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Message-ID:
<TYWPR01MB11343E3DE82874B557B537B6186762@TYWPR01MB11343.jpnprd01.prod.outlook.com>
Date: Mon, 30 Sep 2024 09:16:11 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Liu Ying <victor.liu@....com>, "dri-devel@...ts.freedesktop.org"
<dri-devel@...ts.freedesktop.org>, "devicetree@...r.kernel.org"
<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
CC: "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
"neil.armstrong@...aro.org" <neil.armstrong@...aro.org>, "rfoss@...nel.org"
<rfoss@...nel.org>, laurent.pinchart <laurent.pinchart@...asonboard.com>,
"jonas@...boo.se" <jonas@...boo.se>, "jernej.skrabec@...il.com"
<jernej.skrabec@...il.com>, "maarten.lankhorst@...ux.intel.com"
<maarten.lankhorst@...ux.intel.com>, "mripard@...nel.org"
<mripard@...nel.org>, "tzimmermann@...e.de" <tzimmermann@...e.de>,
"airlied@...il.com" <airlied@...il.com>, "simona@...ll.ch" <simona@...ll.ch>,
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<y.moog@...tec.de>
Subject: RE: [PATCH 6/8] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
Hi Liu,
Thanks for the patch.
> -----Original Message-----
> From: linux-arm-kernel <linux-arm-kernel-bounces@...ts.infradead.org> On Behalf Of Liu Ying
> Sent: Monday, September 30, 2024 6:29 AM
> Subject: [PATCH 6/8] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
>
> 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@....com>
> ---
> drivers/gpu/drm/bridge/Kconfig | 8 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/ite-it6263.c | 829 ++++++++++++++++++++++++++++
> 3 files changed, 838 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..886588497bc1
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/ite-it6263.c
> @@ -0,0 +1,829 @@
> +// 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/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 AVI_DB1_COLOR_SPACE GENMASK(6, 5)
> +#define AVI_COLOR_SPACE_RGB FIELD_PREP(AVI_DB1_COLOR_SPACE, 0)
> +
> +#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;
> + 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:
> + 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_DB1,
> + .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_DB1,
> + .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 = 0;
> +
> + 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;
> + } 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");
Are you supporting single input LVDS port0??
> + } 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_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);
What about other resets ??
/* AFE PLL reset and pclk reset */
> +}
> +
> +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);
> + regmap_write_bits(it->hdmi_regmap, HDMI_REG_AVI_DB1,
> + AVI_DB1_COLOR_SPACE, AVI_COLOR_SPACE_RGB); }
> +
> +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;
> +
> + 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_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);
> +
> + /* 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;
> +}
> +
> +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;
> +
> + 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)
> +{
> + u32 *input_fmts;
> +
> + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
> + if (!input_fmts) {
> + *num_input_fmts = 0;
> + return NULL;
> + }
> +
> + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
Why is it hardcoded? What about supporting VESA??
> + *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_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");
Maybe use action_or_reset and call i2c_unregister_device();
> +
> + 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;
it->bridge.type = DRM_MODE_CONNECTOR_HDMIA; ??
> + drm_bridge_add(&it->bridge);
> +
> + return 0;
> +}
> +
> +static void it6263_remove(struct i2c_client *client) {
> + struct it6263 *it = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&it->bridge);
> +}
> +
> +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@....com>"); MODULE_LICENSE("GPL");
> --
> 2.34.1
>
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