alsa pause command support in imx8m mini

gavintong — Mon, 16 May 2022 06:28:59 GMT

Hi all,

I had implemented a alsa sound driver with imx8m mini SDK board(using imx-5.4.70-2.3.0 sdk), when I issue a pause command using alsa api, it returns "PAUSE command ignored (no hw support)", and the i2s output seems keep sending out the last sample value.

//----from imx-pcm-dma-v2.c-------

ret = dma_get_slave_caps(chan, &dma_caps);

if (ret == 0) {

if (dma_caps.cmd_pause)

imx_pcm_hardware.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;

if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)

imx_pcm_hardware.info |= SNDRV_PCM_INFO_BATCH;

if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

addr_widths = dma_caps.dst_addr_widths;

else

addr_widths = dma_caps.src_addr_widths;

}

//-----------------------------------------------

In order to support 'SNDRV_PCM_INFO_PAUSE', the dma has to support pause cmd, but I found imx-sdma seems not implemented device-pause function.

Could anyone kindly give some suggestions?

Thanks a lot,

Gavin

topic alsa pause command support in imx8m mini in i.MX Processors

alsa pause command support in imx8m mini