linux-kernel - Re: [PATCH] mmc: tmio: Fix hang during suspend

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Date:	Fri, 15 Aug 2014 16:42:33 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Ian Molton <ian.molton@...ethink.co.uk>,
	Chris Ball <chris@...ntf.net>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: tmio: Fix hang during suspend

On 14 August 2014 17:23, Geert Uytterhoeven <geert+renesas@...der.be> wrote:
> On R-Car Gen 2, the SDHI registers cannot be accessed while the SDHI
> module clock is disabled. Doing so will cause a lock-up.
>
> When suspending, enable the module clock before disabling the SDHI
> interrupts, and disable the clock again afterwards.
>
> This fixes suspend and resume on r8a7791/koelsch.

Out of curiosity, are you using CONFIG_PM_RUNTIME to trigger this bug?

Kind regards
Uffe

>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/mmc/host/tmio_mmc_pio.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
> index faf0924e71cb..83192420a7e3 100644
> --- a/drivers/mmc/host/tmio_mmc_pio.c
> +++ b/drivers/mmc/host/tmio_mmc_pio.c
> @@ -1147,8 +1147,18 @@ int tmio_mmc_host_suspend(struct device *dev)
>  {
>         struct mmc_host *mmc = dev_get_drvdata(dev);
>         struct tmio_mmc_host *host = mmc_priv(mmc);
> +       struct tmio_mmc_data *pdata = host->pdata;
> +
> +       if (pdata->clk_enable) {
> +               unsigned int f;
> +               pdata->clk_enable(host->pdev, &f);
> +       }
>
>         tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
> +
> +       if (pdata->clk_disable)
> +               pdata->clk_disable(host->pdev);
> +
>         return 0;
>  }
>  EXPORT_SYMBOL(tmio_mmc_host_suspend);
> --
> 1.9.1
>
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