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drm: rockchip: add sound support to rk3066 hdmi driver 
Add sound support to the rk3066 HDMI driver.

The I2S input of the HDMI TX allows transmission of
DVD-Audio and decoded Dolby Digital
to A/V Receivers and high-end displays.
The interface supports 2 to 8 channels audio up to 192 kHz.
The HDMI TX supports variable word length of
16bits to 32bits for I2S audio inputs.(This driver 24bit max)
There are three I2S input modes supported.(This driver HDMI_I2S only)
On RK3066/PX2 the HDMI TX audio source is connected to I2S_8CH.

Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
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@intel-lab-lkp
Zheng Yang authored and intel-lab-lkp committed Nov 17, 2020
1 parent f2ade6d commit 4fd170243d9bc7618270dff969e138b05db0f945
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Showing 2 changed files with 273 additions and 1 deletion.
2 drivers/gpu/drm/rockchip/Kconfig
View file
@@ -11,6 +11,8 @@ config DRM_ROCKCHIP
select DRM_DW_MIPI_DSI if ROCKCHIP_DW_MIPI_DSI
select DRM_RGB if ROCKCHIP_RGB
select SND_SOC_HDMI_CODEC if ROCKCHIP_CDN_DP && SND_SOC
select SND_SOC_HDMI_CODEC if ROCKCHIP_RK3066_HDMI && SND_SOC
select SND_SOC_ROCKCHIP_I2S if ROCKCHIP_RK3066_HDMI && SND_SOC
help
Choose this option if you have a Rockchip soc chipset.
This driver provides kernel mode setting and buffer
272 drivers/gpu/drm/rockchip/rk3066_hdmi.c
View file
@@ -13,16 +13,25 @@
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <sound/hdmi-codec.h>

#include "rk3066_hdmi.h"

#include "rockchip_drm_drv.h"
#include "rockchip_drm_vop.h"

#define DEFAULT_PLLA_RATE 30000000

struct audio_info {
int sample_rate;
int channels;
int sample_width;
};

struct hdmi_data_info {
int vic; /* The CEA Video ID (VIC) of the current drm display mode. */
bool sink_is_hdmi;
bool sink_has_audio;
unsigned int enc_out_format;
unsigned int colorimetry;
};
@@ -54,12 +63,19 @@ struct rk3066_hdmi {

unsigned int tmdsclk;

struct platform_device *audio_pdev;
bool audio_enable;

struct hdmi_data_info hdmi_data;
struct audio_info audio;
struct drm_display_mode previous_mode;
};

#define to_rk3066_hdmi(x) container_of(x, struct rk3066_hdmi, x)

static int
rk3066_hdmi_config_audio(struct rk3066_hdmi *hdmi, struct audio_info *audio);

static inline u8 hdmi_readb(struct rk3066_hdmi *hdmi, u16 offset)
{
return readl_relaxed(hdmi->regs + offset);
@@ -205,6 +221,20 @@ static int rk3066_hdmi_config_avi(struct rk3066_hdmi *hdmi,
HDMI_INFOFRAME_AVI, 0, 0, 0);
}

static int rk3066_hdmi_config_aai(struct rk3066_hdmi *hdmi,
struct audio_info *audio)
{
struct hdmi_audio_infoframe *faudio;
union hdmi_infoframe frame;
int rc;

rc = hdmi_audio_infoframe_init(&frame.audio);
faudio = (struct hdmi_audio_infoframe *)&frame;

return rk3066_hdmi_upload_frame(hdmi, rc, &frame,
HDMI_INFOFRAME_AAI, 0, 0, 0);
}

static int rk3066_hdmi_config_video_timing(struct rk3066_hdmi *hdmi,
struct drm_display_mode *mode)
{
@@ -353,6 +383,7 @@ static int rk3066_hdmi_setup(struct rk3066_hdmi *hdmi,
hdmi_modb(hdmi, HDMI_HDCP_CTRL, HDMI_VIDEO_MODE_MASK,
HDMI_VIDEO_MODE_HDMI);
rk3066_hdmi_config_avi(hdmi, mode);
rk3066_hdmi_config_audio(hdmi, &hdmi->audio);
} else {
hdmi_modb(hdmi, HDMI_HDCP_CTRL, HDMI_VIDEO_MODE_MASK, 0);
}
@@ -369,9 +400,20 @@ static int rk3066_hdmi_setup(struct rk3066_hdmi *hdmi,
*/
rk3066_hdmi_i2c_init(hdmi);

/* Unmute video output. */
/* Unmute video and audio output. */
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_VIDEO_AUDIO_DISABLE_MASK, HDMI_AUDIO_DISABLE);
if (hdmi->audio_enable) {
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2, HDMI_AUDIO_DISABLE, 0);
/* Reset audio capture logic. */
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_AUDIO_CP_LOGIC_RESET_MASK,
HDMI_AUDIO_CP_LOGIC_RESET);
usleep_range(900, 1000);
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_AUDIO_CP_LOGIC_RESET_MASK, 0);
}

return 0;
}

@@ -473,9 +515,13 @@ static int rk3066_hdmi_connector_get_modes(struct drm_connector *connector)
edid = drm_get_edid(connector, hdmi->ddc);
if (edid) {
hdmi->hdmi_data.sink_is_hdmi = drm_detect_hdmi_monitor(edid);
hdmi->hdmi_data.sink_has_audio = drm_detect_monitor_audio(edid);
drm_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
} else {
hdmi->hdmi_data.sink_is_hdmi = true;
hdmi->hdmi_data.sink_has_audio = true;
}

return ret;
@@ -535,6 +581,228 @@ struct drm_connector_helper_funcs rk3066_hdmi_connector_helper_funcs = {
.best_encoder = rk3066_hdmi_connector_best_encoder,
};

static int
rk3066_hdmi_config_audio(struct rk3066_hdmi *hdmi, struct audio_info *audio)
{
u32 rate, channel, word_length, N, CTS;
u64 tmp;

if (audio->channels < 3)
channel = HDMI_AUDIO_I2S_CHANNEL_1_2;
else if (audio->channels < 5)
channel = HDMI_AUDIO_I2S_CHANNEL_3_4;
else if (audio->channels < 7)
channel = HDMI_AUDIO_I2S_CHANNEL_5_6;
else
channel = HDMI_AUDIO_I2S_CHANNEL_7_8;

switch (audio->sample_rate) {
case 32000:
rate = HDMI_AUDIO_SAMPLE_FRE_32000;
N = N_32K;
break;
case 44100:
rate = HDMI_AUDIO_SAMPLE_FRE_44100;
N = N_441K;
break;
case 48000:
rate = HDMI_AUDIO_SAMPLE_FRE_48000;
N = N_48K;
break;
case 88200:
rate = HDMI_AUDIO_SAMPLE_FRE_88200;
N = N_882K;
break;
case 96000:
rate = HDMI_AUDIO_SAMPLE_FRE_96000;
N = N_96K;
break;
case 176400:
rate = HDMI_AUDIO_SAMPLE_FRE_176400;
N = N_1764K;
break;
case 192000:
rate = HDMI_AUDIO_SAMPLE_FRE_192000;
N = N_192K;
break;
default:
DRM_DEV_ERROR(hdmi->dev, "no support for sample rate %d\n",
audio->sample_rate);
return -ENOENT;
}

switch (audio->sample_width) {
case 16:
word_length = 0x02;
break;
case 20:
word_length = 0x0a;
break;
case 24:
word_length = 0x0b;
break;
default:
DRM_DEV_ERROR(hdmi->dev, "no support for word length %d\n",
audio->sample_width);
return -ENOENT;
}

tmp = (u64)hdmi->tmdsclk * N;
do_div(tmp, 128 * audio->sample_rate);
CTS = tmp;

/* Set_audio source I2S. */
hdmi_writeb(hdmi, HDMI_AUDIO_CTRL1, 0x00);
hdmi_writeb(hdmi, HDMI_AUDIO_CTRL2, 0x40);
hdmi_writeb(hdmi, HDMI_I2S_AUDIO_CTRL,
HDMI_AUDIO_I2S_FORMAT_STANDARD | channel);
hdmi_writeb(hdmi, HDMI_I2S_SWAP, 0x00);
hdmi_modb(hdmi, HDMI_AV_CTRL1, HDMI_AUDIO_SAMPLE_FRE_MASK, rate);
hdmi_writeb(hdmi, HDMI_AUDIO_SRC_NUM_AND_LENGTH, word_length);

/* Set N value. */
hdmi_modb(hdmi, HDMI_LR_SWAP_N3,
HDMI_AUDIO_N_19_16_MASK, (N >> 16) & 0x0F);
hdmi_writeb(hdmi, HDMI_N2, (N >> 8) & 0xFF);
hdmi_writeb(hdmi, HDMI_N1, N & 0xFF);

