AMD hardware can do async flips with overlay planes, but currently there's no
easy way to enable that in DRM. To solve that, this patchset creates a new
drm_plane field, bool async_flip, that allows drivers to choose which plane can
or cannot do async flips. This is latter used on drm_atomic_set_property when
users want to do async flips.

Patch 1 allows async commits with IN_FENCE_ID in any driver.

Patches 2 to 7 have no functional change. As per current code, every driver that
allows async page flips using the atomic API, allows doing it only in the
primary plane. Those patches then enable it for every driver.

Every driver that I found out capable of doing async flips were changed here.
The drivers that weren't touch don't have any mention to
mode_config::async_page_flip, so they are not currently advertising to userspace
that they can do async flips.

Patch 8 changes the current DRM uAPI check from allowing only primary planes to
allowing any plane that the driver allows flipping asynchronously.

Patch 9 finally enables async flip on overlay planes for amdgpu.

Changes from v6:
- Added async_flip check for i915/skl planes (Rodrigo)
- Commit the plane->async_flip check just after all driver had set their
async_flip capabilities (Dmitry)

Changes from v5:
- Instead of enabling plane->async_flip in the common code, move it to driver
- Enable primary plane async flip on every driver

André Almeida (9):
  drm/atomic: Allow userspace to use explicit sync with atomic async
  drm: Support per-plane async flip configuration
  drm/amdgpu: Enable async flips on the primary plane
  drm: atmel-hlcdc: Enable async flips on the primary plane
  drm/i915: Enable async flips on the primary plane
  drm/nouveau: Enable async flips on the primary plane
  drm/vc4: Enable async flips on the primary plane
  drm: Enable per-plane async flip check
  drm/amdgpu: Make it possible to async flip overlay planes

 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 2 ++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c         | 3 +++
 drivers/gpu/drm/drm_atomic_uapi.c                       | 8 +++++---
 drivers/gpu/drm/i915/display/i9xx_plane.c               | 3 +++
 drivers/gpu/drm/i915/display/skl_universal_plane.c      | 1 +
 drivers/gpu/drm/nouveau/dispnv04/crtc.c                 | 4 ++++
 drivers/gpu/drm/nouveau/dispnv50/wndw.c                 | 4 ++++
 drivers/gpu/drm/vc4/vc4_plane.c                         | 4 +++-
 include/drm/drm_plane.h                                 | 5 +++++
 9 files changed, 30 insertions(+), 4 deletions(-)


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