[PATCH v2 6/7] ASoC: samsung: Add support for HDMI audio on TM2 board

Sylwester Nawrocki
2018-02-12T16:15:37Z

This patch defines I2S1 - HDMI DAI link and implements related
hw_params callback. The AUD PLL frequency is configured through
the CLK_SCLK_I2S1 leaf clock, the exynos5433 clock tree
definitions are updated in a separate patch.

The device tree parsing part is changed is a way it supports older
DTBs with just a single CPU DAI specified, without the HDMI link.

Signed-off-by: Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
Changes since v1:
- dropped the AUD PLL frequency adjustments, only 48k, 96k,
192k sample rates will be supported.
---
sound/soc/samsung/tm2_wm5110.c | 152 ++++++++++++++++++++++++++++++++++-------
1 file changed, 129 insertions(+), 23 deletions(-)

diff --git a/sound/soc/samsung/tm2_wm5110.c b/sound/soc/samsung/tm2_wm5110.c
index a55d18703fe7..b6a492f1ec02 100644
--- a/sound/soc/samsung/tm2_wm5110.c
+++ b/sound/soc/samsung/tm2_wm5110.c
@@ -210,6 +210,59 @@ static struct snd_soc_ops tm2_aif2_ops = {
.hw_free = tm2_aif2_hw_free,
};

+static int tm2_hdmi_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ unsigned int bfs;
+ int bitwidth, ret;
+
+ bitwidth = snd_pcm_format_width(params_format(params));
+ if (bitwidth < 0) {
+ dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
+ return bitwidth;
+ }
+
+ switch (bitwidth) {
+ case 48:
+ bfs = 64;
+ break;
+ case 16:
+ bfs = 32;
+ break;
+ default:
+ dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
+ return -EINVAL;
+ }
+
+ switch (params_rate(params)) {
+ case 48000:
+ case 96000:
+ case 192000:
+ break;
+ default:
+ dev_err(rtd->card->dev, "Unsupported sample rate: %d\n",
+ params_rate(params));
+ return -EINVAL;
+ }
+
+ ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK,
+ 0, SAMSUNG_I2S_OPCLK_PCLK);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_dai_set_clkdiv(cpu_dai, SAMSUNG_I2S_DIV_BCLK, bfs);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static struct snd_soc_ops tm2_hdmi_ops = {
+ .hw_params = tm2_hdmi_hw_params,
+};
+
static int tm2_mic_bias(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
@@ -405,6 +458,12 @@ static struct snd_soc_dai_link tm2_dai_links[] = {
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM,
.ignore_suspend = 1,
+ }, {
+ .name = "HDMI",
+ .stream_name = "i2s1",
+ .ops = &tm2_hdmi_ops,
+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
}
};

@@ -412,7 +471,6 @@ static struct snd_soc_card tm2_card = {
.owner = THIS_MODULE,

.dai_link = tm2_dai_links,
- .num_links = ARRAY_SIZE(tm2_dai_links),
.controls = tm2_controls,
.num_controls = ARRAY_SIZE(tm2_controls),
.dapm_widgets = tm2_dapm_widgets,
@@ -426,11 +484,14 @@ static struct snd_soc_card tm2_card = {

static int tm2_probe(struct platform_device *pdev)
{
+ struct device_node *cpu_dai_node[2] = {};
+ struct device_node *codec_dai_node[2] = {};
+ const char *cells_name = NULL;
struct device *dev = &pdev->dev;
struct snd_soc_card *card = &tm2_card;
struct tm2_machine_priv *priv;
- struct device_node *cpu_dai_node, *codec_dai_node;
- int ret, i;
+ struct of_phandle_args args;
+ int num_codecs, ret, i;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -464,47 +525,92 @@ static int tm2_probe(struct platform_device *pdev)
return -EINVAL;
}

