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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2016 MediaTek Inc.
4 */
5
6#include <linux/delay.h>
7#include <linux/err.h>
8#include <linux/gpio/consumer.h>
9#include <linux/i2c.h>
10#include <linux/module.h>
11#include <linux/of_graph.h>
12#include <linux/regulator/consumer.h>
13
14#include <drm/drm_bridge.h>
15#include <drm/drm_mipi_dsi.h>
16#include <drm/drm_of.h>
17#include <drm/drm_panel.h>
18#include <drm/drm_print.h>
19
20#define PAGE2_GPIO_H 0xa7
21#define PS_GPIO9 BIT(1)
22#define PAGE2_I2C_BYPASS 0xea
23#define I2C_BYPASS_EN 0xd0
24#define PAGE2_MCS_EN 0xf3
25#define MCS_EN BIT(0)
26#define PAGE3_SET_ADD 0xfe
27#define VDO_CTL_ADD 0x13
28#define VDO_DIS 0x18
29#define VDO_EN 0x1c
30#define DP_NUM_LANES 4
31
32/*
33 * PS8640 uses multiple addresses:
34 * page[0]: for DP control
35 * page[1]: for VIDEO Bridge
36 * page[2]: for control top
37 * page[3]: for DSI Link Control1
38 * page[4]: for MIPI Phy
39 * page[5]: for VPLL
40 * page[6]: for DSI Link Control2
41 * page[7]: for SPI ROM mapping
42 */
43enum page_addr_offset {
44 PAGE0_DP_CNTL = 0,
45 PAGE1_VDO_BDG,
46 PAGE2_TOP_CNTL,
47 PAGE3_DSI_CNTL1,
48 PAGE4_MIPI_PHY,
49 PAGE5_VPLL,
50 PAGE6_DSI_CNTL2,
51 PAGE7_SPI_CNTL,
52 MAX_DEVS
53};
54
55enum ps8640_vdo_control {
56 DISABLE = VDO_DIS,
57 ENABLE = VDO_EN,
58};
59
60struct ps8640 {
61 struct drm_bridge bridge;
62 struct drm_bridge *panel_bridge;
63 struct mipi_dsi_device *dsi;
64 struct i2c_client *page[MAX_DEVS];
65 struct regulator_bulk_data supplies[2];
66 struct gpio_desc *gpio_reset;
67 struct gpio_desc *gpio_powerdown;
68 bool powered;
69};
70
71static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
72{
73 return container_of(e, struct ps8640, bridge);
74}
75
76static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
77 const enum ps8640_vdo_control ctrl)
78{
79 struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
80 u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
81 int ret;
82
83 ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
84 sizeof(vdo_ctrl_buf),
85 vdo_ctrl_buf);
86 if (ret < 0) {
87 DRM_ERROR("failed to %sable VDO: %d\n",
88 ctrl == ENABLE ? "en" : "dis", ret);
89 return ret;
90 }
91
92 return 0;
93}
94
95static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
96{
97 struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
98 unsigned long timeout;
99 int ret, status;
100
101 if (ps_bridge->powered)
102 return;
103
104 ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
105 ps_bridge->supplies);
106 if (ret < 0) {
107 DRM_ERROR("cannot enable regulators %d\n", ret);
108 return;
109 }
110
111 gpiod_set_value(ps_bridge->gpio_powerdown, 0);
112 gpiod_set_value(ps_bridge->gpio_reset, 1);
113 usleep_range(2000, 2500);
114 gpiod_set_value(ps_bridge->gpio_reset, 0);
115
116 /*
117 * Wait for the ps8640 embedded MCU to be ready
118 * First wait 200ms and then check the MCU ready flag every 20ms
119 */
120 msleep(200);
121
122 timeout = jiffies + msecs_to_jiffies(200) + 1;
123
124 while (time_is_after_jiffies(timeout)) {
125 status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
126 if (status < 0) {
127 DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
128 goto err_regulators_disable;
129 }
130 if ((status & PS_GPIO9) == PS_GPIO9)
131 break;
132
133 msleep(20);
134 }
135
136 msleep(50);
137
138 /*
139 * The Manufacturer Command Set (MCS) is a device dependent interface
140 * intended for factory programming of the display module default
141 * parameters. Once the display module is configured, the MCS shall be
142 * disabled by the manufacturer. Once disabled, all MCS commands are
143 * ignored by the display interface.
