1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (c) 2024 Linaro Limited
3
4 #include <linux/backlight.h>
5 #include <linux/delay.h>
6 #include <linux/gpio/consumer.h>
7 #include <linux/regulator/consumer.h>
8 #include <linux/mod_devicetable.h>
9 #include <linux/module.h>
10
11 #include <drm/display/drm_dsc.h>
12 #include <drm/display/drm_dsc_helper.h>
13 #include <drm/drm_mipi_dsi.h>
14 #include <drm/drm_modes.h>
15 #include <drm/drm_panel.h>
16 #include <drm/drm_probe_helper.h>
17
18 #include <video/mipi_display.h>
19
20 struct novatek_nt37801 {
21 struct drm_panel panel;
22 struct mipi_dsi_device *dsi;
23 struct drm_dsc_config dsc;
24 struct gpio_desc *reset_gpio;
25 struct regulator_bulk_data *supplies;
26 };
27
28 static const struct regulator_bulk_data novatek_nt37801_supplies[] = {
29 { .supply = "vddio" },
30 { .supply = "vci" },
31 { .supply = "vdd" },
32 };
33
to_novatek_nt37801(struct drm_panel * panel)34 static inline struct novatek_nt37801 *to_novatek_nt37801(struct drm_panel *panel)
35 {
36 return container_of(panel, struct novatek_nt37801, panel);
37 }
38
novatek_nt37801_reset(struct novatek_nt37801 * ctx)39 static void novatek_nt37801_reset(struct novatek_nt37801 *ctx)
40 {
41 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
42 usleep_range(10000, 21000);
43 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
44 usleep_range(10000, 21000);
45 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
46 usleep_range(10000, 21000);
47 }
48
49 #define NT37801_DCS_SWITCH_PAGE 0xf0
50
51 #define novatek_nt37801_switch_page(dsi_ctx, page) \
52 mipi_dsi_dcs_write_seq_multi((dsi_ctx), NT37801_DCS_SWITCH_PAGE, \
53 0x55, 0xaa, 0x52, 0x08, (page))
54
novatek_nt37801_on(struct novatek_nt37801 * ctx)55 static int novatek_nt37801_on(struct novatek_nt37801 *ctx)
56 {
57 struct mipi_dsi_device *dsi = ctx->dsi;
58 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
59
60 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
61
62 novatek_nt37801_switch_page(&dsi_ctx, 0x01);
63 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
64 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc5, 0x0b, 0x0b, 0x0b);
65 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x80);
66 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x02);
67 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf5, 0x10);
68 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x1b);
69 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf4, 0x55);
70 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x18);
71 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf8, 0x19);
72 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x0f);
73 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfc, 0x00);
74 mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 0x059f);
75 mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x0c7f);
76 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x90, 0x03, 0x03);
77 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x91,
78 0x89, 0x28, 0x00, 0x28, 0xc2, 0x00, 0x02,
79 0x68, 0x04, 0x6c, 0x00, 0x0a, 0x02, 0x77,
80 0x01, 0xe9, 0x10, 0xf0);
81 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x81);
82 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x23);
83 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfb,
84 0x00, 0x01, 0x00, 0x11, 0x33, 0x33, 0x33,
85 0x55, 0x57, 0xd0, 0x00, 0x00, 0x44, 0x56,
86 0x77, 0x78, 0x9a, 0xbc, 0xdd, 0xf0);
87 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x06);
88 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0xdc);
89 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_SET_GAMMA_CURVE, 0x00);
90 mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
91 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x00, 0x18, 0x00, 0x10);
92 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
93 0x20);
94 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51,
