Adds suspend and resume callbacks to exynos dwc3 driver as part of
power management support.
This change does gating of dwc3 clock during suspend/resume cycles.
Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx>
Signed-off-by: Vikas C Sajjan <vikas.sajjan@xxxxxxxxxx>
CC: Doug Anderson <dianders@xxxxxxxxxxxx>
---
drivers/usb/dwc3/dwc3-exynos.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index ca65978..8623b70 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dwc3-exynos.h>
#include <linux/dma-mapping.h>
@@ -200,11 +201,41 @@ static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int dwc3_exynos_suspend(struct device *dev)
+{
+ struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+
+ clk_disable(exynos->clk);
+
+ return 0;
+}
+
+static int dwc3_exynos_resume(struct device *dev)
+{
+ struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+
+ clk_enable(exynos->clk);
+
+ /* runtime set active to reflect active state. */
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops dwc3_exynos_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
+};
+
static struct platform_driver dwc3_exynos_driver = {
.probe = dwc3_exynos_probe,
.remove = __devexit_p(dwc3_exynos_remove),
.driver = {
.name = "exynos-dwc3",
+ .pm = &dwc3_exynos_pm_ops,
},
};
--
1.7.6.5
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