From 2690edc3b4ca721042f63fe7c25f595b8baa8360 Mon Sep 17 00:00:00 2001 From: Radhey Shyam Pandey Date: Tue, 20 Nov 2018 16:31:48 +0100 Subject: dmaengine: xilinx_dma: program hardware supported buffer length [ Upstream commit ae809690b46a71dc56cda5b3b8884c8c41a0df15 ] AXI-DMA IP supports configurable (c_sg_length_width) buffer length register width, hence read buffer length (xlnx,sg-length-width) DT property and ensure that driver doesn't program buffer length exceeding the supported limit. For VDMA and CDMA there is no change. Cc: Rob Herring Cc: Mark Rutland Cc: devicetree@vger.kernel.org Signed-off-by: Radhey Shyam Pandey Signed-off-by: Michal Simek Signed-off-by: Andrea Merello [rebase, reword] Signed-off-by: Vinod Koul Stable-dep-of: 596b53ccc36a ("dmaengine: xilinx_dma: call of_node_put() when breaking out of for_each_child_of_node()") Signed-off-by: Sasha Levin --- drivers/dma/xilinx/xilinx_dma.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index e4ea94b93400..6687cee26843 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c @@ -164,7 +164,9 @@ #define XILINX_DMA_REG_BTT 0x28 /* AXI DMA Specific Masks/Bit fields */ -#define XILINX_DMA_MAX_TRANS_LEN GENMASK(22, 0) +#define XILINX_DMA_MAX_TRANS_LEN_MIN 8 +#define XILINX_DMA_MAX_TRANS_LEN_MAX 23 +#define XILINX_DMA_V2_MAX_TRANS_LEN_MAX 26 #define XILINX_DMA_CR_COALESCE_MAX GENMASK(23, 16) #define XILINX_DMA_CR_CYCLIC_BD_EN_MASK BIT(4) #define XILINX_DMA_CR_COALESCE_SHIFT 16 @@ -2634,7 +2636,7 @@ static int xilinx_dma_probe(struct platform_device *pdev) struct xilinx_dma_device *xdev; struct device_node *child, *np = pdev->dev.of_node; struct resource *io; - u32 num_frames, addr_width; + u32 num_frames, addr_width, len_width; int i, err; /* Allocate and initialize the DMA engine structure */ @@ -2666,10 +2668,24 @@ static int xilinx_dma_probe(struct platform_device *pdev) /* Retrieve the DMA engine properties from the device tree */ xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg"); - xdev->max_buffer_len = XILINX_DMA_MAX_TRANS_LEN; + xdev->max_buffer_len = GENMASK(XILINX_DMA_MAX_TRANS_LEN_MAX - 1, 0); - if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) + if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { xdev->mcdma = of_property_read_bool(node, "xlnx,mcdma"); + if (!of_property_read_u32(node, "xlnx,sg-length-width", + &len_width)) { + if (len_width < XILINX_DMA_MAX_TRANS_LEN_MIN || + len_width > XILINX_DMA_V2_MAX_TRANS_LEN_MAX) { + dev_warn(xdev->dev, + "invalid xlnx,sg-length-width property value. Using default width\n"); + } else { + if (len_width > XILINX_DMA_MAX_TRANS_LEN_MAX) + dev_warn(xdev->dev, "Please ensure that IP supports buffer length > 23 bits\n"); + xdev->max_buffer_len = + GENMASK(len_width - 1, 0); + } + } + } if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { err = of_property_read_u32(node, "xlnx,num-fstores", -- cgit v1.2.3