Re: [alsa-devel] [PATCH 2/2] ASoC: tegra: use sound pcm library for substream dma buffer

On Mon, Jul 02, 2012 at 11:14:55AM +0200, Takashi Iwai wrote:

Laxman Dewangan wrote:

...

• if (!card->dev->dma_mask)

• card->dev->dma_mask = &tegra_dma_mask;
  

• if (!card->dev->coherent_dma_mask)

• card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  

The mask setup is still required even if you use the preallocation helper.

Though that code is at least notionally buggy anyway, it should be the DMA controller device that's used to obtain the DMA mask rather than the card device which is basically unconnected with DMA.