Peter Chen [Fri, 19 Feb 2016 09:26:15 +0000 (17:26 +0800)]
USB: core: let USB device know device node
Although most of USB devices are hot-plug's, there are still some devices
are hard wired on the board, eg, for HSIC and SSIC interface USB devices.
If these kinds of USB devices are multiple functions, and they can supply
other interfaces like i2c, gpios for other devices, we may need to
describe these at device tree.
In this commit, it uses "reg" in dts as physical port number to match
the phyiscal port number decided by USB core, if they are the same,
then the device node is for the device we are creating for USB core.
Signed-off-by: Peter Chen <peter.chen@freescale.com> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reilly Grant [Sun, 21 Feb 2016 21:38:01 +0000 (18:38 -0300)]
usb: devio: Add ioctl to disallow detaching kernel USB drivers.
The new USBDEVFS_DROP_PRIVILEGES ioctl allows a process to voluntarily
relinquish the ability to issue other ioctls that may interfere with
other processes and drivers that have claimed an interface on the
device.
This commit also includes a simple utility to be able to test the
ioctl, located at Documentation/usb/usbdevfs-drop-permissions.c
Example (with qemu-kvm's input device):
$ lsusb
...
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
$ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
OK: privileges dropped!
Available options:
[0] Exit now
[1] Reset device. Should fail if device is in use
[2] Claim 4 interfaces. Should succeed where not in use
[3] Narrow interface permission mask
Which option shall I run?: 1
ERROR: USBDEVFS_RESET failed! (1 - Operation not permitted)
Which test shall I run next?: 2
ERROR claiming if 0 (1 - Operation not permitted)
ERROR claiming if 1 (1 - Operation not permitted)
ERROR claiming if 2 (1 - Operation not permitted)
ERROR claiming if 3 (1 - Operation not permitted)
Which test shall I run next?: 0
$ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
...
Which option shall I run?: 2
OK: claimed if 0
ERROR claiming if 1 (1 - Operation not permitted)
ERROR claiming if 2 (1 - Operation not permitted)
ERROR claiming if 3 (1 - Operation not permitted)
Which test shall I run next?: 1
OK: USBDEVFS_RESET succeeded
Which test shall I run next?: 0
After unbinding usbhid and restricting the mask:
$ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
...
Which option shall I run?: 3
Insert new mask: 0
OK: privileges dropped!
Which test shall I run next?: 2
ERROR claiming if 0 (1 - Operation not permitted)
ERROR claiming if 1 (1 - Operation not permitted)
ERROR claiming if 2 (1 - Operation not permitted)
ERROR claiming if 3 (1 - Operation not permitted)
Signed-off-by: Reilly Grant <reillyg@chromium.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Merge tag 'usb-for-v4.6' of http://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next
Felipe writes:
usb changes for v4.6 merge window
This is almost all under drivers/usb/dwc2/. Many
changes to the host side implementation of dwc2 have
been done by Douglas Anderson.
We also have USB 3.1 support added to the Gadget
Framework and, because of that work, dwc3 got
support to Synopsys new DWC_usb31 IP core.
Other than these 2 important series, we also have
the usual collection of non-critical fixes,
Documentation updates, and minor changes all over
the place.
Fixes: ea6bd6b ("usb-gadget/f_acm: use per-attribute show and store methods") Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: udc: lpc32xx: remove USB PLL and USB OTG clock management
LPC32xx common clock framework driver correctly manages parent clocks
of USB device clock, so there is no need to manually enable and
disable them from the driver, which now depends only on a single USB
device clock.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: udc: lpc32xx: remove direct access to clock controller registers
Direct access to clock control registers can be safely removed, the
task of clock management is done by platform clock driver based on
common clock framework.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: udc: lpc32xx: switch to clock prepare/unprepare model
The driver requires to prepare/unprepare clocks to work properly on a
platform with enabled common clock framework, otherwise unprepared
clocks are not enabled:
WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:728 clk_core_enable+0x2c/0xf0()
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.3.0-rc2+ #284
Hardware name: LPC32XX SoC (Flattened Device Tree)
Backtrace:
[<>] (dump_backtrace) from [<>] (show_stack+0x18/0x1c)
[<>] (show_stack) from [<>] (dump_stack+0x20/0x28)
[<>] (dump_stack) from [<>] (warn_slowpath_common+0x90/0xb8)
[<>] (warn_slowpath_common) from [<>] (warn_slowpath_null+0x24/0x2c)
[<>] (warn_slowpath_null) from [<>] (clk_core_enable+0x2c/0xf0)
[<>] (clk_core_enable) from [<>] (clk_enable+0x24/0x38)
[<>] (clk_enable) from [<>] (lpc32xx_udc_probe+0x284/0x924)
[<>] (lpc32xx_udc_probe) from [<>] (platform_drv_probe+0x50/0xa0)
[<>] (platform_drv_probe) from [<>] (driver_probe_device+0x18c/0x408)
[<>] (driver_probe_device) from [<>] (__driver_attach+0x70/0x94)
[<>] (__driver_attach) from [<>] (bus_for_each_dev+0x74/0x98)
[<>] (bus_for_each_dev) from [<>] (driver_attach+0x20/0x28)
[<>] (driver_attach) from [<>] (bus_add_driver+0x11c/0x248)
[<>] (bus_add_driver) from [<>] (driver_register+0xa4/0xe8)
[<>] (driver_register) from [<>] (__platform_driver_register+0x50/0x64)
[<>] (__platform_driver_register) from [<>] (__platform_driver_probe+0x54/0x100)
[<>] (__platform_driver_probe) from [<>] (lpc32xx_udc_driver_init+0x1c/0x28)
[<>] (lpc32xx_udc_driver_init) from [<>] (do_one_initcall+0x11c/0x1dc)
[<>] (do_one_initcall) from [<>] (kernel_init_freeable+0x10c/0x1d4)
[<>] (kernel_init_freeable) from [<>] (kernel_init+0x10/0xec)
[<>] (kernel_init) from [<>] (ret_from_fork+0x14/0x24)
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: renesas_usbhs: gadget: fix giveback status code in usbhsg_pipe_disable()
A udc driver should set the giveback status to -ESHUTDOWN in
usb_ep_disable(). Otherwise, a gadget driver (e.g. g_serial) might
request next data wrongly and it is possible to cause kernel panic.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Simon Horman [Wed, 2 Mar 2016 02:17:17 +0000 (11:17 +0900)]
usb: gadget: renesas_usb3: Use ARCH_RENESAS
Make use of ARCH_RENESAS in place of ARCH_SHMOBILE.
