Non-hub device has no child, and even a real USB hub has ports far
less than USB_MAXCHILDREN, so there is no need using a fix array for
child devices, just allocate it dynamically according real port
number.
Signed-off-by: NHuajun Li <huajun.li.lee@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The superspeed device attached to a USB 3.0 hub(such as VIA's)
doesn't respond the address device command after resume. The
root cause is the superspeed hub will miss the Hub Depth value
that is used as an offset into the route string to locate the
bits it uses to determine the downstream port number after
reset, and all packets can't be routed to the device attached
to the superspeed hub.

Hub driver sends a Set Hub Depth request to the superspeed hub
except for USB 3.0 root hub when the hub is initialized and
doesn't send the request again after reset due to the resume
process. So moving the code that sends the Set Hub Depth request
to the superspeed hub from hub_configure() to hub_activate()
is to cover those situations include initialization and reset.

The patch should be backported to kernels as old as 2.6.39.
Signed-off-by: NElric Fu <elricfu1@gmail.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org

Now that USB 3.0 hub remote wakeup on port status changes is enabled,
and USB 3.0 device remote wakeup is handled in the USB core properly,
let's turn on auto-suspend for all USB 3.0 hubs.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

This patch takes care of the race condition between the Function Wake
Device Notification and the auto-suspend timeout for this situation:

Roothub
  | (U3)
hub A
  | (U3)
hub B
  | (U3)
device C

When device C signals a resume, the xHCI driver will set the wakeup_bits
for the roothub port that hub A is attached to.  However, since USB 3.0
hubs do not set a link state change bit on device-initiated resume, hub
A will not indicate a port event when polled.  Without this patch, khubd
will notice the wakeup-bits are set for the roothub port, it will resume
hub A, and then it will poll the events bits for hub A and notice that
nothing has changed.  Then it will be suspended after 2 seconds.

Change hub_activate() to look at the port link state for each USB 3.0
hub port, and set hub->change_bits if the link state is U0, indicating
the device has finished resume.  Change the resume function called by
hub_events(), hub_handle_remote_wakeup(), to check the link status
for resume instead of just the port's wakeup_bits.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

USB 3.0 hubs don't have a port suspend change bit (that bit is now
reserved).  Instead, when a host-initiated resume finishes, the hub sets
the port link state change bit.

When a USB 3.0 device initiates remote wakeup, the parent hubs with
their upstream links in U3 will pass the LFPS up the chain.  The first
hub that has an upstream link in U0 (which may be the roothub) will
reflect that LFPS back down the path to the device.

However, the parent hubs in the resumed path will not set their link
state change bit.  Instead, the device that initiated the resume has to
send an asynchronous "Function Wake" Device Notification up to the host
controller.  Therefore, we need a way to notify the USB core of a device
resume without going through the normal hub URB completion method.

First, make the xHCI roothub act like an external USB 3.0 hub and not
pass up the port link state change bit when a device-initiated resume
finishes.  Introduce a new xHCI bit field, port_remote_wakeup, so that
we can tell the difference between a port coming out of the U3Exit state
(host-initiated resume) and the RExit state (ending state of
device-initiated resume).

Since the USB core can't tell whether a port on a hub has resumed by
looking at the Hub Status buffer, we need to introduce a bitfield,
wakeup_bits, that indicates which ports have resumed.  When the xHCI
driver notices a port finishing a device-initiated resume, we call into
a new USB core function, usb_wakeup_notification(), that will set
the right bit in wakeup_bits, and kick khubd for that hub.

We also call usb_wakeup_notification() when the Function Wake Device
Notification is received by the xHCI driver.  This covers the case where
the link between the roothub and the first-tier hub is in U0, and the
hub reflects the resume signaling back to the device without giving any
indication it has done so until the device sends the Function Wake
notification.

Change the code in khubd that handles the remote wakeup to look at the
state the USB core thinks the device is in, and handle the remote wakeup
if the port's wakeup bit is set.

