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The type of arg passed to dmatest_callback is struct dmatest_done.
It refers to test_done in struct dmatest_thread, not done_wait.
Fixes: 6f6a23a213be ("dmaengine: dmatest: move callback wait ...")
Signed-off-by: Yang Shunyong <shunyong.yang@hxt-semitech.com>
Acked-by: Adam Wallis <awallis@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The __memzero assembly code is almost identical to memset's except for
two orr instructions. The runtime performance of __memset(p, n) and
memset(p, 0, n) is accordingly almost identical.
However, the memset() macro used to guard against a zero length and to
call __memzero at compile time when the fill value is a constant zero
interferes with compiler optimizations.
Arnd found tha the test against a zero length brings up some new
warnings with gcc v8:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82103
And successively rremoving the test against a zero length and the call
to __memzero optimization produces the following kernel sizes for
defconfig with gcc 6:
text data bss dec hex filename
12248142 6278960 413588 18940690 1210312 vmlinux.orig
12244474 6278960 413588 18937022 120f4be vmlinux.no_zero_test
12239160 6278960 413588 18931708 120dffc vmlinux.no_memzero
So it is probably not worth keeping __memzero around given that the
compiler can do a better job at inlining trivial memset(p,0,n) on its
own. And the memset code already handles a zero length just fine.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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devm_ioremap_resource() already checks if the resource is NULL, so
remove the unnecessary platform_get_resource() error check.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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* pm-core: (29 commits)
dmaengine: rcar-dmac: Make DMAC reinit during system resume explicit
PM / runtime: Allow no callbacks in pm_runtime_force_suspend|resume()
PM / runtime: Check ignore_children in pm_runtime_need_not_resume()
PM / runtime: Rework pm_runtime_force_suspend/resume()
PM / wakeup: Print warn if device gets enabled as wakeup source during sleep
PM / core: Propagate wakeup_path status flag in __device_suspend_late()
PM / core: Re-structure code for clearing the direct_complete flag
PM: i2c-designware-platdrv: Optimize power management
PM: i2c-designware-platdrv: Use DPM_FLAG_SMART_PREPARE
PM / mfd: intel-lpss: Use DPM_FLAG_SMART_SUSPEND
PCI / PM: Use SMART_SUSPEND and LEAVE_SUSPENDED flags for PCIe ports
PM / wakeup: Add device_set_wakeup_path() helper to control wakeup path
PM / core: Assign the wakeup_path status flag in __device_prepare()
PM / wakeup: Do not fail dev_pm_attach_wake_irq() unnecessarily
PM / core: Direct DPM_FLAG_LEAVE_SUSPENDED handling
PM / core: Direct DPM_FLAG_SMART_SUSPEND optimization
PM / core: Add helpers for subsystem callback selection
PM / wakeup: Drop redundant check from device_init_wakeup()
PM / wakeup: Drop redundant check from device_set_wakeup_enable()
PM / wakeup: only recommend "call"ing device_init_wakeup() once
...
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The current (empty) system sleep callbacks rely on the PM core to force
a runtime resume to reinitialize the DMAC registers during system
resume. Without a reinitialization, e.g. SCIF DMA will hang silently
after a system resume on R-Car Gen3.
Make this explicit by using pm_runtime_force_{suspend,resume}() as the
system sleep callbacks instead. Use SET_LATE_SYSTEM_SLEEP_PM_OPS() as
DMA engines must be initialized before all DMA slave devices.
Fixes: 17218e0092f8 "PM / genpd: Stop/start devices without pm_runtime_force_suspend/resume()"
Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Sparse warns that 'sprd_dma_prep_dma_memcpy' should be static so make it
static.
drivers/dma/sprd-dma.c:713:32: warning:
symbol'sprd_dma_prep_dma_memcpy' was not declared. Should it be static?
Reviewed-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The hidma driver open codes populating address and IRQ resources from DT.
We have standard functions of_address_to_resource and of_irq_to_resource
for this, so use them instead.
The DT binding states each child should have 2 addresses and 1 IRQ, so we
can simplify the logic and do a fixed size resource allocation. Using the
standard of_address_to_resource will also do any address translation which
was missing.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Free BD consistent memory while freeing the channel
i.e in free_chan_resources.
Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes the below sparse warning in the driver
drivers/dma/xilinx/xilinx_dma.c: In function ‘xilinx_vdma_dma_prep_interleaved’:
drivers/dma/xilinx/xilinx_dma.c:1614:43: warning: variable ‘prev’ set but not used [-Wunused-but-set-variable]
struct xilinx_vdma_tx_segment *segment, *prev = NULL;
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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If the hardware is configured for Scatter Gather(SG) mode,
and hardware is idle, in the control register SG mode bit
must be set to a 0 then back to 1 by the software, to force
the CDMA SG engine to use a new value written to the CURDESC_PNTR
register, failure to do so could result errors from the dmaengine.
This patch updates the same.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney:
- Updates to use cond_resched() instead of cond_resched_rcu_qs()
where feasible (currently everywhere except in kernel/rcu and
in kernel/torture.c). Also a couple of fixes to avoid sending
IPIs to offline CPUs.
- Updates to simplify RCU's dyntick-idle handling.
- Updates to remove almost all uses of smp_read_barrier_depends()
and read_barrier_depends().
- Miscellaneous fixes.
- Torture-test updates.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Register layout of a typical TPCC_EVT_MUX_M_N register is such that the
lowest numbered event is at the lowest byte address and highest numbered
event at highest byte address. But TPCC_EVT_MUX_60_63 register layout is
different, in that the lowest numbered event is at the highest address
and highest numbered event is at the lowest address. Therefore, modify
ti_am335x_xbar_write() to handle TPCC_EVT_MUX_60_63 register
accordingly.
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The test should be >= ARRAY_SIZE() instead of > ARRAY_SIZE().
Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This avoid the following error when using an initramfs on wandboard quad
Direct firmware load for imx/sdma/sdma-imx6q.bin failed with error -2
Signed-off-by: Nicolas Chauvet <kwizart@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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some typos is comments, so fix them up
/s/enusres/ensures
/s/descripotrs/descriptors
/s/Submited/Submitted
/s/pollling/polling
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch updates the probe banner info based on the ip probed.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes below.
ERROR: open brace '{' following function definitions go on the next line
+static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev,
+ struct device_node *node) {
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes the kernel doc warnings
in the driver.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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descriptor scenario
As per axi dmaengine spec the software must not move the tail pointer
to a location that has not been updated (next descriptor field of the
h/w descriptor should always point to a valid address).
When user submits multiple descriptors on the recv side, with the
current driver flow the last buffer descriptor next descriptor field
points to a invalid location, resulting the invalid data or errors from the
axidma dmaengine.
This patch fixes this issue by creating a buffer descritpor chain during
channel allocation itself and use those buffer descriptors for the
subsequent dma operations.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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VDMA engine default frame buffer configuration is cirular mode.
in this mode dmaengine continuously circles through h/w configured fstore
frame buffers.
When vdma h/w is configured for more than one frame.
for example h/w is configured for n number of frames, user
submits less than n number of frames and triggered the dmaengine
using issue_pending API.
since the h/w (or) driver default configuraiton is circular mode
h/w tries to write/read from an invalid frame buffer resulting
errors from the vdma dmaengine.
This patch fixes this issue by enabling the park mode as
default mode configuration for frame buffers in s/w,
so that driver can handle all cases for "k" frames where n%k==0
(n is a multiple of k) by simply replicating the frame pointers.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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descriptor
Add variable for checking channel idle state to ensure that dma
descriptor is not submitted when dmaengine is in progress.
This will avoid the polling for a bit in the status register to know
dma state in the driver hot path.
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Incase of interrupt property is not present,
Driver is trying to free an invalid irq,
This patch fixes it by adding a check before freeing the irq.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes the below issues.
--> Need to clear the channel data count register
when overflow interrupts occurs.
