usb: dwc3: gadget: use evt->cache for processing events (ebbb2d59) · Commits · 戴 / test

Let's start copying events from evt->buf to evt->cache and use evt->cache for processing events. A follow-up patch will be added to clear events in the top-half handler in order to bring IRQ line low as soon as possible. Signed-off-by:

John Youn <johnyoun@synopsys.com> Signed-off-by:

Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/gadget.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -2821,7 +2821,7 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
		while (left > 0) {
		union dwc3_event event;

		event.raw = (u32 ) (evt->buf + evt->lpos);
		event.raw = (u32 ) (evt->cache + evt->lpos);

		dwc3_process_event_entry(dwc, &event);

		@@ -2869,6 +2869,7 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
		static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
		{
		struct dwc3 *dwc = evt->dwc;
		u32 amount;
		u32 count;
		u32 reg;

		@@ -2892,6 +2893,12 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
		reg \|= DWC3_GEVNTSIZ_INTMASK;
		dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);

		amount = min(count, evt->length - evt->lpos);
		memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);

		if (amount < count)
		memcpy(evt->cache, evt->buf, count - amount);

		return IRQ_WAKE_THREAD;
		}

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