this patch implements the most basic pm_runtime
support for dwc3. Whenever USB cable is dettached,
then we will allow core to runtime_suspend.

Runtime suspending will involve completely tearing
down event buffers and require a full soft-reset of
the IP.

Note that a further optimization could be
implemented once we decide to support hibernation,
which is to allow runtime_suspend with cable
connected when bus is in U3. That's subject to a
separate patch, however.
Tested-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

when we call dwc3_gadget_giveback(), we end up
releasing our controller's lock. Another thread
could get scheduled and disable the endpoint,
subsequently setting dep->endpoint.desc to NULL.

In that case, we would end up dereferencing a NULL
pointer which would result in a Kernel Oops. Let's
avoid the problem by simply returning early if we
have a NULL descriptor.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

commit f3af3651 ("usb: dwc3: gadget: always
enable IOC on bulk/interrupt transfers") ended up
regressing Isochronous endpoints by clearing
DWC3_EP_BUSY flag too early, which resulted in
choppy audio playback over USB.

Fix that by partially reverting original commit and
making sure that we check for isochronous endpoints.

Fixes: f3af3651 ("usb: dwc3: gadget: always enable IOC
		on bulk/interrupt transfers")
Cc: <stable@vger.kernel.org>
Signed-off-by: Konrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: Rafal Redzimski <rafal.f.redzimski@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

As a micro-power optimization, let's only resume the
USB2 PHY if we're working on <=HIGHSPEED. If we're
gonna work on SUPERSPEED or SUPERSPEED+, there's no
point in resuming the USB2 PHY.

Fixes: 2b0f11df ("usb: dwc3: gadget: clear SUSPHY bit before ep cmds")
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

by holding gadget's IRQ number in dwc->irq_gadget,
it'll be simpler to free_irq() and disable the IRQ
in case an IRQ fires while we are runtime suspended.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

now that we have re-factored dwc3_core_init() and
dwc3_core_exit() we can use them for suspend/resume
operations.

This will help us avoid some common mistakes when
patching code when we have duplicated pieces of code
doing the same thing.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The idea of this patch is for dwc3_core_init() to
abstract all the details about how to initialize
dwc3 and dwc3_core_exit() to do the same for
teardown.

With this, we can simplify suspend/resume operations
by a large margin and always know that we're going
to start dwc3 from a known starting point.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

this patch is in preparation for some further
re-factoring in dwc3 initialization. No functional
changes.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

By adding a pointer to endpoint registers' base
address, we can avoid using our controller-wide
struct dwc3 pointer for everything. At some point
this will allow us to have per-endpoint locks which
will, in turn, let us queue requests to separate
endpoints in parallel.

Because of this change our debugfs interface and io
accessors need to be changed accordingly.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

In all call sites of dwc3_send_gadget_ep_cmd() we
already had a valid dep pointer, so instead of
passing dwc and dep->number, which would be used to
fetch the same pointer we already had, just pass dep
directly.

In other words, we're changing:

	struct dwc3_ep *dep = dwc[dep->number];

to just passing struct dwc3_ep *dep as argument.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Instead of using burst size to configure NUMP, we
should be using RxFIFO Size instead. DWC3 is smart
enough to know that it shouldn't burst in case burst
size is 0.
Reported-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

To aid code readability, we're gonna split
__dwc3_gadget_kick_transfer() into its constituent
parts: scatter gather and linear buffers.

That way, it's easier to follow the code and focus
debug effort when one or the other fails.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Instead of returning -EINVAL when someone calls
__dwc3_gadget_wakeup() in speeds > highspeed, let's
return 0. There are no problems for the driver for
calling it in superspeed as we cleanly just return.

This avoids an annoying WARN_ONCE() always
triggering during superspeed enumeration with LPM
enabled.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

When we send an endpoint command, we want that to
complete as soon as possible, so let's remove the
unnecessary udelay(1) call.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

sg_is_last() and list_is_last() will encode the
required information for the driver to make
decisions WRT CHN and LST bits.

While at that, also replace '1' with 'true' for
consistency.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

as it turns out, we don't need the extra 'start_new'
argument as that can be inferred from DWC3_EP_BUSY
flag.

