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usb: dwc3: gadget: use evt->cache for processing events

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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>
This commit is contained in:
John Youn 2016-11-15 13:07:02 +02:00 committed by Felipe Balbi
parent caefe6c7be
commit ebbb2d5939
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/dwc3/gadget.c
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@ -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;
}