Re: [PATCH v2 6/9] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
From: Liu Ying
Date: Sat Oct 12 2024 - 06:01:28 EST
On 10/12/2024, Dmitry Baryshkov wrote:
> On Sat, Oct 12, 2024 at 03:35:40PM +0800, Liu Ying wrote:
>> Add basic HDMI video output support. Currently, only RGB888 output
>> pixel format is supported. At the LVDS input side, the driver
>> supports single LVDS link and dual LVDS links with "jeida-24" LVDS
>> mapping.
>>
>> Product link:
>> https://www.ite.com.tw/en/product/cate1/IT6263
>>
>> Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
>> ---
>> v2:
>> * Add AVI inforframe support. (Maxime)
>
> Maxime asked to wire up the HDMI Connector framework. I have pushed the
> patch that converts lt9611.c driver. Please implement similar changes in
> your driver.
Hmm, didn't fully get the meaning of "the new HDMI bridge infrastructure"
maxime asked. Ok, will take a look at lt9611.c.
>
>> * Add DRM_MODE_CONNECTOR_HDMIA. (Biju)
>> * Rename it6263_reset() to it6263_hw_reset(). (Biju)
>> * Check number of LVDS link data lanes. (Biju)
>>
>> drivers/gpu/drm/bridge/Kconfig | 8 +
>> drivers/gpu/drm/bridge/Makefile | 1 +
>> drivers/gpu/drm/bridge/ite-it6263.c | 919 ++++++++++++++++++++++++++++
>> 3 files changed, 928 insertions(+)
>> create mode 100644 drivers/gpu/drm/bridge/ite-it6263.c
>>
>> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
>> index 3eb955333c80..93f99682a090 100644
>> --- a/drivers/gpu/drm/bridge/Kconfig
>> +++ b/drivers/gpu/drm/bridge/Kconfig
>> @@ -90,6 +90,14 @@ config DRM_FSL_LDB
>> help
>> Support for i.MX8MP DPI-to-LVDS on-SoC encoder.
>>
>> +config DRM_ITE_IT6263
>> + tristate "ITE IT6263 LVDS/HDMI bridge"
>> + depends on OF
>> + select DRM_KMS_HELPER
>> + select REGMAP_I2C
>> + help
>> + ITE IT6263 LVDS to HDMI bridge chip driver.
>> +
>> config DRM_ITE_IT6505
>> tristate "ITE IT6505 DisplayPort bridge"
>> depends on OF
>> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
>> index 7df87b582dca..f3776dd473fd 100644
>> --- a/drivers/gpu/drm/bridge/Makefile
>> +++ b/drivers/gpu/drm/bridge/Makefile
>> @@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
>> obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o
>> obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
>> obj-$(CONFIG_DRM_FSL_LDB) += fsl-ldb.o
>> +obj-$(CONFIG_DRM_ITE_IT6263) += ite-it6263.o
>> obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o
>> obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o
>> obj-$(CONFIG_DRM_LONTIUM_LT9211) += lontium-lt9211.o
>> diff --git a/drivers/gpu/drm/bridge/ite-it6263.c b/drivers/gpu/drm/bridge/ite-it6263.c
>> new file mode 100644
>> index 000000000000..9b3318792f15
>> --- /dev/null
>> +++ b/drivers/gpu/drm/bridge/ite-it6263.c
>> @@ -0,0 +1,919 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright 2024 NXP
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/bits.h>
>> +#include <linux/delay.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/hdmi.h>
>> +#include <linux/i2c.h>
>> +#include <linux/media-bus-format.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/consumer.h>
>> +
>> +#include <drm/drm_atomic.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_atomic_state_helper.h>
>> +#include <drm/drm_bridge.h>
>> +#include <drm/drm_connector.h>
>> +#include <drm/drm_crtc.h>
>> +#include <drm/drm_edid.h>
>> +#include <drm/drm_of.h>
>> +#include <drm/drm_probe_helper.h>
>> +
>> +/* -----------------------------------------------------------------------------
>> + * LVDS registers
>> + */
>> +
>> +/* LVDS software reset registers */
>> +#define LVDS_REG_05 0x05
>> +#define REG_SOFT_P_RST BIT(1)
>> +
>> +/* LVDS system configuration registers */
>> +/* 0x0b */
>> +#define LVDS_REG_0B 0x0b
>> +#define REG_SSC_PCLK_RF BIT(0)
>> +#define REG_LVDS_IN_SWAP BIT(1)
>> +
>> +/* LVDS test pattern gen control registers */
>> +/* 0x2c */
>> +#define LVDS_REG_2C 0x2c
>> +#define REG_COL_DEP GENMASK(1, 0)
>> +#define BIT8 FIELD_PREP(REG_COL_DEP, 2)
>> +#define OUT_MAP BIT(4)
>> +#define JEIDA 0
