From: Sunyun Yang <[email protected]> LT9611C(EX/UXD) is an I2C-controlled chip that Receiver signal/dual port mipi dsi and output hdmi, differences in hardware features: - LT9611C: supports 1-port mipi dsi to hdmi 1.4 - LT9611EX: supports 2-port mipi dsi to hdmi 1.4 - LT9611UXD: supports 2-port mipi dsi to hdmi 1.4/2.0
Signed-off-by: Sunyun Yang <[email protected]> Reviewed-by: Dmitry Baryshkov <[email protected]> --- drivers/gpu/drm/bridge/Kconfig | 18 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt9611c.c | 1241 ++++++++++++++++++++++ 3 files changed, 1260 insertions(+) create mode 100644 drivers/gpu/drm/bridge/lontium-lt9611c.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index c3209b0f4678..32b85a2a65d9 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -177,6 +177,24 @@ config DRM_LONTIUM_LT9611 HDMI signals Please say Y if you have such hardware. +config DRM_LONTIUM_LT9611C + tristate "Lontium LT9611C DSI/HDMI bridge" + select SND_SOC_HDMI_CODEC if SND_SOC + depends on OF + select CRC8 + select FW_LOADER + select DRM_PANEL_BRIDGE + select DRM_KMS_HELPER + select DRM_MIPI_DSI + select DRM_DISPLAY_HELPER + select DRM_DISPLAY_HDMI_STATE_HELPER + select REGMAP_I2C + help + Driver for Lontium DSI to HDMI bridge + chip driver that converts dual DSI and I2S to + HDMI signals + Please say Y if you have such hardware. + config DRM_LONTIUM_LT9611UXC tristate "Lontium LT9611UXC DSI/HDMI bridge" select SND_SOC_HDMI_CODEC if SND_SOC diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index beab5b695a6e..92688be9692f 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o obj-$(CONFIG_DRM_LONTIUM_LT9211) += lontium-lt9211.o obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o +obj-$(CONFIG_DRM_LONTIUM_LT9611C) += lontium-lt9611c.o obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o obj-$(CONFIG_DRM_LONTIUM_LT8713SX) += lontium-lt8713sx.o obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o diff --git a/drivers/gpu/drm/bridge/lontium-lt9611c.c b/drivers/gpu/drm/bridge/lontium-lt9611c.c new file mode 100644 index 000000000000..cb584855fd8f --- /dev/null +++ b/drivers/gpu/drm/bridge/lontium-lt9611c.c @@ -0,0 +1,1241 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2026 Lontium Semiconductor, Inc. + */ + +#include <linux/crc8.h> +#include <linux/firmware.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/media-bus-format.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_connector.h> +#include <drm/drm_drv.h> +#include <drm/drm_edid.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_modes.h> +#include <drm/drm_of.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> +#include <drm/display/drm_hdmi_audio_helper.h> +#include <drm/display/drm_hdmi_state_helper.h> +#include <sound/hdmi-codec.h> + +#define FW_SIZE (64 * 1024) +#define LT_PAGE_SIZE 256 +#define FW_FILE "Lontium/lt9611c_fw.bin" +#define LT9611C_CRC_POLYNOMIAL 0x31 +#define LT9611C_PAGE_CONTROL 0xff + +enum lt9611_chip_type { + CHIP_LT9611C = 0, + CHIP_LT9611EX, + CHIP_LT9611UXD, +}; + +struct lt9611c { + struct device *dev; + struct i2c_client *client; + struct drm_bridge bridge; + struct regmap *regmap; + /* Protects all accesses to registers by stopping the on-chip MCU */ + struct mutex ocm_lock; + struct work_struct work; + struct device_node *dsi0_node; + struct device_node *dsi1_node; + struct mipi_dsi_device *dsi0; + struct mipi_dsi_device *dsi1; + struct gpio_desc *reset_gpio; + struct regulator_bulk_data supplies[2]; + int fw_version; + /* Chip variant: C/EX/UXD */ + enum lt9611_chip_type chip_type; + /* HDMI cable connection status */ + bool hdmi_connected; +}; + +DECLARE_CRC8_TABLE(lt9611c_crc8_table); + +static const struct regmap_range_cfg lt9611c_ranges[] = { + { + .name = "register_range", + .range_min = 0, + .range_max = 0xfe9c, + .selector_reg = LT9611C_PAGE_CONTROL, + .selector_mask = 0xff, + .selector_shift = 0, + .window_start = 0, + .window_len = 0x100, + }, +}; + +static const struct regmap_config lt9611c_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xfe9c, + .ranges = lt9611c_ranges, + .num_ranges = ARRAY_SIZE(lt9611c_ranges), +}; + +static int lt9611c_read_write_flow(struct lt9611c *lt9611c, u8 *params, + unsigned