Re: [RFC] Add dB scale information to AK4xxx codec

["Jochen Voß" <voss@maths.warwick.ac.uk>]

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Hi Takashi,

On Mon, Sep 04, 2006 at 11:58:57AM +0200, Takashi Iwai wrote:
> > From table 17 (page 35) of the AK5365 specs I think that IPGA and DATT
> > are only separate units inside the chip, but should be treated as one
> > continuous scale for the purpose of the driver.  The table looks like
> > the input volume can be adjusted in steps from "mute" to +12dB.  Why
> > would we want two controls here?
> 
> Actually they are treated independently in the chip.  IPGA works like
> a preamp, and the total volume is IPGA + DATT.  Even if you set a
> value to IPGA with MSB, say 0x82, DATT won't be changed and the old
> value is kept.  And it's vice versa - if you set 0x02 later, IPGA will
> stay as 0x82.  This is so, at least with AK4524 and AK4528.  Possibly
> this was changed on AK5365, though...
Did you have a look at table 17?  I think the old behaviour was better.

> Hm, there is no "PCM Capture Gain Capture", maybe "PCM Capture Gain
> Volume"?  It's IPGA.
I will send the amixer output this evening when I get back home.

All the best,
Jochen
-- 
http://www.maths.warwick.ac.uk/~voss/

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