serial: fsl_lpuart: remove RTSCTS handling from get_mctrl()

[ Upstream commit e60c2991f18bf221fa9908ff10cb24eaedaa9bae ]

The wrong code in set_mctrl() was already removed in commit 2b30efe2e88a
("tty: serial: lpuart: Remove unnecessary code from set_mctrl"), but the
code in get_mctrl() wasn't removed. It will not return the state of the
RTS or CTS line but whether automatic flow control is enabled, which is
wrong for the get_mctrl(). Thus remove it.

Fixes: 2b30efe2e88a ("tty: serial: lpuart: Remove unnecessary code from set_mctrl")
Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210512141255.18277-7-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 6b8e638..de5ee4a 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1408,17 +1408,7 @@ static unsigned int lpuart_get_mctrl(struct uart_port *port)
 
 static unsigned int lpuart32_get_mctrl(struct uart_port *port)
 {
-       unsigned int temp = 0;
-       unsigned long reg;
-
-       reg = lpuart32_read(port, UARTMODIR);
-       if (reg & UARTMODIR_TXCTSE)
-               temp |= TIOCM_CTS;
-
-       if (reg & UARTMODIR_RXRTSE)
-               temp |= TIOCM_RTS;
-
-       return temp;
+       return 0;
 }
 
 static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)