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Commit dea520a4 authored by Felipe Balbi's avatar Felipe Balbi
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usb: dwc3: gadget: pass ev_buff as cookie to irq handler 



we don't plan on using multiple event buffers, but
if we find a good use case for it, this little trick
will help us avoid a loop in hardirq handler looping
for each and every event buffer.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 696c8b12

drivers/usb/dwc3/gadget.c

+14 −16
Original line number Diff line number Diff line
@@ -1536,7 +1536,7 @@ static int dwc3_gadget_start(struct usb_gadget *g, 


	irq = platform_get_irq(to_platform_device(dwc->dev), 0);

	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,

			IRQF_SHARED, "dwc3", dwc);

			IRQF_SHARED, "dwc3", dwc->ev_buf);

	if (ret) {

		dev_err(dwc->dev, "failed to request irq #%d --> %d\n",

				irq, ret);
@@ -1636,7 +1636,7 @@ static int dwc3_gadget_start(struct usb_gadget *g, 
err1:

	spin_unlock_irqrestore(&dwc->lock, flags);



	free_irq(irq, dwc);

	free_irq(irq, dwc->ev_buf);



err0:

	return ret;
@@ -1659,7 +1659,7 @@ static int dwc3_gadget_stop(struct usb_gadget *g) 
	spin_unlock_irqrestore(&dwc->lock, flags);



	irq = platform_get_irq(to_platform_device(dwc->dev), 0);

	free_irq(irq, dwc);

	free_irq(irq, dwc->ev_buf);



	return 0;

}
@@ -2602,14 +2602,13 @@ static void dwc3_process_event_entry(struct dwc3 *dwc, 
	}

}



static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc)

static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)

{

	struct dwc3_event_buffer *evt;

	struct dwc3 *dwc = evt->dwc;

	irqreturn_t ret = IRQ_NONE;

	int left;

	u32 reg;



	evt = dwc->ev_buf;

	left = evt->count;



	if (!(evt->flags & DWC3_EVENT_PENDING))
@@ -2649,27 +2648,26 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc) 
	return ret;

}



static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)

static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)

{

	struct dwc3 *dwc = _dwc;

	struct dwc3_event_buffer *evt = _evt;

	struct dwc3 *dwc = evt->dwc;

	unsigned long flags;

	irqreturn_t ret = IRQ_NONE;



	spin_lock_irqsave(&dwc->lock, flags);

	ret = dwc3_process_event_buf(dwc);

	ret = dwc3_process_event_buf(evt);

	spin_unlock_irqrestore(&dwc->lock, flags);



	return ret;

}



static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc)

static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)

{

	struct dwc3_event_buffer *evt;

	struct dwc3 *dwc = evt->dwc;

	u32 count;

	u32 reg;



	evt = dwc->ev_buf;



	count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));

	count &= DWC3_GEVNTCOUNT_MASK;

	if (!count)
@@ -2686,11 +2684,11 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc) 
	return IRQ_WAKE_THREAD;

}



static irqreturn_t dwc3_interrupt(int irq, void *_dwc)

static irqreturn_t dwc3_interrupt(int irq, void *_evt)

{

	struct dwc3			*dwc = _dwc;

	struct dwc3_event_buffer	*evt = _evt;



	return dwc3_check_event_buf(dwc);

	return dwc3_check_event_buf(evt);

}



/**