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dmaengine: axi-dmac: Enable TLAST handling

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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>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Michael Hennerich 2019-05-16 12:44:30 +03:00 committed by Vinod Koul
parent 8add6cce98
commit a3ee0bf23e
1 changed files with 2 additions and 0 deletions
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2
drivers/dma/dma-axi-dmac.c
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@ -71,6 +71,7 @@
#define AXI_DMAC_IRQ_EOT BIT(1) #define AXI_DMAC_IRQ_EOT BIT(1)
#define AXI_DMAC_FLAG_CYCLIC BIT(0) #define AXI_DMAC_FLAG_CYCLIC BIT(0)
#define AXI_DMAC_FLAG_LAST BIT(1)
/* The maximum ID allocated by the hardware is 31 */ /* The maximum ID allocated by the hardware is 31 */
#define AXI_DMAC_SG_UNUSED 32U #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 */ desc->num_submitted = 0; /* Start again */
else else
chan->next_desc = NULL; chan->next_desc = NULL;
flags |= AXI_DMAC_FLAG_LAST;
} else { } else {
chan->next_desc = desc; chan->next_desc = desc;
} }