iop-adma: remove the workaround for missed interrupts on iop3xx

This workaround was covering the dependency submission bug in async_tx.

Signed-off-by: Dan Williams <[e-mail]>

drivers/dma/iop-adma.c

···
 
 	BUG_ON(!seen_current);
 
-	iop_chan_idle(busy, iop_chan);
-
 	if (cookie > 0) {
 		iop_chan->completed_cookie = cookie;
 		pr_debug("\tcompleted cookie %d\n", cookie);
···
 	}
 
 	spin_lock_init(&iop_chan->lock);
-	init_timer(&iop_chan->cleanup_watchdog);
-	iop_chan->cleanup_watchdog.data = (unsigned long) iop_chan;
-	iop_chan->cleanup_watchdog.function = iop_adma_tasklet;
 	INIT_LIST_HEAD(&iop_chan->chain);
 	INIT_LIST_HEAD(&iop_chan->all_slots);
 	INIT_RCU_HEAD(&iop_chan->common.rcu);

include/asm-arm/arch-iop13xx/adma.h

···
 	__raw_writel(adma_accr, ADMA_ACCR(chan));
 }
 
-static inline void iop_chan_idle(int busy, struct iop_adma_chan *chan)
-{
-	do { } while (0);
-}
-
 static inline u32 iop_chan_get_status(struct iop_adma_chan *chan)
 {
 	return __raw_readl(ADMA_ACSR(chan));

include/asm-arm/hardware/iop3xx-adma.h

···
 static inline void iop_chan_append(struct iop_adma_chan *chan)
 {
 	u32 dma_chan_ctrl;
-	/* workaround dropped interrupts on 3xx */
-	mod_timer(&chan->cleanup_watchdog, jiffies + msecs_to_jiffies(3));
 
 	dma_chan_ctrl = __raw_readl(DMA_CCR(chan));
 	dma_chan_ctrl |= 0x2;
 	__raw_writel(dma_chan_ctrl, DMA_CCR(chan));
-}
-
-static inline void iop_chan_idle(int busy, struct iop_adma_chan *chan)
-{
-	if (!busy)
-		del_timer(&chan->cleanup_watchdog);
 }
 
 static inline u32 iop_chan_get_status(struct iop_adma_chan *chan)

include/asm-arm/hardware/iop_adma.h

···
  * @common: common dmaengine channel object members
  * @last_used: place holder for allocation to continue from where it left off
  * @all_slots: complete domain of slots usable by the channel
- * @cleanup_watchdog: workaround missed interrupts on iop3xx
  * @slots_allocated: records the actual size of the descriptor slot pool
  * @irq_tasklet: bottom half where iop_adma_slot_cleanup runs
  */
···
 	struct dma_chan common;
 	struct iop_adma_desc_slot *last_used;
 	struct list_head all_slots;
-	struct timer_list cleanup_watchdog;
 	int slots_allocated;
 	struct tasklet_struct irq_tasklet;
 };