linux-kernel - Re: [PATCH RESEND v9 1/2] drm/atomic: Let drivers decide which planes to async flip

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Message-ID: <y5vxaa3mwuhhrwn4etuxdvr6xemu4vprinp6lb75ch7a4amkdf@jajgfjczii7s>
Date: Sun, 3 Nov 2024 06:10:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: André Almeida <andrealmeid@...lia.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>, 
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>, Alex Deucher <alexander.deucher@....com>, 
	Christian König <christian.koenig@....com>, Xinhui Pan <Xinhui.Pan@....com>, Simon Ser <contact@...rsion.fr>, 
	joshua@...ggi.es, Xaver Hugl <xaver.hugl@...il.com>, 
	Daniel Stone <daniel@...ishbar.org>, ville.syrjala@...ux.intel.com, kernel-dev@...lia.com, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH RESEND v9 1/2] drm/atomic: Let drivers decide which
 planes to async flip

On Fri, Nov 01, 2024 at 03:23:47PM -0300, André Almeida wrote:
> Currently, DRM atomic uAPI allows only primary planes to be flipped
> asynchronously. However, each driver might be able to perform async
> flips in other different plane types. To enable drivers to set their own
> restrictions on which type of plane they can or cannot flip, use the
> existing atomic_async_check() from struct drm_plane_helper_funcs to
> enhance this flexibility, thus allowing different plane types to be able
> to do async flips as well.
> 
> In order to prevent regressions and such, we keep the current policy: we
> skip the driver check for the primary plane, because it is always
> allowed to do async flips on it.
> 
> Signed-off-by: André Almeida <andrealmeid@...lia.com>
> ---
> Changes from v8:
> - Rebased on top of 6.12-rc1
> ---
>  drivers/gpu/drm/drm_atomic_uapi.c | 39 +++++++++++++++++++++++++++++----------
>  1 file changed, 29 insertions(+), 10 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry