Hi,
On 21. 11. 22, 21:27, Michael Walle wrote:
This will break serial output for the userspace on my board
(arch/arm/boot/dts/lan966x-kontron-kswitch-d10-mmt*dts). The uart_port_tx()
helper will call __port->ops->stop_tx(__port) if uart_circ_chars_pending()
returns 0. But the code above, doesn't do that. In fact, removing the
stop_tx() call in the helper macro, will fix the console output.
Any ideas how to fix that?
Hm, so ATMEL_US_TXRDY is removed from tx_done_mask in stop_tx, but not
added back in start_tx. So the tx interrupt is never handled (the tx
tasklet is not scheduled to send the queue chars) in
atmel_handle_transmit().
Any chance, the below fixes it?
diff --git a/drivers/tty/serial/atmel_serial.c
b/drivers/tty/serial/atmel_serial.c
index 11bf2466390e..395370e0c77b 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -596,6 +596,8 @@ static void atmel_start_tx(struct uart_port *port)
/* re-enable PDC transmit */
atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+ atmel_port->tx_done_mask |= ATMEL_US_TXRDY;
+
/* Enable interrupts */
atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask);
thanks,
--
js
