Although timeout has never been experienced, still to make it
meaningful, its better to return error if it ever occurs.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

As per databook, ACCEPT{U1,U2}ENA bits should be set after receiving
SetConfiguration Command.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

as per databook, these bits are cleared by hardware on each USB reset,
so no need to clear it explicitly by software in reset ISR.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

as per data book any HIRD threshold value greater than 4b1100 is
invalid. So set the maximum valid value as default values.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

set_halt for ep0 is called to stall a deferred control responses by the
gadget.  We already have a function to stall default control endpoint.
This patch points set_halt for ep0 to the already available function.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NMichel Sanches <michel.sanches@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

whenever we want to stall ep0, we always call
dwc3_ep0_stall_and_restart() which makes sure
to send ep0state properly rendering the code
in __dwc3_gadget_ep_set_halt() duplicated.
Reported-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

resource_index is more human readable. No
functional changes.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

It makes it easier to read and also avoids
setting DWC3_EP_PENDING_REQUEST just so the
next branch evaluates true.

No functional changes otherwise.

Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Now we are sure that, if res_trans_idx is zero, then endpoint has been
stopped. So it's safe to just return if endpoint is already stopped. No
need to generate warning anymore.

While doing so, it's better to return when res_trans_idx is zero and
decrease one level of indentation.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>

[ balbi@ti.com: slightly changed commit log ]
Signed-off-by: NFelipe Balbi <balbi@ti.com>

In case of ep_disable and reset interrupt is received and, still there
was at least one request queued for dma transfer, then endpoint is
stopped first. Once endpoint is stopped, callback for all queued
request must be called.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

In case of ep_dequeue , if dequeued request was submitted for dma
transfer, then endpoint is stopped. Once endpoint is stooped, callback
for the dequeued request must be called.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

bMaxBurst field on endpoint companion descriptor
is supposed to contain the number of burst minus
1. When passing that to controller drivers, we
should be passing the real number instead (by
incrementing 1).

While doing that, also fix the assumption on
dwc3 that value comes decremented by one.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

It is needed to enumerate recent cores like 2.10a.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

By the time we're disabling the endpoint, HW
could already have posted more events to our
event buffer. In that case, we will receive
endpoint events for a disabled endpoint.

In order to protect ourselves from that situation,
we simply ignore endpoint interrupts whenever
the endpoint is disabled.
Tested-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

In case we get disconnected, we will call gadget
driver's disconnect method, which should make
sure to disable all endpoints. At that point
we will call stop_active_transfers() to make
sure we didn't leave any pending request on the
controller.
Tested-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

That IRQ is causing way too much trouble. We have
a different handling which was agreed with IP
provider and has been tested with FPGA and OMAP5.
Tested-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We never set CMDIOC bit for Start Transfer
command, so that code will never be used.
Tested-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If event status says that its last completed TRB but TRB is still owned
by HW then break from the loop, because we are not going to get correct
TRB status from trb control/size register.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If an IN transfer is missed on isoc endpoint, then driver must insure
that next ep_queue is properly handled.
This patch fixes this issue by starting a new transfer for next queued
request.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Currently in case of isoc, interrupt is programmed after each
TRB_NUM/4 ie 8th TRB. A TRB is programmed against each submitted
request from gadget. If we do not want to limit the minimum number of
necessary request to be submitted from gadget then we must receive
interrupt on each TRB submission. There can be such situation with a
gadget working with ping-pong buffer.

If a gadget does not want to receive interrupt after each request
completion then it may set no_interrupt flag.
Signed-off-by: NPratyush Anand <pratyush.anand@st.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

According to the databook, the DWC3 Core will
reset those bits to 0 on USB Bus Reset. This
means we must re-enable those bits on every
reset interrupt.

Because we will always get a Reset interrupt
after loading a gadget driver, we can, instead
of re-enabling something that was just lost,
move the handling of those bits to the Reset
Interrupt.

This patch fixes USB30CV U1/U2 Test.
Signed-off-by: NGerard CAUVY <g-cauvy1@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If we get a disconnect IRQ, we should take
the core out of low power mode so we can
reconnect afterwards.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If we don't read out the contents of the register
(in order to reinitialize 'reg' variable) we will
be writing unknown contents to the DCTL register
whenever we try to use dwc3_gadget_wakeup() function.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Recent cores (>= 1.94a) have a set of new features,
commands and a slightly different programming model.

This patch aims to support those changes.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

those two functions don't power PHYs, they simply
put them in suspend state. Rename to reflect better
what functions actually do.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

retries is used twice without being reinitialized.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

That semicolon doesn't do anything, it's not
needed and should be removed.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Remove redundant pointer to struct usb_endpoint_descriptor.
Signed-off-by: NIdo Shayevitz <idos@codeaurora.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

to avoid sprinkling magic constants on the driver
we define a constant to be used when allocating
setup_buffer and ep0_bounce buffer.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Issue an Update Transfer command after queuing a request to an isoc
EP with an active transfer. This is required according to the dwc3
databook. Pratyush Anand reports that this fixes a problem he was
having with Isoc IN transfers.

Tested-by: Pratyush Anand<pratyush.anand@st.com>
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We want to re-use that buffer for other USB
requests, so let's increase it to biggest
wMaxPacketSize for ep0 so it works for everything
we have in mind.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This will be used by the ep0 layer for implementing
Set SEL Standard Request.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

On device loading the driver enables LPM and the acceptance of U1 and U2
states. The [Set|Clear]Feature requests for "U1/U2" are forwarded
directly to the hardware and allow / forbid the initiation of the low
power links.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

All revisions prior to 2.20a have a known issue which
causes metastability state on Run/Stop bit if we
configure the core to work on any of the USB2-only
speeds.

The suggested workaround is just to never configure the
core to anything other than SuperSpeed.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Transfer resource index is cleared in hardware when XFERCOMPLETE
event is generated, so clear the driver's res_trans_idx variable
immediately after that event is received. The upcoming hibernation
patches depend on this change.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

dwc3_gadget_ep_set_wedge() and dwc3_gadget_set_selfpowered() were
modifying dwc->flags/dwc->is_selfpowered without taking the lock.
Since those modifications are non-atomic, that could cause other
flags to be corrupted. Fix them both to take the lock.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The loop in dwc3_gadget_set_link_state() was using a udelay(500),
which is a long time to delay in interrupt context. Change it to
udelay(5) and increase the loop count to match.
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Zero is a valid value for a microframe number. So remove the bogus
test for non-zero in dwc3_gadget_start_isoc().

Cc: stable@vger.kernel.org
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

It's wrong to use the size of array as an argument for strncat.
Memory corruption is possible. strlcat is exactly what we need here.

Cc: stable@vger.kernel.org
Signed-off-by: NAnton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If we have a non-ISOC endpoint, we will not have a Link TRB
pointing to the beginning of the TRB pool. On such endpoints,
we don't want to let the driver wrap around the TRB pool
otherwise controller will hang waiting for a valid TRB.

Cc: stable@vger.kernel.org
Signed-off-by: NPaul Zimmerman <paulz@synopsys.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>