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

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Message-ID: <0d31ffb2-9df5-4c3e-a728-902b71a1a713@sirena.org.uk>
Date: Fri, 15 Mar 2024 14:30:02 +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 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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