linux-kernel - Re: [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in dwcmshc

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Message-ID: <CAPDyKFrFA2vMbP6Nxt9egxK8-Mk9Td9+Cz73tNEF8mQpQJ_DPA@mail.gmail.com>
Date: Mon, 25 Mar 2024 14:19:00 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Liming Sun <limings@...dia.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>, David Thompson <davthompson@...dia.com>, 
	Shawn Lin <shawn.lin@...k-chips.com>, linux-mmc@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in dwcmshc_remove()

On Tue, 19 Mar 2024 at 17:16, Liming Sun <limings@...dia.com> wrote:
>
> This commit disables PM runtime in dwcmshc_remove() to avoid the
> error message below when reloading the sdhci-of-dwcmshc.ko
>
>   sdhci-dwcmshc MLNXBF30:00: Unbalanced pm_runtime_enable!
>
> Fixes: 48fe8fadbe5e ("mmc: sdhci-of-dwcmshc: Add runtime PM operations")
> Reviewed-by: David Thompson <davthompson@...dia.com>
> Signed-off-by: Liming Sun <limings@...dia.com>

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index ab4b964d4058..1d8f5a76096a 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -999,6 +999,17 @@ static int dwcmshc_probe(struct platform_device *pdev)
>         return err;
>  }
>
> +static void dwcmshc_disable_card_clk(struct sdhci_host *host)
> +{
> +       u16 ctrl;
> +
> +       ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +       if (ctrl & SDHCI_CLOCK_CARD_EN) {
> +               ctrl &= ~SDHCI_CLOCK_CARD_EN;
> +               sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> +       }
> +}
> +
>  static void dwcmshc_remove(struct platform_device *pdev)
>  {
>         struct sdhci_host *host = platform_get_drvdata(pdev);
> @@ -1006,8 +1017,14 @@ static void dwcmshc_remove(struct platform_device *pdev)
>         struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
>         struct rk35xx_priv *rk_priv = priv->priv;
>
> +       pm_runtime_get_sync(&pdev->dev);
> +       pm_runtime_disable(&pdev->dev);
> +       pm_runtime_put_noidle(&pdev->dev);
> +
>         sdhci_remove_host(host, 0);
>
> +       dwcmshc_disable_card_clk(host);
> +
>         clk_disable_unprepare(pltfm_host->clk);
>         clk_disable_unprepare(priv->bus_clk);
>         if (rk_priv)
> @@ -1099,17 +1116,6 @@ static void dwcmshc_enable_card_clk(struct sdhci_host *host)
>         }
>  }
>
> -static void dwcmshc_disable_card_clk(struct sdhci_host *host)
> -{
> -       u16 ctrl;
> -
> -       ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> -       if (ctrl & SDHCI_CLOCK_CARD_EN) {
> -               ctrl &= ~SDHCI_CLOCK_CARD_EN;
> -               sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> -       }
> -}
> -
>  static int dwcmshc_runtime_suspend(struct device *dev)
>  {
>         struct sdhci_host *host = dev_get_drvdata(dev);
> --
> 2.30.1
>