[PATCH 12/18] ASoC: codecs: mt6357: add MT6357 codec

[Mark Brown]

On Fri, Mar 15, 2024 at 12:01:12PM +0100, Alexandre Mergnat wrote:
> On 13/03/2024 18:23, Mark Brown wrote:
> > On Tue, Mar 12, 2024 at 07:03:25PM +0100, Alexandre Mergnat wrote:

> > > Actually you must save the values because the gain selected by the user will
> > > be override to do a ramp => volume_ramp(.....):
> > > - When you switch on the HP, you start from gain=-40db to final_gain
> > > (selected by user).
> > > - When you switch off the HP, you start from final_gain (selected by user)
> > > to gain=-40db.

> > You can just read the value back when you need to do a ramp?

> You can't. Because you will read -40db when HP isn't playing sound. That is
> why the gain is saved into the struct.

> Let me know, when you change de gain to do a ramp down (start from user gain
> to gain=-40db), next time for the ramp up, how/where do you find the user
> gain ?

In the register.  You only need to reset the gain to -40dB at the start
of the ramp.

> > > Also, the microphone's gain change when it's enabled/disabled.

> > I don't understand what this means?

> When microphone isn't capturing, the gain read back from the register is
> 0dB. I've put some logs in my code and do capture to show how it works:

Is this a property of the hardware or a property of your driver?

> > > > > +	/* ul channel swap */
> > > > > +	SOC_SINGLE("UL LR Swap", MT6357_AFE_UL_DL_CON0, AFE_UL_LR_SWAP_SFT, 1, 0),

> > > > On/off controls should end in Switch.

> > > Sorry, I don't understand your comment. Can you reword it please ?

> > See control-names.rst.  Run mixer-test on a card with this driver and
> > fix all the issues it reports.

> Ok the name is the issue for you AFAII.
> This control isn't for on/off but swap Left and Right.
> From the codec documentation:
> "Swaps audio UL L/R channel before UL SRC"
> This control is overkill, I will remove it

This is turning the swapping on and off.
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