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linux/drivers/tty/serial
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Geert Uytterhoeven a9e4ee7f12 serial: sh-sci: Save and restore more registers 
commit 81100b9a7b upstream.

On (H)SCIF with a Baud Rate Generator for External Clock (BRG), there
are multiple ways to configure the requested serial speed.  If firmware
uses a different method than Linux, and if any debug info is printed
after the Bit Rate Register (SCBRR) is restored, but before termios is
reconfigured (which configures the alternative method), the system may
lock-up during resume.

Fix this by saving and restoring the contents of the BRG Frequency
Division (SCDL) and Clock Select (SCCKS) registers as well.

Also save and restore the HSCIF's Sampling Rate Register (HSSRR), which
configures the sampling point, and the SCIFA/SCIFB's Serial Port Control
and Data Registers (SCPCR/SCPDR), which configure the optional control
flow signals.

After this, all registers that are not saved/restored are either:
  - read-only,
  - write-only,
  - status registers containing flags with clear-after-set semantics,
  - FIFO Data Count Trigger registers, which do not matter much for
    the serial console.

Fixes: 22a6984c5b ("serial: sh-sci: Update the suspend/resume support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/r/11c2eab45d48211e75d8b8202cce60400880fe55.1741114989.git.geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-06-04 14:42:21 +02:00
..
8250 serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +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
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 build regression 2024-12-14 20:00:23 +01:00
apbuart.c serial: apbuart: fix console prompt on qemu 2024-01-25 15:35:55 -08:00
apbuart.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +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() 2024-07-05 09:34:00 +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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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: disable transmitter before changing RS485 related registers 2025-04-07 10:06:37 +02:00
icom.c serial: Make ->set_termios() old ktermios const 2022-08-30 14:22:35 +02:00
imx.c serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig TTY/Serial driver updates for 6.5-rc1. 2023-07-03 13:14:58 -07:00
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 2024-05-25 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 tty: serial: ma35d1: Add a NULL check for of_node 2024-07-18 13:21:21 +02:00
Makefile serial: cpm_uart: Remove cpm_uart/ subdirectory 2023-08-04 15:08:30 +02:00
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 tty: mcf: MCF54418 has 10 UARTS 2024-07-05 09:34:00 +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: Configure correct working mode before starting earlycon 2025-05-02 07:50:49 +02:00
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 serial: qcom-geni: fix receiver enable 2024-10-22 15:46:35 +02:00
rda-uart.c serial: rda: Use uart_xmit_advance() 2022-11-03 03:35:42 +01:00
rp2.c tty: rp2: Fix reset with non forgiving PCIe host bridges 2024-10-04 16:29:51 +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: use device_property APIs when configuring irda mode 2025-02-08 09:51:50 +01:00
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: protect uart_port_dtr_rts() in uart_shutdown() too 2024-10-17 15:24:19 +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 serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +02:00
serial_mctrl_gpio.h serial: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +02:00
serial_port.c serial: port: Always update ->iotype in __uart_read_properties() 2025-02-21 13:57:18 +01:00
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: Save and restore more registers 2025-06-04 14:42:21 +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: lock port in startup()/shutdown() callbacks 2025-05-02 07:50:49 +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: mctrl_gpio: split disable_ms into sync and no_sync APIs 2025-06-04 14:42:07 +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 tty: Use of_node_name_{eq,prefix} for node name comparisons 2018-12-17 16:12:17 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 tty: serial: Use the correct style for SPDX License Identifier 2020-03-07 09:52:01 +01:00
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: xilinx_uartps: split sysrq handling 2025-02-17 09:40:43 +01:00
zs.c serial: drivers: switch ch and flag to u8 2023-07-25 19:21:04 +02:00
zs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00