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isl: add gen12 comment about CCS for linear tiling

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Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3551>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3551>
This commit is contained in:
Lionel Landwerlin 2020-01-24 23:45:41 +02:00 • committed by Marge Bot
parent a3f6db2c4e
commit 8bd92a15cf
1 changed files with 10 additions and 0 deletions
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10
src/intel/isl/isl.c
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@ -2020,6 +2020,16 @@ isl_surf_get_ccs_surf(const struct isl_device *dev,
if (surf->tiling != ISL_TILING_Y0)
return false;
/* BSpec 44930:
*
* Linear CCS is only allowed for Untyped Buffers but only via HDC
* Data-Port messages.
*
* We probably want to limit linear CCS to storage usage and check that
* the shaders actually use only untyped messages.
*/
assert(surf->tiling != ISL_TILING_LINEAR);
switch (isl_format_get_layout(surf->format)->bpb) {
case 8: ccs_format = ISL_FORMAT_GEN12_CCS_8BPP_Y0; break;
case 16: ccs_format = ISL_FORMAT_GEN12_CCS_16BPP_Y0; break;