From: Sherry Sun Date: Fri, 25 Nov 2022 10:19:53 +0000 (+0800) Subject: tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown() X-Git-Tag: v6.1.16~459 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=64096d3b8d1158c4409d06cb36fd8d42dd69e1bb;p=users%2Fdwmw2%2Flinux.git tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown() [ Upstream commit 4029dfc034febb54f6dd8ea83568accc943bc088 ] The LPUART Status Register needs to be cleared when closing the uart port to get a clean environment when reopening the uart. Fixes: 380c966c093e ("tty: serial: fsl_lpuart: add 32-bit register interface support") Signed-off-by: Sherry Sun Link: https://lore.kernel.org/r/20221125101953.18753-4-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 262b059e3ee11..110c8720af47a 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -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);