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OpenCloudOS-Kernel/drivers/tty/serial
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Hugo Villeneuve 11244a4328 serial: sc16is7xx: fix bug in sc16is7xx_set_baud() when using prescaler 
[ Upstream commit 8492bd91aa055907c67ef04f2b56f6dadd1f44bf ]

When using a high speed clock with a low baud rate, the 4x prescaler is
automatically selected if required. In that case, sc16is7xx_set_baud()
properly configures the chip registers, but returns an incorrect baud
rate by not taking into account the prescaler value. This incorrect baud
rate is then fed to uart_update_timeout().

For example, with an input clock of 80MHz, and a selected baud rate of 50,
sc16is7xx_set_baud() will return 200 instead of 50.

Fix this by first changing the prescaler variable to hold the selected
prescaler value instead of the MCR bitfield. Then properly take into
account the selected prescaler value in the return value computation.

Also add better documentation about the divisor value computation.

Fixes: dfeae619d7 ("serial: sc16is7xx")
Cc: stable@vger.kernel.org
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240430200431.4102923-1-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-06-12 11:12:35 +02:00
..
8250 serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup 2024-06-12 11:11:18 +02:00
jsm drivers: serial: jsm: fix some leaks in probe 2022-09-22 16:11:43 +02:00
21285.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
Kconfig TTY/Serial driver updates for 6.5-rc1. 2023-07-03 13:14:58 -07:00
Makefile serial: cpm_uart: Remove cpm_uart/ subdirectory 2023-08-04 15:08:30 +02:00
altera_jtaguart.c serial: altera_jtaguart: switch status to u32 2023-07-31 17:16:05 +02:00
altera_uart.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
amba-pl010.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
amba-pl011.c serial: amba-pl011: Fix DMA transmission in RS485 mode 2024-03-01 13:35:02 +01:00
apbuart.c serial: apbuart: fix console prompt on qemu 2024-01-25 15:35:55 -08:00
apbuart.h
…
ar933x_uart.c serial: ar933x: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:25:52 +02:00
arc_uart.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
atmel_serial.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +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: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:25:52 +02:00
clps711x.c serial: clps711x: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:25:52 +02:00
cpm_uart.c serial: cpm_uart: Remove cpm_uart/ subdirectory 2023-08-04 15:08:30 +02:00
cpm_uart.h serial: cpm_uart: Remove cpm_uart/ subdirectory 2023-08-04 15:08:30 +02:00
digicolor-usart.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
dz.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
dz.h
…
earlycon-riscv-sbi.c serial: make uart_console_write->putchar()'s character an unsigned char 2022-03-03 15:06:31 +01:00
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
fsl_linflexuart.c serial: linflexuart: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:25:52 +02:00
fsl_lpuart.c tty: serial: fsl_lpuart: avoid idle preamble pending if CTS is enabled 2024-04-03 15:28:43 +02:00
icom.c serial: Make ->set_termios() old ktermios const 2022-08-30 14:22:35 +02:00
imx.c tty: serial: imx: Fix broken RS485 2024-04-03 15:28:42 +02:00
imx_earlycon.c serial: make uart_console_write->putchar()'s character an unsigned char 2022-03-03 15:06:31 +01:00
ip22zilog.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
ip22zilog.h
…
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 2024-05-25 16:22:54 +02:00
lantiq.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
liteuart.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
lpc32xx_hs.c tty: serial: use uart_port_tx() helper 2022-11-03 03:32:40 +01:00
ma35d1_serial.c serial: ma35d1: Validate console index before assignment 2023-12-13 18:45:31 +01:00
max310x.c serial: max310x: fix NULL pointer dereference in I2C instantiation 2024-04-03 15:28:16 +02:00
max3100.c serial: max3100: Fix bitwise types 2024-06-12 11:12:17 +02:00
mcf.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