This patch only takes care of the case where the device is attached
directly to the roothub, or the USB 3.0 hub that is attached to the root
hub is the device sending the Function Wake Device Notification (e.g.
because a new USB device was attached).  The other cases will be covered
in a second patch.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

Refactor the code to check for a remote wakeup on a port into its own
function.  Keep the behavior the same, and set connect_change in
hub_events if the device disconnected on resume.  Cleanup references to
hdev->children[i-1] to use a common variable.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

USB 3.0 hubs have a different remote wakeup policy than USB 2.0 hubs.
USB 2.0 hubs, once they have remote wakeup enabled, will always send
remote wakes when anything changes on a port.

However, USB 3.0 hubs have a per-port remote wake up policy that is off
by default.  The Set Feature remote wake mask can be changed for any
port, enabling remote wakeup for a connect, disconnect, or overcurrent
event, much like EHCI and xHCI host controller "wake on" port status
bits.  The bits are cleared to zero on the initial hub power on, or
after the hub has been reset.

Without this patch, when a USB 3.0 hub gets suspended, it will not send
a remote wakeup on device connect or disconnect.  This would show up to
the user as "dead ports" unless they ran lsusb -v (since newer versions
of lsusb use the sysfs files, rather than sending control transfers).

Change the hub driver's suspend method to enable remote wake up for
disconnect, connect, and overcurrent for all ports on the hub.  Modify
the xHCI driver's roothub code to handle that request, and set the "wake
on" bits in the port status registers accordingly.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

The USB 3.0 bus specification introduces a new type of power management
called function suspend.  The idea is to be able to suspend different
functions (i.e. a scanner or an SD card reader on a USB printer)
independently.  A device can be in U0, but have one or more functions
suspended.  Thus, signaling a function resume with the standard device
remote wake signaling was not possible.

Instead, a device will (without prompt from the host) send a "device
notification" for the function remote wake.  A new Set Feature Function
Remote Wake was developed to turn remote wake up on and off for each
function.

USB 3.0 devices can still go into device suspend (U3), and signal a
remote wakeup to bring the link back into U1.  However, they now use the
function remote wake device notification to allow the host to know which
function woke the device from U3.

The spec is a bit ambiguous about whether a function is allowed to
signal a remote wakeup if the function has been enabled for remote
wakeup, but not placed in function suspend before the device is placed
into U3.

Section 9.2.5.1 says "Suspending a device with more than one function
effectively suspends all the functions within the device."  I interpret
that to mean that putting a device in U3 suspends all functions, and
thus if the host has previously enabled remote wake for those functions,
it should be able to signal a remote wake up on port status changes.
However, hub vendors may have a different interpretation, and it can't
hurt to put the function into suspend before putting the device into U3.

I cannot get an answer out of the USB 3.0 spec architects about this
ambiguity, so I'm erring on the safe side and always suspending the
first function before placing the device in U3.  Note, this code should
be fixed if we ever find any USB 3.0 devices that have more than one
function.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

When the USB 3.0 hub support went in, I disabled selective suspend for
all external USB 3.0 hubs because they used a different mechanism to
enable remote wakeup.  In fact, other USB 3.0 devices that could signal
remote wakeup would have been prevented from going into suspend because
they would have stalled the SetFeature Device Remote Wakeup request.

This patch adds support for the USB 3.0 way of enabling remote wake up
(with a SetFeature Function Suspend request), and enables selective
suspend for all hubs during hub_probe.  It assumes that all USB 3.0 have
only one "function" as defined by the interface association descriptor,
which is true of all the USB 3.0 devices I've seen so far.  FIXME if
that turns out to change later.

After a device signals a remote wakeup, it is supposed to send a Device
Notification packet to the host controller, signaling which function
sent the remote wakeup.  The host can then put any other functions back
into function suspend.  Since we don't have support for function suspend
(and no devices currently support it), we'll just assume the hub
function will resume the device properly when it received the port
status change notification, and simply ignore any device notification
events from the xHCI host controller.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

Hubs have a flag to indicate whether a given port carries removable devices
or not. This is not strictly accurate in that some built-in devices
will be flagged as removable, but followup patches will make use of platform
data to make this more reliable.
Signed-off-by: NMatthew Garrett <mjg@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

module_param(bool) used to counter-intuitively take an int.  In
fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy
trick.

