Rx vega m gl undervolt and overclock pp_od_clk_voltage values cannot be changed using echo

[James]

GPU=Rx vega m gl
Release=Focal, 20.04 (development)
xserver-xorg-video-amdgpu version=19.1.0-1 (active development)

/sys/class/drm/card1/device/pp_od_clk_voltage cannot be change beyond the parameters stated at the bottom of this file within the title OD_RANGE, as follows:

OD_RANGE:
SCLK: 225MHz 1011MHz
MCLK: 300MHz 700MHz
VDDC: 750mV 750mV

The parameters in OD_RANGE are too constrictive and do not allow practicable overclocking/undervolting. Please could these values be changed to the following?:

OD_RANGE:
SCLK: 225MHz 1500MHz
MCLK: 300MHz 850MHz
VDDC: 300mV 1500mV

This bug was also found here;
https://gitlab.freedesktop.org/drm/amd/issues/574

The voltages and clock speeds cannot be amended above 1011Mhz, the HBM2 cannot exceed 700MHz and all voltages can only equal 750mV.

[James (james9575)]

Following my previous post I have amended the above, to reflect that values can be changed, but only within constrictive ranges. Please amend these ranges to allow overclocking and undervolting.

[James (james9575)]

I have done some searching around and each of the OD_RANGE parameters, as they appear in PP_OD_CLK_VOLTAGE seem to be defined in lines 4495 to 4506 of linux/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c as follows:

linux/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c

As copied from file:
""
 case OD_RANGE:
  if (hwmgr->od_enabled) {
   size = sprintf(buf, "%s:\n", "OD_RANGE");
   size += sprintf(buf + size, "SCLK: %7uMHz %10uMHz\n",
    data->golden_dpm_table.sclk_table.dpm_levels[0].value/100,
    hwmgr->platform_descriptor.overdriveLimit.engineClock/100);
   size += sprintf(buf + size, "MCLK: %7uMHz %10uMHz\n",
    data->golden_dpm_table.mclk_table.dpm_levels[0].value/100,
    hwmgr->platform_descriptor.overdriveLimit.memoryClock/100);
   size += sprintf(buf + size, "VDDC: %7umV %11umV\n",
    data->odn_dpm_table.min_vddc,
    data->odn_dpm_table.max_vddc);
""

Hope this helps