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serial: sh-sci: increase RX FIFO trigger defaults for (H)SCIF 

Sets reasonable trigger defaults for the various SCIF variants.
Also corrects the FIFO size for SH7705-style ports.

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Ulrich Hecht 2017-02-03 11:38:17 +01:00 committed by Greg Kroah-Hartman
parent 8ee3fde047
commit 18e8cf1591
1 changed files with 28 additions and 1 deletions
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29
drivers/tty/serial/sh-sci.c
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@ -148,6 +148,7 @@ struct sci_port {
struct timer_list rx_timer;
unsigned int rx_timeout;
#endif
int rx_trigger;
bool has_rtscts;
bool autorts;
@ -450,7 +451,7 @@ static const struct sci_port_params sci_port_params[SCIx_NR_REGTYPES] = {
[SCFCR] = { 0x18, 16 },
[SCFDR] = { 0x1c, 16 },
},
.fifosize = 16,
.fifosize = 64,
.overrun_reg = SCxSR,
.overrun_mask = SCIFA_ORER,
.sampling_rate_mask = SCI_SR(16),
@ -2062,6 +2063,7 @@ static void sci_reset(struct uart_port *port)
{
const struct plat_sci_reg *reg;
unsigned int status;
struct sci_port *s = to_sci_port(port);
do {
status = serial_port_in(port, SCxSR);
@ -2081,6 +2083,9 @@ static void sci_reset(struct uart_port *port)
status &= ~(SCLSR_TO | SCLSR_ORER);
serial_port_out(port, SCLSR, status);
}
if (s->rx_trigger > 1)
scif_set_rtrg(port, s->rx_trigger);
}
static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
@ -2615,6 +2620,28 @@ static int sci_init_single(struct platform_device *dev,
if (unlikely(sci_port->params == NULL))
return -EINVAL;
switch (p->type) {
case PORT_SCIFB:
sci_port->rx_trigger = 48;
break;
case PORT_HSCIF:
sci_port->rx_trigger = 64;
break;
case PORT_SCIFA:
sci_port->rx_trigger = 32;
break;
case PORT_SCIF:
if (p->regtype == SCIx_SH7705_SCIF_REGTYPE)
/* RX triggering not implemented for this IP */
sci_port->rx_trigger = 1;
else
sci_port->rx_trigger = 8;
break;
default:
sci_port->rx_trigger = 1;
break;
}
/* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't
* match the SoC datasheet, this should be investigated. Let platform
* data override the sampling rate for now.