[Bug 90963] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

--- Comment #16 from Eong Chen <eong.chen at gmail.com> ---
(In reply to Ander Conselvan de Oliveira from comment #14)
> Created attachment 119060 [details] [review]
> Fallback to lower link rate on MST link training
> 
> Could you run a kernel with this patch and attach dmesg with debug from boot?
> 
> One difference between the link training in SST vs MST mode is that MST uses
> the highest rate, while in SST we try the lowest rate that supports the
> mode. The DP standard requires the source device to fallback to a lower rate
> if link training fails, but our code doesn't do that.

Tested it, please check the latest attached file.

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