[Intel-gfx] [PATCH] drm/i915: DP link training optimization

[Chris Wilson]

On Thu, Feb 26, 2015 at 11:26:10AM +0200, Mika Kahola wrote:
> In a case when DP link has been once trained we can reuse
> the existing link training parameters i.e. voltage swing
> and pre-emphasis levels from cache when there is a need to
> restart link training. In a case of eDP we initially try
> to train the link by using the parameter set that we can find
> from VBT. The fallback on both cases is to reset the link
> training parameters and restart.

I don't think the fallback from bad VBT values works as on failure they
just get reset. Care to enlighten me?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre