1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (C) 2019, Michael Srba
3 
4 #include <linux/delay.h>
5 #include <linux/gpio/consumer.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/regulator/consumer.h>
9 
10 #include <video/mipi_display.h>
11 
12 #include <drm/drm_mipi_dsi.h>
13 #include <drm/drm_modes.h>
14 #include <drm/drm_panel.h>
15 
16 struct s6e88a0_ams452ef01 {
17 	struct drm_panel panel;
18 	struct mipi_dsi_device *dsi;
19 	struct regulator_bulk_data supplies[2];
20 	struct gpio_desc *reset_gpio;
21 
22 	bool prepared;
23 };
24 
25 static inline struct
to_s6e88a0_ams452ef01(struct drm_panel * panel)26 s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
27 {
28 	return container_of(panel, struct s6e88a0_ams452ef01, panel);
29 }
30 
s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 * ctx)31 static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
32 {
33 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
34 	usleep_range(5000, 6000);
35 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
36 	usleep_range(1000, 2000);
37 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
38 	usleep_range(10000, 11000);
39 }
40 
s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 * ctx)41 static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
42 {
43 	struct mipi_dsi_device *dsi = ctx->dsi;
44 	struct device *dev = &dsi->dev;
45 	int ret;
46 
47 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
48 
49 	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
50 	mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
51 
52 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
53 	if (ret < 0) {
54 		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
55 		return ret;
56 	}
57 	msleep(120);
58 
59 	// set default brightness/gama
60 	mipi_dsi_dcs_write_seq(dsi, 0xca,
61 			       0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
62 			       0x80, 0x80, 0x80,			// V203 R,G,B
63 			       0x80, 0x80, 0x80,			// V151 R,G,B
64 			       0x80, 0x80, 0x80,			// V87  R,G,B
65 			       0x80, 0x80, 0x80,			// V51  R,G,B
66 			       0x80, 0x80, 0x80,			// V35  R,G,B
67 			       0x80, 0x80, 0x80,			// V23  R,G,B
68 			       0x80, 0x80, 0x80,			// V11  R,G,B
69 			       0x6b, 0x68, 0x71,			// V3   R,G,B
70 			       0x00, 0x00, 0x00);			// V1   R,G,B
71 	// set default Amoled Off Ratio
72 	mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
73 	mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
74 	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
75 	mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
76 	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
77 
78 	ret = mipi_dsi_dcs_set_display_on(dsi);
79 	if (ret < 0) {
80 		dev_err(dev, "Failed to set display on: %d\n", ret);
81 		return ret;
82 	}
83 
84 	return 0;
85 }
86 
s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 * ctx)87 static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
88 {
89 	struct mipi_dsi_device *dsi = ctx->dsi;
90 	struct device *dev = &dsi->dev;
91 	int ret;
92 
93 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
94 
95 	ret = mipi_dsi_dcs_set_display_off(dsi);
96 	if (ret < 0) {
97 		dev_err(dev, "Failed to set display off: %d\n", ret);
98 		return ret;
99 	}
100 	msleep(35);
101 
102 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
103 	if (ret < 0) {
104 		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
105 		return ret;
106 	}
107 	msleep(120);
108 
109 	return 0;
110 }
111 
s6e88a0_ams452ef01_prepare(struct drm_panel * panel)112 static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
113 {
114 	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
115 	struct device *dev = &ctx->dsi->dev;
116 	int ret;
117 
118 	if (ctx->prepared)
119 		return 0;
120 
121 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
122 	if (ret < 0) {
123 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
124 		return ret;
125 	}
126 
127 	s6e88a0_ams452ef01_reset(ctx);
128 
129 	ret = s6e88a0_ams452ef01_on(ctx);
130 	if (ret < 0) {
131 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
132 		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
133 		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
134 				       ctx->supplies);
135 		return ret;
136 	}
137 
138 	ctx->prepared = true;
