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linux-stable/drivers/tty
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Robert Hodaszi a82c3df955 tty: serial: fsl_lpuart: reduce RX watermark to 0 on LS1028A 
LS1028A is using DMA with LPUART. Having RX watermark set to 1, means
DMA transactions are started only after receiving the second character.

On other platforms with newer LPUART IP, Receiver Idle Empty function
initiates the DMA request after the receiver is idling for 4 characters.
But this feature is missing on LS1028A, which is causing a 1-character
delay in the RX direction on this platform.

Set RX watermark to 0 to initiate RX DMA after each character.

Link: https://lore.kernel.org/linux-serial/20230607103459.1222426-1-robert.hodaszi@digi.com/
Fixes: 9ad9df8447 ("tty: serial: fsl_lpuart: Fix the wrong RXWATER setting for rx dma case")
Cc: stable <stable@kernel.org>
Signed-off-by: Robert Hodaszi <robert.hodaszi@digi.com>
Message-ID: <20230609121334.1878626-1-robert.hodaszi@digi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-13 12:31:45 +02:00
..
hvc xen: branch for v6.3-rc4 2023-03-24 09:44:43 -07:00
ipwireless
serdev serdev: Add method to assert break signal over tty UART port 2023-04-23 21:51:25 -07:00
serial tty: serial: fsl_lpuart: reduce RX watermark to 0 on LS1028A 2023-06-13 12:31:45 +02:00
vt vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF 2023-05-13 20:01:13 +09:00
amiserial.c tty: Convert hw_stopped in tty_struct to bool 2023-03-17 15:01:09 +01:00
ehv_bytechan.c
goldfish.c
Kconfig Char/Misc drivers for 6.4-rc1 2023-04-27 12:07:50 -07:00
Makefile
mips_ejtag_fdc.c
moxa.c
mxser.c tty: Convert hw_stopped in tty_struct to bool 2023-03-17 15:01:09 +01:00
n_gsm.c n_gsm: Use array_index_nospec() with index that comes from userspace 2023-04-20 14:11:33 +02:00
n_hdlc.c
n_null.c
n_tty.c n_tty: Reindent if condition 2023-03-17 15:01:09 +01:00
nozomi.c
pty.c tty: make tty_class a static const structure 2023-04-03 21:43:07 +02:00
rpmsg_tty.c
synclink_gt.c tty: synclink_gt: don't allocate and pass dummy flags 2023-04-20 13:32:53 +02:00
sysrq.c
tty.h tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH 2023-03-29 10:55:53 +02:00
tty_audit.c
tty_baudrate.c
tty_buffer.c
tty_io.c Driver core changes for 6.4-rc1 2023-04-27 11:53:57 -07:00
tty_ioctl.c tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH 2023-03-29 10:55:53 +02:00
tty_jobctrl.c
tty_ldisc.c tty: tty_ldisc: Remove the ret variable 2023-03-09 17:11:18 +01:00
tty_ldsem.c
tty_mutex.c
tty_port.c
ttynull.c
vcc.c