linux-stable.git/drivers/dma/dmaengine.c, branch v4.1

dmaengine: Fix choppy sound because of unimplemented resume

2015-06-12T09:52:26+00:00

Some drivers implement only pause operation (no resuming). Example is
pl330 where pause is needed for getting residuum. pl330 does not support
resume operation, transfer must be stopped after pause.

However for slaves this is exposed always as "pause and resume" which
introduces subtle errors on Odroid U3 board (Exynos4412 with pl330).
After adding pause function to pl330 driver the audio playback
(utilizing DMA) gets choppy after some time (approximately 24 hours).

Fix this by exposing "cmd_pause" if and only if pause and resume are
implemented.

Signed-off-by: Krzysztof Kozlowski 
Reported-by: gabriel@unseen.is
Reported-by: Marek Szyprowski 
Cc: 
Fixes: 88987d2c7534 ("dmaengine: pl330: add DMA_PAUSE feature")
Acked-by: Maxime Ripard 
Signed-off-by: Vinod Koul

dmaengine: increment privatecnt when using dma_get_any_slave_channel

2015-04-29T11:17:57+00:00

Channels allocated via dma_get_any_slave_channel were not increasing
the counter tracking private allocations.  When these channels were
released, privatecnt may erroneously fall to zero.  The DMA device
would then lose its DMA_PRIVATE cap and fail to allocate future private
channels (via private_candidate) as any allocations still outstanding
would incorrectly be seen as public allocations.

Signed-off-by: Christopher Freeman 
Signed-off-by: Vinod Koul

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2015-04-24T16:49:37+00:00

Pull slave-dmaengine updates from Vinod Koul:

 - new drivers for:
        - Ingenic JZ4780 controller
        - APM X-Gene controller
        - Freescale RaidEngine device
        - Renesas USB Controller

  - remove device_alloc_chan_resources dummy handlers

  - sh driver cleanups for peri peri and related emmc and asoc patches
    as well

  - fixes and enhancements spread over the drivers

* 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma: (59 commits)
  dmaengine: dw: don't prompt for DW_DMAC_CORE
  dmaengine: shdmac: avoid unused variable warnings
  dmaengine: fix platform_no_drv_owner.cocci warnings
  dmaengine: pch_dma: fix memory leak on failure path in pch_dma_probe()
  dmaengine: at_xdmac: unlock spin lock before return
  dmaengine: xgene: devm_ioremap() returns NULL on error
  dmaengine: xgene: buffer overflow in xgene_dma_init_channels()
  dmaengine: usb-dmac: Fix dereferencing freed memory 'desc'
  dmaengine: sa11x0: report slave capabilities to upper layers
  dmaengine: vdma: Fix compilation warnings
  dmaengine: fsl_raid: statify fsl_re_chan_probe
  dmaengine: Driver support for FSL RaidEngine device.
  dmaengine: xgene_dma_init_ring_mngr() can be static
  Documentation: dma: Add documentation for the APM X-Gene SoC DMA device DTS binding
  arm64: dts: Add APM X-Gene SoC DMA device and DMA clock DTS nodes
  dmaengine: Add support for APM X-Gene SoC DMA engine driver
  dmaengine: usb-dmac: Add Renesas USB DMA Controller (USB-DMAC) driver
  dmaengine: renesas,usb-dmac: Add device tree bindings documentation
  dmaengine: edma: fixed wrongly initialized data parameter to the edma callback
  dmaengine: ste_dma40: fix implicit conversion
  ...

Revert "dmaengine: Add a warning for drivers not using the generic slave caps retrieval"

2015-04-11T20:46:07+00:00

This reverts commit ecc19d17868be9c9f8f00ed928791533c420f3e0.

It added a new warning to try to encourage driver writers to set the
device capabities properly, but drivers haven't been updated and in the
meantime it just generaters a scary message that users cannot actually
do anything about.

Warnings like these are appropriate if you actually expect to fix the
code that causes them.  They are not appropriate for releases.

Requested-by: Peter Hurley 
Signed-off-by: Linus Torvalds

dmaengine: Remove FSF mailing addresses

2015-03-16T16:58:15+00:00

Free Software Foundation mailing address has been moved in the past and some
of the addresses here are outdated. Remove them from file headers since the
COPYING file in the kernel sources includes it.

Signed-off-by: Jarkko Nikula 
Signed-off-by: Vinod Koul

dmaengine: Remove net_dma_find_channel

2015-03-05T16:16:48+00:00

Since commit 7bced397510a ("net_dma: simple removal") removed the net_dma
support entirely, net_dma_find_channel has no users left. Remove the function
entirely.

Signed-off-by: Maxime Ripard 
Signed-off-by: Vinod Koul

dmaengine: Move dma_get_slave_caps() implementation to dmaengine.c

2015-01-18T14:25:57+00:00

The function is too big to be a static inline.

Signed-off-by: Laurent Pinchart 
Signed-off-by: Vinod Koul

dmaengine: Add a warning for drivers not using the generic slave caps retrieval

2014-12-22T07:04:21+00:00

For the slave caps retrieval to be really useful, most drivers need to
implement it.

Hence, we need to be slightly more aggressive, and trigger a warning at
registration time for drivers that don't fill their caps infos in order to
encourage them to implement it.

Signed-off-by: Maxime Ripard 
Acked-by: Laurent Pinchart 
Signed-off-by: Vinod Koul

dmaengine: Remove the need to declare device_control

2014-12-22T06:58:56+00:00

In order to migrate the drivers without triggering a BUG_ON for the converted
drivers, which would cause bisectability issues, we need to remove that check
before removing the device_control function entirely.

Signed-off-by: Maxime Ripard 
Acked-by: Laurent Pinchart 
Signed-off-by: Vinod Koul

dmaengine: Make channel allocation callbacks optional

2014-12-22T06:58:55+00:00

Nowadays, some drivers don't have anything in there channel allocation
callbacks anymore.

Remove the BUG_ON if those callbacks aren't implemented, in order to allow
drivers to not implement them.

Signed-off-by: Maxime Ripard 
Acked-by: Laurent Pinchart 
Signed-off-by: Vinod Koul