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: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 8b6ff84c2d445a476be5f5493b9deac00271eedd)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 508bdb5..5b50c79 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -997,12 +997,15 @@
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 @@
* 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 @@
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;
}