int param_count, u8 *return_buffer, + unsigned int return_count) +{ + int ret; + unsigned int i; + unsigned int temp; + unsigned int max_params = 0xe0dd - 0xe0b0 + 1; + + regmap_write(lt9611c->regmap, 0xe0de, 0x01); + + ret = regmap_read_poll_timeout(lt9611c->regmap, 0xe0ae, temp, + temp == 0x01, 1000, 100 * 1000); + if (ret) + return -ETIMEDOUT; + + for (i = 0; i < param_count && i < max_params; i++) + regmap_write(lt9611c->regmap, 0xe0b0 + i, params[i]); + + regmap_write(lt9611c->regmap, 0xe0de, 0x02); + + ret = regmap_read_poll_timeout(lt9611c->regmap, 0xe0ae, temp, + temp == 0x02, 1000, 100 * 1000); + if (ret) + return -ETIMEDOUT; + + return regmap_bulk_read(lt9611c->regmap, 0xe085, return_buffer, + return_count); +} + +static void lt9611c_config_parameters(struct lt9611c *lt9611c) +{ + const struct reg_sequence seq_write_paras[] = { + REG_SEQ0(0xe0ee, 0x01), + REG_SEQ0(0xe103, 0x3f), /*fifo rst*/ + REG_SEQ0(0xe103, 0xff), + REG_SEQ0(0xe05e, 0xc1), + REG_SEQ0(0xe058, 0x00), + REG_SEQ0(0xe059, 0x50), + REG_SEQ0(0xe05a, 0x10), + REG_SEQ0(0xe05a, 0x00), + REG_SEQ0(0xe058, 0x21), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write_paras, ARRAY_SIZE(seq_write_paras)); +} + +static void lt9611c_wren(struct lt9611c *lt9611c) +{ + regmap_write(lt9611c->regmap, 0xe05a, 0x04); + regmap_write(lt9611c->regmap, 0xe05a, 0x00); +} + +static void lt9611c_wrdi(struct lt9611c *lt9611c) +{ + regmap_write(lt9611c->regmap, 0xe05a, 0x08); + regmap_write(lt9611c->regmap, 0xe05a, 0x00); +} + +static void lt9611c_erase_op(struct lt9611c *lt9611c, u32 addr) +{ + const struct reg_sequence seq_write[] = { + REG_SEQ0(0xe0ee, 0x01), + REG_SEQ0(0xe05a, 0x04), + REG_SEQ0(0xe05a, 0x00), + REG_SEQ0(0xe05b, (addr >> 16) & 0xff), + REG_SEQ0(0xe05c, (addr >> 8) & 0xff), + REG_SEQ0(0xe05d, addr & 0xff), + REG_SEQ0(0xe05a, 0x01), + REG_SEQ0(0xe05a, 0x00), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write, ARRAY_SIZE(seq_write)); +} + +static void read_flash_reg_status(struct lt9611c *lt9611c, unsigned int *status) +{ + const struct reg_sequence seq_write[] = { + REG_SEQ0(0xe103, 0x3f), + REG_SEQ0(0xe103, 0xff), + REG_SEQ0(0xe05e, 0x40), + REG_SEQ0(0xe056, 0x05), + REG_SEQ0(0xe055, 0x25), + REG_SEQ0(0xe055, 0x01), + REG_SEQ0(0xe058, 0x21), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write, ARRAY_SIZE(seq_write)); + + regmap_read(lt9611c->regmap, 0xe05f, status); +} + +static void lt9611c_crc_to_sram(struct lt9611c *lt9611c) +{ + const struct reg_sequence seq_write[] = { + REG_SEQ0(0xe051, 0x00), + REG_SEQ0(0xe055, 0xc0), + REG_SEQ0(0xe055, 0x80), + REG_SEQ0(0xe05e, 0xc0), + REG_SEQ0(0xe058, 0x21), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write, ARRAY_SIZE(seq_write)); +} + +static void lt9611c_data_to_sram(struct lt9611c *lt9611c) +{ + const struct reg_sequence seq_write[] = { + REG_SEQ0(0xe051, 0xff), + REG_SEQ0(0xe055, 0x80), + REG_SEQ0(0xe05e, 0xc0), + REG_SEQ0(0xe058, 0x21), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write, ARRAY_SIZE(seq_write)); +} + +static void lt9611c_sram_to_flash(struct lt9611c *lt9611c, size_t addr) +{ + const struct reg_sequence seq_write[] = { + REG_SEQ0(0xe05b, (addr >> 16) & 0xff), + REG_SEQ0(0xe05c, (addr >> 8) & 0xff), + REG_SEQ0(0xe05d, addr & 0xff), + REG_SEQ0(0xe05a, 0x30), + REG_SEQ0(0xe05a, 0x00), + }; + + regmap_multi_reg_write(lt9611c->regmap, seq_write, ARRAY_SIZE(seq_write)); +} + +static void lt9611c_block_erase(struct lt9611c *lt9611c) +{ + struct device *dev = lt9611c->dev; + int i; + unsigned int block_num; + unsigned int flash_status = 0; + u32 flash_addr = 0; + + for (block_num = 0; block_num < 2; block_num++) { + flash_addr = (block_num * 0x008000); + lt9611c_erase_op(lt9611c, flash_addr); + msleep(100); + i = 0; + while (1) { + read_flash_reg_status(lt9611c, &flash_status); + if ((flash_status & 0x01) == 0) + break; + + if (i > 50) + break; + + i++; + msleep(50); + } + } + + dev_dbg(dev, "erase flash done.