linux-kernel - Re: [PATCH v1] mmc: via-sdmmc: use generic power management

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Message-ID: <CAPDyKFpHxf7xWOy+-qX+DQVtufbD50_imfi51TtsEp6P=iGs7g@mail.gmail.com>
Date:   Wed, 5 Aug 2020 08:34:04 +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>,
        Bruce Chang <brucechang@....com.tw>,
        Harald Welte <HaraldWelte@...tech.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v1] mmc: via-sdmmc: use generic power management

On Mon, 20 Jul 2020 at 16:28, 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_enable_wake() and pci_set_power_state() and 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 dev_get_drvdata() to get drv data.
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>

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


> ---
>  drivers/mmc/host/via-sdmmc.c | 33 ++++++++-------------------------
>  1 file changed, 8 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c
> index ef95bce50889..49dab9f42b6d 100644
> --- a/drivers/mmc/host/via-sdmmc.c
> +++ b/drivers/mmc/host/via-sdmmc.c
> @@ -1220,9 +1220,7 @@ static void via_sd_remove(struct pci_dev *pcidev)
>                 pci_name(pcidev), (int)pcidev->vendor, (int)pcidev->device);
>  }
>
> -#ifdef CONFIG_PM
> -
> -static void via_init_sdc_pm(struct via_crdr_mmc_host *host)
> +static void __maybe_unused via_init_sdc_pm(struct via_crdr_mmc_host *host)
>  {
>         struct sdhcreg *pm_sdhcreg;
>         void __iomem *addrbase;
> @@ -1256,30 +1254,27 @@ static void via_init_sdc_pm(struct via_crdr_mmc_host *host)
>         via_print_sdchc(host);
>  }
>
> -static int via_sd_suspend(struct pci_dev *pcidev, pm_message_t state)
> +static int __maybe_unused via_sd_suspend(struct device *dev)
>  {
>         struct via_crdr_mmc_host *host;
>
> -       host = pci_get_drvdata(pcidev);
> +       host = dev_get_drvdata(dev);
>
>         via_save_pcictrlreg(host);
>         via_save_sdcreg(host);
>
> -       pci_save_state(pcidev);
> -       pci_enable_wake(pcidev, pci_choose_state(pcidev, state), 0);
> -       pci_disable_device(pcidev);
> -       pci_set_power_state(pcidev, pci_choose_state(pcidev, state));
> +       device_wakeup_enable(dev);
>
>         return 0;
>  }
>
> -static int via_sd_resume(struct pci_dev *pcidev)
> +static int __maybe_unused via_sd_resume(struct device *dev)
>  {
>         struct via_crdr_mmc_host *sdhost;
>         int ret = 0;
>         u8 gatt;
>
> -       sdhost = pci_get_drvdata(pcidev);
> +       sdhost = dev_get_drvdata(dev);
>
>         gatt = VIA_CRDR_PCICLKGATT_PAD_PWRON;
>         if (sdhost->power == MMC_VDD_165_195)
> @@ -1294,32 +1289,20 @@ static int via_sd_resume(struct pci_dev *pcidev)
>
>         msleep(100);
>
> -       pci_set_power_state(pcidev, PCI_D0);
> -       pci_restore_state(pcidev);
> -       ret = pci_enable_device(pcidev);
> -       if (ret)
> -               return ret;
> -
>         via_restore_pcictrlreg(sdhost);
>         via_init_sdc_pm(sdhost);
>
>         return ret;
>  }
>
> -#else /* CONFIG_PM */
> -
> -#define via_sd_suspend NULL
> -#define via_sd_resume NULL
> -
> -#endif /* CONFIG_PM */
> +static SIMPLE_DEV_PM_OPS(via_sd_pm_ops, via_sd_suspend, via_sd_resume);
>
>  static struct pci_driver via_sd_driver = {
>         .name = DRV_NAME,
>         .id_table = via_ids,
>         .probe = via_sd_probe,
>         .remove = via_sd_remove,
> -       .suspend = via_sd_suspend,
> -       .resume = via_sd_resume,
> +       .driver.pm = &via_sd_pm_ops,
>  };
>
>  module_pci_driver(via_sd_driver);
> --
> 2.27.0
>