linux-toradex.git/drivers/dma/at_hdmac.c, branch v3.2.16

at_hdmac: bugfix for enabling channel irq

2012-02-13T19:16:54+00:00

commit bda3a47c886664e86ee14eb79e9072b9e341f575 upstream.

commit 463894705e4089d0ff69e7d877312d496ac70e5b deleted redundant
chan_id and chancnt initialization in dma drivers as this is done
in dma_async_device_register().

However, atc_enable_irq() relied on chan_id set before registering
the device, what left only channel 0 functional for this driver.

This patch introduces atc_enable/disable_chan_irq() as a variant
of atc_enable/disable_irq() with the channel as explicit argument.

Signed-off-by: Nikolaus Voss 
Signed-off-by: Nicolas Ferre 
Signed-off-by: Vinod Koul 
Signed-off-by: Greg Kroah-Hartman

dmaengine: delete redundant chan_id and chancnt initialization in dma drivers

2011-09-20T06:21:33+00:00

dma_async_device_register will re-init chan_id and chancnt,
so whatever chan_id and chancnt are set in drivers, they will
be re-written by dma_async_device_register.

Cc: Nicolas Ferre 
Cc: Viresh Kumar 
Cc: Vinod Koul 
Cc: Piotr Ziecik 
Cc: Yong Wang 
Cc: Jaswinder Singh 
Cc: Pelagicore AB 
Signed-off-by: Barry Song 
Acked-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: fix way to specify cyclic capability

2011-08-19T13:10:04+00:00

In this driver, we can trigger cyclic transfer on peripherals-DMA interfaces.
It is dependent on driver implementation but cannot depend on a platform
property: we remove the dma_has_cap(DMA_CYCLIC, ) test which has no meaning.

Signed-off-by: Nicolas Ferre 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: add wrappers for testing channel state

2011-08-19T13:09:59+00:00

Cyclic property and paused state are encoded as bits in the channel status
bitfield. Tests of those bits are wrapped in convenient helper functions.

Signed-off-by: Nicolas Ferre 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: improve power management routines

2011-08-19T13:09:54+00:00

Save/restore dma controller state across a suspend-resume sequence.
The prepare() function will wait for the non-cyclic channels to become idle.
It also deals with cyclic operations with the start at next period while
resuming.

Signed-off-by: Nicolas Ferre 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: replace spin_lock* with irqsave variants

2011-08-19T13:09:48+00:00

dmaengine routines can be called from interrupt context and with
interrupts disabled. Whereas spin_unlock_bh can't be called from
such contexts. So this patch converts all spin_lock* routines
to irqsave variants.

Also, spin_lock() used in tasklet is converted to irqsave variants,
as tasklet can be interrupted, and dma requests from such interruptions
may also call spin_lock.

Idea from dw_dmac patch by Viresh Kumar.

Signed-off-by: Nicolas Ferre 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Vinod Koul

dma: at_hdmac.c: use resource_size

2011-06-06T08:13:59+00:00

Signed-off-by: H Hartley Sweeten 
Cc: Dan Williams 
Cc: Vinod Koul 
Signed-off-by: Vinod Koul

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

2011-05-28T19:35:15+00:00

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (33 commits)
  x86: poll waiting for I/OAT DMA channel status
  maintainers: add dma engine tree details
  dmaengine: add TODO items for future work on dma drivers
  dmaengine: Add API documentation for slave dma usage
  dmaengine/dw_dmac: Update maintainer-ship
  dmaengine: move link order
  dmaengine/dw_dmac: implement pause and resume in dwc_control
  dmaengine/dw_dmac: Replace spin_lock* with irqsave variants and enable submission from callback
  dmaengine/dw_dmac: Divide one sg to many desc, if sg len is greater than DWC_MAX_COUNT
  dmaengine/dw_dmac: set residue as total len in dwc_tx_status if status is !DMA_SUCCESS
  dmaengine/dw_dmac: don't call callback routine in case dmaengine_terminate_all() is called
  dmaengine: at_hdmac: pause: no need to wait for FIFO empty
  pch_dma: modify pci device table definition
  pch_dma: Support new device ML7223 IOH
  pch_dma: Support I2S for ML7213 IOH
  pch_dma: Fix DMA setting issue
  pch_dma: modify for checkpatch
  pch_dma: fix dma direction issue for ML7213 IOH video-in
  dmaengine: at_hdmac: use descriptor chaining help function
  dmaengine: at_hdmac: implement pause and resume in atc_control
  ...

Fix up trivial conflict in drivers/dma/dw_dmac.c

dmaengine: at_hdmac: pause: no need to wait for FIFO empty

2011-05-12T08:25:34+00:00

With the addition of the "pause" feature, an active wait was introduced
to check the "FIFO empty" event. This event was not always happening and
a timout contition was needed.
But, in some cases, this event depend on the peripheral connected to the
channel that is paused: FIFO becomes empty if the peripheral consumes data.
The timeout is pretty difficult to evaluate. Moreover, this check is not
needed.
In conclusion, it seems sensible to entirely remove the checking of
"FIFO empty" status when pausing.

Signed-off-by: Nicolas Ferre 
[commit msg edited for grammer]
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: use descriptor chaining help function

2011-05-09T06:14:13+00:00

A little function helps to chain descriptors:
it is already used in cyclic dma operations, now use it in memcpy and slave_sg
preparation functions.

Signed-off-by: Nicolas Ferre 
Signed-off-by: Vinod Koul