On 29/08/17 21:54, Zhoujie Wu wrote:
> Enable runtime pm support for xenon controller, which uses 50ms
> auto runtime suspend by default.
> Reimplement system standby based on runtime pm API.
> Introduce restore_needed to restore the Xenon specific registers
> when resume.
>
> Signed-off-by: Zhoujie Wu <zjwu@xxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> v3: Updated according to the comments from Adrian.
>
> v2: Combined two previous patches(runtime pm support and reimplement standby)
> to one according to the suggestion from Adrian.
>
> drivers/mmc/host/sdhci-xenon.c | 87 ++++++++++++++++++++++++++++++++++--------
> drivers/mmc/host/sdhci-xenon.h | 1 +
> 2 files changed, 72 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 306ffaf..2eec2e6 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -18,6 +18,8 @@
> #include <linux/ktime.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
>
> #include "sdhci-pltfm.h"
> #include "sdhci-xenon.h"
> @@ -506,13 +508,24 @@ static int xenon_probe(struct platform_device *pdev)
> if (err)
> goto err_clk;
>
> + pm_runtime_get_noresume(&pdev->dev);
> + pm_runtime_set_active(&pdev->dev);
> + pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
> + pm_runtime_use_autosuspend(&pdev->dev);
> + pm_runtime_enable(&pdev->dev);
> + pm_suspend_ignore_children(&pdev->dev, 1);
> +
> err = sdhci_add_host(host);
> if (err)
> goto remove_sdhc;
>
> + pm_runtime_put_autosuspend(&pdev->dev);
> +
> return 0;
>
> remove_sdhc:
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> xenon_sdhc_unprepare(host);
> err_clk:
> clk_disable_unprepare(pltfm_host->clk);
> @@ -526,6 +539,10 @@ static int xenon_remove(struct platform_device *pdev)
> struct sdhci_host *host = platform_get_drvdata(pdev);
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>
> + pm_runtime_get_sync(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> +
> sdhci_remove_host(host, 0);
>
> xenon_sdhc_unprepare(host);
> @@ -542,40 +559,78 @@ static int xenon_suspend(struct device *dev)
> {
> struct sdhci_host *host = dev_get_drvdata(dev);
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> int ret;
>
> - ret = sdhci_suspend_host(host);
> - if (ret)
> - return ret;
> + ret = pm_runtime_force_suspend(dev);
>
> - clk_disable_unprepare(pltfm_host->clk);
> + priv->restore_needed = true;
> return ret;
> }
> +#endif
>
> -static int xenon_resume(struct device *dev)
> +#ifdef CONFIG_PM
> +static int xenon_runtime_suspend(struct device *dev)
> {
> struct sdhci_host *host = dev_get_drvdata(dev);
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> int ret;
>
> - ret = clk_prepare_enable(pltfm_host->clk);
> + ret = sdhci_runtime_suspend_host(host);
> if (ret)
> return ret;
>
> + if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> + mmc_retune_needed(host->mmc);
> +
> + clk_disable_unprepare(pltfm_host->clk);
> /*
> - * If SoCs power off the entire Xenon, registers setting will
> - * be lost.
> - * Re-configure Xenon specific register to enable current SDHC
> + * Need to update the priv->clock here, or when runtime resume
> + * back, phy don't aware the clock change and won't adjust phy
> + * which will cause cmd err
> */
> - ret = xenon_sdhc_prepare(host);
> - if (ret)
> + priv->clock = 0;
> + return 0;
> +}
> +
> +static int xenon_runtime_resume(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> + int ret;
> +
> + ret = clk_prepare_enable(pltfm_host->clk);
> + if (ret) {
> + dev_err(dev, "can't enable mainck\n");
> return ret;
> + }
>
> - return sdhci_resume_host(host);
> -}
> -#endif
> + if (priv->restore_needed) {
> + ret = xenon_sdhc_prepare(host);
> + if (ret)
> + goto out;
> + priv->restore_needed = false;
> + }
>
> -static SIMPLE_DEV_PM_OPS(xenon_pmops, xenon_suspend, xenon_resume);
> + ret = sdhci_runtime_resume_host(host);
> + if (ret)
> + goto out;
> + return 0;
> +out:
> + clk_disable_unprepare(pltfm_host->clk);
> + return ret;
> +}
> +#endif /* CONFIG_PM */
> +
> +static const struct dev_pm_ops sdhci_xenon_dev_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(xenon_suspend,
> + pm_runtime_force_resume)
> + SET_RUNTIME_PM_OPS(xenon_runtime_suspend,
> + xenon_runtime_resume,
> + NULL)
> +};
>
> static const struct of_device_id sdhci_xenon_dt_ids[] = {
> { .compatible = "marvell,armada-ap806-sdhci",},
> @@ -589,7 +644,7 @@ static int xenon_resume(struct device *dev)
> .driver = {
> .name = "xenon-sdhci",
> .of_match_table = sdhci_xenon_dt_ids,
> - .pm = &xenon_pmops,
> + .pm = &sdhci_xenon_dev_pm_ops,
> },
> .probe = xenon_probe,
> .remove = xenon_remove,
> diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> index 01937f1..2bc0510 100644
> --- a/drivers/mmc/host/sdhci-xenon.h
> +++ b/drivers/mmc/host/sdhci-xenon.h
> @@ -91,6 +91,7 @@ struct xenon_priv {
> */
> void *phy_params;
> struct xenon_emmc_phy_regs *emmc_phy_regs;
> + bool restore_needed;
> };
>
> int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
>
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