linux-kernel - Re: [patch 5/7] SDHCI: Samsung SDHCI (HSMMC) driver

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Date:	Wed, 19 Nov 2008 19:38:36 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org,
	sdhci-devel@...t.drzeus.cx
Subject: Re: [patch 5/7] SDHCI: Samsung SDHCI (HSMMC) driver

On Sun, 16 Nov 2008 00:03:02 +0000
Ben Dooks <ben-linux@...ff.org> wrote:

> On Fri, Nov 14, 2008 at 10:48:13PM +0100, Pierre Ossman wrote:
> > On Mon, 03 Nov 2008 20:09:49 +0000
> > Ben Dooks <ben-linux@...ff.org> wrote:
> > > +	if (pdata->cfg_card)
> > > +		pdata->cfg_card(ourhost->pdev, host->ioaddr,
> > > +				ios, host->mmc->card);
> > 
> > What's the deal here? Hosts shouldn't know more about the card than the
> > MMC core tells them.
> 
> Depending on exactly which version, there's a number of configurations
> in the extra configuration registers that get changed, such as delays
> used for clock feedback which are meant to be chnaged when the speed
> of the card is changed. Unfortunately this changes depending on the
> chip model and possibly also on the board it is on.
> 
> The other is that it is possible that depending on the chip and board
> combination things like the GPIO driver-strength controls will need to
> be changed.

I don't see where knowledge about the card gets into the picture here.
All of this sounds like information that is gathered from platform data
and/or ios information.

-- 
     -- Pierre Ossman

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

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