Commit Graph

537 Commits

Author SHA1 Message Date
Greg Kroah-Hartman
c00552ebaf Merge 3.18-rc7 into usb-next
We need the xhci fixes here and this resolves a merge issue with
drivers/usb/dwc3/ep0.c

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-11-30 19:21:03 -08:00
Greg Kroah-Hartman
842f57baab Improvements in phy-core specifically on PHY core finds the PHY in the case
of non-dt boot. Adds three new PHY drivers using the PHY framework and some
 miscellaneous fixes and cleanups.
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Merge tag 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux-phy into usb-testing

Kishon writes:

Improvements in phy-core specifically on PHY core finds the PHY in the case
of non-dt boot. Adds three new PHY drivers using the PHY framework and some
miscellaneous fixes and cleanups.
2014-11-27 08:25:20 -08:00
Julia Lawall
6cd6159d4b usb: dwc3: return error code from the most recent call
Copy-paste error from the previous block of error handling code.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e,e1;
@@

if (IS_ERR(e)) {
  ...
(
  ret = PTR_ERR(e);
|
*  ret = PTR_ERR(e1);
)
  ...
  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-24 08:38:27 -06:00
Heikki Krogerus
08f871a3ac usb: dwc3: host: convey the PHYs to xhci
On some platforms a PHY may need to be handled also in the
host controller driver. Exynos5420 SoC requires some "PHY
tuning" based on the USB speed. This patch delivers dwc3's
PHYs to the xhci platform device when it's created.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
2014-11-22 13:58:48 +05:30
Vivek Gautam
ed692a99f3 usb: dwc3: exynos: Add provision for AXI UpScaler clock on exynos7
DWC3 controller on Exynos7 SoC has separate control for
AXI UpScaler which connects DWC3 DRD controller to AXI bus.
Get the gate clock for the same to control it across power
cycles.

Suggested-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-21 09:07:29 -06:00
Vivek Gautam
72d996fc7a usb: dwc3: exynos: Add provision for suspend clock
DWC3 controller on Exynos SoC series have separate control for
suspend clock which replaces pipe3_rx_pclk as clock source to
a small part of DWC3 core that operates when SS PHY is in its
lowest power state (P3) in states SS.disabled and U3.

Suggested-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-21 09:06:43 -06:00
Vivek Gautam
c1a3acaadd usb: dwc3: exynos: Remove local variable for clock from probe
There's no need to keep one local variable for clock, and
then assign the same to 'clk' member of dwc3_exynos.
Just cleaning it up.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-21 09:06:40 -06:00
Julia Lawall
62c606978a usb: dwc3: keystone: fix error return code
Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-20 13:35:46 -06:00
Felipe Balbi
a4722fd3f2 usb: dwc3: trace: don't save pointers
There was another instance where we were
holding pointers which could be long gone.

Fix that by caching only values pointed to
by such pointer.

Because no crash has been observed, this patch
will be sent on v3.19 merge window, instead of
-rc.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-20 10:12:32 -06:00
Felipe Balbi
8e74475b0e usb: dwc3: gadget: use udc-core's reset notifier
Replace usb_gadget_driver's disconnect with udc-core's reset notifier at
bus reset handler.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-10 17:19:34 -06:00
Felipe Balbi
520fe76336 usb: dwc3: ep0: fix for dead code
commit 6856d30 (usb: dwc3: ep0: return early
on NULL requests) tried to fix a minor corner
case where we could dereference a NULL pointer
but it also ended up introducing some dead code.

Unfortunately, that dead code, if reached, could
end up starving the endpoint request list because
a request would never be given back when it should.

Fix this by moving the check for empty request list
before its first use.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-10 14:39:44 -06:00
Felipe Balbi
cd72f890d2 usb: dwc3: core: enable phy suspend quirk on non-FPGA
as it turns out, at least AM437x silicon (non-FPGA)
needs to enable PHY suspend quirk. So let's allow
for PHY suspend quirk to be used with non-FPGA
builds too.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-06 16:18:19 -06:00
Jingoo Han
5eb125b55c usb: dwc3: ep0: remove unnecessary break after return
Fix the following checkpatch warning.

  WARNING: break is not useful after a goto or return

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-05 13:33:10 -06:00
Jingoo Han
b4c9f578cb usb: dwc3: exynos: remove non-DT support for Exynos Specific Glue layer
DWC3 Exynos Specific Glue layer can be used only for Exynos SoCs.
In addition, non-DT for EXYNOS SoCs is not supported from v3.11;
thus, there is no need to support non-DT for DWC3 Exynos Specific
Glue layer.

