usb: dwc3: optimize interrupt loop

There is no point in calling dwc3_thread_interrupt() if no event is
pending. There is also no point in flushing event cache in EVERY loop
iteration.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 33d2cf2..ab3c94e 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -769,18 +769,11 @@ void dwc3_uboot_exit(int index)
 void dwc3_uboot_handle_interrupt(int index)
 {
        struct dwc3 *dwc = NULL;
-       int i;
-       struct dwc3_event_buffer *evt;
 
        list_for_each_entry(dwc, &dwc3_list, list) {
                if (dwc->index != index)
                        continue;
 
-               for (i = 0; i < dwc->num_event_buffers; i++) {
-                       evt = dwc->ev_buffs[i];
-                       dwc3_flush_cache((int)evt->buf, evt->length);
-               }
-
                dwc3_gadget_uboot_handle_interrupt(dwc);
                break;
        }

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7c342c6..eb31cd9 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2683,6 +2683,17 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
  */
 void dwc3_gadget_uboot_handle_interrupt(struct dwc3 *dwc)
 {
-       dwc3_interrupt(0, dwc);
-       dwc3_thread_interrupt(0, dwc);
+       int ret = dwc3_interrupt(0, dwc);
+
+       if (ret == IRQ_WAKE_THREAD) {
+               int i;
+               struct dwc3_event_buffer *evt;
+
+               for (i = 0; i < dwc->num_event_buffers; i++) {
+                       evt = dwc->ev_buffs[i];
+                       dwc3_flush_cache((int)evt->buf, evt->length);
+               }
+
+               dwc3_thread_interrupt(0, dwc);
+       }
 }