6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jonas Gorski jonas.gorski@gmail.com
commit ea55c65dedf40e9c1911dc1e63e26bc9a59692b9 upstream.
When bcm63xx-uart was converted to uart_port_tx_limited(), it implicitly added a call to stop_tx(). This causes garbage to be put out on the serial console. To fix this, pass UART_TX_NOSTOP in flags, and manually call stop_tx() ourselves analogue to how a similar issue was fixed in commit 7be50f2e8f20 ("serial: mxs-auart: fix tx").
Fixes: d11cc8c3c4b6 ("tty: serial: use uart_port_tx_limited()") Cc: stable@vger.kernel.org Signed-off-by: Jonas Gorski jonas.gorski@gmail.com Signed-off-by: Doug Brown doug@schmorgal.com Link: https://lore.kernel.org/r/20240606195632.173255-4-doug@schmorgal.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/bcm63xx_uart.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/bcm63xx_uart.c +++ b/drivers/tty/serial/bcm63xx_uart.c @@ -309,8 +309,8 @@ static void bcm_uart_do_tx(struct uart_p
val = bcm_uart_readl(port, UART_MCTL_REG); val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT; - - pending = uart_port_tx_limited(port, ch, port->fifosize - val, + pending = uart_port_tx_limited_flags(port, ch, UART_TX_NOSTOP, + port->fifosize - val, true, bcm_uart_writel(port, ch, UART_FIFO_REG), ({})); @@ -321,6 +321,9 @@ static void bcm_uart_do_tx(struct uart_p val = bcm_uart_readl(port, UART_IR_REG); val &= ~UART_TX_INT_MASK; bcm_uart_writel(port, val, UART_IR_REG); + + if (uart_tx_stopped(port)) + bcm_uart_stop_tx(port); }
/*