>> +#define REG_DESSC_ENB BIT(6)
>> +#define DMODE BIT(7)
>> +#define DISO BIT(7)
>> +#define SISO 0
>> +
>> +#define LVDS_REG_3C 0x3c
>> +#define LVDS_REG_3F 0x3f
>> +#define LVDS_REG_47 0x47
>> +#define LVDS_REG_48 0x48
>> +#define LVDS_REG_4F 0x4f
>> +#define LVDS_REG_52 0x52
>> +
>> +/* -----------------------------------------------------------------------------
>> + * HDMI registers are separated into three banks:
>> + * 1) HDMI register common bank: 0x00 ~ 0x2f
>> + */
>> +
>> +/* HDMI genernal registers */
>> +#define HDMI_REG_SW_RST 0x04
>> +#define SOFTREF_RST BIT(5)
>> +#define SOFTA_RST BIT(4)
>> +#define SOFTV_RST BIT(3)
>> +#define AUD_RST BIT(2)
>> +#define HDCP_RST BIT(0)
>> +#define HDMI_RST_ALL (SOFTREF_RST | SOFTA_RST | SOFTV_RST | \
>> + AUD_RST | HDCP_RST)
>> +
>> +#define HDMI_REG_SYS_STATUS 0x0e
>> +#define HPDETECT BIT(6)
>> +#define TXVIDSTABLE BIT(4)
>> +
>> +#define HDMI_REG_BANK_CTRL 0x0f
>> +#define REG_BANK_SEL BIT(0)
>> +
>> +/* HDMI System DDC control registers */
>> +#define HDMI_REG_DDC_MASTER_CTRL 0x10
>> +#define MASTER_SEL_HOST BIT(0)
>> +
>> +#define HDMI_REG_DDC_HEADER 0x11
>> +
>> +#define HDMI_REG_DDC_REQOFF 0x12
>> +#define HDMI_REG_DDC_REQCOUNT 0x13
>> +#define HDMI_REG_DDC_EDIDSEG 0x14
>> +
>> +#define HDMI_REG_DDC_CMD 0x15
>> +#define DDC_CMD_EDID_READ 0x3
>> +#define DDC_CMD_FIFO_CLR 0x9
>> +
>> +#define HDMI_REG_DDC_STATUS 0x16
>> +#define DDC_DONE BIT(7)
>> +#define DDC_NOACK BIT(5)
>> +#define DDC_WAITBUS BIT(4)
>> +#define DDC_ARBILOSE BIT(3)
>> +#define DDC_ERROR (DDC_NOACK | DDC_WAITBUS | DDC_ARBILOSE)
>> +
>> +#define HDMI_DDC_FIFO_BYTES 32
>> +#define HDMI_REG_DDC_READFIFO 0x17
>> +#define HDMI_REG_LVDS_PORT 0x1d /* LVDS input control I2C addr */
>> +#define HDMI_REG_LVDS_PORT_EN 0x1e
>> +#define LVDS_INPUT_CTRL_I2C_ADDR 0x33
>> +
>> +/* -----------------------------------------------------------------------------
>> + * 2) HDMI register bank0: 0x30 ~ 0xff
>> + */
>> +
>> +/* HDMI AFE registers */
>> +#define HDMI_REG_AFE_DRV_CTRL 0x61
>> +#define AFE_DRV_PWD BIT(5)
>> +#define AFE_DRV_RST BIT(4)
>> +
>> +#define HDMI_REG_AFE_XP_CTRL 0x62
>> +#define AFE_XP_GAINBIT BIT(7)
>> +#define AFE_XP_ER0 BIT(4)
>> +#define AFE_XP_RESETB BIT(3)
>> +
>> +#define HDMI_REG_AFE_ISW_CTRL 0x63
>> +
>> +#define HDMI_REG_AFE_IP_CTRL 0x64
>> +#define AFE_IP_GAINBIT BIT(7)
>> +#define AFE_IP_ER0 BIT(3)
>> +#define AFE_IP_RESETB BIT(2)
>> +
>> +/* HDMI input data format registers */
>> +#define HDMI_REG_INPUT_MODE 0x70
>> +#define IN_RGB 0x00
>> +
>> +/* HDMI general control registers */
>> +#define HDMI_REG_HDMI_MODE 0xc0
>> +#define TX_HDMI_MODE BIT(0)
>> +
>> +#define HDMI_REG_GCP 0xc1
>> +#define AVMUTE BIT(0)
>> +#define HDMI_COLOR_DEPTH GENMASK(6, 4)
>> +#define HDMI_COLOR_DEPTH_24 FIELD_PREP(HDMI_COLOR_DEPTH, 4)
>> +
>> +#define HDMI_REG_PKT_GENERAL_CTRL 0xc6
>> +#define ENABLE_PKT BIT(0)
>> +#define REPEAT_PKT BIT(1)
>> +
>> +/* -----------------------------------------------------------------------------
>> + * 3) HDMI register bank1: 0x130 ~ 0x1ff (HDMI packet registers)
>> + */
>> +
>> +/* AVI packet registers */
>> +#define HDMI_REG_AVI_DB1 0x158
>> +#define HDMI_REG_AVI_DB2 0x159
>> +#define HDMI_REG_AVI_DB3 0x15a
>> +#define HDMI_REG_AVI_DB4 0x15b
>> +#define HDMI_REG_AVI_DB5 0x15c
>> +#define HDMI_REG_AVI_CSUM 0x15d
>> +#define HDMI_REG_AVI_DB6 0x15e
>> +#define HDMI_REG_AVI_DB7 0x15f
>> +#define HDMI_REG_AVI_DB8 0x160
>> +#define HDMI_REG_AVI_DB9 0x161
>> +#define HDMI_REG_AVI_DB10 0x162
>> +#define HDMI_REG_AVI_DB11 0x163
>> +#define HDMI_REG_AVI_DB12 0x164
>> +#define HDMI_REG_AVI_DB13 0x165
>> +
>> +#define HDMI_AVI_DB_CHUNK1_SIZE (HDMI_REG_AVI_DB5 - HDMI_REG_AVI_DB1 + 1)
>> +#define HDMI_AVI_DB_CHUNK2_SIZE (HDMI_REG_AVI_DB13 - HDMI_REG_AVI_DB6 + 1)
>> +
>> +#define MAX_PIXEL_CLOCK_KHZ 150000
>> +#define HIGH_PIXEL_CLOCK_KHZ 80000
>> +
>> +struct it6263 {
>> + struct device *dev;
>> + struct i2c_client *hdmi_i2c;
>> + struct i2c_client *lvds_i2c;
>> + struct regmap *hdmi_regmap;