- cpu_dai_node = of_parse_phandle(dev->of_node, "i2s-controller", 0);
- if (!cpu_dai_node) {
- dev_err(dev, "i2s-controllers property invalid or missing\n");
- ret = -EINVAL;
- goto amp_node_put;
+ num_codecs = of_count_phandle_with_args(dev->of_node, "audio-codec",
+ NULL);
+
+ /* Skip the HDMI link if not specified in DT */
+ if (num_codecs > 1) {
+ card->num_links = ARRAY_SIZE(tm2_dai_links);
+ cells_name = "#sound-dai-cells";
+ } else {
+ card->num_links = ARRAY_SIZE(tm2_dai_links) - 1;
}

- codec_dai_node = of_parse_phandle(dev->of_node, "audio-codec", 0);
- if (!codec_dai_node) {
- dev_err(dev, "audio-codec property invalid or missing\n");
- ret = -EINVAL;
- goto cpu_dai_node_put;
+ for (i = 0; i < num_codecs; i++) {
+ struct of_phandle_args args;
+
+ ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
+ cells_name, i, &args);
+ if (!args.np) {
+ dev_err(dev, "i2s-controller property parse error: %d\n", i);
+ ret = -EINVAL;
+ goto dai_node_put;
+ }
+ cpu_dai_node[i] = args.np;
+
+ codec_dai_node[i] = of_parse_phandle(dev->of_node,
+ "audio-codec", i);
+ if (!codec_dai_node[i]) {
+ dev_err(dev, "audio-codec property parse error\n");
+ ret = -EINVAL;
+ goto dai_node_put;
+ }
}

+ /* Initialize WM5110 - I2S and HDMI - I2S1 DAI links */
for (i = 0; i < card->num_links; i++) {
+ unsigned int dai_index = 0; /* WM5110 */
+
card->dai_link[i].cpu_name = NULL;
card->dai_link[i].platform_name = NULL;
- card->dai_link[i].codec_of_node = codec_dai_node;
- card->dai_link[i].cpu_of_node = cpu_dai_node;
- card->dai_link[i].platform_of_node = cpu_dai_node;
+
+ if (num_codecs > 1 && i == card->num_links - 1)
+ dai_index = 1; /* HDMI */
+
+ card->dai_link[i].codec_of_node = codec_dai_node[dai_index];
+ card->dai_link[i].cpu_of_node = cpu_dai_node[dai_index];
+ card->dai_link[i].platform_of_node = cpu_dai_node[dai_index];
+ }
+
+ if (num_codecs > 1) {
+ /* HDMI DAI link (I2S1) */
+ i = card->num_links - 1;
+
+ ret = of_parse_phandle_with_fixed_args(dev->of_node,
+ "audio-codec", 0, 1, &args);
+ if (ret) {
+ dev_err(dev, "audio-codec property parse error\n");
+ goto dai_node_put;
+ }
+
+ ret = snd_soc_get_dai_name(&args, &card->dai_link[i].codec_dai_name);
+ if (ret) {
+ dev_err(dev, "Unable to get codec_dai_name\n");
+ goto dai_node_put;
+ }
}

ret = devm_snd_soc_register_component(dev, &tm2_component,
tm2_ext_dai, ARRAY_SIZE(tm2_ext_dai));
if (ret < 0) {
dev_err(dev, "Failed to register component: %d\n", ret);
- goto codec_dai_node_put;
+ goto dai_node_put;
}

ret = devm_snd_soc_register_card(dev, card);
if (ret < 0) {
dev_err(dev, "Failed to register card: %d\n", ret);
- goto codec_dai_node_put;
+ goto dai_node_put;
+ }
+
+dai_node_put:
+ for (i = 0; i < num_codecs; i++) {
+ of_node_put(codec_dai_node[i]);
+ of_node_put(cpu_dai_node[i]);
}

-codec_dai_node_put:
- of_node_put(codec_dai_node);
-cpu_dai_node_put:
- of_node_put(cpu_dai_node);
-amp_node_put:
of_node_put(card->aux_dev[0].codec_of_node);
+
return ret;
}

--
2.14.2

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