target/linux/bcm27xx/patches-6.1/950-0791-serial-sc16is7xx-Read-modem-line-state-at-startup.patch

   1 From 52039b6ffb6e78c2f77319b167dceab9aa51d13f Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Tue, 13 Jun 2023 16:12:54 +0100
   4 Subject: [PATCH] serial: sc16is7xx: Read modem line state at startup
   5
   6 This patch sets the driver modem line state to the actual line state
   7 at driver startup.
   8
   9 See: https://github.com/raspberrypi/linux/issues/5501
  10
  11 Signed-off-by: Earl Schmidt <schmidt.earl.f@gmail.com>
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  13 ---
  14  drivers/tty/serial/sc16is7xx.c | 3 +++
  15  1 file changed, 3 insertions(+)
  16
  17 --- a/drivers/tty/serial/sc16is7xx.c
  18 +++ b/drivers/tty/serial/sc16is7xx.c
  19 @@ -1193,6 +1193,9 @@ static int sc16is7xx_startup(struct uart
  20               SC16IS7XX_IER_MSI_BIT;
  21         sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
  22
  23 +       /* Initialize the Modem Control signals to current status */
  24 +       one->old_mctrl = sc16is7xx_get_hwmctrl(port);
  25 +
  26         /* Enable modem status polling */
  27         uart_port_lock_irqsave(port, &flags);
  28         sc16is7xx_enable_ms(port);