diff options
| -rw-r--r-- | sound/soc/sof/intel/hda-stream.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/sound/soc/sof/intel/hda-stream.c b/sound/soc/sof/intel/hda-stream.c index 3ac63ce67ab1..519bafd3b947 100644 --- a/sound/soc/sof/intel/hda-stream.c +++ b/sound/soc/sof/intel/hda-stream.c @@ -119,13 +119,39 @@ int hda_dsp_stream_setup_bdl(struct snd_sof_dev *sdev, int remain, ioc; period_bytes = hstream->period_bytes; - dev_dbg(sdev->dev, "period_bytes:0x%x\n", period_bytes); - if (!period_bytes) + dev_dbg(sdev->dev, "period_bytes: %#x, bufsize: %#x\n", period_bytes, + hstream->bufsize); + + if (!period_bytes) { + unsigned int chunk_size; + + chunk_size = snd_sgbuf_get_chunk_size(dmab, 0, hstream->bufsize); + period_bytes = hstream->bufsize; + /* + * HDA spec demands that the LVI value must be at least one + * before the DMA operation can begin. This means that there + * must be at least two BDLE present for the transfer. + * + * If the buffer is not a single continuous area then the + * hda_setup_bdle() will create multiple BDLEs for each segment. + * If the memory is a single continuous area, force it to be + * split into two 'periods', otherwise the transfer will be + * split to multiple BDLE for each chunk in hda_setup_bdle() + * + * Note: period_bytes == 0 can only happen for firmware or + * library loading. The data size is 4K aligned, which ensures + * that the second chunk's start address will be 128-byte + * aligned. + */ + if (chunk_size == hstream->bufsize) + period_bytes /= 2; + } + periods = hstream->bufsize / period_bytes; - dev_dbg(sdev->dev, "periods:%d\n", periods); + dev_dbg(sdev->dev, "periods: %d\n", periods); remain = hstream->bufsize % period_bytes; if (remain) |