It's time to remove the int/unsigned int option.  For this version
it'll simply give a warning, but it'll break next kernel version.
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

This patch is in succession of previous patch
commit c8421147
        xHCI: Adding #define values used for hub descriptor

Hub descriptors characteristics #defines values are added in
hub_configure() in place of magic numbers as asked by Alan Stern.
And the indentation for switch and case is changed to be same.

Some #defines values are added in ch11.h for defining hub class
protocols and used in hub.c and hcd.c in which magic values were
used for hub class protocols.
Signed-off-by: NAman Deep <amandeep3986@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The BKL is a gonner.
Signed-off-by: NDavidlohr Bueso <dave@gnu.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

I noticed on my Panther Point system that I wasn't getting hotplug events
for my usb3.0 disk on a usb3 port.  I tracked it down to the fact that the
system had the warm reset change bit still set.  This seemed to block future
events from being received, including a hotplug event.

Clearing this bit during initialization allowed the hotplug event to be
received and the disk to be recognized correctly.

This patch should be backported to kernels as old as 2.6.39.
Signed-off-by: NDon Zickus <dzickus@redhat.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org

This patch (as1487) improves the usbcore debugging output for port
suspend and bus suspend, by stating whether or not remote wakeup is
enabled.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

If the device pass the USB2 software LPM and the host supports hardware
LPM, enable hardware LPM for the device to let the host decide when to
put the link into lower power state.

If hardware LPM is enabled for a port and driver wants to put it into
suspend, it must first disable hardware LPM, resume the port into U0,
and then suspend the port.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Check device's LPM capability by examining the bmAttibutes field of the
USB2.0 Extension Descriptor.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This commit gets BOS(Binary Device Object Store) descriptor set for Super
Speed devices and High Speed devices which support BOS descriptor.

BOS descriptor is used to report additional USB device-level capabilities
that are not reported via the Device descriptor. By getting BOS descriptor
set, driver can check device's device-level capability such as LPM
capability.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

When a hot reset (standard USB port reset) fails on a USB 3.0 port, the
host controller transitions to the "Error" state.  It reports the port
link state as "Inactive", sets the link state change flag, and (if the
device disconnects) also reports the disconnect and connect change status.
It's also supposed to transition the link state to "RxDetect", but the NEC
µPD720200 xHCI host does not.

Unfortunately, Harald found that the combination of the NEC µPD720200 and
a LogiLink USB 3.0 to SATA adapter triggered this issue.  The USB core
would reset the device, the port would go into this error state, and the
device would never be enumerated.  This combination works under Windows,
but not under Linux.

When a hot reset fails on a USB 3.0 port, and the link state is reported
as Inactive, fall back to a warm port reset instead.  Harald confirms that
with a warm port reset (along with all the change bits being correctly
cleared), the USB 3.0 device will successfully enumerate.

Harald also had to add two other patches ("xhci: Set change bit when warm
reset change is set." and "usbcore: refine warm reset logic") to make this
setup work.  Since the warm reset refinement patch is not destined for the
stable kernels (it's too big), this patch should not be backported either.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=41752Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: NHarald Brennich <harald.brennich@gmx.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Current waiting time for warm(BH) reset in hub_port_warm_reset() is too short
for xHC host to complete the warm reset and report a BH reset change.

This patch increases the waiting time for warm reset and merges the function
into hub_port_reset(), so it can handle both cold reset and warm reset, and
factor out hub_port_finish_reset() to make the code looks cleaner.

This fixes the issue that driver fails to clear BH reset change and port is
"dead".
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

In a few places in the kernel, the code prints
a human-readable USB device speed (eg. "high speed").
This involves a switch statement sometimes wrapped
around in ({ ... }) block leading to code repetition.