Because of that, we can simplify
__dwc3_gadget_kick_transfer() by quite a bit, even
allowing us to prepare more TRBs unconditionally.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

If we're updating transfers, we can also prepare as
many TRBs as we can fit in the ring. Let's start
doing that.

This patch 'solves' a limitation of how many TRBs we
can prepare when we're getting close the end of the
ring. Instead driver to prepare only up to end of
the ring, we check if we have space to wrap around
the ring properly.

Note that this only happens when our enqueue and
dequeue pointers are equal (which is the case for
bulk endpoints after an XferComplete event).
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

that macro is unnecessary and just adds pointless
obfuscation. Let's remove it.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Instead of trying hard to stay connected to the
host, it's best (and far easier) to disconnect from
the host already.

Anything relying on KEEP_CONNECT will just have that
ignored, but we don't have proper hibernation
implementation yet, so there are no regressions.

In any case, hibernation is only useful for runtime
PM, not system sleep.

While at that, also remove dwc3.dcfg which has been
rendered unnecessary.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

we will be re-using it for suspend/resume, so
instead of duplicating code, let's just re-factor
the functions so they can be re-used.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The PLX USB2380 is a PCIe version of the NET2280 and behaves more like the
USB338x but without the USB3.0 superspeed support.

This was tested with g_ether, g_serial, g_mass_storage on a Gateworks
Ventana GW2383.

Cc: Justin DeFields <justindefields@gmail.com>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

With a default size of 16kiB and with maximum of 32
buffers, we can transfer up to 512kiB, however Linux
can transfer up to 1MiB in a single mass storage
block transfer to USB3 storage devices.

Because of this, 1MiB block transfers end up being
slower than 512kiB block transfers. Let's increase
maximum number of storage buffers to a ridiculous
amount (256) so that anybody wanting to test maximum
achievable throughput can do so.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

valid range for storage buffers is encoded in
Kconfig already. Instead of checking again, let's
drop fsg_num_buffers_validate() altogether.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Pull UDF fixes and a reiserfs fix from Jan Kara:
 "A couple of udf fixes (most notably a bug in parsing UDF partitions
  which led to inability to mount recent Windows installation media) and
  a reiserfs fix for handling kstrdup failure"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  reiserfs: check kstrdup failure
  udf: Use correct partition reference number for metadata
  udf: Use IS_ERR when loading metadata mirror file entry
  udf: Don't BUG on missing metadata partition descriptor

Pull dmaengine fixes from Vinod Koul:
 "Some fixes has piled up, so time to send them upstream.

  These fixes include:
   - at_xdmac fixes for residue and other stuff
   - update MAINTAINERS for dma dt bindings
   - mv_xor fix for incorrect offset"

* tag 'dmaengine-fix-4.7-rc4' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: mv_xor: Fix incorrect offset in dma_map_page()
  dmaengine: at_xdmac: double FIFO flush needed to compute residue
  dmaengine: at_xdmac: fix residue corruption
  dmaengine: at_xdmac: align descriptors on 64 bits
  MAINTAINERS: Add file patterns for dma device tree bindings

Pull ARM SoC fixes from Olof Johansson:
 "Another batch of fixes for ARM SoC platforms.  Most are smaller fixes.

  Two areas that are worth pointing out are:

   - OMAP had a handful of changes to voltage specs that caused a bit of
     churn, most of volume of change in this branch is due to this.

   - There are a couple of _rcuidle fixes from Paul that touch common
     code and came in through the OMAP tree since they were the ones who
     saw the problems.

 The rest is smaller changes across a handful of platforms"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (36 commits)
  ARM: dts: STi: stih407-family: Disable reserved-memory co-processor nodes
  ARM: dts: am437x-sk-evm: Reduce i2c0 bus speed for tps65218
  ARM: OMAP2+: timer: add probe for clocksources
  ARM: OMAP1: fix ams-delta FIQ handler to work with sparse IRQ
  memory: omap-gpmc: Fix omap gpmc EXTRADELAY timing
  arm: Use _rcuidle for smp_cross_call() tracepoints
  MAINTAINERS: Add myself as reviewer of ARM FSL/NXP
  ARM: OMAP: DRA7: powerdomain data: Remove unused pwrsts_mem_ret
  ARM: OMAP: DRA7: powerdomain data: Remove unused pwrsts_logic_ret
  ARM: OMAP: DRA7: powerdomain data: Set L3init and L4per to ON
  ARM: imx6ul: Fix Micrel PHY mask
  ARM: OMAP2+: Select OMAP_INTERCONNECT for SOC_AM43XX
  ARM: dts: DRA74x: fix DSS PLL2 addresses
  ARM: OMAP2: Enable Errata 430973 for OMAP3
  ARM: dts: socfpga: Add missing PHY phandle
  ARM: dts: exynos: Fix port nodes names for Exynos5420 Peach Pit board
  ARM: dts: exynos: Fix port nodes names for Exynos5250 Snow board
  ARM: dts: sun6i: yones-toptech-bs1078-v2: Drop constraints on dc1sw regulator
  ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator
  ARM: dts: sunxi: Add OLinuXino Lime2 eMMC to the Makefile
  ...