--> Reduce the log level from _info to _dbg when
overflow interrupt occurs.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes the below warning
drivers/dma/xilinx/zynqmp_dma.c: In function 'zynqmp_dma_handle_ovfl_int':
drivers/dma/xilinx/zynqmp_dma.c:522:6: warning: variable 'val' set but not used [-Wunused-but-set-variable]
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch fixes the below kernel doc warnings
drivers/dma/xilinx/zynqmp_dma.c:552: info: Scanning doc for
zynqmp_dma_device_config
drivers/dma/xilinx/zynqmp_dma.c:558: warning: No description found for
return value of 'zynqmp_dma_device_config'
drivers/dma/xilinx/zynqmp_dma.c:649: info: Scanning doc for
zynqmp_dma_free_descriptors
drivers/dma/xilinx/zynqmp_dma.c:653: warning: No description found for
parameter 'chan'
drivers/dma/xilinx/zynqmp_dma.c:653: warning: Excess function parameter
'dchan' description in 'zynqmp_dma_free_descriptors'
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This patch adds runtime pm support in the driver.
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Previously enabled clks are only disabled if clk_prepare_enable() fails.
However, there are other error paths were the previously enabled
clocks are not disabled.
To fix the problem, fsl_disable_clocks() now takes the number of clocks
that shall be disabled + unprepared. For existing calls were all clocks
were already successfully prepared + enabled, DMAMUX_NR is passed to
disable + unprepare all clocks.
In error paths were only some clocks were successfully prepared +
enabled the loop counter is passed, in order to disable + unprepare
all successfully prepared + enabled clocks.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Andreas Platschek <andreas.platschek@opentech.at>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The location for destination event channel register has been relocated from
offset 0x28 to 0x40. Update the code accordingly.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Add support for probing the newer HW and also organize MSI capable hardware
into an array for maintenance reasons.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Driver is missing the interrupts if two requests are queued up at the same
time as the interrupt handler is servicing a request that was just
delivered.
The ISR clears the interrupt at the end but it could be clearing the
interrupt for an outstanding event. Therefore, second interrupt never
arrives.
Clear the interrupt first and then check for completions.
Also, make sure that request start and interrupt clear do not overlap in
time by using a spinlock.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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in error path of jz4740_dma_probe(), call clk_disable_unprepare() to clean
up.
Found by Linux Driver Verification project (linuxtesting.org).
Fixes: 25ce6c35fea0 MIPS: jz4740: Remove custom DMA API
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Trivial fix to spelling mistake in dev_err error message text.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Commit adfa543e7314 ("dmatest: don't use set_freezable_with_signal()")
introduced a bug (that is in fact documented by the patch commit text)
that leaves behind a dangling pointer. Since the done_wait structure is
allocated on the stack, future invocations to the DMATEST can produce
undesirable results (e.g., corrupted spinlocks).
Commit a9df21e34b42 ("dmaengine: dmatest: warn user when dma test times
out") attempted to WARN the user that the stack was likely corrupted but
did not fix the actual issue.
This patch fixes the issue by pushing the wait queue and callback
structs into the the thread structure. If a failure occurs due to time,
dmaengine_terminate_all will force the callback to safely call
wake_up_all() without possibility of using a freed pointer.
Cc: stable@vger.kernel.org
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=197605
Fixes: adfa543e7314 ("dmatest: don't use set_freezable_with_signal()")
Reviewed-by: Sinan Kaya <okaya@codeaurora.org>
Suggested-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Adam Wallis <awallis@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Now that READ_ONCE() implies smp_read_barrier_depends(), the
__cleanup() and ioat_abort_descs() functions no longer need their
smp_read_barrier_depends() calls, which this commit removes.
It is actually not entirely clear why this driver ever included
smp_read_barrier_depends() given that it appears to be x86-only and
given that smp_read_barrier_depends() has no effect whatsoever except
on DEC Alpha.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: <dmaengine@vger.kernel.org>
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Fix ptr_ret.cocci warnings:
drivers/dma/mic_x100_dma.c:483:1-3: WARNING: PTR_ERR_OR_ZERO can be used
Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
Generated by: scripts/coccinelle/api/ptr_ret.cocci
Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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To avoid race with vchan_complete, use the race free way to terminate
running transfer.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Even with the introduced vchan_synchronize() we can face race when
terminating a cyclic transfer.
