[Bug 100440] [GLK] [IGT] testdisplay -a shows corruption on HDMI 4k display

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https://bugs.freedesktop.org/show_bug.cgi?id=100440

--- Comment #20 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Luis Botello from comment #18)
> After testing testdisplay on HDMI I am getting "No Signal" on HDMI screen
> while test sets CRTC(36):[7]  2560x1440 60 2560 2608 2640 2720 1440 1443
> 1448 1481 0x9 0x40.
> 
> Also as additional info I am getting extra low performance while 3840x2160
> resolution is set on HDMI, and no signal if 2560x1440 resolution is set in
> UI.

These are different issues, so I went ahead and pushed the patch for the
corruption one.

commit 46649d8b6cb876e4f823e741d39959cf6e231e85
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
Date:   Mon Apr 24 13:47:18 2017 +0300

    drm/i915/glk: Don't allow 12 bpc when htotal is too big

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