tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * DRM driver for Multi-Inno MI0283QT panels
3 *
4 * Copyright 2016 Noralf Trønnes
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
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/regulator/consumer.h>
18#include <linux/spi/spi.h>
19
20#include <drm/drm_fb_helper.h>
21#include <drm/drm_modeset_helper.h>
22#include <drm/drm_gem_framebuffer_helper.h>
23#include <drm/tinydrm/mipi-dbi.h>
24#include <drm/tinydrm/tinydrm-helpers.h>
25#include <video/mipi_display.h>
26
27#define ILI9341_FRMCTR1 0xb1
28#define ILI9341_DISCTRL 0xb6
29#define ILI9341_ETMOD 0xb7
30
31#define ILI9341_PWCTRL1 0xc0
32#define ILI9341_PWCTRL2 0xc1
33#define ILI9341_VMCTRL1 0xc5
34#define ILI9341_VMCTRL2 0xc7
35#define ILI9341_PWCTRLA 0xcb
36#define ILI9341_PWCTRLB 0xcf
37
38#define ILI9341_PGAMCTRL 0xe0
39#define ILI9341_NGAMCTRL 0xe1
40#define ILI9341_DTCTRLA 0xe8
41#define ILI9341_DTCTRLB 0xea
42#define ILI9341_PWRSEQ 0xed
43
44#define ILI9341_EN3GAM 0xf2
45#define ILI9341_PUMPCTRL 0xf7
46
47#define ILI9341_MADCTL_BGR BIT(3)
48#define ILI9341_MADCTL_MV BIT(5)
49#define ILI9341_MADCTL_MX BIT(6)
50#define ILI9341_MADCTL_MY BIT(7)
51
52static void mi0283qt_enable(struct drm_simple_display_pipe *pipe,
53 struct drm_crtc_state *crtc_state,
54 struct drm_plane_state *plane_state)
55{
56 struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
57 struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
58 u8 addr_mode;
59 int ret;
60
61 DRM_DEBUG_KMS("\n");
62
63 ret = mipi_dbi_poweron_conditional_reset(mipi);
64 if (ret < 0)
65 return;
66 if (ret == 1)
67 goto out_enable;
68
69 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
70
71 mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
72 mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
73 mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
74 mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
75 mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
76 mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
77
78 /* Power Control */
79 mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x26);
80 mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
81 /* VCOM */
82 mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
83 mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
84
85 /* Memory Access Control */
86 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
87
88 /* Frame Rate */
89 mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
90
91 /* Gamma */
92 mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x08);
93 mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
94 mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
95 0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
96 0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
97 mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
98 0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
99 0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
100
101 /* DDRAM */
102 mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
103
104 /* Display */
105 mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
106 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
107 msleep(100);
108
109 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
110 msleep(100);
111
112out_enable:
113 /* The PiTFT (ili9340) has a hardware reset circuit that
114 * resets only on power-on and not on each reboot through
115 * a gpio like the rpi-display does.
116 * As a result, we need to always apply the rotation value
117 * regardless of the display "on/off" state.
118 */
119 switch (mipi->rotation) {
120 default:
121 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
122 ILI9341_MADCTL_MX;
123 break;
124 case 90:
125 addr_mode = ILI9341_MADCTL_MY;
126 break;
127 case 180:
128 addr_mode = ILI9341_MADCTL_MV;
129 break;
130 case 270:
131 addr_mode = ILI9341_MADCTL_MX;
132 break;
133 }
134 addr_mode |= ILI9341_MADCTL_BGR;
135 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
136 mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
137}
138
139static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
140 .enable = mi0283qt_enable,
141 .disable = mipi_dbi_pipe_disable,
142 .update = tinydrm_display_pipe_update,
143 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
144};
145
146static const struct drm_display_mode mi0283qt_mode = {
147 TINYDRM_MODE(320, 240, 58, 43),
148};
149
150DEFINE_DRM_GEM_CMA_FOPS(mi0283qt_fops);
151
152static struct drm_driver mi0283qt_driver = {
153 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
154 DRIVER_ATOMIC,
155 .fops = &mi0283qt_fops,
156 TINYDRM_GEM_DRIVER_OPS,
157 .debugfs_init = mipi_dbi_debugfs_init,
158 .name = "mi0283qt",
159 .desc = "Multi-Inno MI0283QT",
160 .date = "20160614",
161 .major = 1,
162 .minor = 0,
163};
164
165static const struct of_device_id mi0283qt_of_match[] = {
166 { .compatible = "multi-inno,mi0283qt" },
167 {},
168};
169MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
170
171static const struct spi_device_id mi0283qt_id[] = {
172 { "mi0283qt", 0 },
173 { },
174};
175MODULE_DEVICE_TABLE(spi, mi0283qt_id);
176
177static int mi0283qt_probe(struct spi_device *spi)
178{
179 struct device *dev = &spi->dev;
180 struct mipi_dbi *mipi;
181 struct gpio_desc *dc;
182 u32 rotation = 0;
183 int ret;
184
185 mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
186 if (!mipi)
187 return -ENOMEM;
188
189 mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
190 if (IS_ERR(mipi->reset)) {
191 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
192 return PTR_ERR(mipi->reset);
193 }
194
195 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
196 if (IS_ERR(dc)) {
197 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
198 return PTR_ERR(dc);
199 }
200
201 mipi->regulator = devm_regulator_get(dev, "power");
202 if (IS_ERR(mipi->regulator))
203 return PTR_ERR(mipi->regulator);
204
205 mipi->backlight = devm_of_find_backlight(dev);
206 if (IS_ERR(mipi->backlight))
207 return PTR_ERR(mipi->backlight);
208
209 device_property_read_u32(dev, "rotation", &rotation);
210
211 ret = mipi_dbi_spi_init(spi, mipi, dc);
212 if (ret)
213 return ret;
214
215 ret = mipi_dbi_init(&spi->dev, mipi, &mi0283qt_pipe_funcs,
216 &mi0283qt_driver, &mi0283qt_mode, rotation);
217 if (ret)
218 return ret;
219
220 spi_set_drvdata(spi, mipi);
221
222 return devm_tinydrm_register(&mipi->tinydrm);
223}
224
225static void mi0283qt_shutdown(struct spi_device *spi)
226{
227 struct mipi_dbi *mipi = spi_get_drvdata(spi);
228
229 tinydrm_shutdown(&mipi->tinydrm);
230}
231
232static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
233{
234 struct mipi_dbi *mipi = dev_get_drvdata(dev);
235
236 return drm_mode_config_helper_suspend(mipi->tinydrm.drm);
237}
238
239static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
240{
241 struct mipi_dbi *mipi = dev_get_drvdata(dev);
242
243 drm_mode_config_helper_resume(mipi->tinydrm.drm);
244
245 return 0;
246}
247
248static const struct dev_pm_ops mi0283qt_pm_ops = {
249 SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
250};
251
252static struct spi_driver mi0283qt_spi_driver = {
253 .driver = {
254 .name = "mi0283qt",
255 .owner = THIS_MODULE,
256 .of_match_table = mi0283qt_of_match,
257 .pm = &mi0283qt_pm_ops,
258 },
259 .id_table = mi0283qt_id,
260 .probe = mi0283qt_probe,
261 .shutdown = mi0283qt_shutdown,
262};
263module_spi_driver(mi0283qt_spi_driver);
264
265MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
266MODULE_AUTHOR("Noralf Trønnes");
267MODULE_LICENSE("GPL");