diff options
author | Peter Ujfalusi <peter.ujfalusi@linux.intel.com> | 2024-11-07 14:15:32 +0200 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2024-11-07 13:03:36 +0000 |
commit | 1b1f491dac4f6ee88ec7c36c4fd27880b0a89f41 (patch) | |
tree | 3ad3b716fddd33bd48c656d2b8b6477460ba1b44 /sound | |
parent | 8121de33460d0f1441e75b6e52dae9317efd0656 (diff) |
ASoC: SOF: Intel: hda-stream: Always use at least two BDLE for transfers
The HDA specification states that the SDnLVI (Last Valid Index) must be at
least 1 (two BDLE entry).
Update the debug prints as well to provide better information.
While the LVI=0 worked so far without issues, it is better to align with
the specification to avoid unforeseen issues with FW loading.
Notes:
- The LVI > 0 rules is valid and honored for audio use cases
- LVI == 0 is used with software controlled (SPIB) transfers only for
firmware and library loading, which is permitted by the hardware
- This is not spelled out in the specification and it is better to avoid
cases
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://patch.msgid.link/20241107121532.3241-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-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) |