Some audio hardware cannot support a fixed slot width or a slot width equal to the sample width in all cases. This is usually due either to limitations of the audio serial port or system clocking restrictions. A typical example would be:
- 16-bit samples in 16-bit slots - 24-bit samples in 32-bit slots
The new dai-tdm-slot-width-map property allows setting a mapping of sample widths and the corresponding tdm slot widths. The content is an array of integers. Each pair of values are the sample_width and the corresponding slot width.
The property is added to each endpoint node that needs the restriction.
Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com --- include/sound/simple_card_utils.h | 10 +++ sound/soc/generic/audio-graph-card2.c | 4 ++ sound/soc/generic/simple-card-utils.c | 93 +++++++++++++++++++++++++++ 3 files changed, 107 insertions(+)
diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h index 5ee269c59aac..ee0374b0c7d1 100644 --- a/include/sound/simple_card_utils.h +++ b/include/sound/simple_card_utils.h @@ -16,6 +16,11 @@ #define asoc_simple_init_mic(card, sjack, prefix) \ asoc_simple_init_jack(card, sjack, 0, prefix, NULL)
+struct asoc_simple_tdm_width_map { + int sample_bits; + int slot_width; +}; + struct asoc_simple_dai { const char *name; unsigned int sysclk; @@ -26,6 +31,8 @@ struct asoc_simple_dai { unsigned int rx_slot_mask; struct clk *clk; bool clk_fixed; + struct asoc_simple_tdm_width_map *tdm_width_map; + int n_tdm_widths; };
struct asoc_simple_data { @@ -132,6 +139,9 @@ int asoc_simple_parse_daifmt(struct device *dev, struct device_node *codec, char *prefix, unsigned int *retfmt); +int asoc_simple_parse_tdm_width_map(struct device *dev, struct device_node *np, + struct asoc_simple_dai *dai); + __printf(3, 4) int asoc_simple_set_dailink_name(struct device *dev, struct snd_soc_dai_link *dai_link, diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c index c3947347dda3..c0f3907a01fd 100644 --- a/sound/soc/generic/audio-graph-card2.c +++ b/sound/soc/generic/audio-graph-card2.c @@ -503,6 +503,10 @@ static int __graph_parse_node(struct asoc_simple_priv *priv, if (ret < 0) return ret;
+ ret = asoc_simple_parse_tdm_width_map(dev, ep, dai); + if (ret < 0) + return ret; + ret = asoc_simple_parse_clk(dev, ep, dai, dlc); if (ret < 0) return ret; diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c index a4babfb63175..8ff7966b7632 100644 --- a/sound/soc/generic/simple-card-utils.c +++ b/sound/soc/generic/simple-card-utils.c @@ -12,6 +12,7 @@ #include <linux/of_gpio.h> #include <linux/of_graph.h> #include <sound/jack.h> +#include <sound/pcm_params.h> #include <sound/simple_card_utils.h>
void asoc_simple_convert_fixup(struct asoc_simple_data *data, @@ -87,6 +88,49 @@ int asoc_simple_parse_daifmt(struct device *dev, } EXPORT_SYMBOL_GPL(asoc_simple_parse_daifmt);
+int asoc_simple_parse_tdm_width_map(struct device *dev, struct device_node *np, + struct asoc_simple_dai *dai) +{ + u32 *array_values; + int n, i, ret; + + if (!of_property_read_bool(np, "dai-tdm-slot-width-map")) + return 0; + + n = of_property_count_elems_of_size(np, "dai-tdm-slot-width-map", sizeof(u32)); + if (n % 1) { + dev_err(dev, "Invalid number of cells for dai-tdm-slot-width-map\n"); + return -EINVAL; + } + + dai->tdm_width_map = devm_kcalloc(dev, n, sizeof(*dai->tdm_width_map), GFP_KERNEL); + if (!dai->tdm_width_map) + return -ENOMEM; + + array_values = kcalloc(n, sizeof(*array_values), GFP_KERNEL); + if (!array_values) + return -ENOMEM; + + ret = of_property_read_u32_array(np, "dai-tdm-slot-width-map", array_values, n); + if (ret < 0) { + dev_err(dev, "Could not read dai-tdm-slot-width-map: %d\n", ret); + goto out; + } + + for (i = 0; i < n; i += 2) { + dai->tdm_width_map[i / 2].sample_bits = array_values[i]; + dai->tdm_width_map[i / 2].slot_width = array_values[i + 1]; + } + + dai->n_tdm_widths = n / 2; + ret = 0; +out: + kfree(array_values); + + return ret; +} +EXPORT_SYMBOL_GPL(asoc_simple_parse_tdm_width_map); + int asoc_simple_set_dailink_name(struct device *dev, struct snd_soc_dai_link *dai_link, const char *fmt, ...) @@ -309,6 +353,40 @@ static int asoc_simple_set_clk_rate(struct device *dev, return clk_set_rate(simple_dai->clk, rate); }
+static int asoc_simple_set_tdm(struct snd_soc_dai *dai, + struct asoc_simple_dai *simple_dai, + struct snd_pcm_hw_params *params) +{ + int slot_width = params_width(params); + int sample_bits = params_width(params); + int i, ret; + + if (!simple_dai || !simple_dai->tdm_width_map) + return 0; + + if (simple_dai->slot_width) + slot_width = simple_dai->slot_width; + + for (i = 0; i < simple_dai->n_tdm_widths; ++i) { + if (simple_dai->tdm_width_map[i].sample_bits == sample_bits) { + slot_width = simple_dai->tdm_width_map[i].slot_width; + break; + } + } + + ret = snd_soc_dai_set_tdm_slot(dai, + simple_dai->tx_slot_mask, + simple_dai->rx_slot_mask, + simple_dai->slots, + slot_width); + if (ret && ret != -ENOTSUPP) { + dev_err(dai->dev, "simple-card: set_tdm_slot error: %d\n", ret); + return ret; + } + + return 0; +} + int asoc_simple_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { @@ -362,6 +440,21 @@ int asoc_simple_hw_params(struct snd_pcm_substream *substream, return ret; } } + + for_each_prop_dai_codec(props, i, pdai) { + sdai = asoc_rtd_to_codec(rtd, i); + ret = asoc_simple_set_tdm(sdai, pdai, params); + if (ret < 0) + return ret; + } + + for_each_prop_dai_cpu(props, i, pdai) { + sdai = asoc_rtd_to_cpu(rtd, i); + ret = asoc_simple_set_tdm(sdai, pdai, params); + if (ret < 0) + return ret; + } + return 0; } EXPORT_SYMBOL_GPL(asoc_simple_hw_params);