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From 52039b6ffb6e78c2f77319b167dceab9aa51d13f Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
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 <schmidt.earl.f@gmail.com>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
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);
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