dma: Add max block count attribute (603cc270) · Commits · Wenxi XU / zephyr

Adds an attribute that describes the maximum number of scatter gather blocks that the DMA will accept. Useful in cases where DMA is used as the abstraction for moving data around (e.g. SoF audio streams) and variances of the hardware need to inform decisions about how to use the DMA API. Co-authored-by:

Adrian Bonislawski <adrian.bonislawski@intel.com> Co-authored-by:

Jaska Uimonen <jaska.uimonen@intel.com> Signed-off-by:

Tom Burdick <thomas.burdick@intel.com>

drivers/dma/dma_intel_adsp_gpdma.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -292,6 +292,9 @@ int intel_adsp_gpdma_get_attribute(const struct device *dev, uint32_t type, uint
		case DMA_ATTR_COPY_ALIGNMENT:
		*value = DMA_COPY_ALIGNMENT(DT_COMPAT_GET_ANY_STATUS_OKAY(intel_adsp_gpdma));
		break;
		case DMA_ATTR_MAX_BLOCK_COUNT:
		*value = CONFIG_DMA_DW_LLI_POOL_SIZE;
		break;
		default:
		return -EINVAL;
		}

drivers/dma/dma_intel_adsp_hda.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -280,6 +280,9 @@ int intel_adsp_hda_dma_get_attribute(const struct device *dev, uint32_t type, ui
		case DMA_ATTR_COPY_ALIGNMENT:
		*value = DMA_COPY_ALIGNMENT(DT_COMPAT_GET_ANY_STATUS_OKAY(intel_adsp_hda_link_out));
		break;
		case DMA_ATTR_MAX_BLOCK_COUNT:
		*value = 1;
		break;
		default:
		return -EINVAL;
		}

include/zephyr/drivers/dma.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -71,6 +71,7 @@ enum dma_attribute_type {
		DMA_ATTR_BUFFER_ADDRESS_ALIGNMENT,
		DMA_ATTR_BUFFER_SIZE_ALIGNMENT,
		DMA_ATTR_COPY_ALIGNMENT,
		DMA_ATTR_MAX_BLOCK_COUNT,
		};

		/**

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