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: fix hard LOCKUP on crtscts mode 2023-11-28 17:19:57 +00:00
milbeaut_usio.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
mpc52xx_uart.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
mps2-uart.c serial: mps2-uart: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:26:06 +02:00
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 devm_platform_get_and_ioremap_resource() 2023-07-25 20:26:07 +02:00
mxs-auart.c serial: mxs-auart: add spinlock around changing cts state 2024-04-27 17:11:39 +02:00
omap-serial.c serial: omap: do not override settings for RS485 support 2024-01-25 15:35:44 -08:00
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 tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
pmac_zilog.c serial/pmac_zilog: Remove flawed mitigation for rx irq flood 2024-04-27 17:11:39 +02:00
pmac_zilog.h serial: pmac_zilog: remove unused uart_pmac_port::termios_cache 2022-05-19 18:23:19 +02:00
pxa.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
qcom_geni_serial.c Revert "tty: serial: simplify qcom_geni_serial_send_chunk_fifo()" 2024-04-03 15:28:43 +02:00
rda-uart.c serial: rda: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
rp2.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
sa1100.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
samsung_tty.c tty: serial: samsung: fix tx_empty() to return TIOCSER_TEMT 2024-03-26 18:20:05 -04:00
sb1250-duart.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
sc16is7xx.c serial: sc16is7xx: fix bug in sc16is7xx_set_baud() when using prescaler 2024-06-12 11:12:35 +02:00
sccnxp.c serial: sccnxp: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:26:07 +02:00
serial-tegra.c serial: tegra: handle clk prepare error in tegra_uart_hw_init() 2023-08-22 15:29:18 +02:00
serial_base.h serial: core: Fix missing shutdown and startup for serial base port 2024-04-27 17:11:39 +02:00
serial_base_bus.c serial: core: Fix serial core port id, including multiport devices 2023-08-11 21:19:22 +02:00
serial_core.c serial: core: Fix missing shutdown and startup for serial base port 2024-04-27 17:11:39 +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 Documentation: serial: move GPIO kernel-doc to the functions 2022-07-28 10:37:42 +02:00
serial_mctrl_gpio.h serial: mctrl_gpio: add a new API to enable / disable wake_irq 2022-02-08 11:07:16 +01:00
serial_port.c serial: core: Fix missing shutdown and startup for serial base port 2024-04-27 17:11:39 +02:00
serial_txx9.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
sh-sci.c serial: sh-sci: protect invalidating RXDMA on shutdown 2024-06-12 11:12:30 +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: Add suspend and resume operations 2023-08-22 15:29:10 +02:00
sprd_serial.c serial: sprd: Fix DMA buffer leak issue 2023-07-30 13:53:55 +02:00
st-asc.c drivers:tty: fix return value check in asc_init_port 2023-07-30 13:53:19 +02:00
stm32-usart.c serial: stm32: Reset .throttled state in .startup() 2024-04-27 17:11:39 +02:00
stm32-usart.h serial: stm32: group dma pause/resume error handling into single function 2023-08-22 15:28:51 +02:00
suncore.c
…
sunhv.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
sunplus-uart.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
sunsab.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
sunsab.h
…
sunsu.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
sunzilog.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
sunzilog.h
…
tegra-tcu.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
timbuart.c serial: timbuart: Use uart_xmit_advance() 2022-11-03 03:35:43 +01:00
timbuart.h
…
uartlite.c tty: Explicitly include correct DT includes 2023-07-25 20:19:05 +02:00
ucc_uart.c serial: cpm_uart: Don't include fs_uart_pd.h when not needed 2023-08-04 15:08:55 +02:00
vt8500_serial.c serial: vt8500: Use devm_platform_get_and_ioremap_resource() 2023-07-25 20:26:06 +02:00
xilinx_uartps.c tty: serial: xilinx_uartps: Do not check for 0 return after calling platform_get_irq() 2023-08-04 15:06:01 +02:00
zs.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
zs.h
…