linux-kernel - Re: [PATCH v1] memstick: jmb38x_ms: use generic power management

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Message-ID: <CAPDyKFo_skSjZ0gfLNNgx2rdDDu3gTJ4Lc+40t=Jb1KPoBBaiA@mail.gmail.com>
Date:   Wed, 5 Aug 2020 08:33:55 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Vaibhav Gupta <vaibhavgupta40@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Maxim Levitsky <maximlevitsky@...il.com>,
        Alex Dubov <oakad@...oo.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v1] memstick: jmb38x_ms: use generic power management

On Mon, 20 Jul 2020 at 13:19, Vaibhav Gupta <vaibhavgupta40@...il.com> wrote:
>
> Drivers using legacy PM have to manage PCI states and device's PM states
> themselves. They also need to take care of configuration registers.
>
> With improved and powerful support of generic PM, PCI Core takes care of
> above mentioned, device-independent, jobs.
>
> This driver makes use of PCI helper functions like
> pci_save/restore_state(), pci_enable/disable_device(),
> pci_set_power_state() and pci_set_master() to do required operations. In
> generic mode, they are no longer needed.
>
> Change function parameter in both .suspend() and .resume() to
> "struct device*" type. Use to_pci_dev() and dev_get_drvdata() to get
> "struct pci_dev*" variable and drv data.
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>

Applied for next (a while ago), thanks!
Kind regards
Uffe


> ---
>  drivers/memstick/host/jmb38x_ms.c | 38 +++++++++----------------------
>  1 file changed, 11 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
> index 0a9c5ddf2f59..2aa9592917d9 100644
> --- a/drivers/memstick/host/jmb38x_ms.c
> +++ b/drivers/memstick/host/jmb38x_ms.c
> @@ -793,11 +793,10 @@ static int jmb38x_ms_pmos(struct pci_dev *pdev, int flag)
>          return 0;
>  }
>
> -#ifdef CONFIG_PM
> -
> -static int jmb38x_ms_suspend(struct pci_dev *dev, pm_message_t state)
> +static int __maybe_unused jmb38x_ms_suspend(struct device *dev)
>  {
> -       struct jmb38x_ms *jm = pci_get_drvdata(dev);
> +       struct jmb38x_ms *jm = dev_get_drvdata(dev);
> +
>         int cnt;
>
>         for (cnt = 0; cnt < jm->host_cnt; ++cnt) {
> @@ -806,26 +805,17 @@ static int jmb38x_ms_suspend(struct pci_dev *dev, pm_message_t state)
>                 memstick_suspend_host(jm->hosts[cnt]);
>         }
>
> -       pci_save_state(dev);
> -       pci_enable_wake(dev, pci_choose_state(dev, state), 0);
> -       pci_disable_device(dev);
> -       pci_set_power_state(dev, pci_choose_state(dev, state));
> +       device_wakeup_disable(dev);
> +
>         return 0;
>  }
>
> -static int jmb38x_ms_resume(struct pci_dev *dev)
> +static int __maybe_unused jmb38x_ms_resume(struct device *dev)
>  {
> -       struct jmb38x_ms *jm = pci_get_drvdata(dev);
> +       struct jmb38x_ms *jm = dev_get_drvdata(dev);
>         int rc;
>
> -       pci_set_power_state(dev, PCI_D0);
> -       pci_restore_state(dev);
> -       rc = pci_enable_device(dev);
> -       if (rc)
> -               return rc;
> -       pci_set_master(dev);
> -
> -       jmb38x_ms_pmos(dev, 1);
> +       jmb38x_ms_pmos(to_pci_dev(dev), 1);
>
>         for (rc = 0; rc < jm->host_cnt; ++rc) {
>                 if (!jm->hosts[rc])
> @@ -837,13 +827,6 @@ static int jmb38x_ms_resume(struct pci_dev *dev)
>         return 0;
>  }
>
> -#else
> -
> -#define jmb38x_ms_suspend NULL
> -#define jmb38x_ms_resume NULL
> -
> -#endif /* CONFIG_PM */
> -
>  static int jmb38x_ms_count_slots(struct pci_dev *pdev)
>  {
>         int cnt, rc = 0;
> @@ -1030,13 +1013,14 @@ static struct pci_device_id jmb38x_ms_id_tbl [] = {
>         { }
>  };
>
> +static SIMPLE_DEV_PM_OPS(jmb38x_ms_pm_ops, jmb38x_ms_suspend, jmb38x_ms_resume);
> +
>  static struct pci_driver jmb38x_ms_driver = {
>         .name = DRIVER_NAME,
>         .id_table = jmb38x_ms_id_tbl,
>         .probe = jmb38x_ms_probe,
>         .remove = jmb38x_ms_remove,
> -       .suspend = jmb38x_ms_suspend,
> -       .resume = jmb38x_ms_resume
> +       .driver.pm = &jmb38x_ms_pm_ops,
>  };
>
>  module_pci_driver(jmb38x_ms_driver);
> --
> 2.27.0
>