OMAP-GPMC: Fixes for for v4.7-rc cycle:

- Fix omap gpmc EXTRADELAY timing. The DT provided timings
were wrongly used causing devices requiring extra delay timing
to fail.

* tag 'gpmc-omap-fixes-for-v4.7' of https://github.com/rogerq/linux:
  memory: omap-gpmc: Fix omap gpmc EXTRADELAY timing
  + Linux 4.7-rc3
Signed-off-by: Olof Johansson <olof@lixom.net>

Merge tag 'omap-for-v4.7/fixes-powedomain' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

Fixes for omaps for v4.7-rc cycle:

- Fix dra7 for hardware issues limiting L4Per and L3init power domains
  to on state. Without this the devices may not work correctly after
  some time of use because of asymmetric aging. And related to this,
  let's also remove the unusable states.

- Always select omap interconnect for am43x as otherwise the am43x
  only configurations will not boot properly. This can happen easily
  for any product kernels that leave out other SoCs to save memory.

- Fix DSS PLL2 addresses that have gone unused for now

- Select erratum 430973 for omap3, this is now safe to do and can
  save quite a bit of debugging time for people who may have left
  it out.

* tag 'omap-for-v4.7/fixes-powedomain' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP: DRA7: powerdomain data: Remove unused pwrsts_mem_ret
  ARM: OMAP: DRA7: powerdomain data: Remove unused pwrsts_logic_ret
  ARM: OMAP: DRA7: powerdomain data: Set L3init and L4per to ON
  ARM: OMAP2+: Select OMAP_INTERCONNECT for SOC_AM43XX
  ARM: dts: DRA74x: fix DSS PLL2 addresses
  ARM: OMAP2: Enable Errata 430973 for OMAP3
  + Linux 4.7-rc2
Signed-off-by: Olof Johansson <olof@lixom.net>

Merge tag 'fixes-rcu-fiq-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

Fixes for omaps for v4.7-rc cycle:

- Two boot warning fixes from the RCU tree that should have gotten
  merged several weeks ago already but did not because of issues
  with who merges them. Paul has now split the RCU warning fixes into
  sets for various maintainers.

- Fix ams-delta FIQ regression caused by omap1 sparse IRQ changes

- Fix PM for omap3 boards using timer12 and gptimer, like the
  original beagleboard

- Fix hangs on am437x-sk-evm by lowering the I2C bus speed

* tag 'fixes-rcu-fiq-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: dts: am437x-sk-evm: Reduce i2c0 bus speed for tps65218
  ARM: OMAP2+: timer: add probe for clocksources
  ARM: OMAP1: fix ams-delta FIQ handler to work with sparse IRQ
  arm: Use _rcuidle for smp_cross_call() tracepoints
  arm: Use _rcuidle tracepoint to allow use from idle
Signed-off-by: Olof Johansson <olof@lixom.net>

This patch fixes a non-booting issue in Mainline.

When booting with a compressed kernel, we need to be careful how we
populate memory close to DDR start.  AUTO_ZRELADDR is enabled by default
in multi-arch enabled configurations, which place some restrictions on
where the kernel is placed and where it will be uncompressed to on boot.

AUTO_ZRELADDR takes the decompressor code's start address and masks out
the bottom 28 bits to obtain an address to uncompress the kernel to
(thus a load address of 0x42000000 means that the kernel will be
uncompressed to 0x40000000 i.e. DDR START on this platform).

