[alsa-devel] [PATCH 1/2] ASoC: rt5640: Power down LDO while suspended

Stephen Warren swarren at wwwdotorg.org
Wed Oct 16 19:47:34 CEST 2013

On 10/16/2013 10:33 AM, Mark Brown wrote:
> From: Mark Brown <broonie at linaro.org>
> If we have control over the LDO then disable it during suspend; the device
> is already being put into reset so will be non-functional over suspend
> anyway and this will save a small amount of power.

The series,
Tested-by: Stephen Warren <swarren at nvidia.com>

On Tegra Beaver and Dalmore boards. As you may have noticed, Tegra audio
doesn't work after resume at the moment, but that's true irrespective of
these patches, and I believe is a problem without our DMA or I2S
drivers, and nothing to do with the CODEC. The CODEC certainly still
responds to I2C accesses (e.g. triggered by alsamixer) after this patch,
and wouldn't if the LDO1_EN GPIO wasn't correctly set.

More information about the Alsa-devel mailing list