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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
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>
This commit is contained in:
Phil Elwell
2023-06-13 16:12:54 +01:00
committed by Dom Cobley
parent 797299e16f
commit cfff4f7944
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/sc16is7xx.c
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@@ -1205,6 +1205,9 @@ static int sc16is7xx_startup(struct uart_port *port)
SC16IS7XX_IER_MSI_BIT; SC16IS7XX_IER_MSI_BIT;
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val); 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 */ /* Enable modem status polling */
uart_port_lock_irqsave(port, &flags); uart_port_lock_irqsave(port, &flags);
sc16is7xx_enable_ms(port); sc16is7xx_enable_ms(port);