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* Merge tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxLinus Torvalds2023-11-101-7/+0
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull MIPS updates from Thomas Bogendoerfer: - removed AR7 platform support - cleanups and fixes * tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: MIPS: AR7: remove platform watchdog: ar7_wdt: remove driver to prepare for platform removal vlynq: remove bus driver mtd: parsers: ar7: remove support serial: 8250: remove AR7 support arch: mips: remove ReiserFS from defconfig MIPS: lantiq: Remove unnecessary include of <linux/of_irq.h> MIPS: lantiq: Fix pcibios_plat_dev_init() "no previous prototype" warning MIPS: KVM: Fix a build warning about variable set but not used MIPS: Remove dead code in relocate_new_kernel mips: dts: ralink: mt7621: rename to GnuBee GB-PC1 and GnuBee GB-PC2 mips: dts: ralink: mt7621: define each reset as an item mips: dts: ingenic: Remove unneeded probe-type properties MIPS: loongson32: Remove dma.h and nand.h
| * serial: 8250: remove AR7 supportWolfram Sang2023-10-191-7/+0
| | | | | | | | | | | | | | | | | | | | | | AR7 is going to be removed from the Kernel, so remove its type definition from 8250 code. As with previous removals, I checked with Debian Code Search that 'PORT_AR7' is not used in userspace. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
* | Merge tag 'tty-6.7-rc1' of ↵Linus Torvalds2023-11-0385-1541/+3081
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty and serial updates from Greg KH: "Here is the big set of tty/serial driver changes for 6.7-rc1. Included in here are: - console/vgacon cleanups and removals from Arnd - tty core and n_tty cleanups from Jiri - lots of 8250 driver updates and cleanups - sc16is7xx serial driver updates - dt binding updates - first set of port lock wrapers from Thomas for the printk fixes coming in future releases - other small serial and tty core cleanups and updates All of these have been in linux-next for a while with no reported issues" * tag 'tty-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (193 commits) serdev: Replace custom code with device_match_acpi_handle() serdev: Simplify devm_serdev_device_open() function serdev: Make use of device_set_node() tty: n_gsm: add copyright Siemens Mobility GmbH tty: n_gsm: fix race condition in status line change on dead connections serial: core: Fix runtime PM handling for pending tx vgacon: fix mips/sibyte build regression dt-bindings: serial: drop unsupported samsung bindings tty: serial: samsung: drop earlycon support for unsupported platforms tty: 8250: Add note for PX-835 tty: 8250: Fix IS-200 PCI ID comment tty: 8250: Add Brainboxes Oxford Semiconductor-based quirks tty: 8250: Add support for Intashield IX cards tty: 8250: Add support for additional Brainboxes PX cards tty: 8250: Fix up PX-803/PX-857 tty: 8250: Fix port count of PX-257 tty: 8250: Add support for Intashield IS-100 tty: 8250: Add support for Brainboxes UP cards tty: 8250: Add support for additional Brainboxes UC cards tty: 8250: Remove UC-257 and UC-431 ...
