From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Date: Fri, 03 Jun 2016 10:00:08 +0000 Subject: [PATCH v3 08/11] serial: sh-sci: Correct pin initialization on (H)SCIF Message-Id: <1464948011-377-9-git-send-email-geert+renesas@glider.be> List-Id: References: <1464948011-377-1-git-send-email-geert+renesas@glider.be> In-Reply-To: <1464948011-377-1-git-send-email-geert+renesas@glider.be> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Greg Kroah-Hartman , Jiri Slaby , Peter Hurley Cc: Magnus Damm , Laurent Pinchart , Yoshinori Sato , linux-serial@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven 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 --- v3: - No changes, 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