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 Tr��nnes
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	DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable),
185};
186
187static const struct drm_display_mode yx350hv15_mode = {
188	DRM_SIMPLE_MODE(320, 480, 60, 75),
189};
190
191DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops);
192
193static const struct drm_driver hx8357d_driver = {
194	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
195	.fops			= &hx8357d_fops,
196	DRM_GEM_DMA_DRIVER_OPS_VMAP,
197	.debugfs_init		= mipi_dbi_debugfs_init,
198	.name			= "hx8357d",
199	.desc			= "HX8357D",
200	.date			= "20181023",
201	.major			= 1,
202	.minor			= 0,
203};
204
205static const struct of_device_id hx8357d_of_match[] = {
206	{ .compatible = "adafruit,yx350hv15" },
207	{ }
208};
209MODULE_DEVICE_TABLE(of, hx8357d_of_match);
210
211static const struct spi_device_id hx8357d_id[] = {
212	{ "yx350hv15", 0 },
213	{ }
214};
215MODULE_DEVICE_TABLE(spi, hx8357d_id);
216
217static int hx8357d_probe(struct spi_device *spi)
218{
219	struct device *dev = &spi->dev;
220	struct mipi_dbi_dev *dbidev;
221	struct drm_device *drm;
222	struct gpio_desc *dc;
223	u32 rotation = 0;
224	int ret;
225
226	dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver,
227				    struct mipi_dbi_dev, drm);
228	if (IS_ERR(dbidev))
229		return PTR_ERR(dbidev);
230
231	drm = &dbidev->drm;
232
233	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
234	if (IS_ERR(dc))
235		return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
236
237	dbidev->backlight = devm_of_find_backlight(dev);
238	if (IS_ERR(dbidev->backlight))
239		return PTR_ERR(dbidev->backlight);
240
241	device_property_read_u32(dev, "rotation", &rotation);
242
243	ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
244	if (ret)
245		return ret;
246
247	ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
248	if (ret)
249		return ret;
250
251	drm_mode_config_reset(drm);
252
253	ret = drm_dev_register(drm, 0);
254	if (ret)
255		return ret;
256
257	spi_set_drvdata(spi, drm);
258
259	drm_fbdev_generic_setup(drm, 0);
260
261	return 0;
262}
263
264static void hx8357d_remove(struct spi_device *spi)
265{
266	struct drm_device *drm = spi_get_drvdata(spi);
267
268	drm_dev_unplug(drm);
269	drm_atomic_helper_shutdown(drm);
270}
271
272static void hx8357d_shutdown(struct spi_device *spi)
273{
274	drm_atomic_helper_shutdown(spi_get_drvdata(spi));
275}
276
277static struct spi_driver hx8357d_spi_driver = {
278	.driver = {
279		.name = "hx8357d",
280		.of_match_table = hx8357d_of_match,
281	},
282	.id_table = hx8357d_id,
283	.probe = hx8357d_probe,
284	.remove = hx8357d_remove,
285	.shutdown = hx8357d_shutdown,
286};
287module_spi_driver(hx8357d_spi_driver);
288
289MODULE_DESCRIPTION("HX8357D DRM driver");
290MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
291MODULE_LICENSE("GPL");
292