linux-kernel - Re: [PATCH] mfd: sprd: Add wakeup capability for PMIC irq

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Message-ID: <CAAfSe-s6Tp=4QQzU-=YSL9R5LkqAZVQTsWCiQgkgNmyDuM366Q@mail.gmail.com>
Date:   Mon, 25 May 2020 16:06:09 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Orson Zhai <orsonzhai@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: sprd: Add wakeup capability for PMIC irq

On Thu, 7 May 2020 at 14:40, Baolin Wang <baolin.wang7@...il.com> wrote:
>
> When changing to use suspend-to-idle to save power, the PMIC irq can not
> wakeup the system due to lack of wakeup capability, which will cause
> the sub-irqs (such as power key) of the PMIC can not wake up the system.
> Thus we can add the wakeup capability for PMIC irq to solve this issue,
> as well as removing the IRQF_NO_SUSPEND flag to allow PMIC irq to be
> a wakeup source.
>
> Reported-by: Chunyan Zhang <zhang.lyra@...il.com>
> Signed-off-by: Baolin Wang <baolin.wang7@...il.com>

Thanks for fixing this issue, with this patch, power key can wakeup
s2idle correctly on my sprd board.

Tested-by: Chunyan Zhang <chunyan.zhang@...soc.com>

> ---
>  drivers/mfd/sprd-sc27xx-spi.c | 30 +++++++++++++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
> index ebdf2f1..3064a60 100644
> --- a/drivers/mfd/sprd-sc27xx-spi.c
> +++ b/drivers/mfd/sprd-sc27xx-spi.c
> @@ -256,7 +256,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
>         }
>
>         ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
> -                                      IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
> +                                      IRQF_ONESHOT, 0,
>                                        &ddata->irq_chip, &ddata->irq_data);
>         if (ret) {
>                 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
> @@ -272,9 +272,36 @@ static int sprd_pmic_probe(struct spi_device *spi)
>                 return ret;
>         }
>
> +       device_init_wakeup(&spi->dev, 1);
>         return 0;
>  }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int sprd_pmic_suspend(struct device *dev)
> +{
> +       struct spi_device *spi = to_spi_device(dev);
> +       struct sprd_pmic *ddata = spi_get_drvdata(spi);
> +
> +       if (device_may_wakeup(dev))
> +               enable_irq_wake(ddata->irq);
> +
> +       return 0;
> +}
> +
> +static int sprd_pmic_resume(struct device *dev)
> +{
> +       struct spi_device *spi = to_spi_device(dev);
> +       struct sprd_pmic *ddata = spi_get_drvdata(spi);
> +
> +       if (device_may_wakeup(dev))
> +               disable_irq_wake(ddata->irq);
> +
> +       return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
> +
>  static const struct of_device_id sprd_pmic_match[] = {
>         { .compatible = "sprd,sc2731", .data = &sc2731_data },
>         {},
> @@ -286,6 +313,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
>                 .name = "sc27xx-pmic",
>                 .bus = &spi_bus_type,
>                 .of_match_table = sprd_pmic_match,
> +               .pm = &sprd_pmic_pm_ops,
>         },
>         .probe = sprd_pmic_probe,
>  };
> --
> 1.9.1
>