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commit 59861547ec9a9736e7882f6fb0c096a720ff811a upstream.
The driver defines three states for a cppi channel.
- idle: .chan_busy == 0 && not in .pending list
- pending: .chan_busy == 0 && in .pending list
- busy: .chan_busy == 1 && not in .pending list
There are cases in which the cppi channel could be in the pending state
when cppi41_dma_issue_pending() is called after cppi41_runtime_suspend()
is called.
cppi41_stop_chan() has a bug for these cases to set channels to idle state.
It only checks the .chan_busy flag, but not the .pending list, then later
when cppi41_runtime_resume() is called the channels in .pending list will
be transitioned to busy state.
Removing channels from the .pending list solves the problem.
Fixes: 975faaeb9985 ("dma: cppi41: start tear down only if channel is busy")
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Bin Liu <b-liu@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 362f4562466c3b9490e733e06999025638310d4a upstream.
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
together with recent MUSB changes allowed USB and DMA on BeagleBone to idle
when no cable is connected. But looks like few corner case issues still
remain.
Looks like just by re-plugging USB cable about ten or so times on BeagleBone
when configured in USB peripheral mode we can get warnings and eventually
trigger an oops in cppi41 DMA:
WARNING: CPU: 0 PID: 14 at drivers/dma/cppi41.c:1154 cppi41_runtime_suspend+
x28/0x38 [cppi41]
...
WARNING: CPU: 0 PID: 14 at drivers/dma/cppi41.c:452
push_desc_queue+0x94/0x9c [cppi41]
...
Unable to handle kernel NULL pointer dereference at virtual
address 00000104
pgd = c0004000
[00000104] *pgd=00000000
Internal error: Oops: 805 [#1] SMP ARM
...
[<bf0d92cc>] (cppi41_runtime_resume [cppi41]) from [<c0589838>]
(__rpm_callback+0xc0/0x214)
[<c0589838>] (__rpm_callback) from [<c05899ac>] (rpm_callback+0x20/0x80)
[<c05899ac>] (rpm_callback) from [<c0589460>] (rpm_resume+0x504/0x78c)
[<c0589460>] (rpm_resume) from [<c058a1a0>] (pm_runtime_work+0x60/0xa8)
[<c058a1a0>] (pm_runtime_work) from [<c0156120>] (process_one_work+0x2b4/0x808)
This is because of a race with runtime PM and cppi41_dma_issue_pending()
as reported by Alexandre Bailon <abailon@baylibre.com> in earlier
set of patches. Based on mailing list discussions we however came to the
conclusion that a different fix from Alexandre's fix is needed in order
to guarantee that DMA is really active when we try to use it.
To fix the issue, we need to add a driver specific flag as we otherwise
can have -EINPROGRESS state set by runtime PM and can't rely on
pm_runtime_active() to tell us when we can use the DMA.
And we need to make sure the DMA transfers get triggered in the queued
order. So let's always queue the transfers, then flush the queue
from both cppi41_dma_issue_pending() and cppi41_runtime_resume()
as suggested by Grygorii Strashko <grygorii.strashko@ti.com> in an
earlier example patch.
For reference, this is also documented in Documentation/power/runtime_pm.txt
in the example at the end of the file as pointed out by Grygorii Strashko
<grygorii.strashko@ti.com>.
Based on earlier patches from Alexandre Bailon <abailon@baylibre.com>
and Grygorii Strashko <grygorii.strashko@ti.com> modified based on
testing and what was discussed on the mailing lists.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Bin Liu <b-liu@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Patrick Titiano <ptitiano@baylibre.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reported-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Tested-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit ae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b upstream.
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
added runtime PM support for cppi41, but had corner case issues. Some of
the issues were fixed with commit 098de42ad670 ("dmaengine: cppi41: Fix
unpaired pm runtime when only a USB hub is connected"). That fix however
caused a new regression where we can get error -115 messages with USB on
BeagleBone when connecting a USB mass storage device to a hub.
This is because when connecting a USB mass storage device to a hub, the
initial DMA transfers can take over 200ms to complete and cppi41
autosuspend delay times out.
To fix the issue, we want to implement refcounting for chan_busy array
that contains the active dma transfers. Increasing the autosuspend delay
won't help as that the delay could be potentially seconds, and it's best
to let the USB subsystem to deal with the timeouts on errors.
The earlier attempt for runtime PM was buggy as the pm_runtime_get/put()
calls could get unpaired easily as they did not follow the state of
the chan_busy array as described in commit 098de42ad670 ("dmaengine:
cppi41: Fix unpaired pm runtime when only a USB hub is connected".
Let's fix the issue by adding pm_runtime_get() to where a new transfer
is added to the chan_busy array, and calls to pm_runtime_put() where
chan_busy array entry is cleared. This prevents any autosuspend timeouts
from happening while dma transfers are active.
Fixes: 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when
only a USB hub is connected")
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Bin Liu <b-liu@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Patrick Titiano <ptitiano@baylibre.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Tested-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Fix use of u32 instead of int for checking for negative errors values
as pointed out by Dan Carpenter <dan.carpenter@oracle.com>.