>> + struct regmap *lvds_regmap;
>> + struct drm_bridge bridge;
>> + struct drm_bridge *next_bridge;
>> + struct drm_connector connector;
>> + struct gpio_desc *reset_gpio;
>> + u8 lvds_link_num_dlanes;
>> + bool lvds_dual_link;
>> + bool lvds_link12_swap;
>> +};
>> +
>> +static inline struct it6263 *bridge_to_it6263(struct drm_bridge *bridge)
>> +{
>> + return container_of(bridge, struct it6263, bridge);
>> +}
>> +
>> +static inline struct it6263 *connector_to_it6263(struct drm_connector *conn)
>> +{
>> + return container_of(conn, struct it6263, connector);
>> +}
>> +
>> +static bool it6263_hdmi_writeable_reg(struct device *dev, unsigned int reg)
>> +{
>> + switch (reg) {
>> + case HDMI_REG_SW_RST:
>> + case HDMI_REG_BANK_CTRL:
>> + case HDMI_REG_DDC_MASTER_CTRL:
>> + case HDMI_REG_DDC_HEADER:
>> + case HDMI_REG_DDC_REQOFF:
>> + case HDMI_REG_DDC_REQCOUNT:
>> + case HDMI_REG_DDC_EDIDSEG:
>> + case HDMI_REG_DDC_CMD:
>> + case HDMI_REG_LVDS_PORT:
>> + case HDMI_REG_LVDS_PORT_EN:
>> + case HDMI_REG_AFE_DRV_CTRL:
>> + case HDMI_REG_AFE_XP_CTRL:
>> + case HDMI_REG_AFE_ISW_CTRL:
>> + case HDMI_REG_AFE_IP_CTRL:
>> + case HDMI_REG_INPUT_MODE:
>> + case HDMI_REG_HDMI_MODE:
>> + case HDMI_REG_GCP:
>> + case HDMI_REG_PKT_GENERAL_CTRL:
>> + case HDMI_REG_AVI_DB1:
>> + case HDMI_REG_AVI_DB2:
>> + case HDMI_REG_AVI_DB3:
>> + case HDMI_REG_AVI_DB4:
>> + case HDMI_REG_AVI_DB5:
>> + case HDMI_REG_AVI_CSUM:
>> + case HDMI_REG_AVI_DB6:
>> + case HDMI_REG_AVI_DB7:
>> + case HDMI_REG_AVI_DB8:
>> + case HDMI_REG_AVI_DB9:
>> + case HDMI_REG_AVI_DB10:
>> + case HDMI_REG_AVI_DB11:
>> + case HDMI_REG_AVI_DB12:
>> + case HDMI_REG_AVI_DB13:
>> + return true;
>> + default:
>> + return false;
>> + }
>> +}
>> +
>> +static bool it6263_hdmi_readable_reg(struct device *dev, unsigned int reg)
>> +{
>> + if (it6263_hdmi_writeable_reg(dev, reg))
>> + return true;
>> +
>> + switch (reg) {
>> + case HDMI_REG_SYS_STATUS:
>> + case HDMI_REG_DDC_STATUS:
>> + case HDMI_REG_DDC_READFIFO:
>> + return true;
>> + default:
>> + return false;
>> + }
>> +}
>> +
>> +static bool it6263_hdmi_volatile_reg(struct device *dev, unsigned int reg)
>> +{
>> + switch (reg) {
>> + case HDMI_REG_SW_RST:
>> + case HDMI_REG_SYS_STATUS:
>> + case HDMI_REG_DDC_STATUS:
>> + case HDMI_REG_DDC_READFIFO:
>> + return true;
>> + default:
>> + return false;
>> + }
>> +}
>> +
>> +static const struct regmap_range_cfg it6263_hdmi_range_cfg = {
>> + .range_min = 0x00,
>> + .range_max = HDMI_REG_AVI_DB13,
>> + .selector_reg = HDMI_REG_BANK_CTRL,
>> + .selector_mask = REG_BANK_SEL,
>> + .selector_shift = 0,
>> + .window_start = 0x00,
>> + .window_len = 0x100,
>> +};
>> +
>> +static const struct regmap_config it6263_hdmi_regmap_config = {
>> + .name = "it6263-hdmi",
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> + .writeable_reg = it6263_hdmi_writeable_reg,
>> + .readable_reg = it6263_hdmi_readable_reg,
>> + .volatile_reg = it6263_hdmi_volatile_reg,
>> + .max_register = HDMI_REG_AVI_DB13,
>> + .ranges = &it6263_hdmi_range_cfg,
>> + .num_ranges = 1,
>> + .cache_type = REGCACHE_MAPLE,
>> +};
>> +
>> +static bool it6263_lvds_writeable_reg(struct device *dev, unsigned int reg)
>> +{
>> + switch (reg) {
>> + case LVDS_REG_05:
>> + case LVDS_REG_0B:
>> + case LVDS_REG_2C:
>> + case LVDS_REG_3C:
>> + case LVDS_REG_3F:
>> + case LVDS_REG_47:
>> + case LVDS_REG_48:
>> + case LVDS_REG_4F:
>> + case LVDS_REG_52:
>> + return true;
>> + default:
>> + return false;
>> + }
>> +}
>> +
>> +static bool it6263_lvds_readable_reg(struct device *dev, unsigned int reg)
>> +{
>> + return it6263_lvds_writeable_reg(dev, reg);
>> +}
>> +
>> +static bool it6263_lvds_volatile_reg(struct device *dev, unsigned int reg)
>> +{
>> + return reg == LVDS_REG_05;
>> +}
>> +
>> +static const struct regmap_config it6263_lvds_regmap_config = {
>> + .name = "it6263-lvds",
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> + .writeable_reg = it6263_lvds_writeable_reg,
>> + .readable_reg = it6263_lvds_readable_reg,
>> + .volatile_reg = it6263_lvds_volatile_reg,
