// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Copyright (c) 2018 Rockchip Electronics Co. Ltd.
|
*/
|
|
#include <linux/kernel.h>
|
#include <linux/delay.h>
|
#include <linux/gpio.h>
|
#include <linux/gpio/consumer.h>
|
#include <linux/i2c.h>
|
#include <linux/module.h>
|
#include <linux/of.h>
|
#include <linux/of_irq.h>
|
#include <linux/of_graph.h>
|
#include <linux/regmap.h>
|
#include <video/of_display_timing.h>
|
|
#include <drm/drmP.h>
|
#include <drm/drm_of.h>
|
#include <drm/drm_atomic.h>
|
#include <drm/drm_crtc_helper.h>
|
#include <drm/drm_atomic_helper.h>
|
#include <drm/drm_panel.h>
|
#include <drm/drm_mipi_dsi.h>
|
|
struct lt8912 {
|
struct drm_bridge bridge;
|
struct drm_connector connector;
|
struct drm_display_mode mode;
|
struct device *dev;
|
struct mipi_dsi_device *dsi;
|
struct regmap *regmap[3];
|
struct gpio_desc *reset_n;
|
};
|
|
static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
|
{
|
return container_of(b, struct lt8912, bridge);
|
}
|
|
static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
|
{
|
return container_of(c, struct lt8912, connector);
|
}
|
|
/* LT8912 MIPI to HDMI & LVDS REG setting - 20180115.txt */
|
static void lt8912_init(struct lt8912 *lt8912)
|
{
|
u8 lanes = lt8912->dsi->lanes;
|
const struct drm_display_mode *mode = <8912->mode;
|
u32 hactive, hfp, hsync, hbp, vfp, vsync, vbp, htotal, vtotal;
|
unsigned int version[2];
|
|
/* TODO: lvds output init */
|
|
hactive = mode->hdisplay;
|
hfp = mode->hsync_start - mode->hdisplay;
|
hsync = mode->hsync_end - mode->hsync_start;
|
hbp = mode->htotal - mode->hsync_end;
|
vfp = mode->vsync_start - mode->vdisplay;
|
vsync = mode->vsync_end - mode->vsync_start;
|
vbp = mode->vtotal - mode->vsync_end;
|
htotal = mode->htotal;
|
vtotal = mode->vtotal;
|
|
regmap_read(lt8912->regmap[0], 0x00, &version[0]);
|
regmap_read(lt8912->regmap[0], 0x01, &version[1]);
|
|
dev_info(lt8912->dev, "LT8912 ID: %02x, %02x\n",
|
version[0], version[1]);
|
|
/* DigitalClockEn */
|
regmap_write(lt8912->regmap[0], 0x08, 0xff);
|
regmap_write(lt8912->regmap[0], 0x09, 0x81);
|
regmap_write(lt8912->regmap[0], 0x0a, 0xff);
|
regmap_write(lt8912->regmap[0], 0x0b, 0x64);
|
regmap_write(lt8912->regmap[0], 0x0c, 0xff);
|
|
regmap_write(lt8912->regmap[0], 0x44, 0x31);
|
regmap_write(lt8912->regmap[0], 0x51, 0x1f);
|
|
/* TxAnalog */
|
regmap_write(lt8912->regmap[0], 0x31, 0xa1);
|
regmap_write(lt8912->regmap[0], 0x32, 0xa1);
|
regmap_write(lt8912->regmap[0], 0x33, 0x03);
|
regmap_write(lt8912->regmap[0], 0x37, 0x00);
|
regmap_write(lt8912->regmap[0], 0x38, 0x22);
|
regmap_write(lt8912->regmap[0], 0x60, 0x82);
|
|
/* CbusAnalog */
|
regmap_write(lt8912->regmap[0], 0x39, 0x45);
|
regmap_write(lt8912->regmap[0], 0x3b, 0x00);
|
|
/* HDMIPllAnalog */
|
regmap_write(lt8912->regmap[0], 0x44, 0x31);
|
regmap_write(lt8912->regmap[0], 0x55, 0x44);
|
