From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
Expose the CTS pin to the ->get_mctrl() callback for the
default case. Without this patch the serial core can not
retrieve the CTS pin state from the SCIF driver.
Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
---
Changes since V1:
- Return true to default to asserted state in case modem signals exist
drivers/tty/serial/sh-sci.c | 20 +++++++++++++++++++-
include/linux/serial_sci.h | 1 +
2 files changed, 20 insertions(+), 1 deletion(-)
--- 0003/drivers/tty/serial/sh-sci.c
+++ work/drivers/tty/serial/sh-sci.c 2015-03-19 09:17:37.856797004 +0900
@@ -509,6 +509,17 @@ static void sci_poll_put_char(struct uar
}
#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
+static bool sci_cts_asserted_default(struct uart_port *port)
+{
+ struct sci_port *s = to_sci_port(port);
+ struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR;
+
+ if (reg->size)
+ return !(serial_port_in(port, SCSPTR) & SCSPTR_CTSDT);
+
+ return true;
+}
+
static void sci_init_ctsrts_default(struct uart_port *port, bool hwflow_enabled)
{
struct sci_port *s = to_sci_port(port);
@@ -1239,11 +1250,18 @@ static void sci_set_mctrl(struct uart_po
static unsigned int sci_get_mctrl(struct uart_port *port)
{
+ struct sci_port *s = to_sci_port(port);
+ bool cts_asserted = false;
+
/*
* CTS/RTS is handled in hardware when supported, while nothing
* else is wired up. Keep it simple and simply assert DSR/CAR.
*/
- return TIOCM_DSR | TIOCM_CAR;
+
+ if (s->cfg->capabilities & SCIx_HAVE_RTSCTS)
+ cts_asserted = sci_cts_asserted_default(port);
+
+ return TIOCM_DSR | TIOCM_CAR | (cts_asserted ? TIOCM_CTS : 0);
}
#ifdef CONFIG_SERIAL_SH_SCI_DMA
--- 0003/include/linux/serial_sci.h
+++ work/include/linux/serial_sci.h 2015-03-19 09:15:59.446797358 +0900
@@ -59,6 +59,7 @@
#define SCSPTR_RTSIO (1 << 7) /* Serial Port RTS Pin Input/Output */
#define SCSPTR_RTSDT (1 << 6) /* Serial Port RTS Pin Data */
#define SCSPTR_CTSIO (1 << 5) /* Serial Port CTS Pin Input/Output */
+#define SCSPTR_CTSDT (1 << 4) /* Serial Port CTS Pin Data */
#define SCSPTR_SPB2IO (1 << 1) /* Serial Port Break Input/Output */
#define SCSPTR_SPB2DT (1 << 0) /* Serial Port Break Data */
--
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