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Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Elida kd35t133 3.5" MIPI-DSI panel driver
4 * Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH
5 *
6 * based on
7 *
8 * Rockteck jh057n00900 5.5" MIPI-DSI panel driver
9 * Copyright (C) Purism SPC 2019
10 */
11
12#include <linux/delay.h>
13#include <linux/gpio/consumer.h>
14#include <linux/media-bus-format.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/regulator/consumer.h>
18
19#include <video/display_timing.h>
20#include <video/mipi_display.h>
21
22#include <drm/drm_mipi_dsi.h>
23#include <drm/drm_modes.h>
24#include <drm/drm_panel.h>
25
26/* Manufacturer specific Commands send via DSI */
27#define KD35T133_CMD_INTERFACEMODECTRL 0xb0
28#define KD35T133_CMD_FRAMERATECTRL 0xb1
29#define KD35T133_CMD_DISPLAYINVERSIONCTRL 0xb4
30#define KD35T133_CMD_DISPLAYFUNCTIONCTRL 0xb6
31#define KD35T133_CMD_POWERCONTROL1 0xc0
32#define KD35T133_CMD_POWERCONTROL2 0xc1
33#define KD35T133_CMD_VCOMCONTROL 0xc5
34#define KD35T133_CMD_POSITIVEGAMMA 0xe0
35#define KD35T133_CMD_NEGATIVEGAMMA 0xe1
36#define KD35T133_CMD_SETIMAGEFUNCTION 0xe9
37#define KD35T133_CMD_ADJUSTCONTROL3 0xf7
38
39struct kd35t133 {
40 struct device *dev;
41 struct drm_panel panel;
42 struct gpio_desc *reset_gpio;
43 struct regulator *vdd;
44 struct regulator *iovcc;
45 enum drm_panel_orientation orientation;
46};
47
48static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
49{
50 return container_of(panel, struct kd35t133, panel);
51}
52
53static void kd35t133_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
54{
55 /*
56 * Init sequence was supplied by the panel vendor with minimal
57 * documentation.
58 */
59 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POSITIVEGAMMA,
60 0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
61 0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
62 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_NEGATIVEGAMMA,
63 0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
64 0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
65 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
66 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL2, 0x41);
67 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
68 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
69 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
70 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
71 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_FRAMERATECTRL, 0xa0);
72 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
73 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
74 0x20, 0x02);
75 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
76 mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_ADJUSTCONTROL3,
77 0xa9, 0x51, 0x2c, 0x82);
78 mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_ENTER_INVERT_MODE);
79}
80
81static int kd35t133_unprepare(struct drm_panel *panel)
82{
83 struct kd35t133 *ctx = panel_to_kd35t133(panel);
84 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
85 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
86
87 mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
88 mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
89 if (dsi_ctx.accum_err)
90 return dsi_ctx.accum_err;
91
92 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
93
94 regulator_disable(ctx->iovcc);
95 regulator_disable(ctx->vdd);
96
97 return 0;
98}
99
100static int kd35t133_prepare(struct drm_panel *panel)
101{
102 struct kd35t133 *ctx = panel_to_kd35t133(panel);
103 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
104 struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
105
106 dev_dbg(ctx->dev, "Resetting the panel\n");
107 dsi_ctx.accum_err = regulator_enable(ctx->vdd);
108 if (dsi_ctx.accum_err) {
109 dev_err(ctx->dev, "Failed to enable vdd supply: %d\n",
110 dsi_ctx.accum_err);
111 return dsi_ctx.accum_err;
112 }
113
114 dsi_ctx.accum_err = regulator_enable(ctx->iovcc);
115 if (dsi_ctx.accum_err) {
116 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n",
117 dsi_ctx.accum_err);
118 goto disable_vdd;
119 }
120
121 msleep(20);
122
123 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
124 usleep_range(10, 20);
125 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
126
127 msleep(20);
128
129 mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
130 mipi_dsi_msleep(&dsi_ctx, 250);
131
132 kd35t133_init_sequence(&dsi_ctx);
