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| author |   Lukas Wunner <lukas@wunner.de> | 2019-09-11 12:15:30 +0200 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2019-09-11 15:53:02 +0100 |
| commit | 6f6869dc97e8657e15d728c9a1ee3af2b9343990 (patch) | |
| tree | 9e925c8b0bf6123f39d0de3c05de9a78b4bcb36c /drivers/dma | |
| parent | dmaengine: bcm2835: Allow cyclic transactions without interrupt (diff) | |
| download | linux-dev-6f6869dc97e8657e15d728c9a1ee3af2b9343990.tar.xz linux-dev-6f6869dc97e8657e15d728c9a1ee3af2b9343990.zip | |
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 <nuno.sa@analog.com>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Kauer <florian.kauer@koalo.de>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Link: https://lore.kernel.org/r/bfc98a38225bbec4158440ad06cb9eee675e3e6f.1568187525.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/bcm2835-dma.c | 1 |
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); |