This is part of an ongoing process to migrate from ARCH_SHMOBILE to
ARCH_RENESAS the motivation for which being that RENESAS seems to be a more
appropriate name than SHMOBILE for the majority of Renesas ARM based SoCs.
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Tue, 1 Mar 2016 01:53:35 +0000 (17:53 -0800)]
usb: dwc2: Fix issues in dwc2_complete_non_isoc_xfer_ddma()
Fixes a static analysis issue in dwc2_complete_non_isoc_xfer_ddma(). The
qtd was being passed to a function after being freed. It was not being
used in the function so this doesn't fix any bugs. But it fixes up the
warning and makes the code safer by setting qtd to NULL and not using it
at all.
Reported-by: Felipe Balbi <balbi@kernel.org> Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: gadget: bdc_udc: fix race condition in bdc_udc_exit()
bdc_ep_disable() expects to be called with bdc->lock held.
The assumption is met in all the cases except for call from bdc_udc_exit(),
that is called from bdc_remove(). As a result a race can happen or unheld
bdc->lock can be unlocked in bdc_req_complete().
The patch proposes to acquire-release bdc->lock around bdc_ep_disable()
in bdc_udc_exit().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Petr Kulhavy [Wed, 24 Feb 2016 15:27:16 +0000 (16:27 +0100)]
usb: musb: core: added missing const qualifier to musb_hdrc_platform_data::config
The musb_hdrc_platform_data::config was defined as a non-const pointer.
However some drivers (e.g. the ux500) set up this pointer to point to a
static structure, which is potentially dangerous. Since the musb core
uses the pointer in a read-only manner the const qualifier was added to
protect the content of the config.
Signed-off-by: Petr Kulhavy <petr@barix.com> Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Wed, 24 Feb 2016 03:55:00 +0000 (19:55 -0800)]
usb: dwc2: Move host-specific core functions into hcd.c
Move host core initialization and host channel routines into hcd.c. This
allows these functions to only be compiled in host-enabled driver
configurations (DRD or host-only).
Tested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Wed, 24 Feb 2016 03:54:57 +0000 (19:54 -0800)]
usb: dwc2: Move register save and restore functions
Move the register save and restore functions into the host and gadget
specific files.
Tested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Here, free memory is allocated using kmem_cache_zalloc. So, use
kmem_cache_free instead of kfree.
This is done using Coccinelle and semantic patch used
is as follows:
//<smpl>
@@
expression x,E,c;
@@
x =
\(kmem_cache_alloc\|kmem_cache_zalloc\|kmem_cache_alloc_node\)(c,...)
... when != x = E
when != &x
?-kfree(x)
+kmem_cache_free(c,x)
//</smpl>
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:13 +0000 (18:20 -0800)]
usb: dwc2: host: If using uframe scheduler, end splits better
The microframe scheduler figured out exactly how many transfers we need
for a split transaction. Let's use this knowledge to know when to end
things.
Without this I found that certain devices would just keep responding
with tons of NYET resonses on their INT_IN endpoint. These would just
keep going and going and eventually we'd decide to terminate the
transfer (because the whole frame changed), but by that time the
scheduler would decide that we "missed" the start of the next transfer.
I can also imagine that if we blow past the end of our scheduled time we
may mess up other things that were scheduled to happen.
No known test cases are improved by this patch except that the scheduler
code doesn't yell about MISSES constantly anymore.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:12 +0000 (18:20 -0800)]
usb: dwc2: host: Totally redo the microframe scheduler
This totally reimplements the microframe scheduler in dwc2 to attempt to
handle periodic splits properly. The old code didn't even try, so this
was a significant effort since periodic splits are one of the most
complicated things in USB.
I've attempted to keep the old "don't use the microframe" schduler
around for now, but not sure it's needed. It has also only been lightly
tested.
I think it's pretty certain that this scheduler isn't perfect and might
have some bugs, but it seems much better than what was there before.
With this change my stressful USB test (USB webcam + USB audio + some
keyboards) crackles less.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:11 +0000 (18:20 -0800)]
usb: dwc2: host: Properly set even/odd frame
When setting up ISO and INT transfers dwc2 needs to specify whether the
transfer is for an even or an odd frame (or microframe if the controller
is running in high speed mode).
The controller appears to use this as a simple way to figure out if a
transfer should happen right away (in the current microframe) or should
happen at the start of the next microframe. Said another way:
- If you set "odd" and the current frame number is odd it appears that
the controller will try to transfer right away. Same thing if you set
"even" and the current frame number is even.
- If the oddness you set and the oddness of the frame number are
_different_, the transfer will be delayed until the frame number
changes.
As I understand it, the above technique allows you to plan ahead of time
where possible by always working on the next frame. ...but it still
allows you to properly respond immediately to things that happened in
the previous frame.
The old dwc2_hc_set_even_odd_frame() didn't really handle this concept.
It always looked at the frame number and setup the transfer to happen in
the next frame. In some cases that meant that certain transactions
would be transferred in the wrong frame.
We'll try our best to set the even / odd to do the transfer in the
scheduled frame. If that fails then we'll do an ugly "schedule ASAP".
We'll also modify the scheduler code to handle this and not try to
schedule a second transfer for the same frame.
Note that this change relies on the work to redo the microframe
scheduler. It can work atop ("usb: dwc2: host: Manage frame nums better
in scheduler") but it works even better after ("usb: dwc2: host: Totally
redo the microframe scheduler").
With this change my stressful USB test (USB webcam + USB audio +
keyboards) has less audio crackling than before.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
As we start getting more exact about our scheduling it's becoming more
and more important to know exactly how far through the current frame we
are. This lets us make decisions about whether there's still time left
to start a new transaction in the current frame.
We'll add dwc2_hcd_get_future_frame_number() which will tell you what
the frame number will be a certain number of microseconds (us) from
now. We can use this information to help decide if there's enough time
left in the frame for a transaction that will take a certain duration.
This is expected to be used by a future change ("usb: dwc2: host:
Properly set even/odd frame").
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:08 +0000 (18:20 -0800)]
usb: dwc2: host: Manage frame nums better in scheduler
The dwc2 scheduler (contained in hcd_queue.c) was a bit confusing in the
way it initted / kept track of which frames a QH was going to be active
in. Let's clean things up a little bit in preparation for a rewrite of
the microframe scheduler.
Specifically:
* Old code would pick a frame number in dwc2_qh_init() and would try to
pick it "in a slightly future (micro)frame". As far as I can tell the
reason for this was that there was a delay between dwc2_qh_init() and
when we actually wanted to dwc2_hcd_qh_add(). ...but apparently this
attempt to be slightly in the future wasn't enough because
dwc2_hcd_qh_add() then had code to reset things if the frame _wasn't_
in the future. There's no reason not to just pick the frame later.
