PORT_CMD_FIS_RX
tmp |= PORT_CMD_FIS_RX;
tmp &= ~PORT_CMD_FIS_RX;
writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));