Serial8250_tx_empty

Author: kpgr

August undefined, 2024

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 … 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 …

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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" 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 … halfords autocentre scotswood road

[PATCH 3/5] tty: serial: 8250 core: allow to set ->throttle ...

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. Web20 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 … Web[prev in list] [next in list] [prev in thread] [next in thread] List: linux-serial Subject: [PATCH] serial8250_tx_empty not telling the truth From: Dick Hollenbeck Date: 2009-09-26 20:21:43 Message-ID: 4ABE77D7.3090609 softplc ! com [Download RAW message or body] When controlling an industrial radio modem it can be necessary to … halfords autocentre seafield

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

8250_dw DMA issue with BYT

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 ... 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. halfords autocentre sheffield hillsboroughWeb1 day ago · From:: Greg Kroah-Hartman To:: linux-kernel-AT-vger.kernel.org, akpm-AT-linux-foundation.org, torvalds-AT-linux-foundation.org, stable ... halfords autocentre shirley retail park

"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. " - Serial8250_tx_empty

Serial8250_tx_empty

Linux-Kernel Archive: [PATCH] 8250 UART backup timer - IU

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 … 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 …

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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 …

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 … 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 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 …

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 ... 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 …

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 …

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 … halfords autocentre service and motWeb12 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 ... bundy bearWebtransmitted. serial8250_tx_empty() was reporting that all characters were: transmitted before they actually were. === Discovered in parallel with more testing and analysis by … halfords autocentre sheffield crystal peaks