Attachment 728073 Details for Bug 1043231

[patch] 0015-dmaengine-enable-DMA_CTRL_REUSE.patch

0015-dmaengine-enable-DMA_CTRL_REUSE.patch (text/plain), 2.11 KB, created by Matwey Kornilov on 2017-06-07 19:37:28 UTC

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Creator: Matwey Kornilov

Created: 2017-06-07 19:37:28 UTC

Size: 2.11 KB

patch

obsolete

>From 84c080d447b0ceb0043cebc21f973cf65273b730 Mon Sep 17 00:00:00 2001
>From: Robert Jarzmik <robert.jarzmik@free.fr>
>Date: Tue, 13 Oct 2015 21:54:29 +0200
>Subject: [PATCH 15/19] dmaengine: enable DMA_CTRL_REUSE
>
>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 <robert.jarzmik@free.fr>
>Signed-off-by: Vinod Koul <vinod.koul@intel.com>
>Git-commit: 9eeacd3a2f17438d9d286ff2f78c4709a4148be7
>Patch-mainline: v4.5-rc1
>Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>
>---
> 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 ec469614f80c..543a25bf5927 100644
>--- a/drivers/dma/dmaengine.c
>+++ b/drivers/dma/dmaengine.c
>@@ -497,6 +497,7 @@ 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 34bb6ee16047..bdde3deb7cd2 100644
>--- a/include/linux/dmaengine.h
>+++ b/include/linux/dmaengine.h
>@@ -704,6 +704,7 @@ struct dma_filter {
>  *	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 {
> 
>@@ -727,6 +728,7 @@ 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);
>-- 
>2.12.0
>

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