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mmc: sdhci-of-at91: add PM support 

Add runtime PM support and use runtime_force_suspend|resume() for system
PM.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
ludovic.desroches@atmel.com 2015-11-11 19:11:48 +01:00 committed by Ulf Hansson
parent 28ff4fda9e
commit f5f17813ae
1 changed files with 73 additions and 2 deletions
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75
drivers/mmc/host/sdhci-of-at91.c
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@ -21,6 +21,8 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include "sdhci-pltfm.h"
@ -51,6 +53,60 @@ static const struct of_device_id sdhci_at91_dt_match[] = {
{}
};
#ifdef CONFIG_PM
static int sdhci_at91_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_at91_priv *priv = pltfm_host->priv;
int ret;
ret = sdhci_runtime_suspend_host(host);
clk_disable_unprepare(priv->gck);
clk_disable_unprepare(priv->hclock);
clk_disable_unprepare(priv->mainck);
return ret;
}
static int sdhci_at91_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_at91_priv *priv = pltfm_host->priv;
int ret;
ret = clk_prepare_enable(priv->mainck);
if (ret) {
dev_err(dev, "can't enable mainck\n");
return ret;
}
ret = clk_prepare_enable(priv->hclock);
if (ret) {
dev_err(dev, "can't enable hclock\n");
return ret;
}
ret = clk_prepare_enable(priv->gck);
if (ret) {
dev_err(dev, "can't enable gck\n");
return ret;
}
return sdhci_runtime_resume_host(host);
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops sdhci_at91_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(sdhci_at91_runtime_suspend,
sdhci_at91_runtime_resume,
NULL)
};
static int sdhci_at91_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
@ -144,12 +200,23 @@ static int sdhci_at91_probe(struct platform_device *pdev)
sdhci_get_of_property(pdev);
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);
ret = sdhci_add_host(host);
if (ret)
goto clocks_disable_unprepare;
goto pm_runtime_disable;
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
pm_runtime_disable:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
clocks_disable_unprepare:
clk_disable_unprepare(priv->gck);
clk_disable_unprepare(priv->mainck);
@ -165,6 +232,10 @@ static int sdhci_at91_remove(struct platform_device *pdev)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_at91_priv *priv = pltfm_host->priv;
pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
sdhci_pltfm_unregister(pdev);
clk_disable_unprepare(priv->gck);
@ -178,7 +249,7 @@ static struct platform_driver sdhci_at91_driver = {
.driver = {
.name = "sdhci-at91",
.of_match_table = sdhci_at91_dt_match,
.pm = SDHCI_PLTFM_PMOPS,
.pm = &sdhci_at91_dev_pm_ops,
},
.probe = sdhci_at91_probe,
.remove = sdhci_at91_remove,