git.infradead.org Git - nvme.git/blob - drivers/gpu/drm/bridge/sii902x.c

1 // SPDX-License-Identifier: GPL-2.0-or-later

2 /*

4 *

6 * Bo Shen <voice.shen@atmel.com>

7 *

8 * Authors: Bo Shen <voice.shen@atmel.com>

9 * Boris Brezillon <boris.brezillon@free-electrons.com>

10 * Wu, Songjun <Songjun.Wu@atmel.com>

11 *

13 */

14

15 #include <linux/gpio/consumer.h>

16 #include <linux/i2c-mux.h>

17 #include <linux/i2c.h>

18 #include <linux/media-bus-format.h>

19 #include <linux/module.h>

20 #include <linux/regmap.h>

21 #include <linux/regulator/consumer.h>

22 #include <linux/clk.h>

23

24 #include <drm/drm_atomic_helper.h>

25 #include <drm/drm_bridge.h>

26 #include <drm/drm_drv.h>

27 #include <drm/drm_edid.h>

28 #include <drm/drm_print.h>

29 #include <drm/drm_probe_helper.h>

30

31 #include <sound/hdmi-codec.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 /* Audio */

75 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f

76 #define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0)

77 #define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0)

78 #define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0)

79 #define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0)

80 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2)

81 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3)

82 #define SII902X_TPI_I2S_SELECT_SD0 (0 << 4)

83 #define SII902X_TPI_I2S_SELECT_SD1 (1 << 4)

84 #define SII902X_TPI_I2S_SELECT_SD2 (2 << 4)

85 #define SII902X_TPI_I2S_SELECT_SD3 (3 << 4)

86 #define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7)

87

88 #define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20

89 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0)

90 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0)

91 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1)

92 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1)

93 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2)

94 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2)

95 #define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3)

96 #define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3)

97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4)

98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4)

99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4)

100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4)

101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4)

102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4)

103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4)

104 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4)

105 #define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7)

106 #define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7)

107

108 #define SII902X_TPI_I2S_STRM_HDR_BASE 0x21

109 #define SII902X_TPI_I2S_STRM_HDR_SIZE 5

110

111 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26

112 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0)

113 #define SII902X_TPI_AUDIO_CODING_PCM (1 << 0)

114 #define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0)

115 #define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0)

116 #define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0)

117 #define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0)

118 #define SII902X_TPI_AUDIO_CODING_AAC (6 << 0)

119 #define SII902X_TPI_AUDIO_CODING_DTS (7 << 0)

120 #define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0)

121 #define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4)

122 #define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4)

123 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5)

124 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5)

125 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6)

126 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6)

127 #define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6)

128

129 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27

130 #define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3)

131 #define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3)

132 #define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3)

133 #define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3)

134 #define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3)

135 #define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3)

136 #define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3)

137 #define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3)

138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6)

139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6)

140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6)

141 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6)

142

143 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28

144

145 #define SII902X_INT_ENABLE 0x3c

146 #define SII902X_INT_STATUS 0x3d

147 #define SII902X_HOTPLUG_EVENT BIT(0)

148 #define SII902X_PLUGGED_STATUS BIT(2)

149

150 #define SII902X_REG_TPI_RQB 0xc7

151

152 /* Indirect internal register access */

153 #define SII902X_IND_SET_PAGE 0xbc

154 #define SII902X_IND_OFFSET 0xbd

155 #define SII902X_IND_VALUE 0xbe

156

157 #define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf

158 #define SII902X_TPI_MISC_INFOFRAME_END 0xde

159 #define SII902X_TPI_MISC_INFOFRAME_SIZE \

160 (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)

161

162 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500

163

164 #define SII902X_AUDIO_PORT_INDEX 3

165

166 struct sii902x {

167 struct i2c_client *i2c;

168 struct regmap *regmap;

169 struct drm_bridge bridge;

170 struct drm_bridge *next_bridge;

171 struct drm_connector connector;

172 struct gpio_desc *reset_gpio;

173 struct i2c_mux_core *i2cmux;

174 bool sink_is_hdmi;

175 /*

176 * Mutex protects audio and video functions from interfering

177 * each other, by keeping their i2c command sequences atomic.

