tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2016 Atmel
3 * Bo Shen <voice.shen@atmel.com>
4 *
5 * Authors: Bo Shen <voice.shen@atmel.com>
6 * Boris Brezillon <boris.brezillon@free-electrons.com>
7 * Wu, Songjun <Songjun.Wu@atmel.com>
8 *
9 *
10 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22
23#include <linux/gpio/consumer.h>
24#include <linux/i2c.h>
25#include <linux/module.h>
26#include <linux/regmap.h>
27
28#include <drm/drmP.h>
29#include <drm/drm_atomic_helper.h>
30#include <drm/drm_crtc_helper.h>
31#include <drm/drm_edid.h>
32
33#define SII902X_TPI_VIDEO_DATA 0x0
34
35#define SII902X_TPI_PIXEL_REPETITION 0x8
36#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
37#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
38#define SII902X_TPI_AVI_PIXEL_REP_4X 3
39#define SII902X_TPI_AVI_PIXEL_REP_2X 1
40#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
41#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
42#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
43#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
44#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
45
46#define SII902X_TPI_AVI_IN_FORMAT 0x9
47#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
48#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
49#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
50#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
51#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
52#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
53#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
54#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
55#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
56
57#define SII902X_TPI_AVI_INFOFRAME 0x0c
58
59#define SII902X_SYS_CTRL_DATA 0x1a
60#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
61#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
62#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
63#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
64#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
65#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
66#define SII902X_SYS_CTRL_OUTPUT_DVI 0
67
68#define SII902X_REG_CHIPID(n) (0x1b + (n))
69
70#define SII902X_PWR_STATE_CTRL 0x1e
71#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
72#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
73
74#define SII902X_INT_ENABLE 0x3c
75#define SII902X_INT_STATUS 0x3d
76#define SII902X_HOTPLUG_EVENT BIT(0)
77#define SII902X_PLUGGED_STATUS BIT(2)
78
79#define SII902X_REG_TPI_RQB 0xc7
80
81#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
82
83struct sii902x {
84 struct i2c_client *i2c;
85 struct regmap *regmap;
86 struct drm_bridge bridge;
87 struct drm_connector connector;
88 struct gpio_desc *reset_gpio;
89};
90
91static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
92{
93 return container_of(bridge, struct sii902x, bridge);
94}
95
96static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
97{
98 return container_of(con, struct sii902x, connector);
99}
100
101static void sii902x_reset(struct sii902x *sii902x)
102{
103 if (!sii902x->reset_gpio)
104 return;
105
106 gpiod_set_value(sii902x->reset_gpio, 1);
107
108 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
109 usleep_range(150, 200);
110
111 gpiod_set_value(sii902x->reset_gpio, 0);
112}
113
114static enum drm_connector_status
115sii902x_connector_detect(struct drm_connector *connector, bool force)
116{
117 struct sii902x *sii902x = connector_to_sii902x(connector);
118 unsigned int status;
119
120 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
121
122 return (status & SII902X_PLUGGED_STATUS) ?
