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 09:55:09 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        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 Wed, Jun 01, 2022 at 02:42:30PM +0100, Srinivas Kandagatla wrote:
> 
> 
> 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.

I agree, a flag seems a suitable option.