linux-kernel - [PATCH 2/5] dmaengine: sprd: Define the DMA data width type

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Message-Id: <695931ac827adb5b2c5a7939341ff61ba00af1a1.1523346135.git.baolin.wang@linaro.org>
Date:   Tue, 10 Apr 2018 15:46:04 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     dan.j.williams@...el.com, vinod.koul@...el.com
Cc:     eric.long@...eadtrum.com, broonie@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        baolin.wang@...aro.org
Subject: [PATCH 2/5] dmaengine: sprd: Define the DMA data width type

Define the DMA data width type to make code more readable.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index af9c156..9f44d6f 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -185,6 +185,14 @@ enum sprd_dma_step {
 	SPRD_DMA_DWORD_STEP = BIT(3),
 };
 
+/* dma data width values */
+enum sprd_dma_datawidth {
+	SPRD_DMA_DATAWIDTH_1_BYTE,
+	SPRD_DMA_DATAWIDTH_2_BYTES,
+	SPRD_DMA_DATAWIDTH_4_BYTES,
+	SPRD_DMA_DATAWIDTH_8_BYTES,
+};
+
 /* dma channel hardware configuration */
 struct sprd_dma_chn_hw {
 	u32 pause;
@@ -613,15 +621,15 @@ static int sprd_dma_config(struct dma_chan *chan, struct sprd_dma_desc *sdesc,
 	u32 fix_mode = 0, fix_en = 0;
 
 	if (IS_ALIGNED(len, 4)) {
-		datawidth = 2;
+		datawidth = SPRD_DMA_DATAWIDTH_4_BYTES;
 		src_step = SPRD_DMA_WORD_STEP;
 		des_step = SPRD_DMA_WORD_STEP;
 	} else if (IS_ALIGNED(len, 2)) {
-		datawidth = 1;
+		datawidth = SPRD_DMA_DATAWIDTH_2_BYTES;
 		src_step = SPRD_DMA_SHORT_STEP;
 		des_step = SPRD_DMA_SHORT_STEP;
 	} else {
-		datawidth = 0;
+		datawidth = SPRD_DMA_DATAWIDTH_1_BYTE;
 		src_step = SPRD_DMA_BYTE_STEP;
 		des_step = SPRD_DMA_BYTE_STEP;
 	}
-- 
1.7.9.5