| * | serial: core: Fix runtime PM handling for pending txTony Lindgren2023-10-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Richard reported that a serial port may end up sometimes with tx data pending in the buffer for long periods of time. Turns out we bail out early on any errors from pm_runtime_get(), including -EINPROGRESS. To fix the issue, we need to ignore -EINPROGRESS as we only care about the runtime PM usage count at this point. We check for an active runtime PM state later on for tx. Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM") Cc: stable <stable@kernel.org> Reported-by: Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Bruce Ashfield <bruce.ashfield@gmail.com> Cc: Mikko Rapeli <mikko.rapeli@linaro.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Randy MacLeod <randy.macleod@windriver.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Richard Purdie <richard.purdie@linuxfoundation.org> Link: https://lore.kernel.org/r/20231023074856.61896-1-tony@atomide.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: samsung: drop earlycon support for unsupported platformsAndré Draszik2023-10-211-15/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 1ea35b355722 ("ARM: s3c: remove s3c24xx specific hacks") removed support here for several old platforms, but kept support for earlycon for those same platforms. As earlycon support for otherwise unsupported platforms doesn't seem to be useful, just drop it as well. Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: André Draszik <andre.draszik@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20231019100639.4026283-1-andre.draszik@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add note for PX-835Cameron Williams2023-10-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The PX-835 and PX-846 are variants of each other, clarify that in the comment for the card. This patch makes no functional difference. Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB78998840C2EBED91AABD4494C4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Fix IS-200 PCI ID commentCameron Williams2023-10-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the PCI comment for the IS-200 card. The PCI ID for the IS-200 is 0x0d80, and the definition used (PCI_DEVICE_ID_INTASHIELD_IS200) is indeed 0x0d80, clarify that by fixing the comment as its neighbouring cards are all at 0x0020 offsets. Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB78993B6AD85F6550AF6590FBC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add Brainboxes Oxford Semiconductor-based quirksCameron Williams2023-10-211-0/+147
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some of the later revisions of the Brainboxes PX cards are based on the Oxford Semiconductor chipset. Due to the chip's unique setup these cards need to be initialised. Previously these were tested against a reference card with the same broken baudrate on another PC, cancelling out the effect. With this patch they work and can transfer/receive find against an FTDI-based device. Add all of the cards which require this setup to the quirks table. Thanks to Maciej W. Rozycki for clarification on this chip. Fixes: ef5a03a26c87 ("tty: 8250: Add support for Brainboxes PX cards.") Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB7899D222A4AB2A4E8C57108FC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add support for Intashield IX cardsCameron Williams2023-10-211-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the IX-100, IX-200 and IX-400 serial cards. Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB7899614E5837E82A03272A4BC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add support for additional Brainboxes PX cardsCameron Williams2023-10-211-0/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for some more of the Brainboxes PX (PCIe) range of serial cards, namely PX-275/PX-279, PX-475 (serial port, not LPT), PX-820, PX-803/PX-857 (additional ID). Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB78996BEC353FB346FC35444BC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Fix up PX-803/PX-857Cameron Williams2023-10-211-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The PX-803/PX-857 are variants of each other, add a note. Additionally fix up the port counts for the card (2, not 1). Fixes: ef5a03a26c87 ("tty: 8250: Add support for Brainboxes PX cards.") Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB789978C8ED872FB4B014E132C4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Fix port count of PX-257Cameron Williams2023-10-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The port count of the PX-257 Rev3 is actually 2, not 4. Fixes: ef5a03a26c87 ("tty: 8250: Add support for Brainboxes PX cards.") Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB7899C804D9F04E727B5A0E8FC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add support for Intashield IS-100Cameron Williams2023-10-211-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the Intashield IS-100 1 port serial card. Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB7899A0E0CDAA505AF5A874CDC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add support for Brainboxes UP cardsCameron Williams2023-10-211-0/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the Brainboxes UP (powered PCI) range of cards, namely UP-189, UP-200, UP-869 and UP-880. Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB7899B5B59FF3D8587E88C117C4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Add support for additional Brainboxes UC cardsCameron Williams2023-10-211-0/+57
