1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * DRM driver for the HX8357D LCD controller
4 *
5 * Copyright 2018 Broadcom
6 * Copyright 2018 David Lechner <david@lechnology.com>
7 * Copyright 2016 Noralf Trønnes
8 * Copyright (C) 2015 Adafruit Industries
9 * Copyright (C) 2013 Christian Vogelgsang
10 */
11
12 #include <linux/backlight.h>
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/module.h>
16 #include <linux/property.h>
17 #include <linux/spi/spi.h>
18
19 #include <drm/clients/drm_client_setup.h>
20 #include <drm/drm_atomic_helper.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_fbdev_dma.h>
23 #include <drm/drm_gem_atomic_helper.h>
24 #include <drm/drm_gem_dma_helper.h>
25 #include <drm/drm_managed.h>
26 #include <drm/drm_mipi_dbi.h>
27 #include <drm/drm_modeset_helper.h>
28 #include <video/mipi_display.h>
29
30 #define HX8357D_SETOSC 0xb0
31 #define HX8357D_SETPOWER 0xb1
32 #define HX8357D_SETRGB 0xb3
33 #define HX8357D_SETCYC 0xb3
34 #define HX8357D_SETCOM 0xb6
35 #define HX8357D_SETEXTC 0xb9
36 #define HX8357D_SETSTBA 0xc0
37 #define HX8357D_SETPANEL 0xcc
38 #define HX8357D_SETGAMMA 0xe0
39
40 #define HX8357D_MADCTL_MY 0x80
41 #define HX8357D_MADCTL_MX 0x40
42 #define HX8357D_MADCTL_MV 0x20
43 #define HX8357D_MADCTL_ML 0x10
44 #define HX8357D_MADCTL_RGB 0x00
45 #define HX8357D_MADCTL_BGR 0x08
46 #define HX8357D_MADCTL_MH 0x04
47
yx240qv29_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)48 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
49 struct drm_crtc_state *crtc_state,
50 struct drm_plane_state *plane_state)
51 {
52 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
53 struct mipi_dbi *dbi = &dbidev->dbi;
54 u8 addr_mode;
55 int ret, idx;
56
57 if (!drm_dev_enter(pipe->crtc.dev, &idx))
58 return;
59
60 DRM_DEBUG_KMS("\n");
61
62 ret = mipi_dbi_poweron_conditional_reset(dbidev);
63 if (ret < 0)
64 goto out_exit;
65 if (ret == 1)
66 goto out_enable;
67
68 /* setextc */
69 mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57);
70 msleep(150);
71
72 /* setRGB which also enables SDO */
73 mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06);
74
75 /* -1.52V */
76 mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25);
77
78 /* Normal mode 70Hz, Idle mode 55 Hz */
79 mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68);
80
81 /* Set Panel - BGR, Gate direction swapped */
82 mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05);
83
84 mipi_dbi_command(dbi, HX8357D_SETPOWER,
85 0x00, /* Not deep standby */
86 0x15, /* BT */
87 0x1C, /* VSPR */
88 0x1C, /* VSNR */
89 0x83, /* AP */
90 0xAA); /* FS */
91
92 mipi_dbi_command(dbi, HX8357D_SETSTBA,
93 0x50, /* OPON normal */
94 0x50, /* OPON idle */
95 0x01, /* STBA */
96 0x3C, /* STBA */
97 0x1E, /* STBA */
98 0x08); /* GEN */
99
100 mipi_dbi_command(dbi, HX8357D_SETCYC,
101 0x02, /* NW 0x02 */
102 0x40, /* RTN */
103 0x00, /* DIV */
104 0x2A, /* DUM */
105 0x2A, /* DUM */
106 0x0D, /* GDON */
107 0x78); /* GDOFF */
108
109 mipi_dbi_command(dbi, HX8357D_SETGAMMA,
110 0x02,
111 0x0A,
112 0x11,
113 0x1d,
114 0x23,
115 0x35,
116 0x41,
117 0x4b,
118 0x4b,
119 0x42,
120 0x3A,
121 0x27,
122 0x1B,
123 0x08,
124 0x09,
125 0x03,
126 0x02,
127 0x0A,
128 0x11,
129 0x1d,
130 0x23,
131 0x35,
132 0x41,
133 0x4b,
134 0x4b,
135 0x42,
136 0x3A,
137 0x27,
138 0x1B,
139 0x08,
140 0x09,
141 0x03,
142 0x00,
143 0x01);
144
145 /* 16 bit */
146 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
147 MIPI_DCS_PIXEL_FMT_16BIT);
148
149 /* TE off */
150 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00);
151
152 /* tear line */
153 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
154
155 /* Exit Sleep */
