tree f2a7d13567afde1e4991c168617e23c10e397ade
parent 87838ae3affaa96f2cfc8c1147973de42e116b80
author Uwe Kleine-König <u.kleine-koenig@pengutronix.de> 1491297531 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1491670447 +0200

serial: imx: setup DCEDTE early and ensure DCD and RI irqs to be off

If the UART is operated in DTE mode and UCR3_DCD or UCR3_RI are 1 (which
is the reset default) and the opposite side pulls the respective line to
its active level the irq triggers after it is requested in .probe.

These irqs were already disabled in .startup but this might be too late.

Also setup of the UFCR_DCEDTE bit (currently done in .set_termios) is
done very late which is critical as it also controls direction of some
pins.

So setup UFCR_DCEDTE earlier (in .probe) and also disable the broken
irqs in DTE mode there before requesting irqs.

Acked-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>