ARM: meson: serial: tx_empty fails to check for transmitter busy

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The tx_empty() uart_op should only return empty if both the transmit fifo
and the transmit state-machine are both idle. Add a test for the hardware's
XMIT_BUSY flag.

Note, this is possibly related to an issue where the port is being shutdown
with paritally transmitted characters in it.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reported-by: Edward Cragg <edward.cragg@codethink.co.uk>
Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ben Dooks 2015-11-18 14:41:13 +00:00 • committed by Greg Kroah-Hartman

parent 00661dd855

commit 8867973901

1 changed files with 3 additions and 1 deletions

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drivers/tty/serial/meson_uart.c

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