From 52039b6ffb6e78c2f77319b167dceab9aa51d13f Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 13 Jun 2023 16:12:54 +0100 Subject: [PATCH] serial: sc16is7xx: Read modem line state at startup This patch sets the driver modem line state to the actual line state at driver startup. See: https://github.com/raspberrypi/linux/issues/5501 Signed-off-by: Earl Schmidt Signed-off-by: Phil Elwell --- drivers/tty/serial/sc16is7xx.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1193,6 +1193,9 @@ static int sc16is7xx_startup(struct uart SC16IS7XX_IER_MSI_BIT; sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val); + /* Initialize the Modem Control signals to current status */ + one->old_mctrl = sc16is7xx_get_hwmctrl(port); + /* Enable modem status polling */ uart_port_lock_irqsave(port, &flags); sc16is7xx_enable_ms(port);