usb: dwc3: Use high priority worker as bottom half handler
Latency involved in handling dwc3 interrupt in real time threaded
interrupt is sometimes resulting into RT throttling. Hence queue
bottom half work from dwc3 hard irq handler to a high priority
workqueue. Also, update the corresponding irq flag in host
controller platform driver.
Change-Id: If65a522efb6d792eea7fa7afc4c5e4dcd1cb6fb8
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 55fbe29..a5d3209f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3504,6 +3504,15 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc)
return ret;
}
+void dwc3_bh_work(struct work_struct *w)
+{
+ struct dwc3 *dwc = container_of(w, struct dwc3, bh_work);
+
+ pm_runtime_get_sync(dwc->dev);
+ dwc3_thread_interrupt(dwc->irq, dwc);
+ pm_runtime_put(dwc->dev);
+}
+
static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
{
struct dwc3 *dwc = _dwc;
@@ -3588,7 +3597,7 @@ irqreturn_t dwc3_interrupt(int irq, void *_dwc)
dwc->irq_dbg_index = (dwc->irq_dbg_index + 1) % MAX_INTR_STATS;
if (ret == IRQ_WAKE_THREAD)
- dwc3_thread_interrupt(dwc->irq, dwc);
+ queue_work(dwc->dwc_wq, &dwc->bh_work);
return IRQ_HANDLED;
}