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

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Date:   Tue, 29 Nov 2022 16:05:41 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <robh+dt@...nel.org>,
        <quic_plai@...cinc.com>, <bgoswami@...cinc.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <srinivas.kandagatla@...aro.org>,
        <quic_rohkumar@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <swboyd@...omium.org>, <judyhsiao@...omium.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH] ASoC: qcom: lpass-sc7180: Add system suspend/resume PM
 ops

Hi Geert,

Thanks for your time!!!

On 11/29/2022 1:23 PM, Geert Uytterhoeven wrote:
> Hi Srinivasa,
>
> On Mon, Nov 28, 2022 at 8:50 AM Srinivasa Rao Mandadapu
> <quic_srivasam@...cinc.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@...cinc.com>
>> Tested-by: Rahul Ajmeriya <quic_rajmeriy@...cinc.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@...erman.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()...
Actually, we need to use this patch in in previous kernels 5.4 and 5.15.
I think these changes won't apply on previous kernel.
Hence ignoring for now and will take care next time.
>
>> +
>>   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@...ux-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