[PATCH v2] ASoC: spacemit: advertise only DMA-backed DAI streams

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

The static DAI template initializes both playback and capture stream
capabilities before dma-names is examined. As a result,
snd_soc_dai_stream_valid() considers both directions valid even when the
device only provides a single DMA channel.

Move the playback and capture capability initialization into
spacemit_i2s_init_dai(), where it is performed only for the stream
directions backed by a corresponding DMA channel. This preserves the
existing capabilities for devices with both "tx" and "rx" DMA channels,
while preventing unsupported stream directions from being advertised.

Initialize rate_min and rate_max together with the other stream
capabilities to preserve the existing rate constraints.

Fixes: fce217449075 ("ASoC: spacemit: add i2s support for K1 SoC")
Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---

Changes in v2:
 - Update the commit message to describe the functional fix as 
   suggested by Troy.

Link v1 : 
  https://lore.kernel.org/all/20260804043036.22065-1-phucduc.bui@gmail.com/

 sound/soc/spacemit/k1_i2s.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/sound/soc/spacemit/k1_i2s.c b/sound/soc/spacemit/k1_i2s.c
index 2d5ea1fd5d49..28a762769253 100644
--- a/sound/soc/spacemit/k1_i2s.c
+++ b/sound/soc/spacemit/k1_i2s.c
@@ -354,22 +354,6 @@ static const struct snd_soc_dai_ops spacemit_i2s_dai_ops = {
 
 static struct snd_soc_dai_driver spacemit_i2s_dai = {
 	.ops = &spacemit_i2s_dai_ops,
-	.playback = {
-		.channels_min = 1,
-		.channels_max = 2,
-		.rates = SPACEMIT_PCM_RATES,
-		.rate_min = SNDRV_PCM_RATE_8000,
-		.rate_max = SNDRV_PCM_RATE_48000,
-		.formats = SPACEMIT_PCM_FORMATS,
-	},
-	.capture = {
-		.channels_min = 1,
-		.channels_max = 2,
-		.rates = SPACEMIT_PCM_RATES,
-		.rate_min = SNDRV_PCM_RATE_8000,
-		.rate_max = SNDRV_PCM_RATE_48000,
-		.formats = SPACEMIT_PCM_FORMATS,
-	},
 	.symmetric_rate = 1,
 };
 
@@ -399,6 +383,8 @@ static int spacemit_i2s_init_dai(struct spacemit_i2s_dev *i2s,
 		dai->playback.channels_min = 1;
 		dai->playback.channels_max = 2;
 		dai->playback.rates = SPACEMIT_PCM_RATES;
+		dai->playback.rate_min = SNDRV_PCM_RATE_8000;
+		dai->playback.rate_max = SNDRV_PCM_RATE_48000;
 		dai->playback.formats = SPACEMIT_PCM_FORMATS;
 
 		i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
@@ -411,6 +397,8 @@ static int spacemit_i2s_init_dai(struct spacemit_i2s_dev *i2s,
 		dai->capture.channels_min = 1;
 		dai->capture.channels_max = 2;
 		dai->capture.rates = SPACEMIT_PCM_RATES;
+		dai->capture.rate_min = SNDRV_PCM_RATE_8000;
+		dai->capture.rate_max = SNDRV_PCM_RATE_48000;
 		dai->capture.formats = SPACEMIT_PCM_FORMATS;
 
 		i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-- 
2.43.0