1 // SPDX-License-Identifier: GPL-2.0
3  * Panel driver for the Samsung LMS397KF04 480x800 DPI RGB panel.
5  * Found in the Samsung Galaxy Beam GT-I8350 mobile phone.
16 #include <linux/media-bus-format.h>
20 #include <linux/spi/spi.h>
49  * struct db7430 - state container for a panel controlled by the DB7430
55 	/** @dbi: the DBI bus abstraction handle */
56 	struct mipi_dbi dbi;  member
57 	/** @panel: the DRM panel instance for this device */
58 	struct drm_panel panel;  member
59 	/** @width: the width of this panel in mm */
61 	/** @height: the height of this panel in mm */
88 static inline struct db7430 *to_db7430(struct drm_panel *panel)  in to_db7430()  argument
90 	return container_of(panel, struct db7430, panel);  in to_db7430()
95 	struct mipi_dbi *dbi = &db->dbi;  in db7430_power_on()  local
99 	ret = regulator_bulk_enable(ARRAY_SIZE(db->regulators),  in db7430_power_on()
100 				    db->regulators);  in db7430_power_on()
102 		dev_err(db->dev, "failed to enable regulators: %d\n", ret);  in db7430_power_on()
108 	gpiod_set_value_cansleep(db->reset, 1);  in db7430_power_on()
110 	/* De-assert reset */  in db7430_power_on()
111 	gpiod_set_value_cansleep(db->reset, 0);  in db7430_power_on()
114 	dev_dbg(db->dev, "de-asserted RESET\n");  in db7430_power_on()
122 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);  in db7430_power_on()
123 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);  in db7430_power_on()
124 	mipi_dbi_command(dbi, DB7430_ACCESS_PROT_OFF, 0x00);  in db7430_power_on()
125 	mipi_dbi_command(dbi, DB7430_PANEL_DRIVING, 0x28, 0x08);  in db7430_power_on()
126 	mipi_dbi_command(dbi, DB7430_SOURCE_CONTROL,  in db7430_power_on()
128 	mipi_dbi_command(dbi, DB7430_GATE_INTERFACE,  in db7430_power_on()
130 	mipi_dbi_command(dbi, DB7430_DISPLAY_H_TIMING,  in db7430_power_on()
137 	mipi_dbi_command(dbi, DB7430_RGB_SYNC_OPTION, 0x01);  in db7430_power_on()
138 	mipi_dbi_command(dbi, DB7430_GAMMA_SET_RED,  in db7430_power_on()
145 	mipi_dbi_command(dbi, DB7430_GAMMA_SET_GREEN,  in db7430_power_on()
152 	mipi_dbi_command(dbi, DB7430_GAMMA_SET_BLUE,  in db7430_power_on()
159 	mipi_dbi_command(dbi, DB7430_BIAS_CURRENT_CTRL, 0x33, 0x13);  in db7430_power_on()
160 	mipi_dbi_command(dbi, DB7430_DDV_CTRL, 0x11, 0x00, 0x00);  in db7430_power_on()
161 	mipi_dbi_command(dbi, DB7430_GAMMA_CTRL_REF, 0x50, 0x50);  in db7430_power_on()
162 	mipi_dbi_command(dbi, DB7430_DCDC_CTRL, 0x2f, 0x11, 0x1e, 0x46);  in db7430_power_on()
163 	mipi_dbi_command(dbi, DB7430_VCL_CTRL, 0x11, 0x0a);  in db7430_power_on()
171 	gpiod_set_value_cansleep(db->reset, 1);  in db7430_power_off()
172 	return regulator_bulk_disable(ARRAY_SIZE(db->regulators),  in db7430_power_off()
173 				      db->regulators);  in db7430_power_off()
176 static int db7430_unprepare(struct drm_panel *panel)  in db7430_unprepare()  argument
178 	return db7430_power_off(to_db7430(panel));  in db7430_unprepare()
181 static int db7430_disable(struct drm_panel *panel)  in db7430_disable()  argument
183 	struct db7430 *db = to_db7430(panel);  in db7430_disable()
184 	struct mipi_dbi *dbi = &db->dbi;  in db7430_disable()  local
186 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);  in db7430_disable()
188 	mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);  in db7430_disable()
194 static int db7430_prepare(struct drm_panel *panel)  in db7430_prepare()  argument
