Handle the IIO_BUFFER_DMABUF_CYCLIC flag to support cyclic buffers.
Signed-off-by: Paul Cercueil paul@crapouillou.net Reviewed-by: Alexandru Ardelean ardeleanalex@gmail.com --- drivers/iio/buffer/industrialio-buffer-dma.c | 1 + .../iio/buffer/industrialio-buffer-dmaengine.c | 15 ++++++++++++--- include/linux/iio/buffer-dma.h | 3 +++ 3 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/buffer/industrialio-buffer-dma.c b/drivers/iio/buffer/industrialio-buffer-dma.c index b9c3b01c5ea0..6185af2f33f0 100644 --- a/drivers/iio/buffer/industrialio-buffer-dma.c +++ b/drivers/iio/buffer/industrialio-buffer-dma.c @@ -901,6 +901,7 @@ int iio_dma_buffer_enqueue_dmabuf(struct iio_buffer *buffer, }
dma_block->bytes_used = iio_dmabuf->bytes_used ?: dma_block->size; + dma_block->cyclic = iio_dmabuf->flags & IIO_BUFFER_DMABUF_CYCLIC;
switch (dma_block->state) { case IIO_BLOCK_STATE_QUEUED: diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c index 57a8b2e4ba3c..952e2160a11e 100644 --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c @@ -81,9 +81,18 @@ static int iio_dmaengine_buffer_submit_block(struct iio_dma_buffer_queue *queue, if (!block->bytes_used || block->bytes_used > max_size) return -EINVAL;
- desc = dmaengine_prep_slave_single(dmaengine_buffer->chan, - block->phys_addr, block->bytes_used, dma_dir, - DMA_PREP_INTERRUPT); + if (block->cyclic) { + desc = dmaengine_prep_dma_cyclic(dmaengine_buffer->chan, + block->phys_addr, + block->size, + block->bytes_used, + dma_dir, 0); + } else { + desc = dmaengine_prep_slave_single(dmaengine_buffer->chan, + block->phys_addr, + block->bytes_used, dma_dir, + DMA_PREP_INTERRUPT); + } if (!desc) return -ENOMEM;
diff --git a/include/linux/iio/buffer-dma.h b/include/linux/iio/buffer-dma.h index 5bd687132355..3a5d9169e573 100644 --- a/include/linux/iio/buffer-dma.h +++ b/include/linux/iio/buffer-dma.h @@ -40,6 +40,7 @@ enum iio_block_state { * @phys_addr: Physical address of the blocks memory * @queue: Parent DMA buffer queue * @state: Current state of the block + * @cyclic: True if this is a cyclic buffer * @fileio: True if this buffer is used for fileio mode * @dmabuf: Underlying DMABUF object */ @@ -63,6 +64,8 @@ struct iio_dma_buffer_block { */ enum iio_block_state state;
+ bool cyclic; + bool fileio; struct dma_buf *dmabuf; };