static void dma_callback(void *client_data)
{
unsigned long flags;
spin_lock_irqsave(&camif_lock, flags);
snapshot_active = 0;
if (streaming_active) {
camif_cleanfifo();
camera_dma_regs->ccr |= DCCR_EN; // restart DMA
} else {
camif_mode_clear(EN_DMA | EN_FIFO_FULL);
}
spin_unlock_irqrestore(&camif_lock, flags);
#ifdef MEASURE_FR
if (dmac_delta) {
dmac_sum += machinecycles_to_usecs(do_getmachinecycles()
- dmac_delta);
dmac_N++;
}
dmac_delta = do_getmachinecycles();
#endif
// callback to V4L2 layer
capture_callback(callback_data);
EXIT();
}
int
get_arch_cycles(unsigned ref_jiffies)
{
extern unsigned long systimer_mark;
extern unsigned long do_getmachinecycles(void);
int ret;
unsigned temp_jiffies;
unsigned diff_jiffies;
do {
/* snapshot jiffies */
temp_jiffies = jiffies;
barrier();
/* calculate cycles since the current jiffy */
ret = do_getmachinecycles() - systimer_mark;
/* compensate for ref_jiffies in the past */
if (unlikely(diff_jiffies = jiffies - ref_jiffies))
ret += diff_jiffies * arch_cycles_per_jiffy;
barrier();
/* repeat if we didn't have a consistent view of the world */
} while(unlikely(temp_jiffies != jiffies));
return ret;
}