For non-periodic QH we now pick the frame in dwc2_hcd_qh_add(). For
periodic QH we pick the frame at dwc2_schedule_periodic() time.
* The old "dwc2_qh_init() actually assigned to "hsotg->frame_number".
This doesn't seem like a great idea since that variable is supposed to
be used to keep track of which SOF the interrupt handler has seen.
Let's be clean: anyone who wants the current frame number (instead of
the one as of the last interrupt) should ask for it.
* The old code wasn't terribly consistent about trying to use the frame
that the microframe scheduler assigned to it. In
dwc2_sched_periodic_split() when it was scheduling the first frame it
always "ORed" in 0x7 (!). Since the frame goes on the wire 1 uFrame
after next_active_frame it meant that the SSPLIT would always try for
uFrame 0 and the transaction would happen on the low speed bus during
uFrame 1. This is irregardless of what the microframe scheduler
said.
* The old code assumed it would get called to schedule the next in a
periodic split very quickly. That is if next_active_frame was
0 (transfer on wire in uFrame 1) it assumed it was getting called to
schedule the next uFrame during uFrame 1 too (so it could queue
something up for uFrame 2). It should be possible to actually queue
something up for uFrame 2 while in uFrame 2 (AKA queue up ASAP). To
do this, code needs to look at the previously scheduled frame when
deciding when to next be active, not look at the current frame number.
* If there was no microframe scheduler, the old code would check for
whether we should be active using "qh->next_active_frame ==
frame_number". This seemed like a race waiting to happen. ...plus
there's no way that you wouldn't want to schedule if next_active_frame
was actually less than frame number.
Note that this change doesn't make 100% sense on its own since it's
expecting some sanity in the frame numbers assigned by the microframe
scheduler and (as per the future patch which rewries it) I think that
the current microframe scheduler is quite insane. However, it seems
like splitting this up from the microframe scheduler patch makes things
into smaller chunks and hopefully adds to clarity rather than reduces
it. The two patches could certainly be squashed. Not that in the very
least, I don't see any obvious bad behavior introduced with just this
patch.
I've attempted to keep the config parameter to disable the microframe
scheduler in tact in this change, though I'm not sure it's worth it.
Obviously the code is touched a lot so it's possible I regressed
something when the microframe scheduler is disabled, though I did some
basic testing and it seemed to work OK. I'm still not 100% sure why you
wouldn't want the microframe scheduler (presuming it works), so maybe a
future patch (or a future version of this patch?) could remove that
parameter.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:07 +0000 (18:20 -0800)]
usb: dwc2: host: Add scheduler logging for missed SOFs
We'll use the new "scheduler verbose debugging" macro to log missed
SOFs. This is fast enough (assuming you configure it to use the ftrace
buffer) that we can do it without worrying about the speed hit. The
overhead hit if the scheduler tracing is set to "no_printk" should be
near zero.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:06 +0000 (18:20 -0800)]
usb: dwc2: host: Split code out to make dwc2_do_reserve()
This no-op change splits code out of dwc2_schedule_periodic() into a
dwc2_do_reserve() function. This makes it a little easier to follow the
logic.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:05 +0000 (18:20 -0800)]
usb: dwc2: host: Reorder things in hcd_queue.c
This no-op change just reorders a few functions in hcd_queue.c in order
to prepare for future changes. Motivations here:
The functions dwc2_hcd_qh_free() and dwc2_hcd_qh_create() are exported
functions. They are not called within the file. That means that they
should be near the bottom so that they can easily call static helpers.
The function dwc2_qh_init() is only called by dwc2_hcd_qh_create() and
should move near the bottom with it.
The only reason that the dwc2_unreserve_timer_fn() timer function (and
its subroutine dwc2_do_unreserve()) were so high in the file was that
they needed to be above dwc2_qh_init(). Now that dwc2_qh_init() has
been moved down it can be moved down a bit. A later patch will split
the reserve code out of dwc2_schedule_periodic() and the reserve
function should be near the unreserve function. The reserve function
needs to be below dwc2_find_uframe() since it calls that.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:04 +0000 (18:20 -0800)]
usb: dwc2: host: Rename some fields in struct dwc2_qh
This no-op change just does some renames to simplify a future patch.
1. The "interval" field is renamed to "host_interval" to make it more
obvious that this interval may be 8 times the interval that the
device sees (if we're doing split transactions). A future patch will
also add the "device_interval" field.
2. The "usecs" field is renamed to "host_us" again to make it more
obvious that this is the time for the transaction as seen by the
host. For split transactions the device may see a much longer
transaction time. A future patch will also add "device_us".
3. The "sched_frame" field is renamed to "next_active_frame". The name
"sched_frame" kept confusing me because it felt like something more
permament (the QH's reservation or something). The name
"next_active_frame" makes it more obvious that this field is
constantly changing.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:03 +0000 (18:20 -0800)]
usb: dwc2: host: Use periodic interrupt even with DMA
The old code in dwc2_process_periodic_channels() would only enable the
"periodic empty" interrupt if we weren't using DMA. That wasn't right
since we can still get into cases where we have small FIFOs even on
systems that have DMA (the rk3288 is a prime example).
Let's always enable/disable the "periodic empty" when appropriate. As
part of this:
* Always call dwc2_process_periodic_channels() even if there's nothing
in periodic_sched_assigned (we move the queue empty check so we still
avoid the extra work). That will make extra certain that we will
properly disable the "periodic empty" interrupt even if there's
nothing queued up.
* Move the enable of "periodic empty" due to non-empty
periodic_sched_assigned to be for slave mode (non-DMA mode) only.
Presumably this was the original intention of the check for DMA since
it seems to match the comments above where in slave mode we leave
things on the assigned queue.
Note that even before this change slave mode didn't work for me, so I
can't say for sure that my understanding of slave mode is correct.
However, this shouldn't change anything for slave mode so if slave mode
worked for someone in the past it ought to still work.
With this change, I no longer get constant misses reported by my other
debugging code (and with future patches) when I've got:
* Rockchip rk3288 Chromebook, using port ff540000
-> Pluggable 7-port Hub with Charging (powered)
-> Microsoft Wireless Keyboard 2000 in port 1.
-> Das Keyboard in port 2.