\n"); +} + +static int lt9611c_write_data(struct lt9611c *lt9611c, const struct firmware *fw, size_t addr) +{ + struct device *dev = lt9611c->dev; + int ret; + unsigned int page = 0, num = 0, i = 0; + size_t size, index; + const u8 *data; + u8 value; + + data = fw->data; + size = fw->size; + page = (size + LT_PAGE_SIZE - 1) / LT_PAGE_SIZE; + if (page * LT_PAGE_SIZE > FW_SIZE) { + dev_err(dev, "firmware size out of range\n"); + return -EINVAL; + } + + dev_dbg(dev, "%u pages, total size %zu byte\n", page, size); + + for (num = 0; num < page; num++) { + lt9611c_data_to_sram(lt9611c); + + for (i = 0; i < LT_PAGE_SIZE; i++) { + index = num * LT_PAGE_SIZE + i; + value = (index < size) ? data[index] : 0xff; + + ret = regmap_write(lt9611c->regmap, 0xe059, value); + if (ret < 0) { + dev_err(dev, "write error at page %u, index %u\n", num, i); + return ret; + } + } + + lt9611c_wren(lt9611c); + lt9611c_sram_to_flash(lt9611c, addr); + + addr += LT_PAGE_SIZE; + } + + lt9611c_wrdi(lt9611c); + + return 0; +} + +static int lt9611c_write_crc(struct lt9611c *lt9611c, u8 fw_crc, size_t addr) +{ + struct device *dev = lt9611c->dev; + int ret; + + lt9611c_crc_to_sram(lt9611c); + ret = regmap_write(lt9611c->regmap, 0xe059, fw_crc); + if (ret < 0) { + dev_err(dev, "failed to write crc\n"); + return ret; + } + + lt9611c_wren(lt9611c); + lt9611c_sram_to_flash(lt9611c, addr); + lt9611c_wrdi(lt9611c); + + dev_dbg(dev, "crc 0x%02x written to flash at addr 0x%zx\n", fw_crc, addr); + + return 0; +} + +static void lt9611c_reset(struct lt9611c *lt9611c) +{ + gpiod_set_value_cansleep(lt9611c->reset_gpio, 1); + msleep(20); + + gpiod_set_value_cansleep(lt9611c->reset_gpio, 0); + msleep(20); + + gpiod_set_value_cansleep(lt9611c->reset_gpio, 1); + msleep(400); + + dev_dbg(lt9611c->dev, "lt9611c reset"); +} + +static int lt9611c_upgrade_result(struct lt9611c *lt9611c, u8 fw_crc) +{ + struct device *dev = lt9611c->dev; + unsigned int crc_result; + + regmap_write(lt9611c->regmap, 0xe0ee, 0x01); + regmap_read(lt9611c->regmap, 0xe021, &crc_result); + + if (crc_result != fw_crc) { + dev_err(dev, "lt9611c fw upgrade failed, expected crc=0x%02x, read crc=0x%02x\n", + fw_crc, crc_result); + return -1; + } + + dev_dbg(dev, "lt9611c firmware upgrade success, crc=0x%02x\n", crc_result); + return 0; +} + +static int lt9611c_firmware_upgrade(struct lt9611c *lt9611c) +{ + struct device *dev = lt9611c->dev; + const struct firmware *fw; + u8 *buffer; + size_t total_size = FW_SIZE - 1; + u8 fw_crc; + int ret; + + /* 1. load firmware */ + ret = request_firmware(&fw, FW_FILE, dev); + if (ret) + return dev_err_probe(dev, ret, "failed to load '%s'\n", FW_FILE); + + /* 2. check size */ + if (fw->size > total_size) { + dev_err(dev, "firmware too large (%zu > %zu)\n", fw->size, total_size); + ret = -EINVAL; + goto out_release_fw; + } + dev_dbg(dev, "firmware size: %zu bytes\n", fw->size); + + /* 3. calculate crc8 */ + buffer = kzalloc(total_size, GFP_KERNEL); + if (!buffer) { + ret = -ENOMEM; + goto out_release_fw; + } + + memset(buffer, 0xff, total_size); + memcpy(buffer, fw->data, fw->size); + + fw_crc = crc8(lt9611c_crc8_table, buffer, total_size, 0); + kfree(buffer); + + dev_dbg(dev, "firmware crc: 0x%02x\n", fw_crc); + dev_dbg(dev, "starting firmware upgrade, size: %zu bytes\n", fw->size); + + /* 4. firmware upgrade */ + lt9611c_config_parameters(lt9611c); + lt9611c_block_erase(lt9611c); + + ret = lt9611c_write_data(lt9611c, fw, 0); + if (ret < 0) { + dev_err(dev, "failed to write firmware data\n"); + goto out_release_fw; + } + + ret = lt9611c_write_crc(lt9611c, fw_crc, FW_SIZE - 1); + if (ret < 0) { + dev_err(dev, "failed to write firmware crc\n"); + goto out_release_fw; + } + + /* 5. check upgrade of result */ + lt9611c_reset(lt9611c); + ret = lt9611c_upgrade_result(lt9611c, fw_crc); + +out_release_fw: + release_firmware(fw); + return ret; +} + +static struct lt9611c *bridge_to_lt9611c(struct drm_bridge *bridge) +{ + return container_of(bridge, struct lt9611c, bridge); +} + +/*read only*/ +static const struct lt9611c *bridge_to_lt9611c_const(const struct drm_bridge *bridge) +{ + return container_of(bridge, const struct lt9611c, bridge); +} + +static void lt9611c_lock(struct lt9611c *lt9611c) +{ + mutex_lock(<9611c->ocm_lock); + regmap_write(lt9611c->regmap, 0xe0ee, 0x01); +} + +static void lt9611c_unlock(struct lt9611c *lt9611c) +{ + regmap_write(lt9611c->regmap, 0xe0ee, 0x00); + mutex_unlock(<9611c->ocm_lock); +} + +static irqreturn_t lt9611c_irq_thread_handler(int irq, void *dev_id) +{ + struct lt9611c *lt9611c = dev_id; + struct device *dev = lt9611c->dev; + int ret; + unsigned int irq_status; + u8 cmd[5] = {0x52, 0x48, 0x31, 0x3a, 0x00}; + u8 data[5]; + + guard(mutex)(<9611c->ocm_lock); + + ret = regmap_read(lt9611c->regmap, 0xe084, &irq_status); + if (ret) { + dev_err(dev, "failed to read irq status: %d\n", ret); + return IRQ_HANDLED; + } + + if (!