[PATCH] serial: sh-sci: fix hardware RX trigger level setting
From: Ulrich Hecht <hidden>
Date: 2017-02-08 17:31:53
Also in:
linux-renesas-soc
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
1. Do not set the RX trigger level for software timeout devices on reset; there is no timeout by default, and data will rot. 2. Do set the RX trigger level for hardware timeout devices when set via sysfs attribute. Fixes SCIFA-type serial consoles. Signed-off-by: Ulrich Hecht <redacted> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/tty/serial/sh-sci.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index f95a56c..9a47cc4 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c@@ -1076,8 +1076,11 @@ static ssize_t rx_trigger_store(struct device *dev, if (kstrtol(buf, 0, &r) == -EINVAL) return -EINVAL; + sci->rx_trigger = scif_set_rtrg(port, r); - scif_set_rtrg(port, 1); + if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) + scif_set_rtrg(port, 1); + return count; }
@@ -2179,7 +2182,11 @@ static void sci_reset(struct uart_port *port) setup_timer(&s->rx_fifo_timer, rx_fifo_timer_fn, (unsigned long)s); } else { - scif_set_rtrg(port, s->rx_trigger); + if (port->type == PORT_SCIFA || + port->type == PORT_SCIFB) + scif_set_rtrg(port, 1); + else + scif_set_rtrg(port, s->rx_trigger); } } }
--
2.7.4