USB: cypress_m8: allow unstable baud rates (c312659c) · Commits · 戴 / test

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>

drivers/usb/serial/cypress_m8.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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");

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