178 */

179 struct mutex mutex;

180 struct sii902x_audio {

181 struct platform_device *pdev;

182 struct clk *mclk;

183 u32 i2s_fifo_sequence[4];

184 } audio;

185 };

186

187 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)

188 {

189 union i2c_smbus_data data;

190 int ret;

191

192 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,

193 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);

194

195 if (ret < 0)

196 return ret;

197

198 *val = data.byte;

199 return 0;

200 }

201

202 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)

203 {

204 union i2c_smbus_data data;

205

206 data.byte = val;

207

208 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,

209 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,

210 &data);

211 }

212

213 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,

214 u8 val)

215 {

216 int ret;

217 u8 status;

218

219 ret = sii902x_read_unlocked(i2c, reg, &status);

220 if (ret)

221 return ret;

222 status &= ~mask;

223 status |= val & mask;

224 return sii902x_write_unlocked(i2c, reg, status);

225 }

226

227 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)

228 {

229 return container_of(bridge, struct sii902x, bridge);

230 }

231

232 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)

233 {

234 return container_of(con, struct sii902x, connector);

235 }

236

237 static void sii902x_reset(struct sii902x *sii902x)

238 {

239 if (!sii902x->reset_gpio)

240 return;

241

242 gpiod_set_value_cansleep(sii902x->reset_gpio, 1);

243

244 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */

245 usleep_range(150, 200);

246

247 gpiod_set_value_cansleep(sii902x->reset_gpio, 0);

248 }

249

250 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)

251 {

252 unsigned int status;

253

254 mutex_lock(&sii902x->mutex);

255

256 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);

257

258 mutex_unlock(&sii902x->mutex);

259

260 return (status & SII902X_PLUGGED_STATUS) ?

261 connector_status_connected : connector_status_disconnected;

262 }

263

264 static enum drm_connector_status

265 sii902x_connector_detect(struct drm_connector *connector, bool force)

266 {

267 struct sii902x *sii902x = connector_to_sii902x(connector);

268

269 return sii902x_detect(sii902x);

270 }

271

272 static const struct drm_connector_funcs sii902x_connector_funcs = {

273 .detect = sii902x_connector_detect,

274 .fill_modes = drm_helper_probe_single_connector_modes,

275 .destroy = drm_connector_cleanup,

276 .reset = drm_atomic_helper_connector_reset,

277 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,

278 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,

279 };

280

281 static struct edid *sii902x_get_edid(struct sii902x *sii902x,

282 struct drm_connector *connector)

283 {

284 struct edid *edid;

285

286 mutex_lock(&sii902x->mutex);

287

288 edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);

289 if (edid) {

290 if (drm_detect_hdmi_monitor(edid))

291 sii902x->sink_is_hdmi = true;

292 else

293 sii902x->sink_is_hdmi = false;

294 }

295

296 mutex_unlock(&sii902x->mutex);

297

298 return edid;

299 }

300

301 static int sii902x_get_modes(struct drm_connector *connector)

302 {

303 struct sii902x *sii902x = connector_to_sii902x(connector);

304 struct edid *edid;

305 int num = 0;

306

307 edid = sii902x_get_edid(sii902x, connector);

308 drm_connector_update_edid_property(connector, edid);

309 if (edid) {

310 num = drm_add_edid_modes(connector, edid);

311 kfree(edid);

312 }

313

314 return num;

315 }

316

317 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,

318 struct drm_display_mode *mode)

319 {

320 /* TODO: check mode */

321

322 return MODE_OK;

323 }

324

325 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {

326 .get_modes = sii902x_get_modes,

327 .mode_valid = sii902x_mode_valid,

328 };

329

330 static void sii902x_bridge_disable(struct drm_bridge *bridge)

331 {

332 struct sii902x *sii902x = bridge_to_sii902x(bridge);

333

334 mutex_lock(&sii902x->mutex);

335

336 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,

337 SII902X_SYS_CTRL_PWR_DWN,

338 SII902X_SYS_CTRL_PWR_DWN);

339

340 mutex_unlock(&sii902x->mutex);

