[PATCH 3/3] drm: bridge: it66121: Add audio support
Nicolas Belin
nbelin at baylibre.com
Wed Mar 16 13:57:33 UTC 2022
Adding the audio support on the HDMI bridge for I2S only.
Signed-off-by: Nicolas Belin <nbelin at baylibre.com>
Signed-off-by: Andy.Hsieh <Andy.Hsieh at mediatek.com>
---
drivers/gpu/drm/bridge/ite-it66121.c | 627 +++++++++++++++++++++++++++
1 file changed, 627 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 64912b770086..514989676d07 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -27,6 +27,8 @@
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
+#include <sound/hdmi-codec.h>
+
#define IT66121_VENDOR_ID0_REG 0x00
#define IT66121_VENDOR_ID1_REG 0x01
#define IT66121_DEVICE_ID0_REG 0x02
@@ -155,6 +157,9 @@
#define IT66121_AV_MUTE_ON BIT(0)
#define IT66121_AV_MUTE_BLUESCR BIT(1)
+#define IT66121_PKT_CTS_CTRL_REG 0xC5
+#define IT66121_PKT_CTS_CTRL_SEL BIT(1)
+
#define IT66121_PKT_GEN_CTRL_REG 0xC6
#define IT66121_PKT_GEN_CTRL_ON BIT(0)
#define IT66121_PKT_GEN_CTRL_RPT BIT(1)
@@ -202,6 +207,89 @@
#define IT66121_EDID_SLEEP_US 20000
#define IT66121_EDID_TIMEOUT_US 200000
#define IT66121_EDID_FIFO_SIZE 32
+
+#define IT66121_CLK_CTRL0_REG 0x58
+#define IT66121_CLK_CTRL0_AUTO_OVER_SAMPLING BIT(4)
+#define IT66121_CLK_CTRL0_EXT_MCLK_MASK GENMASK(3, 2)
+#define IT66121_CLK_CTRL0_EXT_MCLK_128FS (0 << 2)
+#define IT66121_CLK_CTRL0_EXT_MCLK_256FS BIT(2)
+#define IT66121_CLK_CTRL0_EXT_MCLK_512FS (2 << 2)
+#define IT66121_CLK_CTRL0_EXT_MCLK_1024FS (3 << 2)
+#define IT66121_CLK_CTRL0_AUTO_IPCLK BIT(0)
+#define IT66121_CLK_STATUS1_REG 0x5E
+#define IT66121_CLK_STATUS2_REG 0x5F
+
+#define IT66121_AUD_CTRL0_REG 0xE0
+#define IT66121_AUD_SWL (3 << 6)
+#define IT66121_AUD_16BIT (0 << 6)
+#define IT66121_AUD_18BIT BIT(6)
+#define IT66121_AUD_20BIT (2 << 6)
+#define IT66121_AUD_24BIT (3 << 6)
+#define IT66121_AUD_SPDIFTC BIT(5)
+#define IT66121_AUD_SPDIF BIT(4)
+#define IT66121_AUD_I2S (0 << 4)
+#define IT66121_AUD_EN_I2S3 BIT(3)
+#define IT66121_AUD_EN_I2S2 BIT(2)
+#define IT66121_AUD_EN_I2S1 BIT(1)
+#define IT66121_AUD_EN_I2S0 BIT(0)
+#define IT66121_AUD_CTRL0_AUD_SEL BIT(4)
+
+#define IT66121_AUD_CTRL1_REG 0xE1
+#define IT66121_AUD_FIFOMAP_REG 0xE2
+#define IT66121_AUD_CTRL3_REG 0xE3
+#define IT66121_AUD_SRCVALID_FLAT_REG 0xE4
+#define IT66121_AUD_FLAT_SRC0 BIT(4)
+#define IT66121_AUD_FLAT_SRC1 BIT(5)
+#define IT66121_AUD_FLAT_SRC2 BIT(6)
+#define IT66121_AUD_FLAT_SRC3 BIT(7)
+#define IT66121_AUD_HDAUDIO_REG 0xE5
+
+#define IT66121_AUD_PKT_CTS0_REG 0x130
+#define IT66121_AUD_PKT_CTS1_REG 0x131
+#define IT66121_AUD_PKT_CTS2_REG 0x132
+#define IT66121_AUD_PKT_N0_REG 0x133
+#define IT66121_AUD_PKT_N1_REG 0x134
