@@ -101,26 +101,35 @@ static int snd_imx_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_pcm_dma_params *dma_params;
- struct imx_dma_data *dma_data;
+ struct imx_dma_data *dma_data = NULL;
int ret;
snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
- if (!dma_data)
- return -ENOMEM;
+ if (dma_params->dma_client_node) {
+ ret = of_snd_dmaengine_pcm_open(substream,
+ dma_params->dma_client_node,
+ dma_params->dma_req_name);
+ if (ret)
+ return ret;
+ } else {
+ dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
+ if (!dma_data)
+ return -ENOMEM;
- dma_data->peripheral_type = dma_params->shared_peripheral ?
+ dma_data->peripheral_type = dma_params->shared_peripheral ?
IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI;
- dma_data->priority = DMA_PRIO_HIGH;
- dma_data->dma_request = dma_params->dma;
+ dma_data->priority = DMA_PRIO_HIGH;
+ dma_data->dma_request = dma_params->dma;
- ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
- if (ret) {
- kfree(dma_data);
- return ret;
+ ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
+
+ if (ret) {
+ kfree(dma_data);
+ return ret;
+ }
}
snd_dmaengine_pcm_set_data(substream, dma_data);
@@ -23,6 +23,12 @@ struct imx_pcm_dma_params {
unsigned long dma_addr;
int burstsize;
bool shared_peripheral; /* The peripheral is on SPBA bus */
+
+ /* If set, the DMA channel is requested using this devicetree node while
+ * ignoring fields 'dma' and 'shared_peripheral'. They have to be set
+ * in devicetree according to the DMA Controller devicetree bindings. */
+ struct device_node *dma_client_node;
+ const char *dma_req_name; /* DMA Request name from devicetree */
};
int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
Add support for DMA initialization using devicetree node. This patch adds two fields to imx_pcm_dma_params to pass device node information from other imx drivers to this one. If the dma_node is set, this driver tries to initialize a PCM DMA substream based on the dma_node and name. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> --- sound/soc/fsl/imx-pcm-dma.c | 31 ++++++++++++++++++++----------- sound/soc/fsl/imx-pcm.h | 6 ++++++ 2 files changed, 26 insertions(+), 11 deletions(-)