## wattman-like functionality
# boot with amdgpu.ppfeaturemask=0xffffffff (make sure PP_OVERDRIVE_MASK bit is set see hwmgr.h)
# see the current dpm clock and voltage levels
cat /sys/class/drm/card0/device/pp_od_clk_voltage
#OD_SCLK:
#0:        300Mhz        900 mV
#1:        484Mhz        925 mV
#2:        709Mhz        962 mV
#3:        858Mhz       1112 mV
#4:        891Mhz       1150 mV
#5:        917Mhz       1175 mV
#6:        949Mhz       1175 mV
#7:        973Mhz       1175 mV
#OD_MCLK:
#0:        150Mhz        900 mV
#1:       1375Mhz        975 mV
# change mclk dpm level 0 from 150 to 155Mhz, no change to voltage
# format is "m dpm_level clock_in_mhz voltage_in_mv"
echo "m 0 155 900" > /sys/class/drm/card0/device/pp_od_clk_voltage
# change sclk dpm level 7 from 973 to 975Mhz, change voltage from 1175 to 1180 mV
# format is "s dpm_level clock_in_mhz voltage_in_mv"
echo "s 7 975 1180" > /sys/class/drm/card0/device/pp_od_clk_voltage
# change sclk dpm level 5 from 917 to 910Mhz, change voltage from 1175 to 1160 mV
# format is "s dpm_level clock_in_mhz voltage_in_mv"
echo "s 7 910 1160" > /sys/class/drm/card0/device/pp_od_clk_voltage
# see the current dpm clock and voltage levels
cat /sys/class/drm/card0/device/pp_od_clk_voltage
#OD_SCLK:
#0:        300Mhz        900 mV
#1:        484Mhz        925 mV
#2:        709Mhz        962 mV
#3:        858Mhz       1112 mV
#4:        891Mhz       1150 mV
#5:        910Mhz       1160 mV
#6:        949Mhz       1175 mV
#7:        975Mhz       1180 mV
#OD_MCLK:
#0:        155Mhz        900 mV
#1:       1375Mhz        975 mV
# commit the changes to the hw
echo "c" > /sys/class/drm/card0/device/pp_od_clk_voltage
# reset to the default dpm states
echo "r" > /sys/class/drm/card0/device/pp_od_clk_voltage
# commit the reset state to the hw
echo "c" > /sys/class/drm/card0/device/pp_od_clk_voltage

## reading/adjusting hwmon values
# https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface
# see which hwmon device this is
cat /sys/class/hwmon/hwmon0/name
# readback current vddgfx/vddnb voltages
# see which one this is
cat /sys/class/hwmon/hwmon0/in0_label
# read the voltage (mV)
cat /sys/class/hwmon/hwmon0/in0_input
# see current power (microwatts)
cat /sys/class/hwmon/hwmon0/power1_average
# current temp (millidegrees C)
cat /sys/class/hwmon/hwmon0/temp1_input
# see fan speed (rpm)
cat /sys/class/hwmon/hwmon0/fan1_input
# see fan speed pwm (0-255)
cat /sys/class/hwmon/hwmon0/pwm1
# see min/max pwm limits
cat /sys/class/hwmon/hwmon0/pwm1_min
cat /sys/class/hwmon/hwmon0/pwm1_max
# see current fan control mode (0 none, 1 manual fan control, 2 dynamic fan control)
cat /sys/class/hwmon/hwmon0/pwm1_enable
# enable manual fan control
echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable
# manually set the fan speed (100/255 = 39%)
echo 100 > /sys/class/hwmon/hwmon0/pwm1
# enable automatic fan control
echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable