seems to reduce irq scheduling overhead (~5% or so) and improve
responsiveness.
Not 100% sure if this is safe (doing this in musb_gadget_queue()
seems to lock up everything).
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
spin_lock_irqsave(&musb->lock, flags);
spin_lock_irqsave(&musb->lock, flags);
- musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
- /* SOF is not enabled, but status is still often set */
- musb->int_usb &= ~MUSB_INTR_SOF;
- musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
- musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+ for (i = 0; i < 8; i++) {
+ musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+ /* SOF is not enabled, but status is still often set */
+ musb->int_usb &= ~MUSB_INTR_SOF;
+ musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+ musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
- if (musb->int_usb || musb->int_tx || musb->int_rx)
- retval = musb_interrupt(musb);
+ if (musb->int_usb || musb->int_tx || musb->int_rx)
+ retval = musb_interrupt(musb);
+ else
+ break;
+ }
spin_unlock_irqrestore(&musb->lock, flags);
spin_unlock_irqrestore(&musb->lock, flags);