Serial8250_tx_empty

Author: apiw

August undefined, 2024

Web21 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 … 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 …

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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 … 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 … ending a 40 year friendship

[22/45] serial: 8250: add serial transmitter fully empty test

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

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

Web1 day ago · Lingyu Liu (1): ice: Reset FDIR counter in FDIR init stage Lorenzo Bianconi (1): wifi: mt76: mt7921: fix fw used for offload check for mt7922 Lukas Wunner (6): cxl/pci: Fix CDAT retrieval on big endian cxl/pci: Handle truncated CDAT header cxl/pci: Handle truncated CDAT entries cxl/pci: Handle excessive CDAT length PCI/DOE: Silence WARN … WebAs 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 … ending a 20 year marriageWeblinux/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 * ending 4 cry of fear

"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" " - Serial8250_tx_empty

Serial8250_tx_empty

8250.h source code [linux/drivers/tty/serial/8250/8250.h ... - Woboq

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. * 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 ...

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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 ... 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 …

Webserial8250_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. 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 …

Webensure 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 … 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 …

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 ending a blasphemousWebtransmitted. 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. ending a business email in frenchWeb*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 … dr. cary belen tucsonWeblinux/8250_omap.c at master · torvalds/linux · GitHub torvalds / linux Public master linux/drivers/tty/serial/8250/8250_omap.c Go to file Cannot retrieve contributors at this time 1793 lines (1501 sloc) 47 KB Raw Blame // SPDX-License-Identifier: GPL-2.0 /* * 8250-core based driver for the OMAP internal UART * ending a 50 year friendshipWeb20 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 … ending a 6 month tenancyWebserial8250_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 … ending a bare trustWebRight 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 … dr. cary bly periodontist maryland