Commit bfe8b573 authored Mar 28, 2014 by Lespiau, Damien Committed by Dave Airlie Apr 02, 2014

drm: Specify a bit more the DRM_CAP_CURSOR_{WIDTH, HEIGHT} caps



Earlier this week, there was a bit of confusion about those new
capabilities, to the point I think it's better to document the intention
and API contract.

The comment documents the current situation:
 - the radeon driver returns the only valid size for the hw
 - i915 returns the maximun cursor size
 - other drivers fall back to returning 64x64

The common contract is to return a valid cursor size.

Cc: Sagar Kamble <sagar.a.kamble@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

parent 05c63c2f

include/uapi/drm/drm.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -619,6 +619,15 @@ struct drm_gem_open {
		#define DRM_PRIME_CAP_EXPORT 0x2
		#define DRM_CAP_TIMESTAMP_MONOTONIC 0x6
		#define DRM_CAP_ASYNC_PAGE_FLIP 0x7
		/*
		* The CURSOR_WIDTH and CURSOR_HEIGHT capabilities return a valid widthxheight
		* combination for the hardware cursor. The intention is that a hardware
		* agnostic userspace can query a cursor plane size to use.
		*
		* Note that the cross-driver contract is to merely return a valid size;
		* drivers are free to attach another meaning on top, eg. i915 returns the
		* maximum plane size.
		*/
		#define DRM_CAP_CURSOR_WIDTH 0x8
		#define DRM_CAP_CURSOR_HEIGHT 0x9