USB: serial: cp210x: clean up CRTSCTS flag code
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.shkolnyy@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index a33a426..df18082 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -995,34 +995,22 @@
dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
__func__, ctl_hs, flow_repl);
+ ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
+ ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
+ ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
+ ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
+ ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
if (cflag & CRTSCTS) {
- ctl_hs &= ~(CP210X_SERIAL_DTR_MASK |
- CP210X_SERIAL_CTS_HANDSHAKE |
- CP210X_SERIAL_DSR_HANDSHAKE |
- CP210X_SERIAL_DCD_HANDSHAKE |
- CP210X_SERIAL_DSR_SENSITIVITY);
- ctl_hs |= CP210X_SERIAL_DTR_SHIFT(
- CP210X_SERIAL_DTR_ACTIVE);
ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
- /*
- * FIXME: Why clear bits unrelated to flow control.
- * Why clear CP210X_SERIAL_XOFF_CONTINUE which is
- * never set
- */
- flow_repl = 0;
+
+ flow_repl &= ~CP210X_SERIAL_RTS_MASK;
flow_repl |= CP210X_SERIAL_RTS_SHIFT(
CP210X_SERIAL_RTS_FLOW_CTL);
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
} else {
- ctl_hs &= ~(CP210X_SERIAL_DTR_MASK |
- CP210X_SERIAL_CTS_HANDSHAKE |
- CP210X_SERIAL_DSR_HANDSHAKE |
- CP210X_SERIAL_DCD_HANDSHAKE |
- CP210X_SERIAL_DSR_SENSITIVITY);
- ctl_hs |= CP210X_SERIAL_DTR_SHIFT(
- CP210X_SERIAL_DTR_ACTIVE);
- /* FIXME: Why clear bits unrelated to flow control */
- flow_repl &= 0xffffff00;
+ ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
+
+ flow_repl &= ~CP210X_SERIAL_RTS_MASK;
flow_repl |= CP210X_SERIAL_RTS_SHIFT(
CP210X_SERIAL_RTS_ACTIVE);
dev_dbg(dev, "%s - flow control = NONE\n", __func__);