Marek Vasut 72b1ce9045 serial: stm32: Re-assert RTS/DE GPIO in RS485 mode only if more data are transmitted ... [ Upstream commit c47527cbcc ] The stm32_usart_transmit_chars() may be called with empty or stopped transmit queue, and no XON/OFF character pending. This can happen at the end of transmission, where this last call is used to either handle the XON/XOFF x_char, or disable TX interrupt if queue is empty or stopped. If that occurs, do not assert the RS485 RTS/DE GPIO anymore, as the GPIO would remain asserted past the end of transmission and that would block the RS485 bus after the transmission. Only assert the RS485 RTS/DE GPIO if there is either pending XON/XOFF x_char, or at least one character in running transmit queue. Fixes: d7c7671616 ("serial: stm32: Use TC interrupt to deassert GPIO RTS in RS485 mode") Signed-off-by: Marek Vasut <marex@denx.de> Link: https://lore.kernel.org/r/20230223042252.95480-2-marex@denx.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-05-11 23:00:31 +09:00
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hvc	hvc/xen: prevent concurrent accesses to the shared ring	2023-03-30 12:47:48 +02:00
ipwireless
serdev
serial	serial: stm32: Re-assert RTS/DE GPIO in RS485 mode only if more data are transmitted	2023-05-11 23:00:31 +09:00
vt	vc_screen: modify vcs_size() handling in vcs_read()	2023-03-11 13:57:30 +01:00
amiserial.c
ehv_bytechan.c
goldfish.c	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:25:31 +02:00
Kconfig
Makefile
mips_ejtag_fdc.c
moxa.c	tty: drivers/tty/, stop using tty_schedule_flip()	2022-07-29 17:25:31 +02:00
moxa.h
mxser.c
n_gsm.c	tty: n_gsm: fix sleep-in-atomic-context bug in gsm_control_send	2022-11-26 09:24:35 +01:00
n_hdlc.c
n_null.c
n_tty.c
nozomi.c
pty.c	tty: use new tty_insert_flip_string_and_push_buffer() in pty_write()	2022-07-29 17:25:32 +02:00
synclink_gt.c
sysrq.c
tty_audit.c
tty_baudrate.c
tty_buffer.c	tty: use new tty_insert_flip_string_and_push_buffer() in pty_write()	2022-07-29 17:25:32 +02:00
tty_io.c	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
tty_ioctl.c	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
tty_jobctrl.c
tty_ldisc.c
tty_ldsem.c
tty_mutex.c
tty_port.c
tty.h	tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH	2023-05-11 23:00:16 +09:00
ttynull.c
vcc.c