drm/etnaviv: reduce number of ktime_get calls in IRQ handler

A single IRQ might signal the completion of multiple jobs/fences
at once. There is no point in attaching a new timestamp to each
fence that only differs in when exactly the IRQ handler was able
to process this fence.

Get a single timestamp when the IRQ handler has determined that
there are completed jobs and reuse this for all fences that get
signalled by the handler.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1548,6 +1548,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 	u32 intr = gpu_read(gpu, VIVS_HI_INTR_ACKNOWLEDGE);
 
 	if (intr != 0) {
+		ktime_t now = ktime_get();
 		int event;
 
 		pm_runtime_mark_last_busy(gpu->dev);
@@ -1597,7 +1598,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 			 */
 			if (fence_after(fence->seqno, gpu->completed_fence))
 				gpu->completed_fence = fence->seqno;
-			dma_fence_signal(fence);
+			dma_fence_signal_timestamp(fence, now);
 
 			event_free(gpu, event);
 		}