[PATCH 4/4] devfreq: exynos4: Use SET_SYSTEM_SLEEP_PM_OPS macro instead of legacy method

Chanwoo Choi
2014-03-12T11:49:23Z

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.choi@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