diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/sii902x.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/sii902x.c | 1182 |
1 files changed, 1182 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c new file mode 100644 index 000000000..6359d6f53 --- /dev/null +++ b/drivers/gpu/drm/bridge/sii902x.c @@ -0,0 +1,1182 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018 Renesas Electronics + * + * Copyright (C) 2016 Atmel + * Bo Shen <voice.shen@atmel.com> + * + * Authors: Bo Shen <voice.shen@atmel.com> + * Boris Brezillon <boris.brezillon@free-electrons.com> + * Wu, Songjun <Songjun.Wu@atmel.com> + * + * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +#include <linux/gpio/consumer.h> +#include <linux/i2c-mux.h> +#include <linux/i2c.h> +#include <linux/media-bus-format.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/clk.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_drv.h> +#include <drm/drm_edid.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> + +#include <sound/hdmi-codec.h> + +#define SII902X_TPI_VIDEO_DATA 0x0 + +#define SII902X_TPI_PIXEL_REPETITION 0x8 +#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5) +#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4) +#define SII902X_TPI_AVI_PIXEL_REP_4X 3 +#define SII902X_TPI_AVI_PIXEL_REP_2X 1 +#define SII902X_TPI_AVI_PIXEL_REP_NONE 0 +#define SII902X_TPI_CLK_RATIO_HALF (0 << 6) +#define SII902X_TPI_CLK_RATIO_1X (1 << 6) +#define SII902X_TPI_CLK_RATIO_2X (2 << 6) +#define SII902X_TPI_CLK_RATIO_4X (3 << 6) + +#define SII902X_TPI_AVI_IN_FORMAT 0x9 +#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7) +#define SII902X_TPI_AVI_INPUT_DITHER BIT(6) +#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2) +#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2) +#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2) +#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0) +#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0) +#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0) +#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0) + +#define SII902X_TPI_AVI_INFOFRAME 0x0c + +#define SII902X_SYS_CTRL_DATA 0x1a +#define SII902X_SYS_CTRL_PWR_DWN BIT(4) +#define SII902X_SYS_CTRL_AV_MUTE BIT(3) +#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2) +#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1) +#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0) +#define SII902X_SYS_CTRL_OUTPUT_HDMI 1 +#define SII902X_SYS_CTRL_OUTPUT_DVI 0 + +#define SII902X_REG_CHIPID(n) (0x1b + (n)) + +#define SII902X_PWR_STATE_CTRL 0x1e +#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) +#define SII902X_PLUGGED_STATUS BIT(2) + +#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 + +#define SII902X_AUDIO_PORT_INDEX 3 + +struct sii902x { + struct i2c_client *i2c; + struct regmap *regmap; + struct drm_bridge bridge; + struct drm_bridge *next_bridge; + struct drm_connector connector; + struct gpio_desc *reset_gpio; + struct i2c_mux_core *i2cmux; + bool sink_is_hdmi; + /* + * 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) +{ + union i2c_smbus_data data; + int ret; + + ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, + I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data); + + if (ret < 0) + return ret; + + *val = data.byte; + return 0; +} + +static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val) +{ + union i2c_smbus_data data; + + data.byte = val; + + return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, + I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA, + &data); +} + +static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask, + u8 val) +{ + int ret; + u8 status; + + ret = sii902x_read_unlocked(i2c, reg, &status); + if (ret) + return ret; + status &= ~mask; + status |= val & mask; + return sii902x_write_unlocked(i2c, reg, status); +} + +static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge) +{ + return container_of(bridge, struct sii902x, bridge); +} + +static inline struct sii902x *connector_to_sii902x(struct drm_connector *con) +{ + return container_of(con, struct sii902x, connector); +} + +static void sii902x_reset(struct sii902x *sii902x) +{ + if (!sii902x->reset_gpio) + return; + + gpiod_set_value(sii902x->reset_gpio, 1); + + /* The datasheet says treset-min = 100us. Make it 150us to be sure. */ + usleep_range(150, 200); + + gpiod_set_value(sii902x->reset_gpio, 0); +} + +static enum drm_connector_status sii902x_detect(struct sii902x *sii902x) +{ + unsigned int status; + + mutex_lock(&sii902x->mutex); + + regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); + + mutex_unlock(&sii902x->mutex); + + return (status & SII902X_PLUGGED_STATUS) ? + connector_status_connected : connector_status_disconnected; +} + +static enum drm_connector_status +sii902x_connector_detect(struct drm_connector *connector, bool force) +{ + struct sii902x *sii902x = connector_to_sii902x(connector); + + return sii902x_detect(sii902x); +} + +static const struct drm_connector_funcs sii902x_connector_funcs = { + .detect = sii902x_connector_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static struct edid *sii902x_get_edid(struct sii902x *sii902x, + struct drm_connector *connector) +{ + struct edid *edid; + + mutex_lock(&sii902x->mutex); + + edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]); + if (edid) { + if (drm_detect_hdmi_monitor(edid)) + sii902x->sink_is_hdmi = true; + else + sii902x->sink_is_hdmi = false; + } + + mutex_unlock(&sii902x->mutex); + + return edid; +} + +static int sii902x_get_modes(struct drm_connector *connector) +{ + struct sii902x *sii902x = connector_to_sii902x(connector); + struct edid *edid; + int num = 0; + + edid = sii902x_get_edid(sii902x, connector); + drm_connector_update_edid_property(connector, edid); + if (edid) { + num = drm_add_edid_modes(connector, edid); + kfree(edid); + } + + return num; +} + +static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + /* TODO: check mode */ + + return MODE_OK; +} + +static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = { + .get_modes = sii902x_get_modes, + .mode_valid = sii902x_mode_valid, +}; + +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, + const struct drm_display_mode *mode, + const struct drm_display_mode *adj) +{ + struct sii902x *sii902x = bridge_to_sii902x(bridge); + u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI; + struct regmap *regmap = sii902x->regmap; + u8 buf[HDMI_INFOFRAME_SIZE(AVI)]; + struct hdmi_avi_infoframe frame; + u16 pixel_clock_10kHz = adj->clock / 10; + int ret; + + if (sii902x->sink_is_hdmi) + output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI; + + buf[0] = pixel_clock_10kHz & 0xff; + buf[1] = pixel_clock_10kHz >> 8; + buf[2] = drm_mode_vrefresh(adj); + buf[3] = 0x00; + buf[4] = adj->hdisplay; + buf[5] = adj->hdisplay >> 8; + buf[6] = adj->vdisplay; + buf[7] = adj->vdisplay >> 8; + buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE | + SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT; + buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO | + SII902X_TPI_AVI_INPUT_COLORSPACE_RGB; + + mutex_lock(&sii902x->mutex); + + ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_OUTPUT_MODE, output_mode); + if (ret) + goto out; + + ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10); + if (ret) + goto out; + + ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, + &sii902x->connector, adj); + if (ret < 0) { + DRM_ERROR("couldn't fill AVI infoframe\n"); + goto out; + } + + ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf)); + if (ret < 0) { + DRM_ERROR("failed to pack AVI infoframe: %d\n", ret); + 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, + enum drm_bridge_attach_flags flags) +{ + struct sii902x *sii902x = bridge_to_sii902x(bridge); + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; + struct drm_device *drm = bridge->dev; + int ret; + + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) + return drm_bridge_attach(bridge->encoder, sii902x->next_bridge, + bridge, flags); + + drm_connector_helper_add(&sii902x->connector, + &sii902x_connector_helper_funcs); + + if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) { + dev_err(&sii902x->i2c->dev, + "sii902x driver is only compatible with DRM devices supporting atomic updates\n"); + return -ENOTSUPP; + } + + ret = drm_connector_init(drm, &sii902x->connector, + &sii902x_connector_funcs, + DRM_MODE_CONNECTOR_HDMIA); + if (ret) + return ret; + + if (sii902x->i2c->irq > 0) + sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD; + else + sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT; + + ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info, + &bus_format, 1); + if (ret) + return ret; + + drm_connector_attach_encoder(&sii902x->connector, bridge->encoder); + + return 0; +} + +static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge) +{ + struct sii902x *sii902x = bridge_to_sii902x(bridge); + + return sii902x_detect(sii902x); +} + +static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + struct sii902x *sii902x = bridge_to_sii902x(bridge); + + return sii902x_get_edid(sii902x, connector); +} + +static const struct drm_bridge_funcs sii902x_bridge_funcs = { + .attach = sii902x_bridge_attach, + .mode_set = sii902x_bridge_mode_set, + .disable = sii902x_bridge_disable, + .enable = sii902x_bridge_enable, + .detect = sii902x_bridge_detect, + .get_edid = sii902x_bridge_get_edid, +}; + +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 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) +{ + 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]); + + if (d >= distance) + continue; + + nearest = i; + distance = d; + if (d == 0) + break; + } + + *i2s_config_reg |= nearest << 4; + + return sii902x_mclk_div_table[nearest]; +} + +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_provider || daifmt->frame_clk_provider) { + dev_dbg(dev, "%s: I2S clock provider 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; + } + + if (sii902x->audio.mclk) { + mclk_rate = clk_get_rate(sii902x->audio.mclk); + 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); + } + + 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; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) && + sii902x->audio.i2s_fifo_sequence[i]; 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); +} + +static int sii902x_audio_mute(struct device *dev, void *data, + bool enable, int direction) +{ + 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)); + + mutex_unlock(&sii902x->mutex); + + return 0; +} + +static int sii902x_audio_get_dai_id(struct snd_soc_component *component, + struct device_node *endpoint) +{ + struct of_endpoint of_ep; + int ret; + + ret = of_graph_parse_endpoint(endpoint, &of_ep); + if (ret < 0) + return ret; + + /* + * HDMI sound should be located at reg = <3> + * Return expected DAI index 0. + */ + if (of_ep.port == SII902X_AUDIO_PORT_INDEX) + return 0; + + return -EINVAL; +} + +static const struct hdmi_codec_ops sii902x_audio_codec_ops = { + .hw_params = sii902x_audio_hw_params, + .audio_shutdown = sii902x_audio_shutdown, + .mute_stream = sii902x_audio_mute, + .get_eld = sii902x_audio_get_eld, + .get_dai_id = sii902x_audio_get_dai_id, + .no_capture_mute = 1, +}; + +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]; + int num_lanes, i; + + if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) { + dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n", + __func__); + return 0; + } + + num_lanes = of_property_read_variable_u8_array(dev->of_node, + "sil,i2s-data-lanes", + lanes, 1, + ARRAY_SIZE(lanes)); + + if (num_lanes == -EINVAL) { + dev_dbg(dev, + "%s: No \"sil,i2s-data-lanes\", use default <0>\n", + __func__); + num_lanes = 1; + lanes[0] = 0; + } else if (num_lanes < 0) { + dev_err(dev, + "%s: Error gettin \"sil,i2s-data-lanes\": %d\n", + __func__, num_lanes); + return num_lanes; + } + 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; + + sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk"); + if (IS_ERR(sii902x->audio.mclk)) { + dev_err(dev, "%s: No clock (audio mclk) found: %ld\n", + __func__, PTR_ERR(sii902x->audio.mclk)); + return PTR_ERR(sii902x->audio.mclk); + } + + 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 }, +}; + +static const struct regmap_access_table sii902x_volatile_table = { + .yes_ranges = sii902x_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges), +}; + +static const struct regmap_config sii902x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .disable_locking = true, /* struct sii902x mutex should be enough */ + .max_register = SII902X_TPI_MISC_INFOFRAME_END, + .volatile_table = &sii902x_volatile_table, + .cache_type = REGCACHE_NONE, +}; + +static irqreturn_t sii902x_interrupt(int irq, void *data) +{ + struct sii902x *sii902x = data; + unsigned int status = 0; + + mutex_lock(&sii902x->mutex); + + regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); + regmap_write(sii902x->regmap, SII902X_INT_STATUS, status); + + mutex_unlock(&sii902x->mutex); + + if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) { + drm_helper_hpd_irq_event(sii902x->bridge.dev); + drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS) + ? connector_status_connected + : connector_status_disconnected); + } + + return IRQ_HANDLED; +} + +/* + * The purpose of sii902x_i2c_bypass_select is to enable the pass through + * mode of the HDMI transmitter. Do not use regmap from within this function, + * only use sii902x_*_unlocked functions to read/modify/write registers. + * We are holding the parent adapter lock here, keep this in mind before + * adding more i2c transactions. + * + * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere + * in this driver, we need to make sure that we only touch 0x1A[2:1] from + * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that + * we leave the remaining bits as we have found them. + */ +static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) +{ + struct sii902x *sii902x = i2c_mux_priv(mux); + struct device *dev = &sii902x->i2c->dev; + unsigned long timeout; + u8 status; + int ret; + + ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_DDC_BUS_REQ, + SII902X_SYS_CTRL_DDC_BUS_REQ); + if (ret) + return ret; + + timeout = jiffies + + msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + if (ret) + return ret; + } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) && + time_before(jiffies, timeout)); + + if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) { + dev_err(dev, "Failed to acquire the i2c bus\n"); + return -ETIMEDOUT; + } + + return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + status); +} + +/* + * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through + * mode of the HDMI transmitter. Do not use regmap from within this function, + * only use sii902x_*_unlocked functions to read/modify/write registers. + * We are holding the parent adapter lock here, keep this in mind before + * adding more i2c transactions. + * + * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere + * in this driver, we need to make sure that we only touch 0x1A[2:1] from + * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that + * we leave the remaining bits as we have found them. + */ +static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) +{ + struct sii902x *sii902x = i2c_mux_priv(mux); + struct device *dev = &sii902x->i2c->dev; + unsigned long timeout; + unsigned int retries; + u8 status; + int ret; + + /* + * When the HDMI transmitter is in pass through mode, we need an + * (undocumented) additional delay between STOP and START conditions + * to guarantee the bus won't get stuck. + */ + udelay(30); + + /* + * Sometimes the I2C bus can stall after failure to use the + * EDID channel. Retry a few times to see if things clear + * up, else continue anyway. + */ + retries = 5; + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + retries--; + } while (ret && retries); + if (ret) { + dev_err(dev, "failed to read status (%d)\n", ret); + return ret; + } + + ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD, 0); + if (ret) + return ret; + + timeout = jiffies + + msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); + do { + ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, + &status); + if (ret) + return ret; + } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD) && + time_before(jiffies, timeout)); + + if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | + SII902X_SYS_CTRL_DDC_BUS_GRTD)) { + dev_err(dev, "failed to release the i2c bus\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static const struct drm_bridge_timings default_sii902x_timings = { + .