diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-05-20 18:24:19 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-05-31 09:37:39 +0530 |
| commit | 4fbf41ce573556a6dc4e684f0d92700cdc883ad3 (patch) | |
| tree | f8f61fde9b1432d713c32ac42ffa268bbe95935c /drivers/dma/xilinx | |
| parent | 30211901927a2a504adae2a75f9863962d2d06b0 (diff) | |
| download | linux-4fbf41ce573556a6dc4e684f0d92700cdc883ad3.tar.bz2 | |
dmaengine: xilinx: dpdma: Print debug message when losing vsync race
The hardware retrigger is inherently racy with the vsync interrupt. This
isn't an issue as the hardware provides a way to detect a race loss and
handle it correctly. When debugging issues related to this, it's useful
to get a notification of the race loss. Add a debug message to do so.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jianqiang Chen <jianqiang.chen@xilinx.com>
Reviewed-by: Jianqiang Chen <jianqiang.chen@xilinx.com>
Link: https://lore.kernel.org/r/20210520152420.23986-4-laurent.pinchart@ideasonboard.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/xilinx')
| -rw-r--r-- | drivers/dma/xilinx/xilinx_dpdma.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/dma/xilinx/xilinx_dpdma.c b/drivers/dma/xilinx/xilinx_dpdma.c index ea56c3b35782..5834f8614a58 100644 --- a/drivers/dma/xilinx/xilinx_dpdma.c +++ b/drivers/dma/xilinx/xilinx_dpdma.c @@ -1095,8 +1095,12 @@ static void xilinx_dpdma_chan_vsync_irq(struct xilinx_dpdma_chan *chan) /* If the retrigger raced with vsync, retry at the next frame. */ sw_desc = list_first_entry(&pending->descriptors, struct xilinx_dpdma_sw_desc, node); - if (sw_desc->hw.desc_id != desc_id) + if (sw_desc->hw.desc_id != desc_id) { + dev_dbg(chan->xdev->dev, + "chan%u: vsync race lost (%u != %u), retrying\n", + chan->id, sw_desc->hw.desc_id, desc_id); goto out; + } /* * Complete the active descriptor, if any, promote the pending |