144 */
145 status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
146 if (status < 0) {
147 DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
148 goto err_regulators_disable;
149 }
150
151 ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
152 status & ~MCS_EN);
153 if (ret < 0) {
154 DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
155 goto err_regulators_disable;
156 }
157
158 /* Switch access edp panel's edid through i2c */
159 ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
160 I2C_BYPASS_EN);
161 if (ret < 0) {
162 DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
163 goto err_regulators_disable;
164 }
165
166 ps_bridge->powered = true;
167
168 return;
169
170err_regulators_disable:
171 regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
172 ps_bridge->supplies);
173}
174
175static void ps8640_bridge_poweroff(struct ps8640 *ps_bridge)
176{
177 int ret;
178
179 if (!ps_bridge->powered)
180 return;
181
182 gpiod_set_value(ps_bridge->gpio_reset, 1);
183 gpiod_set_value(ps_bridge->gpio_powerdown, 1);
184 ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
185 ps_bridge->supplies);
186 if (ret < 0)
187 DRM_ERROR("cannot disable regulators %d\n", ret);
188
189 ps_bridge->powered = false;
190}
191
192static void ps8640_pre_enable(struct drm_bridge *bridge)
193{
194 struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
195 int ret;
196
197 ps8640_bridge_poweron(ps_bridge);
198
199 ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
200 if (ret < 0)
201 ps8640_bridge_poweroff(ps_bridge);
202}
203
204static void ps8640_post_disable(struct drm_bridge *bridge)
205{
206 struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
207
208 ps8640_bridge_vdo_control(ps_bridge, DISABLE);
209 ps8640_bridge_poweroff(ps_bridge);
210}
211
212static int ps8640_bridge_attach(struct drm_bridge *bridge,
213 enum drm_bridge_attach_flags flags)
214{
215 struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
216 struct device *dev = &ps_bridge->page[0]->dev;
217 struct device_node *in_ep, *dsi_node;
218 struct mipi_dsi_device *dsi;
219 struct mipi_dsi_host *host;
220 int ret;
221 const struct mipi_dsi_device_info info = { .type = "ps8640",
222 .channel = 0,
223 .node = NULL,
224 };
225
226 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
227 return -EINVAL;
228
229 /* port@0 is ps8640 dsi input port */
230 in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
231 if (!in_ep)
232 return -ENODEV;
233
234 dsi_node = of_graph_get_remote_port_parent(in_ep);
235 of_node_put(in_ep);
236 if (!dsi_node)
237 return -ENODEV;
238
239 host = of_find_mipi_dsi_host_by_node(dsi_node);
240 of_node_put(dsi_node);
241 if (!host)
242 return -ENODEV;
243
244 dsi = mipi_dsi_device_register_full(host, &info);
245 if (IS_ERR(dsi)) {
246 dev_err(dev, "failed to create dsi device\n");
247 ret = PTR_ERR(dsi);
248 return ret;
249 }
250
251 ps_bridge->dsi = dsi;
252
253 dsi->host = host;
254 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
255 MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
256 dsi->format = MIPI_DSI_FMT_RGB888;
257 dsi->lanes = DP_NUM_LANES;
258 ret = mipi_dsi_attach(dsi);
259 if (ret)
260 goto err_dsi_attach;
261
262 /* Attach the panel-bridge to the dsi bridge */
263 return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
264 &ps_bridge->bridge, flags);
265
266err_dsi_attach:
267 mipi_dsi_device_unregister(dsi);
268 return ret;
269}
270
271static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge,
272 struct drm_connector *connector)
273{
274 struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
275 bool poweroff = !ps_bridge->powered;
276 struct edid *edid;
277
278 /*
279 * When we end calling get_edid() triggered by an ioctl, i.e
280 *
281 * drm_mode_getconnector (ioctl)
282 * -> drm_helper_probe_single_connector_modes
283 * -> drm_bridge_connector_get_modes
284 * -> ps8640_bridge_get_edid
285 *
286 * We need to make sure that what we need is enabled before reading
287 * EDID, for this chip, we need to do a full poweron, otherwise it will
288 * fail.
