Stephan Gerhold 7094832b5a serial: msm: Configure correct working mode before starting earlycon ... The MSM UART DM controller supports different working modes, e.g. DMA or the "single-character mode", where all reads/writes operate on a single character rather than 4 chars (32-bit) at once. When using earlycon, __msm_console_write() always writes 4 characters at a time, but we don't know which mode the bootloader was using and we don't set the mode either. This causes garbled output if the bootloader was using the single-character mode, because only every 4th character appears in the serial console, e.g. "[ 00oni pi 000xf0[ 00i s 5rm9(l)l s 1 1 SPMTA 7:C 5[ 00A ade k d[ 00ano:ameoi .Q1B[ 00ac _idaM00080oo'" If the bootloader was using the DMA ("DM") mode, output would likely fail entirely. Later, when the full serial driver probes, the port is re-initialized and output works as expected. Fix this also for earlycon by clearing the DMEN register and reset+re-enable the transmitter to apply the change. This ensures the transmitter is in the expected state before writing any output. Cc: stable <stable@kernel.org> Fixes: 0efe729634 ("tty: serial: msm: Add earlycon support") Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20250408-msm-serial-earlycon-v1-1-429080127530@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-04-11 16:58:47 +02:00
..
8250	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
jsm	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
21285.c	serial: 21285: Use port lock wrappers	2023-09-18 11:18:08 +02:00
altera_jtaguart.c	serial: altera_jtaguart: Use KBUILD_MODNAME	2024-12-04 16:35:53 +01:00
altera_uart.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
amba-pl010.c	serial: amba-pl010: Switch to irq_get_nr_irqs()	2024-10-16 21:56:58 +02:00
amba-pl011.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
apbuart.c	serial: apbuart: fix console prompt on qemu	2024-01-04 16:21:06 +01:00
apbuart.h
ar933x_uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
arc_uart.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
atmel_serial.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
atmel_serial.h
bcm63xx_uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
clps711x.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
cpm_uart.c	TTY / Serial driver updates for 6.13-rc1	2024-11-30 09:03:16 -08:00
cpm_uart.h	serial: cpm_uart: Remove cpm_uart/ subdirectory	2023-08-04 15:08:30 +02:00
digicolor-usart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
dz.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
dz.h
earlycon-riscv-sbi.c	tty/serial: Add RISC-V SBI debug console based earlycon	2024-01-10 07:04:04 -08:00
earlycon-semihost.c
earlycon.c	init: Don't proxy console= to earlycon	2024-10-01 14:11:39 +02:00
esp32_acm.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
esp32_uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
fsl_linflexuart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
fsl_lpuart.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
icom.c	serial: icom: fix code format problems	2025-03-20 08:10:40 -07:00
imx_earlycon.c
imx.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
ip22zilog.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
ip22zilog.h
Kconfig	serial: tegra-utc: Add driver for Tegra UART Trace Controller (UTC)	2025-02-14 10:06:50 +01:00
kgdboc.c	Revert "tty/serial: Add kgdb_nmi driver"	2025-02-14 10:05:43 +01:00
lantiq.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
liteuart.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
lpc32xx_hs.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
ma35d1_serial.c	tty: serial: pl011: remove incorrect of_match_ptr annotation	2025-03-20 08:09:56 -07:00
Makefile	serial: tegra-utc: Add driver for Tegra UART Trace Controller (UTC)	2025-02-14 10:06:50 +01:00
max310x.c	tty: serial: max310x: convert to use maple tree register cache	2024-04-09 16:50:36 +02:00
max3100.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
mcf.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
men_z135_uart.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
meson_uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
milbeaut_usio.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
mpc52xx_uart.c	serial: mpc52xx_uart: Remove legacy PM hook	2025-02-04 14:38:32 +01:00
mps2-uart.c	serial: mps2-uart: Use port lock wrappers	2023-09-18 11:18:12 +02:00
msm_serial.c	serial: msm: Configure correct working mode before starting earlycon	2025-04-11 16:58:47 +02:00
mux.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
mvebu-uart.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
mxs-auart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
omap-serial.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
owl-uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
pch_uart.c	serial: pch_uart: Remove legacy PM hook	2025-02-04 14:38:36 +01:00
pic32_uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
pmac_zilog.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
pmac_zilog.h
pxa.c	serial: pxa: Use uart_prepare_sysrq_char().	2024-03-02 22:06:21 +01:00
qcom_geni_serial.c	Merge 6.12-rc4 into tty-next	2024-10-21 08:51:39 +02:00
rda-uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
rp2.c	serial: rp2: Replace deprecated PCI functions	2024-10-30 16:07:38 -05:00
sa1100.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
samsung_tty.c	tty: serial: samsung: Add Exynos8895 compatible	2024-11-04 02:02:45 +01:00
sb1250-duart.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
sc16is7xx_i2c.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
sc16is7xx_spi.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
sc16is7xx.c	serial: sc16is7xx: Fix IRQ number check behavior	2025-02-04 14:42:42 +01:00
sc16is7xx.h	serial: sc16is7xx: split into core and I2C/SPI parts (sc16is7xx_regcfg)	2024-04-11 14:08:08 +02:00
sccnxp.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +02:00
serial_base_bus.c	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
serial_base.h	serial: core: Add serial_base_match_and_update_preferred_console()	2024-07-04 15:41:44 +02:00
serial_core.c	TTY/Serial driver updates for 6.15-rc1	2025-04-02 18:17:33 -07:00
serial_ctrl.c	serial: core: Start managing serial controllers to enable runtime PM	2023-05-31 10:46:59 +01:00
serial_mctrl_gpio.c	serial: mctrl_gpio: split disable_ms into sync and no_sync APIs	2025-02-19 15:08:36 +01:00
serial_mctrl_gpio.h	serial: mctrl_gpio: split disable_ms into sync and no_sync APIs	2025-02-19 15:08:36 +01:00
serial_port.c	serial: port: Make ->iotype validation global in __uart_read_properties()	2025-02-04 14:44:44 +01:00
serial_txx9.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
serial-tegra.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sh-sci.c	treewide: Switch/rename to timer_delete[_sync]()	2025-04-05 10:30:12 +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	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sprd_serial.c	serial: sprd: Add support for sc9632	2024-11-13 15:14:17 +01:00
st-asc.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
stm32-usart.c	serial: stm32: do not deassert RS485 RTS GPIO prematurely	2025-03-20 08:30:44 -07:00
stm32-usart.h	serial: stm32: get FIFO size from hwcfg register	2024-01-27 19:04:11 -08:00
suncore.c
sunhv.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sunplus-uart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sunsab.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sunsab.h
sunsu.c	tty: sunsu: remove unused serial_icr_read()	2025-03-20 08:00:51 -07:00
sunzilog.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
sunzilog.h
tegra-tcu.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
tegra-utc.c	serial: tegra-utc: Add driver for Tegra UART Trace Controller (UTC)	2025-02-14 10:06:50 +01:00
timbuart.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
timbuart.h
uartlite.c	serial: Switch back to struct platform_driver::remove()	2024-10-11 08:13:28 +02:00
ucc_uart.c	TTY / Serial driver updates for 6.13-rc1	2024-11-30 09:03:16 -08:00
vt8500_serial.c	serial: vt8500: Use port lock wrappers	2023-09-18 11:18:16 +02:00
xilinx_uartps.c	serial: xilinx_uartps: Switch to use hrtimer_setup()	2025-02-20 15:38:34 +01:00
zs.c	tty: serial: switch from circ_buf to kfifo	2024-04-09 15:28:03 +02:00
zs.h