133 if (!dsi_ctx.accum_err)
134 dev_dbg(ctx->dev, "Panel init sequence done\n");
135
136 mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
137 mipi_dsi_msleep(&dsi_ctx, 50);
138
139 if (dsi_ctx.accum_err)
140 goto disable_iovcc;
141
142 return 0;
143
144disable_iovcc:
145 regulator_disable(ctx->iovcc);
146disable_vdd:
147 regulator_disable(ctx->vdd);
148 return dsi_ctx.accum_err;
149}
150
151static const struct drm_display_mode default_mode = {
152 .hdisplay = 320,
153 .hsync_start = 320 + 130,
154 .hsync_end = 320 + 130 + 4,
155 .htotal = 320 + 130 + 4 + 130,
156 .vdisplay = 480,
157 .vsync_start = 480 + 2,
158 .vsync_end = 480 + 2 + 1,
159 .vtotal = 480 + 2 + 1 + 2,
160 .clock = 17000,
161 .width_mm = 42,
162 .height_mm = 82,
163};
164
165static int kd35t133_get_modes(struct drm_panel *panel,
166 struct drm_connector *connector)
167{
168 struct kd35t133 *ctx = panel_to_kd35t133(panel);
169 struct drm_display_mode *mode;
170
171 mode = drm_mode_duplicate(connector->dev, &default_mode);
172 if (!mode) {
173 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
174 default_mode.hdisplay, default_mode.vdisplay,
175 drm_mode_vrefresh(&default_mode));
176 return -ENOMEM;
177 }
178
179 drm_mode_set_name(mode);
180
181 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
182 connector->display_info.width_mm = mode->width_mm;
183 connector->display_info.height_mm = mode->height_mm;
184 drm_mode_probed_add(connector, mode);
185
186 return 1;
187}
188
189static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
190{
191 struct kd35t133 *ctx = panel_to_kd35t133(panel);
192
193 return ctx->orientation;
194}
195
196static const struct drm_panel_funcs kd35t133_funcs = {
197 .unprepare = kd35t133_unprepare,
198 .prepare = kd35t133_prepare,
199 .get_modes = kd35t133_get_modes,
200 .get_orientation = kd35t133_get_orientation,
201};
202
203static int kd35t133_probe(struct mipi_dsi_device *dsi)
204{
205 struct device *dev = &dsi->dev;
206 struct kd35t133 *ctx;
207 int ret;
208
209 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
210 if (!ctx)
211 return -ENOMEM;
212
213 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
214 if (IS_ERR(ctx->reset_gpio)) {
215 dev_err(dev, "cannot get reset gpio\n");
216 return PTR_ERR(ctx->reset_gpio);
217 }
218
219 ctx->vdd = devm_regulator_get(dev, "vdd");
220 if (IS_ERR(ctx->vdd)) {
221 ret = PTR_ERR(ctx->vdd);
222 if (ret != -EPROBE_DEFER)
223 dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
224 return ret;
225 }
226
227 ctx->iovcc = devm_regulator_get(dev, "iovcc");
228 if (IS_ERR(ctx->iovcc)) {
229 ret = PTR_ERR(ctx->iovcc);
230 if (ret != -EPROBE_DEFER)
231 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
232 return ret;
233 }
234
235 ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
236 if (ret < 0) {
237 dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
238 return ret;
239 }
240
241 mipi_dsi_set_drvdata(dsi, ctx);
242
243 ctx->dev = dev;
244
245 dsi->lanes = 1;
246 dsi->format = MIPI_DSI_FMT_RGB888;
247 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
248 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
249 MIPI_DSI_CLOCK_NON_CONTINUOUS;
250
251 drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
252 DRM_MODE_CONNECTOR_DSI);
253
254 ret = drm_panel_of_backlight(&ctx->panel);
255 if (ret)
256 return ret;
257
258 drm_panel_add(&ctx->panel);
259
260 ret = mipi_dsi_attach(dsi);
261 if (ret < 0) {
262 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
263 drm_panel_remove(&ctx->panel);
264 return ret;
265 }
266
267 return 0;
268}
269
270static void kd35t133_remove(struct mipi_dsi_device *dsi)
271{
272 struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
273 int ret;
274
275 ret = mipi_dsi_detach(dsi);
276 if (ret < 0)
277 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
278
279 drm_panel_remove(&ctx->panel);
280}
281
282static const struct of_device_id kd35t133_of_match[] = {
283 { .compatible = "elida,kd35t133" },
284 { /* sentinel */ }
285};
286MODULE_DEVICE_TABLE(of, kd35t133_of_match);
287
288static struct mipi_dsi_driver kd35t133_driver = {
289 .driver = {
290 .name = "panel-elida-kd35t133",
291 .of_match_table = kd35t133_of_match,
292 },
293 .probe = kd35t133_probe,
294 .remove = kd35t133_remove,
295};
296module_mipi_dsi_driver(kd35t133_driver);
297
298MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
299MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
300MODULE_LICENSE("GPL v2");