1 // SPDX-License-Identifier: GPL-2.0
3  * Panel driver for the Samsung S6D27A1 480x800 DPI RGB panel.
4  * Found in the Samsung Galaxy Ace 2 GT-I8160 mobile phone.
15 #include <linux/media-bus-format.h>
19 #include <linux/spi/spi.h>
26 #define S6D27A1_READID1		0xDA	/* Read panel ID 1 */
27 #define S6D27A1_READID2		0xDB	/* Read panel ID 2 */
28 #define S6D27A1_READID3		0xDC	/* Read panel ID 3 */
33 #define S6D27A1_PANELCTL	0xF7	/* Panel Control*/
44 	struct mipi_dbi dbi;  member
45 	struct drm_panel panel;  member
52 	 * The vendor driver states that the S6D27A1 panel
69 static inline struct s6d27a1 *to_s6d27a1(struct drm_panel *panel)  in to_s6d27a1()  argument
71 	return container_of(panel, struct s6d27a1, panel);  in to_s6d27a1()
76 	struct mipi_dbi *dbi = &ctx->dbi;  in s6d27a1_read_mtp_id()  local
80 	ret = mipi_dbi_command_read(dbi, S6D27A1_READID1, &id1);  in s6d27a1_read_mtp_id()
82 		dev_err(ctx->dev, "unable to read MTP ID 1\n");  in s6d27a1_read_mtp_id()
85 	ret = mipi_dbi_command_read(dbi, S6D27A1_READID2, &id2);  in s6d27a1_read_mtp_id()
87 		dev_err(ctx->dev, "unable to read MTP ID 2\n");  in s6d27a1_read_mtp_id()
90 	ret = mipi_dbi_command_read(dbi, S6D27A1_READID3, &id3);  in s6d27a1_read_mtp_id()
92 		dev_err(ctx->dev, "unable to read MTP ID 3\n");  in s6d27a1_read_mtp_id()
95 	dev_info(ctx->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);  in s6d27a1_read_mtp_id()
100 	struct mipi_dbi *dbi = &ctx->dbi;  in s6d27a1_power_on()  local
104 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->regulators),  in s6d27a1_power_on()
105 				    ctx->regulators);  in s6d27a1_power_on()
107 		dev_err(ctx->dev, "failed to enable regulators: %d\n", ret);  in s6d27a1_power_on()
114 	gpiod_set_value_cansleep(ctx->reset, 1);  in s6d27a1_power_on()
116 	/* De-assert reset */  in s6d27a1_power_on()
117 	gpiod_set_value_cansleep(ctx->reset, 0);  in s6d27a1_power_on()
122 	 * Exit sleep mode and initialize display - some hammering is  in s6d27a1_power_on()
125 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);  in s6d27a1_power_on()
126 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);  in s6d27a1_power_on()
130 	mipi_dbi_command(dbi, S6D27A1_PASSWD_L2, 0x5A, 0x5A);  in s6d27a1_power_on()
133 	mipi_dbi_command(dbi, S6D27A1_RESCTL, 0x22);  in s6d27a1_power_on()
135 	mipi_dbi_command(dbi, S6D27A1_PANELCTL2, 0x00, 0x02, 0x03, 0x04, 0x05, 0x08, 0x00, 0x0c);  in s6d27a1_power_on()
137 	mipi_dbi_command(dbi, S6D27A1_MANPWR, 0x01, 0x00, 0x00, 0x08, 0x08, 0x02, 0x00);  in s6d27a1_power_on()
139 	mipi_dbi_command(dbi, S6D27A1_DISPCTL, 0x19, 0x00, 0x08, 0x0D, 0x03, 0x41, 0x3F);  in s6d27a1_power_on()
141 	mipi_dbi_command(dbi, S6D27A1_PWRCTL1, 0x00, 0x00, 0x00, 0x00, 0x55,  in s6d27a1_power_on()
144 	mipi_dbi_command(dbi, S6D27A1_SRCCTL, 0x03, 0x09, 0x8A, 0x00, 0x01, 0x16);  in s6d27a1_power_on()
146 	mipi_dbi_command(dbi, S6D27A1_PANELCTL, 0x00, 0x05, 0x06, 0x07, 0x08,  in s6d27a1_power_on()
156 	mipi_dbi_command(dbi, S6D27A1_PASSWD_L2, 0xA5, 0xA5);  in s6d27a1_power_on()
166 	gpiod_set_value_cansleep(ctx->reset, 1);  in s6d27a1_power_off()
167 	return regulator_bulk_disable(ARRAY_SIZE(ctx->regulators),  in s6d27a1_power_off()
168 				      ctx->regulators);  in s6d27a1_power_off()
171 static int s6d27a1_unprepare(struct drm_panel *panel)  in s6d27a1_unprepare()  argument
