linux-kernel - Re: [PATCH v6 0/8] drm: Support per-plane async flip configuration

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Message-ID: <lxfxqbax6azdpeamwm2qqv2tulgxrb7y3qzb4ir4myt6x5sqez@imd3yd5mbk7u>
Date: Fri, 14 Jun 2024 20:32:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: André Almeida <andrealmeid@...lia.com>
Cc: dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	nouveau@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org, kernel-dev@...lia.com, 
	Melissa Wen <mwen@...lia.com>, alexander.deucher@....com, christian.koenig@....com, 
	Simon Ser <contact@...rsion.fr>, Pekka Paalanen <ppaalanen@...il.com>, daniel@...ll.ch, 
	Daniel Stone <daniel@...ishbar.org>, 'Marek Olšák' <maraeo@...il.com>, 
	Dave Airlie <airlied@...il.com>, ville.syrjala@...ux.intel.com, Xaver Hugl <xaver.hugl@...il.com>, 
	Joshua Ashton <joshua@...ggi.es>, Michel Dänzer <michel.daenzer@...lbox.org>, 
	Sam Ravnborg <sam@...nborg.org>, Boris Brezillon <bbrezillon@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Nicolas Ferre <nicolas.ferre@...rochip.com>, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, Claudiu Beznea <claudiu.beznea@...on.dev>, 
	Jani Nikula <jani.nikula@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, 
	Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>
Subject: Re: [PATCH v6 0/8] drm: Support per-plane async flip configuration

On Fri, Jun 14, 2024 at 12:35:27PM GMT, André Almeida wrote:
> 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 function 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.
> 
> Patch 8 finally enables async flip on overlay planes for amdgpu.
> 
> Changes from v5:
> - Instead of enabling plane->async_flip in the common code, move it to driver
> code.
> - Enable primary plane async flip on every driver
> https://lore.kernel.org/dri-devel/20240612193713.167448-1-andrealmeid@igalia.com/
> 
> André Almeida (8):
>   drm/atomic: Allow userspace to use explicit sync with atomic async
>     flips
>   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/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/nouveau/dispnv04/crtc.c                 | 4 ++++
>  drivers/gpu/drm/nouveau/dispnv50/wndw.c                 | 4 ++++
>  drivers/gpu/drm/vc4/vc4_plane.c                         | 4 +++-

The main question is why only these drivers were updated.

>  include/drm/drm_plane.h                                 | 5 +++++
>  8 files changed, 29 insertions(+), 4 deletions(-)
> 
> -- 
> 2.45.2
> 

-- 
With best wishes
Dmitry