drm/vkms: add support for multiple overlay planes
Create 8 overlay planes instead of 1 when the "enable_overlay" module
parameter is set.
The following igt-gpu-tools tests were executed without finding
regressions. Notice than the numbers are identical:
| master branch | this patch |
| SUCCESS | SKIP | FAIL | SUCCESS | SKIP | FAIL |
kms_atomic | 10 | 02 | 00 | 10 | 02 | 00 |
kms_plane_cursor | 09 | 45 | 00 | 09 | 45 | 00 |
kms_plane_multiple | 01 | 23 | 00 | 01 | 23 | 00 |
kms_writeback | 04 | 00 | 00 | 04 | 00 | 00 |
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220107182809.141003-2-jose.exposito89@gmail.com