[PATCH v5 6/6] drm/bridge: sii902x: Implement HDMI audio support
Andrzej Hajda
a.hajda at samsung.com
Fri Apr 12 12:30:34 UTC 2019
On 12.04.2019 13:53, Jyri Sarha wrote:
> On 12/04/2019 11:52, Andrzej Hajda wrote:
>> On 22.03.2019 09:06, Jyri Sarha wrote:
>>> Implement HDMI audio support by using ASoC HDMI codec. The commit
>>> implements the necessary callbacks and configuration for the HDMI
>>> codec and registers a virtual platform device for the codec to attach.
>>>
>>> Signed-off-by: Jyri Sarha <jsarha at ti.com>
>>> ---
>>> drivers/gpu/drm/bridge/sii902x.c | 459 ++++++++++++++++++++++++++++++-
>>> 1 file changed, 453 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
>>> index 358cf81c5ea4..cb12e264111d 100644
>>> --- a/drivers/gpu/drm/bridge/sii902x.c
>>> +++ b/drivers/gpu/drm/bridge/sii902x.c
>>> @@ -27,12 +27,15 @@
>>> #include <linux/i2c.h>
>>> #include <linux/module.h>
>>> #include <linux/regmap.h>
>>> +#include <linux/clk.h>
>>>
>>> #include <drm/drmP.h>
>>> #include <drm/drm_atomic_helper.h>
>>> #include <drm/drm_crtc_helper.h>
>>> #include <drm/drm_edid.h>
>>>
>>> +#include <sound/hdmi-codec.h>
>>> +
>>> #define SII902X_TPI_VIDEO_DATA 0x0
>>>
>>> #define SII902X_TPI_PIXEL_REPETITION 0x8
>>> @@ -74,6 +77,77 @@
>>> #define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
>>> #define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
>>>
>>> +/* Audio */
>>> +#define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f
>>> +#define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0)
>>> +#define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0)
>>> +#define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0)
>>> +#define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0)
>>> +#define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2)
>>> +#define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3)
>>> +#define SII902X_TPI_I2S_SELECT_SD0 (0 << 4)
>>> +#define SII902X_TPI_I2S_SELECT_SD1 (1 << 4)
>>> +#define SII902X_TPI_I2S_SELECT_SD2 (2 << 4)
>>> +#define SII902X_TPI_I2S_SELECT_SD3 (3 << 4)
>>> +#define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7)
>>> +
>>> +#define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20
>>> +#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0)
>>> +#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0)
>>> +#define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1)
>>> +#define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1)
>>> +#define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2)
>>> +#define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2)
>>> +#define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3)
>>> +#define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4)
>>> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4)
>>> +#define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7)
>>> +#define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7)
>>> +
>>> +#define SII902X_TPI_I2S_STRM_HDR_BASE 0x21
>>> +#define SII902X_TPI_I2S_STRM_HDR_SIZE 5
>>> +
>>> +#define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26
>>> +#define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_PCM (1 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_AAC (6 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_DTS (7 << 0)
>>> +#define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0)
>>> +#define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4)
>>> +#define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4)
>>> +#define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5)
>>> +#define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5)
>>> +#define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6)
>>> +#define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6)
>>> +#define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6)
>>> +
>>> +#define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27
>>> +#define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3)
>>> +#define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3)
>>> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6)
>>> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6)
>>> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6)
>>> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6)
>>> +
>>> +#define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28
>>> +
>>> #define SII902X_INT_ENABLE 0x3c
>>> #define SII902X_INT_STATUS 0x3d
>>> #define SII902X_HOTPLUG_EVENT BIT(0)
>>> @@ -81,6 +155,16 @@
>>>
>>> #define SII902X_REG_TPI_RQB 0xc7
>>>
>>> +/* Indirect internal register access */
>>> +#define SII902X_IND_SET_PAGE 0xbc
>>> +#define SII902X_IND_OFFSET 0xbd
>>> +#define SII902X_IND_VALUE 0xbe
>>> +
>>> +#define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf
>>> +#define SII902X_TPI_MISC_INFOFRAME_END 0xde
>>> +#define SII902X_TPI_MISC_INFOFRAME_SIZE \
>>> + (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
>>> +
>>> #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
>>>
>>> struct sii902x {
>>> @@ -90,6 +174,16 @@ struct sii902x {
>>> struct drm_connector connector;
>>> struct gpio_desc *reset_gpio;
>>> struct i2c_mux_core *i2cmux;
>>> + /*
>>> + * Mutex protects audio and video functions from interfering
>>> + * each other, by keeping their i2c command sequences atomic.
>>> + */
>>> + struct mutex mutex;
>>> + struct sii902x_audio {
>>> + struct platform_device *pdev;
>>> + struct clk *mclk;
>>> + u32 i2s_fifo_sequence[4];
>>> + } audio;
>>> };
>>>
>>> static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
>>> @@ -161,8 +255,12 @@ sii902x_connector_detect(struct drm_connector *connector, bool force)
>>> struct sii902x *sii902x = connector_to_sii902x(connector);
>>> unsigned int status;
>>>
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
>>>
>>> + mutex_unlock(&sii902x->mutex);
>>> +
>>
>> regmap uses its own lock so we have here and in other places redundant
>> locks.
>>
>> Probably you should disable regmap locking (config->disable_locking = 1).
>>
> Makes sense. I'll add that.
>
>>> return (status & SII902X_PLUGGED_STATUS) ?
>>> connector_status_connected : connector_status_disconnected;
>>> }
>>> @@ -184,6 +282,8 @@ static int sii902x_get_modes(struct drm_connector *connector)
>>> struct edid *edid;
>>> int num = 0, ret;
>>>
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
>>> drm_connector_update_edid_property(connector, edid);
>>> if (edid) {
>>> @@ -197,14 +297,19 @@ static int sii902x_get_modes(struct drm_connector *connector)
>>> ret = drm_display_info_set_bus_formats(&connector->display_info,
>>> &bus_format, 1);
>>> if (ret)
>>> - return ret;
>>> + goto error_out;
>>>
>>> ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>>> SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
>>> if (ret)
>>> - return ret;
>>> + goto error_out;
>>> +
>>> + ret = num;
>>> +
>>> +error_out:
>>> + mutex_unlock(&sii902x->mutex);
>>>
>>> - return num;
>>> + return ret;
>>> }
>>>
>>> static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
>>> @@ -224,20 +329,28 @@ static void sii902x_bridge_disable(struct drm_bridge *bridge)
>>> {
>>> struct sii902x *sii902x = bridge_to_sii902x(bridge);
>>>
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>>> SII902X_SYS_CTRL_PWR_DWN,
>>> SII902X_SYS_CTRL_PWR_DWN);
>>> +
>>> + mutex_unlock(&sii902x->mutex);
>>> }
>>>
>>> static void sii902x_bridge_enable(struct drm_bridge *bridge)
>>> {
>>> struct sii902x *sii902x = bridge_to_sii902x(bridge);
>>>
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
>>> SII902X_AVI_POWER_STATE_MSK,
>>> SII902X_AVI_POWER_STATE_D(0));
>>> regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>>> SII902X_SYS_CTRL_PWR_DWN, 0);
>>> +
>>> + mutex_unlock(&sii902x->mutex);
>>> }
>>>
>>> static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
>>> @@ -264,26 +377,31 @@ static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
>>> buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
>>> SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
>>>
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
>>> if (ret)
>>> - return;
>>> + goto out;
>>>
>>> ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
>>> if (ret < 0) {
>>> DRM_ERROR("couldn't fill AVI infoframe\n");
>>> - return;
>>> + goto out;
>>> }
>>>
>>> ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
>>> if (ret < 0) {
>>> DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
>>> - return;
>>> + goto out;
>>> }
>>>
>>> /* Do not send the infoframe header, but keep the CRC field. */
>>> regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
>>> buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
>>> HDMI_AVI_INFOFRAME_SIZE + 1);
>>> +
>>> +out:
>>> + mutex_unlock(&sii902x->mutex);
>>> }
>>>
>>> static int sii902x_bridge_attach(struct drm_bridge *bridge)
>>> @@ -324,6 +442,330 @@ static const struct drm_bridge_funcs sii902x_bridge_funcs = {
>>> .enable = sii902x_bridge_enable,
>>> };
>>>
>>> +static int sii902x_mute(struct sii902x *sii902x, bool mute)
>>> +{
>>> + struct device *dev = &sii902x->i2c->dev;
>>> + unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
>>> + SII902X_TPI_AUDIO_MUTE_DISABLE;
>>> +
>>> + dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
>>> +
>>> + return regmap_update_bits(sii902x->regmap,
>>> + SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
>>> + SII902X_TPI_AUDIO_MUTE_ENABLE, val);
>>> +}
>>> +
>>> +static const unsigned int sii902x_mclk_div_table[] = {
>>> + 128, 256, 384, 512, 768, 1024, 1152, 192 };
>>> +
>>> +static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
>>> + unsigned int mclk)
>>> +{
>>> + unsigned int div = mclk / rate;
>>> + int distance = 100000;
>>> + u8 i, nearest = 0;
>>> +
>>> + for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
>>> + unsigned int d = abs(div - sii902x_mclk_div_table[i]);
>>
>> Using unsigned types in this context seems to be asking for troubles.
>>
> Why? Isn't return value of abs() by definition unsigned? Using signed
> integers when comparing absolute distances would seem awkward to me.
(div - sii902x_mclk_div_table[i]) is unsigned, if div is lower, there is overflow, and the value is big int, I suppose this is not what you want.
>
>>> +
>>> + if (d >= distance)
>>> + continue;
>>> +
>>> + nearest = i;
>>> + distance = d;
>>> + if (d == 0)
>>> + break;
>>> + }
>>> +
>>> + *i2s_config_reg |= nearest << 4;
>>> +
>>> + if (distance != 0)
>>> + return sii902x_mclk_div_table[nearest];
>>> +
>>> + return 0;
>>
>> ret value is inconsistent, 0 in case of exact match, closest value
>> otherwise, code will be cleaner if you return always closest match.
>>
> Then I do not have the information to print a warning if an exact match
> was not found. The return value is only used in that warning message,
> the register configuration value is always delivered trough
> *i2s_config_reg. I do not see any inconsistency here.
You have it:
+ ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
+ mclk_rate);
+ if (mclk_rate / ret != params->sample_rate)
+ dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
+ mclk_rate, ret, params->sample_rate);
+
or to avoid division: if (mclk_rate != ret * params->sample_rate) ...
But this is not something I would die for, it just hurts my teeth :)
>
>>> +}
>>> +
>>> +static const struct sii902x_sample_freq {
>>> + u32 freq;
>>> + u8 val;
>>> +} sii902x_sample_freq[] = {
>>> + { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
>>> + { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
>>> + { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
>>> + { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
>>> + { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
>>> + { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
>>> + { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
>>> +};
>>> +
>>> +static int sii902x_audio_hw_params(struct device *dev, void *data,
>>> + struct hdmi_codec_daifmt *daifmt,
>>> + struct hdmi_codec_params *params)
>>> +{
>>> + struct sii902x *sii902x = dev_get_drvdata(dev);
>>> + u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
>>> + u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
>>> + SII902X_TPI_AUDIO_MUTE_ENABLE |
>>> + SII902X_TPI_AUDIO_CODING_PCM);
>>> + u8 config_byte3_reg = 0;
>>> + u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
>>> + unsigned long mclk_rate;
>>> + int i, ret;
>>> +
>>> + if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
>>> + dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + switch (daifmt->fmt) {
>>> + case HDMI_I2S:
>>> + i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
>>> + SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
>>> + break;
>>> + case HDMI_RIGHT_J:
>>> + i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
>>> + break;
>>> + case HDMI_LEFT_J:
>>> + i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
>>> + break;
>>> + default:
>>> + dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
>>> + daifmt->fmt);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + if (daifmt->bit_clk_inv)
>>> + i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
>>> + else
>>> + i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
>>> +
>>> + if (daifmt->frame_clk_inv)
>>> + i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
>>> + else
>>> + i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
>>> +
>>> + if (params->channels > 2)
>>> + config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
>>> + else
>>> + config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
>>> +
>>> + switch (params->sample_width) {
>>> + case 16:
>>> + config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
>>> + break;
>>> + case 20:
>>> + config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
>>> + break;
>>> + case 24:
>>> + case 32:
>>> + config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
>>> + break;
>>> + default:
>>> + dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
>>> + params->sample_width);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
>>> + if (params->sample_rate == sii902x_sample_freq[i].freq) {
>>> + config_byte3_reg |= sii902x_sample_freq[i].val;
>>> + break;
>>> + }
>>> + }
>>> +
>>> + ret = clk_prepare_enable(sii902x->audio.mclk);
>>> + if (ret) {
>>> + dev_err(dev, "Enabling mclk failed: %d\n", ret);
>>> + return ret;
>>> + }
>>> +
>>> + mclk_rate = clk_get_rate(sii902x->audio.mclk);
>>> +
>>> + ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
>>> + mclk_rate);
>>> + if (ret)
>>> + dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
>>> + mclk_rate, ret, params->sample_rate);
>>> +
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> + ret = regmap_write(sii902x->regmap,
>>> + SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
>>> + config_byte2_reg);
>>> + if (ret < 0)
>>> + goto out;
>>> +
>>> + ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
>>> + i2s_config_reg);
>>> + if (ret)
>>> + goto out;
>>> +
>>> + for (i = 0; sii902x->audio.i2s_fifo_sequence[i] &&
>>> + i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence); i++)
>>> + regmap_write(sii902x->regmap,
>>> + SII902X_TPI_I2S_ENABLE_MAPPING_REG,
>>> + sii902x->audio.i2s_fifo_sequence[i]);
>>> +
>>> + ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
>>> + config_byte3_reg);
>>> + if (ret)
>>> + goto out;
>>> +
>>> + ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
>>> + params->iec.status,
>>> + min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
>>> + sizeof(params->iec.status)));
>>> + if (ret)
>>> + goto out;
>>> +
>>> + ret = hdmi_audio_infoframe_pack(¶ms->cea, infoframe_buf,
>>> + sizeof(infoframe_buf));
>>> + if (ret < 0) {
>>> + dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
>>> + __func__, ret);
>>> + goto out;
>>> + }
>>> +
>>> + ret = regmap_bulk_write(sii902x->regmap,
>>> + SII902X_TPI_MISC_INFOFRAME_BASE,
>>> + infoframe_buf,
>>> + min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
>>> + if (ret)
>>> + goto out;
>>> +
>>> + /* Decode Level 0 Packets */
>>> + ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
>>> + if (ret)
>>> + goto out;
>>> +
>>> + ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
>>> + if (ret)
>>> + goto out;
>>> +
>>> + ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
>>> + if (ret)
>>> + goto out;
>>> +
>>> + dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
>>> +out:
>>> + mutex_unlock(&sii902x->mutex);
>>> +
>>> + if (ret) {
>>> + clk_disable_unprepare(sii902x->audio.mclk);
>>> + dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
>>> + ret);
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static void sii902x_audio_shutdown(struct device *dev, void *data)
>>> +{
>>> + struct sii902x *sii902x = dev_get_drvdata(dev);
>>> +
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> + regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
>>> + SII902X_TPI_AUDIO_INTERFACE_DISABLE);
>>> +
>>> + mutex_unlock(&sii902x->mutex);
>>> +
>>> + clk_disable_unprepare(sii902x->audio.mclk);
>>> +}
>>> +
>>> +int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
>>> +{
>>> + struct sii902x *sii902x = dev_get_drvdata(dev);
>>> +
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> + sii902x_mute(sii902x, enable);
>>> +
>>> + mutex_unlock(&sii902x->mutex);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int sii902x_audio_get_eld(struct device *dev, void *data,
>>> + uint8_t *buf, size_t len)
>>> +{
>>> + struct sii902x *sii902x = dev_get_drvdata(dev);
>>> +
>>> + mutex_lock(&sii902x->mutex);
>>> +
>>> + memcpy(buf, sii902x->connector.eld,
>>> + min(sizeof(sii902x->connector.eld), len));
>>
>> I am not familiar with audio stuff, so forgive my ignorance :)
>>
>> What happens when this or other audio callbacks is called:
>>
>> 1. before sth is plugged in connector.
>>> 2. after unplug.
>> 3. plug/un-plug happens between these calls.
>>
> The audio side calls this at the time of audio playback request. If
> there is no valid eld at that time, the playback request fails. The eld
> is only used at the playback start time, never after it.
>
> When an audio playback is running it we do not do anything to until the
> playback is stopped. E.g. if plug/un-plug happens we just keep playing
> with the original configuration (my first version had an abort call back
> to abort playback in unplug event, but that was refused in the reviews).
>
> If the cable is never plugged again, or the new display does not have
> audio support, the i2s just keeps banging the bits to dev null and audio
> data keeps drainging away. When cable is again plugged to audio capable
> display, it continues playing there (and it never stopped in between.
>
> This comes closest to already established behaviour with already
> existing HDMI audio implementations. This is also usually the preferred
> behavior, because resebles how video stream playback behaves.
>
> I know very well that this is not the perfect solution. The perfect
> solution would have the abort callback there, and some mechanism above
> that to deal with the audio playback being aborted and the device
> becoming available again. This would require co-operation from
> userspace. However, the world is not ready and this is a best effort
> implementation.
OK, thanks for explanation.
