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drm/i915: Add tiled framebuffer modifiers

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To be used from the new addfb2 extension.

v2:
- Drop Intel-specific untiled modfier.
- Move to drm_fourcc.h.
- Document layouts a bit and denote them as platform-specific and not
  useable for cross-driver sharing.
- Add Y-tiling for completeness.
- Drop special docstring markers to avoid confusing kerneldoc.

v3: Give Y-tiling a unique idea, noticed by Tvrtko.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> (v1)
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Tvrtko Ursulin 2015-02-10 17:16:05 +00:00 committed by Daniel Vetter
parent 35cb6f3b4e
commit 93b81f5102
2 changed files with 32 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
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@ -31,6 +31,7 @@
#define _I915_DRV_H_
#include <uapi/drm/i915_drm.h>
#include <uapi/drm/drm_fourcc.h>
#include "i915_reg.h"
#include "intel_bios.h"

31
include/uapi/drm/drm_fourcc.h
View File

@ -164,4 +164,35 @@
* authoritative source for all of these.
*/
/* Intel framebuffer modifiers */
/*
* Intel X-tiling layout
*
* This is a tiled layout using 4Kb tiles (except on gen2 where the tiles 2Kb)
* in row-major layout. Within the tile bytes are laid out row-major, with
* a platform-dependent stride. On top of that the memory can apply
* platform-depending swizzling of some higher address bits into bit6.
*
* This format is highly platforms specific and not useful for cross-driver
* sharing. It exists since on a given platform it does uniquely identify the
* layout in a simple way for i915-specific userspace.
*/
#define I915_FORMAT_MOD_X_TILED fourcc_mod_code(INTEL, 1)
/*
* Intel Y-tiling layout
*
* This is a tiled layout using 4Kb tiles (except on gen2 where the tiles 2Kb)
* in row-major layout. Within the tile bytes are laid out in OWORD (16 bytes)
* chunks column-major, with a platform-dependent height. On top of that the
* memory can apply platform-depending swizzling of some higher address bits
* into bit6.
*
* This format is highly platforms specific and not useful for cross-driver
* sharing. It exists since on a given platform it does uniquely identify the
* layout in a simple way for i915-specific userspace.
*/
#define I915_FORMAT_MOD_Y_TILED fourcc_mod_code(INTEL, 2)
#endif /* DRM_FOURCC_H */