xref: /linux/drivers/gpu/drm/tiny/mi0283qt.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * DRM driver for Multi-Inno MI0283QT panels
4  *
5  * Copyright 2016 Noralf Trønnes
6  */
7 
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>
15 
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_drv.h>
18 #include <drm/drm_fbdev_dma.h>
19 #include <drm/drm_gem_atomic_helper.h>
20 #include <drm/drm_gem_dma_helper.h>
21 #include <drm/drm_managed.h>
22 #include <drm/drm_mipi_dbi.h>
23 #include <drm/drm_modeset_helper.h>
24 #include <video/mipi_display.h>
25 
26 #define ILI9341_FRMCTR1		0xb1
27 #define ILI9341_DISCTRL		0xb6
28 #define ILI9341_ETMOD		0xb7
29 
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
36 
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
42 
43 #define ILI9341_EN3GAM		0xf2
44 #define ILI9341_PUMPCTRL	0xf7
45 
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)
50 
mi0283qt_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * crtc_state,struct drm_plane_state * plane_state)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)
54 {
55 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
56 	struct mipi_dbi *dbi = &dbidev->dbi;
57 	u8 addr_mode;
58 	int ret, idx;
59 
60 	if (!drm_dev_enter(pipe->crtc.dev, &idx))
61 		return;
62 
63 	DRM_DEBUG_KMS("\n");
64 
65 	ret = mipi_dbi_poweron_conditional_reset(dbidev);
66 	if (ret < 0)
67 		goto out_exit;
68 	if (ret == 1)
69 		goto out_enable;
70 
71 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
72 
73 	mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
74 	mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
75 	mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
76 	mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
77 	mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
78 	mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
79 
80 	/* Power Control */
81 	mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x26);
82 	mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x11);
83 	/* VCOM */
84 	mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x35, 0x3e);
85 	mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0xbe);
86 
87 	/* Memory Access Control */
88 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
89 
90 	/* Frame Rate */
91 	mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
92 
93 	/* Gamma */
94 	mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x08);
95 	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
96 	mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
97 		       0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
98 		       0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
99 	mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
100 		       0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
101 		       0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
102 
103 	/* DDRAM */
104 	mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
105 
106 	/* Display */
107 	mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
108 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
109 	msleep(100);
110 
111 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
112 	msleep(100);
113 
114 out_enable:
115 	/* The PiTFT (ili9340) has a hardware reset circuit that
116 	 * resets only on power-on and not on each reboot through
117 	 * a gpio like the rpi-display does.
118 	 * As a result, we need to always apply the rotation value
119 	 * regardless of the display "on/off" state.
120 	 */
121 	switch (dbidev->rotation) {
122 	default:
123 		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
124 			    ILI9341_MADCTL_MX;
125 		break;
126 	case 90:
127 		addr_mode = ILI9341_MADCTL_MY;
128 		break;
129 	case 180:
130 		addr_mode = ILI9341_MADCTL_MV;
131 		break;
132 	case 270:
133 		addr_mode = ILI9341_MADCTL_MX;
134 		break;
135 	}
136 	addr_mode |= ILI9341_MADCTL_BGR;
137 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
138 	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
139 out_exit:
140 	drm_dev_exit(idx);
141 }
142 
143 static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
144 	DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(mi0283qt_enable),
145 };
146 
147 static const struct drm_display_mode mi0283qt_mode = {
148 	DRM_SIMPLE_MODE(320, 240, 58, 43),
149 };
150 
151 DEFINE_DRM_GEM_DMA_FOPS(mi0283qt_fops);
152 
153 static const struct drm_driver mi0283qt_driver = {
154 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
155 	.fops			= &mi0283qt_fops,
156 	DRM_GEM_DMA_DRIVER_OPS_VMAP,
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 
165 static const struct of_device_id mi0283qt_of_match[] = {
166 	{ .compatible = "multi-inno,mi0283qt" },
167 	{},
168 };
169 MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
170 
171 static const struct spi_device_id mi0283qt_id[] = {
172 	{ "mi0283qt", 0 },
173 	{ },
174 };
175 MODULE_DEVICE_TABLE(spi, mi0283qt_id);
176 
mi0283qt_probe(struct spi_device * spi)177 static int mi0283qt_probe(struct spi_device *spi)
178 {
179 	struct device *dev = &spi->dev;
180 	struct mipi_dbi_dev *dbidev;
181 	struct drm_device *drm;
182 	struct mipi_dbi *dbi;
183 	struct gpio_desc *dc;
184 	u32 rotation = 0;
185 	int ret;
186 
187 	dbidev = devm_drm_dev_alloc(dev, &mi0283qt_driver,
188 				    struct mipi_dbi_dev, drm);
189 	if (IS_ERR(dbidev))
190 		return PTR_ERR(dbidev);
191 
192 	dbi = &dbidev->dbi;
193 	drm = &dbidev->drm;
194 
195 	dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
196 	if (IS_ERR(dbi->reset))
197 		return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
198 
199 	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
200 	if (IS_ERR(dc))
201 		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
202 
203 	dbidev->regulator = devm_regulator_get(dev, "power");
204 	if (IS_ERR(dbidev->regulator))
205 		return PTR_ERR(dbidev->regulator);
206 
207 	dbidev->backlight = devm_of_find_backlight(dev);
208 	if (IS_ERR(dbidev->backlight))
209 		return PTR_ERR(dbidev->backlight);
210 
211 	device_property_read_u32(dev, "rotation", &rotation);
212 
213 	ret = mipi_dbi_spi_init(spi, dbi, dc);
214 	if (ret)
215 		return ret;
216 
217 	ret = mipi_dbi_dev_init(dbidev, &mi0283qt_pipe_funcs, &mi0283qt_mode, rotation);
218 	if (ret)
219 		return ret;
220 
221 	drm_mode_config_reset(drm);
222 
223 	ret = drm_dev_register(drm, 0);
224 	if (ret)
225 		return ret;
226 
227 	spi_set_drvdata(spi, drm);
228 
229 	drm_fbdev_dma_setup(drm, 0);
230 
231 	return 0;
232 }
233 
mi0283qt_remove(struct spi_device * spi)234 static void mi0283qt_remove(struct spi_device *spi)
235 {
236 	struct drm_device *drm = spi_get_drvdata(spi);
237 
238 	drm_dev_unplug(drm);
239 	drm_atomic_helper_shutdown(drm);
240 }
241 
mi0283qt_shutdown(struct spi_device * spi)242 static void mi0283qt_shutdown(struct spi_device *spi)
243 {
244 	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
245 }
246 
mi0283qt_pm_suspend(struct device * dev)247 static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
248 {
249 	return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
250 }
251 
mi0283qt_pm_resume(struct device * dev)252 static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
253 {
254 	drm_mode_config_helper_resume(dev_get_drvdata(dev));
255 
256 	return 0;
257 }
258 
259 static const struct dev_pm_ops mi0283qt_pm_ops = {
260 	SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
261 };
262 
263 static struct spi_driver mi0283qt_spi_driver = {
264 	.driver = {
265 		.name = "mi0283qt",
266 		.of_match_table = mi0283qt_of_match,
267 		.pm = &mi0283qt_pm_ops,
268 	},
269 	.id_table = mi0283qt_id,
270 	.probe = mi0283qt_probe,
271 	.remove = mi0283qt_remove,
272 	.shutdown = mi0283qt_shutdown,
273 };
274 module_spi_driver(mi0283qt_spi_driver);
275 
276 MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
277 MODULE_AUTHOR("Noralf Trønnes");
278 MODULE_LICENSE("GPL");
279