[stable][PATCH backport to 3.8.y.z extended stable] drm/i915: Make data/link N value power of two

[Kamal Mostafa]

On Thu, 2013-08-15 at 05:57 +0800, Haitao Zhang wrote:
> This back ported patch fixed the following bug:
> Lenovo M4400s Screen will blink between normal and green
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1212376
> 

Thanks for the backport, Haitao.  I've queued it up for 3.8.13.7.

 -Kamal


> 
> commit a65851af59387146a28a928c3e7bb17dabc5db72 in upstream
> 
> [PATCH] drm/i915: Make data/link N value power of two 
> 
> The BIOS uses power of two values for the data/link N value.
> 
> Follow suit to make the Zotac DP to dual-HDMI dongle work.
> 
> v2: Clean up the magic numbers and defines
>     Change the N clamping to be a bit easier on the eye 
>     Rename intel_reduce_ratio to intel_reduce_m_n_ratio
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49402
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59810
> Tested-by:  Jesse Barnes <jbarnes at virtuousgeek.org>
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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