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 
31 #define dsi_dcs_write_seq(dsi, seq...) do {				\
32 		static const u8 d[] = { seq };				\
33 		int ret;						\
34 		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
35 		if (ret < 0)						\
36 			return ret;					\
37 	} while (0)
38 
s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 * ctx)39 static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
40 {
41 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
42 	usleep_range(5000, 6000);
43 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
44 	usleep_range(1000, 2000);
45 	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
46 	usleep_range(10000, 11000);
47 }
48 
s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 * ctx)49 static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
50 {
51 	struct mipi_dsi_device *dsi = ctx->dsi;
52 	struct device *dev = &dsi->dev;
53 	int ret;
54 
55 	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
56 
57 	dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
58 	dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
59 
60 	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
61 	if (ret < 0) {
62 		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
63 		return ret;
64 	}
65 	msleep(120);
66 
67 	// set default brightness/gama
68 	dsi_dcs_write_seq(dsi, 0xca,
69 			  0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
70 			  0x80, 0x80, 0x80,			// V203 R,G,B
71 			  0x80, 0x80, 0x80,			// V151 R,G,B
72 			  0x80, 0x80, 0x80,			// V87  R,G,B
73 			  0x80, 0x80, 0x80,			// V51  R,G,B
74 			  0x80, 0x80, 0x80,			// V35  R,G,B
75 			  0x80, 0x80, 0x80,			// V23  R,G,B
76 			  0x80, 0x80, 0x80,			// V11  R,G,B
77 			  0x6b, 0x68, 0x71,			// V3   R,G,B
78 			  0x00, 0x00, 0x00);			// V1   R,G,B
79 	// set default Amoled Off Ratio
80 	dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);
81 	dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
82 	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
83 	dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
84 	dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
85 
86 	ret = mipi_dsi_dcs_set_display_on(dsi);
87 	if (ret < 0) {
88 		dev_err(dev, "Failed to set display on: %d\n", ret);
89 		return ret;
90 	}
91 
92 	return 0;
93 }
94 
s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 * ctx)95 static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
96 {
97 	struct mipi_dsi_device *dsi = ctx->dsi;
98 	struct device *dev = &dsi->dev;
99 	int ret;
100 
101 	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
102 
103 	ret = mipi_dsi_dcs_set_display_off(dsi);
104 	if (ret < 0) {
105 		dev_err(dev, "Failed to set display off: %d\n", ret);
106 		return ret;
107 	}
108 	msleep(35);
109 
110 	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
111 	if (ret < 0) {
112 		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
113 		return ret;
114 	}
115 	msleep(120);
116 
117 	return 0;
118 }
119 
s6e88a0_ams452ef01_prepare(struct drm_panel * panel)120 static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
121 {
122 	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
123 	struct device *dev = &ctx->dsi->dev;
124 	int ret;
125 
126 	if (ctx->prepared)
127 		return 0;
128 
129 	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
130 	if (ret < 0) {
131 		dev_err(dev, "Failed to enable regulators: %d\n", ret);
132 		return ret;
133 	}
134 
135 	s6e88a0_ams452ef01_reset(ctx);
136 
137 	ret = s6e88a0_ams452ef01_on(ctx);
138 	if (ret < 0) {
139 		dev_err(dev, "Failed to initialize panel: %d\n", ret);
140 		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
141 		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
142 				       ctx->supplies);
143 		return ret;
144 	}
145 
146 	ctx->prepared = true;
147 	return 0;
148 }
149 
s6e88a0_ams452ef01_unprepare(struct drm_panel * panel)150 static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
151 {
152 	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
153 	struct device *dev = &ctx->dsi->dev;
154 	int ret;
155 
156 	if (!ctx->prepared)
157 		return 0;
158 
159 	ret = s6e88a0_ams452ef01_off(ctx);
160 	if (ret < 0)
161 		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
162 
163 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
164 	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
165 
166 	ctx->prepared = false;
167 	return 0;
168 }
169 
170 static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
171 	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
172 	.hdisplay = 540,
173 	.hsync_start = 540 + 88,
174 	.hsync_end = 540 + 88 + 4,
175 	.htotal = 540 + 88 + 4 + 20,
176 	.vdisplay = 960,
177 	.vsync_start = 960 + 14,
178 	.vsync_end = 960 + 14 + 2,
179 	.vtotal = 960 + 14 + 2 + 8,
180 	.width_mm = 56,
181 	.height_mm = 100,
182 };
183 
s6e88a0_ams452ef01_get_modes(struct drm_panel * panel,struct drm_connector * connector)184 static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
185 					struct drm_connector *connector)
186 {
187 	struct drm_display_mode *mode;
188 
189 	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
190 	if (!mode)
191 		return -ENOMEM;
192 
193 	drm_mode_set_name(mode);
194 
195 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
196 	connector->display_info.width_mm = mode->width_mm;
197 	connector->display_info.height_mm = mode->height_mm;
198 	drm_mode_probed_add(connector, mode);
199 
200 	return 1;
201 }
202 
203 static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
204 	.unprepare = s6e88a0_ams452ef01_unprepare,
205 	.prepare = s6e88a0_ams452ef01_prepare,
206 	.get_modes = s6e88a0_ams452ef01_get_modes,
207 };
208 
s6e88a0_ams452ef01_probe(struct mipi_dsi_device * dsi)209 static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
210 {
211 	struct device *dev = &dsi->dev;
212 	struct s6e88a0_ams452ef01 *ctx;
213 	int ret;
214 
215 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
216 	if (!ctx)
217 		return -ENOMEM;
218 
219 	ctx->supplies[0].supply = "vdd3";
220 	ctx->supplies[1].supply = "vci";
221 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
222 				      ctx->supplies);
223 	if (ret < 0) {
224 		dev_err(dev, "Failed to get regulators: %d\n", ret);
225 		return ret;
226 	}
227 
228 	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
229 	if (IS_ERR(ctx->reset_gpio)) {
230 		ret = PTR_ERR(ctx->reset_gpio);
231 		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
232 		return ret;
233 	}
234 
235 	ctx->dsi = dsi;
236 	mipi_dsi_set_drvdata(dsi, ctx);
237 
238 	dsi->lanes = 2;
239 	dsi->format = MIPI_DSI_FMT_RGB888;
240 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
241 
242 	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
243 		       DRM_MODE_CONNECTOR_DSI);
244 
245 	drm_panel_add(&ctx->panel);
246 
247 	ret = mipi_dsi_attach(dsi);
248 	if (ret < 0) {
249 		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
250 		return ret;
251 	}
252 
253 	return 0;
254 }
255 
s6e88a0_ams452ef01_remove(struct mipi_dsi_device * dsi)256 static int s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
257 {
258 	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
259 	int ret;
260 
261 	ret = mipi_dsi_detach(dsi);
262 	if (ret < 0)
263 		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
264 
265 	drm_panel_remove(&ctx->panel);
266 
267 	return 0;
268 }
269 
270 static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
271 	{ .compatible = "samsung,s6e88a0-ams452ef01" },
272 	{ /* sentinel */ },
273 };
274 MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
275 
276 static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
277 	.probe = s6e88a0_ams452ef01_probe,
278 	.remove = s6e88a0_ams452ef01_remove,
279 	.driver = {
280 		.name = "panel-s6e88a0-ams452ef01",
281 		.of_match_table = s6e88a0_ams452ef01_of_match,
282 	},
283 };
284 module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
285 
286 MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
287 MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
288 MODULE_LICENSE("GPL v2");
289