>> + .max_register = LVDS_REG_52,
>> + .cache_type = REGCACHE_MAPLE,
>> +};
>> +
>> +static const char * const it6263_supplies[] = {
>> + "ivdd", "ovdd", "txavcc18", "txavcc33", "pvcc1", "pvcc2",
>> + "avcc", "anvdd", "apvdd"
>> +};
>> +
>> +static int it6263_parse_dt(struct it6263 *it)
>> +{
>> + struct device *dev = it->dev;
>> + struct device_node *port0, *port1;
>> + int ret;
>> +
>> + ret = of_property_read_u8(dev->of_node, "ite,lvds-link-num-data-lanes",
>> + &it->lvds_link_num_dlanes);
>> + if (ret) {
>> + dev_err(dev, "failed to get LVDS link number of data lanes: %d\n",
>> + ret);
>> + return ret;
>> + }
>> +
>> + it->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 2, 0);
>> + if (IS_ERR(it->next_bridge))
>> + return dev_err_probe(dev, PTR_ERR(it->next_bridge),
>> + "failed to get next bridge\n");
>> +
>> + port0 = of_graph_get_port_by_id(dev->of_node, 0);
>> + port1 = of_graph_get_port_by_id(dev->of_node, 1);
>> + if (port0 && port1) {
>> + if (of_property_read_bool(port0, "dual-lvds-even-pixels") &&
>> + of_property_read_bool(port1, "dual-lvds-odd-pixels")) {
>> + it->lvds_dual_link = true;
>> + it->lvds_link12_swap = true;
>
> This is a nice name for the propery in the Dual Link LVDS case:
>
> ite,lvds-link-swap
Swapping LVDS link1&2 is implied by the dual-lvds-{even,odd}-pixels
properties that DT writers specify in port@0 and port@1.
The DT writers don't need to use a dedicated property like
ite,lvds-link-swap to explicitly indicate the swap.
>
>
>> + } else if (of_property_read_bool(port0, "dual-lvds-odd-pixels") &&
>> + of_property_read_bool(port1, "dual-lvds-even-pixels")) {
>> + it->lvds_dual_link = true;
>> + }
>> +
>> + if (!it->lvds_dual_link) {
>> + dev_err(dev,
>> + "failed to get LVDS dual link pixel order\n");
>> + ret = -EINVAL;
>> + }
>> + } else if (port1) {
>> + ret = -EINVAL;
>> + dev_err(dev, "single input LVDS port1 is not supported\n");
>> + } else if (!port0) {
>> + ret = -EINVAL;
>> + dev_err(dev, "no input LVDS port\n");
>> + }
>> +
>> + of_node_put(port0);
>> + of_node_put(port1);
>> +
>> + return ret;
>> +}
>> +
>> +static inline void it6263_hw_reset(struct it6263 *it)
>> +{
>> + if (!it->reset_gpio)
>> + return;
>> +
>> + gpiod_set_value_cansleep(it->reset_gpio, 0);
>> + fsleep(1000);
>> + gpiod_set_value_cansleep(it->reset_gpio, 1);
>> + /* The chip maker says the low pulse should be at least 40ms. */
>> + fsleep(40000);
>> + gpiod_set_value_cansleep(it->reset_gpio, 0);
>> + /* addtional time to wait the high voltage to be stable */
>> + fsleep(5000);
>> +}
>> +
>> +static inline int it6263_lvds_set_i2c_addr(struct it6263 *it)
>> +{
>> + int ret;
>> +
>> + ret = regmap_write(it->hdmi_regmap, HDMI_REG_LVDS_PORT,
>> + LVDS_INPUT_CTRL_I2C_ADDR << 1);
>> + if (ret)
>> + return ret;
>> +
>> + return regmap_write(it->hdmi_regmap, HDMI_REG_LVDS_PORT_EN, BIT(0));
>> +}
>> +
>> +static inline void it6263_lvds_reset(struct it6263 *it)
>> +{
>> + /* AFE PLL reset */
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_3C, BIT(0), 0x0);
>> + fsleep(1000);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_3C, BIT(0), BIT(0));
>> +
>> + /* software pixel clock domain reset */
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_05, REG_SOFT_P_RST,
>> + REG_SOFT_P_RST);
>> + fsleep(1000);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_05, REG_SOFT_P_RST, 0x0);
>> + fsleep(10000);
>> +}
>> +
>> +static inline void it6263_lvds_set_interface(struct it6263 *it)
>> +{
>> + /* color depth */
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_2C, REG_COL_DEP, BIT8);
>> + /* output mapping */
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_2C, OUT_MAP, JEIDA);
>> +
>> + if (it->lvds_dual_link) {
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_2C, DMODE, DISO);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_52, BIT(1), BIT(1));
>> + } else {
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_2C, DMODE, SISO);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_52, BIT(1), 0);
>> + }
>> +}
>> +
