// SPDX-License-Identifier: GPL-2.0
/*
* Panel driver for the Samsung LMS397KF04 480x800 DPI RGB panel.
* According to the data sheet the display controller is called DB7430.
* Found in the Samsung Galaxy Beam GT-I8350 mobile phone.
* Linus Walleij <linus.walleij@linaro.org>
*/
#include <drm/drm_mipi_dbi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#define DB7430_ACCESS_PROT_OFF 0xb0
#define DB7430_UNKNOWN_B4 0xb4
#define DB7430_USER_SELECT 0xb5
#define DB7430_UNKNOWN_B7 0xb7
#define DB7430_UNKNOWN_B8 0xb8
#define DB7430_PANEL_DRIVING 0xc0
#define DB7430_SOURCE_CONTROL 0xc1
#define DB7430_GATE_INTERFACE 0xc4
#define DB7430_DISPLAY_H_TIMING 0xc5
#define DB7430_RGB_SYNC_OPTION 0xc6
#define DB7430_GAMMA_SET_RED 0xc8
#define DB7430_GAMMA_SET_GREEN 0xc9
#define DB7430_GAMMA_SET_BLUE 0xca
#define DB7430_BIAS_CURRENT_CTRL 0xd1
#define DB7430_DDV_CTRL 0xd2
#define DB7430_GAMMA_CTRL_REF 0xd3
#define DB7430_UNKNOWN_D4 0xd4
#define DB7430_DCDC_CTRL 0xd5
#define DB7430_VCL_CTRL 0xd6
#define DB7430_UNKNOWN_F8 0xf8
#define DB7430_UNKNOWN_FC 0xfc
#define DATA_MASK 0x100
/**
* struct db7430 - state container for a panel controlled by the DB7430
* controller
*/
struct db7430 {
/** @dev: the container device */
struct device *dev;
/** @dbi: the DBI bus abstraction handle */
struct mipi_dbi dbi;
/** @panel: the DRM panel instance for this device */
struct drm_panel panel;
/** @width: the width of this panel in mm */
u32 width;
/** @height: the height of this panel in mm */
u32 height;
/** @reset: reset GPIO line */
struct gpio_desc *reset;
/** @regulators: VCCIO and VIO supply regulators */
struct regulator_bulk_data regulators[2];
};
static const struct drm_display_mode db7430_480_800_mode = {
/*
* 31 ns period min (htotal*vtotal*vrefresh)/1000
* gives a Vrefresh of ~71 Hz.
*/
.clock = 32258,
.hdisplay = 480,
.hsync_start = 480 + 10,
.hsync_end = 480 + 10 + 4,
.htotal = 480 + 10 + 4 + 40,
.vdisplay = 800,
.vsync_start = 800 + 6,
.vsync_end = 800 + 6 + 1,
.vtotal = 800 + 6 + 1 + 7,
.width_mm = 53,
.height_mm = 87,
.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
};
static inline struct db7430 *to_db7430(struct drm_panel *panel)
{
return container_of(panel, struct db7430, panel);
}
static int db7430_power_on(struct db7430 *db)
{
struct mipi_dbi *dbi = &db->dbi;
int ret;
/* Power up */
ret = regulator_bulk_enable(ARRAY_SIZE(db->regulators),
db->regulators);
if (ret) {
dev_err(db->dev, "failed to enable regulators: %d\n", ret);
return ret;
}
msleep(50);
/* Assert reset >=1 ms */
gpiod_set_value_cansleep(db->reset, 1);
usleep_range(1000, 5000);
/* De-assert reset */
gpiod_set_value_cansleep(db->reset, 0);
/* Wait >= 10 ms */
msleep(10);
dev_dbg(db->dev, "de-asserted RESET\n");
/*
* This is set to 0x0a (RGB/BGR order + horizontal flip) in order
* to make the display behave normally. If this is not set the displays
* normal output behaviour is horizontally flipped and BGR ordered. Do
* it twice because the first message doesn't always "take".
