This patch use SET_SYSTEM_SLEEP_PM_OPS macro instead of legacy method. Also, Before entering suspend state, disable ppmu's clock to remove power-leakage in suspend state.
Signed-off-by: Chanwoo Choi <cw00.c...@samsung.com> --- drivers/devfreq/exynos/exynos4_bus.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c index 0c5b99e..7e1540a 100644 --- a/drivers/devfreq/exynos/exynos4_bus.c +++ b/drivers/devfreq/exynos/exynos4_bus.c @@ -1229,16 +1229,40 @@ static int exynos4_busfreq_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP static int exynos4_busfreq_resume(struct device *dev) { struct busfreq_data *data = dev_get_drvdata(dev); + int i; + + /* Enable clock after wake-up from suspend state */ + for (i = 0; i < PPMU_END; i++) + clk_prepare_enable(data->clk_ppmu[i]); + /* Reset PPMU to check utilization again */ busfreq_mon_reset(data); + + return 0; +} + +static int exynos4_busfreq_suspend(struct device *dev) +{ + struct busfreq_data *data = dev_get_drvdata(dev); + int i; + + /* + * Disable clock before entering suspend state + * to reduce leakage power on suspend state. + */ + for (i = 0; i < PPMU_END; i++) + clk_disable_unprepare(data->clk_ppmu[i]); + return 0; } +#endif static const struct dev_pm_ops exynos4_busfreq_pm = { - .resume = exynos4_busfreq_resume, + SET_SYSTEM_SLEEP_PM_OPS(exynos4_busfreq_suspend, exynos4_busfreq_resume) }; static const struct platform_device_id exynos4_busfreq_id[] = { -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/