BL_INTERNAL: sound: codecs: tas2562: refactor volume control get function

tas2562_volume_control_get() assumes that Digital Volume is only changed using the correspondent ALSA Control. However, it can also be changed by directly writing to DVC_CFG[1-4] registers, or by a software reset.

To ensure tas2562_volume_control_get() returns the current digital volume level of the amplifier, update the function so that it reads the registers instead of returning the data internally stored.

Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com

Closes MAN-236

requested review from @nkbelin

assigned to @JulienMasson

@vsatoes do we still need this change ?

I believe so. I'll check with GE if they already merged on their side, but this was a feature they had asked for.