On 20/04/17 08:44, Shubhrajyoti Datta wrote:
> Currently the clock are enabled at probe and released at driver
> removal. This moves to enable before mmc read/ write and disables
> after it.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-of-arasan.c | 50 ++++++++++++++++++++++++++++++++++++--
> 1 file changed, 48 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 1cfd7f9..812e75a 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -24,6 +24,7 @@
> #include <linux/module.h>
> #include <linux/of_device.h>
> #include <linux/phy/phy.h>
> +#include <linux/pm_runtime.h>
> #include <linux/regmap.h>
> #include "sdhci-pltfm.h"
> #include <linux/of.h>
> @@ -373,10 +374,44 @@ static int sdhci_arasan_resume(struct device *dev)
>
> return sdhci_resume_host(host);
> }
> +
Runtime PM is under CONFIG_PM not CONFIG_PM_SLEEP
> +static int sdhci_arasan_runtime_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> + int ret;
> +
> + ret = sdhci_runtime_suspend_host(host);
Other drivers now have:
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
If you don't need re-tuning, maybe add a comment so we know.
> +
> + clk_disable_unprepare(pltfm_host->clk);
> + clk_disable_unprepare(sdhci_arasan->clk_ahb);
> +
> + return ret;
> +}
> +
> +static int sdhci_arasan_runtime_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> +
> + clk_prepare_enable(pltfm_host->clk);
> + clk_prepare_enable(sdhci_arasan->clk_ahb);
> +
> + return sdhci_runtime_resume_host(host);
> +}
> #endif /* ! CONFIG_PM_SLEEP */
>
> -static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
> - sdhci_arasan_resume);
> +static const struct dev_pm_ops sdhci_arasan_dev_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(sdhci_arasan_suspend,
> + sdhci_arasan_resume)
> + SET_RUNTIME_PM_OPS(sdhci_arasan_runtime_suspend,
> + sdhci_arasan_runtime_resume,
> + NULL)
> +};
>
> static const struct of_device_id sdhci_arasan_of_match[] = {
> /* SoC-specific compatible strings w/ soc_ctl_map */
> @@ -637,6 +672,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
> goto clk_dis_ahb;
> }
>
> + pm_runtime_get_noresume(&pdev->dev);
> + pm_runtime_set_active(&pdev->dev);
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
> + pm_runtime_use_autosuspend(&pdev->dev);
> +
> sdhci_get_of_property(pdev);
>
> if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
> @@ -687,6 +728,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
> if (ret)
> goto err_add_host;
>
> + pm_runtime_put(&pdev->dev);
> return 0;
>
> err_add_host:
> @@ -695,6 +737,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
> unreg_clk:
> sdhci_arasan_unregister_sdclk(&pdev->dev);
> clk_disable_all:
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_set_suspended(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> clk_disable_unprepare(clk_xin);
> clk_dis_ahb:
> clk_disable_unprepare(sdhci_arasan->clk_ahb);
> @@ -723,6 +768,7 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
>
> clk_disable_unprepare(clk_ahb);
>
> + pm_runtime_disable(&pdev->dev);
> return ret;
> }
>
>
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