dmaengine: Add flow controller information to dma_slave_config (dcc043dc) · Commits · 戴 / test

Flow controller is programmable for few controllers and there are few intelligent peripherals like, Synopsys JPEG controller, that needs to be a flow controller of DMA transfers on dest side. For this, currently two drivers, pl08x and dw_dmac, support flow controller to be passed from platform to these drivers. Perhaps, this should be a part of struct dma_slave_config. This patch adds another field device_fc to this structure. User drivers must pass this as true if they want to be flow controller of certain transfers. Signed-off-by:

Viresh Kumar <viresh.kumar@st.com> Acked-by:

Linus Walleij <linus.walleij@linaro.org> Signed-off-by:

Vinod Koul <vinod.koul@linux.intel.com>

include/linux/dmaengine.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,7 @@
		#include <linux/uio.h>
		#include <linux/scatterlist.h>
		#include <linux/bitmap.h>
		#include <linux/types.h>
		#include <asm/page.h>

		/**
		@@ -331,6 +332,9 @@ enum dma_slave_buswidth {
		* may or may not be applicable on memory sources.
		* @dst_maxburst: same as src_maxburst but for destination target
		* mutatis mutandis.
		* @device_fc: Flow Controller Settings. Only valid for slave channels. Fill
		* with 'true' if peripheral should be flow controller. Direction will be
		* selected at Runtime.
		*
		* This struct is passed in as configuration data to a DMA engine
		* in order to set up a certain channel for DMA transport at runtime.
		@@ -357,6 +361,7 @@ struct dma_slave_config {
		enum dma_slave_buswidth dst_addr_width;
		u32 src_maxburst;
		u32 dst_maxburst;
		bool device_fc;
		};

		static inline const char dma_chan_name(struct dma_chan chan)

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