29 lines
990 B
Diff
29 lines
990 B
Diff
From 52039b6ffb6e78c2f77319b167dceab9aa51d13f Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Tue, 13 Jun 2023 16:12:54 +0100
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Subject: [PATCH] serial: sc16is7xx: Read modem line state at startup
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This patch sets the driver modem line state to the actual line state
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at driver startup.
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See: https://github.com/raspberrypi/linux/issues/5501
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Signed-off-by: Earl Schmidt <schmidt.earl.f@gmail.com>
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/tty/serial/sc16is7xx.c | 3 +++
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1 file changed, 3 insertions(+)
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--- a/drivers/tty/serial/sc16is7xx.c
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+++ b/drivers/tty/serial/sc16is7xx.c
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@@ -1222,6 +1222,9 @@ static int sc16is7xx_startup(struct uart
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SC16IS7XX_IER_MSI_BIT;
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sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
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+ /* Initialize the Modem Control signals to current status */
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+ one->old_mctrl = sc16is7xx_get_hwmctrl(port);
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+
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/* Enable modem status polling */
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spin_lock_irqsave(&port->lock, flags);
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sc16is7xx_enable_ms(port);
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