Serial8250_tx_empty

Author: pxog

August undefined, 2024

Webtransmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they actually were. === Discovered in parallel with more testing and analysis by Kees … Webtransmitted. serial8250_tx_empty() was reporting that all characters were: transmitted before they actually were. === Discovered in parallel with more testing and analysis by …

LKML: Eric Tremblay: [PATCH 1/3] serial: 8250: Handle UART …

Webserial8250_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 … 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. * unethical ads in the philippines

[J6] serial8250: too much work for irq301 - Processors forum ...

Webstart_tx() can be deferred in the rs485 case, but that doesn't mean you should suspend the device here. In fact, that look like it would just break runtime PM (the parts that may work to some extent). >if (em485) >start_tx_rs485(port); Johan Next message: Luca Weiss: "Re: [PATCH 2/3] Input - aw8695: Add driver for AW8695 haptics" 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 … 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 … thread affinity linux

[PATCH 04/18] tty: serial: 8250_core: add run time pm - Sebastian ...

Linux-Kernel Archive: [PATCH 5.4 235/475] serial: 8250: Fix race ...

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 … 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 … unethical activities in businessWebThis is because when IRQ handler is called due to TX FIFO empty event, RX FIFO is serviced based on UART_LSR register status instead of UART_IIR status. This defeats the purpose of disabling UART RX FIFO interrupts during throttling(see, omap_8250_throttle()) as IRQ handler continues to drain UART RX FIFO resulting in overflow of buffer at tty layer. thread aeroporto interior mg

"Webtransmitted. serial8250_tx_empty() was reporting that all characters were: transmitted before they actually were. === Discovered in parallel with more testing and analysis by Kees Schoenmakers: as follows: I ran into an NetMos 9835 serial pci board which behaves a little: different than the standard. This type of expansion board is very common. " - Serial8250_tx_empty

Serial8250_tx_empty

c - Interrupts in UART 16550 and Linux Kernel - Stack …

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 ... Webstatic unsigned int serial8250_tx_empty (struct uart_port *port) @@ -1523,6 +1583,36 @@ static void serial8250_break_ctl (struct up->lcr &= ~UART_LCR_SBC; serial_out (up, UART_LCR, up->lcr); spin_unlock_irqrestore (&up->port.lock, flags); +} + +#define BOTH_EMPTY (UART_LSR_TEMT UART_LSR_THRE) + +/*

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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 ... WebInstead we leave serial8250_tx_chars() with RPM enabled and wait for the FIFO empty interrupt. Once we enter serial8250_tx_chars() with an empty buffer we know that the FIFO is empty and since we are not going to send anything, we can disable the device. That xchg() is to ensure that serial8250_tx_chars() can be called multiple times and only ...

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 ... Webserial8250_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 …

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 … 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 …

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 *

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 … unethical activities in financeWebThe transmitter should not be turned off before all characters have been transmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they … thread aestheticWeb21 Feb 2010 · serial8250_tx_empty() was reporting that all characters were transmitted before they actually were. === Discovered in parallel with more testing and analysis by … unethical accounting practicesWebAs 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 serial8250_tx_empty() whether there's > > DMA Tx active. > > > > Note: This fix only addresses in-kernel race mainly to make using > > TCSADRAIN/FLUSH robust. Userspace … thread affinity msdnWebAs 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 … thread airpod pro caseWebensure we do not disable the TX-FIFO-empty interrupt even if there is nothing to send. Instead we enter serial8250_tx_chars() once again with empty FIFO and empty tty-buffer … unethical adsWebRight 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 thread airtonomy