402@drzeus.cx>
Date:	Mon, 16 Oct 2006 08:34:20 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Timo Teras <timo.teras@...idboot.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MMC: Select only one voltage bit in OCR response

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
  OLPC, developer                     http://www.laptop.org

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