serial: sh-sci: Clear (H)SCIF timeout and overrun during reset

Add the missing timeout bit definition for (H)SCIF.
Clear the timeout and overrun flag bits during UART reset, cfr. the
initialization flowchart in the datasheet.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 408f706..432d9ac 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2156,6 +2156,11 @@ static void sci_reset(struct uart_port *port)
        sci_clear_SCxSR(port,
                        SCxSR_RDxF_CLEAR(port) & SCxSR_ERROR_CLEAR(port) &
                        SCxSR_BREAK_CLEAR(port));
+       if (sci_getreg(port, SCLSR)->size) {
+               status = serial_port_in(port, SCLSR);
+               status &= ~(SCLSR_TO | SCLSR_ORER);
+               serial_port_out(port, SCLSR, status);
+       }
 }
 
 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,

diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h
index e7d2bc6..ffa6d68 100644 (file)
--- a/drivers/tty/serial/sh-sci.h
+++ b/drivers/tty/serial/sh-sci.h
@@ -105,6 +105,7 @@ enum {
 #define SCFCR_LOOP     BIT(0)  /* Loopback Test */
 
 /* SCLSR (Line Status Register) on (H)SCIF */
+#define SCLSR_TO       BIT(2)  /* Timeout */
 #define SCLSR_ORER     BIT(0)  /* Overrun Error */
 
 /* SCSPTR (Serial Port Register), optional */