#include <drm/drm_modes.h>
#include <linux/device.h>
#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/math.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
#include <sound/hdmi-codec.h>
#include "mtk_hdmi_common.h"
struct hdmi_acr_n {
unsigned int clock;
unsigned int n[3];
};
static const struct hdmi_acr_n hdmi_rec_n_table[] = {
{ 25175, { 4576, 7007, 6864 } },
{ 74176, { 11648, 17836, 11648 } },
{ 148352, { 11648, 8918, 5824 } },
{ 296703, { 5824, 4459, 5824 } },
{ 297000, { 3072, 4704, 5120 } },
{ 0, { 4096, 6272, 6144 } },
};
static unsigned int hdmi_recommended_n(unsigned int freq, unsigned int clock)
{
const struct hdmi_acr_n *recommended;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(hdmi_rec_n_table) - 1; i++) {
if (clock == hdmi_rec_n_table[i].clock)
break;
}
recommended = hdmi_rec_n_table + i;
switch (freq) {
case 32000:
return recommended->n[0];
case 44100:
return recommended->n[1];
case 48000:
return recommended->n[2];
case 88200:
return recommended->n[1] * 2;
case 96000:
return recommended->n[2] * 2;
case 176400:
return recommended->n[1] * 4;
case 192000:
return recommended->n[2] * 4;
default:
return (128 * freq) / 1000;
}
}
static unsigned int hdmi_mode_clock_to_hz(unsigned int clock)
{
switch (clock) {
case 25175:
return 25174825;
case 74176:
return 74175824;
case 148352:
return 148351648;
case 296703:
return 296703297;
default:
return clock * 1000;
}
}
static unsigned int hdmi_expected_cts(unsigned int audio_sample_rate,
unsigned int tmds_clock, unsigned int n)
{
return DIV_ROUND_CLOSEST_ULL((u64)hdmi_mode_clock_to_hz(tmds_clock) * n,
128 * audio_sample_rate);
}
void mtk_hdmi_get_ncts(unsigned int sample_rate, unsigned int clock,
unsigned int *n, unsigned int *cts)
{
*n = hdmi_recommended_n(sample_rate, clock);
*cts = hdmi_expected_cts(sample_rate, clock, *n);
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_get_ncts, "DRM_MTK_HDMI");
int mtk_hdmi_audio_params(struct mtk_hdmi *hdmi,
struct hdmi_codec_daifmt *daifmt,
struct hdmi_codec_params *params)
{
struct hdmi_audio_param aud_params = { 0 };
unsigned int chan = params->cea.channels;
dev_dbg(hdmi->dev, "%s: %u Hz, %d bit, %d channels\n", __func__,
params->sample_rate, params->sample_width, chan);
if (!hdmi->bridge.encoder)
return -ENODEV;
switch (chan) {
case 2:
aud_params.aud_input_chan_type = HDMI_AUD_CHAN_TYPE_2_0;
break;
case 4:
aud_params.aud_input_chan_type = HDMI_AUD_CHAN_TYPE_4_0;
break;
case 6:
aud_params.aud_input_chan_type = HDMI_AUD_CHAN_TYPE_5_1;
break;
case 8:
aud_params.aud_input_chan_type = HDMI_AUD_CHAN_TYPE_7_1;
break;
default:
dev_err(hdmi->dev, "channel[%d] not supported!\n", chan);
return -EINVAL;
}
switch (params->sample_rate) {
case 32000:
case 44100:
case 48000:
case 88200:
case 96000:
case 176400:
case 192000:
break;
default:
dev_err(hdmi->dev, "rate[%d] not supported!\n",
params->sample_rate);
return -EINVAL;
}
switch (daifmt->fmt) {
case HDMI_I2S:
aud_params.aud_codec = HDMI_AUDIO_CODING_TYPE_PCM;
aud_params.aud_sample_size = HDMI_AUDIO_SAMPLE_SIZE_16;
aud_params.aud_input_type = HDMI_AUD_INPUT_I2S;
aud_params.aud_i2s_fmt = HDMI_I2S_MODE_I2S_24BIT;
aud_params.aud_mclk = HDMI_AUD_MCLK_128FS;
break;
case HDMI_SPDIF:
aud_params.aud_codec = HDMI_AUDIO_CODING_TYPE_PCM;
aud_params.aud_sample_size = HDMI_AUDIO_SAMPLE_SIZE_16;
aud_params.aud_input_type = HDMI_AUD_INPUT_SPDIF;
break;
default:
dev_err(hdmi->dev, "%s: Invalid DAI format %d\n", __func__,
daifmt->fmt);
return -EINVAL;
}
memcpy(&aud_params.codec_params, params, sizeof(aud_params.codec_params));
memcpy(&hdmi->aud_param, &aud_params, sizeof(aud_params));
dev_dbg(hdmi->dev, "codec:%d, input:%d, channel:%d, fs:%d\n",
aud_params.aud_codec, aud_params.aud_input_type,
