1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2017 Samsung Electronics 4 * 5 * Authors: 6 * Tomasz Stanislawski <t.stanislaws@samsung.com> 7 * Maciej Purski <m.purski@samsung.com> 8 * 9 * Based on sii9234 driver created by: 10 * Adam Hampson <ahampson@sta.samsung.com> 11 * Erik Gilling <konkers@android.com> 12 * Shankar Bandal <shankar.b@samsung.com> 13 * Dharam Kumar <dharam.kr@samsung.com> 14 */ 15 #include <drm/bridge/mhl.h> 16 #include <drm/drm_bridge.h> 17 #include <drm/drm_crtc.h> 18 #include <drm/drm_edid.h> 19 20 #include <linux/delay.h> 21 #include <linux/err.h> 22 #include <linux/gpio/consumer.h> 23 #include <linux/i2c.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/mutex.h> 29 #include <linux/regulator/consumer.h> 30 #include <linux/slab.h> 31 32 #define CBUS_DEVCAP_OFFSET 0x80 33 34 #define SII9234_MHL_VERSION 0x11 35 #define SII9234_SCRATCHPAD_SIZE 0x10 36 #define SII9234_INT_STAT_SIZE 0x33 37 38 #define BIT_TMDS_CCTRL_TMDS_OE BIT(4) 39 #define MHL_HPD_OUT_OVR_EN BIT(4) 40 #define MHL_HPD_OUT_OVR_VAL BIT(5) 41 #define MHL_INIT_TIMEOUT 0x0C 42 43 /* MHL Tx registers and bits */ 44 #define MHL_TX_SRST 0x05 45 #define MHL_TX_SYSSTAT_REG 0x09 46 #define MHL_TX_INTR1_REG 0x71 47 #define MHL_TX_INTR4_REG 0x74 48 #define MHL_TX_INTR1_ENABLE_REG 0x75 49 #define MHL_TX_INTR4_ENABLE_REG 0x78 50 #define MHL_TX_INT_CTRL_REG 0x79 51 #define MHL_TX_TMDS_CCTRL 0x80 52 #define MHL_TX_DISC_CTRL1_REG 0x90 53 #define MHL_TX_DISC_CTRL2_REG 0x91 54 #define MHL_TX_DISC_CTRL3_REG 0x92 55 #define MHL_TX_DISC_CTRL4_REG 0x93 56 #define MHL_TX_DISC_CTRL5_REG 0x94 57 #define MHL_TX_DISC_CTRL6_REG 0x95 58 #define MHL_TX_DISC_CTRL7_REG 0x96 59 #define MHL_TX_DISC_CTRL8_REG 0x97 60 #define MHL_TX_STAT2_REG 0x99 61 #define MHL_TX_MHLTX_CTL1_REG 0xA0 62 #define MHL_TX_MHLTX_CTL2_REG 0xA1 63 #define MHL_TX_MHLTX_CTL4_REG 0xA3 64 #define MHL_TX_MHLTX_CTL6_REG 0xA5 65 #define MHL_TX_MHLTX_CTL7_REG 0xA6 66 67 #define RSEN_STATUS BIT(2) 68 #define HPD_CHANGE_INT BIT(6) 69 #define RSEN_CHANGE_INT BIT(5) 70 #define RGND_READY_INT BIT(6) 71 #define VBUS_LOW_INT BIT(5) 72 #define CBUS_LKOUT_INT BIT(4) 73 #define MHL_DISC_FAIL_INT BIT(3) 74 #define MHL_EST_INT BIT(2) 75 #define HPD_CHANGE_INT_MASK BIT(6) 76 #define RSEN_CHANGE_INT_MASK BIT(5) 77 78 #define RGND_READY_MASK BIT(6) 79 #define CBUS_LKOUT_MASK BIT(4) 80 #define MHL_DISC_FAIL_MASK BIT(3) 81 #define MHL_EST_MASK BIT(2) 82 83 #define SKIP_GND BIT(6) 84 85 #define ATT_THRESH_SHIFT 0x04 86 #define ATT_THRESH_MASK (0x03 << ATT_THRESH_SHIFT) 87 #define USB_D_OEN BIT(3) 88 #define DEGLITCH_TIME_MASK 0x07 89 #define DEGLITCH_TIME_2MS 0 90 #define DEGLITCH_TIME_4MS 1 91 #define DEGLITCH_TIME_8MS 2 92 #define DEGLITCH_TIME_16MS 3 93 #define DEGLITCH_TIME_40MS 4 94 #define DEGLITCH_TIME_50MS 5 95 #define DEGLITCH_TIME_60MS 6 96 #define DEGLITCH_TIME_128MS 7 97 98 #define USB_D_OVR BIT(7) 99 #define USB_ID_OVR BIT(6) 100 #define DVRFLT_SEL BIT(5) 101 #define BLOCK_RGND_INT BIT(4) 102 #define SKIP_DEG BIT(3) 103 #define CI2CA_POL BIT(2) 104 #define CI2CA_WKUP BIT(1) 105 #define SINGLE_ATT BIT(0) 106 107 #define USB_D_ODN BIT(5) 108 #define VBUS_CHECK BIT(2) 109 #define RGND_INTP_MASK 0x03 110 #define RGND_INTP_OPEN 0 111 #define RGND_INTP_2K 1 112 #define RGND_INTP_1K 2 113 #define RGND_INTP_SHORT 3 114 115 /* HDMI registers */ 116 #define HDMI_RX_TMDS0_CCTRL1_REG 0x10 117 #define HDMI_RX_TMDS_CLK_EN_REG 0x11 118 #define HDMI_RX_TMDS_CH_EN_REG 0x12 119 #define HDMI_RX_PLL_CALREFSEL_REG 0x17 120 #define HDMI_RX_PLL_VCOCAL_REG 0x1A 121 #define HDMI_RX_EQ_DATA0_REG 0x22 122 #define HDMI_RX_EQ_DATA1_REG 0x23 123 #define HDMI_RX_EQ_DATA2_REG 0x24 124 #define HDMI_RX_EQ_DATA3_REG 0x25 125 #define HDMI_RX_EQ_DATA4_REG 0x26 126 #define HDMI_RX_TMDS_ZONE_CTRL_REG 0x4C 127 #define HDMI_RX_TMDS_MODE_CTRL_REG 0x4D 128 129 /* CBUS registers */ 130 #define CBUS_INT_STATUS_1_REG 0x08 131 #define CBUS_INTR1_ENABLE_REG 0x09 132 #define CBUS_MSC_REQ_ABORT_REASON_REG 0x0D 133 #define CBUS_INT_STATUS_2_REG 0x1E 134 #define CBUS_INTR2_ENABLE_REG 0x1F 135 #define CBUS_LINK_CONTROL_2_REG 0x31 136 #define CBUS_MHL_STATUS_REG_0 0xB0 137 #define CBUS_MHL_STATUS_REG_1 0xB1 138 139 #define BIT_CBUS_RESET BIT(3) 140 #define SET_HPD_DOWNSTREAM BIT(6) 141 142 /* TPI registers */ 143 #define TPI_DPD_REG 0x3D 144 145 /* Timeouts in msec */ 146 #define T_SRC_VBUS_CBUS_TO_STABLE 200 147 #define T_SRC_CBUS_FLOAT 100 148 #define T_SRC_CBUS_DEGLITCH 2 149 #define T_SRC_RXSENSE_DEGLITCH 110 150 151 #define MHL1_MAX_CLK 75000 /* in kHz */ 152 153 #define I2C_TPI_ADDR 0x3D 154 #define I2C_HDMI_ADDR 0x49 155 #define I2C_CBUS_ADDR 0x64 156 157 enum sii9234_state { 158 ST_OFF, 159 ST_D3, 160 ST_RGND_INIT, 161 ST_RGND_1K, 162 ST_RSEN_HIGH, 163 ST_MHL_ESTABLISHED, 164 ST_FAILURE_DISCOVERY, 165 ST_FAILURE, 166 }; 167 168 struct sii9234 { 169 struct i2c_client *client[4]; 170 struct drm_bridge bridge; 171 struct device *dev; 172 struct gpio_desc *gpio_reset; 173 int i2c_error; 174 struct regulator_bulk_data supplies[4]; 175 176 struct mutex lock; /* Protects fields below and device registers */ 177 enum sii9234_state state; 178 }; 179 180 enum sii9234_client_id { 181 I2C_MHL, 182 I2C_TPI, 183 I2C_HDMI, 184 I2C_CBUS, 185 }; 186 187 static const char * const sii9234_client_name[] = { 188 [I2C_MHL] = "MHL", 189 [I2C_TPI] = "TPI", 190 [I2C_HDMI] = "HDMI", 191 [I2C_CBUS] = "CBUS", 192 }; 193 194 static int sii9234_writeb(struct sii9234 *ctx, int id, int offset, 195 int value) 196 { 197 int ret; 198 struct i2c_client *client = ctx->client[id]; 199 200 if (ctx->i2c_error) 201 return ctx->i2c_error; 202 203 ret = i2c_smbus_write_byte_data(client, offset, value); 204 if (ret < 0) 205 dev_err(ctx->dev, "writeb: %4s[0x%02x] <- 0x%02x\n", 206 sii9234_client_name[id], offset, value); 207 ctx->i2c_error = ret; 208 209 return ret; 210 } 211 212 static int sii9234_writebm(struct sii9234 *ctx, int id, int offset, 213 int value, int mask) 214 { 215 int ret; 216 struct i2c_client *client = ctx->client[id]; 217 218 if (ctx->i2c_error) 219 return ctx->i2c_error; 220 221 ret = i2c_smbus_write_byte(client, offset); 222 if (ret < 0) { 223 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n", 224 sii9234_client_name[id], offset, value); 225 ctx->i2c_error = ret; 226 return ret; 227 } 228 229 ret = i2c_smbus_read_byte(client); 230 if (ret < 0) { 231 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n", 232 sii9234_client_name[id], offset, value); 233 ctx->i2c_error = ret; 234 return ret; 235 } 236 237 value = (value & mask) | (ret & ~mask); 238 239 ret = i2c_smbus_write_byte_data(client, offset, value); 240 if (ret < 0) { 241 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n", 242 sii9234_client_name[id], offset, value); 243 ctx->i2c_error = ret; 244 } 245 246 return ret; 247 } 248 249 static int sii9234_readb(struct sii9234 *ctx, int id, int offset) 250 { 251 int ret; 252 struct i2c_client *client = ctx->client[id]; 253 254 if (ctx->i2c_error) 255 return ctx->i2c_error; 256 257 ret = i2c_smbus_write_byte(client, offset); 258 if (ret < 0) { 259 dev_err(ctx->dev, "readb: %4s[0x%02x]\n", 260 sii9234_client_name[id], offset); 261 ctx->i2c_error = ret; 262 return ret; 263 } 264 265 ret = i2c_smbus_read_byte(client); 266 if (ret < 0) { 267 dev_err(ctx->dev, "readb: %4s[0x%02x]\n", 268 sii9234_client_name[id], offset); 269 ctx->i2c_error = ret; 270 } 271 272 return ret; 273 } 274 275 static int sii9234_clear_error(struct sii9234 *ctx) 276 { 277 int ret = ctx->i2c_error; 278 279 ctx->i2c_error = 0; 280 281 return ret; 282 } 283 284 #define mhl_tx_writeb(sii9234, offset, value) \ 285 sii9234_writeb(sii9234, I2C_MHL, offset, value) 286 #define mhl_tx_writebm(sii9234, offset, value, mask) \ 287 sii9234_writebm(sii9234, I2C_MHL, offset, value, mask) 288 #define mhl_tx_readb(sii9234, offset) \ 289 sii9234_readb(sii9234, I2C_MHL, offset) 290 #define cbus_writeb(sii9234, offset, value) \ 291 sii9234_writeb(sii9234, I2C_CBUS, offset, value) 292 #define cbus_writebm(sii9234, offset, value, mask) \ 293 sii9234_writebm(sii9234, I2C_CBUS, offset, value, mask) 294 #define cbus_readb(sii9234, offset) \ 295 sii9234_readb(sii9234, I2C_CBUS, offset) 296 #define hdmi_writeb(sii9234, offset, value) \ 297 sii9234_writeb(sii9234, I2C_HDMI, offset, value) 298 #define hdmi_writebm(sii9234, offset, value, mask) \ 299 sii9234_writebm(sii9234, I2C_HDMI, offset, value, mask) 300 #define hdmi_readb(sii9234, offset) \ 301 sii9234_readb(sii9234, I2C_HDMI, offset) 302 #define tpi_writeb(sii9234, offset, value) \ 303 sii9234_writeb(sii9234, I2C_TPI, offset, value) 304 #define tpi_writebm(sii9234, offset, value, mask) \ 305 sii9234_writebm(sii9234, I2C_TPI, offset, value, mask) 306 #define tpi_readb(sii9234, offset) \ 307 sii9234_readb(sii9234, I2C_TPI, offset) 308 309 static u8 sii9234_tmds_control(struct sii9234 *ctx, bool enable) 310 { 311 mhl_tx_writebm(ctx, MHL_TX_TMDS_CCTRL, enable ? ~0 : 0, 312 BIT_TMDS_CCTRL_TMDS_OE); 313 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0, 314 MHL_HPD_OUT_OVR_EN | MHL_HPD_OUT_OVR_VAL); 315 return sii9234_clear_error(ctx); 316 } 317 318 static int sii9234_cbus_reset(struct sii9234 *ctx) 319 { 320 int i; 321 322 mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, BIT_CBUS_RESET); 323 msleep(T_SRC_CBUS_DEGLITCH); 324 mhl_tx_writebm(ctx, MHL_TX_SRST, 0, BIT_CBUS_RESET); 325 326 for (i = 0; i < 4; i++) { 327 /* 328 * Enable WRITE_STAT interrupt for writes to all 329 * 4 MSC Status registers. 