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serial: sh-sci: Compute overrun_bit without using baud rate algo

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The overrun bit index is a property of the hardware. It's currently
computed based on a different and unrelated hardware property, the baud
rate calculation algorithm. Compute it using hardware identification
information only.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Laurent Pinchart 2013-12-06 10:59:19 +01:00 committed by Simon Horman
parent 520402bbc6
commit b545e4f406
1 changed files with 26 additions and 24 deletions
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50
drivers/tty/serial/sh-sci.c
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@ -2133,30 +2133,38 @@ static int sci_init_single(struct platform_device *dev,
sci_port->irqs[i] = p->irqs[i] ? p->irqs[i] : -ENXIO;
}
switch (p->type) {
case PORT_SCIFB:
port->fifosize = 256;
break;
case PORT_HSCIF:
port->fifosize = 128;
break;
case PORT_SCIFA:
port->fifosize = 64;
break;
case PORT_SCIF:
port->fifosize = 16;
break;
default:
port->fifosize = 1;
break;
}
if (p->regtype == SCIx_PROBE_REGTYPE) {
ret = sci_probe_regmap(p);
if (unlikely(ret))
return ret;
}
switch (p->type) {
case PORT_SCIFB:
port->fifosize = 256;
sci_port->overrun_bit = 9;
break;
case PORT_HSCIF:
port->fifosize = 128;
sci_port->overrun_bit = 0;
break;
case PORT_SCIFA:
port->fifosize = 64;
sci_port->overrun_bit = 9;
break;
case PORT_SCIF:
port->fifosize = 16;
if (p->regtype == SCIx_SH7705_SCIF_REGTYPE)
sci_port->overrun_bit = 9;
else
sci_port->overrun_bit = 0;
break;
default:
port->fifosize = 1;
sci_port->overrun_bit = 5;
break;
}
if (!early) {
sci_port->iclk = clk_get(&dev->dev, "sci_ick");
if (IS_ERR(sci_port->iclk)) {
@ -2194,12 +2202,6 @@ static int sci_init_single(struct platform_device *dev,
* Establish sensible defaults for the overrun detection, unless
* the part has explicitly disabled support for it.
*/
if (p->type == PORT_SCI)
sci_port->overrun_bit = 5;
else if (p->scbrr_algo_id == SCBRR_ALGO_4)
sci_port->overrun_bit = 9;
else
sci_port->overrun_bit = 0;
/*
* Make the error mask inclusive of overrun detection, if