1
linux/drivers/usb
Alan Stern 6ea12a04d2 USB: OHCI: fix another regression for NVIDIA controllers
The NVIDIA series of OHCI controllers continues to be troublesome.  A
few people using the MCP67 chipset have reported that even with the
most recent kernels, the OHCI controller fails to handle new
connections and spams the system log with "unable to enumerate USB
port" messages.  This is different from the other problems previously
reported for NVIDIA OHCI controllers, although it is probably related.

It turns out that the MCP67 controller does not like to be kept in the
RESET state very long.  After only a few seconds, it decides not to
work any more.  This patch (as1479) changes the PCI initialization
quirk code so that NVIDIA controllers are switched into the SUSPEND
state after 50 ms of RESET.  With no interrupts enabled and all the
downstream devices reset, and thus unable to send wakeup requests,
this should be perfectly safe (even for non-NVIDIA hardware).

The removal code in ohci-hcd hasn't been changed; it will still leave
the controller in the RESET state.  As a result, if someone unloads
ohci-hcd and then reloads it, the controller won't work again until
the system is rebooted.  If anybody complains about this, the removal
code can be updated similarly.

This fixes Bugzilla #22052.

Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-07-16 11:34:44 +02:00
..
atm drivers: usb: atm: ueagle-atm: Add missing const qualifier 2011-07-08 14:51:30 -07:00
c67x00
class usb/class: use printk_ratelimited() instead of printk_ratelimit() 2011-07-01 14:43:24 -07:00
core Merge 3.0-rc2 into usb-linus as it's needed by some USB patches 2011-06-14 06:51:23 -07:00
early USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
gadget Merge branch 'for-next' of master.kernel.org:/pub/scm/linux/kernel/git/balbi/usb into usb-next 2011-07-08 15:30:55 -07:00
host USB: OHCI: fix another regression for NVIDIA controllers 2011-07-16 11:34:44 +02:00
image
misc Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
mon USB: mon: Allow to use usbmon without debugfs 2011-07-08 14:55:09 -07:00
musb usb: musb: restore INDEX register in resume path 2011-07-08 12:47:25 +03:00
otg USB: OTG: Use work_queue in set_vbus for TWL6030 transciever 2011-07-01 14:45:43 -07:00
renesas_usbhs usb: renesas_usbhs: support multi driver 2011-07-08 15:08:19 -07:00
serial USB: PL2303: correctly handle baudrates above 115200 2011-07-08 14:58:27 -07:00
storage Realtek cr: Add autosuspend function. 2011-07-01 14:53:42 -07:00
wusbcore wusb: use printk_ratelimited() instead of printk_ratelimit() 2011-07-01 14:43:25 -07:00
Kconfig usb: renesas_usbhs: compile/config are rescued 2011-07-08 14:57:12 -07:00
Makefile USB: fix build of FSL MPH DR OF platform driver 2011-05-02 16:59:37 -07:00
README
usb-skeleton.c

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("khubd").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.