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add device IDs for some more Brainboxes UC cards, namely UC-235/UC-246, UC-253/UC-734, UC-302, UC-313, UC-346, UC-357, UC-607 and UC-836. Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB789969998A6C3FAFCD95C85DC4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: 8250: Remove UC-257 and UC-431Cameron Williams2023-10-211-8/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The UC-257 is a serial + LPT card, so remove it from this driver. A patch has been submitted to add it to parport_serial instead. Additionaly, the UC-431 does not use this card ID, only the UC-420 does. The 431 is a 3-port card and there is no generic 3-port configuration available, so remove reference to it from this driver. Fixes: 152d1afa834c ("tty: Add support for Brainboxes UC cards.") Cc: stable@vger.kernel.org Signed-off-by: Cameron Williams <cang1@live.co.uk> Link: https://lore.kernel.org/r/DU0PR02MB78995ADF7394C74AD4CF3357C4DBA@DU0PR02MB7899.eurprd02.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: 8250_omap: Set the console genpd always on if no console suspendThomas Richard2023-10-211-5/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the console suspend is disabled, the genpd of the console shall not be powered-off during suspend. Set the flag GENPD_FLAG_ALWAYS_ON to the corresponding genpd during suspend, and restore the original value during the resume. Signed-off-by: Thomas Richard <thomas.richard@bootlin.com> Link: https://lore.kernel.org/r/20231017130540.1149721-1-thomas.richard@bootlin.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: 8250: Add support for MOXA Mini PCIe boardsCrescent CY Hsieh2023-10-211-0/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for MOXA Mini PCIe serial boards: - CP102N: 2 ports | RS232 - CP104N: 4 ports | RS232 - CP112N: 2 ports | RS232/RS422/RS485 - CP114N: 4 ports | RS232/RS422/RS485 - CP132N: 2 ports | RS422/RS485 - CP134N: 4 ports | RS422/RS485 Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20231018091739.10125-5-crescentcy.hsieh@moxa.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: 8250: Relocate macros within 8250_pci.cCrescent CY Hsieh2023-10-211-72/+72
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move PCI_DEVICE_ID macros to the top so that these macros can be used throughout 8250_pci.c Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20231018091739.10125-4-crescentcy.hsieh@moxa.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: 8250: Cleanup MOXA configurationsCrescent CY Hsieh2023-10-211-36/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To improve clarity, clean up the MOXA configurations within serial_pci_tbl using PCI_VDEVICE(). Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20231018091739.10125-3-crescentcy.hsieh@moxa.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: 8250: Modify MOXA enum name within 8250_pci.cCrescent CY Hsieh2023-10-211-18/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | To improve clarity, modify the MOXA enum name within pci_board_num_t. Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20231018091739.10125-2-crescentcy.hsieh@moxa.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: samsung_tty: remove dead codeAndré Draszik2023-10-211-105/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When support for various old platforms was removed in commit 1ea35b355722 ("ARM: s3c: remove s3c24xx specific hacks"), s3c24xx_serial_ops also became unused here because nothing sets port type TYPE_S3C24XX anymore. Remove s3c24xx_serial_ops and all the code that's unreachable now. Fixes: 1ea35b355722 ("ARM: s3c: remove s3c24xx specific hacks") Signed-off-by: André Draszik <andre.draszik@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20231019100901.4026680-1-andre.draszik@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial/esp32_uart: use prescaler when availableMax Filippov2023-10-211-3/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | esp32s3 variant of the esp32 UART has limited baudrate divisor range that does not allow it to use 9600 and lower rates with 40MHz input clock. Use clock prescaler present in this UART variant to help with that. