Allows the driver to turn off the clock during suspend for additional power savings.
Signed-off-by: Michael Welling <mwelling@xxxxxxxx>
---
drivers/usb/host/ehci-atmel.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index ec9f7b7..004858d 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -19,6 +19,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/platform_data/atmel.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@@ -181,6 +182,40 @@ static int ehci_atmel_drv_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int
+ehci_atmel_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(hcd->irq);
+
+ if (at91_suspend_entering_slow_clock())
+ atmel_stop_clock();
+
+ ehci_suspend(hcd, (bool) device_may_wakeup(&pdev->dev));
+ return 0;
+}
+
+static int ehci_atmel_drv_resume(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(hcd->irq);
+
+ if (!clocked)
+ atmel_start_clock();
+
+ ehci_resume(hcd, false);
+ return 0;
+}
+#else
+#define ehci_atmel_drv_suspend NULL
+#define ehci_atmel_drv_resume NULL
+#endif
+
#ifdef CONFIG_OF
static const struct of_device_id atmel_ehci_dt_ids[] = {
{ .compatible = "atmel,at91sam9g45-ehci" },
@@ -193,6 +228,8 @@ MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
static struct platform_driver ehci_atmel_driver = {
.probe = ehci_atmel_drv_probe,
.remove = ehci_atmel_drv_remove,
+ .suspend = ehci_atmel_drv_suspend,
+ .resume = ehci_atmel_drv_resume,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "atmel-ehci",
--
1.7.9.5
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