serial: pl011: Adopt generic flag to store auto RTS status

Back in 2010, commit 3b43816f685f ("ARM: 5933/1: amba-pl011: support
hardware flow control") added an autorts flag to this driver to store
whether automatic hardware flow control is requested.

In 2015, commit 391f93f2ec9f ("serial: core: Rework hw-assisted flow
control support") added a flag with identical functionality to generic
code.

Switch over to that flag and drop the driver-specific one.

Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/amba-pl011.c

@@ -281,7 +281,6 @@ struct uart_amba_port {
 	unsigned int		old_status;
 	unsigned int		fifosize;	/* vendor-specific */
 	unsigned int		old_cr;		/* state during shutdown */
-	bool			autorts;
 	unsigned int		fixed_baud;	/* vendor-set fixed baud rate */
 	char			type[12];
 #ifdef CONFIG_DMA_ENGINE
@@ -1586,7 +1585,7 @@ static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	TIOCMBIT(TIOCM_OUT2, UART011_CR_OUT2);
 	TIOCMBIT(TIOCM_LOOP, UART011_CR_LBE);
 
-	if (uap->autorts) {
+	if (port->status & UPSTAT_AUTORTS) {
 		/* We need to disable auto-RTS if we want to turn RTS off */
 		TIOCMBIT(TIOCM_RTS, UART011_CR_RTSEN);
 	}
@@ -1840,7 +1839,7 @@ static void pl011_disable_uart(struct uart_amba_port *uap)
 {
 	unsigned int cr;
 
-	uap->autorts = false;
+	uap->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);
 	spin_lock_irq(&uap->port.lock);
 	cr = pl011_read(uap, REG_CR);
 	uap->old_cr = cr;
@@ -2026,10 +2025,10 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
 			old_cr |= UART011_CR_RTSEN;
 
 		old_cr |= UART011_CR_CTSEN;
-		uap->autorts = true;
+		port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
 	} else {
 		old_cr &= ~(UART011_CR_CTSEN | UART011_CR_RTSEN);
-		uap->autorts = false;
+		port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);
 	}
 
 	if (uap->vendor->oversampling) {