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Commit e8adfc30 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: gadget: get rid of IRQF_ONESHOT 



We can make use of bit 31 of the GEVNTSIZ(n)
registers to mask/unmask interrupts from that
particular interrupter.

With that feature, we can easily drop IRQF_ONESHOT
from our driver which makes it possible to
properly change IRQ priorities when using RT
patchset *and* it allows us to make use of the
scheduler to choose the proper time to handle
this IRQ thread.

Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 68d6a01b

drivers/usb/dwc3/gadget.c

+13 −1
Original line number Diff line number Diff line
@@ -1490,7 +1490,7 @@ 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 | IRQF_ONESHOT, "dwc3", dwc);

			IRQF_SHARED, "dwc3", dwc);

	if (ret) {

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

				irq, ret);
@@ -2447,6 +2447,7 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc) 
	struct dwc3 *dwc = _dwc;

	unsigned long flags;

	irqreturn_t ret = IRQ_NONE;

	u32 reg;

	int i;



	spin_lock_irqsave(&dwc->lock, flags);
@@ -2486,6 +2487,11 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc) 
		evt->count = 0;

		evt->flags &= ~DWC3_EVENT_PENDING;

		ret = IRQ_HANDLED;



		/* Unmask interrupt */

		reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(i));

		reg &= ~DWC3_GEVNTSIZ_INTMASK;

		dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(i), reg);

	}



	spin_unlock_irqrestore(&dwc->lock, flags);
@@ -2497,6 +2503,7 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) 
{

	struct dwc3_event_buffer *evt;

	u32 count;

	u32 reg;



	evt = dwc->ev_buffs[buf];
@@ -2508,6 +2515,11 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) 
	evt->count = count;

	evt->flags |= DWC3_EVENT_PENDING;



	/* Mask interrupt */

	reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));

	reg |= DWC3_GEVNTSIZ_INTMASK;

	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);



	return IRQ_WAKE_THREAD;

}