And while testing the PM runtime error path by randomly returning
failed values in runtime resume, I noticed two more places that need
fixing:
- If pm_runtime_get_sync() fails in probe, we still need to do
pm_runtime_put_sync() to keep the use count happy. We could call
pm_runtime_put_noidle() on the error path, but we're just going
to call pm_runtime_disable() after that so pm_runtime_put_sync()
will do what we want
- We should print an error if pm_runtime_get_sync() fails in
cppi41_dma_alloc_chan_resources() so we know where it happens
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 740b4be3f742 ("dmaengine: cpp41: Fix handling of error path")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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If we return early on pm_runtime_get() error, we need to also call
pm_runtime_put_noidle() as pointed out in a musb related thread
by Johan Hovold <johan@kernel.org>. This is to keep the PM runtime
use counts happy.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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On am335x with musb host we can end up with unpaired pm runtime calls
if a hub with no devices is connected and disconnected.
This is because of the conditional pm runtime calls which are always
a bad idea. Let's fix the issue by making them unconditional and
paired in each function.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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If musb controller is configured with USB peripherals and we have
enumerated with a USB host, we can get warnings on removal of the
modules:
WARNING: CPU: 0 PID: 1269 at drivers/dma/cppi41.c:391
cppi41_dma_free_chan_resources
Fix the issue by adding the missing pm_runtime_get to
cppi41_dma_free_chan_resources to make sure the pending work
list is cleared on removal.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Conflicts:
drivers/dma/cppi41.c
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We can occasionally get -EINPROGRESS for pm_runtime_get. In that case
we can just continue as we're queueing transfers anyways when
pm_runtime_active is not set.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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When CONFIG_PM_SLEEP is disabled, we get a build error in
the cppi41 dmaengine driver, since the runtime-pm functions
are hidden within the wrong #ifdef:
drivers/dma/cppi41.c:1158:21: error: 'cppi41_runtime_suspend' undeclared here (not in a function)
This removes the #ifdef and instead uses __maybe_unused
annotations that cannot have this problem.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Let's keep the device enabled between cppi41_dma_issue_pending()
and dmaengine_desc_get_callback_invoke() and rely on the PM runtime
autoidle timeout elsewhere.
As the PM runtime is for whole device, not for each channel,
we need to queue pending transfers if the device is PM runtime
suspended. Then we start the pending transfers in PM runtime
resume.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Let's just move code from cppi41_dma_issue_pending() to
push_desc_queue() as that's the only call to push_desc_queue().
We want to do this for PM runtime as we need to call push_desc_queue()
also for pending queued transfers from PM runtime resume.
No functional changes, just moves code around.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This is in preperation of moving to a callback that provides results to the
callback for the transaction. The conversion will maintain current behavior
and the driver must convert to new callback mechanism at a later time in
order to receive results.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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In cppi41_dma_prep_slave_sg() variable num is initialized to zero, but never
updated and a BUG_ON is checked for it being greater than zero which will be
always false.
Remove the bogus check and this variable
Reported-by: David Binderman <linuxdev.baldrick@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Add missing directions, residue_granularity,
srd_addr_widths and dst_addr_widths bitfields.
Without those we will see a kernel WARN()
when loading musb on am335x devices.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Split the device_control callback of the TI CPPI41 DMA driver to make use
of the newly introduced callbacks, that will eventually be used to retrieve
slave capabilities.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The manual says that we need to (repeatedly) set the TearDown-bit for
the endpoint in order to get the active transfer descriptor released.
Doing this "real" quick over and over again seems to work but it also
seems that the hardware might not have enough time to breathe. So I
though, hey lets add a udelay() between between the individual sets
of the bit.
This change with the g_zero testcase resulted in a warning about missing
transfer descriptor (we got the tear-down one). It seems that if the
hardware has some time it manages to release the transfer-descriptor on
the completion queue after the teaddown descriptor.
With this change, I observe that the transfer descriptor is released
after 20-30 retry loops.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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For a "complete" teardown we have to wait until the teardown descriptor
is returned by the hardware. The g_zero testcase "testusb -a -t 9" triggers
the following warning quite reliable:
|------------[ cut here ]------------
|WARNING: CPU: 0 PID: 0 at drivers/dma/cppi41.c:609 cppi41_dma_control+0x198/0x304()
|[<c003f84c>] (warn_slowpath_null) from [<c02be8d8>]
|[<c02be8d8>] (cppi41_dma_control) from [<bf08d25c>]
|[<bf08d25c>] (cppi41_dma_channel_abort [musb_hdrc])
|[<bf08bc38>] (nuke.constprop.10 [musb_hdrc])
|[<bf08bd08>] (musb_gadget_disable [musb_hdrc])
|[<bf252524>] (disable_endpoints [usb_f_ss_lb])
|[<bf2525d8>] (disable_source_sink [usb_f_ss_lb])
|[<bf25260c>] (sourcesink_set_alt [usb_f_ss_lb])
|[<bf23ad24>] (composite_setup [libcomposite])
|[<bf08a2f4>] (musb_g_ep0_irq [musb_hdrc])
|[<bf085ec4>] (musb_interrupt [musb_hdrc])
|[<bf0aeaf4>] (dsps_interrupt [musb_dsps])
|[<c0080ea8>] (handle_irq_event_percpu)
|[<c008112c>] (handle_irq_event)
|[<c008348c>] (handle_level_irq)
|[<c00807a8>] (generic_handle_irq)
|[<c000ee80>] (handle_IRQ)
|[<c00085f0>] (omap3_intc_handle_irq)
and complains about a TD descriptor which is not returned. I've been
looking at several things and haven't noticed anything unusual that
might lead to this.