+#define IT66121_AUD_PKT_N2_REG 0x135
+
+#define IT66121_AUD_CHST_MODE_REG 0x191
+#define IT66121_AUD_CHST_CAT_REG 0x192
+#define IT66121_AUD_CHST_SRCNUM_REG 0x193
+#define IT66121_AUD_CHST_CHTNUM_REG 0x194
+#define IT66121_AUD_CHST_CA_FS_REG 0x198
+#define IT66121_AUD_CHST_OFS_WL_REG 0x199
+
+#define IT66121_AUD_PKT_CTS_CNT0_REG 0x1A0
+#define IT66121_AUD_PKT_CTS_CNT1_REG 0x1A1
+#define IT66121_AUD_PKT_CTS_CNT2_REG 0x1A2
+
+#define IT66121_AUD_FS_22P05K 0x4
+#define IT66121_AUD_FS_44P1K 0x0
+#define IT66121_AUD_FS_88P2K 0x8
+#define IT66121_AUD_FS_176P4K 0xC
+#define IT66121_AUD_FS_24K 0x6
+#define IT66121_AUD_FS_48K 0x2
+#define IT66121_AUD_FS_96K 0xA
+#define IT66121_AUD_FS_192K 0xE
+#define IT66121_AUD_FS_768K 0x9
+#define IT66121_AUD_FS_32K 0x3
+#define IT66121_AUD_FS_OTHER 0x1
+
+#define IT66121_AUD_SWL_21BIT 0xD
+#define IT66121_AUD_SWL_24BIT 0xB
+#define IT66121_AUD_SWL_23BIT 0x9
+#define IT66121_AUD_SWL_22BIT 0x5
+#define IT66121_AUD_SWL_20BIT 0x3
+#define IT66121_AUD_SWL_17BIT 0xC
+#define IT66121_AUD_SWL_19BIT 0x8
+#define IT66121_AUD_SWL_18BIT 0x4
+#define IT66121_AUD_SWL_16BIT 0x2
+#define IT66121_AUD_SWL_NOT_INDICATED 0x0
+
+#define IT66121_VENDOR_ID0 0x54
+#define IT66121_VENDOR_ID1 0x49
+#define IT66121_DEVICE_ID0 0x12
+#define IT66121_DEVICE_ID1 0x06
+#define IT66121_DEVICE_MASK 0x0F
#define IT66121_AFE_CLK_HIGH 80000 /* Khz */
struct it66121_ctx {
@@ -216,6 +304,13 @@ struct it66121_ctx {
u32 bus_width;
struct mutex lock; /* Protects fields below and device registers */
struct hdmi_avi_infoframe hdmi_avi_infoframe;
+ struct {
+ struct platform_device *pdev;
+ u8 ch_enable;
+ u8 fs;
+ u8 swl;
+ bool auto_cts;
+ } audio;
};
static const struct regmap_range_cfg it66121_regmap_banks[] = {
@@ -886,6 +981,536 @@ static irqreturn_t it66121_irq_threaded_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int it661221_set_chstat(struct it66121_ctx *ctx, u8 iec60958_chstat[])
+{
+ int ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CHST_MODE_REG, iec60958_chstat[0] & 0x7C);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CHST_CAT_REG, iec60958_chstat[1]);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CHST_SRCNUM_REG, iec60958_chstat[2] & 0x0F);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CHST_CHTNUM_REG,
+ (iec60958_chstat[2] >> 4) & 0x0F);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CHST_CA_FS_REG, iec60958_chstat[3]);
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, IT66121_AUD_CHST_OFS_WL_REG, iec60958_chstat[4]);
+}
+
+static int it661221_set_lpcm_audio(struct it66121_ctx *ctx, u8 audio_src_num, u8 audio_swl)
+{
+ int ret;