-> Jabra Speaker in port 3
-> Logitech, Inc. Webcam C600 in port 4
-> Microsoft Sidewinder X6 Keyboard in port 5
...and I'm playing music on the USB speaker and capturing video from the
webcam.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:02 +0000 (18:20 -0800)]
usb: dwc2: host: There's not really a TT for the root hub
I find that when I plug a full speed (NOT high speed) hub into a dwc2
port and then I plug a bunch of devices into that full speed hub that
dwc2 goes bat guano crazy. Specifically, it just spews errors like this
in the console:
usb usb1: clear tt 1 (9043) error -22
The specific test case I used looks like this:
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
|__ Port 1: Dev 17, If 0, Class=Hub, Driver=hub/4p, 12M
|__ Port 2: Dev 19, If 0, ..., Driver=usbhid, 1.5M
|__ Port 4: Dev 20, If 0, ..., Driver=usbhid, 12M
|__ Port 4: Dev 20, If 1, ..., Driver=usbhid, 12M
|__ Port 4: Dev 20, If 2, ..., Driver=usbhid, 12M
Showing VID/PID:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 017: ID 03eb:3301 Atmel Corp. at43301 4-Port Hub
Bus 001 Device 020: ID 045e:0745 Microsoft Corp. Nano Transceiver ...
Bus 001 Device 019: ID 046d:c404 Logitech, Inc. TrackMan Wheel
I spent a bunch of time trying to figure out why there are errors to
begin with. I believe that the issue may be a hardware issue where the
transceiver sometimes accidentally sends a PREAMBLE packet if you send a
packet to a full speed device right after one to a low speed device.
Luckily the USB driver retries and the second time things work OK.
In any case, things kinda seem work despite the errors, except for the
"clear tt" spew mucking up my console. Chalk it up for a win for
retries and robust protocols.
So getting back to the "clear tt" problem, it appears that we get those
because there's not actually a TT here to clear. It's my understanding
that when dwc2 operates in low speed or full speed mode that there's no
real TT out there. That makes all these attempts to "clear the TT"
somewhat meaningless and also causes the spew in the log.
Let's just skip all the useless TT clears. Eventually we should root
cause the errors, but even if we do this is still a proper fix and is
likely to avoid the "clear tt" error in the future.
Note that hooking up a Full Speed USB Audio Device (Jabra 510) to this
same hub with the keyboard / trackball shows that even audio works over
this janky connection. As a point to note, this particular change (skip
bogus TT clears) compared to just commenting out the dev_err() in
hub_tt_work() actually produces better audio.
Note: don't ask me where I got a full speed USB hub or whether the
massive amount of dust that accumulated on it while it was in my junk
box affected its funtionality. Just smile and nod.
Acked-by: John Youn <johnyoun@synopsys.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:01 +0000 (18:20 -0800)]
usb: dwc2: host: Properly set the HFIR
According to the most up to date version of the dwc2 databook, the FRINT
field of the HFIR register should be programmed to:
* 125 us * (PHY clock freq for HS) - 1
* 1000 us * (PHY clock freq for FS/LS) - 1
This is opposed to older versions of the doc that claimed it should be:
* 125 us * (PHY clock freq for HS)
* 1000 us * (PHY clock freq for FS/LS)
In case you didn't spot it, the difference is the "- 1".
Let's add the "- 1" to match the newest user manual. It's presumed that
the "- 1" should have always been there and that this was always a
documentation error. If some hardware needs the "- 1" and other
hardware doesn't, we'll have to add a configuration parameter for it in
the future.
I checked things before and after this patch on rk3288 using a Total
Phase Beagle 5000 analyzer.
Before this patch, a low speed mouse shows constant Frame Timing Jitter
errors. After this patch errors have gone away.
Before this patch SOF packets move forward about 1 us per 4 ms. After
this patch the SOF packets move backward about 1 us per 255 ms. Some
specific SOF timestamps from the analyzer are below.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:20:00 +0000 (18:20 -0800)]
usb: dwc2: host: Giveback URB in tasklet context
In commit 94dfd7edfd5c ("USB: HCD: support giveback of URB in tasklet
context") support was added to give back the URB in tasklet context.
Let's take advantage of this in dwc2.
This speeds up the dwc2 interrupt handler considerably.
Note that this requires the change ("usb: dwc2: host: Add a delay before
releasing periodic bandwidth") to come first.
Note that, as per Alan Stern in
<https://patchwork.kernel.org/patch/7555771/>, we also need to make sure
that the extra delay before the device drivers submit more data doesn't
break the scheduler. At the moment the scheduler is pretty broken (see
future patches) so it's hard to be 100% certain, but I have yet to see
any new breakage introduced by this delay. ...and speeding up interrupt
processing for dwc2 is a huge deal because it means we've got a better
chance of not missing SOF interrupts. That means we've got an overall
win here.
Note that when playing USB audio and using a USB webcam and having
several USB keyboards plugged in, the crackling on the USB audio device
is noticably reduced with this patch.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:59 +0000 (18:19 -0800)]
usb: dwc2: host: Add a delay before releasing periodic bandwidth
We'd like to be able to use HCD_BH in order to speed up the dwc2 host
interrupt handler quite a bit. However, according to the kernel doc for
usb_submit_urb() (specifically the part about "Reserved Bandwidth
Transfers"), we need to keep a reservation active as long as a device
driver keeps submitting. That was easy to do when we gave back the URB
in the interrupt context: we just looked at when our queue was empty and
released the reserved bandwidth then. ...but now we need a little more
complexity.
We'll follow EHCI's lead in commit 9118f9eb4f1e ("USB: EHCI: improve
interrupt qh unlink") and add a 5ms delay. Since we don't have a whole
timer infrastructure in dwc2, we'll just add a timer per QH. The
overhead for this is very small.
Note that the dwc2 scheduler is pretty broken (see future patches to fix
it). This patch attempts to replicate all old behavior and just add the
proper delay.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:58 +0000 (18:19 -0800)]
usb: dwc2: host: Add scheduler tracing
In preparation for future changes to the scheduler let's add some
tracing that makes it easy for us to see what's happening. By default
this tracing will be off.
By changing "core.h" you can easily trace to ftrace, the console, or
nowhere.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:57 +0000 (18:19 -0800)]
usb: dwc2: host: fix split transfer schedule sequence
We're supposed to keep outstanding splits in order. Keep track of a
list of the order of splits and process channel interrupts in that
order.
Without this change and the following setup:
* Rockchip rk3288 Chromebook, using port ff540000
-> Pluggable 7-port Hub with Charging (powered)
-> Microsoft Wireless Keyboard 2000 in port 1.
-> Das Keyboard in port 2.
...I find that I get dropped keys on the Microsoft keyboard (I'm sure
there are other combinations that fail, but this documents my test).
Specifically I've been typing "hahahahahahaha" on the keyboard and often
see keys dropped or repeated.
