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charset="utf-8" When using ASRC in DPCM mode, the backend DAI (codec) may have channel constraints that differ from the frontend. For example, the ASRC can support 1-8 channels, but the codec might only support stereo (2 channels). Without dpcm_merged_chan, userspace can open the frontend with unsupported channel counts, leading to errors when the backend is configured. Enable dpcm_merged_chan to merge backend channel constraints to the frontend, ensuring userspace only sees valid channel configurations. This fixes issues where applications attempt to use channel counts that the backend codec doesn't support. Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl-asoc-card.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index 70a6159430ed..41cd2fc2ea56 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -989,6 +989,7 @@ static int fsl_asoc_card_probe(struct platform_device *= pdev) =20 if (asrc_pdev) { /* DPCM DAI Links only if ASRC exists */ + priv->dai_link[1].dpcm_merged_chan =3D 1; priv->dai_link[1].cpus->of_node =3D asrc_np; priv->dai_link[1].platforms->of_node =3D asrc_np; for_each_link_codecs((&(priv->dai_link[2])), codec_idx, codec_comp) { --=20 2.34.1 From nobody Fri Jun 19 09:07:17 2026 Received: from GVXPR05CU001.outbound.protection.outlook.com (mail-swedencentralazon11013044.outbound.protection.outlook.com [52.101.83.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F8B03815C5; 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Received: from AM0PR04MB7044.eurprd04.prod.outlook.com (2603:10a6:208:191::20) by PAXPR04MB9075.eurprd04.prod.outlook.com (2603:10a6:102:229::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9846.18; Fri, 24 Apr 2026 10:36:07 +0000 Received: from AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b]) by AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b%4]) with mapi id 15.20.9846.021; Fri, 24 Apr 2026 10:36:07 +0000 From: Shengjiu Wang To: shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, linux-sound@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/5] ASoC: fsl-asoc-card: enable ignore_pmdown_time for ASRC case Date: Fri, 24 Apr 2026 18:38:03 +0800 Message-Id: <20260424103806.2276780-3-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20260424103806.2276780-1-shengjiu.wang@nxp.com> References: <20260424103806.2276780-1-shengjiu.wang@nxp.com> Content-Type: text/plain; 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Scenario: 1. Play on hw:0,1 (ASRC): ASRC-Playback =E2=86=92 CPU-Playback =E2=86=92 Co= dec 2. Stop playback 3. Play on hw:0,0 (Direct): CPU-Playback =E2=86=92 Codec 4. After 5s: No sound (DAPM powered down CPU-Playback) Root Cause: DAPM sees ASRC-Playback disconnected and powers down the entire path including CPU-Playback, even though CPU-Playback is still needed for the direct path. Solution: Enable ignore_pmdown_time for DPCM links to prevent premature widget power-down when switching between paths. Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl-asoc-card.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index 41cd2fc2ea56..e08e135886f7 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -990,6 +990,7 @@ static int fsl_asoc_card_probe(struct platform_device *= pdev) if (asrc_pdev) { /* DPCM DAI Links only if ASRC exists */ priv->dai_link[1].dpcm_merged_chan =3D 1; + priv->dai_link[1].ignore_pmdown_time =3D 1; priv->dai_link[1].cpus->of_node =3D asrc_np; priv->dai_link[1].platforms->of_node =3D asrc_np; for_each_link_codecs((&(priv->dai_link[2])), codec_idx, codec_comp) { @@ -999,6 +1000,7 @@ static int fsl_asoc_card_probe(struct platform_device = *pdev) } priv->dai_link[2].cpus->of_node =3D cpu_np; priv->dai_link[2].dai_fmt =3D priv->dai_fmt; + priv->dai_link[2].ignore_pmdown_time =3D 1; priv->card.num_links =3D 3; =20 ret =3D of_property_read_u32(asrc_np, "fsl,asrc-rate", --=20 2.34.1 From nobody Fri Jun 19 09:07:17 2026 Received: from GVXPR05CU001.outbound.protection.outlook.com (mail-swedencentralazon11013044.outbound.protection.outlook.com [52.101.83.