+ unsigned int audio_enable = 0;
+ unsigned int audio_format = 0;
+
+ switch (audio_swl) {
+ case 16:
+ audio_enable |= IT66121_AUD_16BIT;
+ break;
+ case 18:
+ audio_enable |= IT66121_AUD_18BIT;
+ break;
+ case 20:
+ audio_enable |= IT66121_AUD_20BIT;
+ break;
+ case 24:
+ default:
+ audio_enable |= IT66121_AUD_24BIT;
+ break;
+ }
+
+ audio_format |= 0x40;
+ switch (audio_src_num) {
+ case 4:
+ audio_enable |= IT66121_AUD_EN_I2S3 | IT66121_AUD_EN_I2S2 |
+ IT66121_AUD_EN_I2S1 | IT66121_AUD_EN_I2S0;
+ break;
+ case 3:
+ audio_enable |= IT66121_AUD_EN_I2S2 | IT66121_AUD_EN_I2S1 |
+ IT66121_AUD_EN_I2S0;
+ break;
+ case 2:
+ audio_enable |= IT66121_AUD_EN_I2S1 | IT66121_AUD_EN_I2S0;
+ break;
+ case 1:
+ default:
+ audio_format &= ~0x40;
+ audio_enable |= IT66121_AUD_EN_I2S0;
+ break;
+ }
+
+ audio_format |= 0x01;
+ ctx->audio.ch_enable = audio_enable;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CTRL0_REG, audio_enable & 0xF0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CTRL1_REG, audio_format);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_FIFOMAP_REG, 0xE4);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CTRL3_REG, 0x00);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_SRCVALID_FLAT_REG, 0x00);
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, IT66121_AUD_HDAUDIO_REG, 0x00);
+}
+
+static int it661221_set_ncts(struct it66121_ctx *ctx, u8 fs)
+{
+ int ret;
+ unsigned int n;
+
+ switch (fs) {
+ case IT66121_AUD_FS_32K:
+ n = 4096;
+ break;
+ case IT66121_AUD_FS_44P1K:
+ n = 6272;
+ break;
+ case IT66121_AUD_FS_48K:
+ n = 6144;
+ break;
+ case IT66121_AUD_FS_88P2K:
+ n = 12544;
+ break;
+ case IT66121_AUD_FS_96K:
+ n = 12288;
+ break;
+ case IT66121_AUD_FS_176P4K:
+ n = 25088;
+ break;
+ case IT66121_AUD_FS_192K:
+ n = 24576;
+ break;
+ case IT66121_AUD_FS_768K:
+ n = 24576;
+ break;
+ default:
+ n = 6144;
+ break;
+ }
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_PKT_N0_REG, (u8)((n) & 0xFF));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_PKT_N1_REG, (u8)((n >> 8) & 0xFF));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_PKT_N2_REG, (u8)((n >> 16) & 0xF));
+ if (ret)
+ return ret;
+
+ if (ctx->audio.auto_cts) {
+ u8 loop_cnt = 255;
+ u8 cts_stable_cnt = 0;
+ unsigned int sum_cts = 0;
+ unsigned int cts = 0;
+ unsigned int last_cts = 0;
+ unsigned int diff;
+ unsigned int val;
+
+ while (loop_cnt--) {
+ msleep(30);
+ regmap_read(ctx->regmap, IT66121_AUD_PKT_CTS_CNT2_REG, &val);
+ cts = val << 12;
+ regmap_read(ctx->regmap, IT66121_AUD_PKT_CTS_CNT1_REG, &val);
+ cts |= val << 4;
+ regmap_read(ctx->regmap, IT66121_AUD_PKT_CTS_CNT0_REG, &val);
+ cts |= val >> 4;