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Link: https://lore.kernel.org/r/20231018191252.1551972-1-jcmvbkbc@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | tty: serial: meson: fix hard LOCKUP on crtscts modePavel Krasavin2023-10-171-3/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There might be hard lockup if we set crtscts mode on port without RTS/CTS configured: # stty -F /dev/ttyAML6 crtscts; echo 1 > /dev/ttyAML6; echo 2 > /dev/ttyAML6 [ 95.890386] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 95.890857] rcu: 3-...0: (201 ticks this GP) idle=e33c/1/0x4000000000000000 softirq=5844/5846 fqs=4984 [ 95.900212] rcu: (detected by 2, t=21016 jiffies, g=7753, q=296 ncpus=4) [ 95.906972] Task dump for CPU 3: [ 95.910178] task:bash state:R running task stack:0 pid:205 ppid:1 flags:0x00000202 [ 95.920059] Call trace: [ 95.922485] __switch_to+0xe4/0x168 [ 95.925951] 0xffffff8003477508 [ 95.974379] watchdog: Watchdog detected hard LOCKUP on cpu 3 [ 95.974424] Modules linked in: 88x2cs(O) rtc_meson_vrtc Possible solution would be to not allow to setup crtscts on such port. Tested on S905X3 based board. Fixes: ff7693d079e5 ("ARM: meson: serial: add MesonX SoC on-chip uart driver") Cc: stable@vger.kernel.org Signed-off-by: Pavel Krasavin <pkrasavin@imaqliq.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Dmitry Rokosov <ddrokosov@salutedevices.com> v6: stable tag added v5: https://lore.kernel.org/lkml/OF43DA36FF.2BD3BB21-ON00258A47.005A8125-00258A47.005A9513@gdc.ru/ added missed Reviewed-by tags, Fixes tag added according to Dmitry and Neil notes v4: https://lore.kernel.org/lkml/OF55521400.7512350F-ON00258A47.003F7254-00258A47.0040E15C@gdc.ru/ More correct patch subject according to Jiri's note v3: https://lore.kernel.org/lkml/OF6CF5FFA0.CCFD0E8E-ON00258A46.00549EDF-00258A46.0054BB62@gdc.ru/ "From:" line added to the mail v2: https://lore.kernel.org/lkml/OF950BEF72.7F425944-ON00258A46.00488A76-00258A46.00497D44@gdc.ru/ braces for single statement removed according to Dmitry's note v1: https://lore.kernel.org/lkml/OF28B2B8C9.5BC0CD28-ON00258A46.0037688F-00258A46.0039155B@gdc.ru/ Link: https://lore.kernel.org/r/OF66360032.51C36182-ON00258A48.003F656B-00258A48.0040092C@gdc.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | drivers/tty/serial: add ESP32S3 ACM gadget driverMax Filippov2023-10-163-0/+473
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add driver for the ACM gadget controller of the Espressif ESP32S3 SoC. Hardware specification is available at the following URL: https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf (Chapter 33 USB Serial/JTAG Controller) Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Link: https://lore.kernel.org/r/20231010085926.1021667-6-jcmvbkbc@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | drivers/tty/serial: add driver for the ESP32 UARTMax Filippov2023-10-163-0/+755
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add driver for the UART controllers of the Espressif ESP32 and ESP32S3 SoCs. Hardware specification is available at the following URLs: https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf (Chapter 13 UART Controller) https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf (Chapter 26 UART Controller) Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Link: https://lore.kernel.org/r/20231010085926.1021667-4-jcmvbkbc@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: core: tidy invalid baudrate handling in uart_get_baud_rateMax Filippov2023-10-161-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | uart_get_baud_rate has input parameters 'min' and 'max' limiting the range of acceptable baud rates from the caller's perspective. If neither current or old termios structures have acceptable baud rate setting and 9600 is not in the min/max range either the function returns 0 and issues a warning. However for a UART that does not support speed of 9600 baud this is expected behavior. Clarify that 0 can be (and always could be) returned from the uart_get_baud_rate. Don't issue a warning in that case. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Link: https://lore.kernel.org/r/20231010085926.1021667-2-jcmvbkbc@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: xilinx_uartps: unset STOPBRK when setting STARTBRKJulien Malik2023-10-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Zynq UG585 states, in chapter B.33, for XUARTPS_CR_STARTBRK: It can only be set if STPBRK (Stop transmitter break) is not high This fixes tcsendbreak, which otherwise does not actually break. Signed-Off-By: Julien Malik <julien.malik@unseenlabs.fr> Link: https://lore.kernel.org/r/20230624210323.88455-1-julien.malik@unseenlabs.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | serial: max310x: remove trailing whitespacesHugo Villeneuve2023-10-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | Fix coding style. No functional changes. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20231011130317.3562401-1-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | Merge 6.6-rc6 into tty-nextGreg Kroah-Hartman2023-10-162-20/+20
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need the tty/serial fixes in here as well for testing, and this resolves merge conflicts in: drivers/tty/serial/serial_core.c as reported in linux-next Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | tty: serial: meson: Add a earlycon for the S4 SoCLucas Tanure2023-10-101-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The new Amlogic S4 SoC does not have a always-on uart, so add OF_EARLYCON_DECLARE for it. Amlogic T7 will use this as fallback. Signed-off-by: Lucas Tanure <tanure@linux.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20231009121151.4509-1-tanure@linux.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: initialize retinfo in uart_get_info()Alexey Dobriyan2023-10-071-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If this check ever triggers static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) { uport = uart_port_check(state); if (!uport) goto out; then all those sysfs users will print stack contents to userspace. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Link: https://lore.kernel.org/r/967b9ef1-fb36-48bf-9e6a-1b99af24c052@p183 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_bcm7271: Use devm_clk_get_optional_enabled()Andy Shevchenko2023-10-071-15/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use devm_clk_get_optional_enabled() to simplify the code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://lore.kernel.org/r/20231005124550.3607234-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: core: Simplify uart_get_rs485_mode()Andy Shevchenko2023-10-051-18/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Simplify uart_get_rs485_mode() by using temporary variable for the GPIO descriptor. With that, use proper type for the flags of the GPIO descriptor. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20231003142346.3072929-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_omap: Drop pm_runtime_irq_safe()Tony Lindgren2023-10-051-8/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Let's drop the use of pm_runtime_irq_safe() for 8250_omap. The use of pm_runtime_irq_safe() is not nice as it takes a permanent usage count on the parent device. We can finally drop pm_runtime_irq_safe() safely as the kernel now knows when the uart port tx is active. This changed with commit 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM"). For serial port rx, we already use Linux generic wakeirqs for 8250_omap. To drop pm_runtime_irq_safe(), we need to add handling for shallow idle state where the port hardware may already be awake and an IO interrupt happens. We also need to replace the serial8250_rpm sync calls in the interrupt handlers with async runtime PM calls. Note that omap8250_irq() calls omap_8250_dma_handle_irq(), so we don't need separate runtime PM calls in omap_8250_dma_handle_irq(). While at it, let's also add the missing line break to the end of omap8250_runtime_resume() to group the calls. Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20231004062650.64487-1-tony@atomide.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250: Check for valid console indexTony Lindgren2023-10-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Let's not allow negative numbers for console index. Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20231004085511.42645-1-tony@atomide.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: sc16is7xx: use device_property APIs when configuring irda modeHugo Villeneuve2023-10-031-10/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert driver to be property provider agnostic and allow it to be used on non-OF platforms. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20230927160153.2717788-2-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: amba-pl011: Do not complain when DMA is absentFabio Estevam2023-10-031-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Many SoCs do not integrate DMA for the amba pl011 UART, causing the following message on boot: uart-pl011 80074000.serial: no DMA platform data The UART still works in PIO, so better not to print such message that may confuse people by causing them to think that there is something wrong with the UART. Change the message to debug level. Signed-off-by: Fabio Estevam <festevam@denx.de> Link: https://lore.kernel.org/r/20230928145842.466933-1-festevam@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: imx: Put DMA enabled UART in separate lock subclassSascha Hauer2023-10-031-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lockdep complains about possible circular locking dependencies when the i.MX SDMA driver issues console messages under its spinlock. While the SDMA driver calls back into the UART when issuing a message, the i.MX UART driver will never call back into the SDMA driver for this UART, because DMA is explicitly not used for UARTs providing the console. To avoid the lockdep warnings put the UART port lock for console devices into a separate subclass. This fixes possible deadlock warnings like the following which was provoked by adding a printk to the i.MX SDMA driver at a place where the driver holds its spinlock. ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc3-00045-g517852be693b-dirty #110 Not tainted ------------------------------------------------------ swapper/0/0 is trying to acquire lock: c1818e04 (console_owner){-...}-{0:0}, at: console_flush_all+0x1c4/0x634 but task is already holding lock: c44649e0 (&vc->lock){-...}-{3:3}, at: sdma_int_handler+0xc4/0x368 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&vc->lock){-...}-{3:3}: _raw_spin_lock_irqsave+0x4c/0x68 sdma_prep_dma_cyclic+0x1a8/0x21c imx_uart_startup+0x44c/0x5d4 uart_startup+0x120/0x2b0 uart_port_activate+0x44/0x98 tty_port_open+0x80/0xd0 uart_open+0x18/0x20 tty_open+0x120/0x664 chrdev_open+0xc0/0x214 do_dentry_open+0x1d0/0x544 path_openat+0xbb0/0xea0 do_filp_open+0x5c/0xd4 do_sys_openat2+0xb8/0xf0 sys_openat+0x8c/0xd8 ret_fast_syscall+0x0/0x1c -> #1 (&port_lock_key){-.-.}-{3:3}: _raw_spin_lock_irqsave+0x4c/0x68 imx_uart_console_write+0x164/0x1a0 console_flush_all+0x220/0x634 console_unlock+0x64/0x164 vprintk_emit+0xb0/0x390 vprintk_default+0x24/0x2c _printk+0x2c/0x5c register_console+0x244/0x478 serial_core_register_port+0x5c4/0x618 imx_uart_probe+0x4e0/0x7d4 platform_probe+0x58/0xb0 really_probe+0xc4/0x2e0 __driver_probe_device+0x84/0x1a0 driver_probe_device+0x2c/0x108 __driver_attach+0x94/0x17c bus_for_each_dev+0x7c/0xd0 bus_add_driver+0xc4/0x1cc driver_register+0x7c/0x114 imx_uart_init+0x20/0x40 do_one_initcall+0x7c/0x3c4 kernel_init_freeable+0x17c/0x228 kernel_init+0x14/0x140 ret_from_fork+0x14/0x24 -> #0 (console_owner){-...}-{0:0}: __lock_acquire+0x14b0/0x29a0 lock_acquire.part.0+0xb4/0x264 console_flush_all+0x20c/0x634 console_unlock+0x64/0x164 vprintk_emit+0xb0/0x390 vprintk_default+0x24/0x2c _printk+0x2c/0x5c sdma_int_handler+0xcc/0x368 __handle_irq_event_percpu+0x94/0x2d0 handle_irq_event+0x38/0xd0 handle_fasteoi_irq+0x98/0x248 handle_irq_desc+0x1c/0x2c gic_handle_irq+0x6c/0x90 generic_handle_arch_irq+0x2c/0x64 __irq_svc+0x90/0xbc cpuidle_enter_state+0x1a0/0x4f4 cpuidle_enter+0x30/0x40 do_idle+0x210/0x2b4 cpu_startup_entry+0x28/0x2c rest_init+0xd0/0x184 arch_post_acpi_subsys_init+0x0/0x8 other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &vc->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&vc->lock); lock(&port_lock_key); lock(&vc->lock); lock(console_owner); *** DEADLOCK *** 3 locks held by swapper/0/0: #0: c44649e0 (&vc->lock){-...}-{3:3}, at: sdma_int_handler+0xc4/0x368 #1: c1818d50 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x24/0x2c #2: c1818d08 (console_srcu){....}-{0:0}, at: console_flush_all+0x44/0x634 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.0-rc3-00045-g517852be693b-dirty #110 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) unwind_backtrace from show_stack+0x10/0x14 show_stack from dump_stack_lvl+0x60/0x90 dump_stack_lvl from check_noncircular+0x184/0x1b8 check_noncircular from __lock_acquire+0x14b0/0x29a0 __lock_acquire from lock_acquire.part.0+0xb4/0x264 lock_acquire.part.0 from console_flush_all+0x20c/0x634 console_flush_all from console_unlock+0x64/0x164 console_unlock from vprintk_emit+0xb0/0x390 vprintk_emit from vprintk_default+0x24/0x2c vprintk_default from _printk+0x2c/0x5c _printk from sdma_int_handler+0xcc/0x368 sdma_int_handler from __handle_irq_event_percpu+0x94/0x2d0 __handle_irq_event_percpu from handle_irq_event+0x38/0xd0 handle_irq_event from handle_fasteoi_irq+0x98/0x248 handle_fasteoi_irq from handle_irq_desc+0x1c/0x2c handle_irq_desc from gic_handle_irq+0x6c/0x90 gic_handle_irq from generic_handle_arch_irq+0x2c/0x64 generic_handle_arch_irq from __irq_svc+0x90/0xbc Exception stack(0xc1801ee8 to 0xc1801f30) 1ee0: ffffffff ffffffff 00000001 00030349 00000000 00000012 1f00: 00000000 d7e45f4b 00000012 00000000 d7e16d63 c1810828 00000000 c1801f38 1f20: c108125c c1081260 60010013 ffffffff __irq_svc from cpuidle_enter_state+0x1a0/0x4f4 cpuidle_enter_state from cpuidle_enter+0x30/0x40 cpuidle_enter from do_idle+0x210/0x2b4 do_idle from cpu_startup_entry+0x28/0x2c cpu_startup_entry from rest_init+0xd0/0x184 rest_init from arch_post_acpi_subsys_init+0x0/0x8 Reported-by: Tim van der Staaij <Tim.vanderstaaij@zigngroup.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20230928064320.711603-1-s.hauer@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_pci1xxxx: Annotate struct pci1xxxx_8250 with __counted_byKees Cook2023-10-031-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct pci1xxxx_8250. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com> Cc: Tharun Kumar P <tharunkumar.pasumarthi@microchip.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jirislaby@kernel.org> Cc: linux-serial@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20230922175242.work.442-kees@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: exar: Add RS-485 support for Sealevel XR17V35X based cardsMatthew Howell2023-10-031-0/+44