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE + | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE + | DRM_BUS_FLAG_DE_HIGH, +}; + +static int sii902x_init(struct sii902x *sii902x) +{ + struct device *dev = &sii902x->i2c->dev; + unsigned int status = 0; + u8 chipid[4]; + int ret; + + sii902x_reset(sii902x); + + ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0); + if (ret) + return ret; + + ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0), + &chipid, 4); + if (ret) { + dev_err(dev, "regmap_read failed %d\n", ret); + return ret; + } + + if (chipid[0] != 0xb0) { + dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n", + chipid[0]); + return -EINVAL; + } + + /* Clear all pending interrupts */ + regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); + regmap_write(sii902x->regmap, SII902X_INT_STATUS, status); + + if (sii902x->i2c->irq > 0) { + regmap_write(sii902x->regmap, SII902X_INT_ENABLE, + SII902X_HOTPLUG_EVENT); + + ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL, + sii902x_interrupt, + IRQF_ONESHOT, dev_name(dev), + sii902x); + if (ret) + return ret; + } + + ret = sii902x_audio_codec_init(sii902x, dev); + if (ret) + return ret; + + i2c_set_clientdata(sii902x->i2c, sii902x); + + sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev, + 1, 0, I2C_MUX_GATE, + sii902x_i2c_bypass_select, + sii902x_i2c_bypass_deselect); + if (!sii902x->i2cmux) { + ret = -ENOMEM; + goto err_unreg_audio; + } + + sii902x->i2cmux->priv = sii902x; + ret = i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0); + if (ret) + goto err_unreg_audio; + + sii902x->bridge.funcs = &sii902x_bridge_funcs; + sii902x->bridge.of_node = dev->of_node; + sii902x->bridge.timings = &default_sii902x_timings; + sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID; + + if (sii902x->i2c->irq > 0) + sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD; + + drm_bridge_add(&sii902x->bridge); + + return 0; + +err_unreg_audio: + if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev)) + platform_device_unregister(sii902x->audio.pdev); + + return ret; +} + +static int sii902x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device_node *endpoint; + struct sii902x *sii902x; + static const char * const supplies[] = {"iovcc", "cvcc12"}; + int ret; + + ret = i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA); + if (!ret) { + dev_err(dev, "I2C adapter not suitable\n"); + return -EIO; + } + + sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL); + if (!sii902x) + return -ENOMEM; + + sii902x->i2c = client; + sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config); + if (IS_ERR(sii902x->regmap)) + return PTR_ERR(sii902x->regmap); + + sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(sii902x->reset_gpio)) { + dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n", + PTR_ERR(sii902x->reset_gpio)); + return PTR_ERR(sii902x->reset_gpio); + } + + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1); + if (endpoint) { + struct device_node *remote = of_graph_get_remote_port_parent(endpoint); + + of_node_put(endpoint); + if (!remote) { + dev_err(dev, "Endpoint in port@1 unconnected\n"); + return -ENODEV; + } + + if (!of_device_is_available(remote)) { + dev_err(dev, "port@1 remote device is disabled\n"); + of_node_put(remote); + return -ENODEV; + } + + sii902x->next_bridge = of_drm_find_bridge(remote); + of_node_put(remote); + if (!sii902x->next_bridge) + return -EPROBE_DEFER; + } + + mutex_init(&sii902x->mutex); + + ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to enable supplies"); + + return sii902x_init(sii902x); +} + +static void sii902x_remove(struct i2c_client *client) +{ + struct sii902x *sii902x = i2c_get_clientdata(client); + + drm_bridge_remove(&sii902x->bridge); + i2c_mux_del_adapters(sii902x->i2cmux); + + if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev)) + platform_device_unregister(sii902x->audio.pdev); +} + +static const struct of_device_id sii902x_dt_ids[] = { + { .compatible = "sil,sii9022", }, + { } +}; +MODULE_DEVICE_TABLE(of, sii902x_dt_ids); + +static const struct i2c_device_id sii902x_i2c_ids[] = { + { "sii9022", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids); + +static struct i2c_driver sii902x_driver = { + .probe = sii902x_probe, + .remove = sii902x_remove, + .driver = { + .name = "sii902x", + .of_match_table = sii902x_dt_ids, + }, + .id_table = sii902x_i2c_ids, +}; +module_i2c_driver(sii902x_driver); + +MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); +MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges"); +MODULE_LICENSE("GPL"); |