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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>
This commit is contained in:
Konstantin Shkolnyy 2016-05-04 16:57:11 -05:00 committed by Johan Hovold
parent 9034389cd8
commit ab5701ada2
1 changed files with 10 additions and 22 deletions
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32
drivers/usb/serial/cp210x.c
View File

@ -995,34 +995,22 @@ static void cp210x_set_termios(struct tty_struct *tty,
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__);