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

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Date:	Fri, 15 Aug 2014 13:49:17 +0100
From:	Ian Molton <ian.molton@...ethink.co.uk>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: tmio: Fix hang during suspend

On Thu, 14 Aug 2014 17:23:53 +0200
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 feels wrong. Why can't interrupts be disabled prior to turning the clock off?

-Ian

> This fixes suspend and resume on r8a7791/koelsch.
> 
> 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
> 


-- 
Ian Molton <ian.molton@...ethink.co.uk>
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