From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
This patchset fixes several issues:
* missing residue_granularity to allow better support for I2S
* dma-channels are artificially restricted (channel 0 and 2)
* added correct support for dma-channels 11-14 by using the correct
shared irq line
* dma-channel 12 used the "trigger for all" irq resulting in
a lockup when used
* note that care was taken so that no change to the device-tree
was necessary to avoid a break...
With this now 11 DMA channels available instead of 7 - the
additional HW-DMA-channels are:
* 0, 2 (masking of channels)
* 13, 14 (shared interrupts - see also note on channel 12)
It also adds several new features:
* slave_sg support
* dma_memcopy support
For these a consolidated method for creating standard control-block
chains was created to share common between cyclic, slave_sg and
memcopy.
Additional support for memset, memset_sg and interleave
are in the pipeline.
Testing:
* slave_sg
* spi-bcm2835:
* fb_st7735r framebuffer
* tested using mplayer
* cyclic
* bcm2835-i2s
* Audio output with a Hifiberry I2S card.
* tested using mplayer and aplay
* memcopy
* dmatest
Tests using both slave_sg and cyclic concurrently were also conducted
using mplayer to play BigBuckBunny.
To test that interrupt line sharing was working propperly the same
audio/video test was run only using dma channel 11 to 14 - these
channels are sharing the same interrupt line -
Note that the bcm2835-i2s driver that is currenlty in the kernel
fails to work since:
commit 94cb7f76caa0b337 ("Switch to using the new clock driver support")
and requires modifications to use the clock-driver framework.
For testing a quick and dirty patch had to be used - a patch to use
the clock framework is in the pipeline.
Martin Sperl (8):
dmaengine: bcm2835: set residue_granularity field
dmaengine: bcm2835: remove unnecessary masking of dma channels
dmaengine: bcm2835: use shared interrupt for channel 11 to 14.
dmaengine: bcm2835: add additional defines for DMA-registers
dmaengine: bcm2835: move cyclic member from bcm2835_chan into
bcm2835_desc
dmaengine: bcm2835: move controlblock chain generation into separate
method
dmaengine: bcm2835: add slave_sg support to bcm2835-dma
dmaengine: bcm2835: add dma_memcopy support to bcm2835-dma
drivers/dma/bcm2835-dma.c | 541 +++++++++++++++++++++++++++++++++++----------
1 file changed, 419 insertions(+), 122 deletions(-)
--
1.7.10.4
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