On 06/29/2012 05:34 AM, Laxman Dewangan wrote:

Use the dmaengine based Tegra APB DMA driver for data transfer between SPI fifo and memory in place of legacy Tegra APB DMA.

Because generic soc-dmaengine-pcm uses the DMAs API based on dmaengine, using the exported APIs provided by this generic driver.

The new driver is selected if legacy driver is not selected and new dma driver is enabled through config file.

This works just fine with the existing non-dmaengine DMA driver enabled.

However, I can't get it to work with dmaengine:

# aplay ~/abba-dq-48000-stereo.wav [ 151.613476] tegra20-i2s tegra20-i2s.0: dmaengine pcm open failed with err -6 [ 151.620557] tegra20-i2s tegra20-i2s.0: can't open platform tegra20-i2s.0: -6 aplay: main:654: audio open error: No such device or address

I do have the following in my local tree: 68a67b8 ARM: tegra: add device tree AUXDATA for APBDMA 0db7a96 ARM: tegra: dma: rename driver name for clock to "tegra-apbdma"

I also fixed the compatible values in drivers/dma/tegra20-apb-dma.c so the driver would get instantiated, which it does; /sys/devices/tegra-apbdma/dma has a bunch of dmaengine channels in it.

(Note: This is on Ventana, although I doubt that makes much difference)

Is there something else I need to do to test this?