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[3/3] ASoC: SOF: Intel: hda-pcm: Limit the maximum number of periods by MAX_BDL_ENTRIES

Message ID 20240624121519.91703-4-pierre-louis.bossart@linux.intel.com
State New
Headers show
Series ASoC: SOF: topology/intel improvements | expand

Commit Message

Pierre-Louis Bossart June 24, 2024, 12:15 p.m. UTC 
From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

The HDaudio specification Section 3.6.2 limits the number of BDL entries to 256.

Make sure we don't allow more periods than this normative value.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/intel/hda-pcm.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c
index 9fb8521b896b..f6e24edd7adb 100644
--- a/sound/soc/sof/intel/hda-pcm.c
+++ b/sound/soc/sof/intel/hda-pcm.c
@@ -258,6 +258,12 @@  int hda_dsp_pcm_open(struct snd_sof_dev *sdev,
 	snd_pcm_hw_constraint_integer(substream->runtime,
 				      SNDRV_PCM_HW_PARAM_PERIODS);
 
+	/* Limit the maximum number of periods to not exceed the BDL entries count */
+	if (runtime->hw.periods_max > HDA_DSP_MAX_BDL_ENTRIES)
+		snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
+					     runtime->hw.periods_min,
+					     HDA_DSP_MAX_BDL_ENTRIES);
+
 	/* Only S16 and S32 supported by HDA hardware when used without DSP */
 	if (sdev->dspless_mode_selected)
 		snd_pcm_hw_constraint_mask64(substream->runtime, SNDRV_PCM_HW_PARAM_FORMAT,