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sealevel XR17V35X based cards utilize DTR to control RS-485 Enable, but the current implementation of 8250_exar uses RTS for the auto-RS485-Enable mode of the XR17V35X UARTs. This patch implements DTR Auto-RS485 on Sealevel cards. Signed-off-by: Matthew Howell <matthew.howell@sealevel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenkoa@linux.intel.com> Link: https://lore.kernel.org/r/4b8ad8ab6728742464c4e048fdeecb2b40522aef.camel@sealevel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: exar: Revert "serial: exar: Add support for Sealevel 7xxxC serial cards"Matthew Howell2023-10-031-14/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hardware ID of Sealevel 7xxxC cards changed prior to release. This has rendered 14ee78d5932a redundant. This reverts commit 14ee78d5932afeb710c8305196a676a715bfdea8. Signed-off-by: Matthew Howell <matthew.howell@sealevel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/8ffa2f583ff142c3b0eb6cf51a7c9cef5dbfd320.camel@sealevel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_dw: Use devm_clk_get_optional_enabled()Andy Shevchenko2023-10-031-24/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use devm_clk_get_optional_enabled() to simplify the code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20230919195513.3197930-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_of: Use devm_clk_get_enabled()Andy Shevchenko2023-10-031-16/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use devm_clk_get_enabled() to simplify the code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://lore.kernel.org/r/20230919195519.3197963-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_aspeed_vuart: Use devm_clk_get_enabled()Andy Shevchenko2023-10-031-12/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use devm_clk_get_enabled() to simplify the code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://lore.kernel.org/r/20230919195450.3197881-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: 8250_bcm7271: Use dev_err_probe() instead of dev_err()Andy Shevchenko2023-10-031-10/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make the error messages format unified by switching to use dev_err_probe() where it makes sense. This also helps simplifing the code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://lore.kernel.org/r/20230918103648.1185663-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | Merge 6.6-rc4 into tty-nextGreg Kroah-Hartman2023-10-021-1/+4
| |\ \ \ | | | |/ | | |/| | | | | | | | | | | | | | | | | We need the tty fixes in here as well for testing and to base changes on. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: xilinx_uartps: Use port lock wrappersThomas Gleixner2023-09-181-28/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-75-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: vt8500: Use port lock wrappersThomas Gleixner2023-09-181-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-74-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * | | serial: ucc_uart: Use port lock wrappersThomas Gleixner2023-09-181-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a serial port is used for kernel console output, then all modifications to the UART registers which are done from other contexts, e.g. getty, termios, are interference points for the kernel console. So far this has been ignored and the printk output is based on the principle of hope. The rework of the console infrastructure which aims to support threaded and atomic consoles, requires to mark sections which modify the UART registers as unsafe. This allows the atomic write function to make informed decisions and eventually to restore operational state. It also allows to prevent the regular UART code from modifying UART registers while printk output is in progress. All modifications of UART registers are guarded by the UART port lock, which provides an obvious synchronization point with the console infrastructure. To avoid adding this functionality to all UART drivers, wrap the spin_[un]lock*() invocations for uart_port::lock into helper functions which just contain the spin_[un]lock*() invocations for now. In a subsequent step these helpers will gain the console synchronization mechanisms. Converted with coccinelle. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Timur Tabi <timur@kernel.org> Signed-off-by: John Ogness <john.ogness@linutronix.de> Link: https://lore.kernel.org/r/20230914183831.587273-73-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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