/* Set CTS value. */
hdmi_writeb(hdmi, HDMI_CTS_EXT1, CTS & 0xff);
hdmi_writeb(hdmi, HDMI_CTS_EXT2, (CTS >> 8) & 0xff);
hdmi_writeb(hdmi, HDMI_CTS_EXT3, (CTS >> 16) & 0xff);

if (audio->channels > 2)
hdmi_modb(hdmi, HDMI_LR_SWAP_N3,
HDMI_AUDIO_LR_SWAP_MASK,
HDMI_AUDIO_LR_SWAP_SUBPACKET1);
rate = (~(rate >> 4)) & 0x0f;
hdmi_writeb(hdmi, HDMI_AUDIO_STA_BIT_CTRL1, rate);
hdmi_writeb(hdmi, HDMI_AUDIO_STA_BIT_CTRL2, 0);

return rk3066_hdmi_config_aai(hdmi, audio);
}

static int rk3066_hdmi_audio_hw_params(struct device *dev, void *d,
struct hdmi_codec_daifmt *daifmt,
struct hdmi_codec_params *params)
{
struct rk3066_hdmi *hdmi = dev_get_drvdata(dev);

if (!hdmi->hdmi_data.sink_has_audio) {
DRM_DEV_ERROR(hdmi->dev, "no audio support\n");
return -ENODEV;
}

if (!hdmi->encoder.crtc)
return -ENODEV;

switch (daifmt->fmt) {
case HDMI_I2S:
break;
default:
DRM_DEV_ERROR(dev, "invalid format %d\n", daifmt->fmt);
return -EINVAL;
}

hdmi->audio.sample_width = params->sample_width;
hdmi->audio.sample_rate = params->sample_rate;
hdmi->audio.channels = params->channels;

return rk3066_hdmi_config_audio(hdmi, &hdmi->audio);
}

static void rk3066_hdmi_audio_shutdown(struct device *dev, void *d)
{
/* do nothing */
}

static int
rk3066_hdmi_audio_mute_stream(struct device *dev, void *d,
bool mute, int direction)
{
struct rk3066_hdmi *hdmi = dev_get_drvdata(dev);

if (!hdmi->hdmi_data.sink_has_audio) {
DRM_DEV_ERROR(hdmi->dev, "no audio support\n");
return -ENODEV;
}

hdmi->audio_enable = !mute;

if (mute)
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_AUDIO_DISABLE, HDMI_AUDIO_DISABLE);
else
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2, HDMI_AUDIO_DISABLE, 0);

/*
* Under power mode E we need to reset the audio capture logic to
* make the audio setting update.
*/
if (rk3066_hdmi_get_power_mode(hdmi) == HDMI_SYS_POWER_MODE_E) {
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_AUDIO_CP_LOGIC_RESET_MASK,
HDMI_AUDIO_CP_LOGIC_RESET);
usleep_range(900, 1000);
hdmi_modb(hdmi, HDMI_VIDEO_CTRL2,
HDMI_AUDIO_CP_LOGIC_RESET_MASK, 0);
}

return 0;
}

static int rk3066_hdmi_audio_get_eld(struct device *dev, void *d,
u8 *buf, size_t len)
{
struct rk3066_hdmi *hdmi = dev_get_drvdata(dev);
struct drm_mode_config *config = &hdmi->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 (&hdmi->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 = rk3066_hdmi_audio_hw_params,
.audio_shutdown = rk3066_hdmi_audio_shutdown,
.mute_stream = rk3066_hdmi_audio_mute_stream,
.get_eld = rk3066_hdmi_audio_get_eld,
.no_capture_mute = 1,
};

static int rk3066_hdmi_audio_codec_init(struct rk3066_hdmi *hdmi,
struct device *dev)
{
struct hdmi_codec_pdata codec_data = {
.i2s = 1,
.ops = &audio_codec_ops,
.max_i2s_channels = 8,
};

hdmi->audio.channels = 2;
hdmi->audio.sample_rate = 48000;
hdmi->audio.sample_width = 16;
hdmi->audio_enable = false;
hdmi->audio_pdev =
platform_device_register_data(dev,
HDMI_CODEC_DRV_NAME,
PLATFORM_DEVID_NONE,
&codec_data,
sizeof(codec_data));

return PTR_ERR_OR_ZERO(hdmi->audio_pdev);
}

static int
rk3066_hdmi_register(struct drm_device *drm, struct rk3066_hdmi *hdmi)
{
@@ -567,6 +835,8 @@ rk3066_hdmi_register(struct drm_device *drm, struct rk3066_hdmi *hdmi)

drm_connector_attach_encoder(&hdmi->connector, encoder);

rk3066_hdmi_audio_codec_init(hdmi, dev);

return 0;
}

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