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authorLukas Wunner <lukas@wunner.de>2019-09-11 12:15:30 +0200
committerMark Brown <broonie@kernel.org>2019-09-11 16:53:02 +0200
commit6f6869dc97e8657e15d728c9a1ee3af2b9343990 (patch)
tree9e925c8b0bf6123f39d0de3c05de9a78b4bcb36c /drivers/dma/bcm2835-dma.c
parentdmaengine: bcm2835: Allow cyclic transactions without interrupt (diff)
downloadlinux-6f6869dc97e8657e15d728c9a1ee3af2b9343990.tar.xz
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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 '')
-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);