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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/drm_atomic_helper.h>
20#include <drm/drm_drv.h>
21#include <drm/drm_fbdev_generic.h>
22#include <drm/drm_gem_atomic_helper.h>
23#include <drm/drm_gem_dma_helper.h>
24#include <drm/drm_managed.h>
25#include <drm/drm_mipi_dbi.h>
26#include <drm/drm_modeset_helper.h>
27#include <video/mipi_display.h>
28
29#define HX8357D_SETOSC 0xb0
30#define HX8357D_SETPOWER 0xb1
31#define HX8357D_SETRGB 0xb3
32#define HX8357D_SETCYC 0xb3
33#define HX8357D_SETCOM 0xb6
34#define HX8357D_SETEXTC 0xb9
35#define HX8357D_SETSTBA 0xc0
36#define HX8357D_SETPANEL 0xcc
37#define HX8357D_SETGAMMA 0xe0
38
39#define HX8357D_MADCTL_MY 0x80
40#define HX8357D_MADCTL_MX 0x40
41#define HX8357D_MADCTL_MV 0x20
42#define HX8357D_MADCTL_ML 0x10
43#define HX8357D_MADCTL_RGB 0x00
44#define HX8357D_MADCTL_BGR 0x08
45#define HX8357D_MADCTL_MH 0x04
46
47static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
48 struct drm_crtc_state *crtc_state,
49 struct drm_plane_state *plane_state)
50{
51 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
52 struct mipi_dbi *dbi = &dbidev->dbi;
53 u8 addr_mode;
54 int ret, idx;
55
56 if (!drm_dev_enter(pipe->crtc.dev, &idx))
57 return;
58
59 DRM_DEBUG_KMS("\n");
60
61 ret = mipi_dbi_poweron_conditional_reset(dbidev);
62 if (ret < 0)
63 goto out_exit;
64 if (ret == 1)
65 goto out_enable;
66
67 /* setextc */
68 mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57);
69 msleep(150);
70
71 /* setRGB which also enables SDO */
72 mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06);
73
74 /* -1.52V */
75 mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25);
76
77 /* Normal mode 70Hz, Idle mode 55 Hz */
78 mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68);
79
80 /* Set Panel - BGR, Gate direction swapped */
81 mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05);
82
83 mipi_dbi_command(dbi, HX8357D_SETPOWER,
84 0x00, /* Not deep standby */
85 0x15, /* BT */
86 0x1C, /* VSPR */
87 0x1C, /* VSNR */
88 0x83, /* AP */
89 0xAA); /* FS */
90
91 mipi_dbi_command(dbi, HX8357D_SETSTBA,
92 0x50, /* OPON normal */
93 0x50, /* OPON idle */
94 0x01, /* STBA */
95 0x3C, /* STBA */
96 0x1E, /* STBA */
97 0x08); /* GEN */
98
99 mipi_dbi_command(dbi, HX8357D_SETCYC,
100 0x02, /* NW 0x02 */
101 0x40, /* RTN */
102 0x00, /* DIV */
103 0x2A, /* DUM */
104 0x2A, /* DUM */
105 0x0D, /* GDON */
106 0x78); /* GDOFF */
107
108 mipi_dbi_command(dbi, HX8357D_SETGAMMA,
109 0x02,
110 0x0A,
111 0x11,
112 0x1d,
113 0x23,
114 0x35,
115 0x41,
116 0x4b,
117 0x4b,
118 0x42,
119 0x3A,
120 0x27,
121 0x1B,
122 0x08,
123 0x09,
124 0x03,
125 0x02,
126 0x0A,
127 0x11,
128 0x1d,
129 0x23,
130 0x35,
131 0x41,
132 0x4b,
133 0x4b,
134 0x42,
135 0x3A,
136 0x27,
137 0x1B,
138 0x08,
139 0x09,
140 0x03,
141 0x00,
142 0x01);
143
144 /* 16 bit */
145 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
146 MIPI_DCS_PIXEL_FMT_16BIT);
147
148 /* TE off */
149 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00);
150
151 /* tear line */
152 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
153
154 /* Exit Sleep */
155 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
156 msleep(150);
157
158 /* display on */
159 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
160 usleep_range(5000, 7000);
161
162out_enable:
163 switch (dbidev->rotation) {
