openwrt/target/linux/bcm27xx/patches-6.6/950-0475-serial-sc16is7xx-Read-modem-line-state-at-startup.patch
Álvaro Fernández Rojas 8c405cdccc bcm27xx: add 6.6 kernel patches
The patches were generated from the RPi repo with the following command:
git format-patch v6.6.34..rpi-6.1.y

Some patches needed rebasing and, as usual, the applied and reverted, wireless
drivers, Github workflows, READMEs and defconfigs patches were removed.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2024-06-18 18:52:49 +02:00

29 lines
999 B
Diff

From 3a49598d7be0e3085f3229723e278fe3a6992f59 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Tue, 13 Jun 2023 16:12:54 +0100
Subject: [PATCH 0475/1085] 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
@@ -1206,6 +1206,9 @@ 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);