[Intel-gfx] [PATCH 1/3] drm/i915: fix hsw_fdi_link_train "retry" code

[Daniel Vetter]

On Thu, Nov 29, 2012 at 11:29:31AM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> We were previously doing exactly what the "mode set sequence for CRT"
> document mandates, but whenever we failed to train the link in the
> first tentative, all the other subsequent retries always failed. In
> one of my monitors that has 47 modes, I was usually getting around 3
> failures when running "testdisplay -a".
> 
> After this patch, even if we fail in the first tentative, we can
> succeed in the next ones. So now when running "testdisplay -a" I see
> around 3 times the message "FDI link training done on step 1" and no
> failures.
> 
> Notice that now the "retry" code looks a lot like the DP retry code.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Picked up for -fixes, thanks for the patch. Upon re-reading it still irks
me midly that the disable sequence here matches the begining of
ddi_post_disable. Whatever.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch