kernel.git/drivers/tty, branch linux-6.12.y

serial: 8250: 8250_omap.c: Clear DMA RX running status only after DMA termination is done

2026-03-04T12:21:25Z

[ Upstream commit a5fd8945a478ff9be14812693891d7c9b4185a50 ] Clear rx_running flag only after DMA teardown polling completes. In the previous implementation the flag was being cleared while hardware teardown was still in progress, creating a mismatch between software state (flag = 0, "ready") and hardware state (still terminating). Signed-off-by: Moteen Shah Link: https://patch.msgid.link/20260112081829.63049-3-m-shah@ti.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

serial: 8250: 8250_omap.c: Add support for handling UART error conditions

2026-03-04T12:21:25Z

[ Upstream commit 623b07b370e9963122d167e04fdc1dc713ebfbaf ] The DMA IRQ handler does not accounts for the overrun(OE) or any other errors being reported by the IP before triggering a DMA transaction which leads to the interrupts not being handled resulting into an IRQ storm. The way to handle OE is to: 1. Reset the RX FIFO. 2. Read the UART_RESUME register, which clears the internal flag Earlier, the driver issued DMA transations even in case of OE which shouldn't be done according to the OE handling mechanism mentioned above, as we are resetting the FIFO's, refer section: "12.1.6.4.8.1.3.6 Overrun During Receive" [0]. [0] https://www.ti.com/lit/pdf/spruiu1 Signed-off-by: Moteen Shah Link: https://patch.msgid.link/20260112081829.63049-2-m-shah@ti.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

serial: 8250_dw: handle clock enable errors in runtime_resume

2026-03-04T12:21:23Z

[ Upstream commit d31228143a489ba6ba797896a07541ce06828c09 ] Add error checking for clk_prepare_enable() calls in dw8250_runtime_resume(). Currently if either clock fails to enable, the function returns success while leaving clocks in inconsistent state. This change implements comprehensive error handling by checking the return values of both clk_prepare_enable() calls. If the second clock enable operation fails after the first clock has already been successfully enabled, the code now properly cleans up by disabling and unpreparing the first clock before returning. The error code is then propagated to the caller, ensuring that clock enable failures are properly reported rather than being silently ignored. Signed-off-by: Artem Shimko Link: https://patch.msgid.link/20251104145433.2316165-2-a.shimko.dev@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

serial: SH_SCI: improve "DMA support" prompt

2026-03-04T12:20:29Z

[ Upstream commit 93bb95a11238d66a4c9aa6eabf9774b073a5895c ] Having a prompt of "DMA support" suddenly appear during a "make oldconfig" can be confusing. Add a little helpful text to the prompt message. Fixes: 73a19e4c0301 ("serial: sh-sci: Add DMA support.") Signed-off-by: Randy Dunlap Reviewed-by: Geert Uytterhoeven Link: https://patch.msgid.link/20260110232643.3533351-5-rdunlap@infradead.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

serial: imx: change SERIAL_IMX_CONSOLE to bool

2026-03-04T12:20:29Z

[ Upstream commit 79527d86ba91c2d9354832d19fd12b3baa66bd10 ] SERIAL_IMX_CONSOLE is a build option for the imx driver (SERIAL_IMX). It does not build a separate console driver file, so it can't be built as a module since it isn't built at all. Change the Kconfig symbol from tristate to bool and update the help text accordingly. Fixes: 0db4f9b91c86 ("tty: serial: imx: enable imx serial console port as module") Signed-off-by: Randy Dunlap Link: https://patch.msgid.link/20260110232643.3533351-2-rdunlap@infradead.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

serial: 8250_pci: Fix broken RS485 for F81504/508/512

2026-01-30T09:28:40Z

commit 27aff0a56b3c77ea1a73641c9b3c4172a8f7238f upstream. Fintek F81504/508/512 can support both RTS_ON_SEND and RTS_AFTER_SEND, but pci_fintek_rs485_supported only announces the former. This makes it impossible to unset SER_RS485_RTS_ON_SEND from userspace because of uart_sanitize_serial_rs485(). Some devices with these chips need RTS low on TX, so they are effectively broken. Fix this by announcing the support for SER_RS485_RTS_AFTER_SEND, similar to commit 068d35a7be65 ("serial: sc16is7xx: announce support for SER_RS485_RTS_ON_SEND"). Fixes: 4afeced55baa ("serial: core: fix sanitizing check for RTS settings") Cc: stable Signed-off-by: Marnix Rijnart Link: https://patch.msgid.link/20260112000931.61703-1-marnix.rijnart@iwell.eu Signed-off-by: Greg Kroah-Hartman

tty: fix tty_port_tty_*hangup() kernel-doc

2026-01-08T09:15:01Z

commit 6241b49540a65a6d5274fa938fd3eb4cbfe2e076 upstream. The commit below added a new helper, but omitted to move (and add) the corressponding kernel-doc. Do it now. Signed-off-by: "Jiri Slaby (SUSE)" Fixes: 2b5eac0f8c6e ("tty: introduce and use tty_port_tty_vhangup() helper") Link: https://lore.kernel.org/all/b23d566c-09dc-7374-cc87-0ad4660e8b2e@linux.intel.com/ Reported-by: Ilpo Järvinen Cc: Jonathan Corbet Cc: linux-doc@vger.kernel.org Link: https://lore.kernel.org/r/20250624080641.509959-6-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman

serial: core: Fix serial device initialization

2026-01-08T09:15:01Z

commit f54151148b969fb4b62bec8093d255306d20df30 upstream. During restoring sysfs fwnode information the information of_node_reused was dropped. This was previously set by device_set_of_node_from_dev(). Add it back manually Fixes: 24ec03cc5512 ("serial: core: Restore sysfs fwnode information") Cc: stable Suggested-by: Cosmin Tanislav Signed-off-by: Alexander Stein Tested-by: Michael Walle Tested-by: Marek Szyprowski Tested-by: Cosmin Tanislav Link: https://patch.msgid.link/20251219152813.1893982-1-alexander.stein@ew.tq-group.com Signed-off-by: Greg Kroah-Hartman

serial: xilinx_uartps: fix rs485 delay_rts_after_send

2026-01-08T09:14:59Z

[ Upstream commit 267ee93c417e685d9f8e079e41c70ba6ee4df5a5 ] RTS line control with delay should be triggered when there is no more bytes in kfifo and hardware buffer is empty. Without this patch RTS control is scheduled right after feeding hardware buffer and this is too early. RTS line may change state before hardware buffer is empty. With this patch delayed RTS state change is triggered when function cdns_uart_handle_tx is called from cdns_uart_isr on CDNS_UART_IXR_TXEMPTY exactly when hardware completed transmission Fixes: fccc9d9233f9 ("tty: serial: uartps: Add rs485 support to uartps driver") Cc: stable Link: https://patch.msgid.link/20251221103221.1971125-1-jakub.turek@elsta.tech Signed-off-by: Jakub Turek Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

serial: xilinx_uartps: Use helper function hrtimer_update_function()

2026-01-08T09:14:59Z

[ Upstream commit eee00df8e1f1f5648ed8f9e40e2bb54c2877344a ] The field 'function' of struct hrtimer should not be changed directly, as the write is lockless and a concurrent timer expiry might end up using the wrong function pointer. Switch to use hrtimer_update_function() which also performs runtime checks that it is safe to modify the callback. Signed-off-by: Nam Cao Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/af7823518fb060c6c97105a2513cfc61adbdf38f.1738746927.git.namcao@linutronix.de Stable-dep-of: 267ee93c417e ("serial: xilinx_uartps: fix rs485 delay_rts_after_send") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman