linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: acer-aspire1: Correct audio codec definition

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Message-ID: <66fa9aff9a7c4b3bbd980f90aed5a62e@trvn.ru>
Date:   Tue, 31 Oct 2023 15:48:14 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     cros-qcom-dts-watchers@...omium.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] arm64: dts: qcom: acer-aspire1: Correct audio codec
 definition

Konrad Dybcio писал(а) 31.10.2023 15:06:
> On 31.10.2023 08:20, Nikita Travkin wrote:
>> Konrad Dybcio писал(а) 31.10.2023 02:48:
>>> On 27.10.2023 16:42, Nikita Travkin wrote:
>>>> When initially added, a mistake was made in the definition of the codec.
>>>>
>>>> Despite the fact that the DMIC line is connected on the side of the
>>>> codec chip, and relevant passive components, including 0-ohm resistors
>>>> connecting the dmics, are present, the dmic line is still cut in
>>>> another place on the board, which was overlooked.
>>>>
>>>> Correct this by replacing the dmic configuration with a comment
>>>> describing this hardware detail.
>>>>
>>>> While at it, also add missing regulators definitions. This is not a
>>>> functional change as all the relevant regulators were already added via
>>>> the other rail supplies.
>>>>
>>>> Fixes: 4a9f8f8f2ada ("arm64: dts: qcom: Add Acer Aspire 1")
>>>> Signed-off-by: Nikita Travkin <nikita@...n.ru>
>>>> ---
>>>>  arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts | 17 +++++++++++++++--
>>>>  1 file changed, 15 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts b/arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts
>>>> index cfde8cd47107..00b442696618 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts
>>>> +++ b/arch/arm64/boot/dts/qcom/sc7180-acer-aspire1.dts
>>>> @@ -209,9 +209,22 @@ alc5682: codec@1a {
>>>>  		AVDD-supply = <&vreg_l15a_1p8>;
>>>>  		MICVDD-supply = <&reg_codec_3p3>;
>>>>  		VBAT-supply = <&reg_codec_3p3>;
>>>> +		DBVDD-supply = <&vreg_l15a_1p8>;
>>>> +		LDO1-IN-supply = <&vreg_l15a_1p8>;
>>>> +
>>>> +		/*
>>>> +		 * NOTE: The board has a path from this codec to the
>>>> +		 * DMIC microphones in the lid, however some of the option
>>>> +		 * resistors are absent and the microphones are connected
>>>> +		 * to the SoC instead.
>>> Would that not also require more DT changes and maybe UCM?
>>
>> I don't think I had any other descriptions to support the dmic in
>> the initial set (first audio support for this board is 3/3 here)
>> and there is no upstream UCM yet - I will probably hold it off until
>> I get vamacro and dmic on it working.
> I was told that VAMACRO is "the easiest thing possible to get going"
> (paraphrasing), did you go through something like this sequence [1]?
> 

The problem is that no one introduced it for sc7180 - it's not
in the dtsi. And so isn't the lpass-tlmm I'd need...

So the set of due changes per my understanding is like:

 - Add va-macro to sc7180 (need new compatible/fallback)
 - Add relevant clocks for it (seems to be firmware backed, so easy?)
 - Add lpass-tlmm (it seems like we add a new driver for each soc
   even if they are same? Are they same?)
 - Add va macro dma dais to the asoc boardfile (trivial)
 - Finally, add the dmic to the board dts and enable in the UCM
   (also trivial)

So I decided to follow the "release early, release often" and
only introduce partial sound for now, following it up with
all above later.

> https://git.linaro.org/people/srinivas.kandagatla/alsa-ucm-conf.git/tree/ucm2/codecs/qcom-lpass/va-macro/DMIC0EnableSeq.conf?h=x13s&id=244979b03f5b9284e6a68eae6f9995f6ac735be8

Thanks, this is useful to have, I was indeed looking at
x13s for dmic/vamacro example after I realized my board
tricked me and it's not how trogdor does it...

Nikita