>> +static inline void it6263_lvds_set_afe(struct it6263 *it)
>> +{
>> + regmap_write(it->lvds_regmap, LVDS_REG_3C, 0xaa);
>> + regmap_write(it->lvds_regmap, LVDS_REG_3F, 0x02);
>> + regmap_write(it->lvds_regmap, LVDS_REG_47, 0xaa);
>> + regmap_write(it->lvds_regmap, LVDS_REG_48, 0x02);
>> + regmap_write(it->lvds_regmap, LVDS_REG_4F, 0x11);
>> +
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_0B, REG_SSC_PCLK_RF,
>> + REG_SSC_PCLK_RF);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_3C, 0x07, 0);
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_2C, REG_DESSC_ENB,
>> + REG_DESSC_ENB);
>> +}
>> +
>> +static inline void it6263_lvds_sys_cfg(struct it6263 *it)
>> +{
>> + regmap_write_bits(it->lvds_regmap, LVDS_REG_0B, REG_LVDS_IN_SWAP,
>> + it->lvds_link12_swap ? REG_LVDS_IN_SWAP : 0);
>> +}
>> +
>> +static inline void it6263_lvds_config(struct it6263 *it)
>> +{
>> + it6263_lvds_reset(it);
>> + it6263_lvds_set_interface(it);
>> + it6263_lvds_set_afe(it);
>> + it6263_lvds_sys_cfg(it);
>> +}
>> +
>> +static inline void it6263_hdmi_config(struct it6263 *it)
>> +{
>> + regmap_write(it->hdmi_regmap, HDMI_REG_SW_RST, HDMI_RST_ALL);
>> + regmap_write(it->hdmi_regmap, HDMI_REG_INPUT_MODE, IN_RGB);
>> + regmap_write_bits(it->hdmi_regmap, HDMI_REG_GCP, HDMI_COLOR_DEPTH,
>> + HDMI_COLOR_DEPTH_24);
>> +}
>> +
>> +static enum drm_connector_status it6263_detect(struct it6263 *it)
>> +{
>> + unsigned int val;
>> +
>> + regmap_read(it->hdmi_regmap, HDMI_REG_SYS_STATUS, &val);
>> + if (val & HPDETECT)
>> + return connector_status_connected;
>> + else
>> + return connector_status_disconnected;
>> +}
>> +
>> +static enum drm_connector_status
>> +it6263_connector_detect(struct drm_connector *connector, bool force)
>> +{
>> + struct it6263 *it = connector_to_it6263(connector);
>> +
>> + return it6263_detect(it);
>> +}
>> +
>> +static const struct drm_connector_funcs it6263_connector_funcs = {
>> + .detect = it6263_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 int it6263_read_edid(void *data, u8 *buf, unsigned int block, size_t len)
>> +{
>> + struct it6263 *it = data;
>> + struct regmap *regmap = it->hdmi_regmap;
>> + unsigned int start = (block % 2) * EDID_LENGTH;
>> + unsigned int segment = block >> 1;
>> + unsigned int count, val;
>> + int ret;
>> +
>> + regmap_write(regmap, HDMI_REG_DDC_MASTER_CTRL, MASTER_SEL_HOST);
>> + regmap_write(regmap, HDMI_REG_DDC_HEADER, DDC_ADDR << 1);
>> + regmap_write(regmap, HDMI_REG_DDC_EDIDSEG, segment);
>> +
>> + while (len) {
>> + /* clear DDC FIFO */
>> + regmap_write(regmap, HDMI_REG_DDC_CMD, DDC_CMD_FIFO_CLR);
>> +
>> + ret = regmap_read_poll_timeout(regmap, HDMI_REG_DDC_STATUS,
>> + val, val & DDC_DONE,
>> + 2000, 10000);
>> + if (ret) {
>> + dev_err(it->dev, "failed to clear DDC FIFO:%d\n", ret);
>> + return ret;
>> + }
>> +
>> + count = len > HDMI_DDC_FIFO_BYTES ? HDMI_DDC_FIFO_BYTES : len;
>> +
>> + /* fire the read command */
>> + regmap_write(regmap, HDMI_REG_DDC_REQOFF, start);
>> + regmap_write(regmap, HDMI_REG_DDC_REQCOUNT, count);
>> + regmap_write(regmap, HDMI_REG_DDC_CMD, DDC_CMD_EDID_READ);
>> +
>> + start += count;
>> + len -= count;
>> +
>> + ret = regmap_read_poll_timeout(regmap, HDMI_REG_DDC_STATUS, val,
>> + val & (DDC_DONE | DDC_ERROR),
>> + 20000, 250000);
>> + if (ret && !(val & DDC_ERROR)) {
>> + dev_err(it->dev, "failed to read EDID:%d\n", ret);
>> + return ret;
>> + }
>> +
>> + if (val & DDC_ERROR) {
>> + dev_err(it->dev, "DDC error\n");
>> + return -EIO;
>> + }
>> +
>> + /* cache to buffer */
>> + for (; count > 0; count--) {
>> + regmap_read(regmap, HDMI_REG_DDC_READFIFO, &val);
>> + *(buf++) = val;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int it6263_connector_get_modes(struct drm_connector *connector)
>> +{
>> + struct it6263 *it = connector_to_it6263(connector);
>> + const struct drm_edid *drm_edid;
>> + int count;
>> +
>> + drm_edid = drm_edid_read_custom(connector, it6263_read_edid, it);
>> +
>> + drm_edid_connector_update(connector, drm_edid);
