Found it.
http://crosreview.com/391350

Miao, did you already try to upstream that patch?

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mcchou@, please update whether or not this patch has been upstreamed.

We tried to upstream it but it needed more work[1]. Not sure if it's still worth with the change to Newblue.

[1] https://marc.info/?l=linux-bluetooth&m=148660240011418&w=2