Even changing the load address to after the co-processor's shared memory
won't render a booting platform, since the AUTO_ZRELADDR algorithm still
ensures the kernel is uncompressed into memory shared with the first
co-processor (0x40000000).

Another option would be to move loading to 0x4A000000, since this will
mean the decompressor will decompress the kernel to 0x48000000. However,
this would mean a large chunk (0x44000000 => 0x48000000 (64MB)) of
memory would essentially be wasted for no good reason.

Until we can work with ST to find a suitable memory location to
relocate co-processor shared memory, let's disable the shared memory
nodes.  This will ensure a working platform in the mean time.

NB: The more observant of you will notice that we're leaving the DMU
shared memory node enabled; this is because a) it is the only one in
active use at the time of this writing and b) it is not affected by
the current default behaviour which is causing issues.

Fixes: fe135c63 (ARM: dts: STiH407: Move over to using the 'reserved-memory' API for obtaining DMA memory)
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

Merge tag 'imx-fixes-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into fixes

The i.MX fixes for 4.7:
 - Correct Micrel PHY mask to fix the issue that i.MX6UL ethernet works
   in U-Boot but not in kernel.

* tag 'imx-fixes-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  ARM: imx6ul: Fix Micrel PHY mask
Signed-off-by: Olof Johansson <olof@lixom.net>

Pull ARM fixes from Russell King:
 "A couple of fixes for pmd_mknotpresent()/pmd_present() for LPAE
  systems"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8579/1: mm: Fix definition of pmd_mknotpresent
  ARM: 8578/1: mm: ensure pmd_present only checks the valid bit

Pull USB fixes from Greg KH:
 "Here are a bunch (65) of USB fixes for 4.7-rc4.  Sorry about the
  quantity, I've been slow in getting these out.

  The majority are the "normal" gadget, musb, and xhci fixes, that we
  all are used to.  There are also a few other tiny fixes resolving a
  number of reported issues that showed up in 4.7-rc1.

  All of these have been in linux-next"

* tag 'usb-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (65 commits)
  usbip: rate limit get_frame_number message
  usb: musb: sunxi: Remove bogus "Frees glue" comment
  usb: musb: sunxi: Fix NULL ptr deref when gadget is registered before musb
  usb: echi-hcd: Add ehci_setup check before echi_shutdown
  usb: host: ehci-msm: Conditionally call ehci suspend/resume
  MAINTAINERS: Add file patterns for usb device tree bindings
  usb: host: ehci-tegra: Avoid getting the same reset twice
  usb: host: ehci-tegra: Grab the correct UTMI pads reset
  USB: mos7720: delete parport
  USB: OHCI: Don't mark EDs as ED_OPER if scheduling fails
  phy: ti-pipe3: Program the DPLL even if it was already locked
  usb: musb: Stop bulk endpoint while queue is rotated
  usb: musb: Ensure rx reinit occurs for shared_fifo endpoints
  usb: musb: host: correct cppi dma channel for isoch transfer
  usb: musb: only restore devctl when session was set in backup
  usb: phy: Check initial state for twl6030
  usb: musb: Use normal module_init for 2430 glue
  usb: musb: Remove pm_runtime_set_irq_safe
  usb: musb: Remove extra PM runtime calls from 2430 glue layer
  usb: musb: Return error value from musb_mailbox
  ...

Pull IIO and staging fixes from Greg KH:
 "Here are a number of IIO and staging bugfixes for 4.7-rc4.

  Nothing huge, the normal amount of iio driver fixes, and some small
  staging driver bugfixes for some reported problems (2 are reverts of
  patches that went into 4.7-rc1).  All have been in linux-next with no
  reported issues"

