linux-kernel - [PATCH v4 2/5] dmaengine: imx-sdma: Support 24bit/3bytes for sg mode

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Date: Fri, 29 Mar 2024 10:34:42 -0400
From: Frank Li <Frank.Li@....com>
To: Vinod Koul <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Joy Zou <joy.zou@....com>
Cc: dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 imx@...ts.linux.dev, Frank Li <Frank.Li@....com>, 
 Shengjiu Wang <shengjiu.wang@....com>, Vipul Kumar <vipul_kumar@...tor.com>, 
 Srikanth Krishnakar <Srikanth_Krishnakar@...tor.com>, 
 Robin Gong <yibin.gong@....com>, Daniel Baluta <daniel.baluta@....com>
Subject: [PATCH v4 2/5] dmaengine: imx-sdma: Support 24bit/3bytes for sg
 mode

From: Shengjiu Wang <shengjiu.wang@....com>

Update 3bytes buswidth that is supported by sdma.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
Signed-off-by: Vipul Kumar <vipul_kumar@...tor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@...tor.com>
Acked-by: Robin Gong <yibin.gong@....com>
Reviewed-by: Joy Zou <joy.zou@....com>
Reviewed-by: Daniel Baluta <daniel.baluta@....com>
Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/dma/imx-sdma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 4f1a9d1b152d6..6be4c1e441266 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -176,6 +176,7 @@
 
 #define SDMA_DMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
 
 #define SDMA_DMA_DIRECTIONS	(BIT(DMA_DEV_TO_MEM) | \
@@ -1658,6 +1659,9 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
 			if (count & 3 || sg->dma_address & 3)
 				goto err_bd_out;
 			break;
+		case DMA_SLAVE_BUSWIDTH_3_BYTES:
+			bd->mode.command = 3;
+			break;
 		case DMA_SLAVE_BUSWIDTH_2_BYTES:
 			bd->mode.command = 2;
 			if (count & 1 || sg->dma_address & 1)

-- 
2.34.1