After this change the above setup works properly. This patch is based
on a previous patch proposed by Yunzhi Li ("usb: dwc2: hcd: fix periodic
transfer schedule sequence")
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Yunzhi Li <lyz@rock-chips.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:56 +0000 (18:19 -0800)]
usb: dwc2: host: Always add to the tail of queues
The queues the the dwc2 host controller used are truly queues. That
means FIFO or first in first out.
Unfortunately though the code was iterating through these queues
starting from the head, some places in the code was adding things to the
queue by adding at the head instead of the tail. That means last in
first out. Doh.
Go through and just always add to the tail.
Doing this makes things much happier when I've got:
* 7-port USB 2.0 Single-TT hub
* - Microsoft 2.4 GHz Transceiver v7.0 dongle
* - Jabra speakerphone playing music
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:55 +0000 (18:19 -0800)]
usb: dwc2: host: Avoid use of chan->qh after qh freed
When poking around with USB devices with slub_debug enabled, I found
another obvious use after free. Turns out that in dwc2_hc_n_intr() I
was in a state when the contents of chan->qh was filled with 0x6b,
indicating that chan->qh was freed but chan still had a reference to
it.
Let's make sure that whenever we free qh we also make sure we remove a
reference from its channel.
The bug fixed here doesn't appear to be new--I believe I just got lucky
and happened to see it while stress testing.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:54 +0000 (18:19 -0800)]
usb: dwc2: host: Set host_rx_fifo_size to 525 for rk3066
As documented in dwc2_calculate_dynamic_fifo(), host_rx_fifo_size should
really be:
2 * ((Largest Packet size / 4) + 1 + 1) + n
with n = number of host channel.
We have 9 host channels, so
2 * ((1024/4) + 2) + 9 = 516 + 9 = 525
We've got 960 / 972 total_fifo_size on rk3288 (and presumably on
rk3066) and 525 + 128 + 256 = 909 so we're still under on both ports
even when we increment by 5.
In the future, it would be nice if dwc2_calculate_dynamic_fifo() could
handle the "too small" FIFO case and come up with something more
dynamically. When we do that we can figure out how to allocate the
extra 48 / 60 bytes of FIFO that we're currently wasting.
NOTE: no known bugs are fixed by this patch, but it seems like a simple
fix and ought to fix someone.
Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:53 +0000 (18:19 -0800)]
usb: dwc2: host: Get aligned DMA in a more supported way
All other host controllers who want aligned buffers for DMA do it a
certain way. Let's do that too instead of working behind the USB core's
back. This makes our interrupt handler not take forever and also rips
out a lot of code, simplifying things a bunch.
This also has the side effect of removing the 65535 max transfer size
limit.
NOTE: The actual code to allocate the aligned buffers is ripped almost
completely from the tegra EHCI driver. At some point in the future we
may want to add this functionality to the USB core to share more code
everywhere.
Signed-off-by: Douglas Anderson <dianders@chromium.org> Acked-by: John Youn <johnyoun@synopsys.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: John Youn <johnyoun@synopsys.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Douglas Anderson [Fri, 29 Jan 2016 02:19:52 +0000 (18:19 -0800)]
usb: dwc2: rockchip: Make the max_transfer_size automatic
Previously we needed to set the max_transfer_size to explicitly be 65535
because the old driver would detect that our hardware could support much
bigger transfers and then would try to do them. This wouldn't work
since the DMA alignment code couldn't support it.
Later in commit e8f8c14d9da7 ("usb: dwc2: clip max_transfer_size to
65535") upstream added support for clipping this automatically. Since
that commit it has been OK to just use "-1" (default), but nobody
bothered to change it.
Let's change it to default now for two reasons:
- It's nice to use autodetected params.
- If we can remove the 65535 limit, we can transfer more!
Signed-off-by: Douglas Anderson <dianders@chromium.org> Acked-by: John Youn <johnyoun@synopsys.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Emilio López [Mon, 22 Feb 2016 01:26:36 +0000 (22:26 -0300)]
usb: musb: sunxi: support module autoloading
MODULE_DEVICE_TABLE() is missing, so the module isn't auto-loading on
sunxi systems using the OTG controller. This commit adds the missing
line so it loads automatically when building it as a module and running
on a system with an USB OTG port.
Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:49 +0000 (10:04 +0800)]
usb: chipidea: otg: add A idle to B disconnect timer
B-device detects that bus is idle for more than TB_AIDL_BDIS min and
begins HNP by turning off pullup on DP, this allows the bus to discharge
to the SE0 state. This timer was missed and failed with PET test:
6.8.5 B-UUT HNP of USB OTG and EH automated compliance plan v1.2,
this patch is to fix this timing issue.
Acked-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:48 +0000 (10:04 +0800)]
usb: otg-fsm: add B_AIDL_BDIS timer
Add A-idle to B-disconnect timer, B-device detects that bus is idle
for more than TB_AIDL_BDIS min and begins HNP by turning off pullup
on D+. This allows the bus to discharge to the SE0 state.
Acked-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:44 +0000 (10:04 +0800)]
usb: gadget: composite: handle otg status selector request from OTG host
If gadget with HNP polling support receives GetStatus request of otg
status selector, it feedback to host with host request flag to indicate
if it wants to take host role.
Acked-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:42 +0000 (10:04 +0800)]
usb: common: otg-fsm: add HNP polling support
Adds HNP polling timer when transits to host state, the OTG status
request will be sent to peripheral after timeout, if host request flag
is set, it will switch to peripheral state, otherwise it will repeat HNP
polling every 1.5s and maintain the current session.
Acked-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:41 +0000 (10:04 +0800)]
usb: add OTG status selector definition for HNP polling
A host is required to use the GetStatus command, with wIndex set to the
OTG status selector(F000H) to request the Host request flag from the
peripheral.
Acked-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Li Jun [Fri, 19 Feb 2016 02:04:40 +0000 (10:04 +0800)]
usb: gadget: add hnp_polling_support and host_request_flag in usb_gadget
Add 2 flags for USB OTG HNP polling, hnp_polling_support is to indicate
if the gadget can support HNP polling, host_request_flag is used for
gadget to store host request information from application, which can be
used to respond to HNP polling from host.
Acked-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Marek Szyprowski [Thu, 18 Feb 2016 10:34:43 +0000 (11:34 +0100)]
usb: gadget: provide interface for legacy gadgets to get UDC name
Since commit 855ed04a3758b205e84b269f92d26ab36ed8e2f7 ("usb: gadget:
udc-core: independent registration of gadgets and gadget drivers") gadget
drivers can not assume that UDC drivers are already available on their
initialization. This broke the HACK, which was used in gadgetfs driver,
to get UDC controller name. This patch removes this hack and replaces it
by additional function in the UDC core (which is usefully only for legacy
drivers, please don't use it in the new code).
