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authorMike Isely <isely@pobox.com>2006-08-30 07:06:59 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-27 22:58:58 +0400
commit0257fa9ffe4f0287a9d90476bb733cfc2272396e (patch)
tree323e08e486099d996be410e36a4d7ba927688956 /drivers/usb/serial/cypress_m8.c
parent13f4db9e1bf0a6efcdbbb3a1e4da8a1a8c620fff (diff)
downloadlinux-0257fa9ffe4f0287a9d90476bb733cfc2272396e.tar.xz
cypress_m8: use appropriate URB polling interval
The polling interval for the device can't always be 1msec. If it is too quick, the device can fail causing a fatal (to the driver) EILSEQ error from the USB core. The actual correct value is reported by the device as part of its configuration data, so use that value as the default. On a DeLorme Earthmate for example, the device reports that it wants a 6msec interval. As part of this fix, the "interval" module option has been fixed as well; the device's default can be overridden by specifying interval=<value> as a module option. Signed-off-by: Mike Isely <isely@pobox.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/cypress_m8.c')
-rw-r--r--drivers/usb/serial/cypress_m8.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index ee70fddcab60..40cfbe1d3517 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -129,6 +129,8 @@ struct cypress_private {
int cmd_ctrl; /* always set this to 1 before issuing a command */
struct cypress_buf *buf; /* write buffer */
int write_urb_in_use; /* write urb in use indicator */
+ int write_urb_interval; /* interval to use for write urb */
+ int read_urb_interval; /* interval to use for read urb */
int termios_initialized;
__u8 line_control; /* holds dtr / rts value */
__u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
@@ -472,8 +474,9 @@ static unsigned rate_to_mask (int rate)
static int generic_startup (struct usb_serial *serial)
{
struct cypress_private *priv;
+ struct usb_serial_port *port = serial->port[0];
- dbg("%s - port %d", __FUNCTION__, serial->port[0]->number);
+ dbg("%s - port %d", __FUNCTION__, port->number);
priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
if (!priv)
@@ -489,13 +492,24 @@ static int generic_startup (struct usb_serial *serial)
usb_reset_configuration (serial->dev);
- interval = 1;
priv->cmd_ctrl = 0;
priv->line_control = 0;
priv->termios_initialized = 0;
priv->rx_flags = 0;
priv->cbr_mask = B300;
- usb_set_serial_port_data(serial->port[0], priv);
+ if (interval > 0) {
+ priv->write_urb_interval = interval;
+ priv->read_urb_interval = interval;
+ dbg("%s - port %d read & write intervals forced to %d",
+ __FUNCTION__,port->number,interval);
+ } else {
+ priv->write_urb_interval = port->interrupt_out_urb->interval;
+ priv->read_urb_interval = port->interrupt_in_urb->interval;
+ dbg("%s - port %d intervals: read=%d write=%d",
+ __FUNCTION__,port->number,
+ priv->read_urb_interval,priv->write_urb_interval);
+ }
+ usb_set_serial_port_data(port, priv);
return 0;
}
@@ -624,7 +638,7 @@ static int cypress_open (struct usb_serial_port *port, struct file *filp)
usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
- cypress_read_int_callback, port, interval);
+ cypress_read_int_callback, port, priv->read_urb_interval);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result){
@@ -808,7 +822,7 @@ send:
port->interrupt_out_urb->transfer_buffer_length = actual_size;
port->interrupt_out_urb->dev = port->serial->dev;
- port->interrupt_out_urb->interval = interval;
+ port->interrupt_out_urb->interval = priv->write_urb_interval;
result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
@@ -1349,7 +1363,7 @@ continue_read:
port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer,
port->interrupt_in_urb->transfer_buffer_length,
- cypress_read_int_callback, port, interval);
+ cypress_read_int_callback, port, priv->read_urb_interval);
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev, "%s - failed resubmitting "