(irq_status & BIT(0))) + return IRQ_HANDLED; + + ret = lt9611c_read_write_flow(lt9611c, cmd, ARRAY_SIZE(cmd), data, ARRAY_SIZE(data)); + if (ret) { + dev_err(dev, "failed to read HPD status\n"); + } else { + lt9611c->hdmi_connected = (data[4] == 0x02); + dev_dbg(dev, "HDMI %s\n", lt9611c->hdmi_connected ? "connected" : "disconnected"); + } + + /*Clear interrupt: hardware requires two writes with delay*/ + regmap_write(lt9611c->regmap, 0xe0df, irq_status & BIT(0)); + usleep_range(10000, 12000); + regmap_write(lt9611c->regmap, 0xe0df, irq_status & (~BIT(0))); + + schedule_work(<9611c->work); + + return IRQ_HANDLED; +} + +static void lt9611c_hpd_work(struct work_struct *work) +{ + struct lt9611c *lt9611c = container_of(work, struct lt9611c, work); + bool connected; + + mutex_lock(<9611c->ocm_lock); + connected = lt9611c->hdmi_connected; + mutex_unlock(<9611c->ocm_lock); + + drm_bridge_hpd_notify(<9611c->bridge, + connected ? connector_status_connected : + connector_status_disconnected); +} + +static int lt9611c_regulator_init(struct lt9611c *lt9611c) +{ + struct device *dev = lt9611c->dev; + int ret; + + lt9611c->supplies[0].supply = "vcc"; + lt9611c->supplies[1].supply = "vdd"; + + ret = devm_regulator_bulk_get(dev, 2, lt9611c->supplies); + + return ret; +} + +static struct mipi_dsi_device *lt9611c_attach_dsi(struct lt9611c *lt9611c, + struct device_node *dsi_node) +{ + const struct mipi_dsi_device_info info = { "lt9611c", 0, NULL }; + struct mipi_dsi_device *dsi; + struct mipi_dsi_host *host; + struct device *dev = lt9611c->dev; + int ret; + + host = of_find_mipi_dsi_host_by_node(dsi_node); + if (!host) + return ERR_PTR(dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n")); + + dsi = devm_mipi_dsi_device_register_full(dev, host, &info); + if (IS_ERR(dsi)) + return ERR_PTR(dev_err_probe(dev, PTR_ERR(dsi), "failed to create dsi device\n")); + + dsi->lanes = 4; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | + MIPI_DSI_MODE_VIDEO_HSE; + + ret = devm_mipi_dsi_attach(dev, dsi); + if (ret < 0) + return ERR_PTR(dev_err_probe(dev, ret, "failed to attach dsi to host\n")); + + return dsi; +} + +static int lt9611c_bridge_attach(struct drm_bridge *bridge, + struct drm_encoder *encoder, + enum drm_bridge_attach_flags flags) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + + return drm_bridge_attach(encoder, lt9611c->bridge.next_bridge, bridge, flags); +} + +static enum drm_mode_status +lt9611c_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge, + const struct drm_display_mode *mode, + unsigned long long tmds_rate) +{ + const struct lt9611c *lt9611c = bridge_to_lt9611c_const(bridge); + + if (lt9611c->chip_type == CHIP_LT9611UXD) { + if (tmds_rate > 600000000) + return MODE_CLOCK_HIGH; + + } else { + if (tmds_rate > 340000000) + return MODE_CLOCK_HIGH; + } + + if (tmds_rate < 25000000) + return MODE_CLOCK_LOW; + + return MODE_OK; +} + +static void lt9611c_video_setup(struct lt9611c *lt9611c, + const struct drm_display_mode *mode) +{ + struct device *dev = lt9611c->dev; + int ret; + u32 h_total, hactive, hsync_len, hfront_porch, hback_porch; + u32 v_total, vactive, vsync_len, vfront_porch, vback_porch; + u8 timing_set_cmd[26] = {0x57, 0x4d, 0x33, 0x3a}; + u8 return_param[3]; + u8 framerate; + u8 vic = 0x00; + + guard(mutex)(<9611c->ocm_lock); + h_total = mode->htotal; + hactive = mode->hdisplay; + hsync_len = mode->hsync_end - mode->hsync_start; + hfront_porch = mode->hsync_start - mode->hdisplay; + hback_porch = mode->htotal - mode->hsync_end; + + v_total = mode->vtotal; + vactive = mode->vdisplay; + vsync_len = mode->vsync_end - mode->vsync_start; + vfront_porch = mode->vsync_start - mode->vdisplay; + vback_porch = mode->vtotal - mode->vsync_end; + framerate = drm_mode_vrefresh(mode); + vic = drm_match_cea_mode(mode); + + dev_dbg(dev, "hactive=%d, vactive=%d\n", hactive, vactive); + dev_dbg(dev, "framerate=%d\n", framerate); + dev_dbg(dev, "vic = 0x%02x\n", vic); + + timing_set_cmd[4] = (h_total >> 8) & 0xff; + timing_set_cmd[5] = h_total & 0xff; + timing_set_cmd[6] = (hactive >> 8) & 0xff; + timing_set_cmd[7] = hactive & 0xff; + timing_set_cmd[8] = (hfront_porch >> 8) & 0xff; + timing_set_cmd[9] = hfront_porch & 0xff; + timing_set_cmd[10] = (hsync_len >> 8) & 0xff; + timing_set_cmd[11] = hsync_len & 0xff; + timing_set_cmd[12] = (hback_porch >> 8) & 0xff; + timing_set_cmd[13] = hback_porch & 0xff; + timing_set_cmd[14] = (v_total >> 8) & 0xff; + timing_set_cmd[15] = v_total & 0xff; + timing_set_cmd[16] = (vactive >> 8) & 0xff; + timing_set_cmd[17] = vactive & 0xFF; + timing_set_cmd[18] = (vfront_porch >> 8) & 0xff; + timing_set_cmd[19] = vfront_porch & 0xff; + timing_set_cmd[20] = (vsync_len >> 8) & 0xff; + timing_set_cmd[21] = vsync_len & 0xff; + timing_set_cmd[22] = (vback_porch >> 8) & 0xff; + timing_set_cmd[23] = vback_porch & 0xff; + timing_set_cmd[24] = framerate; + timing_set_cmd[25] = vic; + + ret = lt9611c_read_write_flow(lt9611c, + timing_set_cmd, ARRAY_SIZE(timing_set_cmd), + return_param, ARRAY_SIZE(return_param)); + if (ret) + dev_err(dev, "video set failed\n"); +} + +static void lt9611c_bridge_atomic_pre_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + if (ret) + dev_err(lt9611c->dev, "regulator bulk enable failed.\n"); + lt9611c_reset(lt9611c); +} + +static void lt9611c_bridge_atomic_enable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + struct drm_connector *connector; + struct drm_connector_state *conn_state; + struct drm_crtc_state *crtc_state; + struct drm_display_mode *mode; + + connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder); + if (WARN_ON(!connector)) + return; + + conn_state = drm_atomic_get_new_connector_state(state, connector); + if (WARN_ON(!conn_state)) + return; + + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc); + if (WARN_ON(!crtc_state)) + return; + + mode = &crtc_state->adjusted_mode; + + lt9611c_video_setup(lt9611c, mode); +} + +static void lt9611c_bridge_atomic_post_disable(struct drm_bridge *bridge, + struct drm_atomic_state *state) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + int ret; + + ret = regulator_bulk_disable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + if (ret) + dev_err(lt9611c->dev, "regulator bulk disable failed.\n"); + gpiod_set_value_cansleep(lt9611c->reset_gpio, 0); +} + +static enum drm_connector_status +lt9611c_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + struct device *dev = lt9611c->dev; + int ret; + bool connected = false; + u8 cmd[5] = {0x52, 0x48, 0x31, 0x3a, 0x00}; + u8 data[5]; + + guard(mutex)(<9611c->ocm_lock); + + ret = lt9611c_read_write_flow(lt9611c, cmd, ARRAY_SIZE(cmd), data, ARRAY_SIZE(data)); + if (ret) + dev_err(dev, "failed to read HPD status (err=%d)\n", ret); + else + connected = (data[4] == 0x02); + + lt9611c->hdmi_connected = connected; + + return connected ? connector_status_connected : + connector_status_disconnected; +} + +static int lt9611c_get_edid_block(void *data, u8 *buf, + unsigned int block, size_t len) +{ + struct lt9611c *lt9611c = data; + struct device *dev = lt9611c->dev; + u8 cmd[5] = {0x52, 0x48, 0x33, 0x3a, 0x00}; + u8 packet[37]; + int ret, i, offset = 0; + + if (len != 128) + return -EINVAL; + guard(mutex)(<9611c->ocm_lock); + + for (i = 0; i < 4; i++) { + cmd[4] = block * 4 + i; + ret = lt9611c_read_write_flow(lt9611c, cmd, ARRAY_SIZE(cmd), + packet, ARRAY_SIZE(packet)); + if (ret) { + dev_err(dev, "Failed to read EDID block %u packet %d\n", + block, i); + return ret; + } + memcpy(buf + offset, &packet[5], 32); + offset += 32; + } + + return 0; +} + +static const struct drm_edid *lt9611c_bridge_edid_read(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + + return drm_edid_read_custom(connector, lt9611c_get_edid_block, lt9611c); +} + +static int lt9611c_hdmi_write_avi_infoframe(struct drm_bridge *bridge, + const u8 *buffer, size_t len) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + u8 *cmd; + u8 data[5]; + int ret; + + guard(mutex)(<9611c->ocm_lock); + + cmd = kmalloc(5 + len, GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + cmd[0] = 0x57; + cmd[1] = 0x48; + cmd[2] = 0x35; + cmd[3] = 0x3a; + cmd[4] = 0x01;/*write avi*/ + memcpy(cmd + 5, buffer, len); + + ret = lt9611c_read_write_flow(lt9611c, cmd, 5 + len, + data, ARRAY_SIZE(data)); + kfree(cmd); + + if (ret < 0) { + dev_err(lt9611c->dev, "write avi infoframe failed!