linux-kernel - Re: [PATCH 4/8] regmap: Add the LZO cache support

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Message-ID: <20110907191901.GC24703@sirena.org.uk>
Date:	Wed, 7 Sep 2011 20:19:01 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Matthieu CASTET <castet.matthieu@...e.Fr>
Cc:	linux-kernel@...r.kernel.org, dp@...nsource.wolfsonmicro.com
Subject: Re: [PATCH 4/8] regmap: Add the LZO cache support

On Mon, Sep 05, 2011 at 09:40:45PM +0000, Matthieu CASTET wrote:
> Dimitris Papastamos <dp <at> opensource.wolfsonmicro.com> writes:

Don't drop CCs from mails if you want people to actually read them.

> > This patch adds support for LZO compression when storing the register
> > cache.

> > For a typical device whose register map would normally occupy 25kB or 50kB
> > by using the LZO compression technique, one can get down to ~5-7kB.  

> Do you have example of such case ?

> Caching 25kB or 50kB looks crazy.

Audio CODECs for smartphones can easily have well over a thousand
registers (excluding things like DSP memories) connected over
rel;atively slow buses like I2C or SPI with lots of read/modify/write
cycles (so cutting out the physical read is a real win) and we want to
power them off when not in use.
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