>> + count = drm_edid_connector_add_modes(connector);
>> +
>> + drm_edid_free(drm_edid);
>> +
>> + return count;
>> +}
>> +
>> +static const struct drm_connector_helper_funcs it6263_connector_helper_funcs = {
>> + .get_modes = it6263_connector_get_modes,
>> +};
>> +
>> +static int it6263_bridge_atomic_check(struct drm_bridge *bridge,
>> + struct drm_bridge_state *bridge_state,
>> + struct drm_crtc_state *crtc_state,
>> + struct drm_connector_state *conn_state)
>> +{
>> + struct drm_display_mode *mode = &crtc_state->adjusted_mode;
>
> Use drm_atomic_helper_connector_hdmi_check().
Will take a look at this.
>
> Implement .hdmi_tmds_char_rate_valid(). Also, I think, single and dual
Will take a look at this.
> link LVDS have different max clock rates. Please correct me if I'm
> wrong.
Yes, I think so too. But, I don't know the exact max clock rates.
IT6263 data sheet only says LVDS RX supports clock rate up to
150MHz.
>
>> +
>> + return mode->clock > MAX_PIXEL_CLOCK_KHZ ? -EINVAL : 0;
>> +}
>> +
>> +static void
>> +it6263_bridge_atomic_disable(struct drm_bridge *bridge,
>> + struct drm_bridge_state *old_bridge_state)
>> +{
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> +
>> + regmap_write_bits(it->hdmi_regmap, HDMI_REG_GCP, AVMUTE, AVMUTE);
>> + regmap_write(it->hdmi_regmap, HDMI_REG_PKT_GENERAL_CTRL, 0);
>> + regmap_write(it->hdmi_regmap, HDMI_REG_AFE_DRV_CTRL,
>> + AFE_DRV_RST | AFE_DRV_PWD);
>> +}
>> +
>> +static void
>> +it6263_hdmi_avi_infoframe_configure(struct it6263 *it,
>> + struct drm_connector *connector,
>> + const struct drm_display_mode *mode)
>
> -> .hdmi_write_infoframe() , .hdmi_clear_infoframe().
Will take a look at them.
>
>> +{
>> + struct hdmi_avi_infoframe frame;
>> + u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
>> + int ret;
>> +
>> + ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, connector, mode);
>> + if (ret) {
>> + dev_err(it->dev, "failed to setup AVI infoframe: %d\n", ret);
>> + return;
>> + }
>> +
>> + ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
>> + if (ret < 0) {
>> + dev_err(it->dev, "failed to pack infoframe: %d\n", ret);
>> + return;
>> + }
>> +
>> + /* write the first AVI infoframe data byte chunk(DB1-DB5) */
>> + ret = regmap_bulk_write(it->hdmi_regmap, HDMI_REG_AVI_DB1,
>> + &buf[HDMI_INFOFRAME_HEADER_SIZE],
>> + HDMI_AVI_DB_CHUNK1_SIZE);
>> + if (ret) {
>> + dev_err(it->dev, "failed to write the 1st AVI infoframe data byte chunk: %d\n",
>> + ret);
>> + return;
>> + }
>> +
>> + /* write the second AVI infoframe data byte chunk(DB6-DB13) */
>> + ret = regmap_bulk_write(it->hdmi_regmap, HDMI_REG_AVI_DB6,
>> + &buf[HDMI_INFOFRAME_HEADER_SIZE +
>> + HDMI_AVI_DB_CHUNK1_SIZE],
>> + HDMI_AVI_DB_CHUNK2_SIZE);
>> + if (ret) {
>> + dev_err(it->dev, "failed to write the 2nd AVI infoframe data byte chunk: %d\n",
>> + ret);
>> + return;
>> + }
>> +
>> + ret = regmap_write(it->hdmi_regmap, HDMI_REG_AVI_CSUM, buf[3]);
>> + if (ret)
>> + dev_err(it->dev, "failed to set AVI infoframe checksum: %d\n",
>> + ret);
>> +}
>> +
>> +static void
>> +it6263_bridge_atomic_enable(struct drm_bridge *bridge,
>> + struct drm_bridge_state *old_bridge_state)
>> +{
>> + struct drm_atomic_state *state = old_bridge_state->base.state;
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> + const struct drm_crtc_state *crtc_state;
>> + struct regmap *regmap = it->hdmi_regmap;
>> + const struct drm_display_mode *mode;
>> + struct drm_connector *connector;
>> + bool is_stable = false;
>> + struct drm_crtc *crtc;
>> + unsigned int val;
>> + bool pclk_high;
>> + int i, ret;
>> +
>> + connector = drm_atomic_get_new_connector_for_encoder(state,
>> + bridge->encoder);
>> + crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
>> + crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
>> + mode = &crtc_state->adjusted_mode;
>> +
>> + regmap_write(regmap, HDMI_REG_HDMI_MODE, TX_HDMI_MODE);
>> +
>> + it6263_hdmi_avi_infoframe_configure(it, connector, mode);
>
> drm_atomic_helper_connector_hdmi_update_infoframes
Will take a look at this.