156 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
157 msleep(150);
158
159 /* display on */
160 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
161 usleep_range(5000, 7000);
162
163 out_enable:
164 switch (dbidev->rotation) {
165 default:
166 addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
167 break;
168 case 90:
169 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
170 break;
171 case 180:
172 addr_mode = 0;
173 break;
174 case 270:
175 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
176 break;
177 }
178 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
179 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
180 out_exit:
181 drm_dev_exit(idx);
182 }
183
184 static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = {
185 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable),
186 };
187
188 static const struct drm_display_mode yx350hv15_mode = {
189 DRM_SIMPLE_MODE(320, 480, 60, 75),
190 };
191
192 DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops);
193
194 static const struct drm_driver hx8357d_driver = {
195 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
196 .fops = &hx8357d_fops,
197 DRM_GEM_DMA_DRIVER_OPS_VMAP,
198 DRM_FBDEV_DMA_DRIVER_OPS,
199 .debugfs_init = mipi_dbi_debugfs_init,
200 .name = "hx8357d",
201 .desc = "HX8357D",
202 .major = 1,
203 .minor = 0,
204 };
205
206 static const struct of_device_id hx8357d_of_match[] = {
207 { .compatible = "adafruit,yx350hv15" },
208 { }
209 };
210 MODULE_DEVICE_TABLE(of, hx8357d_of_match);
211
212 static const struct spi_device_id hx8357d_id[] = {
213 { "yx350hv15", 0 },
214 { }
215 };
216 MODULE_DEVICE_TABLE(spi, hx8357d_id);
217
hx8357d_probe(struct spi_device * spi)218 static int hx8357d_probe(struct spi_device *spi)
219 {
220 struct device *dev = &spi->dev;
221 struct mipi_dbi_dev *dbidev;
222 struct drm_device *drm;
223 struct gpio_desc *dc;
224 u32 rotation = 0;
225 int ret;
226
227 dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver,
228 struct mipi_dbi_dev, drm);
229 if (IS_ERR(dbidev))
230 return PTR_ERR(dbidev);
231
232 drm = &dbidev->drm;
233
234 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
235 if (IS_ERR(dc))
236 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
237
238 dbidev->backlight = devm_of_find_backlight(dev);
239 if (IS_ERR(dbidev->backlight))
240 return PTR_ERR(dbidev->backlight);
241
242 device_property_read_u32(dev, "rotation", &rotation);
243
244 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
245 if (ret)
246 return ret;
247
248 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
249 if (ret)
250 return ret;
251
252 drm_mode_config_reset(drm);
253
254 ret = drm_dev_register(drm, 0);
255 if (ret)
256 return ret;
257
258 spi_set_drvdata(spi, drm);
259
260 drm_client_setup(drm, NULL);
261
262 return 0;
263 }
264
hx8357d_remove(struct spi_device * spi)265 static void hx8357d_remove(struct spi_device *spi)
266 {
267 struct drm_device *drm = spi_get_drvdata(spi);
268
269 drm_dev_unplug(drm);
270 drm_atomic_helper_shutdown(drm);
271 }
272
hx8357d_shutdown(struct spi_device * spi)273 static void hx8357d_shutdown(struct spi_device *spi)
274 {
275 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
276 }
277
278 static struct spi_driver hx8357d_spi_driver = {
279 .driver = {
280 .name = "hx8357d",
281 .of_match_table = hx8357d_of_match,
282 },
283 .id_table = hx8357d_id,
284 .probe = hx8357d_probe,
285 .remove = hx8357d_remove,
286 .shutdown = hx8357d_shutdown,
287 };
288 module_spi_driver(hx8357d_spi_driver);
289
290 MODULE_DESCRIPTION("HX8357D DRM driver");
291 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
292 MODULE_LICENSE("GPL");
293