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linux/drivers/tty/serial
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Johan Hovold 02d5364007 serial: amba-pl011: drop low-latency workaround 
Commit ead76f329f77 ("ARM: 6763/1: pl011: add optional RX DMA to PL011
v2") added RX DMA support and also reproduced the workaround for the
infamous low_latency behaviour of tty_flip_buffer_push() by dropping and
reacquiring the port lock during receive processing.

Since commit a9c3f68f3cd8 ("tty: Fix low_latency BUG"),
tty_flip_buffer_push() always schedules a work item to push data to the
line discipline and there's no need to keep any low_latency hacks around.

Note that the port lock is also dropped in the PIO path
(see pl011_rx_chars), but it is not clear whether this is still needed
by the DMA code added by the aforementioned commit.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210421095509.3024-6-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-22 12:09:24 +02:00
..
8250
serial: do not restore interrupt state in sysrq helper
2021-04-22 12:04:26 +02:00
cpm_uart
tty: cpm_uart, use port->flags instead of low_latency
2021-01-07 16:17:31 +01:00
jsm
Merge 5.12-rc6 into tty-next
2021-04-05 08:59:21 +02:00
21285.c
tty: serial: 21285: fix lockup on open
2020-10-28 13:39:14 +01:00
altera_jtaguart.c
serial: altera_jtaguart: drop low-latency workaround
2021-04-22 12:09:24 +02:00
altera_uart.c
serial: altera_uart: drop low-latency workaround
2021-04-22 12:09:24 +02:00
amba-pl010.c
serial: amba-pl010: drop low-latency workaround
2021-04-22 12:09:24 +02:00
amba-pl011.c
serial: amba-pl011: drop low-latency workaround
2021-04-22 12:09:24 +02:00
amba-pl011.h
…
apbuart.c
tty/serial: Migrate apbuart to use has_sysrq
2019-12-18 15:04:44 +01:00
apbuart.h
…
ar933x_uart.c
serial: ar933x_uart: disable clk on error handling path in probe
2020-11-12 09:41:07 +01:00
arc_uart.c
tty/serial: Migrate arc_uart to use has_sysrq
2019-12-18 15:04:45 +01:00
atmel_serial.c
Linux 5.9-rc3
2020-08-31 07:19:25 +02:00
atmel_serial.h
tty: serial: Use the correct style for SPDX License Identifier
2020-03-07 09:52:01 +01:00
bcm63xx_uart.c
Revert "tty: serial: bcm63xx: fix missing clk_put() in bcm63xx_uart"
2020-05-04 11:49:57 +02:00
clps711x.c
tty/serial: Migrate clps711x to use has_sysrq
2019-12-18 15:04:46 +01:00
digicolor-usart.c
…
dz.c
TTY/Serial driver updates for 5.6-rc1
2020-01-29 10:13:27 -08:00
dz.h
…
earlycon-arm-semihost.c
…
earlycon-riscv-sbi.c
…
earlycon.c
earlycon: simplify earlycon-table implementation
2020-12-04 15:49:48 +01:00
fsl_linflexuart.c
tty: serial: linflexuart: Remove unnecessary '|' operation and add error count
2020-11-06 17:12:30 +01:00
fsl_lpuart.c
serial: fsl_lpuart: Use of_device_get_match_data()
2021-01-20 18:48:15 +01:00
icom.c
module: remove never implemented MODULE_SUPPORTED_DEVICE
2021-03-17 13:16:18 -07:00
icom.h
tty: serial: Use the correct style for SPDX License Identifier
2020-03-07 09:52:01 +01:00
imx_earlycon.c
tty: serial: imx: add imx earlycon driver
2020-07-29 17:11:02 +02:00
imx.c
serial: imx: drop workaround for forced irq threading
2021-03-23 10:32:44 +01:00
ip22zilog.c
tty/serial: Migrate ip22zilog to use has_sysrq
2019-12-18 15:04:50 +01:00
ip22zilog.h
…
Kconfig
tty: serial: samsung_tty: Add support for Apple UARTs
2021-03-10 09:34:10 +01:00
kgdb_nmi.c
tty: do not check tty_unregister_driver's return value
2021-03-10 09:34:09 +01:00
kgdboc.c
Linux 5.8-rc6
2020-07-20 09:39:11 +02:00
lantiq.c
tty/serial/lantiq: convert comma to semicolon
2020-12-28 16:10:50 +01:00
liteuart.c
serial: liteuart: fix return value check in liteuart_probe()
2021-03-10 09:34:10 +01:00
lpc32xx_hs.c
tty: serial: lpc32xx_hs: Remove unused variable 'tmp'
2020-11-06 10:54:04 +01:00
Makefile
serial: ifx6x60: Remove driver for deprecated platform
2021-01-26 19:21:49 +01:00
max310x.c
tty: max310x: fix flexible_array.cocci warnings
2021-03-23 10:24:27 +01:00
max3100.c
tty_port: drop last traces of low_latency
2021-01-07 16:17:32 +01:00
mcf.c
serial: mcf: add sysrq capability
2020-10-05 13:32:30 +02:00
men_z135_uart.c
tty: serial, fix kernel-doc
2020-08-18 13:51:18 +02:00
meson_uart.c
tty: serial: meson: enable console as module
2020-12-11 17:14:22 +01:00