aud_params.aud_input_chan_type, aud_params.codec_params.sample_rate);
return 0;
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_audio_params, "DRM_MTK_HDMI");
int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf, size_t len)
{
struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
if (hdmi->enabled)
memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
else
memset(buf, 0, len);
return 0;
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_audio_get_eld, "DRM_MTK_HDMI");
void mtk_hdmi_audio_set_plugged_cb(struct mtk_hdmi *hdmi, hdmi_codec_plugged_cb fn,
struct device *codec_dev)
{
mutex_lock(&hdmi->update_plugged_status_lock);
hdmi->plugged_cb = fn;
hdmi->codec_dev = codec_dev;
mutex_unlock(&hdmi->update_plugged_status_lock);
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_audio_set_plugged_cb, "DRM_MTK_HDMI");
static int mtk_hdmi_get_all_clk(struct mtk_hdmi *hdmi, struct device_node *np,
const char * const *clock_names, size_t num_clocks)
{
int i;
for (i = 0; i < num_clocks; i++) {
hdmi->clk[i] = of_clk_get_by_name(np, clock_names[i]);
if (IS_ERR(hdmi->clk[i]))
return PTR_ERR(hdmi->clk[i]);
}
return 0;
}
bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
return true;
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_bridge_mode_fixup, "DRM_MTK_HDMI");
void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
dev_dbg(hdmi->dev, "cur info: name:%s, hdisplay:%d\n",
adjusted_mode->name, adjusted_mode->hdisplay);
dev_dbg(hdmi->dev, "hsync_start:%d,hsync_end:%d, htotal:%d",
adjusted_mode->hsync_start, adjusted_mode->hsync_end,
adjusted_mode->htotal);
dev_dbg(hdmi->dev, "hskew:%d, vdisplay:%d\n",
adjusted_mode->hskew, adjusted_mode->vdisplay);
dev_dbg(hdmi->dev, "vsync_start:%d, vsync_end:%d, vtotal:%d",
adjusted_mode->vsync_start, adjusted_mode->vsync_end,
adjusted_mode->vtotal);
dev_dbg(hdmi->dev, "vscan:%d, flag:%d\n",
adjusted_mode->vscan, adjusted_mode->flags);
drm_mode_copy(&hdmi->mode, adjusted_mode);
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_bridge_mode_set, "DRM_MTK_HDMI");
static void mtk_hdmi_put_device(void *_dev)
{
struct device *dev = _dev;
put_device(dev);
}
static int mtk_hdmi_get_cec_dev(struct mtk_hdmi *hdmi, struct device *dev, struct device_node *np)
{
struct platform_device *cec_pdev;
struct device_node *cec_np;
int ret;
cec_np = of_get_compatible_child(np->parent, "mediatek,mt8173-cec");
if (!cec_np)
return dev_err_probe(dev, -EOPNOTSUPP, "Failed to find CEC node\n");
cec_pdev = of_find_device_by_node(cec_np);
if (!cec_pdev) {
dev_err(hdmi->dev, "Waiting for CEC device %pOF\n", cec_np);
of_node_put(cec_np);
return -EPROBE_DEFER;
}
of_node_put(cec_np);
ret = devm_add_action_or_reset(dev, mtk_hdmi_put_device, &cec_pdev->dev);
if (ret)
return ret;
hdmi->sys_regmap = syscon_regmap_lookup_by_phandle_args(np, "mediatek,syscon-hdmi",
1, &hdmi->sys_offset);
if (IS_ERR(hdmi->sys_regmap))
return dev_err_probe(dev, PTR_ERR(hdmi->sys_regmap),
"Failed to get system configuration registers\n");
hdmi->cec_dev = &cec_pdev->dev;
return 0;
}
static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
const char * const *clk_names, size_t num_clocks)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *remote, *i2c_np;
int ret;
ret = mtk_hdmi_get_all_clk(hdmi, np, clk_names, num_clocks);
if (ret)
return dev_err_probe(dev, ret, "Failed to get clocks\n");
hdmi->irq = platform_get_irq(pdev, 0);
if (hdmi->irq < 0)
return hdmi->irq;
hdmi->regs = device_node_to_regmap(dev->of_node);
if (IS_ERR(hdmi->regs))
return PTR_ERR(hdmi->regs);
remote = of_graph_get_remote_node(np, 1, 0);
if (!remote)
return -EINVAL;
if (!of_device_is_compatible(remote, "hdmi-connector")) {
hdmi->bridge.next_bridge = of_drm_find_and_get_bridge(remote);
if (!hdmi->bridge.next_bridge) {
