[PATCH 0/4] drm/amdgpu: Support DRM format modifiers on GFX6-8 (v2)

["Timur Kristóf" <timur.kristof@gmail.com>]

GFX6-8 are the oldest GPUs supported by the amdgpu
kernel driver, and the last ones that didn't support
DRM format modifiers until now.

On GFX6-8, the GFX block can only use pre-determined tiling
modes which are programmed by the kernel according to the
tiling mode table. The new modifiers encode all the details
needed for tiling on these GPUs.

For the exact details, see the commit message of:
"drm/fourcc: Add modifiers for AMD GFX6-8"

For a userspace implementation, see this Mesa MR:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41557
And for libdrm:
https://gitlab.freedesktop.org/mesa/libdrm/-/merge_requests/481

Supporting DRM format modifiers on GFX6-8 will
unblock many things in the Linux graphics ecosystem
that previously either didn't work on these GPUs
or had to implement fallbacks.
For example, compositors written in Vulkan or
compositors running on Zink, interop between
different APIs (eg. VAAPI / OpenGL / Vulkan) etc.

Timur Kristóf (4):
  drm/fourcc: Add modifiers for AMD GFX6-8
  drm/amdgpu: Convert tiling flags to modifiers on GFX6-8
  drm/amd/display: Support DRM format modifiers on GFX6-8
  drm/amd/display: Don't use tiling flags anymore

 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   | 111 +++++-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  29 +-
 .../amd/display/amdgpu_dm/amdgpu_dm_plane.c   | 337 ++++++++++++++++--
 .../amd/display/amdgpu_dm/amdgpu_dm_plane.h   |   3 -
 .../amdgpu_dm/tests/amdgpu_dm_plane_test.c    |  84 -----
 include/uapi/drm/drm_fourcc.h                 | 209 ++++++++++-
 6 files changed, 602 insertions(+), 171 deletions(-)

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2.55.0