341 }

342

343 static void sii902x_bridge_enable(struct drm_bridge *bridge)

344 {

345 struct sii902x *sii902x = bridge_to_sii902x(bridge);

346

347 mutex_lock(&sii902x->mutex);

348

349 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,

350 SII902X_AVI_POWER_STATE_MSK,

351 SII902X_AVI_POWER_STATE_D(0));

352 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,

353 SII902X_SYS_CTRL_PWR_DWN, 0);

354

355 mutex_unlock(&sii902x->mutex);

356 }

357

358 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,

359 const struct drm_display_mode *mode,

360 const struct drm_display_mode *adj)

361 {

362 struct sii902x *sii902x = bridge_to_sii902x(bridge);

363 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;

364 struct regmap *regmap = sii902x->regmap;

365 u8 buf[HDMI_INFOFRAME_SIZE(AVI)];

366 struct hdmi_avi_infoframe frame;

367 u16 pixel_clock_10kHz = adj->clock / 10;

368 int ret;

369

370 if (sii902x->sink_is_hdmi)

371 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;

372

373 buf[0] = pixel_clock_10kHz & 0xff;

374 buf[1] = pixel_clock_10kHz >> 8;

375 buf[2] = drm_mode_vrefresh(adj);

376 buf[3] = 0x00;

377 buf[4] = adj->hdisplay;

378 buf[5] = adj->hdisplay >> 8;

379 buf[6] = adj->vdisplay;

380 buf[7] = adj->vdisplay >> 8;

381 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |

382 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;

383 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |

384 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;

385

386 mutex_lock(&sii902x->mutex);

387

388 ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,

389 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);

390 if (ret)

391 goto out;

392

393 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);

394 if (ret)

395 goto out;

396

397 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,

398 &sii902x->connector, adj);

399 if (ret < 0) {

400 DRM_ERROR("couldn't fill AVI infoframe\n");

401 goto out;

402 }

403

404 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));

405 if (ret < 0) {

406 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);

407 goto out;

408 }

409

410 /* Do not send the infoframe header, but keep the CRC field. */

411 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,

412 buf + HDMI_INFOFRAME_HEADER_SIZE - 1,

413 HDMI_AVI_INFOFRAME_SIZE + 1);

414

415 out:

416 mutex_unlock(&sii902x->mutex);

417 }

418

419 static int sii902x_bridge_attach(struct drm_bridge *bridge,

420 enum drm_bridge_attach_flags flags)

421 {

422 struct sii902x *sii902x = bridge_to_sii902x(bridge);

423 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;

424 struct drm_device *drm = bridge->dev;

425 int ret;

426

427 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)

428 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,

429 bridge, flags);

430

431 drm_connector_helper_add(&sii902x->connector,

432 &sii902x_connector_helper_funcs);

433

434 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {

435 dev_err(&sii902x->i2c->dev,

436 "sii902x driver is only compatible with DRM devices supporting atomic updates\n");

437 return -ENOTSUPP;

438 }

439

440 ret = drm_connector_init(drm, &sii902x->connector,

441 &sii902x_connector_funcs,

442 DRM_MODE_CONNECTOR_HDMIA);

443 if (ret)

444 return ret;

445

446 if (sii902x->i2c->irq > 0)

447 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;

448 else

449 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;

450

451 ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,

452 &bus_format, 1);

453 if (ret)

454 return ret;

455

456 drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);

457

458 return 0;

459 }

460

461 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)

462 {

463 struct sii902x *sii902x = bridge_to_sii902x(bridge);

464

465 return sii902x_detect(sii902x);

466 }

467

468 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge,

469 struct drm_connector *connector)

470 {

471 struct sii902x *sii902x = bridge_to_sii902x(bridge);

472

473 return sii902x_get_edid(sii902x, connector);

474 }

475

476 static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,

477 struct drm_bridge_state *bridge_state,

478 struct drm_crtc_state *crtc_state,

479 struct drm_connector_state *conn_state,

480 u32 output_fmt,

481 unsigned int *num_input_fmts)

482 {

483 u32 *input_fmts;

484

485 *num_input_fmts = 0;

486

487 input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);

488 if (!input_fmts)

489 return NULL;

490

491 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;

492 *num_input_fmts = 1;

493

494 return input_fmts;

495 }

496

497 static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,

498 struct drm_bridge_state *bridge_state,

499 struct drm_crtc_state *crtc_state,

500 struct drm_connector_state *conn_state)

501 {

502 /*

503 * There might be flags negotiation supported in future but

504 * set the bus flags in atomic_check statically for now.