\n"); + return ret; + } + + return 0; +} + +static int lt9611c_hdmi_clear_avi_infoframe(struct drm_bridge *bridge) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + u8 cmd[5] = {0x57, 0x48, 0x42, 0x3a, 0x01}; + u8 data[5]; + int ret; + + guard(mutex)(<9611c->ocm_lock); + + ret = lt9611c_read_write_flow(lt9611c, cmd, ARRAY_SIZE(cmd), + data, ARRAY_SIZE(data)); + + if (ret < 0) { + dev_err(lt9611c->dev, "clear avi infoframe failed!\n"); + return ret; + } + + return 0; +} + +static int lt9611c_hdmi_write_audio_infoframe(struct drm_bridge *bridge, + const u8 *buffer, size_t len) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + u8 *cmd; + u8 data[5]; + int ret; + + guard(mutex)(<9611c->ocm_lock); + + cmd = kmalloc(5 + len, GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + cmd[0] = 0x57; + cmd[1] = 0x48; + cmd[2] = 0x35; + cmd[3] = 0x3a; + cmd[4] = 0x02;/*write audio*/ + memcpy(cmd + 5, buffer, len); + + ret = lt9611c_read_write_flow(lt9611c, cmd, 5 + len, + data, ARRAY_SIZE(data)); + + kfree(cmd); + + if (ret < 0) { + dev_err(lt9611c->dev, "write audio infoframe failed!\n"); + return ret; + } + + return 0; +} + +static int lt9611c_hdmi_clear_audio_infoframe(struct drm_bridge *bridge) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + u8 cmd[5] = {0x57, 0x48, 0x42, 0x3a, 0x02}; + u8 data[5]; + int ret; + + guard(mutex)(<9611c->ocm_lock); + + ret = lt9611c_read_write_flow(lt9611c, cmd, ARRAY_SIZE(cmd), + data, ARRAY_SIZE(data)); + + if (ret < 0) { + dev_err(lt9611c->dev, "clear audio infoframe failed!\n"); + return ret; + } + + return 0; +} + +static int lt9611c_hdmi_audio_prepare(struct drm_bridge *bridge, + struct drm_connector *connector, + struct hdmi_codec_daifmt *fmt, + struct hdmi_codec_params *hparms) +{ + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge); + u8 audio_cmd[6] = {0x57, 0x48, 0x36, 0x3a}; + u8 data[5]; + int ret; + + if (hparms->sample_width == 32) + return -EINVAL; + + switch (fmt->fmt) { + case HDMI_I2S: + audio_cmd[4] = 0x01; + break; + case HDMI_SPDIF: + audio_cmd[4] = 0x02; + break; + default: + return -EINVAL; + } + + audio_cmd[5] = hparms->channels; + guard(mutex)(<9611c->ocm_lock); + + ret = lt9611c_read_write_flow(lt9611c, audio_cmd, sizeof(audio_cmd), + data, sizeof(data)); + if (ret < 0) { + dev_err(lt9611c->dev, "set audio info failed!\n"); + return ret; + } + + return drm_atomic_helper_connector_hdmi_update_audio_infoframe(connector, + &hparms->cea); +} + +static void lt9611c_hdmi_audio_shutdown(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + drm_atomic_helper_connector_hdmi_clear_audio_infoframe(connector); +} + +static int lt9611c_hdmi_audio_startup(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + return 0; +} + +static const struct drm_bridge_funcs lt9611c_bridge_funcs = { + .attach = lt9611c_bridge_attach, + .detect = lt9611c_bridge_detect, + .edid_read = lt9611c_bridge_edid_read, + .atomic_pre_enable = lt9611c_bridge_atomic_pre_enable, + .atomic_enable = lt9611c_bridge_atomic_enable, + .atomic_post_disable = lt9611c_bridge_atomic_post_disable, + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_reset = drm_atomic_helper_bridge_reset, + + .hdmi_tmds_char_rate_valid = lt9611c_hdmi_tmds_char_rate_valid, + .hdmi_write_avi_infoframe = lt9611c_hdmi_write_avi_infoframe, + .hdmi_clear_avi_infoframe = lt9611c_hdmi_clear_avi_infoframe, + .hdmi_write_audio_infoframe = lt9611c_hdmi_write_audio_infoframe, + .hdmi_clear_audio_infoframe = lt9611c_hdmi_clear_audio_infoframe, + + .hdmi_audio_startup = lt9611c_hdmi_audio_startup, + .hdmi_audio_prepare = lt9611c_hdmi_audio_prepare, + .hdmi_audio_shutdown = lt9611c_hdmi_audio_shutdown, +}; + +static int lt9611c_parse_dt(struct device *dev, + struct lt9611c *lt9611c) +{ + lt9611c->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1); + if (!lt9611c->dsi0_node) + return