From 5a9a8d1a99c617df82339456fbdd30d6ed3a856b Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Sun, 23 Jan 2011 13:03:24 +0000 Subject: [PATCH] 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 --- drivers/gpu/drm/i915/i915_irq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 98106b7efa8b..4b5a35c88bec 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", -- 2.34.1