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

[Gerd Hoffmann]

  Hi,

> > My personal opinion is that formats in drm_fourcc.h should be 
> > independent of the CPU byte order and the function 
> > drm_mode_legacy_fb_format() and drivers depending on that incorrect 
> > assumption be fixed instead.
> 
> The problem is this isn't a kernel-internal thing any more.  With the
> addition of the ADDFB2 ioctl the fourcc codes became part of the
> kernel/userspace abi ...

Ok, added some printk's to the ADDFB and ADDFB2 code paths and tested a
bit.  Apparently pretty much all userspace still uses the ADDFB ioctl.
xorg (modesetting driver) does.  gnome-shell in wayland mode does.
Seems the big transition to ADDFB2 didn't happen yet.

I guess that makes changing drm_mode_legacy_fb_format + drivers a
reasonable option ...

cheers,
  Gerd