505 */

506 bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;

507

508 return 0;

509 }

510

511 static const struct drm_bridge_funcs sii902x_bridge_funcs = {

512 .attach = sii902x_bridge_attach,

513 .mode_set = sii902x_bridge_mode_set,

514 .disable = sii902x_bridge_disable,

515 .enable = sii902x_bridge_enable,

516 .detect = sii902x_bridge_detect,

517 .get_edid = sii902x_bridge_get_edid,

518 .atomic_reset = drm_atomic_helper_bridge_reset,

519 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,

520 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,

521 .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,

522 .atomic_check = sii902x_bridge_atomic_check,

523 };

524

525 static int sii902x_mute(struct sii902x *sii902x, bool mute)

526 {

527 struct device *dev = &sii902x->i2c->dev;

528 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :

529 SII902X_TPI_AUDIO_MUTE_DISABLE;

530

531 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");

532

533 return regmap_update_bits(sii902x->regmap,

534 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,

535 SII902X_TPI_AUDIO_MUTE_ENABLE, val);

536 }

537

538 static const int sii902x_mclk_div_table[] = {

539 128, 256, 384, 512, 768, 1024, 1152, 192 };

540

541 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,

542 unsigned int mclk)

543 {

544 int div = mclk / rate;

545 int distance = 100000;

546 u8 i, nearest = 0;

547

548 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {

549 unsigned int d = abs(div - sii902x_mclk_div_table[i]);

550

551 if (d >= distance)

552 continue;

553

554 nearest = i;

555 distance = d;

556 if (d == 0)

557 break;

558 }

559

560 *i2s_config_reg |= nearest << 4;

561

562 return sii902x_mclk_div_table[nearest];

563 }

564

565 static const struct sii902x_sample_freq {

566 u32 freq;

567 u8 val;

568 } sii902x_sample_freq[] = {

569 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ },

570 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ },

571 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ },

572 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ },

573 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ },

574 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ },

575 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ },

576 };

577

578 static int sii902x_audio_hw_params(struct device *dev, void *data,

579 struct hdmi_codec_daifmt *daifmt,

580 struct hdmi_codec_params *params)

581 {

582 struct sii902x *sii902x = dev_get_drvdata(dev);

583 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;

584 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |

585 SII902X_TPI_AUDIO_MUTE_ENABLE |

586 SII902X_TPI_AUDIO_CODING_PCM);

587 u8 config_byte3_reg = 0;

588 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];

589 unsigned long mclk_rate;

590 int i, ret;

591

592 if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {

593 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",

594 __func__);

595 return -EINVAL;

596 }

597

598 switch (daifmt->fmt) {

599 case HDMI_I2S:

600 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |

601 SII902X_TPI_I2S_SD_JUSTIFY_LEFT;

602 break;

603 case HDMI_RIGHT_J:

604 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;

605 break;

606 case HDMI_LEFT_J:

607 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;

608 break;

609 default:

610 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,

611 daifmt->fmt);

612 return -EINVAL;

613 }

614

615 if (daifmt->bit_clk_inv)

616 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;

617 else

618 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;

619

620 if (daifmt->frame_clk_inv)

621 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;

622 else

623 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;

624

625 if (params->channels > 2)

626 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;

627 else

628 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;

629

630 switch (params->sample_width) {

631 case 16:

632 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;

633 break;

634 case 20:

635 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;

636 break;

637 case 24:

638 case 32:

639 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;

640 break;

641 default:

642 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,

643 params->sample_width);

644 return -EINVAL;

645 }

646

647 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {

648 if (params->sample_rate == sii902x_sample_freq[i].freq) {

649 config_byte3_reg |= sii902x_sample_freq[i].val;

650 break;

651 }

652 }

653

654 ret = clk_prepare_enable(sii902x->audio.mclk);

