[PATCH v3 0/6] Add support for atomic async page-flips

[Ville Syrjälä]

On Thu, Sep 29, 2022 at 06:43:15PM +0000, Simon Ser wrote:
> This series adds support for DRM_MODE_PAGE_FLIP_ASYNC for atomic
> commits, aka. "immediate flip" (which might result in tearing).
> The feature was only available via the legacy uAPI, however for
> gaming use-cases it may be desirable to enable it via the atomic
> uAPI too.
> 
> - Patchwork: https://patchwork.freedesktop.org/series/107683/
> - User-space patch: https://github.com/Plagman/gamescope/pull/595
> - IGT patch: https://patchwork.freedesktop.org/series/107681/

So no tests that actually verify that the kernel properly rejects
stuff stuff like modesets, gamma LUT updates, plane movement,
etc.?

> 
> Main changes in v2: add docs, fail atomic commit if async flip isn't
> possible.
> 
> Changes in v3: add a note in the documentation about Intel hardware,
> add R-b tags.
> 
> Tested on an AMD Picasso iGPU (Simon) and an AMD Vangogh GPU (André).
> 
> Simon Ser (6):
>   drm: document DRM_MODE_PAGE_FLIP_ASYNC
>   amd/display: only accept async flips for fast updates
>   drm: introduce drm_mode_config.atomic_async_page_flip_not_supported
>   drm: allow DRM_MODE_PAGE_FLIP_ASYNC for atomic commits
>   drm: introduce DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP
>   amd/display: indicate support for atomic async page-flips on DC
> 
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  8 ++++++
>  .../amd/display/amdgpu_dm/amdgpu_dm_crtc.c    | 10 +++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c  |  1 +
>  drivers/gpu/drm/drm_atomic_uapi.c             | 28 +++++++++++++++++--
>  drivers/gpu/drm/drm_ioctl.c                   |  5 ++++
>  drivers/gpu/drm/i915/display/intel_display.c  |  1 +
>  drivers/gpu/drm/nouveau/nouveau_display.c     |  1 +
>  drivers/gpu/drm/vc4/vc4_kms.c                 |  1 +
>  include/drm/drm_mode_config.h                 | 11 ++++++++
>  include/uapi/drm/drm.h                        | 10 ++++++-
>  include/uapi/drm/drm_mode.h                   | 16 +++++++++++
>  11 files changed, 88 insertions(+), 4 deletions(-)
> 
> -- 
> 2.37.3
> 

-- 
Ville Syrjälä
Intel