From: Geert Uytterhoeven Date: Tue, 28 Mar 2017 09:13:45 +0000 (+0200) Subject: serial: sh-sci: Fix late enablement of AUTORTS X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=5f76895e4c712b1b5af450cf344389b8c53ac2c2;p=openwrt%2Fstaging%2Fblogic.git serial: sh-sci: Fix late enablement of AUTORTS When changing hardware control flow for a UART with dedicated RTS/CTS pins, the new AUTORTS state is not immediately reflected in the hardware, but only when RTS is raised. However, the serial core does not call .set_mctrl() after .set_termios(), hence AUTORTS may only become effective when the port is closed, and reopened later. Note that this problem does not happen when manually using stty to change CRTSCTS, as AUTORTS will work fine on next open. To fix this, call .set_mctrl() from .set_termios() when dedicated RTS/CTS pins are present, to refresh the AUTORTS or RTS state. This is similar to what other drivers supporting AUTORTS do (e.g. omap-serial). Reported-by: Baumann, Christoph (C.) Fixes: 33f50ffc253854cf ("serial: sh-sci: Fix support for hardware-assisted RTS/CTS") Signed-off-by: Geert Uytterhoeven Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 446a23bee140..6e405fb5a23f 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -2372,6 +2372,10 @@ done: serial_port_out(port, SCFCR, ctrl); } + if (port->flags & UPF_HARD_FLOW) { + /* Refresh (Auto) RTS */ + sci_set_mctrl(port, port->mctrl); + } scr_val |= SCSCR_RE | SCSCR_TE | (s->cfg->scscr & ~(SCSCR_CKE1 | SCSCR_CKE0));