The 'linux/platform_data/dwc3-exynos.h' file has been used for
non-DT support. Thus, the 'dwc3-exynos.h' file is removed, because
it is not used anymore.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-05 13:22:19 -06:00
Huang Rui
460d098cb6 usb: dwc3: make HIRD threshold configurable
HIRD threshold should be configurable by different platforms.

From DesignWare databook:
When HIRD_Threshold[4] is set to 1b1 and HIRD value is greater than or
equal to the value in HIRD_Threshold[3:0], dwc3 asserts output signals
utmi_l1_suspend_n to put PHY into Deep Low-Power mode in L1.

When HIRD_Threshold[4] is set to 1b0 or the HIRD value is less than
HIRD_Threshold[3:0], dwc3 asserts output signals utmi_sleep_n on L1.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:41 -06:00
Huang Rui
9755449d56 usb: dwc3: add support for AMD Nolan platform
This patch adds support for AMD Nolan (NL) FPGA and SoC platform.

Cc: Jason Chang <jason.chang@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:40 -06:00
Huang Rui
0effe0a3e7 usb: dwc3: add disable usb2 suspend phy quirk
This patch adds disable usb2 suspend phy quirk, and some special platforms
can configure that if it is needed.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:39 -06:00
Huang Rui
59acfa2081 usb: dwc3: add disable usb3 suspend phy quirk
This patch adds disable usb3 suspend phy quirk, and some special platforms
can configure that if it is needed.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:39 -06:00
Huang Rui
6b6a0c9a3f usb: dwc3: add Tx de-emphasis quirk
This patch adds Tx de-emphasis quirk, and the Tx de-emphasis value is
configurable according to PIPE3 specification.

Value		Description
0		-6dB de-emphasis
1		-3.5dB de-emphasis
2		No de-emphasis
3		Reserved

It can be configured on DT or platform data.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:39 -06:00
Huang Rui
2164a47620 usb: dwc3: set SUSPHY bit for all cores
It is recommended to set USB3 and USB2 SUSPHY bits to '1' after the core
initialization is completed above the dwc3 revision 1.94a.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:38 -06:00
Huang Rui
14f4ac53df usb: dwc3: add rx_detect to polling lfps quirk
This patch adds RX_DETECT to Polling.LFPS control quirk, and some special
platforms can configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:38 -06:00
Huang Rui
fb67afca17 usb: dwc3: add lfps filter quirk
This patch adds LFPS filter quirk, and some special platforms can configure
that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:38 -06:00
Huang Rui
41c06ffdf9 usb: dwc3: add delay phy power change quirk
This patch adds delay PHY power change from P0 to P1/P2/P3 when link state
changing from U0 to U1/U2/U3 respectively, and some special platforms can
configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:37 -06:00
Huang Rui
a2a1d0f583 usb: dwc3: add delay p1p2p3 quirk
This patch adds delay P0 to P1/P2/P3 quirk for U2/U2/U3, and some special
platforms can configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:37 -06:00
Huang Rui
df31f5b3a6 usb: dwc3: add request p1p2p3 quirk
This patch adds request P1/P2/P3 quirk for U2/U2/U3, and some special
platforms can configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:37 -06:00
Huang Rui
b5a65c4063 usb: dwc3: add P3 in U2 SS inactive quirk
This patch adds P3 in U2 SS inactive quirk, and some special platforms can
configure that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:36 -06:00
Huang Rui
9a5b2f3167 usb: dwc3: add u2exit lfps quirk
This patch adds u2exit lfps quirk, and some special platforms can configure
that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:36 -06:00
Huang Rui
80caf7d21a usb: dwc3: add lpm erratum support
When parameter DWC_USB3_LPM_ERRATA_ENABLE is enabled in Andvanced
Configuration of coreConsultant, it supports of xHCI BESL Errata Dated
10/19/2011 is enabled in host mode. In device mode it adds the capability
to send NYET response threshold based on the BESL value received in the LPM
token, and the threhold is configurable for each soc platform.

This patch adds an entry that soc platform is able to define the lpm
capacity with their own device tree or bus glue layer.

