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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 29 Nov 2022 08:53:34 +0100
Message-ID: <CAMuHMdUBojHkaAPsjOEadfaikth+L0R_NrKzvqXrmZS9Kc5zHw@mail.gmail.com>
Subject: Re: [PATCH] ASoC: qcom: lpass-sc7180: Add system suspend/resume PM ops
To:     Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Cc:     agross@kernel.org, andersson@kernel.org, lgirdwood@gmail.com,
        broonie@kernel.org, robh+dt@kernel.org, quic_plai@quicinc.com,
        bgoswami@quicinc.com, perex@perex.cz, tiwai@suse.com,
        srinivas.kandagatla@linaro.org, quic_rohkumar@quicinc.com,
        linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org, swboyd@chromium.org,
        judyhsiao@chromium.org, devicetree@vger.kernel.org
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Hi Srinivasa,

On Mon, Nov 28, 2022 at 8:50 AM Srinivasa Rao Mandadapu
<quic_srivasam@quicinc.com> wrote:
> 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@quicinc.com>
> Tested-by: Rahul Ajmeriya <quic_rajmeriy@quicinc.com>

Thanks for your patch, which is now commit 2d68148f8f85ca5a ("ASoC:
qcom: lpass-sc7180: Add system suspend/resume PM ops") in next-20221129.

> --- 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>
>  #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;
> +       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;
> +}
> +
> +static int sc7180_lpass_dev_suspend(struct device *dev)
> +{
> +       struct lpass_data *drvdata = dev_get_drvdata(dev);
> +
> +       clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
>         return 0;
>  }

noreply@ellerman.id.au reports for e.g. m68k-allmodconfig:

    sound/soc/qcom/lpass-sc7180.c:179:12: error:
'sc7180_lpass_dev_suspend' defined but not used
[-Werror=unused-function]
    sound/soc/qcom/lpass-sc7180.c:166:12: error:
'sc7180_lpass_dev_resume' defined but not used
[-Werror=unused-function]

>
> +static const struct dev_pm_ops sc7180_lpass_pm_ops = {
> +       SET_SYSTEM_SLEEP_PM_OPS(sc7180_lpass_dev_suspend, sc7180_lpass_dev_resume)
> +};

Please use DEFINE_SIMPLE_DEV_PM_OPS()...

> +
>  static struct lpass_variant sc7180_data = {
>         .i2sctrl_reg_base       = 0x1000,
>         .i2sctrl_reg_stride     = 0x1000,
> @@ -293,6 +318,7 @@ static struct platform_driver sc7180_lpass_cpu_platform_driver = {
>         .driver = {
>                 .name = "sc7180-lpass-cpu",
>                 .of_match_table = of_match_ptr(sc7180_lpass_cpu_device_id),
> +               .pm = &sc7180_lpass_pm_ops,

... and pm_sleep_ptr().

>         },
>         .probe = asoc_qcom_lpass_cpu_platform_probe,
>         .remove = asoc_qcom_lpass_cpu_platform_remove,

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds