linux-kernel - Re: [PATCH v5 05/11] drm/sun4i: abstract a engine type

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Date:   Mon, 24 Apr 2017 11:05:00 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v5 05/11] drm/sun4i: abstract a engine type

Hi,

Thanks a lot for that work.

On Sun, Apr 23, 2017 at 06:37:48PM +0800, Icenowy Zheng wrote:
> As we are going to add support for the Allwinner DE2 engine in sun4i-drm
> driver, we will finally have two types of display engines -- the DE1
> backend and the DE2 mixer. They both do some display blending and feed
> graphics data to TCON, so I choose to call them both "engine" here.
> 
> Abstract the engine type to a new struct with an ops struct, which contains
> functions that should be called outside the engine-specified code (in
> TCON, CRTC or TV Encoder code).
> 
> A dedicated Kconfig option is also added to control whether
> sun4i-backend-specified code (sun4i_backend.c and sun4i_layer.c) should
> be built. As we removed the codes in CRTC code that directly call the
> layer code, we can now extract the layer part and combine it with the
> backend part into a new module, sun4i-backend.ko.

While the code itself is good now, the patch mixes a few things that
would be better to be split in separate patches. I think it would be
better if you had patches organized like this:
  - Abstract the engine type by create the sunxi_engine structure and
    fixing all the callers.
  - Move the layers and backend files in the same module, and remove
    the now useless EXPORT_SYMBOLS.
  - Create a Kconfig option.

Thanks!
Maxime

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

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