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- From 52039b6ffb6e78c2f77319b167dceab9aa51d13f Mon Sep 17 00:00:00 2001
- From: Phil Elwell <[email protected]>
- 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 <[email protected]>
- Signed-off-by: Phil Elwell <[email protected]>
- ---
- drivers/tty/serial/sc16is7xx.c | 3 +++
- 1 file changed, 3 insertions(+)
- --- a/drivers/tty/serial/sc16is7xx.c
- +++ b/drivers/tty/serial/sc16is7xx.c
- @@ -1222,6 +1222,9 @@ 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 */
- spin_lock_irqsave(&port->lock, flags);
- sc16is7xx_enable_ms(port);
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