On Fri, Jun 21, 2024 at 06:49:32PM +0800, Joy Zou wrote:
> Check src ID to detect misuse of same src ID for multiple DMA channels.
>
> Signed-off-by: Joy Zou <joy.zou@xxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/dma/fsl-edma-main.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
> index d4f29ece69f5..47939d010e59 100644
> --- a/drivers/dma/fsl-edma-main.c
> +++ b/drivers/dma/fsl-edma-main.c
> @@ -100,6 +100,22 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
> return fsl_edma_err_handler(irq, dev_id);
> }
>
> +static bool fsl_edma_srcid_in_use(struct fsl_edma_engine *fsl_edma, u32 srcid)
> +{
> + struct fsl_edma_chan *fsl_chan;
> + int i;
> +
> + for (i = 0; i < fsl_edma->n_chans; i++) {
> + fsl_chan = &fsl_edma->chans[i];
> +
> + if (fsl_chan->srcid && srcid == fsl_chan->srcid) {
> + dev_err(&fsl_chan->pdev->dev, "The srcid is using! Can't use repeatly.");
> + return true;
> + }
> + }
> + return false;
> +}
> +
> static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
> struct of_dma *ofdma)
> {
> @@ -117,6 +133,10 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
> list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
> if (chan->client_count)
> continue;
> +
> + if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[1]))
> + return NULL;
> +
> if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
> chan = dma_get_slave_channel(chan);
> if (chan) {
> @@ -161,6 +181,8 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
> continue;
>
> fsl_chan = to_fsl_edma_chan(chan);
> + if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[0]))
> + return NULL;
> i = fsl_chan - fsl_edma->chans;
>
> fsl_chan->priority = dma_spec->args[1];
> --
> 2.37.1
>