>
>> +
>> + /* HDMI AFE setup */
>> + pclk_high = mode->clock > HIGH_PIXEL_CLOCK_KHZ ? true : false;
>> + regmap_write(regmap, HDMI_REG_AFE_DRV_CTRL, AFE_DRV_RST);
>> + if (pclk_high)
>> + regmap_write(regmap, HDMI_REG_AFE_XP_CTRL,
>> + AFE_XP_GAINBIT | AFE_XP_RESETB);
>> + else
>> + regmap_write(regmap, HDMI_REG_AFE_XP_CTRL,
>> + AFE_XP_ER0 | AFE_XP_RESETB);
>> + regmap_write(regmap, HDMI_REG_AFE_ISW_CTRL, 0x10);
>> + if (pclk_high)
>> + regmap_write(regmap, HDMI_REG_AFE_IP_CTRL,
>> + AFE_IP_GAINBIT | AFE_IP_RESETB);
>> + else
>> + regmap_write(regmap, HDMI_REG_AFE_IP_CTRL,
>> + AFE_IP_ER0 | AFE_IP_RESETB);
>> +
>> + /* HDMI software video reset */
>> + regmap_write_bits(regmap, HDMI_REG_SW_RST, SOFTV_RST, SOFTV_RST);
>> + fsleep(1000);
>> + regmap_write_bits(regmap, HDMI_REG_SW_RST, SOFTV_RST, 0);
>> +
>> + /* reconfigure LVDS and retry several times in case video is instable */
>> + for (i = 0; i < 3; i++) {
>> + ret = regmap_read_poll_timeout(regmap, HDMI_REG_SYS_STATUS, val,
>> + val & TXVIDSTABLE,
>> + 20000, 500000);
>> + if (!ret) {
>> + is_stable = true;
>> + break;
>> + }
>> +
>> + it6263_lvds_config(it);
>> + }
>> +
>> + if (!is_stable)
>> + dev_warn(it->dev, "failed to wait for video stable\n");
>> +
>> + /* HDMI AFE reset release and power up */
>> + regmap_write(regmap, HDMI_REG_AFE_DRV_CTRL, 0);
>> +
>> + regmap_write_bits(regmap, HDMI_REG_GCP, AVMUTE, 0);
>> +
>> + regmap_write(regmap, HDMI_REG_PKT_GENERAL_CTRL, ENABLE_PKT | REPEAT_PKT);
>> +}
>> +
>> +static enum drm_mode_status
>> +it6263_bridge_mode_valid(struct drm_bridge *bridge,
>> + const struct drm_display_info *info,
>> + const struct drm_display_mode *mode)
>> +{
>> + return mode->clock > MAX_PIXEL_CLOCK_KHZ ? MODE_CLOCK_HIGH : MODE_OK;
>
> rate = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
> return bridge->funcs->hdmi_tmds_char_rate_valid(bridge, mode, rate);
Will look into the two lines.
>
>> +}
>> +
>> +static int it6263_bridge_attach(struct drm_bridge *bridge,
>> + enum drm_bridge_attach_flags flags)
>> +{
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> + int ret;
>> +
>> + ret = drm_bridge_attach(bridge->encoder, it->next_bridge, bridge,
>> + flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>> + if (ret < 0)
>> + return ret;
>> +
>> + if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
>> + return 0;
>> +
>> + it->connector.polled = DRM_CONNECTOR_POLL_CONNECT |
>> + DRM_CONNECTOR_POLL_DISCONNECT;
>> +
>
> Please strongly consider dropping this and using drm_bridge_connector in
> the host driver.
I can't afford to make i.MX8MP imx-lcdif KMS use drm_bridge_connector
currently. Maybe the Renesas RZ/G3E SMARC EVK Biju tested v1 patch
set with is also not using drm_bridge_connector. I hope we can leave
it as-is for now.
