On Tue, Oct 29, 2019 at 05:17:09PM +0800, Shengjiu Wang wrote:
> There are two asrc module in imx8qm, each module has different
> clock configuration, and the DMA type is EDMA.
>
> So in this patch, we define the new clocks, refine the clock map,
> and include struct fsl_asrc_soc_data for different soc usage.
>
> The EDMA channel is fixed with each dma request, one dma request
> corresponding to one dma channel. So we need to request dma
> channel with dma request of asrc module.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
> ---
> sound/soc/fsl/fsl_asrc.c | 91 +++++++++++++++++++++++++++++-------
> sound/soc/fsl/fsl_asrc.h | 65 +++++++++++++++++++++++++-
> sound/soc/fsl/fsl_asrc_dma.c | 39 ++++++++++++----
> 3 files changed, 167 insertions(+), 28 deletions(-)
> diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
> index d6146de9acd2..dbb07a486504 100644
> --- a/sound/soc/fsl/fsl_asrc_dma.c
> +++ b/sound/soc/fsl/fsl_asrc_dma.c
> @@ -199,19 +199,40 @@ static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
>
> /* Get DMA request of Back-End */
> tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
> - tmp_data = tmp_chan->private;
> - pair->dma_data.dma_request = tmp_data->dma_request;
> - dma_release_channel(tmp_chan);
> + /* tmp_chan may be NULL for it is already allocated by Back-End */
> + if (tmp_chan) {
> + tmp_data = tmp_chan->private;
> + if (tmp_data)
> + pair->dma_data.dma_request = tmp_data->dma_request;
If this patch is supposed to add a !tmp_chan case for EDMA, we
probably shouldn't mute the !tmp_data case because dma_request
will be NULL, although the code previously didn't have a check
either. I mean we might need to error-out for !tmp_chan. Or...
is this intentional?
> + dma_release_channel(tmp_chan);
> + }
>
> /* Get DMA request of Front-End */
> tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
> - tmp_data = tmp_chan->private;
> - pair->dma_data.dma_request2 = tmp_data->dma_request;
> - pair->dma_data.peripheral_type = tmp_data->peripheral_type;
> - pair->dma_data.priority = tmp_data->priority;
> - dma_release_channel(tmp_chan);
> + if (tmp_chan) {
> + tmp_data = tmp_chan->private;
> + if (tmp_data) {
Same question here.
> + pair->dma_data.dma_request2 = tmp_data->dma_request;
> + pair->dma_data.peripheral_type =
> + tmp_data->peripheral_type;
> + pair->dma_data.priority = tmp_data->priority;
> + }
> + dma_release_channel(tmp_chan);
> + }
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