dev_err(dev, "Waiting for external bridge\n");
of_node_put(remote);
return -EPROBE_DEFER;
}
}
i2c_np = of_parse_phandle(remote, "ddc-i2c-bus", 0);
of_node_put(remote);
if (!i2c_np)
return dev_err_probe(dev, -EINVAL, "No ddc-i2c-bus in connector\n");
hdmi->ddc_adpt = of_find_i2c_adapter_by_node(i2c_np);
of_node_put(i2c_np);
if (!hdmi->ddc_adpt)
return dev_err_probe(dev, -EPROBE_DEFER, "Failed to get ddc i2c adapter by node\n");
ret = devm_add_action_or_reset(dev, mtk_hdmi_put_device, &hdmi->ddc_adpt->dev);
if (ret)
return ret;
ret = mtk_hdmi_get_cec_dev(hdmi, dev, np);
if (ret == -EOPNOTSUPP)
dev_info(dev, "CEC support unavailable: node not found\n");
else if (ret)
return ret;
return 0;
}
static void mtk_hdmi_unregister_audio_driver(void *data)
{
platform_device_unregister(data);
}
static int mtk_hdmi_register_audio_driver(struct device *dev)
{
struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
struct hdmi_audio_param *aud_param = &hdmi->aud_param;
struct hdmi_codec_pdata codec_data = {
.ops = hdmi->conf->ver_conf->codec_ops,
.max_i2s_channels = 2,
.i2s = 1,
.data = hdmi,
.no_capture_mute = 1,
};
int ret;
aud_param->aud_codec = HDMI_AUDIO_CODING_TYPE_PCM;
aud_param->aud_sample_size = HDMI_AUDIO_SAMPLE_SIZE_16;
aud_param->aud_input_type = HDMI_AUD_INPUT_I2S;
aud_param->aud_i2s_fmt = HDMI_I2S_MODE_I2S_24BIT;
aud_param->aud_mclk = HDMI_AUD_MCLK_128FS;
aud_param->aud_input_chan_type = HDMI_AUD_CHAN_TYPE_2_0;
hdmi->audio_pdev = platform_device_register_data(dev,
HDMI_CODEC_DRV_NAME,
PLATFORM_DEVID_AUTO,
&codec_data,
sizeof(codec_data));
if (IS_ERR(hdmi->audio_pdev))
return PTR_ERR(hdmi->audio_pdev);
ret = devm_add_action_or_reset(dev, mtk_hdmi_unregister_audio_driver,
hdmi->audio_pdev);
if (ret)
return ret;
return 0;
}
struct mtk_hdmi *mtk_hdmi_common_probe(struct platform_device *pdev)
{
const struct mtk_hdmi_ver_conf *ver_conf;
const struct mtk_hdmi_conf *hdmi_conf;
struct device *dev = &pdev->dev;
struct mtk_hdmi *hdmi;
int ret;
hdmi_conf = of_device_get_match_data(dev);
if (!hdmi_conf)
return ERR_PTR(-ENODEV);
ver_conf = hdmi_conf->ver_conf;
hdmi = devm_drm_bridge_alloc(dev, struct mtk_hdmi, bridge,
ver_conf->bridge_funcs);
if (IS_ERR(hdmi))
return hdmi;
hdmi->dev = dev;
hdmi->conf = hdmi_conf;
hdmi->clk = devm_kcalloc(dev, ver_conf->num_clocks, sizeof(*hdmi->clk), GFP_KERNEL);
if (!hdmi->clk)
return ERR_PTR(-ENOMEM);
ret = mtk_hdmi_dt_parse_pdata(hdmi, pdev, ver_conf->mtk_hdmi_clock_names,
ver_conf->num_clocks);
if (ret)
return ERR_PTR(ret);
hdmi->phy = devm_phy_get(dev, "hdmi");
if (IS_ERR(hdmi->phy))
return dev_err_cast_probe(dev, hdmi->phy, "Failed to get HDMI PHY\n");
mutex_init(&hdmi->update_plugged_status_lock);
platform_set_drvdata(pdev, hdmi);
ret = mtk_hdmi_register_audio_driver(dev);
if (ret)
return dev_err_ptr_probe(dev, ret, "Cannot register HDMI Audio driver\n");
hdmi->bridge.of_node = pdev->dev.of_node;
hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
| DRM_BRIDGE_OP_HPD;
if (ver_conf->bridge_funcs->hdmi_write_avi_infoframe &&
ver_conf->bridge_funcs->hdmi_clear_avi_infoframe)
hdmi->bridge.ops |= DRM_BRIDGE_OP_HDMI |
DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME;
hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
hdmi->bridge.ddc = hdmi->ddc_adpt;
hdmi->bridge.vendor = "MediaTek";
hdmi->bridge.product = "On-Chip HDMI";
hdmi->bridge.interlace_allowed = ver_conf->interlace_allowed;
ret = devm_drm_bridge_add(dev, &hdmi->bridge);
if (ret)
return dev_err_ptr_probe(dev, ret, "Failed to add bridge\n");
return hdmi;
}
EXPORT_SYMBOL_NS_GPL(mtk_hdmi_common_probe, "DRM_MTK_HDMI");
MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
MODULE_DESCRIPTION("MediaTek HDMI Common Library");
MODULE_LICENSE("GPL");
