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Message-ID: <d724ea14-bd35-4f02-88c2-f691691b0376@collabora.com>
Date: Tue, 17 Oct 2023 10:47:08 -0300
From: Helen Koike <helen.koike@...labora.com>
To: André Almeida <andrealmeid@...lia.com>,
dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Cc: pierre-eric.pelloux-prayer@....com,
'Marek Olšák' <maraeo@...il.com>,
Michel Dänzer <michel.daenzer@...lbox.org>,
Randy Dunlap <rdunlap@...radead.org>,
Pekka Paalanen <ppaalanen@...il.com>, kernel-dev@...lia.com,
alexander.deucher@....com, hwentlan@....com,
christian.koenig@....com, joshua@...ggi.es
Subject: Re: [PATCH v7 0/6] drm: Add support for atomic async page-flip
On 17/10/2023 06:28, 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.
> Thanks,
> André
>
> - User-space patch: https://github.com/Plagman/gamescope/pull/595
> - IGT tests: https://gitlab.freedesktop.org/andrealmeid/igt-gpu-tools/-/tree/atomic_async_page_flip
>
> 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 (4):
> drm: allow DRM_MODE_PAGE_FLIP_ASYNC for atomic commits
> drm: introduce DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP
> drm: introduce drm_mode_config.atomic_async_page_flip_not_supported
> amd/display: indicate support for atomic async page-flips on DC
>
> Documentation/gpu/drm-uapi.rst | 47 ++++++++++++
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 1 +
> drivers/gpu/drm/drm_atomic_uapi.c | 75 +++++++++++++++++--
> drivers/gpu/drm/drm_crtc_internal.h | 2 +-
> drivers/gpu/drm/drm_ioctl.c | 5 ++
> drivers/gpu/drm/drm_mode_object.c | 2 +-
> .../drm/i915/display/intel_display_driver.c | 1 +
> drivers/gpu/drm/nouveau/nouveau_display.c | 1 +
> include/drm/drm_mode_config.h | 11 +++
> include/uapi/drm/drm.h | 10 ++-
> include/uapi/drm/drm_mode.h | 9 +++
> 11 files changed, 155 insertions(+), 9 deletions(-)
>
Hello o/
Maybe it is not related (since there are a few years I don't work on
this) but this reminds me of
https://yhbt.net/lore/all/20190412125827.5877-1-helen.koike@collabora.com/T/
(just sharing for the sake of communication flow)
Regards,
Helen
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