289 */
290 drm_bridge_chain_pre_enable(bridge);
291
292 edid = drm_get_edid(connector,
293 ps_bridge->page[PAGE0_DP_CNTL]->adapter);
294
295 /*
296 * If we call the get_edid() function without having enabled the chip
297 * before, return the chip to its original power state.
298 */
299 if (poweroff)
300 drm_bridge_chain_post_disable(bridge);
301
302 return edid;
303}
304
305static const struct drm_bridge_funcs ps8640_bridge_funcs = {
306 .attach = ps8640_bridge_attach,
307 .get_edid = ps8640_bridge_get_edid,
308 .post_disable = ps8640_post_disable,
309 .pre_enable = ps8640_pre_enable,
310};
311
312static int ps8640_probe(struct i2c_client *client)
313{
314 struct device *dev = &client->dev;
315 struct device_node *np = dev->of_node;
316 struct ps8640 *ps_bridge;
317 struct drm_panel *panel;
318 int ret;
319 u32 i;
320
321 ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
322 if (!ps_bridge)
323 return -ENOMEM;
324
325 /* port@1 is ps8640 output port */
326 ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
327 if (ret < 0)
328 return ret;
329 if (!panel)
330 return -ENODEV;
331
332 ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
333 if (IS_ERR(ps_bridge->panel_bridge))
334 return PTR_ERR(ps_bridge->panel_bridge);
335
336 ps_bridge->supplies[0].supply = "vdd33";
337 ps_bridge->supplies[1].supply = "vdd12";
338 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
339 ps_bridge->supplies);
340 if (ret)
341 return ret;
342
343 ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
344 GPIOD_OUT_HIGH);
345 if (IS_ERR(ps_bridge->gpio_powerdown))
346 return PTR_ERR(ps_bridge->gpio_powerdown);
347
348 /*
349 * Assert the reset to avoid the bridge being initialized prematurely
350 */
351 ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
352 GPIOD_OUT_HIGH);
353 if (IS_ERR(ps_bridge->gpio_reset))
354 return PTR_ERR(ps_bridge->gpio_reset);
355
356 ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
357 ps_bridge->bridge.of_node = dev->of_node;
358 ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
359 ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
360
361 ps_bridge->page[PAGE0_DP_CNTL] = client;
362
363 for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
364 ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
365 client->adapter,
366 client->addr + i);
367 if (IS_ERR(ps_bridge->page[i])) {
368 dev_err(dev, "failed i2c dummy device, address %02x\n",
369 client->addr + i);
370 return PTR_ERR(ps_bridge->page[i]);
371 }
372 }
373
374 i2c_set_clientdata(client, ps_bridge);
375
376 drm_bridge_add(&ps_bridge->bridge);
377
378 return 0;
379}
380
381static int ps8640_remove(struct i2c_client *client)
382{
383 struct ps8640 *ps_bridge = i2c_get_clientdata(client);
384
385 drm_bridge_remove(&ps_bridge->bridge);
386
387 return 0;
388}
389
390static const struct of_device_id ps8640_match[] = {
391 { .compatible = "parade,ps8640" },
392 { }
393};
394MODULE_DEVICE_TABLE(of, ps8640_match);
395
396static struct i2c_driver ps8640_driver = {
397 .probe_new = ps8640_probe,
398 .remove = ps8640_remove,
399 .driver = {
400 .name = "ps8640",
401 .of_match_table = ps8640_match,
402 },
403};
404module_i2c_driver(ps8640_driver);
405
406MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
407MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
408MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>");
409MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
410MODULE_LICENSE("GPL v2");