GEN2_CTRL_NUM_OF_LANES
reg &= ~GEN2_CTRL_NUM_OF_LANES(~0);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_1);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_2);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_4);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_8);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_16);
reg |= GEN2_CTRL_NUM_OF_LANES(GEN2_CTRL_NUM_OF_LANES_32);