===================================================================
@@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
struct sh_cmt_priv {
void __iomem *mapbase;
@@ -52,6 +53,7 @@ struct sh_cmt_priv {
struct clock_event_device ced;
struct clocksource cs;
unsigned long total_cycles;
+ bool cs_enabled;
};
static DEFINE_RAW_SPINLOCK(sh_cmt_lock);
@@ -155,6 +157,9 @@ static int sh_cmt_enable(struct sh_cmt_p
{
int k, ret;
+ pm_runtime_get_sync(&p->pdev->dev);
+ dev_pm_syscore_device(&p->pdev->dev, true);
+
/* enable clock */
ret = clk_enable(p->clk);
if (ret) {
@@ -221,6 +226,9 @@ static void sh_cmt_disable(struct sh_cmt
/* stop clock */
clk_disable(p->clk);
+
+ dev_pm_syscore_device(&p->pdev->dev, false);
+ pm_runtime_put(&p->pdev->dev);
}
/* private flags */
@@ -451,17 +459,26 @@ static int sh_cmt_clocksource_enable(str
int ret;
struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
+ WARN_ON(p->cs_enabled);
+
p->total_cycles = 0;
ret = sh_cmt_start(p, FLAG_CLOCKSOURCE);
- if (!ret)
+ if (!ret) {
__clocksource_updatefreq_hz(cs, p->rate);
+ p->cs_enabled = true;
+ }
return ret;
}
static void sh_cmt_clocksource_disable(struct clocksource *cs)
{
- sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE);
+ struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
+
+ WARN_ON(!p->cs_enabled);
+
+ sh_cmt_stop(p, FLAG_CLOCKSOURCE);
+ p->cs_enabled = false;
}
static void sh_cmt_clocksource_suspend(struct clocksource *cs)
@@ -693,6 +710,7 @@ static int sh_cmt_setup(struct sh_cmt_pr
dev_err(&p->pdev->dev, "registration failed\n");
goto err1;
}
+ p->cs_enabled = false;
ret = setup_irq(irq, &p->irqaction);
if (ret) {
@@ -711,18 +729,17 @@ err0:
static int __devinit sh_cmt_probe(struct platform_device *pdev)
{
struct sh_cmt_priv *p = platform_get_drvdata(pdev);
+ struct sh_timer_config *cfg = pdev->dev.platform_data;
int ret;
if (!is_early_platform_device(pdev)) {
- struct sh_timer_config *cfg = pdev->dev.platform_data;
-
- if (cfg->clocksource_rating || cfg->clockevent_rating)
- dev_pm_syscore_device(&pdev->dev, true);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
}
if (p) {
dev_info(&pdev->dev, "kept as earlytimer\n");
- return 0;
+ goto out;
}
p = kmalloc(sizeof(*p), GFP_KERNEL);
@@ -735,8 +752,19 @@ static int __devinit sh_cmt_probe(struct
if (ret) {
kfree(p);
platform_set_drvdata(pdev, NULL);
+ pm_runtime_idle(&pdev->dev);
+ return ret;
}
- return ret;
+ if (is_early_platform_device(pdev))
+ return 0;
+
+ out:
+ if (cfg->clockevent_rating || cfg->clocksource_rating)
+ pm_runtime_irq_safe(&pdev->dev);
+ else
+ pm_runtime_idle(&pdev->dev);
+
+ return 0;
}
static int __devexit sh_cmt_remove(struct platform_device *pdev)
Modify the SH CMT clock source/clock event device driver to support runtime PM at a basic level (i.e. device clocks can be disabled and enabled, but domain power must be on, because the devices have to be marked as "irq safe"). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> --- drivers/clocksource/sh_cmt.c | 44 +++++++++++++++++++++++++++++++++++-------- 1 file changed, 36 insertions(+), 8 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html