655 if (ret) {

656 dev_err(dev, "Enabling mclk failed: %d\n", ret);

657 return ret;

658 }

659

660 if (sii902x->audio.mclk) {

661 mclk_rate = clk_get_rate(sii902x->audio.mclk);

662 ret = sii902x_select_mclk_div(&i2s_config_reg,

663 params->sample_rate, mclk_rate);

664 if (mclk_rate != ret * params->sample_rate)

665 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",

666 mclk_rate, ret, params->sample_rate);

667 }

668

669 mutex_lock(&sii902x->mutex);

670

671 ret = regmap_write(sii902x->regmap,

672 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,

673 config_byte2_reg);

674 if (ret < 0)

675 goto out;

676

677 ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,

678 i2s_config_reg);

679 if (ret)

680 goto out;

681

682 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&

683 sii902x->audio.i2s_fifo_sequence[i]; i++)

684 regmap_write(sii902x->regmap,

685 SII902X_TPI_I2S_ENABLE_MAPPING_REG,

686 sii902x->audio.i2s_fifo_sequence[i]);

687

688 ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,

689 config_byte3_reg);

690 if (ret)

691 goto out;

692

693 ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,

694 params->iec.status,

695 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,

696 sizeof(params->iec.status)));

697 if (ret)

698 goto out;

699

700 ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,

701 sizeof(infoframe_buf));

702 if (ret < 0) {

703 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",

704 __func__, ret);

705 goto out;

706 }

707

708 ret = regmap_bulk_write(sii902x->regmap,

709 SII902X_TPI_MISC_INFOFRAME_BASE,

710 infoframe_buf,

711 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));

712 if (ret)

713 goto out;

714

715 /* Decode Level 0 Packets */

716 ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);

717 if (ret)

718 goto out;

719

720 ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);

721 if (ret)

722 goto out;

723

724 ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);

725 if (ret)

726 goto out;

727

728 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);

729 out:

730 mutex_unlock(&sii902x->mutex);

731

732 if (ret) {

733 clk_disable_unprepare(sii902x->audio.mclk);

734 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,

735 ret);

736 }

737

738 return ret;

739 }

740

741 static void sii902x_audio_shutdown(struct device *dev, void *data)

742 {

743 struct sii902x *sii902x = dev_get_drvdata(dev);

744

745 mutex_lock(&sii902x->mutex);

746

747 regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,

748 SII902X_TPI_AUDIO_INTERFACE_DISABLE);

749

750 mutex_unlock(&sii902x->mutex);

751

752 clk_disable_unprepare(sii902x->audio.mclk);

753 }

754

755 static int sii902x_audio_mute(struct device *dev, void *data,

756 bool enable, int direction)

757 {

758 struct sii902x *sii902x = dev_get_drvdata(dev);

759

760 mutex_lock(&sii902x->mutex);

761

762 sii902x_mute(sii902x, enable);

763

764 mutex_unlock(&sii902x->mutex);

765

766 return 0;

767 }

768

769 static int sii902x_audio_get_eld(struct device *dev, void *data,

770 uint8_t *buf, size_t len)

771 {

772 struct sii902x *sii902x = dev_get_drvdata(dev);

773

774 mutex_lock(&sii902x->mutex);

775

776 memcpy(buf, sii902x->connector.eld,

777 min(sizeof(sii902x->connector.eld), len));

778

779 mutex_unlock(&sii902x->mutex);

780

781 return 0;

782 }

783

784 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,

785 struct device_node *endpoint)

786 {

787 struct of_endpoint of_ep;

788 int ret;

789

790 ret = of_graph_parse_endpoint(endpoint, &of_ep);

791 if (ret < 0)

792 return ret;

793

794 /*

795 * HDMI sound should be located at reg = <3>

796 * Return expected DAI index 0.

