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| author | Ulrich Hecht <ulrich.hecht+renesas@gmail.com> | 2017-02-03 13:38:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-06 11:47:51 +0300 |
| commit | 18e8cf159177100e69d528293f8cf6875c0b1bca (patch) | |
| tree | 98f5e4c8769d3f41ae6f888abab88370b9b19b7c /drivers/tty | |
| parent | 8ee3fde047589dc9c201251f07d0ca1dc776feca (diff) | |
| download | linux-18e8cf159177100e69d528293f8cf6875c0b1bca.tar.xz | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 050d028cf2a1..520e344a811d 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -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. |