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authorAidan Thornton <makosoft@gmail.com>2016-10-22 22:02:24 +0100
committerJohan Hovold <johan@kernel.org>2016-10-24 17:41:19 +0200
commit4e46c410e050bcac36deadbd8e20449d078204e8 (patch)
treeffc3cf3d454113b9a6447c351788299b044b781a /drivers/usb/serial/ch341.c
parent6fde8d29b0424f292a4ec5dbce01458ad759a41f (diff)
downloadlinux-4e46c410e050bcac36deadbd8e20449d078204e8.tar.bz2
USB: serial: ch341: reinitialize chip on reconfiguration
Changing the LCR register after initialization does not seem to be reliable on all chips (particularly not on CH341A). Restructure initialization and configuration to always reinit the chip on configuration changes instead and pass the LCR register value directly to the initialization command. (Note that baud rates above 500kbaud are incorrect, but they're incorrect in the same way both before and after this patch at least on the CH340G. Fixing this isn't a priority as higher baud rates don't seem that reliable anyway.) Cleaned-up version of a patch by Grigori Goronzy Signed-off-by: Aidan Thornton <makosoft@gmail.com> Reviewed-by: Grigori Goronzy <greg@chown.ath.cx> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/ch341.c')
-rw-r--r--drivers/usb/serial/ch341.c37
1 files changed, 20 insertions, 17 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index bdf525fe7807..096bc070635a 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -132,10 +132,10 @@ static int ch341_control_in(struct usb_device *dev,
return r;
}
-static int ch341_set_baudrate(struct usb_device *dev,
- struct ch341_private *priv)
+static int ch341_init_set_baudrate(struct usb_device *dev,
+ struct ch341_private *priv, unsigned ctrl)
{
- short a, b;
+ short a;
int r;
unsigned long factor;
short divisor;
@@ -155,11 +155,10 @@ static int ch341_set_baudrate(struct usb_device *dev,
factor = 0x10000 - factor;
a = (factor & 0xff00) | divisor;
- b = factor & 0xff;
- r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a);
- if (!r)
- r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x0f2c, b);
+ /* 0x9c is "enable SFR_UART Control register and timer" */
+ r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT,
+ 0x9c | (ctrl << 8), a | 0x80);
return r;
}
@@ -218,10 +217,6 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
if (r < 0)
goto out;
- r = ch341_set_baudrate(dev, priv);
- if (r < 0)
- goto out;
-
/* expect two bytes 0x56 0x00 */
r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x2518, 0, buffer, size);
if (r < 0)
@@ -236,11 +231,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
if (r < 0)
goto out;
- r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0x501f, 0xd90a);
- if (r < 0)
- goto out;
-
- r = ch341_set_baudrate(dev, priv);
+ r = ch341_init_set_baudrate(dev, priv, 0);
if (r < 0)
goto out;
@@ -355,16 +346,28 @@ static void ch341_set_termios(struct tty_struct *tty,
struct ch341_private *priv = usb_get_serial_port_data(port);
unsigned baud_rate;
unsigned long flags;
+ unsigned char ctrl;
+ int r;
+
+ /* redundant changes may cause the chip to lose bytes */
+ if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
+ return;
baud_rate = tty_get_baud_rate(tty);
priv->baud_rate = baud_rate;
+ ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
+
if (baud_rate) {
spin_lock_irqsave(&priv->lock, flags);
priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
spin_unlock_irqrestore(&priv->lock, flags);
- ch341_set_baudrate(port->serial->dev, priv);
+ r = ch341_init_set_baudrate(port->serial->dev, priv, ctrl);
+ if (r < 0 && old_termios) {
+ priv->baud_rate = tty_termios_baud_rate(old_termios);
+ tty_termios_copy_hw(&tty->termios, old_termios);
+ }
} else {
spin_lock_irqsave(&priv->lock, flags);
priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);