Reported-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: gadget: f_midi: stash substream in gmidi_in_port structure
For every in_substream, there must be a corresponding gmidi_in_port
structure so it is perfectly viable and some might argue sensible to
stash pointer to the input substream in the gmidi_in_port structure.
This has an added benefit that if in_ports < MAX_PORTS, the whole
f_midi structure takes up less space because only in_ports number of
pointers for in_substream are allocated instead of MAX_PORTS lots of
them.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Dan Carpenter [Tue, 5 Jan 2016 10:28:09 +0000 (13:28 +0300)]
usb: gadget: f_midi: missing unlock on error path
We added a new error path to this function and we forgot to drop the
lock.
Fixes: e1e3d7ec5da3 ('usb: gadget: f_midi: pre-allocate IN requests') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[mina86@mina86.com: rebased on top of refactoring commit] Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: gadget: f_midi: use flexible array member for gmidi_in_port elements
Reduce number of allocations, simplify memory management and reduce
memory usage by stacking the gmidi_in_port elements at the end of the
f_midi structure using a flexible array.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
In general case, all of midi->in_port pointers may be non-NULL which
implies that the ‘if (\!port)’ condition will never execute thus never
zeroing midi->in_last_port. Fix by rewriting the loop such that the
field is set to zero if \!port or end of loop has been reached.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: gadget: f_midi: move some of f_midi_transmit to separate func
Move some of the f_midi_transmit to a separate f_midi_do_transmit
function so the massive indention levels are not so jarring. This
introduces no changes in behaviour.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: gadget: f_midi: remove useless midi reference from port struct
remove a field which is unnecessary. No functional changes.
Signed-off-by: Felipe F. Tonello <eu@felipetonello.com> Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Du, Changbin [Tue, 29 Dec 2015 06:36:58 +0000 (14:36 +0800)]
usb: f_fs: avoid race condition with ffs_epfile_io_complete
ffs_epfile_io and ffs_epfile_io_complete runs in different context, but
there is no synchronization between them.
consider the following scenario:
1) ffs_epfile_io interrupted by sigal while
wait_for_completion_interruptible
2) then ffs_epfile_io set ret to -EINTR
3) just before or during usb_ep_dequeue, the request completed
4) ffs_epfile_io return with -EINTR
In this case, ffs_epfile_io tell caller no transfer success but actually
it may has been done. This break the caller's pipe.
Below script can help test it (adbd is the process which lies on f_fs).
while true
do
pkill -19 adbd #SIGSTOP
pkill -18 adbd #SIGCONT
sleep 0.1
done
To avoid this, just dequeue the request first. After usb_ep_dequeue, the
request must be done or canceled.
With this change, we can ensure no race condition in f_fs driver. But
actually I found some of the udc driver has analogical issue in its
dequeue implementation. For example,
1) the dequeue function hold the controller's lock.
2) before driver request controller to stop transfer, a request
completed.
3) the controller trigger a interrupt, but its irq handler need wait
dequeue function to release the lock.
4) dequeue function give back the request with negative status, and
release lock.
5) irq handler get lock but the request has already been given back.
So, the dequeue implementation should take care of this case. IMO, it
can be done as below steps to dequeue a already started request,
1) request controller to stop transfer on the given ep. HW know the
actual transfer status.
2) after hw stop transfer, driver scan if there are any completed one.
3) if found, process it with real status. if no, the request can
canceled.
Signed-off-by: "Du, Changbin" <changbin.du@intel.com>
[mina86@mina86.com: rebased on top of refactoring commits] Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Eliminate one of the return paths by using a ‘goto error_mutex’ and
rearrange some if-bodies which results in reduction of the indention level
and thus hopefully makes the function easier to read and reason about.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
In ffs_epfile_io error label points to a return path which includes
a kfree(data) call. However, at the beginning of the function data is
always NULL so some of the early ‘goto error’ can safely be replaced
with a trivial return statement.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: f_fs: fix ffs_epfile_io returning success on req alloc failure
In the AIO path, if allocating of a request failse, the function simply
goes to the error_lock path whose end result is returning value of ret.
However, at this point ret’s value is zero (assigned as return value from
ffs_mutex_lock).
Fix by adding ‘ret = -ENOMEM’ statement.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: f_fs: fix memory leak when ep changes during transfer
In the ffs_epfile_io function, data buffer is allocated for non-halt
requests. Later, after grabing a mutex, the function checks that
epfile->ep is still ep and if it’s not, it set ret to -ESHUTDOWN and
follow a path including spin_unlock_irq (just after ‘ret = -ESHUTDOWN’),
mutex_unlock (after if-else-if-else chain) and returns ret. Noticeably,
this does not include freeing of the data buffer.
Fix by introducing a goto which moves control flow to the the end of the
function where spin_unlock_irq, mutex_unlock and kfree are all called.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Bjorn Helgaas [Tue, 2 Feb 2016 20:02:51 +0000 (14:02 -0600)]
usb: phy: phy-am335x: remove include of regulator/consumer.h
phy-am335x.c doesn't use any interfaces from linux/regulator/consumer.h, so
stop including it.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
When I wrote the cleanup patch series, it was not clear how
exactly big-endian mode works on ixp4xx, and whether the driver
was doing this correctly. After discussing with Krzysztof Hałasa,
this has been clarified, so I can update the comment let pxa25x
big-endian (which we don't support) work the same way as ixp4xx.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:23:15 +0000 (17:23 +0100)]
usb: musb/ux500: remove duplicate check for dma_is_compatible
When dma_addr_t is 64-bit, we get a warning about an invalid cast
in the call to ux500_dma_is_compatible() from ux500_dma_channel_program():
drivers/usb/musb/ux500_dma.c: In function 'ux500_dma_channel_program':
drivers/usb/musb/ux500_dma.c:210:51: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
if (!ux500_dma_is_compatible(channel, packet_sz, (void *)dma_addr, len))
The problem is that ux500_dma_is_compatible() is called from the
main musb driver on the virtual address, but here we pass in a
DMA address, so the types are fundamentally different but it works
because the function only checks the alignment of the buffer and
that is the same.