To mitigate this issue, this commit introduces
usb_speed_string() function, which returns
a human-readable name of provided speed.

It also changes a few places switch was used to use
this new function.  This changes a bit the way the
speed is printed in few instances at the same time
standardising it.
Signed-off-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size
instead of le16_to_cpu(desc->wMaxPacketSize).
This patch fix it up

Cc: Armin Fuerst <fuerst@in.tum.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Johannes Erdfelt <johannes@erdfelt.com>
Cc: Vojtech Pavlik <vojtech@suse.cz>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: David Kubicek <dave@awk.cz>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Brad Hards <bhards@bigpond.net.au>
Acked-by: NFelipe Balbi <balbi@ti.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de>
Cc: David Brownell <david-b@pacbell.net>
Cc: David Lopo <dlopo@chipidea.mips.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Michal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Xie Xiaobo <X.Xie@freescale.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Jiang Bo <tanya.jiang@freescale.com>
Cc: Yuan-hsin Chen <yhchen@faraday-tech.com>
Cc: Darius Augulis <augulis.darius@gmail.com>
Cc: Xiaochen Shen <xiaochen.shen@intel.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Ben Dooks <ben@simtec.co.uk>
Cc: Thomas Abraham <thomas.ab@samsung.com>
Cc: Herbert Pötzl <herbert@13thfloor.at>
Cc: Arnaud Patard <arnaud.patard@rtp-net.org>
Cc: Roman Weissgaerber <weissg@vienna.at>
Acked-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Tony Olech <tony.olech@elandigitalsystems.com>
Cc: Florian Floe Echtler <echtler@fs.tum.de>
Cc: Christian Lucht <lucht@codemercs.com>
Cc: Juergen Stuber <starblue@sourceforge.net>
Cc: Georges Toth <g.toth@e-biz.lu>
Cc: Bill Ryder <bryder@sgi.com>
Cc: Kuba Ober <kuba@mareimbrium.org>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

In drivers/usb/core/hub.c::usb_disconnect(), 'udev' will never be
NULL, so remove the test and printing of debug message.
Signed-off-by: NJesper Juhl <jj@chaosbits.net>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

This patch (as1482) adds a macro for testing whether or not a
pm_message value represents an autosuspend or autoresume (i.e., a
runtime PM) event.  Encapsulating this notion seems preferable to
open-coding the test all over the place.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

This patch (as1465) continues implementation of the policy that errors
during suspend or hibernation should not prevent the system from going
to sleep.

In this case, failure to turn on the Suspend feature for a hub port
shouldn't be reported as an error.  There are situations where this
does actually occur (such as when the device plugged into that port
was disconnected in the recent past), and it turns out to be harmless.
There's no reason for it to prevent a system sleep.

Also, don't allow the hub driver to fail a system suspend if the
downstream ports aren't all suspended.  This is also harmless (and
should never happen, given the change mentioned above); printing a
warning message in the kernel log is all we really need to do.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
CC: <stable@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Tanya ran into an issue when trying to switch a UAS device from the BOT
configuration to the UAS configuration via the bConfigurationValue sysfs
file.  Before installing the UAS configuration, set_bConfigurationValue()
calls usb_disable_device().  That function is supposed to remove all host
controller resources associated with that device, but it leaves some state
in the xHCI host controller.

Commit 0791971b
	usb: allow drivers to use allocated bandwidth until unbound
added a call to usb_disable_device() in usb_set_configuration(), before
the xHCI bandwidth functions were invoked.  That commit fixed a bug, but
also introduced a bug that is triggered when a configured device is
switched to a new configuration.

usb_disable_device() goes through all the motions of unbinding the drivers
attached to active interfaces and removing the USB core structures
associated with those interfaces, but it doesn't actually remove the
endpoints from the internal xHCI host controller bandwidth structures.

