From: Chris Wilson Date: Sun, 23 Jan 2011 13:03:24 +0000 (+0000) Subject: drm/i915: Handle the no-interrupts case for UMS by polling X-Git-Tag: upstream/snapshot3+hdmi~11448^2~4^2~20 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5a9a8d1a99c617df82339456fbdd30d6ed3a856b;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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: Chris Clayton Tested-by: Chris Clayton Signed-off-by: Chris Wilson --- diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 98106b7..4b5a35c 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -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",