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30 lines
1.1 KiB
Diff
30 lines
1.1 KiB
Diff
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From 59a8855b51c1d8acf37d3c80f34782d71f474617 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 13 Nov 2024 10:37:22 +0000
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Subject: [PATCH] dmaengine: dw-axi-dmac: Only start idle channels
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Attempting to start a non-idle channel causes an error message to be
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logged, and is inefficient. Test for emptiness of the desc_issued list
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before doing so.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
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+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
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@@ -536,9 +536,11 @@ static void dma_chan_issue_pending(struc
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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unsigned long flags;
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+ bool was_empty;
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spin_lock_irqsave(&chan->vc.lock, flags);
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- if (vchan_issue_pending(&chan->vc))
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+ was_empty = list_empty(&chan->vc.desc_issued);
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+ if (vchan_issue_pending(&chan->vc) && was_empty)
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axi_chan_start_first_queued(chan);
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spin_unlock_irqrestore(&chan->vc.lock, flags);
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}
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