linux-kernel - Re: [PATCH 0/8] drm/sun4i: Support the Display Engine frontend

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Message-ID: <407ed605-6c02-fae5-7cc8-e6119b26d49f@vitsch.nl>
Date:   Wed, 13 Dec 2017 17:16:22 +0100
From:   Thomas van Kleef <thomas@...sch.nl>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH 0/8] drm/sun4i: Support the Display Engine frontend

Hi,

On 13-12-17 16:33, Maxime Ripard wrote:
> Hi,
> 
> This is a first serie to enable the display engine frontend.
> 
> This hardware block is found in the first generation Display Engine from
> Allwinner. Its role is to implement more advanced features that the
> associated backend, even though the backend alone can be used (and was used
> so far) for basic composition.
> 
> Among those features, we will find hardware scaling, that is supported in
> this serie, colorspace conversions, or more exotic formats support such as
> the one output by the VPU.
So, if I have read the code correctly. The frontend will be used whenever the
input size differs from the output size.
> 
> Let me know what you think,
> Maxime
> 
> Maxime Ripard (8):
>   drm/sun4i: backend: Move line stride setup to buffer setup function
>   drm/sun4i: backend: Allow a NULL plane pointer to retrieve the format
>   drm/sun4i: sun4i_layer: Add a custom plane state
>   drm/sun4i: crtc: Add a custom crtc atomic_check
>   drm/sun4i: Add a driver for the display frontend
>   drm/sun4i: sun4i_layer: Wire in the frontend
>   drm/sun4i: sun4i_layer: Add a custom atomic_check for the frontend
>   ARM: dts: sun8i: a33 Enable our display frontend
> 
>  arch/arm/boot/dts/sun8i-a33.dtsi       |   1 +-
>  drivers/gpu/drm/sun4i/Makefile         |   3 +-
>  drivers/gpu/drm/sun4i/sun4i_backend.c  | 139 +++++++++-
>  drivers/gpu/drm/sun4i/sun4i_backend.h  |   6 +-
>  drivers/gpu/drm/sun4i/sun4i_crtc.c     |  14 +-
>  drivers/gpu/drm/sun4i/sun4i_drv.c      |  16 +-
>  drivers/gpu/drm/sun4i/sun4i_drv.h      |   1 +-
>  drivers/gpu/drm/sun4i/sun4i_frontend.c | 377 ++++++++++++++++++++++++++-
>  drivers/gpu/drm/sun4i/sun4i_frontend.h | 102 +++++++-
>  drivers/gpu/drm/sun4i/sun4i_layer.c    |  75 ++++-
>  drivers/gpu/drm/sun4i/sun4i_layer.h    |  11 +-
>  drivers/gpu/drm/sun4i/sunxi_engine.h   |   2 +-
>  12 files changed, 727 insertions(+), 20 deletions(-)
>  create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.c
>  create mode 100644 drivers/gpu/drm/sun4i/sun4i_frontend.h
> 
> base-commit: 4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323
>