tree 97db2ad68cbe8543a12928812c7e8f94a95d09cc
parent 0c6d774c4d1775aba7281183b424fa0a0b1a3cf0
author Huang Shijie <b32955@freescale.com> 1400633788 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1401305986 -0700

serial: imx: reset the uart port all the time

Current code resets the uart port only when it supports the irda mode.
In actually, we also need to reset the uart port in the non-irda mode.
A hang was caught in the following case:

    UART A transmits data to the other end. But the transmission maybe
    terminated. In some corner case, the TX FIFO maybe not empty.

The kernel will hang at the imx_set_termios():
	............................................................
	while (!(readl(sport->port.membase + USR2) & USR2_TXDC))
		barrier();
	............................................................

This patch resets the uart port all the time in the imx_startup().
And fix the hang.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>