linux-kernel - Re: [alsa-devel] [PATCH 7/9] ASoC: da7210: Add support for ALC and Noise suppression

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Date:	Thu, 13 Oct 2011 11:26:03 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Chavan <ashish.chavan@...tcummins.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	alsa-devel <alsa-devel@...a-project.org>, lrg@...com,
	kuninori.morimoto.gx@...esas.com,
	David Dajun Chen <david.chen@...semi.com>
Subject: Re: [alsa-devel] [PATCH 7/9] ASoC: da7210: Add support for ALC and
 Noise suppression

On Thu, Oct 13, 2011 at 02:45:45PM +0530, Ashish Chavan wrote:
> On Wed, 2011-10-12 at 16:04 +0100, Mark Brown wrote:

> > No, don't go peering directly into the register cache.  This is going to
> > explode if the board configures a different cache style and means you
> > can't change the cache type later.  Just read the register and trust
> > that the cache will do something sane.

> Will update the code to directly read the register. I thought of saving
> some io bandwidth and if I remember correctly, I saw few exiting drivers
> doing this.

The whole point of having the register cache is that reads don't result
in any actual I/O, if there's any I/O happening we need to fix the
register cache code.
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