123 connector_status_connected : connector_status_disconnected;
124}
125
126static const struct drm_connector_funcs sii902x_connector_funcs = {
127 .detect = sii902x_connector_detect,
128 .fill_modes = drm_helper_probe_single_connector_modes,
129 .destroy = drm_connector_cleanup,
130 .reset = drm_atomic_helper_connector_reset,
131 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
132 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
133};
134
135static int sii902x_get_modes(struct drm_connector *connector)
136{
137 struct sii902x *sii902x = connector_to_sii902x(connector);
138 struct regmap *regmap = sii902x->regmap;
139 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
140 unsigned long timeout;
141 unsigned int status;
142 struct edid *edid;
143 int num = 0;
144 int ret;
145
146 ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
147 SII902X_SYS_CTRL_DDC_BUS_REQ,
148 SII902X_SYS_CTRL_DDC_BUS_REQ);
149 if (ret)
150 return ret;
151
152 timeout = jiffies +
153 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
154 do {
155 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
156 if (ret)
157 return ret;
158 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
159 time_before(jiffies, timeout));
160
161 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
162 dev_err(&sii902x->i2c->dev, "failed to acquire the i2c bus\n");
163 return -ETIMEDOUT;
164 }
165
166 ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
167 if (ret)
168 return ret;
169
170 edid = drm_get_edid(connector, sii902x->i2c->adapter);
171 drm_mode_connector_update_edid_property(connector, edid);
172 if (edid) {
173 num = drm_add_edid_modes(connector, edid);
174 kfree(edid);
175 }
176
177 ret = drm_display_info_set_bus_formats(&connector->display_info,
178 &bus_format, 1);
179 if (ret)
180 return ret;
181
182 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
183 if (ret)
184 return ret;
185
186 ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
187 SII902X_SYS_CTRL_DDC_BUS_REQ |
188 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
189 if (ret)
190 return ret;
191
192 timeout = jiffies +
193 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
194 do {
195 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
196 if (ret)
197 return ret;
198 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
199 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
200 time_before(jiffies, timeout));
201
202 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
203 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
204 dev_err(&sii902x->i2c->dev, "failed to release the i2c bus\n");
205 return -ETIMEDOUT;
206 }
207
208 return num;
209}
210
211static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
212 struct drm_display_mode *mode)
213{
214 /* TODO: check mode */
215
216 return MODE_OK;
217}
218
219static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
220 .get_modes = sii902x_get_modes,
221 .mode_valid = sii902x_mode_valid,
222};
223
224static void sii902x_bridge_disable(struct drm_bridge *bridge)
225{
226 struct sii902x *sii902x = bridge_to_sii902x(bridge);
227
228 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
229 SII902X_SYS_CTRL_PWR_DWN,
230 SII902X_SYS_CTRL_PWR_DWN);
231}
232
233static void sii902x_bridge_enable(struct drm_bridge *bridge)
234{
235 struct sii902x *sii902x = bridge_to_sii902x(bridge);
236
237 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
238 SII902X_AVI_POWER_STATE_MSK,
239 SII902X_AVI_POWER_STATE_D(0));
240 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
241 SII902X_SYS_CTRL_PWR_DWN, 0);
242}
243
244static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
245 struct drm_display_mode *mode,
246 struct drm_display_mode *adj)
247{
248 struct sii902x *sii902x = bridge_to_sii902x(bridge);
249 struct regmap *regmap = sii902x->regmap;
250 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
251 struct hdmi_avi_infoframe frame;
252 int ret;
253
254 buf[0] = adj->clock;
255 buf[1] = adj->clock >> 8;
256 buf[2] = adj->vrefresh;
257 buf[3] = 0x00;
258 buf[4] = adj->hdisplay;
259 buf[5] = adj->hdisplay >> 8;
260 buf[6] = adj->vdisplay;
261 buf[7] = adj->vdisplay >> 8;
262 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
263 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
264 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
265 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
266
267 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
268 if (ret)
269 return;
270
271 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
272 if (ret < 0) {
273 DRM_ERROR("couldn't fill AVI infoframe\n");
274 return;
275 }
276
277 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
278 if (ret < 0) {
279 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
280 return;
281 }
282
283 /* Do not send the infoframe header, but keep the CRC field. */
