LC_INITIATE_LINK_SPEED_CHANGE
speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
if ((speed_cntl & LC_INITIATE_LINK_SPEED_CHANGE) == 0)
tmp |= LC_INITIATE_LINK_SPEED_CHANGE;
tmp &= ~LC_INITIATE_LINK_SPEED_CHANGE;
speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
if ((speed_cntl & LC_INITIATE_LINK_SPEED_CHANGE) == 0)