linux-kernel - Re: [PATCH] MMC: Clean up low voltage range handling

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Date:	Mon, 12 Mar 2007 00:39:54 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Philip Langdale <philipl@...rt.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Carlos Aguiar <carlos.aguiar@...t.org.br>,
	juha.yrjola@...idboot.com
Subject: Re: [PATCH] MMC: Clean up low voltage range handling

Philip Langdale wrote:
> Clean up the handling of low voltage MMC cards.
>
>   
> The latest MMC and SD specs both agree that the low
> voltage range is defined as 1.65-1.95V and is signified
> by bit 7 in the OCR. An old Sandisk spec implied that
> bits 7-0 represented voltages below 2.0V in 1V increments,
> and the code was accordingly written with that expectation.
>
>   

We must not have the same specs. My simplified SD 2.0 physical spec
defines everything below bit 15 as reserved.

> This change switches the code to conform to the specs and
> fixes the SDHCI driver. It also removes the explicit
> defines for the host vdd and updates the SDHCI driver
> to convert the bit number back to the mask value
> for comparisons. Having only a single set of defines
> ensures there's nothing to get out of sync.
>
>   

Although this is a nice change, it confuses things to have two changes
in one commit. Could you split them up and base it on my "for-andrew"
branch?

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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