I found that here blame patch 201 efi-lockdown.patch.
I was build kernel with fedpkg without this patch and problem was gone.
# cat /sys/kernel/debug/dri/0/amdgpu_gca_config | xxd -e -
00000000: 00000003 00000004 00000004 00000010 ................
00000010: 00000001 00000004 00000010 00000100 ................
00000020: 00000020 00000008 00000020 00000100 ....... .......
00000030: 00000030 000004c0 00000000 0000ffff 0...............
00000040: 00000000 00000000 00000000 00000000 ................
00000050: 00000000 00000000 2a114042 00000010 ........B@.*....
00000060: 00000001 00000000 00fe9fcf 0000008d ................
00000070: 00000001 0000687f 000000c1 00002308 .....h.......#..
00000080: 00001458 X...
This patch needs fixing.