95 0x07, 0xff, 0x07, 0xff, 0x0f, 0xff);
96 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x01);
97 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x00);
98 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x9c, 0x01);
99 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_MEMORY_START);
100 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x00);
101
102 novatek_nt37801_switch_page(&dsi_ctx, 0x01);
103 mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb2, 0x55, 0x01, 0xff, 0x03);
104 mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
105 mipi_dsi_msleep(&dsi_ctx, 120);
106 mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
107 mipi_dsi_msleep(&dsi_ctx, 20);
108
109 return dsi_ctx.accum_err;
110 }
111
novatek_nt37801_off(struct novatek_nt37801 * ctx)112 static int novatek_nt37801_off(struct novatek_nt37801 *ctx)
113 {
114 struct mipi_dsi_device *dsi = ctx->dsi;
115 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
116
117 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
118
119 mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
120 mipi_dsi_msleep(&dsi_ctx, 20);
121
122 mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
123 mipi_dsi_msleep(&dsi_ctx, 120);
124
125 return dsi_ctx.accum_err;
126 }
127
novatek_nt37801_prepare(struct drm_panel * panel)128 static int novatek_nt37801_prepare(struct drm_panel *panel)
129 {
130 struct novatek_nt37801 *ctx = to_novatek_nt37801(panel);
131 struct device *dev = &ctx->dsi->dev;
132 struct drm_dsc_picture_parameter_set pps;
133 int ret;
134
135 ret = regulator_bulk_enable(ARRAY_SIZE(novatek_nt37801_supplies),
136 ctx->supplies);
137 if (ret < 0)
138 return ret;
139
140 novatek_nt37801_reset(ctx);
141
142 ret = novatek_nt37801_on(ctx);
143 if (ret < 0)
144 goto err;
145
146 drm_dsc_pps_payload_pack(&pps, &ctx->dsc);
147
148 ret = mipi_dsi_picture_parameter_set(ctx->dsi, &pps);
149 if (ret < 0) {
150 dev_err(panel->dev, "failed to transmit PPS: %d\n", ret);
151 goto err;
152 }
153
154 ret = mipi_dsi_compression_mode(ctx->dsi, true);
155 if (ret < 0) {
156 dev_err(dev, "failed to enable compression mode: %d\n", ret);
157 goto err;
158 }
159
160 msleep(28);
161
162 return 0;
163
164 err:
165 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
166 regulator_bulk_disable(ARRAY_SIZE(novatek_nt37801_supplies),
167 ctx->supplies);
168
169 return ret;
170 }
171
novatek_nt37801_unprepare(struct drm_panel * panel)172 static int novatek_nt37801_unprepare(struct drm_panel *panel)
173 {
174 struct novatek_nt37801 *ctx = to_novatek_nt37801(panel);
175 struct device *dev = &ctx->dsi->dev;
176 int ret;
177
178 ret = novatek_nt37801_off(ctx);
179 if (ret < 0)
180 dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
181
182 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
183
184 regulator_bulk_disable(ARRAY_SIZE(novatek_nt37801_supplies),
185 ctx->supplies);
186
187 return 0;
188 }
189
190 static const struct drm_display_mode novatek_nt37801_mode = {
191 .clock = (1440 + 20 + 4 + 20) * (3200 + 20 + 2 + 18) * 120 / 1000,
192 .hdisplay = 1440,
193 .hsync_start = 1440 + 20,
194 .hsync_end = 1440 + 20 + 4,
195 .htotal = 1440 + 20 + 4 + 20,
196 .vdisplay = 3200,
197 .vsync_start = 3200 + 20,
198 .vsync_end = 3200 + 20 + 2,
199 .vtotal = 3200 + 20 + 2 + 18,
200 .type = DRM_MODE_TYPE_DRIVER,
201 };
202
novatek_nt37801_get_modes(struct drm_panel * panel,struct drm_connector * connector)203 static int novatek_nt37801_get_modes(struct drm_panel *panel,
204 struct drm_connector *connector)
205 {
206 return drm_connector_helper_get_modes_fixed(connector,
207 &novatek_nt37801_mode);
208 }
209
210 static const struct drm_panel_funcs novatek_nt37801_panel_funcs = {
211 .prepare = novatek_nt37801_prepare,
212 .unprepare = novatek_nt37801_unprepare,
213 .get_modes = novatek_nt37801_get_modes,
214 };
215
novatek_nt37801_bl_update_status(struct backlight_device * bl)216 static int novatek_nt37801_bl_update_status(struct backlight_device *bl)
