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USB: cypress_m8: allow unstable baud rates

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I've got a crappy cypress converter here, and while running at higher
baud rates craps out on throughput, it works fine with lower ones.
While it'd be nice to simply use a lower baud rate, not all devices
can be configured this way, and it is possible to (slowly) interact
at higher rates by sending a byte at a time.  So let people force
higher rates when they need it via a module parameter.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mike Frysinger 2009-12-18 16:33:03 -05:00 committed by Greg Kroah-Hartman
parent 2805eb13c3
commit c312659c5f
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/serial/cypress_m8.c
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@ -73,6 +73,7 @@
static int debug;
static int stats;
static int interval;
static int unstable_bauds;
/*
* Version Information
@ -291,6 +292,9 @@ static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
struct cypress_private *priv;
priv = usb_get_serial_port_data(port);
if (unstable_bauds)
return new_rate;
/*
* The general purpose firmware for the Cypress M8 allows for
* a maximum speed of 57600bps (I have no idea whether DeLorme
@ -1643,3 +1647,5 @@ module_param(stats, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(stats, "Enable statistics or not");
module_param(interval, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(interval, "Overrides interrupt interval");
module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");