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    Subject[PATCH 14/15] sh: MTU2: Basic runtime PM support
    Date

    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>
    ---
    drivers/clocksource/sh_mtu2.c | 28 ++++++++++++++++++++++------
    1 file changed, 22 insertions(+), 6 deletions(-)

    Index: linux/drivers/clocksource/sh_mtu2.c
    ===================================================================
    --- linux.orig/drivers/clocksource/sh_mtu2.c
    +++ linux/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
    {
    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_mt

    /* 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)
    @@ -320,15 +327,13 @@ static int __devinit sh_mtu2_probe(struc
    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 +346,19 @@ static int __devinit sh_mtu2_probe(struc
    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)


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      Last update: 2012-08-06 02:21    [W:0.032 / U:0.016 seconds]
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