The CRTSCTS flag code cleared (and inconsistently) bits unrelated to
CRTSCTS functionality. It was also harder than necessary to read.
Signed-off-by: Konstantin Shkolnyy <konstantin.shkol...@gmail.com>
---
Changes in v2:
Improved CRTSCTS fix based on feedback. Dropped get_termios error handling.
drivers/usb/serial/cp210x.c | 23 ++++++++++-------------
1 file changed, 10 insertions(+), 13 deletions(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index da0567c..d3e1dd2 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -988,24 +988,21 @@ static void cp210x_set_termios(struct tty_struct *tty,
dev_dbg(dev, "%s - read ulControlHandshake=%08x
ulFlowReplace=%08x\n",
__func__, ControlHandshake, FlowReplace);
+ ControlHandshake &= ~SERIAL_DSR_HANDSHAKE;
+ ControlHandshake &= ~SERIAL_DCD_HANDSHAKE;
+ ControlHandshake &= ~SERIAL_DSR_SENSITIVITY;
+ ControlHandshake &= ~SERIAL_DTR_MASK;
+ ControlHandshake |= SERIAL_DTR_ACTIVE;
if (cflag & CRTSCTS) {
- ControlHandshake &= ~(SERIAL_DTR_MASK |
- SERIAL_CTS_HANDSHAKE | SERIAL_DSR_HANDSHAKE |
- SERIAL_DCD_HANDSHAKE | SERIAL_DSR_SENSITIVITY);
- ControlHandshake |= SERIAL_DTR_ACTIVE;
ControlHandshake |= SERIAL_CTS_HANDSHAKE;
- /* FIXME why clear bits unrelated to flow control */
- /* FIXME why clear _XOFF_CONTINUE which is never set */
- FlowReplace &= ~0xffffffff;
+
+ FlowReplace &= ~SERIAL_RTS_MASK;
FlowReplace |= SERIAL_RTS_FLOW_CTL;
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
} else {
- ControlHandshake &= ~(SERIAL_DTR_MASK |
- SERIAL_CTS_HANDSHAKE | SERIAL_DSR_HANDSHAKE |
- SERIAL_DCD_HANDSHAKE | SERIAL_DSR_SENSITIVITY);
- ControlHandshake |= SERIAL_DTR_ACTIVE;
- /* FIXME - why clear bits unrelated to flow control */
- FlowReplace &= ~0xff;
+ ControlHandshake &= ~SERIAL_CTS_HANDSHAKE;
+
+ FlowReplace &= ~SERIAL_RTS_MASK;
FlowReplace |= SERIAL_RTS_ACTIVE;
dev_dbg(dev, "%s - flow control = NONE\n", __func__);
}
--
1.8.4.5
