Last commit made on 2018-07-24
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e10ddbb... by Gabriel Matni <email address hidden> on 2018-03-22

serial: mvebu-uart: fix tx lost characters

BugLink: http://bugs.launchpad.net/bugs/1783418

[ Upstream commit c685af1108d7c303f0b901413405d68eaeac4477 ]

Fixes missing characters on kernel console at low baud rates (i.e.9600).
The driver should poll TX_RDY or TX_FIFO_EMP instead of TX_EMP to ensure
that the transmitter holding register (THR) is ready to receive a new byte.

TX_EMP tells us when it is possible to send a break sequence via
SND_BRK_SEQ. While this also indicates that both the THR and the TSR are
empty, it does not guarantee that a new byte can be written just yet.

Fixes: 30530791a7a0 ("serial: mvebu-uart: initial support for Armada-3700 serial port")
Reviewed-by: Miquel Raynal <email address hidden>
Acked-by: Gregory CLEMENT <email address hidden>
Signed-off-by: Gabriel Matni <email address hidden>
Signed-off-by: Sasha Levin <email address hidden>
Signed-off-by: Greg Kroah-Hartman <email address hidden>
Signed-off-by: Kamal Mostafa <email address hidden>
Signed-off-by: Khalid Elmously <email address hidden>

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