284 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
285 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
286 HDMI_AVI_INFOFRAME_SIZE + 1);
287}
288
289static int sii902x_bridge_attach(struct drm_bridge *bridge)
290{
291 struct sii902x *sii902x = bridge_to_sii902x(bridge);
292 struct drm_device *drm = bridge->dev;
293 int ret;
294
295 drm_connector_helper_add(&sii902x->connector,
296 &sii902x_connector_helper_funcs);
297
298 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
299 dev_err(&sii902x->i2c->dev,
300 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
301 return -ENOTSUPP;
302 }
303
304 ret = drm_connector_init(drm, &sii902x->connector,
305 &sii902x_connector_funcs,
306 DRM_MODE_CONNECTOR_HDMIA);
307 if (ret)
308 return ret;
309
310 if (sii902x->i2c->irq > 0)
311 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
312 else
313 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
314
315 drm_mode_connector_attach_encoder(&sii902x->connector, bridge->encoder);
316
317 return 0;
318}
319
320static const struct drm_bridge_funcs sii902x_bridge_funcs = {
321 .attach = sii902x_bridge_attach,
322 .mode_set = sii902x_bridge_mode_set,
323 .disable = sii902x_bridge_disable,
324 .enable = sii902x_bridge_enable,
325};
326
327static const struct regmap_range sii902x_volatile_ranges[] = {
328 { .range_min = 0, .range_max = 0xff },
329};
330
331static const struct regmap_access_table sii902x_volatile_table = {
332 .yes_ranges = sii902x_volatile_ranges,
333 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
334};
335
336static const struct regmap_config sii902x_regmap_config = {
337 .reg_bits = 8,
338 .val_bits = 8,
339 .volatile_table = &sii902x_volatile_table,
340 .cache_type = REGCACHE_NONE,
341};
342
343static irqreturn_t sii902x_interrupt(int irq, void *data)
344{
345 struct sii902x *sii902x = data;
346 unsigned int status = 0;
347
348 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
349 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
350
351 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
352 drm_helper_hpd_irq_event(sii902x->bridge.dev);
353
354 return IRQ_HANDLED;
355}
356
357static int sii902x_probe(struct i2c_client *client,
358 const struct i2c_device_id *id)
359{
360 struct device *dev = &client->dev;
361 unsigned int status = 0;
362 struct sii902x *sii902x;
363 u8 chipid[4];
364 int ret;
365
366 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
367 if (!sii902x)
368 return -ENOMEM;
369
370 sii902x->i2c = client;
371 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
372 if (IS_ERR(sii902x->regmap))
373 return PTR_ERR(sii902x->regmap);
374
375 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
376 GPIOD_OUT_LOW);
377 if (IS_ERR(sii902x->reset_gpio)) {
378 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
379 PTR_ERR(sii902x->reset_gpio));
380 return PTR_ERR(sii902x->reset_gpio);
381 }
382
383 sii902x_reset(sii902x);
384
385 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
386 if (ret)
387 return ret;
388
389 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
390 &chipid, 4);
391 if (ret) {
392 dev_err(dev, "regmap_read failed %d\n", ret);
393 return ret;
394 }
395
396 if (chipid[0] != 0xb0) {
397 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
398 chipid[0]);
399 return -EINVAL;
400 }
401
402 /* Clear all pending interrupts */
403 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
404 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
405
406 if (client->irq > 0) {
407 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
408 SII902X_HOTPLUG_EVENT);
409
410 ret = devm_request_threaded_irq(dev, client->irq, NULL,
411 sii902x_interrupt,
412 IRQF_ONESHOT, dev_name(dev),
413 sii902x);
414 if (ret)
415 return ret;
416 }
417
418 sii902x->bridge.funcs = &sii902x_bridge_funcs;
419 sii902x->bridge.of_node = dev->of_node;
420 drm_bridge_add(&sii902x->bridge);
421
422 i2c_set_clientdata(client, sii902x);
423
424 return 0;
425}
426
427static int sii902x_remove(struct i2c_client *client)
428
429{
430 struct sii902x *sii902x = i2c_get_clientdata(client);
431
432 drm_bridge_remove(&sii902x->bridge);
433
434 return 0;
435}
436
437static const struct of_device_id sii902x_dt_ids[] = {
438 { .compatible = "sil,sii9022", },
439 { }
440};
441MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
442
443static const struct i2c_device_id sii902x_i2c_ids[] = {
444 { "sii9022", 0 },
445 { },
446};
447MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
448
449static struct i2c_driver sii902x_driver = {
450 .probe = sii902x_probe,
451 .remove = sii902x_remove,
452 .driver = {
453 .name = "sii902x",
454 .of_match_table = sii902x_dt_ids,
455 },
456 .id_table = sii902x_i2c_ids,
457};
458module_i2c_driver(sii902x_driver);
459
460MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
461MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
462MODULE_LICENSE("GPL");