linux-kernel - Re: [PATCH v2] ASoC: qcom: soundwire: Add support for controlling audio CGCR from HLOS

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Date:   Wed, 1 Jun 2022 14:42:30 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        alsa-devel@...a-project.org, bgoswami@...cinc.com,
        bjorn.andersson@...aro.org, broonie@...nel.org,
        devicetree@...r.kernel.org, judyhsiao@...omium.org,
        lgirdwood@...il.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, perex@...ex.cz,
        quic_plai@...cinc.com, quic_rohkumar@...cinc.com,
        robh+dt@...nel.org, tiwai@...e.com, vkoul@...nel.org
Subject: Re: [PATCH v2] ASoC: qcom: soundwire: Add support for controlling
 audio CGCR from HLOS



On 01/06/2022 14:15, Srinivasa Rao Mandadapu wrote:
>>>>>>> +       ctrl->audio_cgcr = devm_reset_control_get_exclusive(dev, 
>>>>>>> "swr_audio_cgcr");
>>>>>>> +       if (IS_ERR(ctrl->audio_cgcr))
>>>>>>> +               dev_err(dev, "Failed to get audio_cgcr reset 
>>>>>>> required for soundwire-v1.6.0\n");
>>>>>> Why is there no return on error here? Is the reset optional?
>>>>> Yes it's optional. For older platforms this is not required.
>>>> If it's optional then either there should be no error message, or the
>>>> error message should only be logged when the version is >= 1.6.0. There
>>>> are few things worse than a kernel log riddled with misleading error
>>>> messages.
>>>
>>> In that case, it can be done like below. Kindly let me know your 
>>> opinion on this.
>>>
>>> if (ctrl->version >= 0x01060000) {
>>
>> This is not true 1.7+ variants do not require anything as such.
> 
> I think it applies for all upcoming versions as Qualcomm Hardware team. 
> Here is the not from HW Team.

Am testing sm8450 which has 1.7.0 and it does not require/have such control.

I dont understand what is the issue in adding a flag to
struct qcom_swrm_data.

This should give finer control rather than matching anything > 1.6.


--srini
>