[alsa-devel] [PATCH 6/6 v3] ASoC: rsnd: Add Volume Ramp support

[Kuninori Morimoto]

Hi Mark

Thank you for your review

> > amixer set "DVC Out" 100%      // = Normal Volume
> > amixer set "DVC Out Ramp Up Rate"   "0.125 dB/64 steps"
> > amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
> > amixer set "DVC Out Ramp" 0%   // Mute = Normal Volume x 0%
> > amixer set "DVC Out Ramp" on   // Volume Ramp ON
> > aplay xxx.wav &
> > amixer set "DVC Out Ramp" 100% // Mute to Normal Volume x 100%
> > amixer set "DVC Out Ramp" 0%   // Normal Volume x 100% to Mute
> 
> Correct me if I'm wrong but I think what's confusing me here is that
> what I'd expect to happen is that setting the ramp rate would cause any
> volume change done by the user to ramp to the target volume (or mute)
> but it looks like what's actually happening is that the ramp control is
> providing an additional layer of volume control on top of the normal
> volume control.

Sorry for my poor explanation.
Yes, you are correct.
Volume Ramp chenges [ramp layer] (0% - 100%)
[ramp layer] is always 100% if you don't use Volume Ramp.

         [Normal Volume] x [ramp layer] = output

Please let me better/understandable naming.