[PATCH RFC v5 7/8] drm/i2c: tda998x: Register ASoC HDMI codec for audio functionality

[Jyri Sarha <jsarha@ti.com>]

Register ASoC HDMI codec for audio functionality. This is an initial
ASoC audio implementation for tda998x driver and it does not use all
the features provided by hdmi-codec.

HDMI audio info-frame and audio stream header is generated by the ASoC
HDMI codec. The codec also applies constraints for available
sample-rates.

Implementation of audio_startup for hdmi_codec_ops would enable
tda998x driver to abort ongoing playback if the HDMI cable is
unplugged or re-plugged to a device without audio capability.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
 drivers/gpu/drm/i2c/Kconfig       |   1 +
 drivers/gpu/drm/i2c/tda998x_drv.c | 179 +++++++++++++++++++++++++++++++-------
 include/drm/i2c/tda998x.h         |   1 +
 3 files changed, 148 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
index 22c7ed6..088f278 100644
--- a/drivers/gpu/drm/i2c/Kconfig
+++ b/drivers/gpu/drm/i2c/Kconfig
@@ -28,6 +28,7 @@ config DRM_I2C_SIL164
 config DRM_I2C_NXP_TDA998X
 	tristate "NXP Semiconductors TDA998X HDMI encoder"
 	default m if DRM_TILCDC
+	select SND_SOC_HDMI_CODEC if SND_SOC
 	help
 	  Support for NXP Semiconductors TDA998X HDMI encoders.
 
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 42d256a..b3b9559 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <sound/asoundef.h>
+#include <sound/hdmi-codec.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
@@ -30,9 +31,9 @@
 
 #define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
 
-struct tda998x_audio {
-	u8 ports[2];			/* AP value */
-	u8 port_types[2];		/* AFMT_xxx */
+struct tda998x_audio_port {
+	u8 format;		/* AFMT_xxx */
+	u8 config;		/* AP value */
 };
 
 struct tda998x_priv {
@@ -48,6 +49,8 @@ struct tda998x_priv {
 	u8 vip_cntrl_2;
 	struct tda998x_audio_params audio_params;
 
+	struct platform_device *audio_pdev;
+
 	wait_queue_head_t wq_edid;
 	volatile int wq_edid_wait;
 
@@ -59,7 +62,7 @@ struct tda998x_priv {
 	struct drm_encoder encoder;
 	struct drm_connector connector;
 
-	struct tda998x_audio audio;
+	struct tda998x_audio_port audio_port[2];
 };
 
 #define conn_to_tda998x_priv(x) \
@@ -749,7 +752,7 @@ tda998x_configure_audio(struct tda998x_priv *priv,
 		break;
 
 	default:
-		BUG();
+		dev_err(&priv->hdmi->dev, "Unsupported I2S format\n");
 		return -EINVAL;
 	}
 
@@ -1070,7 +1073,7 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
 
 		tda998x_write_avi(priv, adjusted_mode);
 
-		if (priv->audio_params.config) {
+		if (priv->audio_params.format != AFMT_UNUSED) {
 			tda998x_configure_audio(priv,
 						&priv->audio_params,
 						adjusted_mode->clock);
@@ -1174,6 +1177,8 @@ static int tda998x_connector_get_modes(struct drm_connector *connector)
 	drm_mode_connector_update_edid_property(connector, edid);
 	n = drm_add_edid_modes(connector, edid);
 	priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid);
+	drm_edid_to_eld(connector, edid);
+
 	kfree(edid);
 
 	return n;
@@ -1195,6 +1200,9 @@ static void tda998x_destroy(struct tda998x_priv *priv)
 	cec_write(priv, REG_CEC_RXSHPDINTENA, 0);
 	reg_clear(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
 
+	if (priv->audio_pdev)
+		platform_device_unregister(priv->audio_pdev);
+
 	if (priv->hdmi->irq)
 		free_irq(priv->hdmi->irq, priv);
 
@@ -1204,6 +1212,133 @@ static void tda998x_destroy(struct tda998x_priv *priv)
 	i2c_unregister_device(priv->cec);
 }
 
