linux-kernel - Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality.

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Date:   Tue, 18 Apr 2017 12:14:00 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Michel Dänzer <michel@...nzer.net>
Cc:     Ilia Mirkin <imirkin@...m.mit.edu>, amd-gfx@...ts.freedesktop.org,
        open list <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments
 in line with reality.

  Hi,

> > Quite true that this proves nothing. However one should note that
> > fbcon -> fbdev works,
> 
> BTW, this supports Gerd's patch, since the KMS fbdev emulation code uses
> e.g. DRM_FORMAT_XRGB8888 for depth/bpp 24/32, and the fbdev API uses
> native endian packed colour values.

Same is true for DRM_IOCTL_MODE_ADDFB, with depth/bpp 24/32 you'll get
DRM_FORMAT_XRGB8888 (only DRM_IOCTL_MODE_ADDFB2 allows userspace specify
fourcc formats directly).

cheers,
  Gerd