We could work around this by adding another cast, but I have checked
that the buffer we get passed here is already checked before it
gets mapped, so the second check seems completely unnecessary
and removing it must be the cleanest solution.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:23:14 +0000 (17:23 +0100)]
usb: musb: use %pad format string from dma_addr_t
The musb driver prints DMA addresses in a few places, using the
0x%x format string. This is wrong on 64-bit architectures (which
need %lx) and 32-bit ARM with CONFIG_LPAE set (which needs
%llx), otherwise we print the wrong data, as gcc warns:
musb/musbhsdma.c: In function 'configure_channel':
musb/musbhsdma.c:120:53: error: format '%x' expects argument of type 'unsigned int', but argument 6 has type 'dma_addr_t {aka long long unsigned int}' [-Werror=format=]
dev_dbg(musb->controller, "%p, pkt_sz %d, addr 0x%x, len %d, mode %d\n",
musb/musbhsdma.c: In function 'dma_channel_program':
musb/musbhsdma.c:155:53: error: format '%x' expects argument of type 'unsigned int', but argument 7 has type 'dma_addr_t {aka long long unsigned int}' [-Werror=format=]
dev_dbg(musb->controller, "ep%d-%s pkt_sz %d, dma_addr 0x%x length %d, mode %d\n",
musb/tusb6010_omap.c: In function 'tusb_omap_dma_program':
musb/tusb6010_omap.c:313:53: error: format '%x' expects argument of type 'unsigned int', but argument 7 has type 'dma_addr_t {aka long long unsigned int}' [-Werror=format=]
dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n",
This uses the %pad format string, which prints a dma_addr_t that
gets passed by reference, which works for all combinations.
Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:20:54 +0000 (17:20 +0100)]
usb: fsl: drop USB_FSL_MPH_DR_OF Kconfig symbol
The USB_FSL_MPH_DR_OF symbol is used to ensure the code that interprets
the DR device node is built whenever one of the two drivers (EHCI or
UDC) for the platform is enabled. However, if CONFIG_USB is disabled
and we only support gadget mode, this causes a Kconfig warning:
warning: (USB_FSL_USB2) selects USB_FSL_MPH_DR_OF which has unmet direct dependencies (USB_SUPPORT && USB)
We can avoid this warning by simply no longer using the symbol,
and making sure we enter the drivers/usb/host/ directory when
the UDC driver is enabled that needs the file, and then we use
Makefile syntax to ensure the file is built-in if needed.
There is currently a dependency on CONFIG_OF, but this is redundant,
as we already know that this is set unconditionally for the platforms
that use this driver.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:17:04 +0000 (17:17 +0100)]
usb: gadget: pxa25x_udc: use readl/writel for mmio
This converts the pxa25x udc driver to use readl/writel as normal
driver should do, rather than dereferencing __iomem pointers
themselves.
Based on the earlier preparation work, we can now also pass
the register start in the device pointer so we no longer need
the global variable.
The unclear part here is for IXP4xx, which supports both big-endian
and little-endian configurations. So far, the driver has done
no byteswap in either case. I suspect that is wrong and it would
actually need to swap in one or the other case, but I don't know
which. It's also possible that there is some magic setting in
the chip that makes the endianess of the MMIO register match the
CPU, and in that case, the code actually does the right thing
for all configurations, both before and after this patch.
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:17:03 +0000 (17:17 +0100)]
usb: gadget: pxa25x_udc cleanup
This removes the dependency on the mach/hardware.h header file
from the pxa25x_udc driver after the register definitions were
already unified in the previous patch.
Following the model of pxa27x_udc (and basically all other drivers
in the kernel), we define the register numbers as offsets from
the register base address and use accessor functions to read/write
them.
For the moment, this still leaves the direct pointer dereference
in place, instead of using readl/writel, so this patch should
not be changing the behavior of the driver, other than using
ioremap() on the platform resource to replace the hardcoded
virtual address pointers.
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Arnd Bergmann [Thu, 28 Jan 2016 16:17:02 +0000 (17:17 +0100)]
usb: gadget: pxa25x_udc: move register definitions from arch
ixp4xx and pxa25x both use this driver and provide a slightly
different set of register definitions for it. Aside from that,
the definition in the ixp4xx-regs.h header conflicts with the
on in the pxa27x device driver when compile-testing that:
In file included from ../drivers/usb/gadget/udc/pxa27x_udc.c:37:0:
../drivers/usb/gadget/udc/pxa27x_udc.h:26:0: warning: "UDCCR" redefined
#define UDCCR 0x0000 /* UDC Control Register */
^
In file included from ../arch/arm/mach-ixp4xx/include/mach/hardware.h:27:0,
from ../arch/arm/mach-ixp4xx/include/mach/io.h:18,
from ../arch/arm/include/asm/io.h:194,
from ../include/linux/io.h:25,
from ../include/linux/irq.h:24,
from ../drivers/usb/gadget/udc/pxa27x_udc.c:23:
../arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h:415:0: note: this is the location of the previous definition
#define UDCCR IXP4XX_USB_REG(IXP4XX_USB_BASE_VIRT+0x0000)
This addresses both issues by moving all the definitions into the
pxa25x_udc driver itself. It turns out the only difference between
them was 'UDCCS_IO_ROF', and that could well be a mistake when it
was incorrectly copied from pxa25x to ixp4xx.
Acked-by: Krzysztof Halasa <khalasa@piap.pl> Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: renesas_usbhs: Don't check CSSTS bit if peripheral mode
Since Some SoCs (e.g. R-Car Gen2) don't have the CSSTS bit in the
pipectrl registers ({DCP,PIPEn}CTR) because such SoCs have peripheral
mode only. So, this driver should not check the CSSTS bit if peripheral
mode is running.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
Since the usb2 phy driver for gen3 (phy-rcar-gen3-usb2) cannot access
LPSTS and UGCTRL2 registers in the HSUSB module, this driver have to
initialize the registers. So, this patch adds such handling code into
rcar3.c.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:08:59 +0000 (17:08 -0800)]
usb: dwc3: Update maximum_speed for SuperSpeedPlus
If the maximum_speed is not set, set it to a known value, either
SuperSpeed or SuperSpeedPlus based on the type of controller we are
using. If we are on DWC_usb31 controller, check the PHY interface to see
if it is capable of SuperSpeedPlus.
Also this check is moved after dwc3_core_init() so that we can check
dwc->revision.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:07:03 +0000 (17:07 -0800)]
usb: gadget: composite: Add function to get descriptors
There are a couple places in the code that get the function descriptors
based on the speed. Move this lookup into a function call and add
support to handle the SuperSpeedPlus descriptors as well.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:06:35 +0000 (17:06 -0800)]
usb: gadget: Update config for SuperSpeedPlus
When a function is added to a configuration with usb_add_function(), the
configuration speed flags are updated. These flags indicate for which
speeds the configuration is valid for.
