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 18:27:18 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     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>, <srinivas.kandagatla@...aro.org>,
        <tiwai@...e.com>, <vkoul@...nel.org>
Subject: Re: [PATCH v2] ASoC: qcom: soundwire: Add support for controlling
 audio CGCR from HLOS


On 6/1/2022 4:02 AM, Matthias Kaehlcke wrote:
Thanks for Your Time Matthias!!!
> On Tue, May 24, 2022 at 04:19:47PM +0530, Srinivasa Rao Mandadapu wrote:
>> On 5/21/2022 8:43 AM, Stephen Boyd wrote:
>> Thanks for your time Stephen!!!
>>> Quoting Srinivasa Rao Mandadapu (2022-05-18 05:42:35)
>>>> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
>>>> index da1ad7e..445e481 100644
>>>> --- a/drivers/soundwire/qcom.c
>>>> +++ b/drivers/soundwire/qcom.c
>>>> @@ -1333,6 +1337,10 @@ static int qcom_swrm_probe(struct platform_device *pdev)
>>>>           ctrl->bus.compute_params = &qcom_swrm_compute_params;
>>>>           ctrl->bus.clk_stop_timeout = 300;
>>>>
>>>> +       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) {
     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");
             ret = PTR_ERR(ctrl->audio_cgcr);
             goto err_clk;
         }
     }