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

[Mark Brown <broonie@kernel.org>]

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On Tue, Mar 12, 2024 at 07:03:25PM +0100, Alexandre Mergnat wrote:
> On 26/02/2024 17:09, Mark Brown wrote:

> > > +	case MT6357_ZCD_CON2:
> > > +		regmap_read(priv->regmap, MT6357_ZCD_CON2, &reg);
> > > +		priv->ana_gain[ANALOG_VOLUME_HPOUTL] =
> > > +			(reg & AUD_HPL_GAIN_MASK) >> AUD_HPL_GAIN_SFT;
> > > +		priv->ana_gain[ANALOG_VOLUME_HPOUTR] =
> > > +			(reg & AUD_HPR_GAIN_MASK) >> AUD_HPR_GAIN_SFT;
> > > +		break;

> > It would probably be less code and would definitely be clearer and
> > simpler to just read the values when we need them rather than constatly
> > keeping a cache separate to the register cache.

> 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?

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

I don't understand what this means?

> > > +	/* 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.

> > > +static int hslo_mux_map_value[] = {
> > > +	0x0, 0x1, 0x2, 0x3,
> > > +};

> > Why not just use a normal mux here, there's no missing values or
> > reordering?  Similarly for other muxes.

> I've dug into some other codecs and it's done like that, but I've probably
> misunderstood something.

> The only bad thing I see is enum is missing currently:
> 
> enum {
> 	PGA_MUX_OPEN = 0,
> 	PGA_MUX_DACR,
> 	PGA_MUX_PB,
> 	PGA_MUX_TM,
> 	PGA_MUX_MASK = 0x3,
> };

The whole thing with explicitly specfying the mapping is just completely
redundant, you may as well remove it.

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