USB: gadget: Implement runtime PM for ci13xxx gadget

The actual suspend/resume work is delegated to bus glue driver, which
is responsible for putting hardware in low power mode.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c
index c10d1aee5230..f200e472e476 100644
--- a/drivers/usb/gadget/ci13xxx_udc.c
+++ b/drivers/usb/gadget/ci13xxx_udc.c
@@ -60,6 +60,7 @@
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/otg.h>
@@ -2348,6 +2349,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
 
         if (gadget_ready) {
                 if (is_active) {
+                        pm_runtime_get_sync(&_gadget->dev);
                         hw_device_reset(udc);
                         hw_device_state(udc->ci13xxx_ep[0].qh[RX].dma);
                 } else {
@@ -2356,6 +2358,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
                                 udc->udc_driver->notify_event(udc,
                                 CI13XXX_CONTROLLER_STOPPED_EVENT);
                         _gadget_stop_activity(&udc->gadget);
+                        pm_runtime_put_sync(&_gadget->dev);
                 }
         }
 
@@ -2473,16 +2476,20 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
                 goto done;
         }
 
+        pm_runtime_get_sync(&udc->gadget.dev);
         if (udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) {
                 if (udc->vbus_active) {
                         if (udc->udc_driver->flags & CI13XXX_REGS_SHARED)
                                 hw_device_reset(udc);
                 } else {
+                        pm_runtime_put_sync(&udc->gadget.dev);
                         goto done;
                 }
         }
 
         retval = hw_device_state(udc->ci13xxx_ep[0].qh[RX].dma);
+        if (retval)
+                pm_runtime_put_sync(&udc->gadget.dev);
 
  done:
         spin_unlock_irqrestore(udc->lock, flags);
@@ -2522,6 +2529,7 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
                         udc->udc_driver->notify_event(udc,
                         CI13XXX_CONTROLLER_STOPPED_EVENT);
                 _gadget_stop_activity(&udc->gadget);
+                pm_runtime_put(&udc->gadget.dev);
         }
 
         /* unbind gadget */
@@ -2723,6 +2731,8 @@ static int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
                 if (retval)
                         goto remove_dbg;
         }
+        pm_runtime_no_callbacks(&udc->gadget.dev);
+        pm_runtime_enable(&udc->gadget.dev);
 
         _udc = udc;
         return retval;