linux-kernel - Re: [PATCH] mmc: sdhci-pxav3: don't disable clocks when we might get an interrupt

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Date:   Tue, 15 May 2018 08:59:30 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Thomas Hebb <tommyhebb@...il.com>, linux-kernel@...r.kernel.org
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        "open list:SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI...)" 
        <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-pxav3: don't disable clocks when we might get
 an interrupt

On 15/05/18 00:56, Thomas Hebb wrote:
> Currently, runtime_suspend() unconditionally disables the clock gates
> for the controller, which means that it's unable to receive interrupts
> generated by connected SDIO cards.

We currently get / put runtime pm with enable / disable of the SDIO IRQ
(refer sdhci_enable_sdio_irq()) so are you sure this is needed?

> 
> Signed-off-by: Thomas Hebb <tommyhebb@...il.com>
> ---
>  drivers/mmc/host/sdhci-pxav3.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index a34434166ca7..59760f3cc1d7 100644
> --- a/drivers/mmc/host/sdhci-pxav3.c
> +++ b/drivers/mmc/host/sdhci-pxav3.c
> @@ -562,9 +562,11 @@ static int sdhci_pxav3_runtime_suspend(struct device *dev)
>  	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
>  		mmc_retune_needed(host->mmc);
>  
> -	clk_disable_unprepare(pxa->clk_io);
> -	if (!IS_ERR(pxa->clk_core))
> -		clk_disable_unprepare(pxa->clk_core);
> +	if (!sdhci_sdio_irq_enabled(host)) {
> +		clk_disable_unprepare(pxa->clk_io);
> +		if (!IS_ERR(pxa->clk_core))
> +			clk_disable_unprepare(pxa->clk_core);
> +	}
>  
>  	return 0;
>  }
> @@ -575,9 +577,11 @@ static int sdhci_pxav3_runtime_resume(struct device *dev)
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host);
>  
> -	clk_prepare_enable(pxa->clk_io);
> -	if (!IS_ERR(pxa->clk_core))
> -		clk_prepare_enable(pxa->clk_core);
> +	if (!sdhci_sdio_irq_enabled(host)) {
> +		clk_prepare_enable(pxa->clk_io);
> +		if (!IS_ERR(pxa->clk_core))
> +			clk_prepare_enable(pxa->clk_core);
> +	}
>  
>  	return sdhci_runtime_resume_host(host);
>  }
>