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Commit 5a9a8d1a authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Handle the no-interrupts case for UMS by polling 



If the driver calls into the kernel to wait for a breadcrumb to pass,
but hasn't enabled interrupts, fallback to polling the breadcrumb value.

Reported-by: default avatarChris Clayton <chris2553@googlemail.com>
Tested-by: default avatarChris Clayton <chris2553@googlemail.com>
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent 3885c6bb

drivers/gpu/drm/i915/i915_irq.c

+2 −2
Original line number Diff line number Diff line
@@ -1293,12 +1293,12 @@ static int i915_wait_irq(struct drm_device * dev, int irq_nr) 
	if (master_priv->sarea_priv)

		master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;



	ret = -ENODEV;

	if (ring->irq_get(ring)) {

		DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,

			    READ_BREADCRUMB(dev_priv) >= irq_nr);

		ring->irq_put(ring);

	}

	} else if (wait_for(READ_BREADCRUMB(dev_priv) >= irq_nr, 3000))

		ret = -EBUSY;



	if (ret == -EBUSY) {

		DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",