On 03-08-19, 12:10, Lukas Wunner wrote: > 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. Acked-by: Vinod Koul <vkoul@xxxxxxxxxx> > > 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 -- ~Vinod
