drm/i915: add GETPARAM request for page flipping

Add a GETPARAM request for checking if page flipping is supported.
Useful for the 2D driver to enable the flipping path.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a8efe78e5c57..fe89d0c723e6 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -810,6 +810,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
         case I915_PARAM_HAS_OVERLAY:
                 value = dev_priv->overlay ? 1 : 0;
                 break;
+        case I915_PARAM_HAS_PAGEFLIPPING:
+                value = 1;
+                break;
         default:
                 DRM_DEBUG_DRIVER("Unknown parameter %d\n",
                                         param->param);