797 */

798 if (of_ep.port == SII902X_AUDIO_PORT_INDEX)

799 return 0;

800

801 return -EINVAL;

802 }

803

804 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {

805 .hw_params = sii902x_audio_hw_params,

806 .audio_shutdown = sii902x_audio_shutdown,

807 .mute_stream = sii902x_audio_mute,

808 .get_eld = sii902x_audio_get_eld,

809 .get_dai_id = sii902x_audio_get_dai_id,

810 .no_capture_mute = 1,

811 };

812

813 static int sii902x_audio_codec_init(struct sii902x *sii902x,

814 struct device *dev)

815 {

816 static const u8 audio_fifo_id[] = {

817 SII902X_TPI_I2S_CONFIG_FIFO0,

818 SII902X_TPI_I2S_CONFIG_FIFO1,

819 SII902X_TPI_I2S_CONFIG_FIFO2,

820 SII902X_TPI_I2S_CONFIG_FIFO3,

821 };

822 static const u8 i2s_lane_id[] = {

823 SII902X_TPI_I2S_SELECT_SD0,

824 SII902X_TPI_I2S_SELECT_SD1,

825 SII902X_TPI_I2S_SELECT_SD2,

826 SII902X_TPI_I2S_SELECT_SD3,

827 };

828 struct hdmi_codec_pdata codec_data = {

829 .ops = &sii902x_audio_codec_ops,

830 .i2s = 1, /* Only i2s support for now. */

831 .spdif = 0,

832 .max_i2s_channels = 0,

833 };

834 u8 lanes[4];

835 int num_lanes, i;

836

837 if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {

838 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",

839 __func__);

840 return 0;

841 }

842

843 num_lanes = of_property_read_variable_u8_array(dev->of_node,

844 "sil,i2s-data-lanes",

845 lanes, 1,

846 ARRAY_SIZE(lanes));

847

848 if (num_lanes == -EINVAL) {

849 dev_dbg(dev,

850 "%s: No \"sil,i2s-data-lanes\", use default <0>\n",

851 __func__);

852 num_lanes = 1;

853 lanes[0] = 0;

854 } else if (num_lanes < 0) {

855 dev_err(dev,

856 "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",

857 __func__, num_lanes);

858 return num_lanes;

859 }

860 codec_data.max_i2s_channels = 2 * num_lanes;

861

862 for (i = 0; i < num_lanes; i++)

863 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |

864 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;

865

866 sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");

867 if (IS_ERR(sii902x->audio.mclk)) {

868 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",

869 __func__, PTR_ERR(sii902x->audio.mclk));

870 return PTR_ERR(sii902x->audio.mclk);

871 }

872

873 sii902x->audio.pdev = platform_device_register_data(

874 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,

875 &codec_data, sizeof(codec_data));

876

877 return PTR_ERR_OR_ZERO(sii902x->audio.pdev);

878 }

879

880 static const struct regmap_range sii902x_volatile_ranges[] = {

881 { .range_min = 0, .range_max = 0xff },

882 };

883

884 static const struct regmap_access_table sii902x_volatile_table = {

885 .yes_ranges = sii902x_volatile_ranges,

886 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),

887 };

888

889 static const struct regmap_config sii902x_regmap_config = {

890 .reg_bits = 8,

891 .val_bits = 8,

892 .disable_locking = true, /* struct sii902x mutex should be enough */

893 .max_register = SII902X_TPI_MISC_INFOFRAME_END,

894 .volatile_table = &sii902x_volatile_table,

895 .cache_type = REGCACHE_NONE,

896 };

897

898 static irqreturn_t sii902x_interrupt(int irq, void *data)

899 {

900 struct sii902x *sii902x = data;

901 unsigned int status = 0;

902

903 mutex_lock(&sii902x->mutex);

904

905 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);

906 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);

907

908 mutex_unlock(&sii902x->mutex);

909

910 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {

911 drm_helper_hpd_irq_event(sii902x->bridge.dev);

912 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)

913 ? connector_status_connected

914 : connector_status_disconnected);

915 }

916

917 return IRQ_HANDLED;

918 }

919

920 /*

921 * The purpose of sii902x_i2c_bypass_select is to enable the pass through

922 * mode of the HDMI transmitter. Do not use regmap from within this function,

923 * only use sii902x_*_unlocked functions to read/modify/write registers.

924 * We are holding the parent adapter lock here, keep this in mind before

925 * adding more i2c transactions.

