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dc98d76a15
linux/drivers/tty/serial
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Peng Fan dc98d76a15 tty: serial: fsl_lpuart: mark last busy before uart_add_one_port 
With "earlycon initcall_debug=1 loglevel=8" in bootargs, kernel
sometimes boot hang. It is because normal console still is not ready,
but runtime suspend is called, so early console putchar will hang
in waiting TRDE set in UARTSTAT.

The lpuart driver has auto suspend delay set to 3000ms, but during
uart_add_one_port, a child device serial ctrl will added and probed with
its pm runtime enabled(see serial_ctrl.c).
The runtime suspend call path is:
device_add
     |-> bus_probe_device
           |->device_initial_probe
	           |->__device_attach
                         |-> pm_runtime_get_sync(dev->parent);
			 |-> pm_request_idle(dev);
			 |-> pm_runtime_put(dev->parent);

So in the end, before normal console ready, the lpuart get runtime
suspended. And earlycon putchar will hang.

To address the issue, mark last busy just after pm_runtime_enable,
three seconds is long enough to switch from bootconsole to normal
console.

Fixes: 43543e6f53 ("tty: serial: fsl_lpuart: Add runtime pm support")
Cc: stable <stable@kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20240808140325.580105-1-peng.fan@oss.nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-13 11:05:19 +02:00
..
8250 TTY/Serial updates for 6.11-rc1 2024-07-19 15:22:14 -07:00
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: Convert to platform remove callback returning void 2023-11-23 19:12:30 +00:00
altera_uart.c tty/serial: altera_uart: use more informative labels in /proc/interrupts 2024-01-04 16:20:51 +01:00
amba-pl010.c serial: amba-pl010: Use port lock wrappers 2023-09-18 11:18:09 +02:00
amba-pl011.c serial: amba-pl011: move variable into CONFIG_DMA_ENGINE conditional 2024-04-09 17:07:10 +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: ar933x: Remove unneeded static structure 2024-04-09 17:07:10 +02:00
arc_uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
atmel_serial.c tty: atmel_serial: use single DMA mapping for RX 2024-04-09 15:28:04 +02:00
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: fix tx after conversion to uart_port_tx_limited() 2024-06-24 16:14:48 +02:00
clps711x.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
cpm_uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
cpm_uart.h serial: cpm_uart: Remove cpm_uart/ subdirectory 2023-08-04 15:08:30 +02:00
digicolor-usart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +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 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
esp32_acm.c tty: add missing MODULE_DESCRIPTION() macros 2024-06-24 16:10:11 +02:00
esp32_uart.c tty: add missing MODULE_DESCRIPTION() macros 2024-06-24 16:10:11 +02:00
fsl_linflexuart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
fsl_lpuart.c tty: serial: fsl_lpuart: mark last busy before uart_add_one_port 2024-08-13 11:05:19 +02:00
icom.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
imx_earlycon.c
imx.c TTY/Serial updates for 6.11-rc1 2024-07-19 15:22:14 -07:00
ip22zilog.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
ip22zilog.h
Kconfig serial: sc16is7xx: re-add Kconfig SPI or I2C dependency 2024-06-04 14:10:28 +02:00
kgdb_nmi.c tty: make tty_operations::write()'s count size_t 2023-08-11 21:12:46 +02:00
kgdboc.c serial: kgdboc: Fix NMI-safety problems from keyboard reset code 2024-04-26 17:14:10 +01:00
lantiq.c serial: lantiq: Convert to platform remove callback returning void 2023-11-23 19:12:32 +00:00
liteuart.c serial: liteuart: Convert to platform remove callback returning void 2023-11-23 19:12:32 +00:00
lpc32xx_hs.c serial: lpc32xx_hs: Use uart_prepare_sysrq_char() to handle sysrq. 2024-03-02 22:06:21 +01:00
ma35d1_serial.c tty: serial: ma35d1: Add a NULL check for of_node 2024-07-03 16:12:06 +02:00
Makefile serial: sc16is7xx: rename Kconfig CONFIG_SERIAL_SC16IS7XX_CORE 2024-06-04 14:10:28 +02:00
max310x.c tty: serial: max310x: convert to use maple tree register cache 2024-04-09 16:50:36 +02:00
