linux-stable.git/drivers/dma/dw, branch v3.19

dmaengine: dw: balance PM runtime calls

2015-01-13T17:37:58+00:00

In case of PCI driver we will get a warning:
	dw_dmac_pci 0000:00:18.0: Unbalanced pm_runtime_enable!
	dw_dmac_pci 0000:00:18.0: DesignWare DMA Controller, 8 channels

This happens due to pm_runtime_enable() call from the driver when PM runtime is
enabled by core.

This patch moves that call to the platform driver where it might make sense.

Fixes: bb32baf76e56 (dmaengine: dw: enable runtime PM)
Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul

dmaengine: dw: enable runtime PM

2014-11-11T22:44:19+00:00

On runtime PM aware platforms the DMA have to manage its own power state. This
patch enables runtime PM support and applies necessary calls wherever it's
needed.

Signed-off-by: Andy Shevchenko 
Acked-by: Vinod Koul 
Tested-by: Scott Ashcroft 
Signed-off-by: Rafael J. Wysocki

dmaengine: dw: export probe()/remove() and Co to users

2014-10-15T15:01:05+00:00

The driver library functions can be used directly by the compound devices such
as ADSP or serial driver where DesignWare DMA IP is privately attached to the
main hardware.

Instead of creating a new platform device leaf they may call dw_dma_probe()
with given struct dw_dma_chip directly and make sure that the main device is
DMA capable.

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

dmaengine: dw: enable and disable controller when needed

2014-10-15T15:01:05+00:00

Enable controller automatically whenever first user requires for a channel and
disable it when the last user gone.

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

dmaengine: dw: always export dw_dma_{en,dis}able

2014-10-15T15:01:04+00:00

Instead of conditional exporing of dw_dma_suspend() / dw_dma_resume() let's
export dw_dma_disable() / dw_dma_enable(). Since dw_dma_shutdown() repeats
dw_dma_disable() we may safely remove it at all.

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

dmaengine: dw: introduce dw_dma_on() helper

2014-10-15T15:01:04+00:00

As an opposite to dw_dma_off() let's introduce dw_dma_on() helper. It will be
useful later as well.

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

dmaengine: dw: split dma-dw.h to platform and private parts

2014-10-15T15:01:04+00:00

The introduced include/linux/dma/dw.h is going to contain the private
extensions and structures which are shared for dw_dmac users in the kernel.
Meanwhile include/linux/platform_data/dma-dw.h keeps only platform related data
types and definitions.

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

dmaengine: dw: move private definitions to regs.h

2014-10-15T15:01:04+00:00

Since we don't allow user to set registers directly through private slave
configuration we may move definitions to the regs.h because they are not used
anywhere except core.c part.

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

dmaengine: dw: add PCI IDs for Braswell DMAs

2014-09-11T06:18:13+00:00

Braswell SoC has two DMA controllers for LPSS. This patch adds them to
supported list in the PCI driver.

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

dmaengine: dw: move clock operations to platform.c

2014-09-11T06:18:13+00:00

On BayTrail platform DMA is not functional in the PCI mode, whereby it always
failed and exit at the point when it tries to get a clock. It causes the PCI
mode probe to exit with the error message:
	dw_dmac_pci: probe of 0000:00:1e.0 failed with error -2

This patch moves clock operations to where it belongs to. Thus, the clock is
provided only in ACPI / non-PCI cases.

Reported-by: Chew, Chiau Ee 
Signed-off-by: Andy Shevchenko 
Signed-off-by: Vinod Koul