1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * DRM driver for Ilitek ILI9341 panels
4 *
5 * Copyright 2018 David Lechner <david@lechnology.com>
6 *
7 * Based on mi0283qt.c:
8 * Copyright 2016 Noralf Trønnes
9 */
10
11 #include <linux/backlight.h>
12 #include <linux/delay.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/module.h>
15 #include <linux/property.h>
16 #include <linux/spi/spi.h>
17
18 #include <drm/clients/drm_client_setup.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_drv.h>
21 #include <drm/drm_fbdev_dma.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 ILI9341_FRMCTR1 0xb1
30 #define ILI9341_DISCTRL 0xb6
31 #define ILI9341_ETMOD 0xb7
32
33 #define ILI9341_PWCTRL1 0xc0
34 #define ILI9341_PWCTRL2 0xc1
35 #define ILI9341_VMCTRL1 0xc5
36 #define ILI9341_VMCTRL2 0xc7
37 #define ILI9341_PWCTRLA 0xcb
38 #define ILI9341_PWCTRLB 0xcf
39
40 #define ILI9341_PGAMCTRL 0xe0
41 #define ILI9341_NGAMCTRL 0xe1
42 #define ILI9341_DTCTRLA 0xe8
43 #define ILI9341_DTCTRLB 0xea
44 #define ILI9341_PWRSEQ 0xed
45
46 #define ILI9341_EN3GAM 0xf2
47 #define ILI9341_PUMPCTRL 0xf7
48
49 #define ILI9341_MADCTL_BGR BIT(3)
50 #define ILI9341_MADCTL_MV BIT(5)
51 #define ILI9341_MADCTL_MX BIT(6)
52 #define ILI9341_MADCTL_MY BIT(7)
53
yx240qv29_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)54 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
55 struct drm_crtc_state *crtc_state,
56 struct drm_plane_state *plane_state)
57 {
58 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
59 struct mipi_dbi *dbi = &dbidev->dbi;
60 u8 addr_mode;
61 int ret, idx;
62
63 if (!drm_dev_enter(pipe->crtc.dev, &idx))
64 return;
65
66 DRM_DEBUG_KMS("\n");
67
68 ret = mipi_dbi_poweron_conditional_reset(dbidev);
69 if (ret < 0)
70 goto out_exit;
71 if (ret == 1)
72 goto out_enable;
73
74 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
75
76 mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
77 mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
78 mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
79 mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
80 mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
81 mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
82
83 /* Power Control */
84 mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23);
85 mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10);
86 /* VCOM */
87 mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28);
88 mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86);
89
90 /* Memory Access Control */
91 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
92
93 /* Frame Rate */
94 mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
95
96 /* Gamma */
97 mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00);
98 mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
99 mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
100 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
101 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
102 mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
103 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
104 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
105
106 /* DDRAM */
107 mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
108
109 /* Display */
110 mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
111 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
112 msleep(100);
113
114 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
115 msleep(100);
116
117 out_enable:
118 switch (dbidev->rotation) {
119 default:
120 addr_mode = ILI9341_MADCTL_MX;
121 break;
122 case 90:
123 addr_mode = ILI9341_MADCTL_MV;
124 break;
125 case 180:
126 addr_mode = ILI9341_MADCTL_MY;
127 break;
128 case 270:
129 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
130 ILI9341_MADCTL_MX;
131 break;
132 }
133 addr_mode |= ILI9341_MADCTL_BGR;
134 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
135 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
136 out_exit:
137 drm_dev_exit(idx);
138 }
139
140 static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {
141 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable),
142 };
143
144 static const struct drm_display_mode yx240qv29_mode = {
145 DRM_SIMPLE_MODE(240, 320, 37, 49),
146 };
147
148 DEFINE_DRM_GEM_DMA_FOPS(ili9341_fops);
149
150 static const struct drm_driver ili9341_driver = {
151 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
152 .fops = &ili9341_fops,
153 DRM_GEM_DMA_DRIVER_OPS_VMAP,
154 DRM_FBDEV_DMA_DRIVER_OPS,
155 .debugfs_init = mipi_dbi_debugfs_init,
156 .name = "ili9341",
157 .desc = "Ilitek ILI9341",
158 .major = 1,
159 .minor = 0,
160 };
161
162 static const struct of_device_id ili9341_of_match[] = {
163 { .compatible = "adafruit,yx240qv29" },
164 { }
165 };
166 MODULE_DEVICE_TABLE(of, ili9341_of_match);
167
168 static const struct spi_device_id ili9341_id[] = {
169 { "yx240qv29", 0 },
170 { }
171 };
172 MODULE_DEVICE_TABLE(spi, ili9341_id);
173
ili9341_probe(struct spi_device * spi)174 static int ili9341_probe(struct spi_device *spi)
175 {
176 struct device *dev = &spi->dev;
177 struct mipi_dbi_dev *dbidev;
178 struct drm_device *drm;
179 struct mipi_dbi *dbi;
180 struct gpio_desc *dc;
181 u32 rotation = 0;
182 int ret;
183
184 dbidev = devm_drm_dev_alloc(dev, &ili9341_driver,
185 struct mipi_dbi_dev, drm);
186 if (IS_ERR(dbidev))
187 return PTR_ERR(dbidev);
188
189 dbi = &dbidev->dbi;
190 drm = &dbidev->drm;
191
192 dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
193 if (IS_ERR(dbi->reset))
194 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
195
196 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
197 if (IS_ERR(dc))
198 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
199
200 dbidev->backlight = devm_of_find_backlight(dev);
201 if (IS_ERR(dbidev->backlight))
202 return PTR_ERR(dbidev->backlight);
203
204 device_property_read_u32(dev, "rotation", &rotation);
205
206 ret = mipi_dbi_spi_init(spi, dbi, dc);
207 if (ret)
208 return ret;
209
210 ret = mipi_dbi_dev_init(dbidev, &ili9341_pipe_funcs, &yx240qv29_mode, rotation);
211 if (ret)
212 return ret;
213
214 drm_mode_config_reset(drm);
215
216 ret = drm_dev_register(drm, 0);
217 if (ret)
218 return ret;
219
220 spi_set_drvdata(spi, drm);
221
222 drm_client_setup(drm, NULL);
223
224 return 0;
225 }
226
ili9341_remove(struct spi_device * spi)227 static void ili9341_remove(struct spi_device *spi)
228 {
229 struct drm_device *drm = spi_get_drvdata(spi);
230
231 drm_dev_unplug(drm);
232 drm_atomic_helper_shutdown(drm);
233 }
234
ili9341_shutdown(struct spi_device * spi)235 static void ili9341_shutdown(struct spi_device *spi)
236 {
237 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
238 }
239
240 static struct spi_driver ili9341_spi_driver = {
241 .driver = {
242 .name = "ili9341",
243 .of_match_table = ili9341_of_match,
244 },
245 .id_table = ili9341_id,
246 .probe = ili9341_probe,
247 .remove = ili9341_remove,
248 .shutdown = ili9341_shutdown,
249 };
250 module_spi_driver(ili9341_spi_driver);
251
252 MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");
253 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
254 MODULE_LICENSE("GPL");
255