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>

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>

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>

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>

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>

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>

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>

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>

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>

The power_up function is used for otg or udc mode, but nost when
the driver is only configured for host mode:

drivers/usb/phy/phy-isp1301-omap.c:261:13: error: 'power_up' defined but not used [-Werror=unused-function]

This marks the function __maybe_unused to avoid the warning and
silently drop the definition when it is unused.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

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>

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>

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>

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>

Enable SuperSpeedPlus by programming the DCFG.speed and after
enumerating, set gadget->speed appropriately.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

Update various places where the speed is checked so that it takes into
account SuperSpeedPlus properly.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Update various registers fields definitions for the DWC_usb31 controller
for SuperSpeedPlus support.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Add a convenience function to check if the controller is DWC_usb31.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Enable superspeed plus configuration for the mass storage gadget.

The mass storage function doesn't do anything special for
SuperSpeedPlus. Just pass in the same SuperSpeed descriptors for
SuperSpeedPlus.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Update the debug message reporting the speeds that a configuration
supports for SuperSpeedPlus.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Configure the usb_ep using the SuperSpeedPlus descriptors if connected
in SuperSpeedPlus.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Enable writing of SuperSpeedPlus descriptors for any SuperSpeedPlus
capable configuration when connected in SuperSpeedPlus.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

If enumerated in SuperSpeedPlus, count the configurations that support
it.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

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>

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>

If a gadget supports SuperSpeedPlus or higher speeds, return a
SuperSpeedPlus USB Device Capability descriptor.

Currently this implementation returns a fixed descriptor with typical
values set.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

Add a function to check for SuperSpeedPlus capable gadgets.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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>

Merge tag 'usb-ci-v4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-next

Peter writes:

- Add platform interface to choose ttctrl.ttha
- Some tiny improvements

We want the USB fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Avoid printing an error if adding the device failes with return
value EPROBE_DEFFER. This may happen e.g. due to missing GPIO for
the vbus-supply regulator.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Peter Chen <peter.chen@nxp.com>