[ balbi@ti.com : added devicetree documentation, spelled threshold
		completely, made sure threshold is only applied to
		proper core revisions. ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:36 -06:00
Huang Rui
3b81221a52 usb: dwc3: add disscramble quirk
This patch adds disscramble quirk, and it only needs to be enabled at fpga
board on some vendor platforms.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:36 -06:00
Huang Rui
8f317b4714 usb: dwc3: initialize platform data at pci glue layer
This patch initializes platform data at pci glue layer, and SoCs x86-based
platform vendor is able to define their flags in platform data at bus glue
layer. Then do some independent behaviors at dwc3 core level.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:35 -06:00
Huang Rui
946bd579a6 usb: dwc3: add a flag to check if it is fpga board
Some chip vendor is on pre-silicon phase, which needs to use the simulation
board. It should have the same product and vendor id with the true soc, but
might have some minor different configurations.

Below thread discussion proposes to find a method to distinguish between
simulation board and soc.

http://marc.info/?l=linux-usb&m=141194772206369&w=2

In Andvanced Configuration of coreConsultant, there is the parameter of
DWC_USB_EN_FPGA. This bit has the function we need. And it would response as 7
bit of GHWPARAMS6 register. So it's able to check this functional bit to confirm
if works on FPGA board.

Reported-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:35 -06:00
Huang Rui
2eac399289 usb: dwc3: enable hibernation if to be supported
It enables hibernation if the function is set in coreConsultant.

Suggested-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:03:35 -06:00
Varka Bhadram
4d852011a5 usb: dwc3: keystone: remove duplicate check on resource
Sanity check on resource happening with devm_ioremap_resource().

Signed-off-by: Varka Bhadram <varkab@cdac.in>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:01:20 -06:00
Felipe Balbi
22835b807e usb: gadget: remove unnecessary 'driver' argument
now that no UDC driver relies on the extra
'driver' argument to ->udc_stop(), we can
safely remove it.

This commit is based on previous work by
Robert Baldyga <r.baldyga@samsung.com> which
can be found at [1]; however that patch turned
out to have a high probability of regressing
many UDC drivers because of a blind search & replace
s/driver/$udc->driver/ which caused the 'driver'
argument to stop_activity() to be a valid non-NULL
pointer when it should be NULL, thus causing UDCs
to mistakenly call gadget driver's ->disconnect()
callback.

[1] http://markmail.org/message/x5zneg4xea4zntab

Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:01:16 -06:00
Felipe Balbi
73359cef4f usb: dwc3: gadget: WARN() on bogus usb_ep_queue()
Some gadget/function drivers might want to do
improper request recycling by allocating a single
request from one particular endpoint and queueing
it to another completely unrelated endpoint.

One such case was found with f_loopback.c.

To prevent such cases from happening again, let's
WARN() so we get a loud enough failure and persuade
users to report errors.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:01:00 -06:00
Felipe Balbi
06a374ed13 usb: dwc3: gadget: set state to NOT_ATTACHED on disconnect_irq
whenever we get a Disconnect Interrupt, we should
make sure to update out udc state to NOT_ATTACHED,
otherwise sysfs will show wrong values.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:01:00 -06:00
Felipe Balbi
0b0231aa24 usb: dwc3: get rid of ->prepare()/->complete()
Using ->prepare()/->complete() to mask/unmask
IRQs is wrong at least for dwc3. We need to
make sure that by the end of ->resume(), IRQs
are working and ready to fire because a child
device may need working IRQs for its own ->resume()
method.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:58 -06:00
George Cherian
7ee2566ff5 usb: dwc3: dwc3-omap: get rid of ->prepare()/->complete()
Enabling the core interrupts in complete is too late for
XHCI, and stops it from proper operation. The root of the
problem is due to a disagreement between dwc3-omap and XHCI
about when IRQs should be enabled.

As it turns out, ->resume's documentation states that:

"... generally the driver is expected to start working
again, responding to hardware events and software requests
(the device itself may be left in a low-power state, waiting
for a runtime resume to occur) ..."

From that we infer that IRQs must be unmasked by the end of
->resume().

Due to that, we will remove ->prepare() and ->complete() and
disable/enable interrupts in ->suspend()/->resume().

Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:58 -06:00
Felipe Balbi
ccb072de57 usb: dwc3: ep0: trace ep0 TRBs too
Add TRB tracepoints for ep0 TRBs as that
might help finding bugs with ep0 handling.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:55 -06:00
Heikki Krogerus
404905a604 usb: dwc3: add ACPI support
Adding ACPI ID used on newer Intel SoCs.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:54 -06:00
Heikki Krogerus
19bacdc925 usb: dwc3: core: only setting the dma_mask when needed
If the probe drivers have already set the dma_mask, not
replacing the value.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:53 -06:00
Felipe Balbi
dab716cd9a usb: dwc3: trace: remove unnecessary newline character
tracing infrastructure already adds those for us.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:53 -06:00
Felipe Balbi
fa0ea13e9f usb: dwc3: core: write LINUX_VERSION_CODE to our GUID register
DWC3's GUID register is supposed to be used to write
any sort of version we might want. It helps when getting
bug reports for platforms you don't have HW to know
which kernel version of the driver was running on the
platform.

