From mboxrd@z Thu Jan 1 00:00:00 1970 From: robert.jarzmik@free.fr (Robert Jarzmik) Date: Tue, 13 Oct 2015 21:54:29 +0200 Subject: [PATCH v2 2/3] dmaengine: enable DMA_CTRL_REUSE In-Reply-To: <1444766070-26915-1-git-send-email-robert.jarzmik@free.fr> References: <1444766070-26915-1-git-send-email-robert.jarzmik@free.fr> Message-ID: <1444766070-26915-2-git-send-email-robert.jarzmik@free.fr> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org In the current state, the capability of transfer reuse can neither be set by a slave dmaengine driver, nor used by a client driver, because the capability is not available to dma_get_slave_caps(). Fix this by adding a way to declare the capability. Fixes: 272420214d26 ("dmaengine: Add DMA_CTRL_REUSE") Signed-off-by: Robert Jarzmik --- drivers/dma/dmaengine.c | 1 + include/linux/dmaengine.h | 2 ++ 2 files changed, 3 insertions(+) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 09479d4be4db..0d64dc8627a8 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -493,6 +493,7 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) caps->dst_addr_widths = device->dst_addr_widths; caps->directions = device->directions; caps->residue_granularity = device->residue_granularity; + caps->descriptor_reuse = device->descriptor_reuse; /* * Some devices implement only pause (e.g. to get residuum) but no diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 7ea9184eaa13..2fd8344f219b 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -658,6 +658,7 @@ enum dmaengine_alignment { * struct with auxiliary transfer status information, otherwise the call * will just return a simple status code * @device_issue_pending: push pending transactions to hardware + * @descriptor_reuse: a submitted transfer can be resubmitted after completion */ struct dma_device { @@ -680,6 +681,7 @@ struct dma_device { u32 src_addr_widths; u32 dst_addr_widths; u32 directions; + bool descriptor_reuse; enum dma_residue_granularity residue_granularity; int (*device_alloc_chan_resources)(struct dma_chan *chan); -- 2.1.4