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dmaengine: bcm2835: Allow reusable descriptors

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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]>
This commit is contained in:
Lukas Wunner 2019-09-11 12:15:30 +02:00 • committed by Mark Brown
commit 6f6869dc97
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1
drivers/dma/bcm2835-dma.c
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@ -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);