usb: dwc2/gadget: disable clock when it's not needed

When device is stopped or suspended clock is not needed so we
can disable it for this time.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 09f4cbd4fcb951896f331a7a332db9b7012a8618..650a43ba79e5089d4758b1c01afd46d4c5a763fd 100644 (file)
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2893,6 +2893,8 @@ static int s3c_hsotg_udc_start(struct usb_gadget *gadget,
        hsotg->gadget.dev.of_node = hsotg->dev->of_node;
        hsotg->gadget.speed = USB_SPEED_UNKNOWN;
 
+       clk_enable(hsotg->clk);
+
        ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
                                    hsotg->supplies);
        if (ret) {
@@ -2941,6 +2943,8 @@ static int s3c_hsotg_udc_stop(struct usb_gadget *gadget,
 
        regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
 
+       clk_disable(hsotg->clk);
+
        return 0;
 }
 
@@ -2972,8 +2976,10 @@ static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on)
        spin_lock_irqsave(&hsotg->lock, flags);
        if (is_on) {
                s3c_hsotg_phy_enable(hsotg);
+               clk_enable(hsotg->clk);
                s3c_hsotg_core_init(hsotg);
        } else {
+               clk_disable(hsotg->clk);
                s3c_hsotg_phy_disable(hsotg);
        }
 
@@ -3636,6 +3642,7 @@ static int s3c_hsotg_suspend(struct platform_device *pdev, pm_message_t state)
 
                ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
                                             hsotg->supplies);
+               clk_disable(hsotg->clk);
        }
 
        return ret;
@@ -3650,6 +3657,8 @@ static int s3c_hsotg_resume(struct platform_device *pdev)
        if (hsotg->driver) {
                dev_info(hsotg->dev, "resuming usb gadget %s\n",
                         hsotg->driver->driver.name);
+
+               clk_enable(hsotg->clk);
                ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
                                      hsotg->supplies);
        }