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serial: sh-sci: Extract sci_dma_rx_reenable_irq() 

Extract the functionality to direct new serial port interrupts back to
the CPU into its own helper, to prepare for using it from a second
callsite.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2019-01-07 17:23:18 +01:00 committed by Greg Kroah-Hartman
parent 11b3770d54
commit 38766e4b61
1 changed files with 15 additions and 8 deletions
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23
drivers/tty/serial/sh-sci.c
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@ -1274,6 +1274,20 @@ static void start_hrtimer_us(struct hrtimer *hrt, unsigned long usec)
hrtimer_start(hrt, t, HRTIMER_MODE_REL);
}
static void sci_dma_rx_reenable_irq(struct sci_port *s)
{
struct uart_port *port = &s->port;
u16 scr;
/* Direct new serial port interrupts back to CPU */
scr = serial_port_in(port, SCSCR);
if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
scr &= ~SCSCR_RDRQE;
enable_irq(s->irqs[SCIx_RXI_IRQ]);
}
serial_port_out(port, SCSCR, scr | SCSCR_RIE);
}
static void sci_dma_rx_complete(void *arg)
{
struct sci_port *s = arg;
@ -1453,7 +1467,6 @@ static enum hrtimer_restart rx_timer_fn(struct hrtimer *t)
unsigned long flags;
unsigned int read;
int active, count;
u16 scr;
dev_dbg(port->dev, "DMA Rx timed out\n");
@ -1503,13 +1516,7 @@ static enum hrtimer_restart rx_timer_fn(struct hrtimer *t)
if (port->type == PORT_SCIFA || port->type == PORT_SCIFB)
sci_submit_rx(s, true);
/* Direct new serial port interrupts back to CPU */
scr = serial_port_in(port, SCSCR);
if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
scr &= ~SCSCR_RDRQE;
enable_irq(s->irqs[SCIx_RXI_IRQ]);
}
serial_port_out(port, SCSCR, scr | SCSCR_RIE);
sci_dma_rx_reenable_irq(s);
spin_unlock_irqrestore(&port->lock, flags);