dev_err_probe(dev, -ENODEV, "failed to get remote node for primary dsi\n"); + + lt9611c->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1); + + return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, <9611c->bridge.next_bridge); +} + +static int lt9611c_gpio_init(struct lt9611c *lt9611c) +{ + struct device *dev = lt9611c->dev; + + lt9611c->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(lt9611c->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(lt9611c->reset_gpio), + "failed to acquire reset gpio\n"); + + return 0; +} + +static int lt9611c_read_version(struct lt9611c *lt9611c) +{ + u8 buf[2]; + int ret; + + ret = regmap_write(lt9611c->regmap, 0xe0ee, 0x01); + if (ret) + return ret; + + ret = regmap_bulk_read(lt9611c->regmap, 0xe080, buf, ARRAY_SIZE(buf)); + if (ret) + return ret; + + return (buf[0] << 8) | buf[1]; +} + +static int lt9611c_read_chipid(struct lt9611c *lt9611c) +{ + struct device *dev = lt9611c->dev; + u8 chipid[2]; + int ret; + + ret = regmap_write(lt9611c->regmap, 0xe0ee, 0x01); + if (ret) + return ret; + + ret = regmap_bulk_read(lt9611c->regmap, 0xe100, chipid, 2); + if (ret) + return ret; + + if (chipid[0] != 0x23 || chipid[1] != 0x06) { + dev_err(dev, "ChipID: 0x%02x 0x%02x\n", chipid[0], chipid[1]); + return -ENODEV; + } + + return 0; +} + +static ssize_t lt9611c_firmware_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lt9611c *lt9611c = dev_get_drvdata(dev); + int ret; + + lt9611c_lock(lt9611c); + + ret = lt9611c_firmware_upgrade(lt9611c); + if (ret < 0) + dev_err(dev, "upgrade failure\n"); + + lt9611c_unlock(lt9611c); + + return ret < 0 ? ret : len; +} + +static ssize_t lt9611c_firmware_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct lt9611c *lt9611c = dev_get_drvdata(dev); + + return sysfs_emit(buf, "0x%04x\n", lt9611c->fw_version); +} + +static DEVICE_ATTR_RW(lt9611c_firmware); + +static struct attribute *lt9611c_attrs[] = { + &dev_attr_lt9611c_firmware.attr, + NULL, +}; + +static const struct attribute_group lt9611c_attr_group = { + .attrs = lt9611c_attrs, +}; + +static const struct attribute_group *lt9611c_attr_groups[] = { + <9611c_attr_group, + NULL, +}; + +static int lt9611c_probe(struct i2c_client *client) +{ + const struct i2c_device_id *id = i2c_client_get_device_id(client); + struct lt9611c *lt9611c; + struct device *dev = &client->dev; + bool fw_updated = false; + int ret; + + crc8_populate_msb(lt9611c_crc8_table, LT9611C_CRC_POLYNOMIAL); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) + return dev_err_probe(dev, -ENODEV, "device doesn't support I2C\n"); + + lt9611c = devm_drm_bridge_alloc(dev, struct lt9611c, bridge, <9611c_bridge_funcs); + if (IS_ERR(lt9611c)) + return dev_err_probe(dev, PTR_ERR(lt9611c), "drm bridge alloc failed.\n"); + + lt9611c->dev = dev; + lt9611c->client = client; + lt9611c->chip_type = id->driver_data; + ret = devm_mutex_init(dev, <9611c->ocm_lock); + if (ret) + return dev_err_probe(dev, ret, "failed to init mutex\n"); + + lt9611c->regmap = devm_regmap_init_i2c(client, <9611c_regmap_config); + if (IS_ERR(lt9611c->regmap)) + return dev_err_probe(dev, PTR_ERR(lt9611c->regmap), "regmap i2c init failed\n"); + + ret = lt9611c_parse_dt(dev, lt9611c); + if (ret) + return dev_err_probe(dev, ret, "failed to parse device tree\n"); + + ret = lt9611c_gpio_init(lt9611c); + if (ret < 0) + goto err_of_put; + + ret = lt9611c_regulator_init(lt9611c); + if (ret < 0) + goto err_of_put; + + ret = regulator_bulk_enable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + if (ret) + goto err_of_put; + + lt9611c_reset(lt9611c); + + lt9611c_lock(lt9611c); + + ret = lt9611c_read_chipid(lt9611c); + if (ret < 0) { + dev_err(dev, "failed to read chip id.