+ if (cts == 0) {
+ continue;
+ } else {
+ if (last_cts > cts)
+ diff = last_cts - cts;
+ else
+ diff = cts - last_cts;
+ last_cts = cts;
+ if (diff < 5) {
+ cts_stable_cnt++;
+ sum_cts += cts;
+ } else {
+ cts_stable_cnt = 0;
+ sum_cts = 0;
+ continue;
+ }
+
+ if (cts_stable_cnt >= 32) {
+ last_cts = (sum_cts >> 5);
+ break;
+ }
+ }
+ }
+
+ regmap_write(ctx->regmap, IT66121_AUD_PKT_CTS0_REG, (u8)((last_cts) & 0xFF));
+ regmap_write(ctx->regmap, IT66121_AUD_PKT_CTS1_REG, (u8)((last_cts >> 8) & 0xFF));
+ regmap_write(ctx->regmap, IT66121_AUD_PKT_CTS2_REG, (u8)((last_cts >> 16) & 0x0F));
+ }
+
+ ret = regmap_write(ctx->regmap, 0xF8, 0xC3);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, 0xF8, 0xA5);
+ if (ret)
+ return ret;
+
+ if (ctx->audio.auto_cts) {
+ ret = regmap_write_bits(ctx->regmap, IT66121_PKT_CTS_CTRL_REG,
+ IT66121_PKT_CTS_CTRL_SEL,
+ 1);
+ } else {
+ ret = regmap_write_bits(ctx->regmap, IT66121_PKT_CTS_CTRL_REG,
+ IT66121_PKT_CTS_CTRL_SEL,
+ 0);
+ }
+
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, 0xF8, 0xFF);
+}
+
+static int it661221_audio_output_enable(struct it66121_ctx *ctx, bool enable)
+{
+ int ret;
+
+ if (enable) {
+ ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
+ IT66121_SW_RST_AUD | IT66121_SW_RST_AREF,
+ 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AUD_CTRL0_REG,
+ IT66121_AUD_EN_I2S3 | IT66121_AUD_EN_I2S2 |
+ IT66121_AUD_EN_I2S1 | IT66121_AUD_EN_I2S0,
+ ctx->audio.ch_enable);
+ } else {
+ ret = regmap_write_bits(ctx->regmap, IT66121_AUD_CTRL0_REG,
+ IT66121_AUD_EN_I2S3 | IT66121_AUD_EN_I2S2 |
+ IT66121_AUD_EN_I2S1 | IT66121_AUD_EN_I2S0,
+ ctx->audio.ch_enable & 0xF0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
+ IT66121_SW_RST_AUD | IT66121_SW_RST_AREF,
+ IT66121_SW_RST_AUD | IT66121_SW_RST_AREF);
+ }
+
+ return ret;
+}
+
+static int it661221_audio_ch_enable(struct it66121_ctx *ctx, bool enable)
+{
+ int ret;
+
+ if (enable) {
+ ret = regmap_write(ctx->regmap, IT66121_AUD_SRCVALID_FLAT_REG, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CTRL0_REG, ctx->audio.ch_enable);
+ } else {
+ ret = regmap_write(ctx->regmap, IT66121_AUD_CTRL0_REG, ctx->audio.ch_enable & 0xF0);
+ }
+
+ return ret;
+}
+
+static int it66121_audio_hw_params(struct device *dev, void *data,
+ struct hdmi_codec_daifmt *daifmt,
+ struct hdmi_codec_params *params)
+{
+ u8 fs;
+ u8 swl;
+ int ret;
+ struct it66121_ctx *ctx = dev_get_drvdata(dev);
+ static u8 iec60958_chstat[5];
+ unsigned int channels = params->channels;
+ unsigned int sample_rate = params->sample_rate;
+ unsigned int sample_width = params->sample_width;
+
+ mutex_lock(&ctx->lock);
+ dev_dbg(dev, "%s: %u, %u, %u, %u\n", __func__,
