[alsa-devel] [PATCH v2 0/8] ASoC: TWL4030: put the codec to off when not active

Liam Girdwood lrg at slimlogic.co.uk
Mon May 31 11:39:09 CEST 2010

On Wed, 2010-05-26 at 11:38 +0300, Peter Ujfalusi wrote:
> Hello,
> Changes since v1:
> - Patch 3: removed the shifting of offset cancellation value
> - Added register content reset functionality as suggested by Liam and Mark
> I have added Mark's Acked-by to patch 1-7, patch 8 is a new one, which shall
> address the comments regarding to the register content reset.
> To-do after this series:
> Revisit the register reset functionality to use burst write.
> Intro mail from the original series:
> The following series at the end will let the twl4030 codec to use BIAS_OFF
> instead of BIAS_STANDBY.
> The difference in power consumption is about 0.5mA.
> To achieve this:
> - The regcache has been reseted to codec default
> - The codec initialization has been optimized, it is no longer writes all 73
>   registers at startup, but only modifies few selected one.
> - The power related code has been cleaned up, and optimized
> - Support added for machine drivers to select the offset cancellation path
> - debug support for checking the codec default registers (machine drivers can
>   ask for checking, but shall be disabled in production).
> - Added codec register reset functionality
> I guess that's it.
> The driver has been tested on a custom board with twl5031. It passed all of our
> internal test cases covering much of the codec features.
> ---
> Peter Ujfalusi (8):
>   ASoC: TWL4030: Revisit codec defaults
>   ASoC: TWL4030: Remove wrapper for power down
>   ASoC: TWL4030: Make offset cancellation path configurable
>   ASoC: TWL4030: Optimize the power up sequence
>   ASoC: TWL4030: Helper to check chip default registers
>   ASoC: TWL4030: Correct the ARXR2_APGA_CTL chip default
>   ASoC: TWL4030: Use BIAS_OFF instead of BIAS_STANDBY, when not in use
>   ASoC: TWL4030: Add functionalty to reset the registers
>  sound/soc/codecs/twl4030.c |  291 +++++++++++++++++++++++++-------------------
>  sound/soc/codecs/twl4030.h |    3 +
>  2 files changed, 169 insertions(+), 125 deletions(-)



Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.

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