--- /dev/null
+// 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 int db7430_remove(struct spi_device *spi)
+{
+ struct db7430 *db = spi_get_drvdata(spi);
+
+ drm_panel_remove(&db->panel);
+ return 0;
+}
+
+/*
+ * 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");
projects / platform / kernel / linux-starfive.git / commitdiff