+ daifmt->fmt, sample_rate, sample_width, channels);
+
+ switch (daifmt->fmt) {
+ case HDMI_I2S:
+ dev_dbg(dev, "Using HDMI I2S\n");
+ break;
+ default:
+ dev_err(dev, "Invalid or unsupported DAI format %d\n", daifmt->fmt);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ // Set audio clock recovery (N/CTS)
+ ret = regmap_write(ctx->regmap, IT66121_CLK_CTRL0_REG,
+ IT66121_CLK_CTRL0_AUTO_OVER_SAMPLING |
+ IT66121_CLK_CTRL0_EXT_MCLK_256FS |
+ IT66121_CLK_CTRL0_AUTO_IPCLK);
+ if (ret)
+ goto out;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AUD_CTRL0_REG,
+ IT66121_AUD_CTRL0_AUD_SEL, 0); // remove spdif selection
+ if (ret)
+ goto out;
+
+ switch (sample_rate) {
+ case 44100L:
+ fs = IT66121_AUD_FS_44P1K;
+ break;
+ case 88200L:
+ fs = IT66121_AUD_FS_88P2K;
+ break;
+ case 176400L:
+ fs = IT66121_AUD_FS_176P4K;
+ break;
+ case 32000L:
+ fs = IT66121_AUD_FS_32K;
+ break;
+ case 48000L:
+ fs = IT66121_AUD_FS_48K;
+ break;
+ case 96000L:
+ fs = IT66121_AUD_FS_96K;
+ break;
+ case 192000L:
+ fs = IT66121_AUD_FS_192K;
+ break;
+ case 768000L:
+ fs = IT66121_AUD_FS_768K;
+ break;
+ default:
+ fs = IT66121_AUD_FS_48K;
+ break;
+ }
+
+ ctx->audio.fs = fs;
+ ret = it661221_set_ncts(ctx, fs);
+ if (ret) {
+ dev_err(dev, "Failed to set N/CTS: %d\n", ret);
+ goto out;
+ }
+
+ // Set audio format register (except audio channel enable)
+ ret = it661221_set_lpcm_audio(ctx, (channels + 1) / 2, sample_width);
+ if (ret) {
+ dev_err(dev, "Failed to set LPCM audio: %d\n", ret);
+ goto out;
+ }
+
+ // Set audio channel status
+ iec60958_chstat[0] = 0;
+ if ((channels + 1) / 2 == 1)
+ iec60958_chstat[0] |= 0x1;
+ iec60958_chstat[0] &= ~(1 << 1);
+ iec60958_chstat[1] = 0;
+ iec60958_chstat[2] = (channels + 1) / 2;
+ iec60958_chstat[2] |= (channels << 4) & 0xF0;
+ iec60958_chstat[3] = fs;
+
+ switch (sample_width) {
+ case 21L:
+ swl = IT66121_AUD_SWL_21BIT;
+ break;
+ case 24L:
+ swl = IT66121_AUD_SWL_24BIT;
+ break;
+ case 23L:
+ swl = IT66121_AUD_SWL_23BIT;
+ break;
+ case 22L:
+ swl = IT66121_AUD_SWL_22BIT;
+ break;
+ case 20L:
+ swl = IT66121_AUD_SWL_20BIT;
+ break;
+ case 17L:
+ swl = IT66121_AUD_SWL_17BIT;
+ break;
+ case 19L:
+ swl = IT66121_AUD_SWL_19BIT;
+ break;
+ case 18L:
+ swl = IT66121_AUD_SWL_18BIT;
+ break;
+ case 16L:
+ swl = IT66121_AUD_SWL_16BIT;
+ break;
+ default:
+ swl = IT66121_AUD_SWL_NOT_INDICATED;
+ break;
+ }
+
+ iec60958_chstat[4] = (((~fs) << 4) & 0xF0) | swl;
+ ret = it661221_set_chstat(ctx, iec60958_chstat);
+ if (ret) {
+ dev_err(dev, "Failed to set channel status: %d\n", ret);
+ goto out;
+ }
+
+ // Enable audio channel enable while input clock stable (if SPDIF).
