linux-kernel - [PATCH 2/2] ARM: EXYNOS: support burst mode for for dev-to-mem and dev-to-mem transmit

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Date:	Tue, 19 Feb 2013 11:02:09 +0900
From:	Boojin Kim <boojin.kim@...sung.com>
To:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc:	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Russell King' <linux@....linux.org.uk>,
	'Dan Williams' <djbw@...com>,
	'Vinod Koul' <vinod.koul@...el.com>,
	'Jaswinder Singh' <jassi.brar@...sung.com>,
	'Ben Dooks' <ben-linux@...ff.org>
Subject: [PATCH 2/2] ARM: EXYNOS: support burst mode for for dev-to-mem and
 dev-to-mem transmit

This patch adds to support burst mode for for dev-to-mem and dev-to-mem transmit

Signed-off-by: Boojin Kim <boojin.kim@...sung.com>
---
 arch/arm/plat-samsung/dma-ops.c              |   10 ++++++++--
 arch/arm/plat-samsung/include/plat/dma-ops.h |    1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
index d088afa..c25e842 100644
--- a/arch/arm/plat-samsung/dma-ops.c
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -54,14 +54,20 @@ static int samsung_dmadev_config(unsigned ch,
 		slave_config.direction = param->direction;
 		slave_config.src_addr = param->fifo;
 		slave_config.src_addr_width = param->width;
-		slave_config.src_maxburst = 1;
+		if (param->maxburst)
+			slave_config.src_maxburst = param->maxburst;
+		else
+			slave_config.src_maxburst = 1;
 		dmaengine_slave_config(chan, &slave_config);
 	} else if (param->direction == DMA_MEM_TO_DEV) {
 		memset(&slave_config, 0, sizeof(struct dma_slave_config));
 		slave_config.direction = param->direction;
 		slave_config.dst_addr = param->fifo;
 		slave_config.dst_addr_width = param->width;
-		slave_config.dst_maxburst = 1;
+		if (param->maxburst)
+			slave_config.dst_maxburst = param->maxburst;
+		else
+			slave_config.dst_maxburst = 1;
 		dmaengine_slave_config(chan, &slave_config);
 	} else {
 		pr_warn("unsupported direction\n");
diff --git a/arch/arm/plat-samsung/include/plat/dma-ops.h b/arch/arm/plat-samsung/include/plat/dma-ops.h
index f5144cd..95893c7 100644
--- a/arch/arm/plat-samsung/include/plat/dma-ops.h
+++ b/arch/arm/plat-samsung/include/plat/dma-ops.h
@@ -35,6 +35,7 @@ struct samsung_dma_prep {
 struct samsung_dma_config {
 	enum dma_transfer_direction direction;
 	enum dma_slave_buswidth width;
+	u32 maxburst;
 	dma_addr_t fifo;
 };

--
1.7.5.4



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