serial: stm32: Add support of TC bit status check

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Adds a check on the Transmission Complete bit status before closing the
com port. Prevents the port closure before the end of the transmission.
TC poll loop is moved from stm32_tx_dma_complete to stm32_shutdown
routine, in order to check TC before shutdown in both dma and
PIO tx modes.
TC clear is added in stm32_transmit_char routine, in order to be cleared
before transmitting in both dma and PIO tx modes.

Fixes: 3489187204 ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Erwan Le Ray 2019-05-21 17:45:45 +02:00 • committed by Greg Kroah-Hartman

parent b83b957c91

commit 64c32eab66

1 changed files with 15 additions and 17 deletions

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32

drivers/tty/serial/stm32-usart.c

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