drivers: usb: common: nrf_usbd_common: Handle USB SoF IRQ first

The processing order is relevant if the IRQ handler call is delayed and
multiple interrupts are pending. Handle USB SoF before other interrupts
to ensure that it would be reported before other USB events (e.g. before
completed USB data transfers).

Signed-off-by: Marek Pieta <[email protected]>

Author: MarekPieta

drivers/usb/common/nrf_usbd_common/nrf_usbd_common.c

@@ -1029,6 +1029,16 @@ void nrf_usbd_common_irq_handler(void)
 	volatile uint32_t *dma_endevent;
 	uint32_t epdatastatus = 0;
 
+	/* Always check and clear SOF but call handler only if SOF interrupt
+	 * is actually enabled.
+	 */
+	if (NRF_USBD->EVENTS_SOF) {
+		NRF_USBD->EVENTS_SOF = 0;
+		if (NRF_USBD->INTENSET & USBD_INTEN_SOF_Msk) {
+			ev_sof_handler();
+		}
+	}
+
 	/* Clear EPDATA event and only then get and clear EPDATASTATUS to make
 	 * sure we don't miss any event.
 	 */
@@ -1066,16 +1076,6 @@ void nrf_usbd_common_irq_handler(void)
 		ev_usbreset_handler();
 	}
 
-	/* Always check and clear SOF but call handler only if SOF interrupt
-	 * is actually enabled.
-	 */
-	if (NRF_USBD->EVENTS_SOF) {
-		NRF_USBD->EVENTS_SOF = 0;
-		if (NRF_USBD->INTENSET & USBD_INTEN_SOF_Msk) {
-			ev_sof_handler();
-		}
-	}
-
 	if (NRF_USBD->EVENTS_USBEVENT) {
 		NRF_USBD->EVENTS_USBEVENT = 0;
 		ev_usbevent_handler();