>
>> + ret = drm_connector_init(bridge->dev, &it->connector,
>> + &it6263_connector_funcs,
>> + DRM_MODE_CONNECTOR_HDMIA);
>> + if (ret)
>> + return ret;
>> +
>> + drm_connector_helper_add(&it->connector,
>> + &it6263_connector_helper_funcs);
>> + drm_connector_attach_encoder(&it->connector, bridge->encoder);
>> +
>> + return 0;
>> +}
>> +
>> +static enum drm_connector_status it6263_bridge_detect(struct drm_bridge *bridge)
>> +{
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> +
>> + return it6263_detect(it);
>> +}
>> +
>> +static const struct drm_edid *
>> +it6263_bridge_edid_read(struct drm_bridge *bridge,
>> + struct drm_connector *connector)
>> +{
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> +
>> + return drm_edid_read_custom(connector, it6263_read_edid, it);
>> +}
>> +
>> +static u32 *
>> +it6263_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
>> + struct drm_bridge_state *bridge_state,
>> + struct drm_crtc_state *crtc_state,
>> + struct drm_connector_state *conn_state,
>> + u32 output_fmt,
>> + unsigned int *num_input_fmts)
>> +{
>> + struct it6263 *it = bridge_to_it6263(bridge);
>> + u32 *input_fmts;
>> +
>> + *num_input_fmts = 0;
>> +
>> + if (it->lvds_link_num_dlanes == 3)
>> + return NULL;
>> +
>> + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
>> + if (!input_fmts)
>> + return NULL;
>> +
>> + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
>> + *num_input_fmts = 1;
>> +
>> + return input_fmts;
>> +}
>> +
>> +static const struct drm_bridge_funcs it6263_bridge_funcs = {
>> + .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,
>> + .attach = it6263_bridge_attach,
>> + .mode_valid = it6263_bridge_mode_valid,
>> + .atomic_disable = it6263_bridge_atomic_disable,
>> + .atomic_enable = it6263_bridge_atomic_enable,
>> + .atomic_check = it6263_bridge_atomic_check,
>> + .detect = it6263_bridge_detect,
>> + .edid_read = it6263_bridge_edid_read,
>> + .atomic_get_input_bus_fmts = it6263_bridge_atomic_get_input_bus_fmts,
>> +};
>> +
>> +static int it6263_probe(struct i2c_client *client)
>> +{
>> + struct device *dev = &client->dev;
>> + struct it6263 *it;
>> + int ret;
>> +
>> + it = devm_kzalloc(dev, sizeof(*it), GFP_KERNEL);
>> + if (!it)
>> + return -ENOMEM;
>> +
>> + it->dev = dev;
>> + it->hdmi_i2c = client;
>> +
>> + it->hdmi_regmap = devm_regmap_init_i2c(client,
>> + &it6263_hdmi_regmap_config);
>> + if (IS_ERR(it->hdmi_regmap))
>> + return dev_err_probe(dev, PTR_ERR(it->hdmi_regmap),
>> + "failed to init I2C regmap for HDMI\n");
>> +
>> + it->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
>> + if (IS_ERR(it->reset_gpio))
>> + return dev_err_probe(dev, PTR_ERR(it->reset_gpio),
>> + "failed to get reset gpio\n");
>> +
>> + ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(it6263_supplies),
>> + it6263_supplies);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "failed to get power supplies\n");
>> +
>> + ret = it6263_parse_dt(it);
>> + if (ret)
>> + return ret;
>> +
>> + it6263_hw_reset(it);
>> +
>> + ret = it6263_lvds_set_i2c_addr(it);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "failed to set I2C addr\n");
>> +
>> + it->lvds_i2c = devm_i2c_new_dummy_device(dev, client->adapter,
>> + LVDS_INPUT_CTRL_I2C_ADDR);
>> + if (IS_ERR(it->lvds_i2c))
>> + dev_err_probe(it->dev, PTR_ERR(it->lvds_i2c),
>> + "failed to allocate I2C device for LVDS\n");
>> +
>> + it->lvds_regmap = devm_regmap_init_i2c(it->lvds_i2c,
>> + &it6263_lvds_regmap_config);
>> + if (IS_ERR(it->lvds_regmap))
>> + return dev_err_probe(dev, PTR_ERR(it->lvds_regmap),
>> + "failed to init I2C regmap for LVDS\n");
>> +
>> + it6263_lvds_config(it);
>> + it6263_hdmi_config(it);
>> +
>> + i2c_set_clientdata(client, it);
>> +
>> + it->bridge.funcs = &it6263_bridge_funcs;
>> + it->bridge.of_node = dev->of_node;
>> + it->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT;
>
> | DRM_BRIDGE_OP_HDMI
Will take a look at this.
>
> BTW: No HPD IRQ support?
IT6263 chip doesn't support HPD IRQ.
>
>> + it->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>> + drm_bridge_add(&it->bridge);
>
> devm_drm_bridge_add()
Will try to use this. Thanks.
>
>> +
>> + return 0;
>> +}
>> +
>> +static void it6263_remove(struct i2c_client *client)
>> +{
>> + struct it6263 *it = i2c_get_clientdata(client);
>> +
>> + drm_bridge_remove(&it->bridge);
>
> Remove, it becomes unused with the devm_ function.
>
>> +}
>> +
>> +static const struct of_device_id it6263_of_match[] = {
>> + { .compatible = "ite,it6263", },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, it6263_of_match);
>> +
>> +static const struct i2c_device_id it6263_i2c_ids[] = {
>> + { "it6263", 0 },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(i2c, it6263_i2c_ids);
>> +
>> +static struct i2c_driver it6263_driver = {
>> + .probe = it6263_probe,
>> + .remove = it6263_remove,
>> + .driver = {
>> + .name = "it6263",
>> + .of_match_table = it6263_of_match,
>> + },
>> + .id_table = it6263_i2c_ids,
>> +};
>> +module_i2c_driver(it6263_driver);
>> +
>> +MODULE_DESCRIPTION("ITE Tech. Inc. IT6263 LVDS/HDMI bridge");
>> +MODULE_AUTHOR("Liu Ying <victor.liu@xxxxxxx>");
>> +MODULE_LICENSE("GPL");
>> --
>> 2.34.1
>>
>
--
Regards,
Liu Ying