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SubjectRe: [PATCH v9 0/4] drm: Add support for atomic async page-flip
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Hi André,
On 11/22/23 11:19, André Almeida wrote:
> Hi,
>
> This work from me and Simon adds support for DRM_MODE_PAGE_FLIP_ASYNC through
> the atomic API. This feature is already available via the legacy API. The use
> case is to be able to present a new frame immediately (or as soon as
> possible), even if after missing a vblank. This might result in tearing, but
> it's useful when a high framerate is desired, such as for gaming.
>
> Differently from earlier versions, this one refuses to flip if any prop changes
> for async flips. The idea is that the fast path of immediate page flips doesn't
> play well with modeset changes, so only the fb_id can be changed.
>
> Tested with:
> - Intel TigerLake-LP GT2
> - AMD VanGogh

Have you had a chance to test this with VRR enabled? Since, I suspect
this series might break that feature.

>
> Thanks,
> André
>
> - User-space patch: https://github.com/Plagman/gamescope/pull/595
> - IGT tests: https://lore.kernel.org/all/20231110163811.24158-1-andrealmeid@igalia.com/
>
> Changes from v8:
> - Dropped atomic_async_page_flip_not_supported, giving that current design works
> with any driver that support atomic and async at the same time.
> - Dropped the patch that disabled atomic_async_page_flip_not_supported for AMD.
> - Reordered commits
> v8: https://lore.kernel.org/all/20231025005318.293690-1-andrealmeid@igalia.com/
>
> Changes from v7:
> - Only accept flips to primary planes. If a driver support flips in different
> planes, support will be added later.
> v7: https://lore.kernel.org/dri-devel/20231017092837.32428-1-andrealmeid@igalia.com/
>
> Changes from v6:
> - Dropped the exception to allow MODE_ID changes (Simon)
> - Clarify what happens when flipping with the same FB_ID (Pekka)
>
> v6: https://lore.kernel.org/dri-devel/20230815185710.159779-1-andrealmeid@igalia.com/
>
> Changes from v5:
> - Add note in the docs that not every redundant attribute will result in no-op,
> some might cause oversynchronization issues.
>
> v5: https://lore.kernel.org/dri-devel/20230707224059.305474-1-andrealmeid@igalia.com/
>
> Changes from v4:
> - Documentation rewrote by Pekka Paalanen
>
> v4: https://lore.kernel.org/dri-devel/20230701020917.143394-1-andrealmeid@igalia.com/
>
> Changes from v3:
> - Add new patch to reject prop changes
> - Add a documentation clarifying the KMS atomic state set
>
> v3: https://lore.kernel.org/dri-devel/20220929184307.258331-1-contact@emersion.fr/
>
> André Almeida (1):
> drm: Refuse to async flip with atomic prop changes
>
> Pekka Paalanen (1):
> drm/doc: Define KMS atomic state set
>
> Simon Ser (2):
> drm: allow DRM_MODE_PAGE_FLIP_ASYNC for atomic commits
> drm: introduce DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP
>
> Documentation/gpu/drm-uapi.rst | 47 ++++++++++++++++++
> drivers/gpu/drm/drm_atomic_uapi.c | 77 ++++++++++++++++++++++++++---
> drivers/gpu/drm/drm_crtc_internal.h | 2 +-
> drivers/gpu/drm/drm_ioctl.c | 4 ++
> drivers/gpu/drm/drm_mode_object.c | 2 +-
> include/uapi/drm/drm.h | 10 +++-
> include/uapi/drm/drm_mode.h | 9 ++++
> 7 files changed, 142 insertions(+), 9 deletions(-)
>
--
Hamza

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