Messages in this thread Patch in this message | | | From | Geert Uytterhoeven <> | Subject | [PATCH v2 08/11] serial: sh-sci: Correct pin initialization on (H)SCIF | Date | Fri, 29 Apr 2016 14:58:31 +0200 |
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Correct pin initialization on (H)SCIF: - RTS must be deasserted (it's active low), - SCK must be an input, as it may be used as the optional external clock input.
Initial pin configuration must always be done: - Regardless of the presence of dedicated RTS and CTS pins: if the register exists, the RTS/CTS bits exist, too, - Regardless of hardware flow control being enabled or not: RTS must be deasserted.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v2: - New. --- drivers/tty/serial/sh-sci.c | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index ce7bd165929ea078..c46999f20917964e 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -712,21 +712,14 @@ static void sci_init_pins(struct uart_port *port, unsigned int cflag) return; } - /* - * For the generic path SCSPTR is necessary. Bail out if that's - * unavailable, too. - */ - if (!sci_getreg(port, SCSPTR)->size) - return; - - if ((s->cfg->capabilities & SCIx_HAVE_RTSCTS) && - ((!(cflag & CRTSCTS)))) { - unsigned short status; - - status = serial_port_in(port, SCSPTR); - status &= ~SCSPTR_CTSIO; - status |= SCSPTR_RTSIO; - serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ + if (sci_getreg(port, SCSPTR)->size) { + u16 status = serial_port_in(port, SCSPTR); + + /* RTS# is output, driven 1 */ + status |= SCSPTR_RTSIO | SCSPTR_RTSDT; + /* CTS# and SCK are inputs */ + status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO); + serial_port_out(port, SCSPTR, status); } } -- 1.9.1
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