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 <nuno.sa@xxxxxxxxxx> Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx> Cc: Martin Sperl <kernel@xxxxxxxxxxxxxxxx> Cc: Florian Kauer <florian.kauer@xxxxxxxx> Cc: Robert Jarzmik <robert.jarzmik@xxxxxxx> --- drivers/dma/bcm2835-dma.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 8101ff2f05c1..523c507ad69e 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -907,6 +907,7 @@ 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); -- 2.20.1
