linux-kernel - [RFC v2 PATCH 0/7] Xilinx DMA enhancements and optimization

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Date:   Fri, 9 Apr 2021 23:25:58 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     <vkoul@...nel.org>, <robh+dt@...nel.org>, <michal.simek@...inx.com>
CC:     <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: [RFC v2 PATCH 0/7] Xilinx DMA enhancements and optimization


Some background about the patch series: Xilinx Axi Ethernet device driver
(xilinx_axienet_main.c) currently has axi-dma code inside it. The goal
is to refactor axiethernet driver and use existing AXI DMA driver using
DMAEngine API.

This patchset does feature addition and optimization to support
axidma integration with axiethernet network driver. Once axidma 
version is accepted mcdma specific changes will be added in 
followup version.

This series is based on dmaengine tree commit: #a38fd8748464

Changes for v2:
- Use metadata API[1] for passing metadata from dma to netdev client.
- Read irq-delay from DT.
- Remove desc_callback_valid check.
- Addressed RFC v1 comments[2].
- Minor code refactoring.

Comments, suggestions are very welcome!


[1] https://www.spinics.net/lists/dmaengine/msg16583.html
[2] https://www.spinics.net/lists/dmaengine/msg15208.html

Radhey Shyam Pandey (7):
  dt-bindings: dmaengine: xilinx_dma: Add xlnx,axistream-connected
    property
  dt-bindings: dmaengine: xilinx_dma: Add xlnx,irq-delay property
  dmaengine: xilinx_dma: Pass AXI4-Stream control words to dma client
  dmaengine: xilinx_dma: Increase AXI DMA transaction segment count
  dmaengine: xilinx_dma: Freeup active list based on descriptor
    completion bit
  dmaengine: xilinx_dma: Use tasklet_hi_schedule for timing critical
    usecase
  dmaengine: xilinx_dma: Program interrupt delay timeout

 .../devicetree/bindings/dma/xilinx/xilinx_dma.txt  |  4 ++
 drivers/dma/xilinx/xilinx_dma.c                    | 68 ++++++++++++++++++----
 2 files changed, 61 insertions(+), 11 deletions(-)

-- 
2.7.4