[Intel-gfx] [PATCH v3] drm/i915/dp: Give up link training clock recovery after 10 failed attempts

[Marc Herbert]

>> I think the bug is with this infinite loop which is at the mercy of an external device
>> and in my case I have this MST hub which appears to be DP 1.2 that triggers the
>> infinite loop case. We have to limit the number of iterations and
>> DP 1.4 spec happened to fix this issue. I'm a newbie in this area but in this case
>> shouldn't we apply the same counter to all <= "DP 1.4" devices?
> 
> ok, the infinite loop situation is really bad... but I don't believe
> we are going with the right fix...
> and a good indication is that your fix is for DP-1.4 while your bug is seeing on DP-1.2

I thought the only reason the infinite loop fix isn't in 1.2 is just because there's
no 1.2.1 spec... (plus the naive assumption that buggy sinks don't exist)