[U-Boot] [PATCH 08/11] usb: dwc3: optimize interrupt loop

[Lukasz Majewski]

From: Marek Szyprowski <m.szyprowski at samsung.com>

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 at samsung.com>
---
 drivers/usb/dwc3/core.c   |  7 -------
 drivers/usb/dwc3/gadget.c | 15 +++++++++++++--
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fc3b0d9..846475a 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -844,18 +844,11 @@ 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 f8a75d3..4a4923f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2680,6 +2680,17 @@ 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);
+	}
 }
-- 
2.0.0.rc2