[alsa-devel] [PATCH 1/3] ASoC: amd: use DMA addr rather than CPU pa for audio buffer

[Mark Brown]

On Mon, Jul 29, 2019 at 05:38:29PM +0530, Ravulapati Vishnu vardhan rao wrote:
> We shouldn't assume CPU physical address we get from page_to_phys()
> is same as DMA address we get from dma_alloc_coherent(). On x86_64,
> we won't run into any problem with the assumption when dma_ops is
> nommu_dma_ops. However, DMA address is IOVA when IOMMU is enabled.
> And it's most likely different from CPU physical address when AMD
> IOMMU is not in passthrough mode.

This doesn't build for me:

sound/soc/amd/raven/acp3x-pcm-dma.c: In function ‘acp3x_dma_hw_params’:
sound/soc/amd/raven/acp3x-pcm-dma.c:356:2: error: ‘pg’ undeclared (first use in this function)
  pg = virt_to_page(substream->dma_buffer.area);
  ^~
sound/soc/amd/raven/acp3x-pcm-dma.c:356:2: note: each undeclared identifier is reported only once for each function it appears in

Please check and resend.
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