+ ret = it661221_audio_ch_enable(ctx, true);
+ if (ret) {
+ dev_err(dev, "Failed to enable audio channel: %d\n", ret);
+ goto out;
+ }
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_INT_MASK1_REG,
+ IT66121_INT_MASK1_AUD_OVF,
+ 0);
+ if (ret)
+ goto out;
+
+ dev_dbg(dev, "HDMI audio enabled.\n");
+out:
+ mutex_unlock(&ctx->lock);
+
+ return ret;
+}
+
+static int it66121_audio_startup(struct device *dev, void *data)
+{
+ int ret;
+ struct it66121_ctx *ctx = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ mutex_lock(&ctx->lock);
+ ret = it661221_audio_output_enable(ctx, true);
+ if (ret)
+ dev_err(dev, "Failed to enable audio output: %d\n", ret);
+
+ mutex_unlock(&ctx->lock);
+
+ return ret;
+}
+
+static void it66121_audio_shutdown(struct device *dev, void *data)
+{
+ int ret;
+ struct it66121_ctx *ctx = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ mutex_lock(&ctx->lock);
+ ret = it661221_audio_output_enable(ctx, false);
+ if (ret)
+ dev_err(dev, "Failed to disable audio output: %d\n", ret);
+
+ mutex_unlock(&ctx->lock);
+}
+
+static int it66121_audio_mute(struct device *dev, void *data,
+ bool enable, int direction)
+{
+ int ret;
+ struct it66121_ctx *ctx = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "%s: enable=%s, direction=%d\n",
+ __func__, enable ? "true" : "false", direction);
+
+ mutex_lock(&ctx->lock);
+
+ if (enable) {
+ ret = regmap_write_bits(ctx->regmap, IT66121_AUD_SRCVALID_FLAT_REG,
+ IT66121_AUD_FLAT_SRC0 | IT66121_AUD_FLAT_SRC1 |
+ IT66121_AUD_FLAT_SRC2 | IT66121_AUD_FLAT_SRC3,
+ IT66121_AUD_FLAT_SRC0 | IT66121_AUD_FLAT_SRC1 |
+ IT66121_AUD_FLAT_SRC2 | IT66121_AUD_FLAT_SRC3);
+ } else {
+ ret = regmap_write_bits(ctx->regmap, IT66121_AUD_SRCVALID_FLAT_REG,
+ IT66121_AUD_FLAT_SRC0 | IT66121_AUD_FLAT_SRC1 |
+ IT66121_AUD_FLAT_SRC2 | IT66121_AUD_FLAT_SRC3,
+ 0);
+ }
+
+ mutex_unlock(&ctx->lock);
+
+ return ret;
+}
+
+static int it66121_audio_get_eld(struct device *dev, void *data,
+ u8 *buf, size_t len)
+{
+ struct it66121_ctx *ctx = dev_get_drvdata(dev);
+
+ mutex_lock(&ctx->lock);
+
+ memcpy(buf, ctx->connector->eld,
+ min(sizeof(ctx->connector->eld), len));
+
+ mutex_unlock(&ctx->lock);
+
+ return 0;
+}
+
+static const struct hdmi_codec_ops it66121_audio_codec_ops = {
+ .hw_params = it66121_audio_hw_params,
+ .audio_startup = it66121_audio_startup,
+ .audio_shutdown = it66121_audio_shutdown,
+ .mute_stream = it66121_audio_mute,
+ .get_eld = it66121_audio_get_eld,
+ .no_capture_mute = 1,
+};
+
+static int it66121_audio_codec_init(struct it66121_ctx *ctx, struct device *dev)
+{
+ struct hdmi_codec_pdata codec_data = {
+ .ops = &it66121_audio_codec_ops,
+ .i2s = 1, /* Only i2s support for now */
+ .spdif = 0,
+ .max_i2s_channels = 8,
+ };
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
+ dev_info(dev, "No \"#sound-dai-cells\", no audio\n");
+ return 0;
+ }
+
+ ctx->audio.pdev = platform_device_register_data(dev,
+ HDMI_CODEC_DRV_NAME,
+ PLATFORM_DEVID_AUTO,
+ &codec_data,
+ sizeof(codec_data));
+
+ if (IS_ERR(ctx->audio.pdev)) {
+ dev_err(dev, "Failed to initialize HDMI audio codec: %d\n",
+ PTR_ERR_OR_ZERO(ctx->audio.pdev));
+ }
+
+ return PTR_ERR_OR_ZERO(ctx->audio.pdev);
+}
+
static int it66121_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -991,6 +1616,8 @@ static int it66121_probe(struct i2c_client *client,
return ret;
}
+ it66121_audio_codec_init(ctx, dev);
+
drm_bridge_add(&ctx->bridge);
dev_info(ctx->dev, "IT66121 revision %d probed\n", revision_id);
--
2.25.1
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