regmap_write(lt8912->regmap[0], 0x57, 0x01);
|
regmap_write(lt8912->regmap[0], 0x5a, 0x02);
|
|
/* MipiBasicSet */
|
regmap_write(lt8912->regmap[1], 0x10, 0x01);
|
regmap_write(lt8912->regmap[1], 0x11, 0x08);
|
regmap_write(lt8912->regmap[1], 0x12, 0x04);
|
regmap_write(lt8912->regmap[1], 0x13, lanes % 4);
|
regmap_write(lt8912->regmap[1], 0x14, 0x00);
|
|
regmap_write(lt8912->regmap[1], 0x15, 0x00);
|
regmap_write(lt8912->regmap[1], 0x1a, 0x03);
|
regmap_write(lt8912->regmap[1], 0x1b, 0x03);
|
|
/* MIPIDig */
|
regmap_write(lt8912->regmap[1], 0x18, hsync);
|
regmap_write(lt8912->regmap[1], 0x19, vsync);
|
regmap_write(lt8912->regmap[1], 0x1c, hactive);
|
regmap_write(lt8912->regmap[1], 0x1d, hactive >> 8);
|
|
regmap_write(lt8912->regmap[1], 0x1e, 0x67);
|
regmap_write(lt8912->regmap[1], 0x2f, 0x0c);
|
|
regmap_write(lt8912->regmap[1], 0x34, htotal);
|
regmap_write(lt8912->regmap[1], 0x35, htotal >> 8);
|
regmap_write(lt8912->regmap[1], 0x36, vtotal);
|
regmap_write(lt8912->regmap[1], 0x37, vtotal >> 8);
|
regmap_write(lt8912->regmap[1], 0x38, vbp);
|
regmap_write(lt8912->regmap[1], 0x39, vbp >> 8);
|
regmap_write(lt8912->regmap[1], 0x3a, vfp);
|
regmap_write(lt8912->regmap[1], 0x3b, vfp >> 8);
|
regmap_write(lt8912->regmap[1], 0x3c, hbp);
|
regmap_write(lt8912->regmap[1], 0x3d, hbp >> 8);
|
regmap_write(lt8912->regmap[1], 0x3e, hfp);
|
regmap_write(lt8912->regmap[1], 0x3f, hfp >> 8);
|
|
/* DDSConfig */
|
regmap_write(lt8912->regmap[1], 0x4e, 0x52);
|
regmap_write(lt8912->regmap[1], 0x4f, 0xde);
|
regmap_write(lt8912->regmap[1], 0x50, 0xc0);
|
regmap_write(lt8912->regmap[1], 0x51, 0x80);
|
regmap_write(lt8912->regmap[1], 0x51, 0x00);
|
|
regmap_write(lt8912->regmap[1], 0x1f, 0x5e);
|
regmap_write(lt8912->regmap[1], 0x20, 0x01);
|
regmap_write(lt8912->regmap[1], 0x21, 0x2c);
|
regmap_write(lt8912->regmap[1], 0x22, 0x01);
|
regmap_write(lt8912->regmap[1], 0x23, 0xfa);
|
regmap_write(lt8912->regmap[1], 0x24, 0x00);
|
regmap_write(lt8912->regmap[1], 0x25, 0xc8);
|
regmap_write(lt8912->regmap[1], 0x26, 0x00);
|
regmap_write(lt8912->regmap[1], 0x27, 0x5e);
|
regmap_write(lt8912->regmap[1], 0x28, 0x01);
|
regmap_write(lt8912->regmap[1], 0x29, 0x2c);
|
regmap_write(lt8912->regmap[1], 0x2a, 0x01);
|
regmap_write(lt8912->regmap[1], 0x2b, 0xfa);
|
regmap_write(lt8912->regmap[1], 0x2c, 0x00);
|
regmap_write(lt8912->regmap[1], 0x2d, 0xc8);
|
regmap_write(lt8912->regmap[1], 0x2e, 0x00);
|
|
regmap_write(lt8912->regmap[0], 0x03, 0x7f);
|
usleep_range(10000, 20000);
|
regmap_write(lt8912->regmap[0], 0x03, 0xff);
|
|
regmap_write(lt8912->regmap[1], 0x42, 0x64);
|
regmap_write(lt8912->regmap[1], 0x43, 0x00);
|
regmap_write(lt8912->regmap[1], 0x44, 0x04);
|
regmap_write(lt8912->regmap[1], 0x45, 0x00);
|
regmap_write(lt8912->regmap[1], 0x46, 0x59);
|
regmap_write(lt8912->regmap[1], 0x47, 0x00);
|
regmap_write(lt8912->regmap[1], 0x48, 0xf2);
|
