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Thread-Topic: [PATCH] USB: otg: Fix error 32 when enable hardware flow control. 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Signed-off-by: Pho Tran --- drivers/usb/serial/cp210x.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index fbb10dfc56e3..f231cecdaf7d 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -1204,6 +1204,7 @@ static int cp210x_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct usb_serial_port *port =3D tty->driver_data; + return cp210x_tiocmset_port(port, set, clear); } =20 @@ -1211,6 +1212,11 @@ static int cp210x_tiocmset_port(struct usb_serial_po= rt *port, unsigned int set, unsigned int clear) { u16 control =3D 0; + struct cp210x_flow_ctl flow_ctl; + u32 ctl_hs =3D 0; + u32 flow_repl =3D 0; + bool auto_dtr =3D false; + bool auto_rts =3D false; =20 if (set & TIOCM_RTS) { control |=3D CONTROL_RTS; @@ -1230,6 +1236,30 @@ static int cp210x_tiocmset_port(struct usb_serial_po= rt *port, } =20 dev_dbg(&port->dev, "%s - control =3D 0x%.4x\n", __func__, control); + /* + * Don't send MHS command if device in hardware flowcontrol mode + */ + cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, + sizeof(flow_ctl)); + ctl_hs =3D le32_to_cpu(flow_ctl.ulControlHandshake); + flow_repl =3D le32_to_cpu(flow_ctl.ulFlowReplace); + + if (CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_FLOW_CTL) + =3D=3D (ctl_hs & CP210X_SERIAL_DTR_MASK)) + auto_dtr =3D true; + else + auto_dtr =3D false; + + if (CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL) + =3D=3D (flow_repl & CP210X_SERIAL_RTS_MASK)) + auto_rts =3D true; + else + auto_rts =3D false; + + if (auto_dtr || auto_rts) { + dev_dbg(&port->dev, "Don't set MHS when while device in flow control mod= e\n"); + return 0; + } =20 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); } @@ -1256,7 +1286,7 @@ static int cp210x_tiocmget(struct tty_struct *tty) |((control & CONTROL_RTS) ? TIOCM_RTS : 0) |((control & CONTROL_CTS) ? TIOCM_CTS : 0) |((control & CONTROL_DSR) ? TIOCM_DSR : 0) - |((control & CONTROL_RING)? TIOCM_RI : 0) + |((control & CONTROL_RING) ? TIOCM_RI : 0) |((control & CONTROL_DCD) ? TIOCM_CD : 0); =20 dev_dbg(&port->dev, "%s - control =3D 0x%.2x\n", __func__, control); --=20 2.17.1=