Serial8250_tx_empty

Author: ttpn

August undefined, 2024

Weblinux/drivers/tty/serial/8250/8250_core.c Go to file Cannot retrieve contributors at this time 1300 lines (1080 sloc) 33 KB Raw Blame // SPDX-License-Identifier: GPL-2.0+ /* * Universal/legacy driver for 8250/16550-type serial ports * * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. * * Copyright (C) 2001 Russell King. * Weblinux/drivers/tty/serial/8250/8250_port.c Go to file ij-intel serial: 8250: Prevent starting up DMA Rx on THRI interrupt Latest commit 90b8596 last month History 73 contributors +38 3536 lines (3040 sloc) 90.8 KB Raw Blame // SPDX-License-Identifier: GPL-2.0+ /* * Base port operations for 8250/16550-type serial ports *

Boot hangs on serial8250: too much work for irq36

Web[ 818.218834] serial8250_interrupt: 2638 callbacks suppressed [ 818.224432] serial8250: too much work for irq301 [ 818.230884] serial8250: too much work for irq301 [ 818.237320] serial8250: too much work for irq301 [ 818.243763] serial8250: too much work for irq301 [ 818.250199] serial8250: too much work for irq301 [ 818.256642] serial8250: too much … Web12 Nov 2024 · I am experiencing a "serial8250: too much work for irq36" problem around 50-75% times I try to boot. What I was thinking to do is Stack Overflow. About; Products For Teams; Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent ... physics at work book 2 pdf

RE: [PATCH 2/2] serial: 8250: Fix serial8250_tx_empty() race with …

WebRight now it is possible that serial8250_tx_dma() fails and returns -EBUSY. The caller (serial8250_start_tx()) will then enable UART_IER_THRI which will generate an interrupt once the TX FIFO is empty. In serial8250_handle_irq() nothing will happen because up->dma is set and so serial8250_tx_chars() won't be invoked. We end up with plenty of WebYou may want to take a look at the existing driver in drivers/tty/serial/8250.c (it handles the 16550 devices and other similar devices as well). The interrupt handler is … Web17 Mar 2024 · As Tx side is definitely > not empty at that point, it seems incorrect for serial8250_tx_empty() > claim Tx is empty. > > Fix the race by also checking in … tooling cloud

Subject RE: [PATCH v2 2/2] serial: 8250: Fix serial8250_tx_empty() …

linux/8250_dma.c at master · torvalds/linux · GitHub

Web1 day ago · From:: Greg Kroah-Hartman To:: linux-kernel-AT-vger.kernel.org, akpm-AT-linux-foundation.org, torvalds-AT-linux-foundation.org, stable ... Webserial8250_tx_empty() was reporting that all characters were transmitted before they actually were. === Discovered in parallel with more testing and analysis by Kees … physics at work book 2 second edition answerWebserial8250_tx_empty identifier - Linux source code (v6.0.7) - Bootlin Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low … physics at work login

"Webserial8250_tx_chars(up); spin_unlock_irqrestore(&port->lock, flags);} iir = serial_port_in(port, UART_IIR); return serial8250_handle_irq(port, iir);} static unsigned int … " - Serial8250_tx_empty

Serial8250_tx_empty

linux/8250_port.c at master · torvalds/linux · GitHub

Web22 Aug 2024 · You could also have serial8250: too much work for irq4 on a phsyical system with broken UART. I am debugging an ARM chipset via UART and have already broken two … Web28 Jan 2024 · The patch introduce the UART_CAP_TEMT capability which is by default assigned to all 8250 UART since the code assume that device has the interrupt on TEMT …

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Webthe OMAP_UART_SCR_TX_EMPTY part. The driver has always TX_EMPTY set because the 8250 core expects an interrupt after the TX fifo + shift register is empty. The rs485 parts … Webvoid serial8250_rpm_put_tx(struct uart_8250_port *p); 205: 206: int serial8250_em485_config(struct uart_port *port, struct ktermios *termios, 207: struct serial_rs485 *rs485); 208: void serial8250_em485_start_tx(struct uart_8250_port *p); 209: void serial8250_em485_stop_tx(struct uart_8250_port *p); 210: void …

Web*PATCH v3 0/6] LSR flag preservation improvements @ 2024-06-07 8:29 Ilpo Järvinen 2024-06-07 8:29 ` [PATCH v3 1/6] serial: 8250: Store to lsr_save_flags after lsr read Ilpo Järvinen ` (6 more replies) 0 siblings, 7 replies; 11+ messages in thread From: Ilpo Järvinen @ 2024-06-07 8:29 UTC (permalink / raw) To: linux-serial, Greg KH, Jiri Slaby, Andy Shevchenko, Uwe … WebRight now it is possible that serial8250_tx_dma () fails and returns -EBUSY. The caller (serial8250_start_tx ()) will then enable UART_IER_THRI which will generate an interrupt …

WebI contact you regarding the 8250_dw driver. My setup is an Asus T100TA (baytrail) + kernel 3.14. The UART controller is ACPI enumerated (ID is 80860F0A). (UART_CAP_AFE capable) This uart is used to communicate with a BCM4324 bluetooth chip (HCI H4 over uart). However we have many bluetooth instabilities. Web7 Apr 2016 · Well, omap8250 has totally different (and possibly unnecessary) rx dma flow. During the development of the omap8250 driver, it was discovered that the normal 8250 rx dma flow didn't work reliably on OMAP; ie., the rx dma wouldn't start once rx uart interrupt had already happened. *So omap8250 sets up rx dma before any data has been received ...

WebFirst one is caused by a recursive mutex lock which. * happens when clk_set_rate () is called from dw8250_set_termios (). * Second deadlock is more tricky and is caused by an inverted order of. * the clk and tty-port mutexes lock. It happens if clock rate change.

physics atwood machine lab answersWebtransmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they actually were. === Discovered in parallel with more testing and analysis by Kees … physics at work book 3a answerWebI noticed that the serial8250_tx_dma() is invoked sometimes while uart_circ_empty() says that the buffer is empty. I tracked one occuring down to: n_tty_write() ... ->start_tx() if the buffer is empty. The serial core can't assume that start_tx() does not need invoking because hardware that can stop_tx() with data in the transmitter ... physics at work book 2Webserial8250_do_prepare_tx_dma (p); desc = dmaengine_prep_slave_single (dma-> txchan, dma-> tx_addr + xmit-> tail, dma-> tx_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT DMA_CTRL_ACK); if (!desc) { ret = -EBUSY; goto err; } dma-> tx_running = 1; desc-> callback = __dma_tx_complete; desc-> callback_param = p; dma-> tx_cookie = dmaengine_submit … physics atwood machine calculatorWebtransmitted. serial8250_tx_empty() was reporting that all characters were: transmitted before they actually were. === Discovered in parallel with more testing and analysis by … physics aubWebserial8250_stop_rx(&up->port); + * While serial8250_em485_handle_stop_tx() is a noop if + * em485->active_timer != &em485->stop_tx_timer, it might happen that + * the timer is still armed and triggers only after the current bunch of + * chars is send and em485->active_timer == &em485->stop_tx_timer again. + * So cancel the timer. physics at work答案WebThe transmitter should not be turned off before all characters have been transmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they … physics augusto montenegro qmagico