regmap_write(lt8912->regmap[1], 0x49, 0x06);
|
regmap_write(lt8912->regmap[1], 0x4a, 0x00);
|
regmap_write(lt8912->regmap[1], 0x4b, 0x72);
|
regmap_write(lt8912->regmap[1], 0x4c, 0x45);
|
regmap_write(lt8912->regmap[1], 0x4d, 0x00);
|
regmap_write(lt8912->regmap[1], 0x52, 0x08);
|
regmap_write(lt8912->regmap[1], 0x53, 0x00);
|
regmap_write(lt8912->regmap[1], 0x54, 0xb2);
|
regmap_write(lt8912->regmap[1], 0x55, 0x00);
|
regmap_write(lt8912->regmap[1], 0x56, 0xe4);
|
regmap_write(lt8912->regmap[1], 0x57, 0x0d);
|
regmap_write(lt8912->regmap[1], 0x58, 0x00);
|
regmap_write(lt8912->regmap[1], 0x59, 0xe4);
|
regmap_write(lt8912->regmap[1], 0x5a, 0x8a);
|
regmap_write(lt8912->regmap[1], 0x5b, 0x00);
|
regmap_write(lt8912->regmap[1], 0x5c, 0x34);
|
regmap_write(lt8912->regmap[1], 0x1e, 0x4f);
|
regmap_write(lt8912->regmap[1], 0x51, 0x00);
|
|
regmap_write(lt8912->regmap[0], 0xb2, 0x01);
|
|
/* AudioIIsEn */
|
regmap_write(lt8912->regmap[2], 0x06, 0x08);
|
regmap_write(lt8912->regmap[2], 0x07, 0xf0);
|
|
regmap_write(lt8912->regmap[2], 0x34, 0xd2);
|
|
regmap_write(lt8912->regmap[2], 0x3c, 0x41);
|
|
/* MIPIRxLogicRes */
|
regmap_write(lt8912->regmap[0], 0x03, 0x7f);
|
usleep_range(10000, 20000);
|
regmap_write(lt8912->regmap[0], 0x03, 0xff);
|
|
regmap_write(lt8912->regmap[1], 0x51, 0x80);
|
usleep_range(10000, 20000);
|
regmap_write(lt8912->regmap[1], 0x51, 0x00);
|
}
|
|
static void lt8912_exit(struct lt8912 *lt8912)
|
{
|
regmap_write(lt8912->regmap[0], 0x08, 0x00);
|
regmap_write(lt8912->regmap[0], 0x09, 0x81);
|
regmap_write(lt8912->regmap[0], 0x0a, 0x00);
|
regmap_write(lt8912->regmap[0], 0x0b, 0x20);
|
regmap_write(lt8912->regmap[0], 0x0c, 0x00);
|
|
regmap_write(lt8912->regmap[0], 0x54, 0x1d);
|
regmap_write(lt8912->regmap[0], 0x51, 0x15);
|
|
regmap_write(lt8912->regmap[0], 0x44, 0x31);
|
regmap_write(lt8912->regmap[0], 0x41, 0xbd);
|
regmap_write(lt8912->regmap[0], 0x5c, 0x11);
|
|
regmap_write(lt8912->regmap[0], 0x30, 0x08);
|
regmap_write(lt8912->regmap[0], 0x31, 0x00);
|
regmap_write(lt8912->regmap[0], 0x32, 0x00);
|
regmap_write(lt8912->regmap[0], 0x33, 0x00);
|
regmap_write(lt8912->regmap[0], 0x34, 0x00);
|
regmap_write(lt8912->regmap[0], 0x35, 0x00);
|
regmap_write(lt8912->regmap[0], 0x36, 0x00);
|
regmap_write(lt8912->regmap[0], 0x37, 0x00);
|
regmap_write(lt8912->regmap[0], 0x38, 0x00);
|
}
|
|
static void lt8912_power_on(struct lt8912 *lt8912)
|
{
|
gpiod_direction_output(lt8912->reset_n, 1);
|
msleep(120);
|
gpiod_direction_output(lt8912->reset_n, 0);
|
}
|
|
static void lt8912_power_off(struct lt8912 *lt8912)
|
{
|
gpiod_direction_output(lt8912->reset_n, 1);
|
}
|
|
static enum drm_connector_status
|
lt8912_connector_detect(struct drm_connector *connector, bool force)
|
{
|
/* TODO: HPD handing (reg[0xc1] - bit[7]) */
|
return connector_status_connected;
|
}
|
|
static const struct drm_connector_funcs lt8912_connector_funcs = {
