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linux/drivers/tty/serial
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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
..
8250 serial: 8250_tegra: Fix an error handling path in tegra_uart_probe() 2023-05-30 12:24:07 +01:00
cpm_uart serial: cpm_uart: Fix a COMPILE_TEST dependency 2023-05-30 12:25:47 +01:00
jsm drivers: serial: jsm: fix some leaks in probe 2022-09-22 16:11:43 +02:00
21285.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
altera_jtaguart.c tty: serial: altera_jtaguart: remove struct altera_jtaguart 2022-11-22 17:51:42 +01:00
altera_uart.c serial: altera_uart: fix locking in polling mode 2022-11-23 09:38:42 +01:00
amba-pl010.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
amba-pl011.c serial: amba-pl011: fix high priority character transmission in rs486 mode 2023-01-19 14:54:58 +01:00
apbuart.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
apbuart.h
ar933x_uart.c serial: ar933x: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
arc_uart.c serial: arc_uart: fix of_iomap leak in arc_serial_probe 2023-05-13 19:55:46 +09:00
atmel_serial.c serial: atmel: fix incorrect baudrate setup 2023-01-19 16:24:39 +01:00
atmel_serial.h tty: serial: atmel: Use FIELD_PREP/FIELD_GET 2022-09-22 16:32:25 +02:00
bcm63xx_uart.c serial: bcm63xx-uart: add polling support 2023-03-29 10:54:23 +02:00
clps711x.c serial: clps711x: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
digicolor-usart.c serial: digicolor: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
dz.c serial: dz: Use uart_xmit_advance() 2022-11-03 03:35:40 +01:00
dz.h
earlycon-riscv-sbi.c
earlycon-semihost.c serial: Rename earlycon semihost driver 2023-01-19 14:58:19 +01:00
earlycon.c earlycon: Let users set the clock frequency 2023-01-19 14:56:44 +01:00
fsl_linflexuart.c serial: linflexuart: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
fsl_lpuart.c tty: serial: fsl_lpuart: reduce RX watermark to 0 on LS1028A 2023-06-13 12:31:45 +02:00
icom.c serial: Make ->set_termios() old ktermios const 2022-08-30 14:22:35 +02:00
imx_earlycon.c
imx.c serial: imx: remove unused imx_uart_is_imx* functions 2023-03-29 10:53:46 +02:00
ip22zilog.c serial: ip22zilog: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
ip22zilog.h
Kconfig serial: cpm_uart: Fix a COMPILE_TEST dependency 2023-05-30 12:25:47 +01:00
kgdb_nmi.c
kgdboc.c tty: serial: kgdboc: fix mutex locking order for configure_kgdboc() 2023-01-16 16:44:53 +01:00
lantiq.c serial: lantiq: add missing interrupt ack 2023-06-06 14:45:34 +02:00
liteuart.c serial: liteuart: Remove a copy of UART id in private structure 2023-01-31 10:59:48 +01:00
lpc32xx_hs.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
Makefile serial: Rename earlycon semihost driver 2023-01-19 14:58:19 +01:00
max310x.c serial: max310x: fix IO data corruption in batched operations 2023-04-20 13:46:13 +02:00
max3100.c serial: Make uart_handle_cts_change() status param bool active 2023-01-19 16:04:35 +01:00
mcf.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
men_z135_uart.c serial: men_z135_uart: Use uart_xmit_advance() 2022-11-03 03:35:41 +01:00
meson_uart.c tty: serial: meson: Add a new compatible string for the G12A SoC 2023-03-09 17:21:02 +01:00
milbeaut_usio.c serial: milbeaut_usio: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
mpc52xx_uart.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
mps2-uart.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
msm_serial.c serial: msm: add lock annotation to msm_set_baud_rate() 2023-01-19 15:53:09 +01:00
mux.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
mvebu-uart.c serial: mvebu-uart: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
mxs-auart.c serial: Use of_property_read_bool() for boolean properties 2023-03-16 13:02:14 +01:00
omap-serial.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
owl-uart.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
pch_uart.c tty: pcn_uart: fix memory leak with using debugfs_lookup() 2023-02-08 13:09:55 +01:00
pic32_uart.c serial: pic32: Add checks for devm_clk_get() in pic32_uart_probe() 2023-01-19 16:02:23 +01:00
pmac_zilog.c serial: pmac_zilog: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
pmac_zilog.h serial: pmac_zilog: remove unused uart_pmac_port::termios_cache 2022-05-19 18:23:19 +02:00
pxa.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
qcom_geni_serial.c serial: qcom-geni: fix enabling deactivated interrupt 2023-05-13 20:00:54 +09:00
rda-uart.c serial: rda: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
rp2.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
sa1100.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
samsung_tty.c ARM: s3c: remove s3c24xx specific hacks 2023-01-16 09:26:05 +01:00
sb1250-duart.c serial: sb1250-duart: clean up after SIBYTE_BCM1x55 removal 2023-03-29 10:54:39 +02:00
sc16is7xx.c serial: sc16is7xx: Convert to i2c's .probe_new() 2023-03-09 21:58:53 +01:00
sccnxp.c serial: sccnxp: Use devm_clk_get_enabled() helper 2023-01-19 15:51:28 +01:00
serial_core.c serial: core: Disable uart_start() on uart_remove_one_port() 2023-04-20 13:43:44 +02:00
serial_mctrl_gpio.c Documentation: serial: move GPIO kernel-doc to the functions 2022-07-28 10:37:42 +02:00
serial_mctrl_gpio.h
serial_txx9.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
serial-tegra.c serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init() 2023-01-19 15:54:01 +01:00
sh-sci.c tty: serial: sh-sci: Fix end of transmission on SCI 2023-04-20 13:47:33 +02:00
sh-sci.h tty: serial: sh-sci: Add support for tx end interrupt handling 2023-04-20 13:47:33 +02:00
sifive.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
sprd_serial.c serial: sprd: Drop of_match_ptr for ID table 2023-03-16 13:02:17 +01:00
st-asc.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
stm32-usart.c serial: stm32: Re-assert RTS/DE GPIO in RS485 mode only if more data are transmitted 2023-03-09 17:16:11 +01:00
stm32-usart.h serial: stm32: Remove unused struct stm32_port txdone element 2023-03-09 17:16:11 +01:00
suncore.c
sunhv.c tty/serial: Make ->dcd_change()+uart_handle_dcd_change() status bool active 2023-01-19 16:04:35 +01:00
sunplus-uart.c serial: sunplus-uart: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
sunsab.c serial: sunsab: Fix error handling in sunsab_init() 2022-11-23 09:38:50 +01:00
sunsab.h
sunsu.c serial: sunsu: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
sunzilog.c serial: Use of_property_present() for testing DT property presence 2023-03-16 13:02:11 +01:00
sunzilog.h
tegra-tcu.c Merge 7e2cd21e02 ("Merge tag 'tty-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty") into tty-next 2022-09-25 09:22:13 +02:00
timbuart.c serial: timbuart: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
timbuart.h
uartlite.c serial: uartlite: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
ucc_uart.c serial: ucc_uart: Use uart_circ_empty() 2023-03-29 10:53:57 +02:00
vt8500_serial.c serial: Fix a typo ("ignorning") 2022-11-09 13:03:12 +01:00
xilinx_uartps.c TTY/Serial driver changes for 6.2-rc1 2022-12-16 03:31:56 -08:00
zs.c serial: zs: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
zs.h