Serial8250_tx_empty
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. 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 ...
Serial8250_tx_empty
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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 … 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_chars(up); spin_unlock_irqrestore(&port->lock, flags);} iir = serial_port_in(port, UART_IIR); return serial8250_handle_irq(port, iir);} static unsigned int … 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 ...
WebI 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 ...
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 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. great lakes athletic training associationWeb17 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 … floating shelves sneakersWebFirst 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. great lakes athletic trainers associationWebstatic 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) + +/* great lakes attc networkWebserial8250_early_out (port, UART_TX, c); for (;;) { status = serial8250_early_in (port, UART_LSR); if ( uart_lsr_tx_empty (status)) break; cpu_relax (); } } static void … great lakes athletic club pricesWebThe transmitter should not be turned off before all characters have been transmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they … great lakes atlasWebstart_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" great lakes attc