In order to use a custom pp_od_clk_voltage one has to set
power_dpm_force_performance_level to manual.

However this way it is not possible to use custom pp_od_clk_voltage and force -
for instance - high or peak performance levels.


The forcing of different performance levels doesn't (and shouldn't) relate to
custom clocks/voltages. Putting this setting in the same interface is a poor
choice and (unnecessarily) restricts the possibilities.


Please add a new sysfs interface for *solely* choosing between default and
custom pp_od_clk_voltage.