On Wed, 2 Oct 2013, Ulf Hansson wrote:
> Implement callbacks for runtime suspend|resume and leave the clock
> to be handled from there.
>
> The .set_ios function is still capable of using the interal registers
> to gate the clock when the frequency is zero, but the operations needed
> towards the clk API is now handled from the runtime callbacks.
>
> >From now on, CONFIG_PM_RUNTIME is required handle power save with full
> clock gating at request inactivity.
>
> Cc: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
> Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org>
> ---
> drivers/mmc/host/sh_mmcif.c | 47
> ++++++++++++++++++++++++++-----------------
> 1 file changed, 29 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
> index f4532dc..e234856 100644
> --- a/drivers/mmc/host/sh_mmcif.c
> +++ b/drivers/mmc/host/sh_mmcif.c
> @@ -964,19 +964,6 @@ static void sh_mmcif_request(struct mmc_host *mmc,
> struct mmc_request *mrq)
> sh_mmcif_start_cmd(host, mrq);
> }
>
> -static int sh_mmcif_clk_update(struct sh_mmcif_host *host)
> -{
> - int ret = clk_prepare_enable(host->hclk);
> -
> - if (!ret) {
> - host->clk = clk_get_rate(host->hclk);
> - host->mmc->f_max = host->clk / 2;
> - host->mmc->f_min = host->clk / 512;
> - }
> -
> - return ret;
> -}
> -
This reverts effect of this commit:
commit a6609267107ecc5598b79aa353036c1f57e7257e
Author: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
Date: Thu Apr 19 18:02:50 2012 +0200
mmc: sh_mmcif: re-read the clock frequency every time it is turned on
Thanks
Guennadi
> static void sh_mmcif_set_power(struct sh_mmcif_host *host, struct mmc_ios
> *ios)
> {
> struct mmc_host *mmc = host->mmc;
> @@ -1021,7 +1008,6 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc,
> struct mmc_ios *ios)
> }
> }
> if (host->power) {
> - clk_disable_unprepare(host->hclk);
> host->power = false;
> if (ios->power_mode == MMC_POWER_OFF)
> sh_mmcif_set_power(host, ios);
> @@ -1032,7 +1018,6 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc,
> struct mmc_ios *ios)
>
> if (ios->clock) {
> if (!host->power) {
> - sh_mmcif_clk_update(host);
> host->power = true;
> sh_mmcif_sync_reset(host);
> }
> @@ -1440,9 +1425,16 @@ static int sh_mmcif_probe(struct platform_device *pdev)
> dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
> goto eofparse;
> }
> - ret = sh_mmcif_clk_update(host);
> - if (ret < 0)
> +
> + ret = clk_prepare_enable(host->hclk);
> + if (ret) {
> + dev_err(&pdev->dev, "cannot enable clock: %d\n", ret);
> goto eclkupdate;
> + }
> +
> + host->clk = clk_get_rate(host->hclk);
> + host->mmc->f_max = host->clk / 2;
> + host->mmc->f_min = host->clk / 512;
>
> INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
>
> @@ -1478,7 +1470,6 @@ static int sh_mmcif_probe(struct platform_device *pdev)
> pm_runtime_set_active(&pdev->dev);
> pm_runtime_enable(&pdev->dev);
>
> - clk_disable_unprepare(host->hclk);
> ret = mmc_add_host(mmc);
> if (ret < 0)
> goto emmcaddh;
> @@ -1568,6 +1559,24 @@ static int sh_mmcif_resume(struct device *dev)
> }
> #endif
>
> +#ifdef CONFIG_PM_RUNTIME
> +static int sh_mmcif_runtime_suspend(struct device *dev)
> +{
> + struct sh_mmcif_host *host = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(host->hclk);
> + return 0;
> +}
> +
> +static int sh_mmcif_runtime_resume(struct device *dev)
> +{
> + struct sh_mmcif_host *host = dev_get_drvdata(dev);
> +
> + clk_prepare_enable(host->hclk);
> + return 0;
> +}
> +#endif
> +
> static const struct of_device_id mmcif_of_match[] = {
> { .compatible = "renesas,sh-mmcif" },
> { }
> @@ -1576,6 +1585,8 @@ MODULE_DEVICE_TABLE(of, mmcif_of_match);
>
> static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(sh_mmcif_suspend, sh_mmcif_resume)
> + SET_RUNTIME_PM_OPS(sh_mmcif_runtime_suspend, sh_mmcif_runtime_resume,
> + NULL)
> };
>
> static struct platform_driver sh_mmcif_driver = {
> --
> 1.7.9.5
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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