This patch adds a flag in the configuration for SuperSpeedPlus and
also updates this based on the existence of ssp_descriptors.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:06:21 +0000 (17:06 -0800)]
usb: gadget: Update function for SuperSpeedPlus
Add a ssp_descriptors member to struct usb_function and handle the
initialization and cleanup of it. This holds the SuperSpeedPlus
descriptors for a function that supports SuperSpeedPlus. This is added
by usb_assign_descriptors().
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:06:07 +0000 (17:06 -0800)]
usb: gadget: Update usb_assign_descriptors for SuperSpeedPlus
Add the 'ssp_descriptors' parameter to the usb_assign_descriptors()
function. This allows a function driver to add descriptors for
SuperSpeedPlus speeds if it supports it.
Also update all uses of this function in the gadget subsystem so that
they pass NULL for the ssp_descriptors parameters.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:05:40 +0000 (17:05 -0800)]
usb: gadget: composite: Return bcdUSB 0x0310
The USB 3.1 specification replaces the USB 3.0 specification and all new
devices that are running at SuperSpeed or higher speeds must report a
bcdUSB of 0x0310.
Refer to USB 3.1 Specification, Revision 1.0, Section 9.6.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
John Youn [Sat, 6 Feb 2016 01:05:12 +0000 (17:05 -0800)]
usb: ch9: Add size macro for SSP dev cap descriptor
The SuperspeedPlus Device Capability Descriptor has a variable size
depending on the number of sublink speed attributes.
This patch adds a macro to calculate that size. The macro takes one
argument, the Sublink Speed Attribute Count (SSAC) as reported by the
descriptor in bmAttributes[4:0].
See USB 3.1 9.6.2.5, Table 9-19.
Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
usb: ohci: nxp: remove USB PLL and USB OTG clock management
LPC32xx common clock framework driver correctly manages parent clocks
of USB OHCI clock, so there is no need to manually enable and
disable them from the driver, which now depends only on a single USB
host clock.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: ohci: nxp: remove direct access to clock controller registers
Direct access to clock control registers can be safely removed, the
task of clock management is done by platform clock driver based on
common clock framework.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Arnd Bergmann [Wed, 2 Mar 2016 15:24:08 +0000 (16:24 +0100)]
phy: twl4030: use __maybe_unused to hide pm functions
The twl4030 USB PHY driver uses UNIVERSAL_DEV_PM_OPS to access
its suspend/resume functions, which causes a warning about
unused symbols when CONFIG_PM is disabled:
drivers/phy/phy-twl4030-usb.c:394:12: error: 'twl4030_usb_runtime_suspend' defined but not used [-Werror=unused-function]
drivers/phy/phy-twl4030-usb.c:408:12: error: 'twl4030_usb_runtime_resume' defined but not used [-Werror=unused-function]
This adds __maybe_unused annotations to let the compiler know
it can silently drop the function definition.
Arnd Bergmann [Wed, 2 Mar 2016 15:24:07 +0000 (16:24 +0100)]
phy: dm816x: use __maybe_unused to hide pm functions
The dm816x USB PHY driver uses UNIVERSAL_DEV_PM_OPS to access
its suspend/resume functions, which causes a warning about
unused symbols when CONFIG_PM is disabled:
drivers/phy/phy-dm816x-usb.c:121:12: error: 'dm816x_usb_phy_runtime_suspend' defined but not used [-Werror=unused-function]
drivers/phy/phy-dm816x-usb.c:139:12: error: 'dm816x_usb_phy_runtime_resume' defined but not used [-Werror=unused-function]
This adds __maybe_unused annotations to let the compiler know
it can silently drop the function definition.
Arnd Bergmann [Wed, 2 Mar 2016 15:24:06 +0000 (16:24 +0100)]
usb: ehci-atmel: use __maybe_unused to hide pm functions
The ehci-atmel driver uses #ifdef to check for CONFIG_PM, but then
uses SIMPLE_DEV_PM_OPS, which leaves the references out when
CONFIG_PM_SLEEP is not defined, so we get a warning with
PM=y && PM_SLEEP=n:
drivers/usb/host/ehci-atmel.c:189:12: error: 'ehci_atmel_drv_suspend' defined but not used [-Werror=unused-function]
drivers/usb/host/ehci-atmel.c:203:12: error: 'ehci_atmel_drv_resume' defined but not used [-Werror=unused-function]
This removes the incorrect #ifdef and instead uses a __maybe_unused
annotation to let the compiler know it can silently drop
the function definition.
Arnd Bergmann [Wed, 2 Mar 2016 15:24:05 +0000 (16:24 +0100)]
usb: ohci-at91: use __maybe_unused to hide pm functions
The ohci-at91 driver uses #ifdef to check for CONFIG_PM, but then
uses SIMPLE_DEV_PM_OPS, which leaves the references out when
CONFIG_PM_SLEEP is not defined, so we get a warning with
PM=y && PM_SLEEP=n:
drivers/usb/host/ohci-at91.c:587:1: error: 'ohci_hcd_at91_drv_suspend' defined but not used [-Werror=unused-function]
drivers/usb/host/ohci-at91.c:631:12: error: 'ohci_hcd_at91_drv_resume' defined but not used [-Werror=unused-function]
This removes the incorrect #ifdef and instead uses a __maybe_unused
annotation to let the compiler know it can silently drop
the function definition.
Arnd Bergmann [Wed, 2 Mar 2016 15:24:04 +0000 (16:24 +0100)]
usb: xhci-mtk: use __maybe_unused to hide pm functions
The mediatek XHCI glue driver uses SET_SYSTEM_SLEEP_PM_OPS() to
conditionally set the correct suspend/resume options, and
also puts both the dev_pm_ops and the functions inside of
an #ifdef testing for CONFIG_PM_SLEEP, but those functions
then call other code that becomes unused:
drivers/usb/host/xhci-mtk.c:135:12: error: 'xhci_mtk_host_disable' defined but not used [-Werror=unused-function]
drivers/usb/host/xhci-mtk.c:313:13: error: 'usb_wakeup_enable' defined but not used [-Werror=unused-function]
drivers/usb/host/xhci-mtk.c:321:13: error: 'usb_wakeup_disable' defined but not used [-Werror=unused-function]
This replaces the #ifdef with __maybe_unused annotations so the
compiler knows it can silently drop them instead of warning.
For the DEV_PM_OPS definition, we can use an IS_ENABLED() check
to avoid defining the structure when CONFIG_PM is not set without
the #ifdef.
Arnd Bergmann [Wed, 2 Mar 2016 15:24:03 +0000 (16:24 +0100)]
usb: host: unhide suspend/resume declarations
There is no need to hide function declarations, and making
these visible to the SoC specific host drivers lets us
use __maybe_unused and IS_ENABLED() checks to control
their use, rather than having to use #ifdef to hide all
callers.
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