* tag 'staging-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (24 commits)
  Revert "Staging: rtl8188eu: rtw_efuse: Use sizeof type *pointer instead of sizeof type."
  Revert "Staging: drivers: rtl8188eu: use sizeof(*ptr) instead of sizeof(struct)"
  staging: lustre: lnet: Don't access NULL NI on failure path
  iio: hudmidity: hdc100x: fix incorrect shifting and scaling
  iio: light apds9960: Add the missing dev.parent
  iio: Fix error handling in iio_trigger_attach_poll_func
  iio: st_sensors: Disable DRDY at init time
  iio: st_sensors: Init trigger before irq request
  iio: st_sensors: switch to a threaded interrupt
  iio: light: bh1780: assign a static name
  iio: bh1780: dereference the client properly
  iio: humidity: hdc100x: fix IIO_TEMP channel reporting
  iio:st_pressure: fix sampling gains (bring inline with ABI)
  iio: proximity: as3935: fix buffer stack trashing
  iio: proximity: as3935: remove triggered buffer processing
  iio: proximity: as3935: correct IIO_CHAN_INFO_RAW output
  max44000: Remove scale from proximity
  iio: humidity: am2315: Remove a stray unlock
  iio: humidity: hdc100x: correct humidity integration time mask
  iio: pressure: bmp280: fix error message for wrong chip id
  ...

Pull driver core fixes from Greg KH:
 "Here are a small number of debugfs, ISA, and one driver core fix for
  4.7-rc4.

  All of these resolve reported issues.  The ISA ones have spent the
  least amount of time in linux-next, sorry about that, I didn't realize
  they were regressions that needed to get in now (thanks to Thorsten
  for the prodding!) but they do all pass the 0-day bot tests.  The
  others have been in linux-next for a while now.

  Full details about them are in the shortlog below"

* tag 'driver-core-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  isa: Dummy isa_register_driver should return error code
  isa: Call isa_bus_init before dependent ISA bus drivers register
  watchdog: ebc-c384_wdt: Allow build for X86_64
  iio: stx104: Allow build for X86_64
  gpio: Allow PC/104 devices on X86_64
  isa: Allow ISA-style drivers on modern systems
  base: make module_create_drivers_dir race-free
  debugfs: open_proxy_open(): avoid double fops release
  debugfs: full_proxy_open(): free proxy on ->open() failure
  kernel/kcov: unproxify debugfs file's fops

Pull char/misc driver fixes from Greg KH:
 "Here are a small number of char and misc driver fixes for 4.7-rc4.

  They resolve some minor issues that have been reported, and have all
  been in linux-next"

* tag 'char-misc-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  coresight: Handle build path error
  coresight: Fix erroneous memset in tmc_read_unprepare_etr
  coresight: Fix tmc_read_unprepare_etr
  coresight: Fix NULL pointer dereference in _coresight_build_path
  extcon: palmas: Fix boot up state of VBUS when using GPIO detection
  mcb: Acquire reference to carrier module in core
  mcb: Acquire reference to device in probe
  mei: don't use wake_up_interruptible for wr_ctrl

Pull btrfs fixes from Chris Mason:
 "The most user visible change here is a fix for our recent superblock
  validation checks that were causing problems on non-4k pagesized
  systems"

* 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: btrfs_check_super_valid: Allow 4096 as stripesize
  btrfs: remove build fixup for qgroup_account_snapshot
  btrfs: use new error message helper in qgroup_account_snapshot
  btrfs: avoid blocking open_ctree from cleaner_kthread
  Btrfs: don't BUG_ON() in btrfs_orphan_add
  btrfs: account for non-CoW'd blocks in btrfs_abort_transaction
  Btrfs: check if extent buffer is aligned to sectorsize
  btrfs: Use correct format specifier

Pull ACPI fix from Rafael Wysocki:
 "Revert a recent ACPICA commit that introduced a suspend-to-RAM
  regression on one system due to incorrect information in its ACPI
  tables that had not been taken into consideration at all before (and
  everything worked), but the commit in question started to use it"

* tag 'acpi-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "ACPICA: ACPI 2.0, Hardware: Add access_width/bit_offset support for acpi_hw_write()"

Pull power management fixes from Rafael Wysocki:
 "Fixes for two recent regressions that may lead to degraded performance
  (operating performance points framework, intel_pstate).

  Specifics:

   - Fix a recent regression in the intel_pstate driver that may lead to
     degraded performance on some systems due to missing turbo state
     entry in the table returned by the ACPI _PSS object (Srinivas
     Pandruvada).

   - Fix a recent regression in the OPP (operating performance points)
     framework that may lead to degraded performance on some systems
     where the OPP table is created too early (Viresh Kumar)"

* tag 'pm-4.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / OPP: Add 'UNKNOWN' status for shared_opp in struct opp_table
  cpufreq: intel_pstate: Adjust _PSS[0] freqeuency if needed