Configure only the requested channel when a fixed channel is specified to avoid modifying other channels unintentionally.
Fix parameter configuration when a fixed DMA channel is requested on i.MX9 AON domain and i.MX8QM/QXP/DXL platforms. When a client requests a fixed channel (e.g., channel 6), the driver traverses channels 0-5 and may unintentionally modify their configuration if they are unused.
This leads to issues such as setting the `is_multi_fifo` flag unexpectedly, causing memcpy tests to fail when using the dmatest tool.
Only affect edma memcpy test when the channel is fixed.
Fixes: 72f5801a4e2b ("dmaengine: fsl-edma: integrate v3 support") Signed-off-by: Joy Zou joy.zou@nxp.com Cc: stable@vger.kernel.org --- drivers/dma/fsl-edma-main.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-)
diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c index 97583c7d51a2e8e7a50c7eb4f5ff0582ac95798d..f0c1a2a3fd26e663b3f0b918ff979a68af510fbf 100644 --- a/drivers/dma/fsl-edma-main.c +++ b/drivers/dma/fsl-edma-main.c @@ -317,10 +317,8 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec, return NULL; i = fsl_chan - fsl_edma->chans;
- fsl_chan->priority = dma_spec->args[1]; - fsl_chan->is_rxchan = dma_spec->args[2] & FSL_EDMA_RX; - fsl_chan->is_remote = dma_spec->args[2] & FSL_EDMA_REMOTE; - fsl_chan->is_multi_fifo = dma_spec->args[2] & FSL_EDMA_MULTI_FIFO; + if (!b_chmux && i != dma_spec->args[0]) + continue;
if ((dma_spec->args[2] & FSL_EDMA_EVEN_CH) && (i & 0x1)) continue; @@ -328,17 +326,15 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec, if ((dma_spec->args[2] & FSL_EDMA_ODD_CH) && !(i & 0x1)) continue;
- if (!b_chmux && i == dma_spec->args[0]) { - chan = dma_get_slave_channel(chan); - chan->device->privatecnt++; - return chan; - } else if (b_chmux && !fsl_chan->srcid) { - /* if controller support channel mux, choose a free channel */ - chan = dma_get_slave_channel(chan); - chan->device->privatecnt++; - fsl_chan->srcid = dma_spec->args[0]; - return chan; - } + fsl_chan->srcid = dma_spec->args[0]; + fsl_chan->priority = dma_spec->args[1]; + fsl_chan->is_rxchan = dma_spec->args[2] & FSL_EDMA_RX; + fsl_chan->is_remote = dma_spec->args[2] & FSL_EDMA_REMOTE; + fsl_chan->is_multi_fifo = dma_spec->args[2] & FSL_EDMA_MULTI_FIFO; + + chan = dma_get_slave_channel(chan); + chan->device->privatecnt++; + return chan; } return NULL; }
--- base-commit: 05af764719214d6568adb55c8749dec295228da8 change-id: 20250917-b4-edma-chanconf-da616503f29f
Best regards,