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

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Message-ID: <20171214083539.o3wzr5h6yrodygvu@flea.lan>
Date:   Thu, 14 Dec 2017 09:35:39 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Thomas van Kleef <thomas@...sch.nl>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        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 Thomas,

On Wed, Dec 13, 2017 at 05:16:22PM +0100, Thomas van Kleef wrote:
> 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.

Yes :)

My current plan is to extend it as needed when we'll need to deal with
a format not supported by the backend (for the VPU), or anything the
backend cannot support.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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