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serial: bcm63xx-uart: fix tx after conversion to uart_port_tx_limited()

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commit ea55c65ded 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 7be50f2e8f ("serial: mxs-auart: fix tx").

Fixes: d11cc8c3c4 ("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>
This commit is contained in:
Jonas Gorski 2024-06-06 12:56:33 -07:00 committed by Greg Kroah-Hartman
parent 60dc1a2a3f
commit d3ebc5597e
1 changed files with 5 additions and 2 deletions
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7
drivers/tty/serial/bcm63xx_uart.c
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@ -309,8 +309,8 @@ static void bcm_uart_do_tx(struct uart_port *port)
val = bcm_uart_readl(port, UART_MCTL_REG); val = bcm_uart_readl(port, UART_MCTL_REG);
val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT; val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT;
pending = uart_port_tx_limited_flags(port, ch, UART_TX_NOSTOP,
pending = uart_port_tx_limited(port, ch, port->fifosize - val, port->fifosize - val,
true, true,
bcm_uart_writel(port, ch, UART_FIFO_REG), bcm_uart_writel(port, ch, UART_FIFO_REG),
({})); ({}));
@ -321,6 +321,9 @@ static void bcm_uart_do_tx(struct uart_port *port)
val = bcm_uart_readl(port, UART_IR_REG); val = bcm_uart_readl(port, UART_IR_REG);
val &= ~UART_TX_INT_MASK; val &= ~UART_TX_INT_MASK;
bcm_uart_writel(port, val, UART_IR_REG); bcm_uart_writel(port, val, UART_IR_REG);
if (uart_tx_stopped(port))
bcm_uart_stop_tx(port);
} }
/* /*