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:
From: Dong Aisheng dong.aisheng@linaro.org
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?
No, it's from the test result. Maybe i should have added a FIXME for this.
Does it also fix the noise issue you mentioned with normal recording (LINE_IN to ADC) before?
ADC also needs VAG power which already fixed by: commit f0cdcf3 (ASoC: sgtl5000: Enable VAG when DAC/ADC up) This patch is only for direct LINE_IN to Headphone Mux.
Regards Dong Aisheng