1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * DRM driver for Multi-Inno MI0283QT panels
5 * Copyright 2016 Noralf Trønnes
8 #include <linux/backlight.h>
9 #include <linux/delay.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/module.h>
12 #include <linux/property.h>
13 #include <linux/regulator/consumer.h>
14 #include <linux/spi/spi.h>
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_drv.h>
18 #include <drm/drm_fb_helper.h>
19 #include <drm/drm_gem_cma_helper.h>
20 #include <drm/drm_gem_framebuffer_helper.h>
21 #include <drm/drm_modeset_helper.h>
22 #include <drm/tinydrm/mipi-dbi.h>
23 #include <drm/tinydrm/tinydrm-helpers.h>
24 #include <video/mipi_display.h>
26 #define ILI9341_FRMCTR1 0xb1
27 #define ILI9341_DISCTRL 0xb6
28 #define ILI9341_ETMOD 0xb7
30 #define ILI9341_PWCTRL1 0xc0
31 #define ILI9341_PWCTRL2 0xc1
32 #define ILI9341_VMCTRL1 0xc5
33 #define ILI9341_VMCTRL2 0xc7
34 #define ILI9341_PWCTRLA 0xcb
35 #define ILI9341_PWCTRLB 0xcf
37 #define ILI9341_PGAMCTRL 0xe0
38 #define ILI9341_NGAMCTRL 0xe1
39 #define ILI9341_DTCTRLA 0xe8
40 #define ILI9341_DTCTRLB 0xea
41 #define ILI9341_PWRSEQ 0xed
43 #define ILI9341_EN3GAM 0xf2
44 #define ILI9341_PUMPCTRL 0xf7
46 #define ILI9341_MADCTL_BGR BIT(3)
47 #define ILI9341_MADCTL_MV BIT(5)
48 #define ILI9341_MADCTL_MX BIT(6)
49 #define ILI9341_MADCTL_MY BIT(7)
51 static void mi0283qt_enable(struct drm_simple_display_pipe *pipe,
52 struct drm_crtc_state *crtc_state,
53 struct drm_plane_state *plane_state)
55 struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
59 if (!drm_dev_enter(pipe->crtc.dev, &idx))
64 ret = mipi_dbi_poweron_conditional_reset(mipi);
70 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
72 mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
73 mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
74 mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
75 mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
76 mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
77 mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
80 mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x26);
81 mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
83 mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
84 mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
86 /* Memory Access Control */
87 mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
90 mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
93 mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x08);
94 mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
95 mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
96 0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
97 0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
98 mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
99 0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
100 0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
103 mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
106 mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
107 mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
110 mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
114 /* The PiTFT (ili9340) has a hardware reset circuit that
115 * resets only on power-on and not on each reboot through
116 * a gpio like the rpi-display does.
117 * As a result, we need to always apply the rotation value
118 * regardless of the display "on/off" state.
120 switch (mipi->rotation) {
122 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
126 addr_mode = ILI9341_MADCTL_MY;
129 addr_mode = ILI9341_MADCTL_MV;
132 addr_mode = ILI9341_MADCTL_MX;
135 addr_mode |= ILI9341_MADCTL_BGR;
136 mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
137 mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
142 static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
143 .enable = mi0283qt_enable,
144 .disable = mipi_dbi_pipe_disable,
145 .update = mipi_dbi_pipe_update,
146 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
149 static const struct drm_display_mode mi0283qt_mode = {
150 DRM_SIMPLE_MODE(320, 240, 58, 43),
153 DEFINE_DRM_GEM_CMA_FOPS(mi0283qt_fops);
155 static struct drm_driver mi0283qt_driver = {
156 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
158 .fops = &mi0283qt_fops,
159 .release = mipi_dbi_release,
160 DRM_GEM_CMA_VMAP_DRIVER_OPS,
161 .debugfs_init = mipi_dbi_debugfs_init,
163 .desc = "Multi-Inno MI0283QT",
169 static const struct of_device_id mi0283qt_of_match[] = {
170 { .compatible = "multi-inno,mi0283qt" },
173 MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
175 static const struct spi_device_id mi0283qt_id[] = {
179 MODULE_DEVICE_TABLE(spi, mi0283qt_id);
181 static int mi0283qt_probe(struct spi_device *spi)
183 struct device *dev = &spi->dev;
184 struct drm_device *drm;
185 struct mipi_dbi *mipi;
186 struct gpio_desc *dc;
190 mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
195 ret = devm_drm_dev_init(dev, drm, &mi0283qt_driver);
201 drm_mode_config_init(drm);
203 mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
204 if (IS_ERR(mipi->reset)) {
205 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
206 return PTR_ERR(mipi->reset);
209 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
211 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
215 mipi->regulator = devm_regulator_get(dev, "power");
216 if (IS_ERR(mipi->regulator))
217 return PTR_ERR(mipi->regulator);
219 mipi->backlight = devm_of_find_backlight(dev);
220 if (IS_ERR(mipi->backlight))
221 return PTR_ERR(mipi->backlight);
223 device_property_read_u32(dev, "rotation", &rotation);
225 ret = mipi_dbi_spi_init(spi, mipi, dc);
229 ret = mipi_dbi_init(mipi, &mi0283qt_pipe_funcs, &mi0283qt_mode, rotation);
233 drm_mode_config_reset(drm);
235 ret = drm_dev_register(drm, 0);
239 spi_set_drvdata(spi, drm);
241 drm_fbdev_generic_setup(drm, 0);
246 static int mi0283qt_remove(struct spi_device *spi)
248 struct drm_device *drm = spi_get_drvdata(spi);
251 drm_atomic_helper_shutdown(drm);
256 static void mi0283qt_shutdown(struct spi_device *spi)
258 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
261 static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
263 return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
266 static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
268 drm_mode_config_helper_resume(dev_get_drvdata(dev));
273 static const struct dev_pm_ops mi0283qt_pm_ops = {
274 SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
277 static struct spi_driver mi0283qt_spi_driver = {
280 .owner = THIS_MODULE,
281 .of_match_table = mi0283qt_of_match,
282 .pm = &mi0283qt_pm_ops,
284 .id_table = mi0283qt_id,
285 .probe = mi0283qt_probe,
286 .remove = mi0283qt_remove,
287 .shutdown = mi0283qt_shutdown,
289 module_spi_driver(mi0283qt_spi_driver);
291 MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
292 MODULE_AUTHOR("Noralf Trønnes");
293 MODULE_LICENSE("GPL");