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author | Eric Anholt <eric@anholt.net> | 2018-06-20 17:17:03 -0700 |
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committer | Eric Anholt <eric@anholt.net> | 2018-06-29 13:42:09 -0700 |
commit | 14d9deeb273c2bf4ec256589adabd8df65395d36 (patch) | |
tree | f8cea781ab00f3dffb7910f8b834a18e413c838f /include | |
parent | dff96888860a9ebaa618be973b51f4d86aec1211 (diff) | |
download | linux-14d9deeb273c2bf4ec256589adabd8df65395d36.tar.gz linux-14d9deeb273c2bf4ec256589adabd8df65395d36.tar.bz2 linux-14d9deeb273c2bf4ec256589adabd8df65395d36.zip |
drm/v3d: Define the fourcc modifier for the Broadcom UIF format.
This will be used by Mesa, and potentially other drivers in the
future, to describe tiled buffers.
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180621001703.13522-1-eric@anholt.net
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include')
-rw-r--r-- | include/uapi/drm/drm_fourcc.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index 64bf67abff7e..d5e52350a3aa 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -464,6 +464,27 @@ extern "C" { #define DRM_FORMAT_MOD_BROADCOM_SAND256 \ DRM_FORMAT_MOD_BROADCOM_SAND256_COL_HEIGHT(0) +/* Broadcom UIF format + * + * This is the common format for the current Broadcom multimedia + * blocks, including V3D 3.x and newer, newer video codecs, and + * displays. + * + * The image consists of utiles (64b blocks), UIF blocks (2x2 utiles), + * and macroblocks (4x4 UIF blocks). Those 4x4 UIF block groups are + * stored in columns, with padding between the columns to ensure that + * moving from one column to the next doesn't hit the same SDRAM page + * bank. + * + * To calculate the padding, it is assumed that each hardware block + * and the software driving it knows the platform's SDRAM page size, + * number of banks, and XOR address, and that it's identical between + * all blocks using the format. This tiling modifier will use XOR as + * necessary to reduce the padding. If a hardware block can't do XOR, + * the assumption is that a no-XOR tiling modifier will be created. + */ +#define DRM_FORMAT_MOD_BROADCOM_UIF fourcc_mod_code(BROADCOM, 6) + #if defined(__cplusplus) } #endif |