[alsa-devel] [PATCH 0/7] ASoC: TWL4030: put the codec to off when not active

Peter Ujfalusi peter.ujfalusi at nokia.com
Tue May 25 13:34:01 CEST 2010


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).

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 (7):
  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

 sound/soc/codecs/twl4030.c |  286 ++++++++++++++++++++++++--------------------
 sound/soc/codecs/twl4030.h |    2 +
 2 files changed, 157 insertions(+), 131 deletions(-)

More information about the Alsa-devel mailing list