diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-08-13 16:00:16 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-09-04 03:36:05 +0400 |
| commit | 3cb6f10a4d925ec21f414bc30a8aded2830963e5 (patch) | |
| tree | b283b2ab8fed7b3b50ce5fa9acd61b635da62416 /drivers | |
| parent | bad813831e291cf34a007e6f03c37cf95037c868 (diff) | |
| download | linux-3cb6f10a4d925ec21f414bc30a8aded2830963e5.tar.xz | |
sh: MTU2: Basic runtime PM support
Modify the SH MTU2 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 device has to be marked as
"irq safe").
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clocksource/sh_mtu2.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c index 1a95cad96819..c5eea858054a 100644 --- a/drivers/clocksource/sh_mtu2.c +++ b/drivers/clocksource/sh_mtu2.c @@ -32,6 +32,7 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/pm_domain.h> +#include <linux/pm_runtime.h> struct sh_mtu2_priv { void __iomem *mapbase; @@ -123,6 +124,9 @@ static int sh_mtu2_enable(struct sh_mtu2_priv *p) { int 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) { @@ -157,6 +161,9 @@ static void sh_mtu2_disable(struct sh_mtu2_priv *p) /* stop clock */ clk_disable(p->clk); + + dev_pm_syscore_device(&p->pdev->dev, false); + pm_runtime_put(&p->pdev->dev); } static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id) @@ -317,18 +324,17 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev) static int __devinit sh_mtu2_probe(struct platform_device *pdev) { struct sh_mtu2_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->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); @@ -341,8 +347,19 @@ static int __devinit sh_mtu2_probe(struct platform_device *pdev) 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) + pm_runtime_irq_safe(&pdev->dev); + else + pm_runtime_idle(&pdev->dev); + + return 0; } static int __devexit sh_mtu2_remove(struct platform_device *pdev) |