drm/amd/display: Add IN_FORMATS_ASYNC support for planes

[Why]
The DRM core exposes an IN_FORMATS_ASYNC plane property describing the
set of format/modifier pairs that are valid for asynchronous (immediate)
page flips. amdgpu already advertises async page flip support via
mode_config.async_page_flip = true, but never implemented the
.format_mod_supported_async plane callback, so the IN_FORMATS_ASYNC
property was not created.

This inconsistency (advertising async flips while exposing IN_FORMATS but
no IN_FORMATS_ASYNC) causes userspace, such as igt-gpu-tools, to emit a
repeated warning during plane initialization, which in turn demotes many
otherwise passing KMS subtests to a WARN result.

[How]
Wire up .format_mod_supported_async to the existing
amdgpu_dm_plane_format_mod_supported callback so the async format list is
populated. amdgpu does not restrict async flips at the format/modifier
level: the async flip constraints are enforced at atomic check and commit
time and only require a fast update (no change to FB pitch, DCC state,
rotation or memory type) between the old and new buffers. Therefore the
set of formats/modifiers valid for async flips is identical to the
regular IN_FORMATS set, and the same callback can be reused.

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: James Lin <PingLei.Lin@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 8e2d7bbd6b184c0c1b0fe7cb404c9b5214d89931)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index e957657b06c78263c6f0b37b5304b39d5915b039..c7f8e08feaf4bfdbdf80420bc6812d8da4a56c06 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1859,6 +1859,7 @@ static const struct drm_plane_funcs dm_plane_funcs = {
        .atomic_duplicate_state = amdgpu_dm_plane_drm_plane_duplicate_state,
        .atomic_destroy_state = amdgpu_dm_plane_drm_plane_destroy_state,
        .format_mod_supported = amdgpu_dm_plane_format_mod_supported,
+       .format_mod_supported_async = amdgpu_dm_plane_format_mod_supported,
 #ifdef AMD_PRIVATE_COLOR
        .atomic_set_property = dm_atomic_plane_set_property,
        .atomic_get_property = dm_atomic_plane_get_property,