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mmc: dw_mmc: add runtime PM callback 

This patch add dw_mci_runtime_suspend/resume interfaces
and expose it to dw_mci variant driver to support runtime
PM.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-10-12 10:50:35 +08:00 committed by Ulf Hansson
parent 70562644f4
commit e9ed8835e9
2 changed files with 33 additions and 3 deletions
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32
drivers/mmc/host/dw_mmc.c
View File

@ -3267,7 +3267,7 @@ EXPORT_SYMBOL(dw_mci_remove);
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_PM
/*
* TODO: we should probably disable the clock to the card in the suspend path.
*/
@ -3325,7 +3325,35 @@ int dw_mci_resume(struct dw_mci *host)
return 0;
}
EXPORT_SYMBOL(dw_mci_resume);
#endif /* CONFIG_PM_SLEEP */
int dw_mci_runtime_suspend(struct device *dev)
{
int err = 0;
struct dw_mci *host = dev_get_drvdata(dev);
err = dw_mci_suspend(host);
if (err)
return err;
clk_disable_unprepare(host->ciu_clk);
return err;
}
EXPORT_SYMBOL(dw_mci_runtime_suspend);
int dw_mci_runtime_resume(struct device *dev)
{
int ret = 0;
struct dw_mci *host = dev_get_drvdata(dev);
ret = clk_prepare_enable(host->ciu_clk);
if (ret)
return ret;
return dw_mci_resume(host);
}
EXPORT_SYMBOL(dw_mci_runtime_resume);
#endif /* CONFIG_PM */
static int __init dw_mci_init(void)
{

4
drivers/mmc/host/dw_mmc.h
View File

@ -234,9 +234,11 @@
extern int dw_mci_probe(struct dw_mci *host);
extern void dw_mci_remove(struct dw_mci *host);
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_PM
extern int dw_mci_suspend(struct dw_mci *host);
extern int dw_mci_resume(struct dw_mci *host);
extern int dw_mci_runtime_suspend(struct device *device);
extern int dw_mci_runtime_resume(struct device *device);
#endif
/**