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dmaengine: fsl-edma: fix eDMAv4 channel allocation issue
The eDMAv4 channel mux has a limitation where certain requests must use even channels, while others must use odd numbers. Add two flags (ARGS_EVEN_CH and ARGS_ODD_CH) to reflect this limitation. The device tree source (dts) files need to be updated accordingly. This issue was identified by the following commit: commita725990557
("arm64: dts: imx93: Fix the dmas entries order") Reverting channel orders triggered this problem. Fixes:72f5801a4e
("dmaengine: fsl-edma: integrate v3 support") Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20231114154824.3617255-2-Frank.Li@nxp.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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1 changed files with 8 additions and 0 deletions
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@ -24,6 +24,8 @@
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#define ARGS_RX BIT(0)
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#define ARGS_REMOTE BIT(1)
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#define ARGS_MULTI_FIFO BIT(2)
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#define ARGS_EVEN_CH BIT(3)
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#define ARGS_ODD_CH BIT(4)
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static void fsl_edma_synchronize(struct dma_chan *chan)
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{
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@ -157,6 +159,12 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
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fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE;
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fsl_chan->is_multi_fifo = dma_spec->args[2] & ARGS_MULTI_FIFO;
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if ((dma_spec->args[2] & ARGS_EVEN_CH) && (i & 0x1))
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continue;
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if ((dma_spec->args[2] & ARGS_ODD_CH) && !(i & 0x1))
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continue;
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if (!b_chmux && i == dma_spec->args[0]) {
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chan = dma_get_slave_channel(chan);
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chan->device->privatecnt++;
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