When usb_disable_device() calls usb_disable_endpoint() with reset_hardware
set to true, the entries in udev->ep_out and udev->ep_in will be set to
NULL.  Usually, when the USB core installs a new configuration,
usb_hcd_alloc_bandwidth() will drop all non-NULL endpoints in udev->ep_out
and udev->ep_in before adding any new endpoints.  However, when the new
UAS configuration was added, all those entries were null, so none of the
old endpoints in the BOT configuration were dropped.

The xHCI driver blindly added the UAS configuration endpoints, and some of
the endpoint addresses overlapped with the old BOT configuration
endpoints.  This caused the xHCI host to reject the Configure Endpoint
command.  Now that the xHCI driver code is cleaned up to reject a
double-add of active endpoints, we need to fix the USB core to properly
drop old endpoints in usb_disable_device().

If the host controller driver needs bandwidth checking support, make
usb_disable_device() call usb_disable_endpoint() with
reset_hardware set to false, drop the endpoints from the xHCI host
controller, and then call usb_disable_endpoint() again with
reset_hardware set to true.

The first call to usb_disable_endpoint() will cancel any pending URBs and
wait on them to be freed in usb_hcd_disable_endpoint(), but will keep the
pointers in udev->ep_out and udev->ep in intact.  Then
usb_hcd_alloc_bandwidth() will use those pointers to know which endpoints
to drop.

The final call to usb_disable_endpoint() will do two things:

1. It will call usb_hcd_disable_endpoint() again, which should be harmless
since the ep->urb_list should be empty after the first call to
usb_disable_endpoint() returns.

2. It will set the entries in udev->ep_out and udev->ep in to NULL, and call
usb_hcd_disable_endpoint().  That call will have no effect, since the xHCI
driver doesn't set the endpoint_disable function pointer.

Note that usb_disable_device() will now need to be called with
hcd->bandwidth_mutex held.

This should be backported to kernels as old as 2.6.32.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: NTanya Brokhman <tlinder@codeaurora.org>
Cc: ablay@codeaurora.org
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@kernel.org

Protocol stall should not be fatal while reading port or hub status as it is
transient state.  Currently hub EP0 STALL during port status read results in
failed device enumeration.  This has been observed with ST-Ericsson (formerly
Philips) USB 2.0 Hub (04cc:1521) after connecting keyboard.
Signed-off-by: NLibor Pechacek <lpechacek@suse.cz>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Some USB3.0 devices go to SS.Inactive state when hot plug to USB3 ports.
Warm reset the port to transition it to U0 state.

This patch fixes the issue that Kingston USB3.0 flash drive can not be
recognized when hot plug to USB3 port.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

In the past, we use USB2.0 request to suspend and resume a USB3.0 device.
Actually, USB3.0 hub does not support Set/Clear PORT_SUSPEND request,
instead, it uses Set PORT_LINK_STATE request. This patch makes USB3.0 device
suspend/resume comply with USB3.0 specification.

This patch fixes the issue that USB3.0 device can not be suspended when
connected to a USB3.0 external hub.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

USB3.0 specification has different wPortStatus and wPortChange definitions
from USB2.0 specification. Since USB3 root hub and USB2 root hub are split
now and USB3 hub only has USB3 protocol ports, we should modify the
portstatus and portchange report of USB3 ports to comply with USB3.0
specification.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

This patch clear PORT_POWER when suspend a USB3.0 device behind a USB3.0
external hub, so the system can suspend and resume.

