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a9fe713d SP |
1 | /* |
2 | * NXP PTN3460 DP/LVDS bridge driver | |
3 | * | |
4 | * Copyright (C) 2013 Google, Inc. | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
94d50d57 AK |
16 | #include <linux/delay.h> |
17 | #include <linux/gpio.h> | |
dad3c350 | 18 | #include <linux/gpio/consumer.h> |
94d50d57 | 19 | #include <linux/i2c.h> |
a9fe713d SP |
20 | #include <linux/module.h> |
21 | #include <linux/of.h> | |
22 | #include <linux/of_gpio.h> | |
191436c4 MY |
23 | #include <drm/drm_atomic_helper.h> |
24 | #include <drm/drm_crtc.h> | |
191436c4 | 25 | #include <drm/drm_edid.h> |
ebc94461 | 26 | #include <drm/drm_of.h> |
5bbb9a2e | 27 | #include <drm/drm_panel.h> |
fcd70cd3 | 28 | #include <drm/drm_probe_helper.h> |
191436c4 | 29 | #include <drm/drmP.h> |
a9fe713d SP |
30 | |
31 | #define PTN3460_EDID_ADDR 0x0 | |
32 | #define PTN3460_EDID_EMULATION_ADDR 0x84 | |
33 | #define PTN3460_EDID_ENABLE_EMULATION 0 | |
34 | #define PTN3460_EDID_EMULATION_SELECTION 1 | |
35 | #define PTN3460_EDID_SRAM_LOAD_ADDR 0x85 | |
36 | ||
37 | struct ptn3460_bridge { | |
38 | struct drm_connector connector; | |
39 | struct i2c_client *client; | |
94d50d57 | 40 | struct drm_bridge bridge; |
a9fe713d | 41 | struct edid *edid; |
5bbb9a2e | 42 | struct drm_panel *panel; |
af478d88 AK |
43 | struct gpio_desc *gpio_pd_n; |
44 | struct gpio_desc *gpio_rst_n; | |
a9fe713d SP |
45 | u32 edid_emulation; |
46 | bool enabled; | |
47 | }; | |
48 | ||
94d50d57 AK |
49 | static inline struct ptn3460_bridge * |
50 | bridge_to_ptn3460(struct drm_bridge *bridge) | |
51 | { | |
52 | return container_of(bridge, struct ptn3460_bridge, bridge); | |
53 | } | |
54 | ||
55 | static inline struct ptn3460_bridge * | |
56 | connector_to_ptn3460(struct drm_connector *connector) | |
57 | { | |
58 | return container_of(connector, struct ptn3460_bridge, connector); | |
59 | } | |
60 | ||
a9fe713d SP |
61 | static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr, |
62 | u8 *buf, int len) | |
63 | { | |
64 | int ret; | |
65 | ||
66 | ret = i2c_master_send(ptn_bridge->client, &addr, 1); | |
67 | if (ret <= 0) { | |
68 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | ret = i2c_master_recv(ptn_bridge->client, buf, len); | |
73 | if (ret <= 0) { | |
74 | DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr, | |
82 | char val) | |
83 | { | |
84 | int ret; | |
85 | char buf[2]; | |
86 | ||
87 | buf[0] = addr; | |
88 | buf[1] = val; | |
89 | ||
90 | ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf)); | |
91 | if (ret <= 0) { | |
92 | DRM_ERROR("Failed to send i2c command, ret=%d\n", ret); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge) | |
100 | { | |
101 | int ret; | |
102 | char val; | |
103 | ||
104 | /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */ | |
105 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR, | |
106 | ptn_bridge->edid_emulation); | |
107 | if (ret) { | |
94d50d57 | 108 | DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret); |
a9fe713d SP |
109 | return ret; |
110 | } | |
111 | ||
112 | /* Enable EDID emulation and select the desired EDID */ | |
113 | val = 1 << PTN3460_EDID_ENABLE_EMULATION | | |
