[alsa-devel] [PATCH] ASoC: meson: axg-tdm: restrict formats depending on slot width

[Jerome Brunet]

Restrict the formats possible on the TDM interface depending on the width
of the TDM slot and let dpcm merging do the rest.

Fixes: d60e4f1e4be5 ("ASoC: meson: add tdm interface driver")
Signed-off-by: Jerome Brunet <jbrunet at baylibre.com>
---
 sound/soc/meson/axg-tdm-interface.c | 50 +++++++++++++++++------------
 1 file changed, 29 insertions(+), 21 deletions(-)

diff --git a/sound/soc/meson/axg-tdm-interface.c b/sound/soc/meson/axg-tdm-interface.c
index 7b8baf46d968..585ce030b79b 100644
--- a/sound/soc/meson/axg-tdm-interface.c
+++ b/sound/soc/meson/axg-tdm-interface.c
@@ -42,6 +42,7 @@ int axg_tdm_set_tdm_slots(struct snd_soc_dai *dai, u32 *tx_mask,
 	struct axg_tdm_stream *rx = (struct axg_tdm_stream *)
 		dai->capture_dma_data;
 	unsigned int tx_slots, rx_slots;
+	unsigned int fmt = 0;
 
 	tx_slots = axg_tdm_slots_total(tx_mask);
 	rx_slots = axg_tdm_slots_total(rx_mask);
@@ -52,38 +53,45 @@ int axg_tdm_set_tdm_slots(struct snd_soc_dai *dai, u32 *tx_mask,
 		return -EINVAL;
 	}
 
-	/*
-	 * Amend the dai driver channel number and let dpcm channel merge do
-	 * its job
-	 */
-	if (tx) {
-		tx->mask = tx_mask;
-		dai->driver->playback.channels_max = tx_slots;
-	}
-
-	if (rx) {
-		rx->mask = rx_mask;
-		dai->driver->capture.channels_max = rx_slots;
-	}
-
 	iface->slots = slots;
 
 	switch (slot_width) {
 	case 0:
-		/* defaults width to 32 if not provided */
-		iface->slot_width = 32;
-		break;
-	case 8:
-	case 16:
-	case 24:
+		slot_width = 32;
+		/* Fall-through */
 	case 32:
-		iface->slot_width = slot_width;
+		fmt |= SNDRV_PCM_FMTBIT_S32_LE;
+		/* Fall-through */
+	case 24:
+		fmt |= SNDRV_PCM_FMTBIT_S24_LE;
+		fmt |= SNDRV_PCM_FMTBIT_S20_LE;
+		/* Fall-through */
+	case 16:
+		fmt |= SNDRV_PCM_FMTBIT_S16_LE;
+		/* Fall-through */
+	case 8:
+		fmt |= SNDRV_PCM_FMTBIT_S8;
 		break;
 	default:
 		dev_err(dai->dev, "unsupported slot width: %d\n", slot_width);
 		return -EINVAL;
 	}
 
+	iface->slot_width = slot_width;
+
+	/* Amend the dai driver and let dpcm merge do its job */
+	if (tx) {
+		tx->mask = tx_mask;
+		dai->driver->playback.channels_max = tx_slots;
+		dai->driver->playback.formats = fmt;
+	}
+
+	if (rx) {
+		rx->mask = rx_mask;
+		dai->driver->capture.channels_max = rx_slots;
+		dai->driver->capture.formats = fmt;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(axg_tdm_set_tdm_slots);
-- 
2.17.1