drm: add DRM_CAPs for cursor size

Some hardware may not support standard 64x64 cursors.  Add
a drm cap to query the cursor size from the kernel.  Some examples
include radeon CIK parts (128x128 cursors) and armada (32x64 or 64x32).
This allows things like device specific ddxes to remove asics specific
logic and also allows xf86-video-modesetting to work properly with hw
cursors on this hardware. Default to 64 if the driver doesn't specify
a size.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 3c9a833992e8..b06c8ed68707 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -619,6 +619,8 @@ struct drm_gem_open {
 #define  DRM_PRIME_CAP_EXPORT           0x2
 #define DRM_CAP_TIMESTAMP_MONOTONIC     0x6
 #define DRM_CAP_ASYNC_PAGE_FLIP         0x7
+#define DRM_CAP_CURSOR_WIDTH            0x8
+#define DRM_CAP_CURSOR_HEIGHT           0x9
 
 /** DRM_IOCTL_GET_CAP ioctl argument type */
 struct drm_get_cap {