[Bug 35970] HDMI TV interlaced modes slightly wrong.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35970

--- Comment #10 from Andy Furniss <adf.lists at gmail.com> ---
The commit in agd5f drm-next-4.1-wip -

2c1ecad111c82450d715929c12ac9511010d3b6c

drm/radeon: fix interlaced modes
The viewport needs the frame size, not the field size.

Makes things worse for me.

Before this patch testing with R9270X I see the same as I did with with an
HD4890 in that normal clock modes are almost OK apart from a bit of wrap
around/dup from bottom line to top, low res double clock modes = trash, but
then it's not implemented.

With this patch the screen is far more trashed = top 1/5 shredded and
displaying some of what is in rest of screen. Bottom 4/5 too dim but not
shredded.

FWIW I don't think my TV is "special" as recently I've tested with an intel
chip (bay trail) and all interlaced modes are correct with that.

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