tree 51cfe6ca9293b9484108ed757ec3c43eb5328474
parent 6c1b445c226dd82d0961725dec8051b95003723a
author Alan Stern <stern@rowland.harvard.edu> 1114195152 -0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1119908624 -0700

[PATCH] USB UHCI: improved reset handling

This patch improves the strategy uhci-hcd uses for performing controller
resets and checking whether they are needed.

	The HCRESET command doesn't affect the Suspend, Resume,
	or Reset bits in the port status & control registers, so
	the driver must clear them by itself.  This means the
	code to figure out how many ports there are has to be moved
	to an earlier spot in the driver.

	The R/WC bits in the USBLEGSUP register can be set by the
	hardware even in the absence of BIOS meddling with legacy
	support features.  Hence it's not a good idea to check them
	while trying to determine whether the BIOS has altered the
	controller's state.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>