114 | ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION; | |
115 | ||
116 | ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val); | |
117 | if (ret) { | |
94d50d57 | 118 | DRM_ERROR("Failed to write EDID value, ret=%d\n", ret); |
a9fe713d SP |
119 | return ret; |
120 | } | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static void ptn3460_pre_enable(struct drm_bridge *bridge) | |
126 | { | |
94d50d57 | 127 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d SP |
128 | int ret; |
129 | ||
130 | if (ptn_bridge->enabled) | |
131 | return; | |
132 | ||
af478d88 | 133 | gpiod_set_value(ptn_bridge->gpio_pd_n, 1); |
a9fe713d | 134 | |
af478d88 AK |
135 | gpiod_set_value(ptn_bridge->gpio_rst_n, 0); |
136 | usleep_range(10, 20); | |
137 | gpiod_set_value(ptn_bridge->gpio_rst_n, 1); | |
a9fe713d | 138 | |
5bbb9a2e AK |
139 | if (drm_panel_prepare(ptn_bridge->panel)) { |
140 | DRM_ERROR("failed to prepare panel\n"); | |
141 | return; | |
142 | } | |
143 | ||
a9fe713d SP |
144 | /* |
145 | * There's a bug in the PTN chip where it falsely asserts hotplug before | |
146 | * it is fully functional. We're forced to wait for the maximum start up | |
147 | * time specified in the chip's datasheet to make sure we're really up. | |
148 | */ | |
149 | msleep(90); | |
150 | ||
151 | ret = ptn3460_select_edid(ptn_bridge); | |
152 | if (ret) | |
94d50d57 | 153 | DRM_ERROR("Select EDID failed ret=%d\n", ret); |
a9fe713d SP |
154 | |
155 | ptn_bridge->enabled = true; | |
156 | } | |
157 | ||
158 | static void ptn3460_enable(struct drm_bridge *bridge) | |
159 | { | |
5bbb9a2e AK |
160 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
161 | ||
162 | if (drm_panel_enable(ptn_bridge->panel)) { | |
163 | DRM_ERROR("failed to enable panel\n"); | |
164 | return; | |
165 | } | |
a9fe713d SP |
166 | } |
167 | ||
168 | static void ptn3460_disable(struct drm_bridge *bridge) | |
169 | { | |
94d50d57 | 170 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d SP |
171 | |
172 | if (!ptn_bridge->enabled) | |
173 | return; | |
174 | ||
175 | ptn_bridge->enabled = false; | |
176 | ||
5bbb9a2e AK |
177 | if (drm_panel_disable(ptn_bridge->panel)) { |
178 | DRM_ERROR("failed to disable panel\n"); | |
179 | return; | |
180 | } | |
181 | ||
af478d88 AK |
182 | gpiod_set_value(ptn_bridge->gpio_rst_n, 1); |
183 | gpiod_set_value(ptn_bridge->gpio_pd_n, 0); | |
a9fe713d SP |
184 | } |
185 | ||
186 | static void ptn3460_post_disable(struct drm_bridge *bridge) | |
187 | { | |
5bbb9a2e AK |
188 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
189 | ||
190 | if (drm_panel_unprepare(ptn_bridge->panel)) { | |
191 | DRM_ERROR("failed to unprepare panel\n"); | |
192 | return; | |
193 | } | |
a9fe713d SP |
194 | } |
195 | ||
94d50d57 | 196 | static int ptn3460_get_modes(struct drm_connector *connector) |
a9fe713d SP |
197 | { |
198 | struct ptn3460_bridge *ptn_bridge; | |
199 | u8 *edid; | |
94d50d57 | 200 | int ret, num_modes = 0; |
a9fe713d SP |
201 | bool power_off; |
202 | ||
94d50d57 | 203 | ptn_bridge = connector_to_ptn3460(connector); |
a9fe713d SP |
204 | |
205 | if (ptn_bridge->edid) | |
206 | return drm_add_edid_modes(connector, ptn_bridge->edid); | |
207 | ||
