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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>
This commit is contained in:
Geert Uytterhoeven 2016-06-24 16:59:16 +02:00 committed by Greg Kroah-Hartman
parent 2768cf4287
commit fc2af3348a
2 changed files with 6 additions and 0 deletions
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5
drivers/tty/serial/sh-sci.c
View File

@ -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,

1
drivers/tty/serial/sh-sci.h
View File

@ -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 */