217 {
218 struct mipi_dsi_device *dsi = bl_get_data(bl);
219 u16 brightness = backlight_get_brightness(bl);
220 int ret;
221
222 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
223
224 ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
225 if (ret < 0)
226 return ret;
227
228 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
229
230 return 0;
231 }
232
233 static const struct backlight_ops novatek_nt37801_bl_ops = {
234 .update_status = novatek_nt37801_bl_update_status,
235 };
236
237 static struct backlight_device *
novatek_nt37801_create_backlight(struct mipi_dsi_device * dsi)238 novatek_nt37801_create_backlight(struct mipi_dsi_device *dsi)
239 {
240 struct device *dev = &dsi->dev;
241 const struct backlight_properties props = {
242 .type = BACKLIGHT_RAW,
243 .brightness = 4095,
244 .max_brightness = 4095,
245 };
246
247 return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
248 &novatek_nt37801_bl_ops, &props);
249 }
250
novatek_nt37801_probe(struct mipi_dsi_device * dsi)251 static int novatek_nt37801_probe(struct mipi_dsi_device *dsi)
252 {
253 struct device *dev = &dsi->dev;
254 struct novatek_nt37801 *ctx;
255 int ret;
256
257 ctx = devm_drm_panel_alloc(dev, struct novatek_nt37801, panel,
258 &novatek_nt37801_panel_funcs,
259 DRM_MODE_CONNECTOR_DSI);
260 if (IS_ERR(ctx))
261 return PTR_ERR(ctx);
262
263 ret = devm_regulator_bulk_get_const(dev,
264 ARRAY_SIZE(novatek_nt37801_supplies),
265 novatek_nt37801_supplies,
266 &ctx->supplies);
267 if (ret < 0)
268 return ret;
269
270 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
271 if (IS_ERR(ctx->reset_gpio))
272 return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
273 "Failed to get reset-gpios\n");
274
275 ctx->dsi = dsi;
276 mipi_dsi_set_drvdata(dsi, ctx);
277
278 dsi->lanes = 4;
279 dsi->format = MIPI_DSI_FMT_RGB888;
280 dsi->mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_CLOCK_NON_CONTINUOUS;
281
282 ctx->panel.prepare_prev_first = true;
283 ctx->panel.backlight = novatek_nt37801_create_backlight(dsi);
284 if (IS_ERR(ctx->panel.backlight))
285 return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
286 "Failed to create backlight\n");
287
288 drm_panel_add(&ctx->panel);
289
290 /* This panel only supports DSC; unconditionally enable it */
291 dsi->dsc = &ctx->dsc;
292 ctx->dsc.dsc_version_major = 1;
293 ctx->dsc.dsc_version_minor = 1;
294 ctx->dsc.slice_height = 40;
295 ctx->dsc.slice_width = 720;
296 ctx->dsc.slice_count = 1440 / ctx->dsc.slice_width;
297 ctx->dsc.bits_per_component = 8;
298 ctx->dsc.bits_per_pixel = 8 << 4; /* 4 fractional bits */
299 ctx->dsc.block_pred_enable = true;
300
301 ret = mipi_dsi_attach(dsi);
302 if (ret < 0) {
303 drm_panel_remove(&ctx->panel);
304 return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
305 }
306
307 return 0;
308 }
309
novatek_nt37801_remove(struct mipi_dsi_device * dsi)310 static void novatek_nt37801_remove(struct mipi_dsi_device *dsi)
311 {
312 struct novatek_nt37801 *ctx = mipi_dsi_get_drvdata(dsi);
313 int ret;
314
315 ret = mipi_dsi_detach(dsi);
316 if (ret < 0)
317 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
318
319 drm_panel_remove(&ctx->panel);
320 }
321
322 static const struct of_device_id novatek_nt37801_of_match[] = {
323 { .compatible = "novatek,nt37801" },
324 {}
325 };
326 MODULE_DEVICE_TABLE(of, novatek_nt37801_of_match);
327
328 static struct mipi_dsi_driver novatek_nt37801_driver = {
329 .probe = novatek_nt37801_probe,
330 .remove = novatek_nt37801_remove,
331 .driver = {
332 .name = "panel-novatek-nt37801",
333 .of_match_table = novatek_nt37801_of_match,
334 },
335 };
336 module_mipi_dsi_driver(novatek_nt37801_driver);
337
338 MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>");
339 MODULE_DESCRIPTION("Panel driver for the Novatek NT37801/NT37810 AMOLED DSI panel");
340 MODULE_LICENSE("GPL");
341