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| author | Frank Li <Frank.Li@nxp.com> | 2023-11-14 16:48:21 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-12-21 17:11:06 +0100 |
| commit | dc51b4442dd94ab12c146c1897bbdb40e16d5636 (patch) | |
| tree | 7ec38f8d7504e65054e246ec0e07dfad28e3c56d /drivers | |
| parent | dmaengine: axi-dmac: Improve cyclic DMA transfers in SG mode (diff) | |
| download | linux-dc51b4442dd94ab12c146c1897bbdb40e16d5636.tar.xz linux-dc51b4442dd94ab12c146c1897bbdb40e16d5636.zip | |
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:
commit a725990557e7 ("arm64: dts: imx93: Fix the dmas entries order")
Reverting channel orders triggered this problem.
Fixes: 72f5801a4e2b ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/fsl-edma-main.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c index 4635e16d7705..3ee08f390f81 100644 --- a/drivers/dma/fsl-edma-main.c +++ b/drivers/dma/fsl-edma-main.c @@ -24,6 +24,8 @@ #define ARGS_RX BIT(0) #define ARGS_REMOTE BIT(1) #define ARGS_MULTI_FIFO BIT(2) +#define ARGS_EVEN_CH BIT(3) +#define ARGS_ODD_CH BIT(4) static void fsl_edma_synchronize(struct dma_chan *chan) { @@ -157,6 +159,12 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec, fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE; fsl_chan->is_multi_fifo = dma_spec->args[2] & ARGS_MULTI_FIFO; + if ((dma_spec->args[2] & ARGS_EVEN_CH) && (i & 0x1)) + continue; + + if ((dma_spec->args[2] & ARGS_ODD_CH) && !(i & 0x1)) + continue; + if (!b_chmux && i == dma_spec->args[0]) { chan = dma_get_slave_channel(chan); chan->device->privatecnt++; |