target/linux/leon/patches-5.15/0017-tty-serial-apbuart-Clear-error-and-break-bits-at-pro.patch

   1 From 72f84f6598168f11c9c5d17ccbd9a5ce66868cbb Mon Sep 17 00:00:00 2001
   2 From: Andreas Larsson <andreas@gaisler.com>
   3 Date: Tue, 22 Jun 2021 18:25:12 +0200
   4 Subject: [PATCH 17/32] tty/serial/apbuart: Clear error and break bits at probe
   5  time
   6
   7 Otherwise old bits laying around can trigger things like an old break
   8 bit triggering sysrq at first intput even though the break condition was
   9 ancient.
  10
  11 Signed-off-by: Andreas Larsson <andreas@gaisler.com>
  12 ---
  13  drivers/tty/serial/apbuart.c | 3 +++
  14  1 file changed, 3 insertions(+)
  15
  16 diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
  17 index a22c48e5d217..385d58c2cf04 100644
  18 --- a/drivers/tty/serial/apbuart.c
  19 +++ b/drivers/tty/serial/apbuart.c
  20 @@ -564,6 +564,9 @@ static int apbuart_probe(struct platform_device *op)
  21
  22         apbuart_flush_fifo((struct uart_port *) port);
  23
  24 +       /* Clear any errors or breaks */
  25 +       UART_PUT_STATUS(port, 0);
  26 +
  27         printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n",
  28                (unsigned long long) port->mapbase, port->irq);
  29         return 0;
  30 --
  31 2.34.1
  32