From: Lukas Wunner <lukas@wunner.de>
To: Mark Brown <broonie@kernel.org>, Vinod Koul <vkoul@kernel.org>,
Stefan Wahren <wahrenst@gmx.net>,
linux-spi@vger.kernel.org, dmaengine@vger.kernel.org,
linux-rpi-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com
Cc: Eric Anholt <eric@anholt.net>, Nuno Sa <nuno.sa@analog.com>,
Martin Sperl <kernel@martin.sperl.org>,
Noralf Tronnes <noralf@tronnes.org>,
Robert Jarzmik <robert.jarzmik@free.fr>,
Florian Kauer <florian.kauer@koalo.de>,
Florian Fainelli <f.fainelli@gmail.com>,
Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>
Subject: [PATCH 01/10] dmaengine: bcm2835: Allow reusable descriptors
Date: Sat, 3 Aug 2019 12:10:00 +0200 [thread overview]
Message-ID: <7b67f8d95154d25b3a360f580f1ca61f83f79a6f.1564825752.git.lukas@wunner.de> (raw)
In-Reply-To: <cover.1564825752.git.lukas@wunner.de>
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>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Kauer <florian.kauer@koalo.de>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
---
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
next prev parent reply other threads:[~2019-08-03 10:38 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-03 10:10 [PATCH 00/10] Raspberry Pi SPI speedups Lukas Wunner
2019-08-03 10:10 ` Lukas Wunner [this message]
2019-08-08 12:30 ` [PATCH 01/10] dmaengine: bcm2835: Allow reusable descriptors Vinod Koul
2019-08-03 10:10 ` [PATCH 04/10] spi: bcm2835: Drop dma_pending flag Lukas Wunner
2019-08-03 10:10 ` [PATCH 05/10] spi: bcm2835: Work around DONE bit erratum Lukas Wunner
2019-08-11 19:45 ` Stefan Wahren
2019-08-11 19:57 ` Lukas Wunner
2019-08-11 20:29 ` Eric Anholt
2019-08-19 19:20 ` Stefan Wahren
2019-08-03 10:10 ` [PATCH 09/10] dmaengine: bcm2835: Avoid accessing memory when copying zeroes Lukas Wunner
2019-08-08 12:31 ` Vinod Koul
2019-08-03 10:10 ` [PATCH 07/10] spi: bcm2835: Speed up TX-only DMA transfers by clearing RX FIFO Lukas Wunner
2019-08-03 10:10 ` [PATCH 06/10] spi: bcm2835: Cache CS register value for ->prepare_message() Lukas Wunner
2019-08-03 10:10 ` [PATCH 02/10] dmaengine: bcm2835: Allow cyclic transactions without interrupt Lukas Wunner
2019-08-08 12:30 ` Vinod Koul
2019-08-03 10:10 ` [PATCH 08/10] dmaengine: bcm2835: Document struct bcm2835_dmadev Lukas Wunner
2019-08-08 12:31 ` Vinod Koul
2019-08-03 10:10 ` [PATCH 10/10] spi: bcm2835: Speed up RX-only DMA transfers by zero-filling TX FIFO Lukas Wunner
2019-08-03 10:10 ` [PATCH 03/10] spi: Guarantee cacheline alignment of driver-private data Lukas Wunner
2019-09-10 11:29 ` Mark Brown
2019-08-03 16:01 ` [PATCH 00/10] Raspberry Pi SPI speedups Noralf Trønnes
2019-08-11 19:50 ` Stefan Wahren
2019-08-11 19:52 ` Lukas Wunner
2019-08-19 19:22 ` Stefan Wahren
2019-08-21 15:21 ` kernel
2019-08-24 10:33 ` Lukas Wunner
2019-09-07 9:06 ` Lukas Wunner
2019-09-09 16:56 ` Mark Brown
2019-09-10 11:21 ` Mark Brown
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