kernel_samsung_smdk4412/drivers/dma/dw_dmac.c, branch replicant-6.0

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/dw_dmac: Update maintainer-ship

2011-05-25T13:00:37+00:00

Nobody is currently maintaining dw_dmac. We are using dw_dmac for SPEAr13xx and
are currently maintaining it. After discussing with Vinod, sending this patch to
update maintainer-ship of dw_dmac.

Signed-off-by: Viresh Kumar 
Acked-by: Havard Skinnemoen 
Signed-off-by: Vinod Koul

Haavard Skinnemoen has left Atmel

2011-05-18T21:24:50+00:00

Haavard's e-mail address at Atmel is no longer valid.

Signed-off-by: Jean Delvare 
Acked-by: Havard Skinnemoen 
Signed-off-by: Jiri Kosina

dmaengine/dw_dmac: implement pause and resume in dwc_control

2011-05-13T14:10:15+00:00

Some peripherals like amba-pl011 needs pause to be implemented in DMA controller
drivers. This also returns correct status from dwc_tx_status() in case chan is
paused.

Signed-off-by: Linus Walleij 
Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine/dw_dmac: Replace spin_lock* with irqsave variants and enable submission from callback

2011-05-13T14:10:07+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_*_bh 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.

Now, submission from callbacks are permitted as per dmaengine framework. So we
shouldn't hold any locks while calling callbacks. As locks were taken by parent
routines, so releasing them before calling callbacks doesn't look clean enough.
So, locks are taken inside all routine now, whereever they are required. And
dwc_descriptor_complete is always called without taking locks.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine/dw_dmac: Divide one sg to many desc, if sg len is greater than DWC_MAX_COUNT

2011-05-13T14:10:00+00:00

If len passed in sg for slave_sg transfers is greater than DWC_MAX_COUNT, then
driver programmes controller incorrectly.  This patch adds code to handle this
situation by allocation more than one desc for same sg.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine/dw_dmac: set residue as total len in dwc_tx_status if status is !DMA_SUCCESS

2011-05-13T14:09:55+00:00

If transfer status is !=DMA_SUCCESS, return total transfer len as residue,
instead of zero.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine/dw_dmac: don't call callback routine in case dmaengine_terminate_all() is called

2011-05-13T14:09:46+00:00

If dmaengine_terminate_all() is called for dma channel, then it doesn't make
much sense to call registered callback routine. While in case of success or
failure it must be called.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dmaengine/dw_dmac fix: dwc_scan_descriptors must compare first desc address also with llp

2011-03-31T05:37:31+00:00

dwc_scan_descriptors scans all descriptors from active_list in case transfer is
not completed.  It compares first_desc->lli.llp, and then all childrens of its
tx_list. But it doesn't compare its own address, i.e. first_desc->txd.phys, as
this is what we have initially programmed into the controller register. So this
causes dma to stop and finish a transfer, which was never started. And thus
fail.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dw_dmac: Setting Default Burst length for transfers as 16.

2011-03-06T19:42:28+00:00

This patch sets default Burst length for all transfer to 16. This will
enhance performance when user doesn't have any chan->private data.

Signed-off-by: Viresh Kumar 
Signed-off-by: Vinod Koul