>
>> Also I do not see hotplug/unplug notification mechanism to audio
>> subsystem. It looks suspicious.
>>
> Yes, as mentioned above, I had it in my first version of hdmi-codec, but
> it was never accepted to mainline. However, in practice this has not
> been a problem. The HDMI audio implementation on the encoder chips I
> have seen is usually quite independent from the video side workings.
>
>> Regards
>>
>> Andrzej
>>
> Thanks,
> Jyri
>
>>
>>> +
>>> + mutex_unlock(&sii902x->mutex);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
>>> + .hw_params = sii902x_audio_hw_params,
>>> + .audio_shutdown = sii902x_audio_shutdown,
>>> + .digital_mute = sii902x_audio_digital_mute,
>>> + .get_eld = sii902x_audio_get_eld,
>>> +};
>>> +
>>> +static int sii902x_audio_codec_init(struct sii902x *sii902x,
>>> + struct device *dev)
>>> +{
>>> + static const u8 audio_fifo_id[] = {
>>> + SII902X_TPI_I2S_CONFIG_FIFO0,
>>> + SII902X_TPI_I2S_CONFIG_FIFO1,
>>> + SII902X_TPI_I2S_CONFIG_FIFO2,
>>> + SII902X_TPI_I2S_CONFIG_FIFO3,
>>> + };
>>> + static const u8 i2s_lane_id[] = {
>>> + SII902X_TPI_I2S_SELECT_SD0,
>>> + SII902X_TPI_I2S_SELECT_SD1,
>>> + SII902X_TPI_I2S_SELECT_SD2,
>>> + SII902X_TPI_I2S_SELECT_SD3,
>>> + };
>>> + struct hdmi_codec_pdata codec_data = {
>>> + .ops = &sii902x_audio_codec_ops,
>>> + .i2s = 1, /* Only i2s support for now. */
>>> + .spdif = 0,
>>> + .max_i2s_channels = 0,
>>> + };
>>> + u8 lanes[4];
>>> + u32 num_lanes, i;
>>> +
>>> + num_lanes = of_property_read_variable_u8_array(dev->of_node,
>>> + "sil,i2s-data-lanes",
>>> + lanes, 1,
>>> + ARRAY_SIZE(lanes));
>>> + if (num_lanes < 0) {
>>> + if (num_lanes == -EINVAL)
>>> + dev_dbg(dev,
>>> + "%s: No \"sil,i2s-data-lanes\", no audio\n",
>>> + __func__);
>>> + else
>>> + dev_err(dev,
>>> + "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
>>> + __func__, num_lanes);
>>> + return 0;
>>> + }
>>> + codec_data.max_i2s_channels = 2 * num_lanes;
>>> +
>>> + for (i = 0; i < num_lanes; i++)
>>> + sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
>>> + i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
>>> +
>>> + if (IS_ERR(sii902x->audio.mclk)) {
>>> + dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
>>> + __func__, PTR_ERR(sii902x->audio.mclk));
>>> + return 0;
>>> + }
>>> +
>>> + sii902x->audio.pdev = platform_device_register_data(
>>> + dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
>>> + &codec_data, sizeof(codec_data));
>>> +
>>> + return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
>>> +}
>>> +
>>> static const struct regmap_range sii902x_volatile_ranges[] = {
>>> { .range_min = 0, .range_max = 0xff },
>>> };
>>> @@ -336,6 +778,7 @@ static const struct regmap_access_table sii902x_volatile_table = {
>>> static const struct regmap_config sii902x_regmap_config = {
>>> .reg_bits = 8,
>>> .val_bits = 8,
>>> + .max_register = SII902X_TPI_MISC_INFOFRAME_END,
>>> .volatile_table = &sii902x_volatile_table,
>>> .cache_type = REGCACHE_NONE,
>>> };
>>> @@ -508,6 +951,8 @@ static int sii902x_probe(struct i2c_client *client,
>>> return PTR_ERR(sii902x->reset_gpio);
>>> }
>>>
>>> + mutex_init(&sii902x->mutex);
>>> +
>>> sii902x_reset(sii902x);
>>>
>>> ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
>>> @@ -548,6 +993,8 @@ static int sii902x_probe(struct i2c_client *client,
>>> sii902x->bridge.timings = &default_sii902x_timings;
>>> drm_bridge_add(&sii902x->bridge);
>>>
>>> + sii902x_audio_codec_init(sii902x, dev);
>>> +
>>> i2c_set_clientdata(client, sii902x);
>>>
>>> sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev,
>>
>
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