aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLukas Wunner <[email protected]>2019-09-11 12:15:30 +0200
committerMark Brown <[email protected]>2019-09-11 15:53:02 +0100
commit6f6869dc97e8657e15d728c9a1ee3af2b9343990 (patch)
tree9e925c8b0bf6123f39d0de3c05de9a78b4bcb36c
parent4f2228cce2816e46dcac0be50a259a0311a90252 (diff)
dmaengine: bcm2835: Allow reusable descriptors
The DMA engine API requires DMA drivers to explicitly allow that descriptors are prepared once and reused multiple times. Only a single driver makes use of this functionality so far (pxa_dma.c, to speed up pxa_camera.c). We're about to add another use case for reusable descriptors in the BCM2835 SPI driver, so allow that in the BCM2835 DMA driver. Tested-by: Nuno Sá <[email protected]> Tested-by: Noralf Trønnes <[email protected]> Signed-off-by: Lukas Wunner <[email protected]> Acked-by: Vinod Koul <[email protected]> Acked-by: Stefan Wahren <[email protected]> Acked-by: Martin Sperl <[email protected]> Cc: Florian Kauer <[email protected]> Cc: Robert Jarzmik <[email protected]> Link: https://lore.kernel.org/r/bfc98a38225bbec4158440ad06cb9eee675e3e6f.1568187525.git.lukas@wunner.de Signed-off-by: Mark Brown <[email protected]>
-rw-r--r--drivers/dma/bcm2835-dma.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index b40fb555b98b..a65514fcb7f2 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -915,6 +915,7 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
BIT(DMA_MEM_TO_MEM);
od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+ od->ddev.descriptor_reuse = true;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);