[alsa-devel] [PATCH 00/18] edma/ASoC: dmaengine PCM for AM335x and AM447x

Peter Ujfalusi peter.ujfalusi at ti.com
Thu Mar 13 10:18:22 CET 2014


With this series AM335x and AM447x will use the dmaengine PCM for audio. The
daVinci devices will keep using the davinci-pcm for now since I do not have
means to test them but the code is written in a way that they can be switched
to use the edma-pcm easily (DA850/OMAP-L138 has been tested and audio was
working fine).

To be able to use the dmaengine PCM I needed to make changes to the edma code in
arch/arm/common/ and in drivers/dma/ :
Adding support for DMA pause/resume
Possibility to select non default event queue/TC for cyclic (audio) dma
channels: all devices using the eDMA via dmaengine was assigned to the default
EQ/TC (mmc, i2c, spi, etc, and audio). This is not optimal from system
performance point of view since sharing the same EQ/TC can cause latency spikes
for cyclic channels (long DMA transfers for MMC for example).

While debugging the edma to get things sorted out I noticed that the debug was
too verbose and the important information was hidden even when the we did not
asked for verbose dmaengine debug.
I have included some debug cleanups for the edma dmaengine driver also.

On the ASoC side: the series has been tested on AM335x and AM447x. I have report
that DA850/OMAP-L138 works with this series (which boots w/o DT).

Peter Ujfalusi (18):
  platform_data: edma: Be precise with the paRAM struct
  dma: edma: Add support for DMA_PAUSE/RESUME operation
  dma: edma: Set DMA_CYCLIC capability flag
  arm: common: edma: Select event queue 1 as default when booted with DT
  arm: common: edma: Save the number of event queues/TCs
  arm: common: edma: API to request non default queue for a channel
  DMA: edma: Use different eventq for cyclic channels
  dma: edma: Implement device_slave_caps callback
  dma: edma: Simplify direction configuration in edma_config_pset()
  dma: edma: Reduce debug print verbosity for non verbose debugging
  dma: edma: Prefix debug prints where the text were identical in prep
  dma: edma: Add channel number to debug prints
  dma: edma: Print the direction value as well when it is not supported
  ASoC: davinci: Add edma dmaengine platform driver
  ASoC: davinci-mcasp: Use dmaengine based platform driver for
  ASoC: davinci-mcasp: Provide correct filter_data for dmaengine for
    non-DT boot
  ASoC: davinci-mcasp: Assign the dma_data earlier in dai_probe callback
  ASoC: davinci-mcasp: Place constraint on the period size based on FIFO

 arch/arm/common/edma.c             |  34 ++++++++++++-
 drivers/dma/edma.c                 |  92 ++++++++++++++++++++++++++--------
 include/linux/platform_data/edma.h |  20 ++++----
 sound/soc/davinci/Kconfig          |   1 +
 sound/soc/davinci/Makefile         |   2 +-
 sound/soc/davinci/davinci-mcasp.c  | 100 ++++++++++++++++++++++++++++++-------
 sound/soc/davinci/edma-pcm.c       |  77 ++++++++++++++++++++++++++++
 sound/soc/davinci/edma-pcm.h       |  26 ++++++++++
 8 files changed, 303 insertions(+), 49 deletions(-)
 create mode 100644 sound/soc/davinci/edma-pcm.c
 create mode 100644 sound/soc/davinci/edma-pcm.h


More information about the Alsa-devel mailing list