139 	return 0;
140 }
141 
s6e88a0_ams452ef01_unprepare(struct drm_panel * panel)142 static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
143 {
144 	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
145 	struct device *dev = &ctx->dsi->dev;
146 	int ret;
147 
148 	if (!ctx->prepared)
149 		return 0;
150 
151 	ret = s6e88a0_ams452ef01_off(ctx);
152 	if (ret < 0)
153 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
154 
155 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
156 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
157 
158 	ctx->prepared = false;
159 	return 0;
160 }
161 
162 static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
163 	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
164 	.hdisplay = 540,
165 	.hsync_start = 540 + 88,
166 	.hsync_end = 540 + 88 + 4,
167 	.htotal = 540 + 88 + 4 + 20,
168 	.vdisplay = 960,
169 	.vsync_start = 960 + 14,
170 	.vsync_end = 960 + 14 + 2,
171 	.vtotal = 960 + 14 + 2 + 8,
172 	.width_mm = 56,
173 	.height_mm = 100,
174 };
175 
s6e88a0_ams452ef01_get_modes(struct drm_panel * panel,struct drm_connector * connector)176 static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
177 					struct drm_connector *connector)
178 {
179 	struct drm_display_mode *mode;
180 
181 	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
182 	if (!mode)
183 		return -ENOMEM;
184 
185 	drm_mode_set_name(mode);
186 
187 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
188 	connector->display_info.width_mm = mode->width_mm;
189 	connector->display_info.height_mm = mode->height_mm;
190 	drm_mode_probed_add(connector, mode);
191 
192 	return 1;
193 }
194 
195 static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
196 	.unprepare = s6e88a0_ams452ef01_unprepare,
197 	.prepare = s6e88a0_ams452ef01_prepare,
198 	.get_modes = s6e88a0_ams452ef01_get_modes,
199 };
200 
s6e88a0_ams452ef01_probe(struct mipi_dsi_device * dsi)201 static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
202 {
203 	struct device *dev = &dsi->dev;
204 	struct s6e88a0_ams452ef01 *ctx;
205 	int ret;
206 
207 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
208 	if (!ctx)
209 		return -ENOMEM;
210 
211 	ctx->supplies[0].supply = "vdd3";
212 	ctx->supplies[1].supply = "vci";
213 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
214 				      ctx->supplies);
215 	if (ret < 0) {
216 		dev_err(dev, "Failed to get regulators: %d\n", ret);
217 		return ret;
218 	}
219 
220 	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
221 	if (IS_ERR(ctx->reset_gpio)) {
222 		ret = PTR_ERR(ctx->reset_gpio);
223 		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
224 		return ret;
225 	}
226 
227 	ctx->dsi = dsi;
228 	mipi_dsi_set_drvdata(dsi, ctx);
229 
230 	dsi->lanes = 2;
231 	dsi->format = MIPI_DSI_FMT_RGB888;
232 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
233 
234 	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
235 		       DRM_MODE_CONNECTOR_DSI);
236 
237 	drm_panel_add(&ctx->panel);
238 
239 	ret = mipi_dsi_attach(dsi);
240 	if (ret < 0) {
241 		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
242 		drm_panel_remove(&ctx->panel);
243 		return ret;
244 	}
245 
246 	return 0;
247 }
248 
s6e88a0_ams452ef01_remove(struct mipi_dsi_device * dsi)249 static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
250 {
251 	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
252 	int ret;
253 
254 	ret = mipi_dsi_detach(dsi);
255 	if (ret < 0)
256 		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
257 
258 	drm_panel_remove(&ctx->panel);
259 }
260 
261 static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
262 	{ .compatible = "samsung,s6e88a0-ams452ef01" },
263 	{ /* sentinel */ },
264 };
265 MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
266 
267 static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
268 	.probe = s6e88a0_ams452ef01_probe,
269 	.remove = s6e88a0_ams452ef01_remove,
270 	.driver = {
271 		.name = "panel-s6e88a0-ams452ef01",
272 		.of_match_table = s6e88a0_ams452ef01_of_match,
273 	},
274 };
275 module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
276 
277 MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
278 MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
279 MODULE_LICENSE("GPL v2");
280