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Kernel 5.1-5.3 MCLK stuck at 167MHz Vega 10 (56/64)

Submitted by Anton Herzfeld

Assigned to Alex Deucher @agd5f

Link to original bug (#110777)

Description

Hi,

Since Kernel 5.1 up-to Kernel 5.2 my Vega 56 card's memory clock is stuck at 167MHz and does not boost up any more.
The exact same setup boosts fine to 1000MHz memclk when running Kernel 5.0.13.

Is there any info I can provide to get this fixed?