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From: Sasha Levin <>
Cc: Alexandru Ardelean <>,
	Vinod Koul <>, Sasha Levin <>,
Subject: [PATCH AUTOSEL 4.4 080/174] dmaengine: axi-dmac: Don't check the number of frames for alignment
Date: Thu, 16 Jan 2020 12:41:17 -0500
Message-ID: <> (raw)
In-Reply-To: <>

From: Alexandru Ardelean <>

[ Upstream commit 648865a79d8ee3d1aa64aab5eb2a9d12eeed14f9 ]

In 2D transfers (for the AXI DMAC), the number of frames (numf) represents
Y_LENGTH, and the length of a frame is X_LENGTH. 2D transfers are useful
for video transfers where screen resolutions ( X * Y ) are typically
aligned for X, but not for Y.

There is no requirement for Y_LENGTH to be aligned to the bus-width (or
anything), and this is also true for AXI DMAC.

Checking the Y_LENGTH for alignment causes false errors when initiating DMA
transfers. This change fixes this by checking only that the Y_LENGTH is

Fixes: 0e3b67b348b8 ("dmaengine: Add support for the Analog Devices AXI-DMAC DMA controller")
Signed-off-by: Alexandru Ardelean <>
Signed-off-by: Vinod Koul <>
Signed-off-by: Sasha Levin <>
 drivers/dma/dma-axi-dmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 5b2395e7e04d..6de3d2142c7d 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -441,7 +441,7 @@ static struct dma_async_tx_descriptor *axi_dmac_prep_interleaved(
 	if (chan->hw_2d) {
 		if (!axi_dmac_check_len(chan, xt->sgl[0].size) ||
-		    !axi_dmac_check_len(chan, xt->numf))
+		    xt->numf == 0)
 			return NULL;
 		if (xt->sgl[0].size + dst_icg > chan->max_length ||
 		    xt->sgl[0].size + src_icg > chan->max_length)

       reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2020-01-16 17:41 ` Sasha Levin [this message]
2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 124/174] dmaengine: dw: platform: Switch to acpi_dma_controller_register() Sasha Levin
2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 149/174] dmaengine: imx-sdma: fix size check for sdma script_number Sasha Levin
2020-01-16 17:42 ` [PATCH AUTOSEL 4.4 171/174] dmaengine: ti: edma: fix missed failure handling Sasha Levin

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