serial: omap: Fix EFR write on RTS deassertion

Commit 348f9bb ("serial: omap: Fix RTS handling") sought to enable
auto RTS upon manual RTS assertion and disable it on deassertion.
However it seems the latter was done incorrectly, it clears all bits in
the Extended Features Register *except* auto RTS.

Fixes: 348f9bb ("serial: omap: Fix RTS handling")
Cc: Peter Hurley <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Lukas Wunner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/tty/serial/omap-serial.c

@@ -693,7 +693,7 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
 		up->efr |= UART_EFR_RTS;
 	else
-		up->efr &= UART_EFR_RTS;
+		up->efr &= ~UART_EFR_RTS;
 	serial_out(up, UART_EFR, up->efr);
 	serial_out(up, UART_LCR, lcr);