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

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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>
This commit is contained in:
Hisashi Nakamura 2015-01-26 21:25:48 +09:00 committed by Greg Kroah-Hartman
parent 51b31f1c6b
commit 8b6ff84c2d
1 changed files with 13 additions and 1 deletions
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14
drivers/tty/serial/sh-sci.c
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@ -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;
}