VOLTAGE_DELAY_SEL  854 drivers/gpu/drm/radeon/r100d.h #define   VOLTAGE_DELAY_SEL(x)                         ((x) << 20)
VOLTAGE_DELAY_SEL  667 drivers/gpu/drm/radeon/rs600d.h #define   VOLTAGE_DELAY_SEL(x)                         ((x) << 3)