linux-kernel - Re: [PATCH 2/2] mmc: sdhci-of-at91: set clocks and presets after resume from deepest PM

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Date:   Tue, 20 Jun 2017 08:33:29 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
CC:     <adrian.hunter@...el.com>, <ludovic.desroches@...rochip.com>,
        <ulf.hansson@...aro.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <thomas.petazzoni@...e-electrons.com>,
        <alexandre.belloni@...e-electrons.com>,
        <nicolas.ferre@...rochip.com>
Subject: Re: [PATCH 2/2] mmc: sdhci-of-at91: set clocks and presets after
 resume from deepest PM

On Fri, Jun 16, 2017 at 09:29:29AM +0200, Quentin Schulz wrote:
> This adds deepest (Backup+Self-Refresh) PM support to the ATMEL SAMA5D2
> SoC's SDHCI controller.
> 
> When resuming from deepest state, it is required to restore preset
> registers as the registers are lost since VDD core has been shut down
> when entering deepest state on the SAMA5D2. The clocks need to be
> reconfigured as well.
> 
> The other registers and init process are taken care of by the SDHCI
> core.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> ---
>  drivers/mmc/host/sdhci-of-at91.c | 34 ++++++++++++++++++++++++++++++++--
>  1 file changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index fb8c6011f13d..300513fc1068 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -207,6 +207,37 @@ static int sdhci_at91_set_clks_presets(struct device *dev)
>  }
>  
>  #ifdef CONFIG_PM
> +static int sdhci_at91_suspend(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host);
> +	int ret;
> +
> +	ret = sdhci_suspend_host(host);
> +
> +	if (host->runtime_suspended)
> +		return ret;
> +
> +	clk_disable_unprepare(priv->gck);
> +	clk_disable_unprepare(priv->hclock);
> +	clk_disable_unprepare(priv->mainck);
> +
> +	return ret;
> +}
> +
> +static int sdhci_at91_resume(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = sdhci_at91_set_clks_presets(dev);
> +	if (ret)
> +		return ret;
> +
> +	return sdhci_resume_host(host);
> +}
> +
>  static int sdhci_at91_runtime_suspend(struct device *dev)
>  {
>  	struct sdhci_host *host = dev_get_drvdata(dev);
> @@ -256,8 +287,7 @@ static int sdhci_at91_runtime_resume(struct device *dev)
>  #endif /* CONFIG_PM */
>  
>  static const struct dev_pm_ops sdhci_at91_dev_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> -				pm_runtime_force_resume)
> +	SET_SYSTEM_SLEEP_PM_OPS(sdhci_at91_suspend, sdhci_at91_resume)
>  	SET_RUNTIME_PM_OPS(sdhci_at91_runtime_suspend,
>  			   sdhci_at91_runtime_resume,
>  			   NULL)
> -- 
> 2.11.0
> 
> --
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