VOLTAGE_CONTROL_ID_LM64 5052 drivers/gpu/drm/amd/include/atombios.h #define VOLTAGE_CONTROL_ID_LM64               0x01                           //I2C control, used for R5xx Core Voltage
VOLTAGE_CONTROL_ID_LM64 4513 drivers/gpu/drm/radeon/atombios.h #define	VOLTAGE_CONTROL_ID_LM64								0x01									//I2C control, used for R5xx Core Voltage