Hi,
Which GPU generations/families do use the "new" powerplay CAC table, defined when the atombios platform capabilities have the ATOM_PP_PLATFORM_CAP_NEW_CAC_VOLTAGE flag?
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On drm-next-3.13 branch, commit 70471860ff9f335c60c004d42ebd48945bfa5403, I noticed the following: For the "new" power CAC table, there is a relationship with the table defining the link between vddc and the engine clock. My tahiti based board does use the "old" cac table, but I noticed the use of a virtual value (0xff??) for vddc in the vddc dependency on engine clock table which is not translated to a real voltage value.
This is found in si_dpm.c, si_get_std_voltage_value function.
Would that would explain why there are 2 lookup loops in si_get_std_voltage_value function? (one looking for the exact value, the other one seems to be a trick to deal with untranslated virtual voltage).
regards,