Commit 8b6ff84c authored by Hisashi Nakamura's avatar Hisashi Nakamura Committed by Greg Kroah-Hartman
Browse files

serial: sh-sci: Fix R-Car SCIF and HSCIF overrun handling 



When fifo overrun happened, the interrupt status refers to
SCLSR register in R-Car SCIF and HSCIF.
Thus, overrun handling takes SCLSR register into account.

Signed-off-by: default avatarHisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: default avatarYoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 51b31f1c

drivers/tty/serial/sh-sci.c

+13 −1
Original line number Diff line number Diff line
@@ -997,12 +997,15 @@ static inline unsigned long port_rx_irq_mask(struct uart_port *port) 
static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)

{

	unsigned short ssr_status, scr_status, err_enabled;

	unsigned short slr_status = 0;

	struct uart_port *port = ptr;

	struct sci_port *s = to_sci_port(port);

	irqreturn_t ret = IRQ_NONE;



	ssr_status = serial_port_in(port, SCxSR);

	scr_status = serial_port_in(port, SCSCR);

	if (port->type == PORT_SCIF || port->type == PORT_HSCIF)

		slr_status = serial_port_in(port, SCLSR);

	err_enabled = scr_status & port_rx_irq_mask(port);



	/* Tx Interrupt */
@@ -1015,8 +1018,11 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) 
	 * DR flags

	 */

	if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) &&

	    (scr_status & SCSCR_RIE))

	    (scr_status & SCSCR_RIE)) {

		if (port->type == PORT_SCIF || port->type == PORT_HSCIF)

			sci_handle_fifo_overrun(port);

		ret = sci_rx_interrupt(irq, ptr);

	}



	/* Error Interrupt */

	if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled)
@@ -1026,6 +1032,12 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) 
	if ((ssr_status & SCxSR_BRK(port)) && err_enabled)

		ret = sci_br_interrupt(irq, ptr);



	/* Overrun Interrupt */

	if (port->type == PORT_SCIF || port->type == PORT_HSCIF) {

		if (slr_status & 0x01)

			sci_handle_fifo_overrun(port);

	}



	return ret;

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE