[Bug 77009] 24P playback video signal loss with latest DRI patches

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77009

--- Comment #23 from Christian König <deathsimple at vodafone.de> ---
(In reply to comment #21)
> Created attachment 97043 [details]
> 368 and others dmesg
> 
> >Garrett, please stop trying to merge the patches. Since the initial change is >already upsteram we are going to need to fix it in a separate patch anyway.
> 
> Sorry.  New to this FOSS stuff.  OE is a complete OS download with local
> code not pulling from mainline kernels (from what I can tell).  It was
> tricky for me to patch it.  I am trying to be transparent so others can
> reproduce my results easily.

No problem at all and keeping it reproducible is indeed a good intention. I
just wanted to avoid that you spend time on unnecessary stuff.

> What I don't understand is the pll numbers go
> up and down, despite having the higher max vals.  This concerns me..

Well that is simple to explain. Assum that you have a feedback to ref divider
ratio of 100/11. This ratio can't be reduced any more without lossing
precission.

Now we also assume to the ref divider maximum is 10, so after limiting the ref
divider to 10 we end up with a ratio of 90/10. Now 90 to 10 can be reduced
easily to 9/1. So in the end we end up with a far lower ration because of the
reference divider limit.

> Hope it helps.

Yeah, your numbers indeed helped a bit, thanks.

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