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

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Date: Wed, 13 Mar 2024 17:23:19 +0000
From: Mark Brown <broonie@...nel.org>
To: Alexandre Mergnat <amergnat@...libre.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Lee Jones <lee@...nel.org>, Flora Fu <flora.fu@...iatek.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	Nicolas Belin <nbelin@...libre.com>
Subject: Re: [PATCH 12/18] ASoC: codecs: mt6357: add MT6357 codec

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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