[PATCH v3] ASoC: tda998x: add a codec to the HDMI transmitter

From: Jean-Francois Moine
Date: Tue Jul 08 2014 - 05:38:54 EST

This patch adds a CODEC function to the NXP TDA998x HDMI transmitter.

The CODEC handles both I2S and S/PDIF input and does dynamic input
switch in the TDA998x I2C driver on start/stop audio streaming.

Signed-off-by: Jean-Francois Moine <moinejf@xxxxxxx>
---
v3: fix bad rate (Andrew Jackson)
v2: check double stream start (Mark Brown)
---
.../devicetree/bindings/drm/i2c/tda998x.txt | 13 ++
drivers/gpu/drm/i2c/Makefile | 2 +-
drivers/gpu/drm/i2c/tda998x_codec.c | 247 +++++++++++++++++++++
drivers/gpu/drm/i2c/tda998x_drv.c | 74 ++++--
drivers/gpu/drm/i2c/tda998x_drv.h | 32 +++
include/drm/i2c/tda998x.h | 1 +
6 files changed, 348 insertions(+), 21 deletions(-)
create mode 100644 drivers/gpu/drm/i2c/tda998x_codec.c
create mode 100644 drivers/gpu/drm/i2c/tda998x_drv.h

diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
index d7df01c..7ce4eac 100644
--- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
+++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
@@ -15,6 +15,15 @@ Optional properties:
- video-ports: 24 bits value which defines how the video controller
output is wired to the TDA998x input - default: <0x230145>

+ - audio-ports: one or two values corresponding to entries in
+ the audio-port-names property.
+
+ - audio-port-names: must contain "i2s", "spdif" entries
+ matching entries in the audio-ports property.
+
+ - #sound-dai-cells: must be set to <1> for use with the simple-card.
+ The DAI 0 is the I2S input and the DAI 1 is the S/PDIF input.
+
Example:

tda998x: hdmi-encoder {
@@ -24,4 +33,8 @@ Example:
interrupts = <27 2>; /* falling edge */
pinctrl-0 = <&pmx_camera>;
pinctrl-names = "default";
+
+ audio-ports = <0x03>, <0x04>;
+ audio-port-names = "i2s", "spdif";
+ #sound-dai-cells = <1>;
};
diff --git a/drivers/gpu/drm/i2c/Makefile b/drivers/gpu/drm/i2c/Makefile
index 43aa33b..f2d625c 100644
--- a/drivers/gpu/drm/i2c/Makefile
+++ b/drivers/gpu/drm/i2c/Makefile
@@ -6,5 +6,5 @@ obj-$(CONFIG_DRM_I2C_CH7006) += ch7006.o
sil164-y := sil164_drv.o
obj-$(CONFIG_DRM_I2C_SIL164) += sil164.o