Because we don't really track driver version, but we _do_
track the kernel version, let's write LINUX_VERSION_CODE to
that register and use it for debugging.

Reviewed-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-11-03 10:00:53 -06:00
Jack Pham
1200a82a59 usb: dwc3: gadget: Properly initialize LINK TRB
On ISOC endpoints the last trb_pool entry used as a
LINK TRB is not getting zeroed out correctly due to
memset being called incorrectly and in the wrong place.
If pool allocated from DMA was not zero-initialized
to begin with this will result in the size and ctrl
values being random garbage. Call memset correctly after
assignment of the trb_link pointer.

Fixes: f6bafc6a1c ("usb: dwc3: convert TRBs into bitshifts")
Cc: <stable@vger.kernel.org> # v3.4+
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-23 13:57:24 -05:00
Roger Quadros
b01ff5cb2f Revert "usb: dwc3: dwc3-omap: Disable/Enable only wrapper interrupts in prepare/complete"
This reverts commit 02dae36aa6.

That commit is bogus in two ways:

1) There's no way dwc3-omap's ->suspend() can cause any effect
	on xhci's ->suspend(). Linux device driver model guarantees
	that a parent's ->suspend() will only be called after all
	children are suspended. dwc3-omap is the parent of the
	parent of xhci.

2) When implementing Deep Sleep states where context is lost,
	USBOTGSS_IRQ0 register, well, looses context so we
	_must_ rewrite it otherwise core IRQs will never be
	reenabled and USB will appear to be dead.

Fixes: 02dae36 (usb: dwc3: dwc3-omap: Disable/Enable only
	wrapper interrupts in prepare/complete)
Cc: <stable@vger.kernel.org> # v3.17
Cc: George Cherian <george.cherian@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-23 09:55:41 -05:00
Felipe Balbi
36f84ffb45 usb: dwc3: ep0: fix Data Phase for transfer sizes aligned to wMaxPacketSize
According to Section 8.5.3.2 of the USB 2.0 specification,
a USB device must terminate a Data Phase with either a
short packet or a ZLP (if the previous transfer was
a multiple of wMaxPacketSize).

For reference, here's what the USB 2.0 specification, section
8.5.3.2 says:

"
8.5.3.2 Variable-length Data Stage

A control pipe may have a variable-length data phase
in which the host requests more data than is contained
in the specified data structure. When all of the data
structure is returned to the host, the function should
indicate that the Data stage is ended by returning a
packet that is shorter than the MaxPacketSize for the
pipe. If the data structure is an exact multiple of
wMaxPacketSize for the pipe, the function will return
a zero-length packet to indicate the end of the Data
stage.
"

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-23 09:55:35 -05:00
Felipe Balbi
6856d30c6c usb: dwc3: ep0: return early on NULL requests
if our list of requests is empty, return early.

There's really nothing to be done in case our
request list is empty anyway because the only
situation where we our list is empty, is when
we're transferring ZLPs.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-20 15:58:49 -05:00
Alan Cox
7d643664ea usb: dwc3: pci: Add PCI ID for Intel Braswell
The device controller is the same but it has different PCI ID. Add this new
ID to the driver's list of supported IDs.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-20 15:58:49 -05:00
Felipe Balbi
7a60855972 usb: dwc3: gadget: fix set_halt() bug with pending transfers
According to our Gadget Framework API documentation,
->set_halt() *must* return -EAGAIN if we have pending
transfers (on either direction) or FIFO isn't empty (on
TX endpoints).

Fix this bug so that the mass storage gadget can be used
without stall=0 parameter.

This patch should be backported to all kernels since v3.2.

Cc: <stable@vger.kernel.org> # v3.2+
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-20 15:58:48 -05:00
Felipe Balbi
95aa4e8d65 usb: dwc3: gadget: hold the lock through set_wedge()'s life
Instead of releasing the lock and calling locked
versions of our set_halt() methods, let's hold
the lock all the way through and call unlocked
versions of those functions.

Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-10-20 15:58:48 -05:00