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7DD3837F8BA; 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charset="utf-8" The CS42888 codec has 4 I2S lanes with 2 channels per lane. Using odd channel counts (3, 5, 7) causes data misalignment in the I2S frame, resulting in incorrect channel mapping. Only mono and even channel counts (1, 2, 4, 6, 8) work correctly. Additionally, the fixed system clock on i.MX platforms limits supported sample rates. With 12.288 MHz MCLK, only 48kHz family rates (48k, 96k, 192k) achieve valid MCLK:LRCK ratios. With 11.2896 MHz MCLK, only 44k family rates are supported. Add a startup callback to apply PCM constraints for both channels and rates, preventing userspace from requesting unsupported configurations. Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl-asoc-card.c | 67 +++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index e08e135886f7..50d7a5f2d79e 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -40,6 +40,18 @@ /* Default DAI format without Master and Slave flag */ #define DAI_FMT_BASE (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF) =20 +static const u32 cs42888_rates_48k[] =3D { + 48000, 96000, 192000, +}; + +static const u32 cs42888_rates_44k[] =3D { + 44100, 88200, 176400, +}; + +static const u32 cs42888_channels[] =3D { + 1, 2, 4, 6, 8, +}; + /** * struct codec_priv - CODEC private data * @mclk: Main clock of the CODEC @@ -93,6 +105,10 @@ struct cpu_priv { * @asrc_rate: ASRC sample rate used by Back-Ends * @asrc_format: ASRC sample format used by Back-Ends * @dai_fmt: DAI format between CPU and CODEC + * @support_rates: array of supported rates + * @support_channels: array of supported channels + * @num_rates: Number of entries in support_rates array + * @num_channels: Number of entries in support_channels array * @name: Card name */ =20 @@ -110,6 +126,10 @@ struct fsl_asoc_card_priv { u32 asrc_rate; snd_pcm_format_t asrc_format; u32 dai_fmt; + const u32 *support_rates; + const u32 *support_channels; + u32 num_rates; + u32 num_channels; char name[32]; }; =20 @@ -291,7 +311,41 @@ static int fsl_asoc_card_hw_free(struct snd_pcm_substr= eam *substream) return 0; } =20 +static int fsl_asoc_card_startup(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd =3D substream->private_data; + struct fsl_asoc_card_priv *priv =3D snd_soc_card_get_drvdata(rtd->card); + struct snd_pcm_runtime *runtime =3D substream->runtime; + static struct snd_pcm_hw_constraint_list constraint_rates; + static struct snd_pcm_hw_constraint_list constraint_channels; + int ret; + + constraint_channels.list =3D priv->support_channels; + constraint_channels.count =3D priv->num_channels; + constraint_rates.list =3D priv->support_rates; + constraint_rates.count =3D priv->num_rates; + + if (constraint_channels.count) { + ret =3D snd_pcm_hw_constraint_list(runtime, 0, + SNDRV_PCM_HW_PARAM_CHANNELS, + &constraint_channels); + if (ret) + return ret; + } + + if (constraint_rates.count) { + ret =3D snd_pcm_hw_constraint_list(runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + &constraint_rates); + if (ret) + return ret; + } + + return 0; +} + static const struct snd_soc_ops fsl_asoc_card_ops =3D { + .startup =3D fsl_asoc_card_startup, .hw_params =3D fsl_asoc_card_hw_params, .hw_free =3D fsl_asoc_card_hw_free, }; @@ -753,6 +807,19 @@ static int fsl_asoc_card_probe(struct platform_device = *pdev) priv->cpu_priv.sysclk_dir[RX] =3D SND_SOC_CLOCK_OUT; priv->cpu_priv.slot_width =3D 32; priv->dai_fmt |=3D SND_SOC_DAIFMT_CBC_CFC; + priv->support_channels =3D cs42888_channels; + priv->num_channels =3D ARRAY_SIZE(cs42888_channels); + if (priv->codec_priv[0].mclk_freq % 12288000 =3D=3D 0) { + priv->support_rates =3D cs42888_rates_48k; + priv->num_rates =3D ARRAY_SIZE(cs42888_rates_48k); + } else if (priv->codec_priv[0].mclk_freq % 11289600 =3D=3D 0) { + priv->support_rates =3D cs42888_rates_44k; + priv->num_rates =3D ARRAY_SIZE(cs42888_rates_44k); 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charset="utf-8" The S20_3LE format (20-bit samples in 3 bytes) requires bit clock frequencies that cannot be generated by i.MX SAI/ESAI hardware. SAI/ESAI derive BCLK from MCLK using integer dividers only. S20_3LE requires non-integer divider ratios with standard MCLK frequencies. For example, 48kHz stereo needs 1.920 MHz BCLK, which requires a divider of 6.4 from 12.288 MHz MCLK (not an integer). Add a format constraint to exclude S20_3LE, preventing clock configuration failures. Users should use S16_LE, S24_LE, or S32_LE instead. Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl-asoc-card.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index 50d7a5f2d79e..36c789f15582 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -320,6 +320,16 @@ static int fsl_asoc_card_startup(struct snd_pcm_substr= eam *substream) static struct snd_pcm_hw_constraint_list constraint_channels; int ret; =20 + /* + * Remove S20_3LE as the clock (sysclk, bclk) can't be acquired + * due to non-integer divider ratios. + */ + ret =3D snd_pcm_hw_constraint_mask64(runtime, + SNDRV_PCM_HW_PARAM_FORMAT, + ~SNDRV_PCM_FMTBIT_S20_3LE); + if (ret) + return ret; + constraint_channels.list =3D priv->support_channels; constraint_channels.count =3D priv->num_channels; constraint_rates.list =3D priv->support_rates; --=20 2.34.1 From nobody Fri Jun 19 09:07:17 2026 Received: from GVXPR05CU001.outbound.protection.outlook.com (mail-swedencentralazon11013044.outbound.protection.outlook.com [52.101.83.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 925DD389E02; 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Received: from AM0PR04MB7044.eurprd04.prod.outlook.com (2603:10a6:208:191::20) by PAXPR04MB9075.eurprd04.prod.outlook.com (2603:10a6:102:229::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9846.18; Fri, 24 Apr 2026 10:36:18 +0000 Received: from AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b]) by AM0PR04MB7044.eurprd04.prod.outlook.com ([fe80::bab2:d15c:fcf8:ef2b%4]) with mapi id 15.20.9846.021; Fri, 24 Apr 2026 10:36:18 +0000 From: Shengjiu Wang To: shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, linux-sound@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] ASoC: fsl-asoc-card: reduce WM8904 PLL ratio to meet frequency limit Date: Fri, 24 Apr 2026 18:38:06 +0800 Message-Id: <20260424103806.2276780-6-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20260424103806.2276780-1-shengjiu.wang@nxp.com> References: <20260424103806.2276780-1-shengjiu.wang@nxp.com> Content-Type: text/plain; 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The current S24_LE PLL ratio of 384 exceeds this at high sample rates (96 kHz =C3=97 384 =3D 36.864 MHz). Reduce the ratio to 192 for WM8904, keeping PLL within limits at all supported rates (96 kHz =C3=97 192 =3D 18.432 MHz). Add codec-specific pll_ratio_s24 field, default 384, override to 192 for WM8904. Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl-asoc-card.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index 36c789f15582..e72ce2fa9e9e 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -60,6 +60,9 @@ static const u32 cs42888_channels[] =3D { * @mclk_id: MCLK (or main clock) id for set_sysclk() * @fll_id: FLL (or secordary clock) id for set_sysclk() * @pll_id: PLL id for set_pll() + * @pll_ratio_s24: PLL output ratio for S24_LE format (PLL_freq =3D sample= _rate =C3=97 ratio) + * Default is 384, but some codecs (e.g., WM8904) require = lower values + * to stay within PLL frequency limits */ struct codec_priv { struct clk *mclk; @@ -68,6 +71,7 @@ struct codec_priv { u32 mclk_id; int fll_id; int pll_id; + int pll_ratio_s24; }; =20 /** @@ -242,7 +246,7 @@ static int fsl_asoc_card_hw_params(struct snd_pcm_subst= ream *substream, =20 if (codec_priv->pll_id >=3D 0 && codec_priv->fll_id >=3D 0) { if (priv->sample_format =3D=3D SNDRV_PCM_FORMAT_S24_LE) - pll_out =3D priv->sample_rate * 384; + pll_out =3D priv->sample_rate * codec_priv->pll_ratio_s24; else pll_out =3D priv->sample_rate * 256; =20 @@ -806,6 +810,7 @@ static int fsl_asoc_card_probe(struct platform_device *= pdev) for (codec_idx =3D 0; codec_idx < 2; codec_idx++) { priv->codec_priv[codec_idx].fll_id =3D -1; priv->codec_priv[codec_idx].pll_id =3D -1; + priv->codec_priv[codec_idx].pll_ratio_s24 =3D 384; } =20 /* Diversify the card configurations */ @@ -912,6 +917,7 @@ static int fsl_asoc_card_probe(struct platform_device *= pdev) priv->codec_priv[0].mclk_id =3D WM8904_FLL_MCLK; priv->codec_priv[0].fll_id =3D WM8904_CLK_FLL; priv->codec_priv[0].pll_id =3D WM8904_FLL_MCLK; + priv->codec_priv[0].pll_ratio_s24 =3D 192; priv->dai_fmt |=3D SND_SOC_DAIFMT_CBP_CFP; } else if (of_device_is_compatible(np, "fsl,imx-audio-spdif")) { ret =3D fsl_asoc_card_spdif_init(codec_np, cpu_np, codec_dai_name, priv); --=20 2.34.1