-tda998x-y := tda998x_drv.o
+tda998x-y := tda998x_drv.o tda998x_codec.o
obj-$(CONFIG_DRM_I2C_NXP_TDA998X) += tda998x.o
diff --git a/drivers/gpu/drm/i2c/tda998x_codec.c b/drivers/gpu/drm/i2c/tda998x_codec.c
new file mode 100644
index 0000000..e22f974
--- /dev/null
+++ b/drivers/gpu/drm/i2c/tda998x_codec.c
@@ -0,0 +1,247 @@
+/*
+ * ALSA SoC TDA998X CODEC
+ *
+ * Copyright (C) 2014 Jean-Francois Moine
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/i2c/tda998x.h>
+
+#include "tda998x_drv.h"
+
+#define TDA998X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+static int tda_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
+ u8 *eld = priv->eld;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ u8 *sad;
+ int sad_count;
+ unsigned eld_ver, mnl, rate_mask;
+ unsigned max_channels, fmt;
+ u64 formats;
+ struct snd_pcm_hw_constraint_list *rate_constraints =
+ &priv->rate_constraints;
+ static const u32 hdmi_rates[] = {
+ 32000, 44100, 48000, 88200, 96000, 176400, 192000
+ };
+
+ /* check if streaming is already active */
+ if (priv->dai_id != AFMT_NO_AUDIO)
+ return -EBUSY;
+ priv->dai_id = dai->id;
+
+ if (!eld)
+ return 0;
+
+ /* adjust the hw params from the ELD (EDID) */
+ eld_ver = eld[0] >> 3;
+ if (eld_ver != 2 && eld_ver != 31)
+ return 0;
+
+ mnl = eld[4] & 0x1f;
+ if (mnl > 16)
+ return 0;
+
+ sad_count = eld[5] >> 4;
+ sad = eld + 20 + mnl;
+
+ /* Start from the basic audio settings */
+ max_channels = 2;
+ rate_mask = 0;
+ fmt = 0;
+ while (sad_count--) {
+ switch (sad[0] & 0x78) {
+ case 0x08: /* PCM */
+ max_channels = max(max_channels, (sad[0] & 7) + 1u);
+ rate_mask |= sad[1];
+ fmt |= sad[2] & 0x07;
+ break;
+ }
+ sad += 3;
+ }
+
+ /* set the constraints */
+ rate_constraints->list = hdmi_rates;
+ rate_constraints->count = ARRAY_SIZE(hdmi_rates);
+ rate_constraints->mask = rate_mask;
+ snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ rate_constraints);
+
+ formats = 0;
+ if (fmt & 1)
+ formats |= SNDRV_PCM_FMTBIT_S16_LE;
+ if (fmt & 2)
+ formats |= SNDRV_PCM_FMTBIT_S20_3LE;
+ if (fmt & 4)
+ formats |= SNDRV_PCM_FMTBIT_S24_LE;
+ snd_pcm_hw_constraint_mask64(runtime,
+ SNDRV_PCM_HW_PARAM_FORMAT,
+ formats);
+
+ snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ 1, max_channels);
+ return 0;
+}
+
+static int tda_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
+
+ /* Requires an attached display */
+ if (!priv->encoder->crtc)
+ return -ENODEV;
+
+ /* if same input and same parameters, do not do a full switch */
+ if (dai->id == priv->params.audio_format &&
+ params_format(params) == priv->audio_sample_format) {
+ tda998x_audio_start(priv, 0);
+ return 0;
+ }
+ priv->params.audio_format = dai->id;
+ priv->audio_sample_format = params_format(params);
+ priv->params.audio_cfg =
+ priv->audio_ports[dai->id == AFMT_I2S ? 0 : 1];
+ tda998x_audio_start(priv, 1);
+ return 0;
+}
+
+static void tda_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct tda998x_priv *priv = snd_soc_codec_get_drvdata(dai->codec);
+
+ tda998x_audio_stop(priv);
+ priv->dai_id = AFMT_NO_AUDIO;
+}
+
+static const struct snd_soc_dai_ops tda_ops = {
+ .startup = tda_startup,
+ .hw_params = tda_hw_params,
+ .shutdown = tda_shutdown,
+};
+
+static struct snd_soc_dai_driver tda998x_dai[] = {
+ {
+ .name = "i2s-hifi",
+ .id = AFMT_I2S,
+ .playback = {
+ .stream_name = "HDMI I2S Playback",
+ .channels_min = 1,
+ .channels_max = 8,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 5512,
+ .rate_max = 192000,
+ .formats = TDA998X_FORMATS,
+ },
+ .ops = &tda_ops,
+ },
+ {
+ .name = "spdif-hifi",
+ .id = AFMT_SPDIF,
+ .playback = {
+ .stream_name = "HDMI SPDIF Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 22050,
+ .rate_max = 192000,
+ .formats = TDA998X_FORMATS,
+ },
+ .ops = &tda_ops,
+ },
+};
+
+static const struct snd_soc_dapm_widget tda_widgets[] = {
+ SND_SOC_DAPM_OUTPUT("hdmi-out"),
+};
+static const struct snd_soc_dapm_route tda_routes[] = {
+ { "hdmi-out", NULL, "HDMI I2S Playback" },
+ { "hdmi-out", NULL, "HDMI SPDIF Playback" },
+};
+
+static int tda_probe(struct snd_soc_codec *codec)
+{
+ struct i2c_client *i2c_client = to_i2c_client(codec->dev);
+ struct tda998x_priv *priv = i2c_get_clientdata(i2c_client);
+ struct device_node *np = codec->dev->of_node;
+ int i, j, ret;
+ const char *p;
+
+ if (!priv)
+ return -ENODEV;
+ snd_soc_codec_set_drvdata(codec, priv);
+
+ if (!np)
+ return 0;
+
+ /* get the audio input ports*/
+ for (i = 0; i < 2; i++) {
+ u32 port;
+
+ ret = of_property_read_u32_index(np, "audio-ports", i, &port);
+ if (ret) {
+ if (i == 0)
+ dev_err(codec->dev,
+ "bad or missing audio-ports\n");
+ break;
+ }
+ ret = of_property_read_string_index(np, "audio-port-names",
+ i, &p);
+ if (ret) {
+ dev_err(codec->dev,
+ "missing audio-port-names[%d]\n", i);
+ break;
+ }
+ if (strcmp(p, "i2s") == 0) {
+ j = 0;
+ } else if (strcmp(p, "spdif") == 0) {
+ j = 1;
+ } else {
+ dev_err(codec->dev,
+ "bad audio-port-names '%s'\n", p);
+ break;
+ }
+ priv->audio_ports[j] = port;
+ }
+ return 0;
+}
+
+static const struct snd_soc_codec_driver soc_codec_tda998x = {
+ .probe = tda_probe,
+ .dapm_widgets = tda_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(tda_widgets),
+ .dapm_routes = tda_routes,
+ .num_dapm_routes = ARRAY_SIZE(tda_routes),
+};
+
+int tda998x_codec_register(struct device *dev)
+{
+ return snd_soc_register_codec(dev,
+ &soc_codec_tda998x,
+ tda998x_dai, ARRAY_SIZE(tda998x_dai));
+}
+
+void tda998x_codec_unregister(struct device *dev)
+{
+ snd_soc_unregister_codec(dev);
+}
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 240c331..7e9f9dc 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/irq.h>
#include <sound/asoundef.h>
+#include <sound/pcm_params.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
@@ -28,24 +29,9 @@
#include <drm/drm_edid.h>
#include <drm/i2c/tda998x.h>

-#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
+#include "tda998x_drv.h"

-struct tda998x_priv {
- struct i2c_client *cec;
- struct i2c_client *hdmi;
- uint16_t rev;
- uint8_t current_page;
- int dpms;
- bool is_hdmi_sink;
- u8 vip_cntrl_0;
- u8 vip_cntrl_1;
- u8 vip_cntrl_2;
- struct tda998x_encoder_params params;
-
- wait_queue_head_t wq_edid;
- volatile int wq_edid_wait;
- struct drm_encoder *encoder;
-};
+#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)

#define to_tda998x_priv(x) ((struct tda998x_priv *)to_encoder_slave(x)->slave_priv)

@@ -640,12 +626,11 @@ static void
tda998x_configure_audio(struct tda998x_priv *priv,
struct drm_display_mode *mode, struct tda998x_encoder_params *p)
{
- uint8_t buf[6], clksel_aip, clksel_fs, cts_n, adiv;
+ uint8_t buf[6], clksel_aip, clksel_fs, cts_n, adiv, aclk;
uint32_t n;

/* Enable audio ports */
reg_write(priv, REG_ENA_AP, p->audio_cfg);
- reg_write(priv, REG_ENA_ACLK, p->audio_clk_cfg);

/* Set audio input source */
switch (p->audio_format) {
@@ -654,13 +639,28 @@ tda998x_configure_audio(struct tda998x_priv *priv,
clksel_aip = AIP_CLKSEL_AIP_SPDIF;
clksel_fs = AIP_CLKSEL_FS_FS64SPDIF;
cts_n = CTS_N_M(3) | CTS_N_K(3);
+ aclk = 0; /* no clock */
break;

case AFMT_I2S:
reg_write(priv, REG_MUX_AP, MUX_AP_SELECT_I2S);
clksel_aip = AIP_CLKSEL_AIP_I2S;
clksel_fs = AIP_CLKSEL_FS_ACLK;
- cts_n = CTS_N_M(3) | CTS_N_K(3);
+ /* with I2S input, the CTS_N predivider depends on
+ * the sample width */
+ switch (priv->audio_sample_format) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ cts_n = CTS_N_M(3) | CTS_N_K(1);
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ cts_n = CTS_N_M(3) | CTS_N_K(2);
+ break;
+ default:
+ case SNDRV_PCM_FORMAT_S32_LE:
+ cts_n = CTS_N_M(3) | CTS_N_K(3);
+ break;
+ }
+ aclk = 1; /* clock enable */
break;

default:
@@ -672,6 +672,7 @@ tda998x_configure_audio(struct tda998x_priv *priv,
reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_LAYOUT |
AIP_CNTRL_0_ACR_MAN); /* auto CTS */
reg_write(priv, REG_CTS_N, cts_n);
+ reg_write(priv, REG_ENA_ACLK, aclk);

