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author | Gabriel Matni <gabriel.matni@exfo.com> | 2018-03-22 19:15:12 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-22 21:27:44 +0100 |
commit | c685af1108d7c303f0b901413405d68eaeac4477 (patch) | |
tree | ea0d6e8358debb193b8eb233a0f019fe6ff152db /drivers/iio | |
parent | 7693b331d033ecda61097007330d3e7461ff7f27 (diff) | |
download | linux-c685af1108d7c303f0b901413405d68eaeac4477.tar.bz2 |
serial: mvebu-uart: fix tx lost characters
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 <miquel.raynal@bootlin.com>
Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Gabriel Matni <gabriel.matni@exfo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/iio')
0 files changed, 0 insertions, 0 deletions