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tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown()

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[ Upstream commit 4029dfc034 ]

The LPUART Status Register needs to be cleared when closing the uart
port to get a clean environment when reopening the uart.

Fixes: 380c966c09 ("tty: serial: fsl_lpuart: add 32-bit register interface support")
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20221125101953.18753-4-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sherry Sun
2022-11-25 18:19:53 +08:00
committed by Greg Kroah-Hartman
parent dc8ca4fb36
commit 64096d3b8d
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/fsl_lpuart.c
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@@ -1791,6 +1791,10 @@ static void lpuart32_shutdown(struct uart_port *port)
spin_lock_irqsave(&port->lock, flags);
/* clear status */
temp = lpuart32_read(&sport->port, UARTSTAT);
lpuart32_write(&sport->port, temp, UARTSTAT);
/* disable Rx/Tx DMA */
temp = lpuart32_read(port, UARTBAUD);
temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);