From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Matthieu CASTET <castet.matthieu@free.Fr>
Cc: linux-kernel@vger.kernel.org, dp@opensource.wolfsonmicro.com
Subject: Re: [PATCH 4/8] regmap: Add the LZO cache support
Date: Wed, 7 Sep 2011 20:19:01 +0100 [thread overview]
Message-ID: <20110907191901.GC24703@sirena.org.uk> (raw)
In-Reply-To: <loom.20110905T233927-790@post.gmane.org>
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.
next prev parent reply other threads:[~2011-09-07 19:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-02 15:46 [PATCH 0/8] Introduce caching support for regmap Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 1/8] regmap: Introduce caching support Dimitris Papastamos
2011-09-02 20:02 ` Lars-Peter Clausen
2011-09-02 23:48 ` Mark Brown
2011-09-03 1:10 ` Dimitris Papastamos
2011-09-04 15:57 ` Mark Brown
2011-09-05 9:44 ` Dimitris Papastamos
2011-09-05 9:43 ` Dimitris Papastamos
2011-09-05 9:55 ` Lars-Peter Clausen
2011-09-05 10:00 ` Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 2/8] regmap: Add the indexed cache support Dimitris Papastamos
2011-09-02 20:16 ` Lars-Peter Clausen
2011-09-05 9:55 ` Dimitris Papastamos
2011-09-05 10:14 ` Lars-Peter Clausen
2011-09-05 18:22 ` Mark Brown
2012-07-17 11:16 ` Mark Brown
2012-07-17 14:24 ` Lars-Peter Clausen
2011-09-02 15:46 ` [PATCH 3/8] regmap: Add the rbtree " Dimitris Papastamos
2011-09-02 20:22 ` Lars-Peter Clausen
2011-09-05 9:58 ` Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 4/8] regmap: Add the LZO " Dimitris Papastamos
2011-09-05 21:40 ` Matthieu CASTET
2011-09-07 19:19 ` Mark Brown [this message]
2011-09-02 15:46 ` [PATCH 5/8] regmap: Add the regcache_sync trace event Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 6/8] regmap: Incorporate the regcache core into regmap Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 7/8] regmap: It is impossible to be given a NULL defaults cache Dimitris Papastamos
2011-09-02 15:46 ` [PATCH 8/8] regmap: Support NULL cache_defaults_raw Dimitris Papastamos
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