Note USB3.0 device may not work after system resume and this is a temporary
workaround. The correct fix will be in future patches.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>

A subsequent patch will modify device_set_wakeup_capable() in such
a way that it will call functions which may sleep and therefore it
shouldn't be called under spinlocks.  In preparation to that, modify
usb_set_device_state() to avoid calling device_set_wakeup_capable()
under device_state_lock.
Tested-by: NMinchan Kim <minchan.kim@gmail.com>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>

USB 3.0 devices have a slightly different suspend sequence than USB
2.0/1.1 devices.  There isn't support for USB 3.0 device suspend yet, so
make khubd leave autosuspend disabled for USB 3.0 hubs.  Make sure that
USB 3.0 roothubs still have autosuspend enabled, since that path in the
xHCI driver works fine.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

USB_PORT_STAT_SUPER_SPEED is a made up symbol that the USB core used to
track whether USB ports had a SuperSpeed device attached.  This is a
linux-internal symbol that was used when SuperSpeed and non-SuperSpeed
devices would show up under the same xHCI roothub.  This particular
port status is never returned by external USB 3.0 hubs.  (Instead they
have a USB_PORT_STAT_SPEED_5GBPS that uses a completely different speed
mask.)

Now that the xHCI driver registers two roothubs, USB 3.0 devices will only
show up under USB 3.0 hubs.  Rip out USB_PORT_STAT_SUPER_SPEED and replace
it with calls to hub_is_superspeed().
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

Change the bandwith_mutex in struct usb_hcd to a pointer.  This will allow
the pointer to be shared across usb_hcds for the upcoming work to split
the xHCI driver roothub into a USB 2.0/1.1 and a USB 3.0 bus.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

In USB 3.0, there are two types of resets: a "hot" port reset and a "warm"
port reset.  The hot port reset is always tried first, and involves
sending the reset signaling for a shorter amount of time.  But sometimes
devices don't respond to the hot reset, and a "Bigger Hammer" is needed.

External hubs and roothubs will automatically try a warm reset when the
hot reset fails, and they will set a status change bit to indicate when
there is a "BH reset" change.  Make sure the USB core clears that port
status change bit, or we'll get lots of status change notifications on the
interrupt endpoint of the USB 3.0 hub.

(Side note: you may be confused why the USB 3.0 spec calls the same type
of reset "warm reset" in some places and "BH reset" in other places.  "BH"
reset is supposed to stand for "Big Hammer" reset, but it also stands for
"Brad Hosler".  Brad died shortly after the USB 3.0 bus specification was
started, and they decided to name the reset after him.  The suggestion was
made shortly before the spec was finalized, so the wording is a bit
inconsistent.)
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>

Update the USB core to deal with USB 3.0 hubs.  These hubs have a slightly
different hub descriptor than USB 2.0 hubs, with a fixed (rather than
variable length) size.  Change the USB core's hub descriptor to have a
union for the last fields that differ.  Change the host controller drivers
that access those last fields (DeviceRemovable and PortPowerCtrlMask) to
use the union.

Translate the new version of the hub port status field into the old
version that khubd understands.  (Note: we need to fix it to translate the
roothub's port status once we stop converting it to USB 2.0 hub status
internally.)

Add new code to handle link state change status.  Send out new control
messages that are needed for USB 3.0 hubs, like Set Hub Depth.

This patch is a modified version of the original patch submitted by John
Youn.  It's updated to reflect the removal of the "bitmap" #define, and
change the hub descriptor accesses of a couple new host controller
drivers.
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Cc: Tony Olech <tony.olech@elandigitalsystems.com>
Cc: "Robert P. J. Day" <rpjday@crashcourse.ca>
Cc: Max Vozeler <mvz@vozeler.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: Rodolfo Giometti <giometti@linux.it>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Anton Vorontsov <avorontsov@mvista.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Lothar Wassmann <LW@KARO-electronics.de>
Cc: Olav Kongas <ok@artecdesign.ee>
Cc: Martin Fuzzey <mfuzzey@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <dbrownell@users.sourceforge.net>

On a laptop I see these errors on (most) resumes:
    hub 3-0:1.0: over-current change on port 1
    hub 3-0:1.0: over-current change on port 2

Since over-current conditions can disappear quite quickly it's better to
downgrade that message to debug level, recheck for an over-current
condition a little later and only print and over-current condition error
if that condition (still) exists when it's rechecked.

Add similar logic to hub over-current changes. (That code is untested,
as those changes do not occur on this laptop.)
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>