linux-stable.git/drivers/dma/dw, branch linux-3.12.y

dmaengine: dw: convert to __ffs()

2016-03-03T11:45:56+00:00

commit 39416677b95bf1ab8bbfa229ec7e511c96ad5d0c upstream.

We replace __fls() by __ffs() since we have to find a *minimum* data width that
satisfies both source and destination.

While here, rename dwc_fast_fls() to dwc_fast_ffs() which it really is.

Fixes: 4c2d56c574db (dw_dmac: introduce dwc_fast_fls())
Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Signed-off-by: Jiri Slaby

dmaengine: dw: properly read DWC_PARAMS register

2015-10-27T09:18:25+00:00

commit 6bea0f6d1c47b07be88dfd93f013ae05fcb3d8bf upstream.

In case we have less than maximum allowed channels (8) and autoconfiguration is
enabled the DWC_PARAMS read is wrong because it uses different arithmetic to
what is needed for channel priority setup.

Re-do the caclulations properly. This now works on AVR32 board well.

Fixes: fed2574b3c9f (dw_dmac: introduce software emulation of LLP transfers)
Cc: yitian.bu@tangramtek.com
Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Signed-off-by: Jiri Slaby

dmaengine: dw: append MODULE_ALIAS for platform driver

2015-04-09T12:14:10+00:00

commit a104a45ba7a51b5b4c5e8437020d9d48edf22f89 upstream.

The commit 9cade1a46c77 (dma: dw: split driver to library part and platform
code) introduced a separate platform driver but missed to add a
MODULE_ALIAS("platform:dw_dmac"); to that module.

The patch adds this to get driver loaded automatically if platform device is
registered.

Reported-by: "Blin, Jerome" 
Fixes: 9cade1a46c77 (dma: dw: split driver to library part and platform code)
Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Signed-off-by: Jiri Slaby

dmaengine: dw: don't perform DMA when dmaengine_submit is called

2014-10-13T13:41:40+00:00

commit dd8ecfcac66b4485416b2d1df0ec4798b198d7d6 upstream.

Accordingly to discussion [1] and followed up documentation the DMA controller
driver shouldn't start any DMA operations when dmaengine_submit() is called.

This patch fixes the workflow in dw_dmac driver to follow the documentation.

[1] http://www.spinics.net/lists/arm-kernel/msg125987.html

Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Cc: "Petallo, MauriceX R" 
Signed-off-by: Jiri Slaby

dmaengine: dw: introduce dwc_dostart_first_queued() helper

2014-10-13T13:41:39+00:00

commit e7637c6c0382485f4d2e20715d058dae6f2b6a7c upstream.

We have a duplicate code which starts first descriptor in the queue. Let's make
this as a separate helper that can be used in future as well.

Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Cc: "Petallo, MauriceX R" 
Signed-off-by: Jiri Slaby

dmaengine: dw: went back to plain {request,free}_irq() calls

2014-06-09T13:53:50+00:00

commit 97977f7576a89cb9436c000ae703c0d515e748ac upstream.

The commit dbde5c29 "dw_dmac: use devm_* functions to simplify code" turns
probe function to use devm_* helpers and simultaneously brings a regression. We
need to ensure irq is disabled, followed by ensuring that don't schedule any
more tasklets and then its safe to use tasklet_kill().

The free_irq() will ensure that the irq is disabled and also wait till all
scheduled interrupts are executed by invoking synchronize_irq(). So we need to
only do tasklet_kill() after invoking free_irq().

Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul 
Signed-off-by: Jiri Slaby

Remove GENERIC_HARDIRQ config option

2013-09-13T13:09:52+00:00

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky

dma: dw: return DMA_PAUSED only if cookie status is DMA_IN_PROGRESS

2013-08-05T04:02:26+00:00

To obey a usual practice let's return DMA_PAUSED status only if
dma_cookie_status returned DMA_IN_PROGRESS.

Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul

dma: dw: return DMA_SUCCESS immediately from device_tx_status()

2013-08-05T04:02:26+00:00

There is no point to go throught the rest of the function if first call to
dma_cookie_status() returned DMA_SUCCESS.

Signed-off-by: Andy Shevchenko 
Acked-by: Viresh Kumar 
Signed-off-by: Vinod Koul

dma: dw: allow shared interrupts

2013-08-05T04:02:26+00:00

In the PC world is quite possible that devices are sharing the same interrupt
line. The patch prepares dw_dmac driver to such cases.

Signed-off-by: Andy Shevchenko 
Acked-by: Viresh Kumar 
Signed-off-by: Vinod Koul