If the terminate_all is called after the interrupt handler called
vchan_cyclic_callback(), but before the vchan_complete tasklet is called:
vc->cyclic is set to the cyclic descriptor, but the descriptor itself was
freed up in the driver's terminate_all() callback.
When the vhan_complete() is executed it will try to fetch the vc->cyclic
vdesc, but the pointer is pointing now to uninitialized memory leading to
(hard to reproduce) kernel crash.
In order to fix this, drivers should:
- call vchan_terminate_vdesc() from their terminate_all callback instead
calling their free_desc function to free up the descriptor.
- implement device_synchronize callback and call vchan_synchronize().
This way we can make sure that the descriptor is only going to be freed up
after the vchan_callback was executed in a safe manner.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The vchan_vdesc_fini() can be used to free or reuse a given descriptor
after it has been marked as completed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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atc_prep_dma_interleaved
_xt_ is being dereferenced before it is null checked, hence there is a
potential null pointer dereference.
Fix this by moving the pointer dereference after _xt_ has been null
checked.
This issue was detected with the help of Coccinelle.
Fixes: 4483320e241c ("dmaengine: Use Pointer xt after NULL check.")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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If the last test in 'ioat_dma_self_test()' fails, we must release all
the allocated resources and not just part of them.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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SYS/RT/Audio DMAC includes independent data buffers for reading
and writing. Therefore, the read transfer counter and write transfer
counter have different values.
TCR indicates read counter, and TCRB indicates write counter.
The relationship is like below.
TCR TCRB
[SOURCE] -> [DMAC] -> [SINK]
In the MEM_TO_DEV direction, what really matters is how much data has
been written to the device. If the DMA is interrupted between read and
write, then, the data doesn't end up in the destination, so shouldn't
be counted. TCRB is thus the register we should use in this cases.
In the DEV_TO_MEM direction, the situation is more complex. Both the
read and write side are important. What matters from a data consumer
point of view is how much data has been written to memory.
On the other hand, if the transfer is interrupted between read and
write, we'll end up losing data. It can also be important to report.
In the MEM_TO_MEM direction, what matters is of course how much data
has been written to memory from data consumer point of view.
Here, because read and write have independent data buffers, it will
take a while for TCR and TCRB to become equal. Thus we should check
TCRB in this case, too.
Thus, all cases we should check TCRB instead of TCR.
Without this patch, Sound Capture has noise after PulseAudio support
(= 07b7acb51d2 ("ASoC: rsnd: update pointer more accurate")), because
the recorder will use wrong residue counter which indicates transferred
from sound device, but in reality the data was not yet put to memory
and recorder will record it.
However, because DMAC is buffering data until it can be transferable
size, TCRB might not be updated.
For example, if consumer doesn't know how much data can be received,
it requests enough size to DMAC. But in reality, it might receive very
few data. In such case, DMAC just buffered it until transferable size,
and no TCRB updated.
In such case, this buffered data will be transferred if CHCR::DE bit was
cleared, and this is happen if rcar_dmac_chan_halt(). In other word, it
happen when consumer called dmaengine_terminate_all().
Because of this behavior, it need to flush buffered data when it returns
"residue" (= dmaengine_tx_status()).
Otherwise, consumer might calculate wrong things if it called
dmaengine_tx_status() and dmaengine_terminate_all() consecutively.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Tested-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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DMAC reads data from source device, and buffered it until transferable
size for sink device. Because of this behavior, DMAC is including
buffered data .
Now, CHCR DE bit is controlling DMA transfer enable/disable.
If DE bit was cleared during data transferring, or during buffering,
it will flush buffered data if source device was peripheral device
(The buffered data will be removed if source device was memory).
Because of this behavior, driver should ensure that DE bit is actually
0 after clearing.
This patch adds new rcar_dmac_chcr_de_barrier() and call it after CHCR
register access.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Tested-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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