[Bug 93217] [tonga] [powerplay] Radon M395X isn't initialised with the powerplay branch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93217

--- Comment #30 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Mike Lothian from comment #29)
> Would you like me to try re-enabling pcie dpm and use the new kernel
> parameters in drm-next-4.6-wip?

Yes, can you see what combinations of pcie_gen_cap and pcie_lane_cap help?  See
amd_pcie.h.

pcie_gen_cap:
bits 31:16 define the gen speeds supported by the platform (e.g., the
motherboard).  Setting it to CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3 (0x00040000)
would indicate that the motherboard only supports gen3 (not gen 2 or 1).
bits 15:0 define the pcie speeds supported by the GPU itself.  Setting this to
CAIL_ASIC_PCIE_LINK_SPEED_SUPPORT_GEN3 (0x00000004) means the asic only
supports gen 3.

pcie_lane_cap:
bits 31:16 define the link width supported by the platform.

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