[PATCH] dmaengine: axi-dmac: Enable TLAST handling

[PATCH] dmaengine: axi-dmac: Enable TLAST handling

[Alexandru Ardelean]

From: Michael Hennerich <michael.hennerich@analog.com>

The TLAST flag is used by the DMAC HDL controller to signal to the
controller that the following segment (to be submitted) is the last one (in
a series of segments).

A receiver DMA (typically another DMAC) can read this parameter (from the
transfer), and terminate the transfer earlier. A typical use-case for this,
is when the receiver expects a certain amount of segments, but for some
reason (e.g. an ADC capture which can have an unknown number of digital
samples) the number of actual segments is smaller. The receiver would read
this flag, and then the DMAC would finish.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/dma/dma-axi-dmac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index f32fdf21edbd..8b6fc21bdb9e 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -71,6 +71,7 @@
 #define AXI_DMAC_IRQ_EOT		BIT(1)
 
 #define AXI_DMAC_FLAG_CYCLIC		BIT(0)
+#define AXI_DMAC_FLAG_LAST		BIT(1)
 
 /* The maximum ID allocated by the hardware is 31 */
 #define AXI_DMAC_SG_UNUSED 32U
@@ -216,6 +217,7 @@ static void axi_dmac_start_transfer(struct axi_dmac_chan *chan)
 			desc->num_submitted = 0; /* Start again */
 		else
 			chan->next_desc = NULL;
+		flags |= AXI_DMAC_FLAG_LAST;
 	} else {
 		chan->next_desc = desc;
 	}
-- 
2.17.1

Re: [PATCH] dmaengine: axi-dmac: Enable TLAST handling

[Vinod Koul]

On 16-05-19, 12:44, Alexandru Ardelean wrote:
> From: Michael Hennerich <michael.hennerich@analog.com>
> 
> The TLAST flag is used by the DMAC HDL controller to signal to the
> controller that the following segment (to be submitted) is the last one (in
> a series of segments).
> 
> A receiver DMA (typically another DMAC) can read this parameter (from the
> transfer), and terminate the transfer earlier. A typical use-case for this,
> is when the receiver expects a certain amount of segments, but for some
> reason (e.g. an ADC capture which can have an unknown number of digital
> samples) the number of actual segments is smaller. The receiver would read
> this flag, and then the DMAC would finish.

Applied, thanks

-- 
~Vinod