*/
mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);
mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);
mipi_dbi_command(dbi, DB7430_ACCESS_PROT_OFF, 0x00);
mipi_dbi_command(dbi, DB7430_PANEL_DRIVING, 0x28, 0x08);
mipi_dbi_command(dbi, DB7430_SOURCE_CONTROL,
0x01, 0x30, 0x15, 0x05, 0x22);
mipi_dbi_command(dbi, DB7430_GATE_INTERFACE,
0x10, 0x01, 0x00);
mipi_dbi_command(dbi, DB7430_DISPLAY_H_TIMING,
0x06, 0x55, 0x03, 0x07, 0x0b,
0x33, 0x00, 0x01, 0x03);
/*
* 0x00 in datasheet 0x01 in vendor code 0x00, it seems 0x01 means
* DE active high and 0x00 means DE active low.
*/
mipi_dbi_command(dbi, DB7430_RGB_SYNC_OPTION, 0x01);
mipi_dbi_command(dbi, DB7430_GAMMA_SET_RED,
/* R positive gamma */ 0x00,
0x0A, 0x31, 0x3B, 0x4E, 0x58, 0x59, 0x5B, 0x58, 0x5E, 0x62,
0x60, 0x61, 0x5E, 0x62, 0x55, 0x55, 0x7F, 0x08,
/* R negative gamma */ 0x00,
0x0A, 0x31, 0x3B, 0x4E, 0x58, 0x59, 0x5B, 0x58, 0x5E, 0x62,
0x60, 0x61, 0x5E, 0x62, 0x55, 0x55, 0x7F, 0x08);
mipi_dbi_command(dbi, DB7430_GAMMA_SET_GREEN,
/* G positive gamma */ 0x00,
0x25, 0x15, 0x28, 0x3D, 0x4A, 0x48, 0x4C, 0x4A, 0x52, 0x59,
0x59, 0x5B, 0x56, 0x60, 0x5D, 0x55, 0x7F, 0x0A,
/* G negative gamma */ 0x00,
0x25, 0x15, 0x28, 0x3D, 0x4A, 0x48, 0x4C, 0x4A, 0x52, 0x59,
0x59, 0x5B, 0x56, 0x60, 0x5D, 0x55, 0x7F, 0x0A);
mipi_dbi_command(dbi, DB7430_GAMMA_SET_BLUE,
/* B positive gamma */ 0x00,
0x48, 0x10, 0x1F, 0x2F, 0x35, 0x38, 0x3D, 0x3C, 0x45, 0x4D,
0x4E, 0x52, 0x51, 0x60, 0x7F, 0x7E, 0x7F, 0x0C,
/* B negative gamma */ 0x00,
0x48, 0x10, 0x1F, 0x2F, 0x35, 0x38, 0x3D, 0x3C, 0x45, 0x4D,
0x4E, 0x52, 0x51, 0x60, 0x7F, 0x7E, 0x7F, 0x0C);
mipi_dbi_command(dbi, DB7430_BIAS_CURRENT_CTRL, 0x33, 0x13);
mipi_dbi_command(dbi, DB7430_DDV_CTRL, 0x11, 0x00, 0x00);
mipi_dbi_command(dbi, DB7430_GAMMA_CTRL_REF, 0x50, 0x50);
mipi_dbi_command(dbi, DB7430_DCDC_CTRL, 0x2f, 0x11, 0x1e, 0x46);
mipi_dbi_command(dbi, DB7430_VCL_CTRL, 0x11, 0x0a);
return 0;
}
static int db7430_power_off(struct db7430 *db)
{
/* Go into RESET and disable regulators */
gpiod_set_value_cansleep(db->reset, 1);
return regulator_bulk_disable(ARRAY_SIZE(db->regulators),
db->regulators);
}
static int db7430_unprepare(struct drm_panel *panel)
{
return db7430_power_off(to_db7430(panel));
}
static int db7430_disable(struct drm_panel *panel)
{
struct db7430 *db = to_db7430(panel);
struct mipi_dbi *dbi = &db->dbi;
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
msleep(25);
mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
msleep(120);
return 0;
}
static int db7430_prepare(struct drm_panel *panel)
{
return db7430_power_on(to_db7430(panel));
}
static int db7430_enable(struct drm_panel *panel)
{
struct db7430 *db = to_db7430(panel);
struct mipi_dbi *dbi = &db->dbi;
/* Exit sleep mode */
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(20);
/* NVM (non-volatile memory) load sequence */
mipi_dbi_command(dbi, DB7430_UNKNOWN_D4, 0x52, 0x5e);
mipi_dbi_command(dbi, DB7430_UNKNOWN_F8, 0x01, 0xf5, 0xf2, 0x71, 0x44);
mipi_dbi_command(dbi, DB7430_UNKNOWN_FC, 0x00, 0x08);
msleep(150);
/* CABC turn on sequence (BC = backlight control) */
