Pali Rohár 5eda5db39e serial: mvebu-uart: fix tx lost characters at power off ... commit 54ca955b5a upstream. Commit c685af1108 ("serial: mvebu-uart: fix tx lost characters") fixed tx lost characters at low baud rates but started causing tx lost characters when kernel is going to power off or reboot. TX_EMP tells us when transmit queue is empty therefore all characters were transmitted. TX_RDY tells us when CPU can send a new character. Therefore we need to use different check prior transmitting new character and different check after all characters were sent. This patch splits polling code into two functions: wait_for_xmitr() which waits for TX_RDY and wait_for_xmite() which waits for TX_EMP. When rebooting A3720 platform without this patch on UART is print only: [ 42.699� And with this patch on UART is full output: [ 39.530216] reboot: Restarting system Fixes: c685af1108 ("serial: mvebu-uart: fix tx lost characters") Signed-off-by: Pali Rohár <pali@kernel.org> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20201223191931.18343-1-pali@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-01-27 11:47:50 +01:00
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hvc	tty: hvcs: Don't NULL tty->driver_data until hvcs_cleanup()	2020-10-29 09:57:38 +01:00
ipwireless	tty: ipwireless: fix error handling	2020-10-29 09:58:08 +01:00
serdev	serdev: ttyport: restore client ops on deregistration	2020-02-28 17:22:19 +01:00
serial	serial: mvebu-uart: fix tx lost characters at power off	2021-01-27 11:47:50 +01:00
vt	vt: Disable KD_FONT_OP_COPY	2020-11-10 12:37:31 +01:00
Kconfig	…
Makefile	…
amiserial.c	…
cyclades.c	…
ehv_bytechan.c	tty: evh_bytechan: Fix out of bounds accesses	2020-04-23 10:36:44 +02:00
goldfish.c	…
isicom.c	…
mips_ejtag_fdc.c	…
moxa.c	…
moxa.h	…
mxser.c	…
mxser.h	…
n_gsm.c	tty: n_gsm: Fix bogus i++ in gsm_data_kick	2020-06-24 17:50:29 +02:00
n_hdlc.c	…
n_null.c	…
n_r3964.c	…
n_tracerouter.c	…
n_tracesink.c	…
n_tracesink.h	…
n_tty.c	…
nozomi.c	…
pty.c	pty: do tty_flip_buffer_push without port->lock in pty_write	2020-10-29 09:57:38 +01:00
rocket.c	tty: rocket, avoid OOB access	2020-04-29 16:33:17 +02:00
rocket.h	…
rocket_int.h	…
synclink.c	…
synclink_gt.c	tty: synclink_gt: Adjust indentation in several functions	2020-02-24 08:36:47 +01:00
synclinkmp.c	tty: synclinkmp: Adjust indentation in several functions	2020-02-24 08:36:47 +01:00
sysrq.c	…
tty_audit.c	…
tty_baudrate.c	…
tty_buffer.c	…
tty_io.c	tty: Fix ->session locking	2020-12-11 13:23:28 +01:00
tty_ioctl.c	…
tty_jobctrl.c	tty: Fix ->session locking	2020-12-11 13:23:28 +01:00
tty_ldisc.c	…
tty_ldsem.c	…
tty_mutex.c	…
tty_port.c	serdev: ttyport: restore client ops on deregistration	2020-02-28 17:22:19 +01:00
ttynull.c	…
vcc.c	sparc64: vcc: Fix error return code in vcc_probe()	2020-10-01 13:17:57 +02:00