serial: mxs-auart: clean get_mctrl and set_mctrl

Russell King:
The only thing which the .get_mctrl method is supposed to do is
to return the state of the /input/ lines, which are CTS, DCD, DSR, RI.
The output line state is stored in port->mctrl, and is added to
the returned value by serial_core when it's required.
RTS output state should not be returned from the .get_mctrl method.

This patch removes ctrl variable from mxs_auart_port
and removes useless reading back RTS line.

The ctrl variable in mxs_auart_port duplicated mctrl,
member of uart_port structure in serial_core.h.
The removed code from mxs_auart_set_mctrl() and mxs_auart_get_mctrl
duplicated uart_update_mctrl() and uart_tiocmget()
in serial_core.c.

Signed-off-by: Janusz Uzycki <j.uzycki@elproma.com.pl>
Reviewed-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 0296c1c..907c3e5 100644 (file)
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -143,7 +143,6 @@ struct mxs_auart_port {
 #define MXS_AUART_DMA_RX_READY 3  /* bit 3 */
 #define MXS_AUART_RTSCTS       4  /* bit 4 */
        unsigned long flags;
-       unsigned int ctrl;
        enum mxs_auart_type devtype;
 
        unsigned int irq;
@@ -406,8 +405,6 @@ static void mxs_auart_release_port(struct uart_port *u)
 
 static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl)
 {
-       struct mxs_auart_port *s = to_auart_port(u);
-
        u32 ctrl = readl(u->membase + AUART_CTRL2);
 
        ctrl &= ~(AUART_CTRL2_RTSEN | AUART_CTRL2_RTS);
@@ -418,24 +415,17 @@ static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl)
                        ctrl |= AUART_CTRL2_RTS;
        }
 
-       s->ctrl = mctrl;
        writel(ctrl, u->membase + AUART_CTRL2);
 }
 
 static u32 mxs_auart_get_mctrl(struct uart_port *u)
 {
-       struct mxs_auart_port *s = to_auart_port(u);
        u32 stat = readl(u->membase + AUART_STAT);
-       int ctrl2 = readl(u->membase + AUART_CTRL2);
-       u32 mctrl = s->ctrl;
+       u32 mctrl = 0;
 
-       mctrl &= ~TIOCM_CTS;
        if (stat & AUART_STAT_CTS)
                mctrl |= TIOCM_CTS;
 
-       if (ctrl2 & AUART_CTRL2_RTS)
-               mctrl |= TIOCM_RTS;
-
        return mctrl;
 }
 
@@ -1071,8 +1061,6 @@ static int mxs_auart_probe(struct platform_device *pdev)
        s->port.type = PORT_IMX;
        s->port.dev = s->dev = &pdev->dev;
 
-       s->ctrl = 0;
-
        s->irq = platform_get_irq(pdev, 0);
        s->port.irq = s->irq;
        ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s);