From akpm@osdl.org Fri Jun 30 16:40:28 2006 Message-Id: <200606300934.k5U9YjKY001787@shell0.pdx.osdl.net> From: Frank Gevaerts Subject: USB: ipaq.c timing parameters To: greg@kroah.com Cc: akpm@osdl.org, frank.gevaerts@fks.be Date: Fri, 30 Jun 2006 02:34:45 -0700 From: Frank Gevaerts Adds configurable waiting periods to the ipaq connection code. These are not needed when the pocketpc device is running normally when plugged in, but they need extra delays if they are physically connected while rebooting. There are two parameters : * initial_wait : this is the delay before the driver attemts to start the connection. This is needed because the pocktpc device takes much longer to boot if the driver starts sending control packets too soon. * connect_retries : this is the number of times the control urb is retried before finally giving up. The patch also adds a 1 second delay between retries. I'm not sure if the cases where this patch is useful are general enough to include this in the kernel. Signed-off-by: Frank Gevaerts Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ipaq.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) --- gregkh-2.6.orig/drivers/usb/serial/ipaq.c +++ gregkh-2.6/drivers/usb/serial/ipaq.c @@ -70,6 +70,8 @@ static __u16 product, vendor; static int debug; +static int connect_retries = KP_RETRIES; +static int initial_wait; /* Function prototypes for an ipaq */ static int ipaq_open (struct usb_serial_port *port, struct file *filp); @@ -582,7 +584,7 @@ static int ipaq_open(struct usb_serial_p struct ipaq_private *priv; struct ipaq_packet *pkt; int i, result = 0; - int retries = KP_RETRIES; + int retries = connect_retries; dbg("%s - port %d", __FUNCTION__, port->number); @@ -646,6 +648,7 @@ static int ipaq_open(struct usb_serial_p port->read_urb->transfer_buffer_length = URBDATA_SIZE; port->bulk_out_size = port->write_urb->transfer_buffer_length = URBDATA_SIZE; + msleep(1000*initial_wait); /* Start reading from the device */ usb_fill_bulk_urb(port->read_urb, serial->dev, usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), @@ -672,6 +675,7 @@ static int ipaq_open(struct usb_serial_p } return 0; } + msleep(1000); } err("%s - failed doing control urb, error %d", __FUNCTION__, result); goto error; @@ -967,3 +971,9 @@ MODULE_PARM_DESC(vendor, "User specified module_param(product, ushort, 0); MODULE_PARM_DESC(product, "User specified USB idProduct"); + +module_param(connect_retries, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(connect_retries, "Maximum number of connect retries (one second each)"); + +module_param(initial_wait, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(initial_wait, "Time to wait before attempting a connection (in seconds)");