[alsa-devel] [PATCH 1/1] ASoC: sgtl5000: enable VAG_POWER for LINE_IN

On Sat, Jul 28, 2012 at 10:39:59PM +0800, Shawn Guo wrote:

On Fri, Jul 27, 2012 at 07:18:42PM +0800, Dong Aisheng wrote:

quoted

LINE_IN also needs VAG_POWER on or we may hear noise when directly
route LINE_IN to Headphone Mux.

The following is what I see from sgtl5000 data sheet about VAG_POWER.

  VAG is the internal voltage reference for the ADC and DAC.

Are you seeing any info that requires VAG_POWER in route of LINE_IN to
Headphone Mux?  Or it's only a result from your testing?

Given the name I rather suspect that's a datasheet error and the same
reference is used by other bits of the chip.  Just guessing, though.