mipi_dbi_command(dbi, DB7430_UNKNOWN_B4, 0x0f, 0x00, 0x50);
mipi_dbi_command(dbi, DB7430_USER_SELECT, 0x80);
mipi_dbi_command(dbi, DB7430_UNKNOWN_B7, 0x24);
mipi_dbi_command(dbi, DB7430_UNKNOWN_B8, 0x01);
/* Turn on display */
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
return 0;
}
/**
* db7430_get_modes() - return the mode
* @panel: the panel to get the mode for
* @connector: reference to the central DRM connector control structure
*/
static int db7430_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct db7430 *db = to_db7430(panel);
struct drm_display_mode *mode;
static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
mode = drm_mode_duplicate(connector->dev, &db7430_480_800_mode);
if (!mode) {
dev_err(db->dev, "failed to add mode\n");
return -ENOMEM;
}
connector->display_info.bpc = 8;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
connector->display_info.bus_flags =
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
drm_display_info_set_bus_formats(&connector->display_info,
&bus_format, 1);
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
return 1;
}
static const struct drm_panel_funcs db7430_drm_funcs = {
.disable = db7430_disable,
.unprepare = db7430_unprepare,
.prepare = db7430_prepare,
.enable = db7430_enable,
.get_modes = db7430_get_modes,
};
static int db7430_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct db7430 *db;
int ret;
db = devm_kzalloc(dev, sizeof(*db), GFP_KERNEL);
if (!db)
return -ENOMEM;
db->dev = dev;
/*
* VCI is the analog voltage supply
* VCCIO is the digital I/O voltage supply
*/
db->regulators[0].supply = "vci";
db->regulators[1].supply = "vccio";
ret = devm_regulator_bulk_get(dev,
ARRAY_SIZE(db->regulators),
db->regulators);
if (ret)
return dev_err_probe(dev, ret, "failed to get regulators\n");
db->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(db->reset)) {
ret = PTR_ERR(db->reset);
return dev_err_probe(dev, ret, "no RESET GPIO\n");
}
ret = mipi_dbi_spi_init(spi, &db->dbi, NULL);
if (ret)
return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
drm_panel_init(&db->panel, dev, &db7430_drm_funcs,
DRM_MODE_CONNECTOR_DPI);
/* FIXME: if no external backlight, use internal backlight */
ret = drm_panel_of_backlight(&db->panel);
if (ret)
return dev_err_probe(dev, ret, "failed to add backlight\n");
spi_set_drvdata(spi, db);
drm_panel_add(&db->panel);
dev_dbg(dev, "added panel\n");
return 0;
}
static void db7430_remove(struct spi_device *spi)
{
struct db7430 *db = spi_get_drvdata(spi);
drm_panel_remove(&db->panel);
}
/*
* The DB7430 display controller may be used in several display products,
* so list the different variants here and add per-variant data if needed.
*/
static const struct of_device_id db7430_match[] = {
{ .compatible = "samsung,lms397kf04", },
{},
};
MODULE_DEVICE_TABLE(of, db7430_match);
static struct spi_driver db7430_driver = {
.probe = db7430_probe,
.remove = db7430_remove,
.driver = {
.name = "db7430-panel",
.of_match_table = db7430_match,
},
};
module_spi_driver(db7430_driver);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("Samsung DB7430 panel driver");
MODULE_LICENSE("GPL v2");