|
.dpms = drm_atomic_helper_connector_dpms,
|
.detect = lt8912_connector_detect,
|
.fill_modes = drm_helper_probe_single_connector_modes,
|
.destroy = drm_connector_cleanup,
|
.reset = drm_atomic_helper_connector_reset,
|
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
|
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
|
};
|
|
static struct drm_encoder *
|
lt8912_connector_best_encoder(struct drm_connector *connector)
|
{
|
struct lt8912 *lt8912 = connector_to_lt8912(connector);
|
|
return lt8912->bridge.encoder;
|
}
|
|
static int lt8912_connector_get_modes(struct drm_connector *connector)
|
{
|
int num_modes = 0;
|
|
num_modes = drm_add_modes_noedid(connector, 1920, 1080);
|
drm_set_preferred_mode(connector, 1920, 1080);
|
|
return num_modes;
|
}
|
|
static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
|
.get_modes = lt8912_connector_get_modes,
|
.best_encoder = lt8912_connector_best_encoder,
|
};
|
|
static void lt8912_bridge_post_disable(struct drm_bridge *bridge)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
|
lt8912_power_off(lt8912);
|
}
|
|
static void lt8912_bridge_disable(struct drm_bridge *bridge)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
|
lt8912_exit(lt8912);
|
}
|
|
static void lt8912_bridge_enable(struct drm_bridge *bridge)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
|
lt8912_init(lt8912);
|
}
|
|
static void lt8912_bridge_pre_enable(struct drm_bridge *bridge)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
|
lt8912_power_on(lt8912);
|
}
|
|
static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
|
struct drm_display_mode *mode,
|
struct drm_display_mode *adj)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
|
drm_mode_copy(<8912->mode, adj);
|
}
|
|
static int lt8912_bridge_attach(struct drm_bridge *bridge)
|
{
|
struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
|
struct drm_connector *connector = <8912->connector;
|
int ret;
|
|
ret = drm_connector_init(bridge->dev, connector,
|
<8912_connector_funcs,
|
DRM_MODE_CONNECTOR_HDMIA);
|
if (ret) {
|
dev_err(lt8912->dev, "failed to initialize connector\n");
|
return ret;
|
}
|
|
drm_connector_helper_add(connector, <8912_connector_helper_funcs);
|
drm_mode_connector_attach_encoder(connector, bridge->encoder);
|
|
return 0;
|
}
|
|
static const struct drm_bridge_funcs lt8912_bridge_funcs = {
|
.attach = lt8912_bridge_attach,
|
.mode_set = lt8912_bridge_mode_set,
|
.pre_enable = lt8912_bridge_pre_enable,
|
.enable = lt8912_bridge_enable,
|
.disable = lt8912_bridge_disable,
|
.post_disable = lt8912_bridge_post_disable,
|
};
|
|
static const struct regmap_config lt8912_regmap_config = {
|
.reg_bits = 8,
|
.val_bits = 8,
|
.max_register = 0xff,
|
};
|
|
static int lt8912_i2c_init(struct lt8912 *lt8912,
|
struct i2c_adapter *adapter)
|
{
|
struct i2c_board_info info[] = {
|
