ATOM_TRASMITTER_CONFIG_V3_REFCLK_SRC_EXT 1356 drivers/gpu/drm/amd/include/atombios.h #define ATOM_TRASMITTER_CONFIG_V3_REFCLK_SRC_EXT            0x20
ATOM_TRASMITTER_CONFIG_V3_REFCLK_SRC_EXT 1150 drivers/gpu/drm/radeon/atombios.h #define ATOM_TRASMITTER_CONFIG_V3_REFCLK_SRC_EXT            0x20