diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index e8df3cc341b5e07286dadaf9b99b0c4917819aa6..2fb2b914e78b4ad9ef33e606934b73629fb0ac54 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -498,6 +498,14 @@ static int stm32_sai_startup(struct snd_pcm_substream *substream,
 
 	sai->substream = substream;
 
+	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
+		snd_pcm_hw_constraint_mask64(substream->runtime,
+					     SNDRV_PCM_HW_PARAM_FORMAT,
+					     SNDRV_PCM_FMTBIT_S32_LE);
+		snd_pcm_hw_constraint_single(substream->runtime,
+					     SNDRV_PCM_HW_PARAM_CHANNELS, 2);
+	}
+
 	ret = clk_prepare_enable(sai->sai_ck);
 	if (ret < 0) {
 		dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);