linux-kernel - Re: [PATCH] drm/cirrus: rewrite and modernize driver.

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Date:   Wed, 03 Apr 2019 11:52:31 -0400
From:   Adam Jackson <ajax@...hat.com>
To:     Daniel Stone <daniel@...ishbar.org>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        Dave Airlie <airlied@...hat.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH] drm/cirrus: rewrite and modernize driver.

On Wed, 2019-04-03 at 16:15 +0100, Daniel Stone wrote:

> There's already a list of supported formats for each DRM plane, which
> you can get via drmModeGetPlane (being careful to enable universal
> planes so you can discover the primary plane). The same information is
> present in the 'IN_FORMATS' property, which is more difficult to parse
> but also tells you about modifiers.
> 
> modesetting already pulls all this out (at least in the atomic path)
> so we can reason about acceptable modifiers.

D'oh, I knew that. The problem then is modesetting isn't pulling that
info out early enough in PreInit. I'll consider that another case of
xorg/xserver#9 then.

- ajax