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serial: sh-sci: Clear RX, error, and break flags during reset

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Setting the FIFO reset bits is not sufficient to reset the RX FIFO.
After this the status register's RDF flag bit may still be set, causing
the reception of one stale byte of data.

To fix this, clear all status flag bits related to reception, error, and
break handling, 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 16:59:15 +02:00 committed by Greg Kroah-Hartman
parent 44763d3d30
commit 2768cf4287
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/sh-sci.c
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@ -2152,6 +2152,10 @@ static void sci_reset(struct uart_port *port)
reg = sci_getreg(port, SCFCR);
if (reg->size)
serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
sci_clear_SCxSR(port,
SCxSR_RDxF_CLEAR(port) & SCxSR_ERROR_CLEAR(port) &
SCxSR_BREAK_CLEAR(port));
}
static void sci_set_termios(struct uart_port *port, struct ktermios *termios,