926 *

927 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere

928 * in this driver, we need to make sure that we only touch 0x1A[2:1] from

929 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that

930 * we leave the remaining bits as we have found them.

931 */

932 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)

933 {

934 struct sii902x *sii902x = i2c_mux_priv(mux);

935 struct device *dev = &sii902x->i2c->dev;

936 unsigned long timeout;

937 u8 status;

938 int ret;

939

940 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

941 SII902X_SYS_CTRL_DDC_BUS_REQ,

942 SII902X_SYS_CTRL_DDC_BUS_REQ);

943 if (ret)

944 return ret;

945

946 timeout = jiffies +

947 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);

948 do {

949 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

950 &status);

951 if (ret)

952 return ret;

953 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&

954 time_before(jiffies, timeout));

955

956 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {

957 dev_err(dev, "Failed to acquire the i2c bus\n");

958 return -ETIMEDOUT;

959 }

960

961 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

962 status);

963 }

964

965 /*

966 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through

967 * mode of the HDMI transmitter. Do not use regmap from within this function,

968 * only use sii902x_*_unlocked functions to read/modify/write registers.

969 * We are holding the parent adapter lock here, keep this in mind before

970 * adding more i2c transactions.

971 *

972 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere

973 * in this driver, we need to make sure that we only touch 0x1A[2:1] from

974 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that

975 * we leave the remaining bits as we have found them.

976 */

977 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)

978 {

979 struct sii902x *sii902x = i2c_mux_priv(mux);

980 struct device *dev = &sii902x->i2c->dev;

981 unsigned long timeout;

982 unsigned int retries;

983 u8 status;

984 int ret;

985

986 /*

987 * When the HDMI transmitter is in pass through mode, we need an

988 * (undocumented) additional delay between STOP and START conditions

989 * to guarantee the bus won't get stuck.

990 */

991 udelay(30);

992

993 /*

994 * Sometimes the I2C bus can stall after failure to use the

995 * EDID channel. Retry a few times to see if things clear

996 * up, else continue anyway.

997 */

998 retries = 5;

999 do {

1000 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

1001 &status);

1002 retries--;

1003 } while (ret && retries);

1004 if (ret) {

1005 dev_err(dev, "failed to read status (%d)\n", ret);

1006 return ret;

1007 }

1008

1009 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

1010 SII902X_SYS_CTRL_DDC_BUS_REQ |

1011 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);

1012 if (ret)

1013 return ret;

1014

1015 timeout = jiffies +

1016 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);

1017 do {

1018 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,

1019 &status);

1020 if (ret)

1021 return ret;

1022 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |

1023 SII902X_SYS_CTRL_DDC_BUS_GRTD) &&

1024 time_before(jiffies, timeout));

1025

1026 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |

1027 SII902X_SYS_CTRL_DDC_BUS_GRTD)) {

1028 dev_err(dev, "failed to release the i2c bus\n");

1029 return -ETIMEDOUT;

1030 }

1031

1032 return 0;

1033 }

1034

1035 static const struct drm_bridge_timings default_sii902x_timings = {

1036 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE

1037 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE

1038 | DRM_BUS_FLAG_DE_HIGH,

1039 };

1040

1041 static int sii902x_init(struct sii902x *sii902x)

1042 {

1043 struct device *dev = &sii902x->i2c->dev;

1044 unsigned int status = 0;

1045 u8 chipid[4];

1046 int ret;

1047

1048 sii902x_reset(sii902x);

1049

1050 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);

1051 if (ret)

1052 return ret;

1053

1054 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),

1055 &chipid, 4);

1056 if (ret) {

1057 dev_err(dev, "regmap_read failed %d\n", ret);

1058 return ret;

1059 }

1060

1061 if (chipid[0] != 0xb0) {

1062 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",

1063 chipid[0]);

1064 return -EINVAL;

1065 }

1066

1067 /* Clear all pending interrupts */

1068 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);

1069 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);

1070

1071 if (sii902x->i2c->irq > 0) {

1072 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,

1073 SII902X_HOTPLUG_EVENT);

1074

1075 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,

1076 sii902x_interrupt,

1077 IRQF_ONESHOT, dev_name(dev),

1078 sii902x);