max3100.c serial: max3100: Convert to_max3100_port() to be static inline 2024-04-11 14:08:40 +02:00
mcf.c tty: mcf: MCF54418 has 10 UARTS 2024-06-24 16:13:05 +02:00
men_z135_uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
meson_uart.c serial: meson+qcom: don't advance the kfifo twice 2024-04-16 09:05:43 +02:00
milbeaut_usio.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
mpc52xx_uart.c serial: mpc52xx: Convert to platform remove callback returning void 2023-11-23 19:12:32 +00:00
mps2-uart.c serial: mps2-uart: Use port lock wrappers 2023-09-18 11:18:12 +02:00
msm_serial.c serial: msm: check dma_map_sg() return value properly 2024-04-20 07:58:42 +02:00
mux.c tty: serial: use uart_port_tx_limited() 2022-11-03 03:32:40 +01:00
mvebu-uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
mxs-auart.c Merge 6.9-rc5 into tty-next 2024-04-23 13:24:45 +02:00
omap-serial.c serial: omap: remove redundant assignment to variable tmout 2024-04-11 14:08:36 +02:00
owl-uart.c tty: add missing MODULE_DESCRIPTION() macros 2024-06-24 16:10:11 +02:00
pch_uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
pic32_uart.c serial: pic32_uart: Replace of_gpio.h by proper one 2024-04-09 15:48:43 +02:00
pmac_zilog.c Merge 6.9-rc5 into tty-next 2024-04-23 13:24:45 +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 serial: qcom-geni: do not kill the machine on fifo underrun 2024-07-04 12:30:30 +02:00
rda-uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
rp2.c tty: rp2: remove unused rp2_uart_port::ignore_rx 2023-11-23 19:16:03 +00:00
sa1100.c serial: sa1100: Convert to platform remove callback returning void 2023-11-23 19:12:33 +00:00
samsung_tty.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sb1250-duart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sc16is7xx_i2c.c serial: sc16is7xx: split into core and I2C/SPI parts (sc16is7xx_regcfg) 2024-04-11 14:08:08 +02:00
sc16is7xx_spi.c serial: sc16is7xx: split into core and I2C/SPI parts (sc16is7xx_regcfg) 2024-04-11 14:08:08 +02:00
sc16is7xx.c serial: sc16is7xx: fix invalid FIFO access with special register set 2024-07-31 12:31:19 +02:00
sc16is7xx.h serial: sc16is7xx: split into core and I2C/SPI parts (sc16is7xx_regcfg) 2024-04-11 14:08:08 +02:00
sccnxp.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +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 serial: core: check uartclk for zero to avoid divide by zero 2024-07-31 12:30:06 +02:00
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 tty: add missing MODULE_DESCRIPTION() macros 2024-06-24 16:10:11 +02:00
serial_mctrl_gpio.h
serial_port.c serial: port: Don't block system suspend even if bytes are left to xmit 2024-06-04 14:09:47 +02:00
serial_txx9.c serial: txx9: Add missing #include <asm/txx9/generic.h> 2024-01-27 19:05:39 -08:00
serial-tegra.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sh-sci.c serial: sh-sci: Add support for RZ/V2H(P) SoC 2024-06-24 16:09:37 +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: sifive: Remove 0 from fu540-c000-uart0 binding. 2024-04-09 15:48:46 +02:00
sprd_serial.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
st-asc.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
stm32-usart.c Merge 6.9-rc5 into tty-next 2024-04-23 13:24:45 +02:00
stm32-usart.h serial: stm32: get FIFO size from hwcfg register 2024-01-27 19:04:11 -08:00
suncore.c
sunhv.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sunplus-uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sunsab.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sunsab.h
sunsu.c tty: sunsu: Simplify device_node cleanup by using __free 2024-06-04 14:00:16 +02:00
sunzilog.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
sunzilog.h
tegra-tcu.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
timbuart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
timbuart.h
uartlite.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
ucc_uart.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
vt8500_serial.c serial: vt8500: Use port lock wrappers 2023-09-18 11:18:16 +02:00
xilinx_uartps.c tty: serial: uartps: Add support for uartps controller reset 2024-05-04 18:11:05 +02:00
zs.c tty: serial: switch from circ_buf to kfifo 2024-04-09 15:28:03 +02:00
zs.h