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

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

[Zhoujie Wu]

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: Zhoujie Wu <zjwu@marvell.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
---
 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,
-- 
1.9.1

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

[Jisheng Zhang]

Hi Zhoujie,

On Fri, 7 Jul 2017 11:11:12 -0700 Zhoujie Wu wrote:

> 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.

This email shows you are the author of this patch. However,
IIRC, "Hu Ziji <huziji@marvell.com>" is the author of this patch, you are
just the committer. We'd better be honest.

> 

Hu Ziji has given his Signed off, why do you remove it?

PS: We'd better send patch after 4.13-rc1 is released.

Thanks

> Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
> Tested-by: Jisheng Zhang <jszhang@marvell.com>
> ---
>  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,