1079 if (ret)

1080 return ret;

1081 }

1082

1083 sii902x->bridge.funcs = &sii902x_bridge_funcs;

1084 sii902x->bridge.of_node = dev->of_node;

1085 sii902x->bridge.timings = &default_sii902x_timings;

1086 sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;

1087

1088 if (sii902x->i2c->irq > 0)

1089 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;

1090

1091 drm_bridge_add(&sii902x->bridge);

1092

1093 sii902x_audio_codec_init(sii902x, dev);

1094

1095 i2c_set_clientdata(sii902x->i2c, sii902x);

1096

1097 sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,

1098 1, 0, I2C_MUX_GATE,

1099 sii902x_i2c_bypass_select,

1100 sii902x_i2c_bypass_deselect);

1101 if (!sii902x->i2cmux)

1102 return -ENOMEM;

1103

1104 sii902x->i2cmux->priv = sii902x;

1105 return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);

1106 }

1107

1108 static int sii902x_probe(struct i2c_client *client)

1109 {

1110 struct device *dev = &client->dev;

1111 struct device_node *endpoint;

1112 struct sii902x *sii902x;

1113 static const char * const supplies[] = {"iovcc", "cvcc12"};

1114 int ret;

1115

1116 ret = i2c_check_functionality(client->adapter,

1117 I2C_FUNC_SMBUS_BYTE_DATA);

1118 if (!ret) {

1119 dev_err(dev, "I2C adapter not suitable\n");

1120 return -EIO;

1121 }

1122

1123 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);

1124 if (!sii902x)

1125 return -ENOMEM;

1126

1127 sii902x->i2c = client;

1128 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);

1129 if (IS_ERR(sii902x->regmap))

1130 return PTR_ERR(sii902x->regmap);

1131

1132 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",

1133 GPIOD_OUT_LOW);

1134 if (IS_ERR(sii902x->reset_gpio)) {

1135 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",

1136 PTR_ERR(sii902x->reset_gpio));

1137 return PTR_ERR(sii902x->reset_gpio);

1138 }

1139

1140 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);

1141 if (endpoint) {

1142 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);

1143

1144 of_node_put(endpoint);

1145 if (!remote) {

1146 dev_err(dev, "Endpoint in port@1 unconnected\n");

1147 return -ENODEV;

1148 }

1149

1150 if (!of_device_is_available(remote)) {

1151 dev_err(dev, "port@1 remote device is disabled\n");

1152 of_node_put(remote);

1153 return -ENODEV;

1154 }

1155

1156 sii902x->next_bridge = of_drm_find_bridge(remote);

1157 of_node_put(remote);

1158 if (!sii902x->next_bridge)

1159 return dev_err_probe(dev, -EPROBE_DEFER,

1160 "Failed to find remote bridge\n");

1161 }

1162

1163 mutex_init(&sii902x->mutex);

1164

1165 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);

1166 if (ret < 0)

1167 return dev_err_probe(dev, ret, "Failed to enable supplies");

1168

1169 return sii902x_init(sii902x);

1170 }

1171

1172 static void sii902x_remove(struct i2c_client *client)

1173

1174 {

1175 struct sii902x *sii902x = i2c_get_clientdata(client);

1176

1177 i2c_mux_del_adapters(sii902x->i2cmux);

1178 drm_bridge_remove(&sii902x->bridge);

1179 }

1180

1181 static const struct of_device_id sii902x_dt_ids[] = {

1182 { .compatible = "sil,sii9022", },

1183 { }

1184 };

1185 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);

1186

1187 static const struct i2c_device_id sii902x_i2c_ids[] = {

1188 { "sii9022", 0 },

1189 { },

1190 };

1191 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);

1192

1193 static struct i2c_driver sii902x_driver = {

1194 .probe = sii902x_probe,

1195 .remove = sii902x_remove,

1196 .driver = {

1197 .name = "sii902x",

1198 .of_match_table = sii902x_dt_ids,

1199 },

1200 .id_table = sii902x_i2c_ids,

1201 };

1202 module_i2c_driver(sii902x_driver);

1203

1204 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");

1205 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");

1206 MODULE_LICENSE("GPL");