196 	return db7430_power_on(to_db7430(panel));  in db7430_prepare()
199 static int db7430_enable(struct drm_panel *panel)  in db7430_enable()  argument
201 	struct db7430 *db = to_db7430(panel);  in db7430_enable()
202 	struct mipi_dbi *dbi = &db->dbi;  in db7430_enable()  local
205 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);  in db7430_enable()
208 	/* NVM (non-volatile memory) load sequence */  in db7430_enable()
209 	mipi_dbi_command(dbi, DB7430_UNKNOWN_D4, 0x52, 0x5e);  in db7430_enable()
210 	mipi_dbi_command(dbi, DB7430_UNKNOWN_F8, 0x01, 0xf5, 0xf2, 0x71, 0x44);  in db7430_enable()
211 	mipi_dbi_command(dbi, DB7430_UNKNOWN_FC, 0x00, 0x08);  in db7430_enable()
215 	mipi_dbi_command(dbi, DB7430_UNKNOWN_B4, 0x0f, 0x00, 0x50);  in db7430_enable()
216 	mipi_dbi_command(dbi, DB7430_USER_SELECT, 0x80);  in db7430_enable()
217 	mipi_dbi_command(dbi, DB7430_UNKNOWN_B7, 0x24);  in db7430_enable()
218 	mipi_dbi_command(dbi, DB7430_UNKNOWN_B8, 0x01);  in db7430_enable()
221 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);  in db7430_enable()
227  * db7430_get_modes() - return the mode
228  * @panel: the panel to get the mode for
231 static int db7430_get_modes(struct drm_panel *panel,  in db7430_get_modes()  argument
234 	struct db7430 *db = to_db7430(panel);  in db7430_get_modes()
238 	mode = drm_mode_duplicate(connector->dev, &db7430_480_800_mode);  in db7430_get_modes()
240 		dev_err(db->dev, "failed to add mode\n");  in db7430_get_modes()
241 		return -ENOMEM;  in db7430_get_modes()
244 	connector->display_info.bpc = 8;  in db7430_get_modes()
245 	connector->display_info.width_mm = mode->width_mm;  in db7430_get_modes()
246 	connector->display_info.height_mm = mode->height_mm;  in db7430_get_modes()
247 	connector->display_info.bus_flags =  in db7430_get_modes()
249 	drm_display_info_set_bus_formats(&connector->display_info,  in db7430_get_modes()
253 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in db7430_get_modes()
268 static int db7430_probe(struct spi_device *spi)  in db7430_probe()  argument
270 	struct device *dev = &spi->dev;  in db7430_probe()
276 		return -ENOMEM;  in db7430_probe()
277 	db->dev = dev;  in db7430_probe()
283 	db->regulators[0].supply = "vci";  in db7430_probe()
284 	db->regulators[1].supply = "vccio";  in db7430_probe()
286 				      ARRAY_SIZE(db->regulators),  in db7430_probe()
287 				      db->regulators);  in db7430_probe()
291 	db->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in db7430_probe()
292 	if (IS_ERR(db->reset)) {  in db7430_probe()
293 		ret = PTR_ERR(db->reset);  in db7430_probe()
297 	ret = mipi_dbi_spi_init(spi, &db->dbi, NULL);  in db7430_probe()
299 		return dev_err_probe(dev, ret, "MIPI DBI init failed\n");  in db7430_probe()
301 	drm_panel_init(&db->panel, dev, &db7430_drm_funcs,  in db7430_probe()
305 	ret = drm_panel_of_backlight(&db->panel);  in db7430_probe()
309 	spi_set_drvdata(spi, db);  in db7430_probe()
311 	drm_panel_add(&db->panel);  in db7430_probe()
312 	dev_dbg(dev, "added panel\n");  in db7430_probe()
317 static void db7430_remove(struct spi_device *spi)  in db7430_remove()  argument
319 	struct db7430 *db = spi_get_drvdata(spi);  in db7430_remove()
321 	drm_panel_remove(&db->panel);  in db7430_remove()
326  * so list the different variants here and add per-variant data if needed.
338 		.name	= "db7430-panel",
345 MODULE_DESCRIPTION("Samsung DB7430 panel driver");