\n"); + lt9611c_unlock(lt9611c); + goto err_disable_regulators; + } + +retry: + lt9611c->fw_version = lt9611c_read_version(lt9611c); + if (lt9611c->fw_version < 0) { + dev_err(dev, "failed to read fw version\n"); + ret = -EOPNOTSUPP; + lt9611c_unlock(lt9611c); + goto err_disable_regulators; + + } else if (lt9611c->fw_version == 0) { + if (!fw_updated) { + fw_updated = true; + ret = lt9611c_firmware_upgrade(lt9611c); + if (ret < 0) { + lt9611c_unlock(lt9611c); + goto err_disable_regulators; + } + + goto retry; + + } else { + dev_err(dev, "fw version 0x%04x, update failed\n", lt9611c->fw_version); + ret = -EOPNOTSUPP; + lt9611c_unlock(lt9611c); + goto err_disable_regulators; + } + } + + lt9611c_unlock(lt9611c); + dev_dbg(dev, "current version:0x%04x", lt9611c->fw_version); + + INIT_WORK(<9611c->work, lt9611c_hpd_work); + + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, + lt9611c_irq_thread_handler, + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT | + IRQF_NO_AUTOEN, + "lt9611c", lt9611c); + if (ret) { + dev_err(dev, "failed to request irq\n"); + goto err_disable_regulators; + } + + lt9611c->bridge.of_node = client->dev.of_node; + lt9611c->bridge.ops = DRM_BRIDGE_OP_DETECT | + DRM_BRIDGE_OP_EDID | + DRM_BRIDGE_OP_HPD | + DRM_BRIDGE_OP_HDMI | + DRM_BRIDGE_OP_HDMI_AUDIO; + lt9611c->bridge.type = DRM_MODE_CONNECTOR_HDMIA; + + lt9611c->bridge.hdmi_audio_dev = dev; + lt9611c->bridge.hdmi_audio_max_i2s_playback_channels = 8; + lt9611c->bridge.hdmi_audio_dai_port = 2; + + devm_drm_bridge_add(dev, <9611c->bridge); + + /* Attach primary DSI */ + lt9611c->dsi0 = lt9611c_attach_dsi(lt9611c, lt9611c->dsi0_node); + if (IS_ERR(lt9611c->dsi0)) { + ret = PTR_ERR(lt9611c->dsi0); + goto err_remove_bridge; + } + + /* Attach secondary DSI, if specified */ + if (lt9611c->dsi1_node) { + lt9611c->dsi1 = lt9611c_attach_dsi(lt9611c, lt9611c->dsi1_node); + if (IS_ERR(lt9611c->dsi1)) { + ret = PTR_ERR(lt9611c->dsi1); + goto err_remove_bridge; + } + } + + lt9611c->hdmi_connected = false; + i2c_set_clientdata(client, lt9611c); + enable_irq(client->irq); + lt9611c_reset(lt9611c); + + return 0; + +err_remove_bridge: + free_irq(client->irq, lt9611c); + cancel_work_sync(<9611c->work); + drm_bridge_remove(<9611c->bridge); + +err_disable_regulators: + regulator_bulk_disable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + +err_of_put: + of_node_put(lt9611c->dsi1_node); + of_node_put(lt9611c->dsi0_node); + + return ret; +} + +static void lt9611c_remove(struct i2c_client *client) +{ + struct lt9611c *lt9611c = i2c_get_clientdata(client); + + free_irq(client->irq, lt9611c); + cancel_work_sync(<9611c->work); + regulator_bulk_disable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + of_node_put(lt9611c->dsi1_node); + of_node_put(lt9611c->dsi0_node); +} + +static int lt9611c_bridge_suspend(struct device *dev) +{ + struct lt9611c *lt9611c = dev_get_drvdata(dev); + int ret; + + dev_dbg(lt9611c->dev, "suspend\n"); + disable_irq(lt9611c->client->irq); + ret = regulator_bulk_disable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + if (ret) { + dev_err(lt9611c->dev, "regulator bulk disable failed.\n"); + return ret; + } + gpiod_set_value_cansleep(lt9611c->reset_gpio, 0); + + return ret; +} + +static int lt9611c_bridge_resume(struct device *dev) +{ + struct lt9611c *lt9611c = dev_get_drvdata(dev); + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(lt9611c->supplies), lt9611c->supplies); + if (ret) { + dev_err(lt9611c->dev, "regulator bulk enable failed.\n"); + return ret; + } + enable_irq(lt9611c->client->irq); + lt9611c_reset(lt9611c); + dev_dbg(lt9611c->dev, "resume\n"); + + return ret; +} + +static const struct dev_pm_ops lt9611c_bridge_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(lt9611c_bridge_suspend, + lt9611c_bridge_resume) +}; + +static struct i2c_device_id lt9611c_id[] = { + /* chip_type */ + { "lontium,lt9611c", 0 }, + { "lontium,lt9611ex", 1 }, + { "lontium,lt9611uxd", 2 }, + { /* sentinel */ } +}; + +static const struct of_device_id lt9611c_match_table[] = { + { .compatible = "lontium,lt9611c" }, + { .compatible = "lontium,lt9611ex" }, + { .compatible = "lontium,lt9611uxd" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, lt9611c_match_table); + +static struct i2c_driver lt9611c_driver = { + .driver = { + .name = "lt9611c", + .of_match_table = lt9611c_match_table, + .pm = <9611c_bridge_pm_ops, + .dev_groups = lt9611c_attr_groups, + }, + .probe = lt9611c_probe, + .remove = lt9611c_remove, + .id_table = lt9611c_id, +}; +module_i2c_driver(lt9611c_driver); + +MODULE_AUTHOR("SunYun Yang <[email protected]>"); +MODULE_DESCRIPTION("Lontium LT9611C(EX/UXD) MIPI DSI to HDMI driver"); +MODULE_LICENSE("GPL"); +MODULE_FIRMWARE(FW_FILE); + -- 2.34.1
