Re: [PATCH v3] mmc: sdhci-xenon: Add Xenon SDHCI specific system-level PM support

[Adrian Hunter <adrian.hunter@intel.com>]

On 13/07/17 01:16, Zhoujie Wu wrote:
> From: Hu Ziji <huziji@marvell.com>
> 
> Add Xenon specific system-level suspend and resume support.
> Especially during resume, re-configure Xenon specific registers
> since registers setting will be lost in suspend if Xenon is power off.
> 
> Signed-off-by: Hu Ziji <huziji@marvell.com>
> Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
> Tested-by: Jisheng Zhang <jszhang@marvell.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
> Hu Ziji has left marvell, submit the patch for him.
> I will submit a patch to change xenon driver maintainer information and take over the ownership.
> v2:
>  Add Signed-off-by Hu Ziji <huziji@marvell.com>.
> v3:
>  Since Hu Ziji wrote the patch, correct the author information.
>  drivers/mmc/host/sdhci-xenon.c | 42 +++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 41 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index bc1781b..9f399c4 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -519,6 +519,46 @@ static int xenon_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int xenon_suspend(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int ret;
> +
> +	ret = sdhci_suspend_host(host);
> +	if (ret)
> +		return ret;
> +
> +	clk_disable_unprepare(pltfm_host->clk);
> +	return ret;
> +}
> +
> +static int xenon_resume(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int ret;
> +
> +	ret = clk_prepare_enable(pltfm_host->clk);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * If SoCs power off the entire Xenon, registers setting will
> +	 * be lost.
> +	 * Re-configure Xenon specific register to enable current SDHC
> +	 */
> +	ret = xenon_sdhc_prepare(host);
> +	if (ret)
> +		return ret;
> +
> +	return sdhci_resume_host(host);
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(xenon_pmops, xenon_suspend, xenon_resume);
> +
>  static const struct of_device_id sdhci_xenon_dt_ids[] = {
>  	{ .compatible = "marvell,armada-ap806-sdhci",},
>  	{ .compatible = "marvell,armada-cp110-sdhci",},
> @@ -531,7 +571,7 @@ static int xenon_remove(struct platform_device *pdev)
>  	.driver	= {
>  		.name	= "xenon-sdhci",
>  		.of_match_table = sdhci_xenon_dt_ids,
> -		.pm = &sdhci_pltfm_pmops,
> +		.pm = &xenon_pmops,
>  	},
>  	.probe	= xenon_probe,
>  	.remove	= xenon_remove,
>