/*
* Audio input somehow depends on HDMI line rate which is
@@ -728,6 +729,24 @@ tda998x_configure_audio(struct tda998x_priv *priv,
tda998x_write_aif(priv, p);
}

+/* tda998x codec interface */
+void tda998x_audio_start(struct tda998x_priv *priv,
+ int full)
+{
+ struct tda998x_encoder_params *p = &priv->params;
+
+ if (!full) {
+ reg_write(priv, REG_ENA_AP, p->audio_cfg);
+ return;
+ }
+ tda998x_configure_audio(priv, &priv->encoder->crtc->hwmode, p);
+}
+
+void tda998x_audio_stop(struct tda998x_priv *priv)
+{
+ reg_write(priv, REG_ENA_AP, 0);
+}
+
/* DRM encoder functions */

static void
@@ -1149,6 +1168,11 @@ tda998x_encoder_get_modes(struct drm_encoder *encoder,
drm_mode_connector_update_edid_property(connector, edid);
n = drm_add_edid_modes(connector, edid);
priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid);
+
+ /* keep the EDID as ELD for the audio subsystem */
+ drm_edid_to_eld(connector, edid);
+ priv->eld = connector->eld;
+
kfree(edid);
}

@@ -1191,6 +1215,8 @@ tda998x_encoder_destroy(struct drm_encoder *encoder)
if (priv->hdmi->irq)
free_irq(priv->hdmi->irq, priv);

+ tda998x_codec_unregister(&priv->hdmi->dev);
+
if (priv->cec)
i2c_unregister_device(priv->cec);
kfree(priv);
@@ -1239,10 +1265,15 @@ tda998x_encoder_init(struct i2c_client *client,
if (!priv)
return -ENOMEM;

+ i2c_set_clientdata(client, priv);
+
priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(2) | VIP_CNTRL_0_SWAP_B(3);
priv->vip_cntrl_1 = VIP_CNTRL_1_SWAP_C(0) | VIP_CNTRL_1_SWAP_D(1);
priv->vip_cntrl_2 = VIP_CNTRL_2_SWAP_E(4) | VIP_CNTRL_2_SWAP_F(5);

+ priv->params.audio_frame[1] = 1; /* channels - 1 */
+ priv->params.audio_sample_rate = 48000; /* 48kHz */
+
priv->current_page = 0xff;
priv->hdmi = client;
priv->cec = i2c_new_dummy(client->adapter, 0x34);
@@ -1340,6 +1371,9 @@ tda998x_encoder_init(struct i2c_client *client,
/* enable EDID read irq: */
reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);

+ /* register the audio CODEC */
+ tda998x_codec_register(&client->dev);
+
if (!np)
return 0; /* non-DT */

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.h b/drivers/gpu/drm/i2c/tda998x_drv.h
new file mode 100644
index 0000000..e6c8dd5
--- /dev/null
+++ b/drivers/gpu/drm/i2c/tda998x_drv.h
@@ -0,0 +1,32 @@
+/* tda998x private data */
+
+struct tda998x_priv {
+ struct i2c_client *cec;
+ struct i2c_client *hdmi;
+ uint16_t rev;
+ uint8_t current_page;
+ int dpms;
+ bool is_hdmi_sink;
+ u8 vip_cntrl_0;
+ u8 vip_cntrl_1;
+ u8 vip_cntrl_2;
+ struct tda998x_encoder_params params;
+
+ wait_queue_head_t wq_edid;
+ volatile int wq_edid_wait;
+ struct drm_encoder *encoder;
+
+ u8 audio_ports[2];
+ int audio_sample_format;
+ int dai_id; /* DAI ID when streaming active */
+
+ u8 *eld;
+
+ struct snd_pcm_hw_constraint_list rate_constraints;
+};
+
+int tda998x_codec_register(struct device *dev);
+void tda998x_codec_unregister(struct device *dev);
+
+void tda998x_audio_start(struct tda998x_priv *priv, int full);
+void tda998x_audio_stop(struct tda998x_priv *priv);
diff --git a/include/drm/i2c/tda998x.h b/include/drm/i2c/tda998x.h
index 3e419d9..31757df 100644
--- a/include/drm/i2c/tda998x.h
+++ b/include/drm/i2c/tda998x.h
@@ -20,6 +20,7 @@ struct tda998x_encoder_params {
u8 audio_frame[6];

enum {
+ AFMT_NO_AUDIO = 0,
AFMT_SPDIF,
AFMT_I2S
} audio_format;
--
2.0.1
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