serial: stm32: fix incorrect characters on console

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[ Upstream commit f264c6f6ae ]

Incorrect characters are observed on console during boot. This issue occurs
when init/main.c is modifying termios settings to open /dev/console on the
rootfs.

This patch adds a waiting loop in set_termios to wait for TX shift register
empty (and TX FIFO if any) before stopping serial port.

Fixes: 48a6092fb4 ("serial: stm32-usart: Add STM32 USART Driver")
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Link: https://lore.kernel.org/r/20210304162308.8984-4-erwan.leray@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Erwan Le Ray 2021-03-04 17:22:58 +01:00 • committed by Greg Kroah-Hartman

parent a44d6acfa7

commit 5ca0d5b2c8

1 changed files with 11 additions and 1 deletions

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drivers/tty/serial/stm32-usart.c

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