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mmc: sdhci-esdhc-imx: add runtime pm support 

The root clock will be disabled in runtime pm to save power.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
hifive-unleashed-5.1
Dong Aisheng 2013-11-04 16:38:29 +08:00 committed by Chris Ball
parent ce090a4eb9
commit 89d7e5c131
1 changed files with 48 additions and 1 deletions
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49
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -27,6 +27,7 @@
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/mmc-esdhc-imx.h>
#include <linux/pm_runtime.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
@ -1121,6 +1122,12 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
if (err)
goto disable_clk;
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);
pm_suspend_ignore_children(&pdev->dev, 1);
return 0;
disable_clk:
@ -1141,6 +1148,9 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
sdhci_remove_host(host, dead);
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
@ -1150,12 +1160,49 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int sdhci_esdhc_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
int ret;
ret = sdhci_runtime_suspend_host(host);
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
return ret;
}
static int sdhci_esdhc_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
clk_prepare_enable(imx_data->clk_per);
clk_prepare_enable(imx_data->clk_ipg);
clk_prepare_enable(imx_data->clk_ahb);
return sdhci_runtime_resume_host(host);
}
#endif
static const struct dev_pm_ops sdhci_esdhc_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,
sdhci_esdhc_runtime_resume, NULL)
};
static struct platform_driver sdhci_esdhc_imx_driver = {
.driver = {
.name = "sdhci-esdhc-imx",
.owner = THIS_MODULE,
.of_match_table = imx_esdhc_dt_ids,
.pm = SDHCI_PLTFM_PMOPS,
.pm = &sdhci_esdhc_pmops,
},
.id_table = imx_esdhc_devtype,
.probe = sdhci_esdhc_imx_probe,