diff options
| author | Simon Ser <contact@emersion.fr> | 2020-11-13 17:21:35 +0000 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-11-13 17:29:47 -0500 |
| commit | 544645f2ec1af910284ebde00da2a6cfab7cc8c1 (patch) | |
| tree | 27a3e84025a6995fd7da15d34c59fe63840eb845 /include/uapi/drm | |
| parent | b7397bad74db7bd380b8eee9f1d97bbfe42bdd23 (diff) | |
drm/fourcc: add table describing AMD modifiers bit layout
The table describes how each bit in the u64 value is used. Explicitly
state which values a field can take if we have defines for them. Also
add a note when a field isn't always populated.
Forcing people to update the table when changing the bit layout should
make it more obvious when there's a mistake, I hope.
If we get to the point where the bit layout gets more complicated, it
might be worth it to split the table into multiple tables (e.g. one for
GFX8, one for GFX9+, and so on).
Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'include/uapi/drm')
| -rw-r--r-- | include/uapi/drm/drm_fourcc.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index ad772e7dd48f..bf03bce1e854 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -1114,6 +1114,25 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier) * * For multi-plane formats the above surfaces get merged into one plane for * each format plane, based on the required alignment only. + * + * Bits Parameter Notes + * ----- ------------------------ --------------------------------------------- + * + * 7:0 TILE_VERSION Values are AMD_FMT_MOD_TILE_VER_* + * 12:8 TILE Values are AMD_FMT_MOD_TILE_<version>_* + * 13 DCC + * 14 DCC_RETILE + * 15 DCC_PIPE_ALIGN + * 16 DCC_INDEPENDENT_64B + * 17 DCC_INDEPENDENT_128B + * 19:18 DCC_MAX_COMPRESSED_BLOCK Values are AMD_FMT_MOD_DCC_BLOCK_* + * 20 DCC_CONSTANT_ENCODE + * 23:21 PIPE_XOR_BITS Only for some chips + * 26:24 BANK_XOR_BITS Only for some chips + * 29:27 PACKERS Only for some chips + * 32:30 RB Only for some chips + * 35:33 PIPE Only for some chips + * 55:36 - Reserved for future use, must be zero */ #define AMD_FMT_MOD fourcc_mod_code(AMD, 0) |