208 | power_off = !ptn_bridge->enabled; | |
94d50d57 | 209 | ptn3460_pre_enable(&ptn_bridge->bridge); |
a9fe713d SP |
210 | |
211 | edid = kmalloc(EDID_LENGTH, GFP_KERNEL); | |
212 | if (!edid) { | |
94d50d57 | 213 | DRM_ERROR("Failed to allocate EDID\n"); |
a9fe713d SP |
214 | return 0; |
215 | } | |
216 | ||
217 | ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid, | |
218 | EDID_LENGTH); | |
219 | if (ret) { | |
220 | kfree(edid); | |
a9fe713d SP |
221 | goto out; |
222 | } | |
223 | ||
224 | ptn_bridge->edid = (struct edid *)edid; | |
c555f023 | 225 | drm_connector_update_edid_property(connector, ptn_bridge->edid); |
a9fe713d SP |
226 | |
227 | num_modes = drm_add_edid_modes(connector, ptn_bridge->edid); | |
228 | ||
229 | out: | |
230 | if (power_off) | |
94d50d57 | 231 | ptn3460_disable(&ptn_bridge->bridge); |
a9fe713d SP |
232 | |
233 | return num_modes; | |
234 | } | |
235 | ||
0aba67c1 | 236 | static const struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = { |
a9fe713d | 237 | .get_modes = ptn3460_get_modes, |
a9fe713d SP |
238 | }; |
239 | ||
0aba67c1 | 240 | static const struct drm_connector_funcs ptn3460_connector_funcs = { |
a9fe713d | 241 | .fill_modes = drm_helper_probe_single_connector_modes, |
bf3b123e | 242 | .destroy = drm_connector_cleanup, |
4ea9526b GP |
243 | .reset = drm_atomic_helper_connector_reset, |
244 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, | |
245 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, | |
a9fe713d SP |
246 | }; |
247 | ||
df1d3069 | 248 | static int ptn3460_bridge_attach(struct drm_bridge *bridge) |
a9fe713d | 249 | { |
6a1688ae | 250 | struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge); |
a9fe713d | 251 | int ret; |
6a1688ae AK |
252 | |
253 | if (!bridge->encoder) { | |
254 | DRM_ERROR("Parent encoder object not found"); | |
255 | return -ENODEV; | |
256 | } | |
257 | ||
a1899953 | 258 | ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD; |
6a1688ae AK |
259 | ret = drm_connector_init(bridge->dev, &ptn_bridge->connector, |
260 | &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS); | |
261 | if (ret) { | |
262 | DRM_ERROR("Failed to initialize connector with drm\n"); | |
263 | return ret; | |
264 | } | |
265 | drm_connector_helper_add(&ptn_bridge->connector, | |
266 | &ptn3460_connector_helper_funcs); | |
267 | drm_connector_register(&ptn_bridge->connector); | |
cde4c44d | 268 | drm_connector_attach_encoder(&ptn_bridge->connector, |
6a1688ae AK |
269 | bridge->encoder); |
270 | ||
5bbb9a2e AK |
271 | if (ptn_bridge->panel) |
272 | drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector); | |
273 | ||
a1899953 AK |
274 | drm_helper_hpd_irq_event(ptn_bridge->connector.dev); |
275 | ||
6a1688ae AK |
276 | return ret; |
277 | } | |
278 | ||
0aba67c1 | 279 | static const struct drm_bridge_funcs ptn3460_bridge_funcs = { |
6a1688ae AK |
280 | .pre_enable = ptn3460_pre_enable, |
281 | .enable = ptn3460_enable, | |
282 | .disable = ptn3460_disable, | |
283 | .post_disable = ptn3460_post_disable, | |
284 | .attach = ptn3460_bridge_attach, | |
285 | }; | |
286 | ||
287 | static int ptn3460_probe(struct i2c_client *client, | |
288 | const struct i2c_device_id *id) | |
289 | { | |