173 	struct s6d27a1 *ctx = to_s6d27a1(panel);  in s6d27a1_unprepare()
174 	struct mipi_dbi *dbi = &ctx->dbi;  in s6d27a1_unprepare()  local
176 	mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);  in s6d27a1_unprepare()
178 	return s6d27a1_power_off(to_s6d27a1(panel));  in s6d27a1_unprepare()
181 static int s6d27a1_disable(struct drm_panel *panel)  in s6d27a1_disable()  argument
183 	struct s6d27a1 *ctx = to_s6d27a1(panel);  in s6d27a1_disable()
184 	struct mipi_dbi *dbi = &ctx->dbi;  in s6d27a1_disable()  local
186 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);  in s6d27a1_disable()
192 static int s6d27a1_prepare(struct drm_panel *panel)  in s6d27a1_prepare()  argument
194 	return s6d27a1_power_on(to_s6d27a1(panel));  in s6d27a1_prepare()
197 static int s6d27a1_enable(struct drm_panel *panel)  in s6d27a1_enable()  argument
199 	struct s6d27a1 *ctx = to_s6d27a1(panel);  in s6d27a1_enable()
200 	struct mipi_dbi *dbi = &ctx->dbi;  in s6d27a1_enable()  local
202 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);  in s6d27a1_enable()
207 static int s6d27a1_get_modes(struct drm_panel *panel,  in s6d27a1_get_modes()  argument
210 	struct s6d27a1 *ctx = to_s6d27a1(panel);  in s6d27a1_get_modes()
214 	mode = drm_mode_duplicate(connector->dev, &s6d27a1_480_800_mode);  in s6d27a1_get_modes()
216 		dev_err(ctx->dev, "failed to add mode\n");  in s6d27a1_get_modes()
217 		return -ENOMEM;  in s6d27a1_get_modes()
220 	connector->display_info.bpc = 8;  in s6d27a1_get_modes()
221 	connector->display_info.width_mm = mode->width_mm;  in s6d27a1_get_modes()
222 	connector->display_info.height_mm = mode->height_mm;  in s6d27a1_get_modes()
223 	connector->display_info.bus_flags =  in s6d27a1_get_modes()
225 	drm_display_info_set_bus_formats(&connector->display_info,  in s6d27a1_get_modes()
229 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in s6d27a1_get_modes()
244 static int s6d27a1_probe(struct spi_device *spi)  in s6d27a1_probe()  argument
246 	struct device *dev = &spi->dev;  in s6d27a1_probe()
252 		return -ENOMEM;  in s6d27a1_probe()
254 	ctx->dev = dev;  in s6d27a1_probe()
260 	ctx->regulators[0].supply = "vci";  in s6d27a1_probe()
261 	ctx->regulators[1].supply = "vccio";  in s6d27a1_probe()
263 				      ARRAY_SIZE(ctx->regulators),  in s6d27a1_probe()
264 				      ctx->regulators);  in s6d27a1_probe()
268 	ctx->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in s6d27a1_probe()
269 	if (IS_ERR(ctx->reset)) {  in s6d27a1_probe()
270 		ret = PTR_ERR(ctx->reset);  in s6d27a1_probe()
274 	ret = mipi_dbi_spi_init(spi, &ctx->dbi, NULL);  in s6d27a1_probe()
276 		return dev_err_probe(dev, ret, "MIPI DBI init failed\n");  in s6d27a1_probe()
278 	ctx->dbi.read_commands = s6d27a1_dbi_read_commands;  in s6d27a1_probe()
280 	drm_panel_init(&ctx->panel, dev, &s6d27a1_drm_funcs,  in s6d27a1_probe()
283 	ret = drm_panel_of_backlight(&ctx->panel);  in s6d27a1_probe()
287 	spi_set_drvdata(spi, ctx);  in s6d27a1_probe()
289 	drm_panel_add(&ctx->panel);  in s6d27a1_probe()
294 static void s6d27a1_remove(struct spi_device *spi)  in s6d27a1_remove()  argument
296 	struct s6d27a1 *ctx = spi_get_drvdata(spi);  in s6d27a1_remove()
298 	drm_panel_remove(&ctx->panel);  in s6d27a1_remove()
311 		.name	= "s6d27a1-panel",
318 MODULE_DESCRIPTION("Samsung S6D27A1 panel driver");