[ Upstream commit
dc51b4442dd94ab12c146c1897bbdb40e16d5636 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
#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)
{
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++;