Re: [PATCH V2 3/5] dmaengine: xilinx_dma: Extend metadata handling for AXI MCDMA
From: Frank Li <Frank.li@nxp.com>
Date: 2026-03-30 15:59:05
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dmaengine, linux-devicetree, lkml
On Fri, Mar 13, 2026 at 11:55:31AM +0530, Srinivas Neeli wrote:
From: Suraj Gupta <redacted> Extend probe logic to detect AXI Stream connections for MCDMA. When an AXI Stream interface is present, metadata operations are enabled for the MCDMA channel. The xilinx_dma_get_metadata_ptr() is enhanced to retrieve metadata directly from MCDMA descriptors.
Need extra empty line between paragraph
quoted hunk ↗ jump to hunk
Add corresponding channel reference in struct xilinx_dma_tx_descriptor to retrieve associated channel. These changes ensure proper metadata handling and accurate transfer size reporting for MCDMA transfers. Signed-off-by: Suraj Gupta <redacted> Co-developed-by: Srinivas Neeli <srinivas.neeli@amd.com> Signed-off-by: Srinivas Neeli <srinivas.neeli@amd.com> --- drivers/dma/xilinx/xilinx_dma.c | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-)diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index 00200b4c2372..52203d44e7a4 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c@@ -222,6 +222,8 @@ #define XILINX_MCDMA_BD_EOP BIT(30) #define XILINX_MCDMA_BD_SOP BIT(31) +struct xilinx_dma_chan; + /** * struct xilinx_vdma_desc_hw - Hardware Descriptor * @next_desc: Next Descriptor Pointer @0x00@@ -371,6 +373,7 @@ struct xilinx_cdma_tx_segment { /** * struct xilinx_dma_tx_descriptor - Per Transaction structure + * @chan: DMA channel for which this descriptor is allocated * @async_tx: Async transaction descriptor * @segments: TX segments list * @node: Node in the channel descriptors list@@ -379,6 +382,7 @@ struct xilinx_cdma_tx_segment { * @residue: Residue of the completed descriptor */ struct xilinx_dma_tx_descriptor { + struct xilinx_dma_chan *chan;
async_tx already include dma_chan's information. Frank