diff options
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_hdmi_common.c')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c new file mode 100644 index 000000000000..e78eb0876f16 --- /dev/null +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c @@ -0,0 +1,456 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2014 MediaTek Inc. + * Copyright (c) 2024 Collabora Ltd. + * AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> + */ + +#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]; +}; + +/* Recommended N values from HDMI specification, tables 7-1 to 7-3 */ +static const struct hdmi_acr_n hdmi_rec_n_table[] = { + /* Clock, N: 32kHz 44.1kHz 48kHz */ + { 25175, { 4576, 7007, 6864 } }, + { 74176, { 11648, 17836, 11648 } }, + { 148352, { 11648, 8918, 5824 } }, + { 296703, { 5824, 4459, 5824 } }, + { 297000, { 3072, 4704, 5120 } }, + { 0, { 4096, 6272, 6144 } }, /* all other TMDS clocks */ +}; + +/** + * hdmi_recommended_n() - Return N value recommended by HDMI specification + * @freq: audio sample rate in Hz + * @clock: rounded TMDS clock in kHz + */ +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; /* 25.2/1.001 MHz */ + case 74176: + return 74175824; /* 74.25/1.001 MHz */ + case 148352: + return 148351648; /* 148.5/1.001 MHz */ + case 296703: + return 296703297; /* 297/1.001 MHz */ + 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; + + /* The CEC module handles HDMI hotplug detection */ + 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; + + /* + * The mediatek,syscon-hdmi property contains a phandle link to the + * MMSYS_CONFIG device and the register offset of the HDMI_SYS_CFG + * registers it contains. + */ + 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) + 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->next_bridge = of_drm_find_bridge(remote); + if (!hdmi->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_infoframe && + ver_conf->bridge_funcs->hdmi_clear_infoframe) + hdmi->bridge.ops |= DRM_BRIDGE_OP_HDMI; + + 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"); |