290 | struct device *dev = &client->dev; | |
a9fe713d | 291 | struct ptn3460_bridge *ptn_bridge; |
6a1688ae | 292 | int ret; |
a9fe713d | 293 | |
6a1688ae | 294 | ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL); |
a9fe713d | 295 | if (!ptn_bridge) { |
a9fe713d SP |
296 | return -ENOMEM; |
297 | } | |
298 | ||
ebc94461 RH |
299 | ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL); |
300 | if (ret) | |
301 | return ret; | |
5bbb9a2e | 302 | |
a9fe713d | 303 | ptn_bridge->client = client; |
af478d88 | 304 | |
c06ea0ad UKK |
305 | ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown", |
306 | GPIOD_OUT_HIGH); | |
af478d88 AK |
307 | if (IS_ERR(ptn_bridge->gpio_pd_n)) { |
308 | ret = PTR_ERR(ptn_bridge->gpio_pd_n); | |
309 | dev_err(dev, "cannot get gpio_pd_n %d\n", ret); | |
310 | return ret; | |
a9fe713d SP |
311 | } |
312 | ||
af478d88 AK |
313 | /* |
314 | * Request the reset pin low to avoid the bridge being | |
315 | * initialized prematurely | |
316 | */ | |
c06ea0ad UKK |
317 | ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset", |
318 | GPIOD_OUT_LOW); | |
319 | if (IS_ERR(ptn_bridge->gpio_rst_n)) { | |
320 | ret = PTR_ERR(ptn_bridge->gpio_rst_n); | |
321 | DRM_ERROR("cannot get gpio_rst_n %d\n", ret); | |
af478d88 | 322 | return ret; |
a9fe713d SP |
323 | } |
324 | ||
6a1688ae | 325 | ret = of_property_read_u32(dev->of_node, "edid-emulation", |
a9fe713d SP |
326 | &ptn_bridge->edid_emulation); |
327 | if (ret) { | |
6a1688ae | 328 | dev_err(dev, "Can't read EDID emulation value\n"); |
af478d88 | 329 | return ret; |
a9fe713d SP |
330 | } |
331 | ||
b07b90fd | 332 | ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs; |
5bbb9a2e | 333 | ptn_bridge->bridge.of_node = dev->of_node; |
830dcb44 | 334 | drm_bridge_add(&ptn_bridge->bridge); |
a9fe713d | 335 | |
6a1688ae | 336 | i2c_set_clientdata(client, ptn_bridge); |
a9fe713d SP |
337 | |
338 | return 0; | |
a9fe713d | 339 | } |
3d3f8b1f | 340 | |
6a1688ae | 341 | static int ptn3460_remove(struct i2c_client *client) |
3d3f8b1f | 342 | { |
6a1688ae AK |
343 | struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client); |
344 | ||
345 | drm_bridge_remove(&ptn_bridge->bridge); | |
3d3f8b1f | 346 | |
6a1688ae | 347 | return 0; |
3d3f8b1f | 348 | } |
6a1688ae AK |
349 | |
350 | static const struct i2c_device_id ptn3460_i2c_table[] = { | |
394e5b6d | 351 | {"ptn3460", 0}, |
6a1688ae AK |
352 | {}, |
353 | }; | |
354 | MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table); | |
355 | ||
356 | static const struct of_device_id ptn3460_match[] = { | |
357 | { .compatible = "nxp,ptn3460" }, | |
358 | {}, | |
359 | }; | |
360 | MODULE_DEVICE_TABLE(of, ptn3460_match); | |
361 | ||
362 | static struct i2c_driver ptn3460_driver = { | |
363 | .id_table = ptn3460_i2c_table, | |
364 | .probe = ptn3460_probe, | |
365 | .remove = ptn3460_remove, | |
366 | .driver = { | |
367 | .name = "nxp,ptn3460", | |
6a1688ae AK |
368 | .of_match_table = ptn3460_match, |
369 | }, | |
370 | }; | |
371 | module_i2c_driver(ptn3460_driver); | |
372 | ||
373 | MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>"); | |
374 | MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver"); | |
375 | MODULE_LICENSE("GPL v2"); |