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USB: ftdi_sio: clean up ftdi_set_max_packet_size()

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Code and comment style clean ups of ftdi_set_max_packet_size().

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2014-06-05 16:05:55 +02:00
parent a90d84adb4
commit 47e575952b
1 changed files with 13 additions and 11 deletions
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24
drivers/usb/serial/ftdi_sio.c
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@ -1556,16 +1556,16 @@ static void ftdi_determine_type(struct usb_serial_port *port)
}
/* Determine the maximum packet size for the device. This depends on the chip
* type and the USB host capabilities. The value should be obtained from the
* device descriptor as the chip will use the appropriate values for the host.*/
/*
* Determine the maximum packet size for the device. This depends on the chip
* type and the USB host capabilities. The value should be obtained from the
* device descriptor as the chip will use the appropriate values for the host.
*/
static void ftdi_set_max_packet_size(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct usb_interface *interface = serial->interface;
struct usb_interface *interface = port->serial->interface;
struct usb_endpoint_descriptor *ep_desc;
unsigned num_endpoints;
unsigned i;
@ -1573,20 +1573,22 @@ static void ftdi_set_max_packet_size(struct usb_serial_port *port)
if (!num_endpoints)
return;
/* NOTE: some customers have programmed FT232R/FT245R devices
* with an endpoint size of 0 - not good. In this case, we
/*
* NOTE: Some customers have programmed FT232R/FT245R devices
* with an endpoint size of 0 - not good. In this case, we
* want to override the endpoint descriptor setting and use a
* value of 64 for wMaxPacketSize */
* value of 64 for wMaxPacketSize.
*/
for (i = 0; i < num_endpoints; i++) {
ep_desc = &interface->cur_altsetting->endpoint[i].desc;
if (ep_desc->wMaxPacketSize == 0) {
if (!ep_desc->wMaxPacketSize) {
ep_desc->wMaxPacketSize = cpu_to_le16(0x40);
dev_warn(&port->dev, "Overriding wMaxPacketSize on endpoint %d\n",
usb_endpoint_num(ep_desc));
}
}
/* set max packet size based on descriptor */
/* Set max packet size based on last descriptor. */
priv->max_packet_size = usb_endpoint_maxp(ep_desc);
}