linux-kernel - Re: [PATCH] ASoC: qcom: lpass-sc7180: Add system suspend/resume PM ops

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Date:   Mon, 28 Nov 2022 14:40:10 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        agross@...nel.org, alsa-devel@...a-project.org,
        andersson@...nel.org, bgoswami@...cinc.com, 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
Subject: Re: [PATCH] ASoC: qcom: lpass-sc7180: Add system suspend/resume PM ops

Quoting Srinivasa Rao Mandadapu (2022-11-27 23:49:02)
> Update lpass sc7180 platform driver with PM ops, such as
> system supend and resume callbacks.
> This update is required to disable clocks during supend and
> avoid XO shutdown issue.
>
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> Tested-by: Rahul Ajmeriya <quic_rajmeriy@...cinc.com>
> ---
>  sound/soc/qcom/lpass-sc7180.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/sound/soc/qcom/lpass-sc7180.c b/sound/soc/qcom/lpass-sc7180.c
> index 77a556b..6ad1c5b 100644
> --- a/sound/soc/qcom/lpass-sc7180.c
> +++ b/sound/soc/qcom/lpass-sc7180.c
> @@ -12,6 +12,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>

Why is this include needed? Did you mean to include linux/pm.h?

>  #include <dt-bindings/sound/sc7180-lpass.h>
>  #include <sound/pcm.h>
>  #include <sound/soc.h>
> @@ -156,10 +157,34 @@ static int sc7180_lpass_exit(struct platform_device *pdev)
>         struct lpass_data *drvdata = platform_get_drvdata(pdev);
>
>         clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
> +       return 0;
> +}
> +
> +static int sc7180_lpass_dev_resume(struct device *dev)
> +{
> +       int ret = 0;

Please don't assign ret and then assign it again. It hides use before
true assignment bugs.

> +       struct lpass_data *drvdata = dev_get_drvdata(dev);
>
> +       ret = clk_bulk_prepare_enable(drvdata->num_clks, drvdata->clks);
> +       if (ret) {
> +               dev_err(dev, "sc7180 clk prepare and enable failed\n");
> +               return ret;
> +       }
> +       return ret;

This could be simplified to

	ret = clk_bulk_prepare_enable(...);
	if (ret)
		dev_err(dev, ...);

	return ret;