6.6-stable review patch. If anyone has any objections, please let me know.
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From: Martin Povišer povik+lin@cutebit.org
[ Upstream commit e717c661e2d1a660e96c40b0fe9933e23a1d7747 ]
We don't (and can't) configure the hardware correctly if the number of channels exceeds the weight of the TDM mask. Report that constraint in startup of FE.
Fixes: 3df5d0d97289 ("ASoC: apple: mca: Start new platform driver") Signed-off-by: Martin Povišer povik+lin@cutebit.org Signed-off-by: James Calligeros jcalligeros99@gmail.com Link: https://patch.msgid.link/20250518-mca-fixes-v1-1-ee1015a695f6@gmail.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/apple/mca.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/sound/soc/apple/mca.c b/sound/soc/apple/mca.c index ce77934f3eef3..0e96caa607fb8 100644 --- a/sound/soc/apple/mca.c +++ b/sound/soc/apple/mca.c @@ -464,6 +464,28 @@ static int mca_configure_serdes(struct mca_cluster *cl, int serdes_unit, return -EINVAL; }
+static int mca_fe_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct mca_cluster *cl = mca_dai_to_cluster(dai); + unsigned int mask, nchannels; + + if (cl->tdm_slots) { + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + mask = cl->tdm_tx_mask; + else + mask = cl->tdm_rx_mask; + + nchannels = hweight32(mask); + } else { + nchannels = 2; + } + + return snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, + 1, nchannels); +} + static int mca_fe_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) { @@ -680,6 +702,7 @@ static int mca_fe_hw_params(struct snd_pcm_substream *substream, }
static const struct snd_soc_dai_ops mca_fe_ops = { + .startup = mca_fe_startup, .set_fmt = mca_fe_set_fmt, .set_bclk_ratio = mca_set_bclk_ratio, .set_tdm_slot = mca_fe_set_tdm_slot,