panfrost: Fix Bifrost blend descriptor emission
Format conversion only works if the num_comps field is set to 4,
probably because the tile buffer always store those 4 components
internally.
Fixes: edd98aac3f16 ("panfrost: Add support for native wallpapering on Bifrost")
Fixes: 8389976b7c09 ("panfrost: XML-ify the blend descriptors")
Cc: 20.3 <mesa-stable>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7527>
(cherry picked from commit 35ae9408f2a6b2f6f307562e8adc33af95406f12)
4 files changed