[PATCH V2 2/5] dmaengine: xilinx_dma: Move descriptors to done list based on completion bit
From: Srinivas Neeli <srinivas.neeli@amd.com>
Date: 2026-03-13 06:25:54
Also in:
dmaengine, linux-devicetree, lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
In AXIMCDMA scatter-gather mode, the hardware sets the completion bit when a transfer finishes. The driver now checks this bit to free descriptors from the active list and move them to the done list. This is required when interrupt delay timeout Dly_IrqEn is enabled, as interrupts may be triggered before the configured threshold is reached, even if not all descriptors have completed. Signed-off-by: Srinivas Neeli <srinivas.neeli@amd.com> --- drivers/dma/xilinx/xilinx_dma.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 4a83492f2435..00200b4c2372 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c@@ -1762,6 +1762,18 @@ static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan) struct xilinx_axidma_tx_segment, node); if (!(seg->hw.status & XILINX_DMA_BD_COMP_MASK) && chan->has_sg) break; + } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { + struct xilinx_aximcdma_tx_segment *seg; + bool completed; + + seg = list_last_entry(&desc->segments, + struct xilinx_aximcdma_tx_segment, + node); + completed = (chan->direction == DMA_DEV_TO_MEM) ? + (seg->hw.s2mm_status & XILINX_DMA_BD_COMP_MASK) : + (seg->hw.mm2s_status & XILINX_DMA_BD_COMP_MASK); + if (!completed) + break; } if (chan->has_sg && chan->xdev->dma_config->dmatype != XDMA_TYPE_VDMA)
--
2.43.0