{ I2C_BOARD_INFO("lt8912p0", 0x48), },
|
{ I2C_BOARD_INFO("lt8912p1", 0x49), },
|
{ I2C_BOARD_INFO("lt8912p2", 0x4a), }
|
};
|
struct regmap *regmap;
|
unsigned int i;
|
int ret;
|
|
for (i = 0; i < ARRAY_SIZE(info); i++) {
|
struct i2c_client *client;
|
|
client = i2c_new_device(adapter, &info[i]);
|
if (!client)
|
return -ENODEV;
|
|
regmap = devm_regmap_init_i2c(client, <8912_regmap_config);
|
if (IS_ERR(regmap)) {
|
ret = PTR_ERR(regmap);
|
dev_err(lt8912->dev,
|
"Failed to initialize regmap: %d\n", ret);
|
return ret;
|
}
|
|
lt8912->regmap[i] = regmap;
|
}
|
|
return 0;
|
}
|
|
static int lt8912_probe(struct mipi_dsi_device *dsi)
|
{
|
struct device *dev = &dsi->dev;
|
struct lt8912 *lt8912;
|
struct device_node *node;
|
struct i2c_adapter *adapter;
|
int ret;
|
|
lt8912 = devm_kzalloc(dev, sizeof(*lt8912), GFP_KERNEL);
|
if (!lt8912)
|
return -ENOMEM;
|
|
lt8912->dev = dev;
|
lt8912->dsi = dsi;
|
mipi_dsi_set_drvdata(dsi, lt8912);
|
|
lt8912->reset_n = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
|
if (IS_ERR(lt8912->reset_n)) {
|
ret = PTR_ERR(lt8912->reset_n);
|
dev_err(dev, "failed to request reset GPIO: %d\n", ret);
|
return ret;
|
}
|
|
node = of_parse_phandle(dev->of_node, "i2c-bus", 0);
|
if (!node) {
|
dev_err(dev, "No i2c-bus found\n");
|
return -ENODEV;
|
}
|
|
adapter = of_find_i2c_adapter_by_node(node);
|
of_node_put(node);
|
if (!adapter) {
|
dev_err(dev, "No i2c adapter found\n");
|
return -EPROBE_DEFER;
|
}
|
|
ret = lt8912_i2c_init(lt8912, adapter);
|
if (ret)
|
return ret;
|
|
/* TODO: interrupt handing */
|
|
lt8912->bridge.funcs = <8912_bridge_funcs;
|
lt8912->bridge.of_node = dev->of_node;
|
ret = drm_bridge_add(<8912->bridge);
|
if (ret) {
|
dev_err(dev, "failed to add bridge: %d\n", ret);
|
return ret;
|
}
|
|
dsi->lanes = 4;
|
dsi->format = MIPI_DSI_FMT_RGB888;
|
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
|
MIPI_DSI_MODE_VIDEO_HBP | MIPI_DSI_MODE_LPM |
|
MIPI_DSI_MODE_EOT_PACKET;
|
|
ret = mipi_dsi_attach(dsi);
|
if (ret) {
|
drm_bridge_remove(<8912->bridge);
|
dev_err(dev, "failed to attach dsi to host: %d\n", ret);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static int lt8912_remove(struct mipi_dsi_device *dsi)
|
{
|
struct lt8912 *lt8912 = mipi_dsi_get_drvdata(dsi);
|
|
mipi_dsi_detach(dsi);
|
drm_bridge_remove(<8912->bridge);
|
|
return 0;
|
}
|
|
static const struct of_device_id lt8912_of_match[] = {
|
{ .compatible = "lontium,lt8912" },
|
{}
|
};
|
MODULE_DEVICE_TABLE(of, lt8912_of_match);
|
|
static struct mipi_dsi_driver lt8912_driver = {
|
.driver = {
|
.name = "lt8912",
|
.of_match_table = lt8912_of_match,
|
},
|
.probe = lt8912_probe,
|
.remove = lt8912_remove,
|
};
|
module_mipi_dsi_driver(lt8912_driver);
|
|
MODULE_AUTHOR("Wyon Bi <bivvy.bi@rock-chips.com>");
|
MODULE_DESCRIPTION("Lontium LT8912 MIPI-DSI to LVDS and HDMI/MHL bridge");
|
MODULE_LICENSE("GPL v2");
|