milbeaut_usio.c
tty/serial: Migrate milbeaut_usio to use has_sysrq
2019-12-18 15:04:51 +01:00
mpc52xx_uart.c
tty/serial: mpc52xx_uart: Don't zero port->sysrq
2019-12-18 15:04:52 +01:00
mps2-uart.c
…
msm_serial.c
tty: serial: msm_serial: Constify msm_uart_pops
2020-11-06 17:16:36 +01:00
mux.c
TTY/Serial driver updates for 5.6-rc1
2020-01-29 10:13:27 -08:00
mvebu-uart.c
serial: mvebu-uart: fix tx lost characters at power off
2020-12-28 16:17:34 +01:00
mxs-auart.c
serial: mxs-auart: Remove <asm/cacheflush.h>
2021-01-20 18:48:19 +01:00
omap-serial.c
serial: omap: fix rs485 half-duplex filtering
2021-04-22 12:07:07 +02:00
owl-uart.c
tty: serial: owl: Add support for kernel debugger
2021-01-13 17:16:54 +01:00
pch_uart.c
serial: pch_uart: fix build error with !CONFIG_DEBUG_FS
2021-03-23 10:31:09 +01:00
pic32_uart.c
serial: pic32_uart: Use uart_console() helper
2020-03-12 10:00:22 +01:00
pic32_uart.h
tty: serial: Use the correct style for SPDX License Identifier
2020-03-07 09:52:01 +01:00
pmac_zilog.c
m68k: Fix WARNING splat in pmac_zilog driver
2020-11-23 11:31:00 +01:00
pmac_zilog.h
tty: serial: pmac_zilog: Remove unused disposable variable 'garbage'
2020-11-13 15:28:27 +01:00
pxa.c
tty/serial: Migrate pxa to use has_sysrq
2019-12-18 15:04:57 +01:00
qcom_geni_serial.c
serial: do not restore interrupt state in sysrq helper
2021-04-22 12:04:26 +02:00
rda-uart.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
rp2.c
…
sa1100.c
serial: sa1100: use platform_get_resource()
2020-08-18 15:02:06 +02:00
samsung_tty.c
tty: serial: samsung_tty: remove spinlock flags in interrupt handlers
2021-03-23 10:20:38 +01:00
sb1250-duart.c
MIPS: Replace SIBYTE_1956_WAR by CONFIG_SB1_PASS_2_WORKAROUNDS
2020-09-07 22:24:51 +02:00
sc16is7xx.c
sc16is7xx: Defer probe if device read fails
2021-04-05 12:07:32 +02:00
sccnxp.c
tty/serial: Migrate sccnxp to use has_sysrq
2019-12-18 15:05:00 +01:00
serial_core.c
serial: core: return early on unsupported ioctls
2021-04-10 10:36:34 +02:00
serial_mctrl_gpio.c
serial: mctrl_gpio: Fix passing zero to 'ERR_PTR' warning
2020-11-06 17:12:05 +01:00
serial_mctrl_gpio.h
tty: serial: Use the correct style for SPDX License Identifier
2020-03-07 09:52:01 +01:00
serial_txx9.c
serial: txx9: add missing platform_driver_unregister() on error in serial_txx9_init
2020-11-06 17:24:41 +01:00
serial-tegra.c
tty: serial: serial-tegra: Provide some missing struct member descriptions
2020-11-06 10:54:05 +01:00
sh-sci.c
serial: sh-sci: remove obsolete latency workaround
2021-04-15 12:59:16 +02:00
sh-sci.h
serial: sh-sci: Drop unused include
2020-04-16 16:13:34 +02:00
sifive.c
riscv: Fix sifive serial driver
2021-01-07 18:02:13 -08:00
sprd_serial.c
serial: sprd: remove redundant sprd_port cleanup
2020-03-18 12:20:04 +01:00
st-asc.c
tty: st-asc: switch to using devm_gpiod_get()
2020-01-10 14:01:33 +01:00
stm32-usart.c
serial: stm32: defer sysrq processing
2021-04-22 12:04:26 +02:00
stm32-usart.h
tty/serial: Add rx-tx-swap OF option to stm32-usart
2021-04-05 12:06:52 +02:00
suncore.c
…
sunhv.c
Revert "serial: sunhv: Initialize lock for non-registered console"
2020-07-21 18:21:49 +02:00
sunsab.c
serial: sunsab: Return proper error code from console ->setup() hook
2020-06-25 14:21:28 +02:00
sunsab.h
…
sunsu.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
sunzilog.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
sunzilog.h
…
tegra-tcu.c
serial: Add missing MODULE_DEVICE_TABLE
2021-04-10 10:37:27 +02:00
timbuart.c
tty: timbuart: convert tasklets to use new tasklet_setup() API
2020-08-18 13:33:13 +02:00
timbuart.h
tty: serial: Use the correct style for SPDX License Identifier
2020-03-07 09:52:01 +01:00
uartlite.c
tty: serial: uartlite: Support probe deferral
2020-12-04 16:51:40 +01:00
ucc_uart.c
serial: ucc_uart: make qe_uart_set_mctrl() static
2020-09-16 13:14:58 +02:00
vr41xx_siu.c
tty/serial: Migrate vr41xx_siu to use has_sysrq
2019-12-18 15:05:09 +01:00
vt8500_serial.c
tty/serial: Migrate vt8500_serial to use has_sysrq
2019-12-18 15:05:09 +01:00
xilinx_uartps.c
tty: serial: xilinx_uartps: Supply description for missing member 'cts_override'
2020-11-06 10:54:05 +01:00
zs.c
TTY/Serial driver updates for 5.6-rc1
2020-01-29 10:13:27 -08:00
zs.h
…