The manual says "to try again" until the descriptor comes out. I limited
the amount of retries to 100 retries in order to avoid an infinite number
of retries and so a busy-loop. Back then testing revealed that the
number of retries were around 20-30 so 100 seemed a good upper limit.
This g_zero test reaches without a problem 98 retries and it jumps
sometimes to 101 on am335x-evm and so the WARN_ON() triggers. Same test
run on beaglebone black and the retries start at 122 and my max value so
far was at 128.
So lets rise the limit to 500.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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There is no need to init .owner field.
Based on the patch from Peter Griffin <peter.griffin@linaro.org>
"mmc: remove .owner field for drivers using module_platform_driver"
This patch removes the superflous .owner field for drivers which
use the module_platform_driver API, as this is overriden in
platform_driver_register anyway."
Signed-off-by: Kiran Padwal <kiran.padwal@smartplayin.com>
[for nvidia]
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This change uses managed resource APIs to allocate resources such as,
mem, irq in order to simplify the driver unload or failure cases
Signed-off-by: Kiran Padwal <kiran.padwal@smartplayin.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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When a 0-length packet is received on the bus, desc->pd0 yields 1,
which confuses the driver's users. This information is clearly wrong
and not in accordance to the datasheet, but it's been observed on an
AM335x board, very reproducible.
Fix this by looking at bit 19 in PD2 of the completed packet. This bit
will tell us if a zero-length packet was received on a queue. If it's
set, ignore the value in PD0 and report a total length of 0 instead.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Start the channel tear down only if the channel is busy, else just
bail out. In some cases its seen that by the time the tear down is
initiated the cppi completes the DMA, especially in ISOCH transfers.
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Set the return variable to an error code as done elsewhere in the function.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
{ ... return ret; }
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ret@p1 = 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: Vinod Koul <vinod.koul@intel.com>
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Return code of pm_runtime_get_sync() > 0 is not an error and may happen.
Noticed during rmmod & modprobe testing.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Most of the logic here is try and error since what actually happens does
not match the trm or I miss read it.
My first assumption was that the queue on which the tear-down descriptor
completes (their own complete queue vs "active descriptor" complete
queue) depends on the transfer direction. This seems not to be true
because I manage to trigger
| WARN_ON(c->desc_phys != desc_phys);
and the other few were fine means the tear-down descriptor was valid but
on different queue.
This patch changes the logic here to look on both queues for the
descriptor.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Use cppi41_pop_desc() when appropriate instead of open-coding the same
functionality again. That makes the code more readable. The function has
to be moved some lines up for this change.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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With active users over suspend/resume cycles, it turns out that
more registers, in particular DMA_TDFDQ and RXHPCRA0, have to be
restored on resume.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch adds support for suspend/resume functionality to the cppi41
DMA driver. The steps necessary to make the system resume properly were
figured out by trial-and-error. The code as it stands now is the
minimum that has to be done to put the musb host system on an AM33xx
system into an operable state after resume.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Makes the code more readable and compact. No functional change.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Fix a misspelled function name.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Instead of passing around struct plafform_device, use struct device and
save one level of dereferencing. This affects the following functions:
* cppi41_add_chans
* purge_descs
* deinit_cpii41
* init_descs
* init_cppi41
* cppi_glue_infos
It's just a cosmetic cleanup that makes the code more readable.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The test here should be ">=" instead of ">". The cdd->chan_busy[] array
has "ALLOC_DECS_NUM" elements.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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With enabled pm_runtime in the kernel the device won't work because it
is not "on" during the probe function. This patch enables the device via
pm_runtime on probe so it remains activated.
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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Before Randy figures out that this does not compile with CONFIG_BUG=n
here is a fix for it.
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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This driver is currently used by musb' cppi41 couter part. I may merge
both dma engine user of musb at some point but not just yet.
The driver seems to work in RX/TX mode in host mode, tested on mass
storage. I increaed the size of the TX / RX transfers and waited for the
core code to cancel a transfers and it seems to recover.
v2..3:
- use mall transfers on RX side and check data toggle.
- use rndis mode on tx side so we haveon interrupt for 4096 transfers.
- remove custom "transferred" hack and use dmaengine_tx_status() to
compute the total amount of data that has been transferred.
- cancel transfers and reclaim descriptors
v1..v2:
- RX path added
- dma mode 0 & 1 is working
- device tree nodes re-created.
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <djbw@fb.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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