Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Sugar Zhang <> | Subject | [PATCH v2 1/2] dmaengine: Add support for audio interleaved transfer | Date | Wed, 3 Apr 2024 21:18:22 +0800 |
| |
This patch add support for interleaved transfer which used for interleaved audio or 2d video data transfer.
for audio situation, we add 'nump' for number of period frames.
e.g. combine 2 stream into a union one by 2D dma.
DAI0: 16CH +-------------------------------------------------------------+ | Frame-1 | Frame-2 | Frame-3 | Frame-4 | ...... Frame-'numf' | +-------------------------------------------------------------+
DAI1: 16CH +-------------------------------------------------------------+ | Frame-1 | Frame-2 | Frame-3 | Frame-4 | ...... Frame-'numf' | +-------------------------------------------------------------+
DAI0 + DAI1: 32CH
+-------------------------------------------------------------+ | DAI0-F1 | DAI1-F1 | DAI0-F2 | DAI1-F2 | ...... | +-------------------------------------------------------------+ | Frame-1 | Frame-2 | ...... Frame-'numf' |
For audio situation, we have buffer_size and period_size, the 'numf' is the buffer_size. so, we need another one for period_size, e.g. 'nump'.
| Frame-1 | ~ | Frame-'nump' | ~ | Frame-'nump+1' | ~ | Frame-'numf' | |
As the above shown:
each DAI0 transfer 1 Frame, should skip a gap size (DAI1-F1) each DAI1 transfer 1 Frame, should skip a gap size (DAI0-F1)
So, the interleaved template describe as follows:
DAI0:
struct dma_interleaved_template *xt;
xt->sgl[0].size = DAI0-F1; xt->sgl[0].icg = DAI1-F1; xt->nump = nump; //the period_size in frames xt->numf = numf; //the buffer_size in frames
DAI1:
struct dma_interleaved_template *xt;
xt->sgl[0].size = DAI1-F1; xt->sgl[0].icg = DAI0-F1; xt->nump = nump; //the period_size in frames xt->numf = numf; //the buffer_size in frames
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> ---
Changes in v2: - Add the pl330 interleaved transfer
include/linux/dmaengine.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 752dbde..5263cde 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -144,6 +144,7 @@ struct data_chunk { * Otherwise, destination is filled contiguously (icg ignored). * Ignored if dst_inc is false. * @numf: Number of frames in this template. + * @nump: Number of period frames in this template. * @frame_size: Number of chunks in a frame i.e, size of sgl[]. * @sgl: Array of {chunk,icg} pairs that make up a frame. */ @@ -156,6 +157,7 @@ struct dma_interleaved_template { bool src_sgl; bool dst_sgl; size_t numf; + size_t nump; size_t frame_size; struct data_chunk sgl[]; }; -- 2.7.4
| ![\](/images/icornerr.gif) |