summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-atmel.c
diff options
context:
space:
mode:
authorSylvain Rochet <sylvain.rochet@finsecur.com>2015-01-20 16:38:59 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-25 16:06:42 +0300
commitca2c1dc04b3fe8846d691adecfd65978b7ed3008 (patch)
tree2af8ac7d2e214104b18f2a5e05229247188dea65 /drivers/usb/host/ehci-atmel.c
parentfbaecff06a7db4defa899a664fe2758e5161b39d (diff)
downloadlinux-ca2c1dc04b3fe8846d691adecfd65978b7ed3008.tar.xz
USB: host: ehci-atmel: Add suspend/resume support
This patch add suspend/resume support for Atmel EHCI, mostly about disabling and unpreparing clocks so USB PLL is stopped before entering sleep state. Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-atmel.c')
-rw-r--r--drivers/usb/host/ehci-atmel.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index 56a88506febe..5a15e3dd006b 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -37,6 +37,8 @@ static int clocked;
static void atmel_start_clock(void)
{
+ if (clocked)
+ return;
if (IS_ENABLED(CONFIG_COMMON_CLK)) {
clk_set_rate(uclk, 48000000);
clk_prepare_enable(uclk);
@@ -48,6 +50,8 @@ static void atmel_start_clock(void)
static void atmel_stop_clock(void)
{
+ if (!clocked)
+ return;
clk_disable_unprepare(fclk);
clk_disable_unprepare(iclk);
if (IS_ENABLED(CONFIG_COMMON_CLK))
@@ -174,6 +178,29 @@ static int ehci_atmel_drv_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int ehci_atmel_drv_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ int ret;
+
+ ret = ehci_suspend(hcd, false);
+ if (ret)
+ return ret;
+
+ atmel_stop_clock();
+ return 0;
+}
+
+static int ehci_atmel_drv_resume(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ atmel_start_clock();
+ return ehci_resume(hcd, false);
+}
+#endif
+
#ifdef CONFIG_OF
static const struct of_device_id atmel_ehci_dt_ids[] = {
{ .compatible = "atmel,at91sam9g45-ehci" },
@@ -183,12 +210,16 @@ static const struct of_device_id atmel_ehci_dt_ids[] = {
MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
#endif
+static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend,
+ ehci_atmel_drv_resume);
+
static struct platform_driver ehci_atmel_driver = {
.probe = ehci_atmel_drv_probe,
.remove = ehci_atmel_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "atmel-ehci",
+ .pm = &ehci_atmel_pm_ops,
.of_match_table = of_match_ptr(atmel_ehci_dt_ids),
},
};