164 default:
165 addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
166 break;
167 case 90:
168 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
169 break;
170 case 180:
171 addr_mode = 0;
172 break;
173 case 270:
174 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
175 break;
176 }
177 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
178 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
179out_exit:
180 drm_dev_exit(idx);
181}
182
183static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = {
184 .mode_valid = mipi_dbi_pipe_mode_valid,
185 .enable = yx240qv29_enable,
186 .disable = mipi_dbi_pipe_disable,
187 .update = mipi_dbi_pipe_update,
188};
189
190static const struct drm_display_mode yx350hv15_mode = {
191 DRM_SIMPLE_MODE(320, 480, 60, 75),
192};
193
194DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops);
195
196static const struct drm_driver hx8357d_driver = {
197 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
198 .fops = &hx8357d_fops,
199 DRM_GEM_DMA_DRIVER_OPS_VMAP,
200 .debugfs_init = mipi_dbi_debugfs_init,
201 .name = "hx8357d",
202 .desc = "HX8357D",
203 .date = "20181023",
204 .major = 1,
205 .minor = 0,
206};
207
208static const struct of_device_id hx8357d_of_match[] = {
209 { .compatible = "adafruit,yx350hv15" },
210 { }
211};
212MODULE_DEVICE_TABLE(of, hx8357d_of_match);
213
214static const struct spi_device_id hx8357d_id[] = {
215 { "yx350hv15", 0 },
216 { }
217};
218MODULE_DEVICE_TABLE(spi, hx8357d_id);
219
220static int hx8357d_probe(struct spi_device *spi)
221{
222 struct device *dev = &spi->dev;
223 struct mipi_dbi_dev *dbidev;
224 struct drm_device *drm;
225 struct gpio_desc *dc;
226 u32 rotation = 0;
227 int ret;
228
229 dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver,
230 struct mipi_dbi_dev, drm);
231 if (IS_ERR(dbidev))
232 return PTR_ERR(dbidev);
233
234 drm = &dbidev->drm;
235
236 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
237 if (IS_ERR(dc))
238 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
239
240 dbidev->backlight = devm_of_find_backlight(dev);
241 if (IS_ERR(dbidev->backlight))
242 return PTR_ERR(dbidev->backlight);
243
244 device_property_read_u32(dev, "rotation", &rotation);
245
246 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
247 if (ret)
248 return ret;
249
250 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
251 if (ret)
252 return ret;
253
254 drm_mode_config_reset(drm);
255
256 ret = drm_dev_register(drm, 0);
257 if (ret)
258 return ret;
259
260 spi_set_drvdata(spi, drm);
261
262 drm_fbdev_generic_setup(drm, 0);
263
264 return 0;
265}
266
267static void hx8357d_remove(struct spi_device *spi)
268{
269 struct drm_device *drm = spi_get_drvdata(spi);
270
271 drm_dev_unplug(drm);
272 drm_atomic_helper_shutdown(drm);
273}
274
275static void hx8357d_shutdown(struct spi_device *spi)
276{
277 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
278}
279
280static struct spi_driver hx8357d_spi_driver = {
281 .driver = {
282 .name = "hx8357d",
283 .of_match_table = hx8357d_of_match,
284 },
285 .id_table = hx8357d_id,
286 .probe = hx8357d_probe,
287 .remove = hx8357d_remove,
288 .shutdown = hx8357d_shutdown,
289};
290module_spi_driver(hx8357d_spi_driver);
291
292MODULE_DESCRIPTION("HX8357D DRM driver");
293MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
294MODULE_LICENSE("GPL");