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This behavior is also implied if the system-clock-frequency parameter is set explicitly - the flag is meant for cases where a clock is mapped to the DAI but which is, or should be treated as, fixed. When mclk-fs is also specified, this causes a PCM constraint to be added which enforces that only the corresponding valid sample rate can be used. Signed-off-by: Robert Hancock --- include/sound/simple_card_utils.h | 1 + sound/soc/generic/simple-card-utils.c | 71 ++++++++++++++++++++++----- 2 files changed, 61 insertions(+), 11 deletions(-) diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h index df430f1c2a10..5ee269c59aac 100644 --- a/include/sound/simple_card_utils.h +++ b/include/sound/simple_card_utils.h @@ -25,6 +25,7 @@ struct asoc_simple_dai { unsigned int tx_slot_mask; unsigned int rx_slot_mask; struct clk *clk; + bool clk_fixed; }; struct asoc_simple_data { diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c index 9736102e6808..a4babfb63175 100644 --- a/sound/soc/generic/simple-card-utils.c +++ b/sound/soc/generic/simple-card-utils.c @@ -165,12 +165,15 @@ int asoc_simple_parse_clk(struct device *dev, * or device's module clock. */ clk = devm_get_clk_from_child(dev, node, NULL); + simple_dai->clk_fixed = of_property_read_bool( + node, "system-clock-fixed"); if (!IS_ERR(clk)) { simple_dai->sysclk = clk_get_rate(clk); simple_dai->clk = clk; } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) { simple_dai->sysclk = val; + simple_dai->clk_fixed = true; } else { clk = devm_get_clk_from_child(dev, dlc->of_node, NULL); if (!IS_ERR(clk)) @@ -184,12 +187,29 @@ int asoc_simple_parse_clk(struct device *dev, } EXPORT_SYMBOL_GPL(asoc_simple_parse_clk); +static int asoc_simple_check_fixed_sysclk(struct device *dev, + struct asoc_simple_dai *dai, + unsigned int *fixed_sysclk) +{ + if (dai->clk_fixed) { + if (*fixed_sysclk && *fixed_sysclk != dai->sysclk) { + dev_err(dev, "inconsistent fixed sysclk rates (%u vs %u)\n", + *fixed_sysclk, dai->sysclk); + return -EINVAL; + } + *fixed_sysclk = dai->sysclk; + } + + return 0; +} + int asoc_simple_startup(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card); struct simple_dai_props *props = simple_priv_to_props(priv, rtd->num); struct asoc_simple_dai *dai; + unsigned int fixed_sysclk = 0; int i1, i2, i; int ret; @@ -197,12 +217,32 @@ int asoc_simple_startup(struct snd_pcm_substream *substream) ret = asoc_simple_clk_enable(dai); if (ret) goto cpu_err; + ret = asoc_simple_check_fixed_sysclk(rtd->dev, dai, &fixed_sysclk); + if (ret) + goto cpu_err; } for_each_prop_dai_codec(props, i2, dai) { ret = asoc_simple_clk_enable(dai); if (ret) goto codec_err; + ret = asoc_simple_check_fixed_sysclk(rtd->dev, dai, &fixed_sysclk); + if (ret) + goto codec_err; + } + + if (fixed_sysclk && props->mclk_fs) { + unsigned int fixed_rate = fixed_sysclk / props->mclk_fs; + + if (fixed_sysclk % props->mclk_fs) { + dev_err(rtd->dev, "fixed sysclk %u not divisible by mclk_fs %u\n", + fixed_sysclk, props->mclk_fs); + return -EINVAL; + } + ret = snd_pcm_hw_constraint_minmax(substream->runtime, SNDRV_PCM_HW_PARAM_RATE, + fixed_rate, fixed_rate); + if (ret) + goto codec_err; } return 0; @@ -226,31 +266,40 @@ EXPORT_SYMBOL_GPL(asoc_simple_startup); void asoc_simple_shutdown(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); - struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); - struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card); struct simple_dai_props *props = simple_priv_to_props(priv, rtd->num); struct asoc_simple_dai *dai; int i; - if (props->mclk_fs) { - snd_soc_dai_set_sysclk(codec_dai, 0, 0, SND_SOC_CLOCK_IN); - snd_soc_dai_set_sysclk(cpu_dai, 0, 0, SND_SOC_CLOCK_OUT); - } + for_each_prop_dai_cpu(props, i, dai) { + if (props->mclk_fs && !dai->clk_fixed) + snd_soc_dai_set_sysclk(asoc_rtd_to_cpu(rtd, i), + 0, 0, SND_SOC_CLOCK_IN); - for_each_prop_dai_cpu(props, i, dai) asoc_simple_clk_disable(dai); - for_each_prop_dai_codec(props, i, dai) + } + for_each_prop_dai_codec(props, i, dai) { + if (props->mclk_fs && !dai->clk_fixed) + snd_soc_dai_set_sysclk(asoc_rtd_to_codec(rtd, i), + 0, 0, SND_SOC_CLOCK_IN); + asoc_simple_clk_disable(dai); + } } EXPORT_SYMBOL_GPL(asoc_simple_shutdown); -static int asoc_simple_set_clk_rate(struct asoc_simple_dai *simple_dai, +static int asoc_simple_set_clk_rate(struct device *dev, + struct asoc_simple_dai *simple_dai, unsigned long rate) { if (!simple_dai) return 0; + if (simple_dai->clk_fixed && rate != simple_dai->sysclk) { + dev_err(dev, "dai %s invalid clock rate %lu\n", simple_dai->name, rate); + return -EINVAL; + } + if (!simple_dai->clk) return 0; @@ -279,13 +328,13 @@ int asoc_simple_hw_params(struct snd_pcm_substream *substream, mclk = params_rate(params) * mclk_fs; for_each_prop_dai_codec(props, i, pdai) { - ret = asoc_simple_set_clk_rate(pdai, mclk); + ret = asoc_simple_set_clk_rate(rtd->dev, pdai, mclk); if (ret < 0) return ret; } for_each_prop_dai_cpu(props, i, pdai) { - ret = asoc_simple_set_clk_rate(pdai, mclk); + ret = asoc_simple_set_clk_rate(rtd->dev, pdai, mclk); if (ret < 0) return ret; }