+static int tda998x_audio_hw_params(struct device *dev,
+				   struct hdmi_codec_daifmt *daifmt,
+				   struct hdmi_codec_params *params)
+{
+	struct tda998x_priv *priv = dev_get_drvdata(dev);
+	int i, ret;
+	struct tda998x_audio_params audio = {
+		.sample_width = params->sample_width,
+		.sample_rate = params->sample_rate,
+		.cea = params->cea,
+	};
+
+	if (!priv->encoder.crtc)
+		return -ENODEV;
+
+	memcpy(audio.status, params->iec.status,
+	       min(sizeof(audio.status), sizeof(params->iec.status)));
+
+	switch (daifmt->fmt) {
+	case HDMI_I2S:
+		if (daifmt->bit_clk_inv || daifmt->frame_clk_inv ||
+		    daifmt->bit_clk_master || daifmt->frame_clk_master) {
+			dev_err(dev, "%s: Bad flags %d %d %d %d\n", __func__,
+				daifmt->bit_clk_inv, daifmt->frame_clk_inv,
+				daifmt->bit_clk_master,
+				daifmt->frame_clk_master);
+			return -EINVAL;
+		}
+		for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++)
+			if (priv->audio_port[i].format == AFMT_I2S)
+				audio.config = priv->audio_port[i].config;
+		audio.format = AFMT_I2S;
+		break;
+	case HDMI_SPDIF:
+		for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++)
+			if (priv->audio_port[i].format == AFMT_SPDIF)
+				audio.config = priv->audio_port[i].config;
+		audio.format = AFMT_SPDIF;
+		break;
+	default:
+		dev_err(dev, "%s: Invalid format %d\n", __func__, daifmt->fmt);
+		return -EINVAL;
+	}
+
+	if (audio.config == 0) {
+		dev_err(dev, "%s: No audio configutation found\n", __func__);
+		return -EINVAL;
+	}
+
+	ret = tda998x_configure_audio(priv,
+				      &audio,
+				      priv->encoder.crtc->hwmode.clock);
+
+	return ret;
+}
+
+static void tda998x_audio_shutdown(struct device *dev)
+{
+	struct tda998x_priv *priv = dev_get_drvdata(dev);
+
+	reg_write(priv, REG_ENA_AP, 0);
+}
+
+int tda998x_audio_digital_mute(struct device *dev, bool enable)
+{
+	struct tda998x_priv *priv = dev_get_drvdata(dev);
+
+	tda998x_audio_mute(priv, enable);
+
+	return 0;
+}
+
+static int tda998x_audio_get_eld(struct device *dev, uint8_t *buf, size_t len)
+{
+	struct tda998x_priv *priv = dev_get_drvdata(dev);
+	struct drm_mode_config *config = &priv->encoder.dev->mode_config;
+	struct drm_connector *connector;
+	int ret = -ENODEV;
+
+	mutex_lock(&config->mutex);
+	list_for_each_entry(connector, &config->connector_list, head) {
+		if (&priv->encoder == connector->encoder) {
+			memcpy(buf, connector->eld,
+			       min(sizeof(connector->eld), len));
+			ret = 0;
+		}
+	}
+	mutex_unlock(&config->mutex);
+
+	return ret;
+}
+
+static const struct hdmi_codec_ops audio_codec_ops = {
+	.hw_params = tda998x_audio_hw_params,
+	.audio_shutdown = tda998x_audio_shutdown,
+	.digital_mute = tda998x_audio_digital_mute,
+	.get_eld = tda998x_audio_get_eld,
+};
+
+static int tda998x_audio_codec_init(struct tda998x_priv *priv,
+				    struct device *dev)
+{
+	struct hdmi_codec_pdata codec_data = {
+		.ops = &audio_codec_ops,
+		.max_i2s_channels = 2,
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++) {
+		if (priv->audio_port[i].format == AFMT_I2S &&
+		    priv->audio_port[i].config != 0)
+			codec_data.i2s = 1;
+		if (priv->audio_port[i].format == AFMT_SPDIF &&
+		    priv->audio_port[i].config != 0)
+			codec_data.spdif = 1;
+	}
+
+	priv->audio_pdev = platform_device_register_data(
+		dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
+		&codec_data, sizeof(codec_data));
+
+	if (IS_ERR(priv->audio_pdev))
+		return PTR_ERR(priv->audio_pdev);
+
+	return 0;
+}
+
 /* I2C driver functions */
 
 static int tda998x_parse_ports(struct tda998x_priv *priv,
@@ -1244,12 +1379,12 @@ static int tda998x_parse_ports(struct tda998x_priv *priv,
 			afmt = AFMT_SPDIF;
 		else
 			continue;
-		if (audio_index >= ARRAY_SIZE(priv->audio.ports)) {
+		if (audio_index >= ARRAY_SIZE(priv->audio_port)) {
 			dev_err(&priv->hdmi->dev, "too many audio ports\n");
 			break;
 		}
-		priv->audio.ports[audio_index] = reg;
-		priv->audio.port_types[audio_index] = afmt;
+		priv->audio_port[audio_index].format = afmt;
+		priv->audio_port[audio_index].config = reg;
 		audio_index++;
 	}
 	return rgb_initialized;
@@ -1385,30 +1520,8 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
 				priv->vip_cntrl_2 = video;
 			}
 		}
-		if (priv->audio.ports[0]) {
-			struct tda998x_audio_params params = {
-				.config = priv->audio.ports[0],
-				.format = priv->audio.port_types[0],
-				.sample_width = 24,
-				.sample_rate = 44100,
-				.cea = {
-					.channels = 2,
-					.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM,
-					.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM,
-					.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM,
-				},
-				.status = {
-					IEC958_AES0_CON_NOT_COPYRIGHT,
-					IEC958_AES1_CON_GENERAL,
-					IEC958_AES2_CON_SOURCE_UNSPEC |
-					IEC958_AES2_CON_CHANNEL_UNSPEC,
-					IEC958_AES3_CON_CLOCK_1000PPM |
-					IEC958_AES3_CON_FS_NOTID,
-				},
-			};
-
-			priv->audio_params = params;
-		}
+		if (priv->audio_port[0].format != AFMT_UNUSED)
+			tda998x_audio_codec_init(priv, &client->dev);
 	}
 
 	return 0;
diff --git a/include/drm/i2c/tda998x.h b/include/drm/i2c/tda998x.h
index dfe7829..5a0cabb 100644
--- a/include/drm/i2c/tda998x.h
+++ b/include/drm/i2c/tda998x.h
@@ -4,6 +4,7 @@
 struct tda998x_audio_params {
 	u8 config;
 	enum {
+		AFMT_UNUSED = 0,
 		AFMT_SPDIF,
 		AFMT_I2S
 	} format;
-- 
1.9.1

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