From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> Fix the default SCIF handling in case CTS/RTS is available on the target board but disabled by user space. Without this patch the RTS output value is not set. Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> --- Changes since V1: - When modem control is disabled, set RTS to zero to keep it asserted. drivers/tty/serial/sh-sci.c | 7 +++++-- include/linux/serial_sci.h | 1 + 2 files changed, 6 insertions(+), 2 deletions(-) --- 0002/drivers/tty/serial/sh-sci.c +++ work/drivers/tty/serial/sh-sci.c 2015-03-19 09:13:03.186797991 +0900 @@ -522,10 +522,13 @@ static void sci_init_ctsrts_default(stru if (!reg->size || hwflow_enabled) return; + /* Setup CTS/RTS in the case hardware flow is disabled by user space. + * The CTS signal is setup as input and RTS as output with value 0. + */ status = serial_port_in(port, SCSPTR); - status &= ~SCSPTR_CTSIO; + status &= ~(SCSPTR_CTSIO | SCSPTR_RTSDT); status |= SCSPTR_RTSIO; - serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ + serial_port_out(port, SCSPTR, status); /* Set RTS = 0 */ } static void sci_init_pins(struct uart_port *port, unsigned int cflag) --- 0001/include/linux/serial_sci.h +++ work/include/linux/serial_sci.h 2015-03-19 09:11:14.936798380 +0900 @@ -57,6 +57,7 @@ /* SCSPTR (Serial Port Register), optional */ #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_SPB2IO (1 << 1) /* Serial Port Break Input/Output */ #define SCSPTR_SPB2DT (1 << 0) /* Serial Port Break Data */ -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