330 */ 331 cbus_writeb(ctx, 0xE0 + i, 0xF2); 332 /* 333 * Enable SET_INT interrupt for writes to all 334 * 4 MSC Interrupt registers. 335 */ 336 cbus_writeb(ctx, 0xF0 + i, 0xF2); 337 } 338 339 return sii9234_clear_error(ctx); 340 } 341 342 /* Require to chek mhl imformation of samsung in cbus_init_register */ 343 static int sii9234_cbus_init(struct sii9234 *ctx) 344 { 345 cbus_writeb(ctx, 0x07, 0xF2); 346 cbus_writeb(ctx, 0x40, 0x03); 347 cbus_writeb(ctx, 0x42, 0x06); 348 cbus_writeb(ctx, 0x36, 0x0C); 349 cbus_writeb(ctx, 0x3D, 0xFD); 350 cbus_writeb(ctx, 0x1C, 0x01); 351 cbus_writeb(ctx, 0x1D, 0x0F); 352 cbus_writeb(ctx, 0x44, 0x02); 353 /* Setup our devcap */ 354 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEV_STATE, 0x00); 355 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_MHL_VERSION, 356 SII9234_MHL_VERSION); 357 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_CAT, 358 MHL_DCAP_CAT_SOURCE); 359 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_H, 0x01); 360 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_L, 0x41); 361 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VID_LINK_MODE, 362 MHL_DCAP_VID_LINK_RGB444 | MHL_DCAP_VID_LINK_YCBCR444); 363 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VIDEO_TYPE, 364 MHL_DCAP_VT_GRAPHICS); 365 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_LOG_DEV_MAP, 366 MHL_DCAP_LD_GUI); 367 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_BANDWIDTH, 0x0F); 368 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_FEATURE_FLAG, 369 MHL_DCAP_FEATURE_RCP_SUPPORT | MHL_DCAP_FEATURE_RAP_SUPPORT 370 | MHL_DCAP_FEATURE_SP_SUPPORT); 371 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_H, 0x0); 372 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_L, 0x0); 373 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_SCRATCHPAD_SIZE, 374 SII9234_SCRATCHPAD_SIZE); 375 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_INT_STAT_SIZE, 376 SII9234_INT_STAT_SIZE); 377 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_RESERVED, 0); 378 cbus_writebm(ctx, 0x31, 0x0C, 0x0C); 379 cbus_writeb(ctx, 0x30, 0x01); 380 cbus_writebm(ctx, 0x3C, 0x30, 0x38); 381 cbus_writebm(ctx, 0x22, 0x0D, 0x0F); 382 cbus_writebm(ctx, 0x2E, 0x15, 0x15); 383 cbus_writeb(ctx, CBUS_INTR1_ENABLE_REG, 0); 384 cbus_writeb(ctx, CBUS_INTR2_ENABLE_REG, 0); 385 386 return sii9234_clear_error(ctx); 387 } 388 389 static void force_usb_id_switch_open(struct sii9234 *ctx) 390 { 391 /* Disable CBUS discovery */ 392 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0, 0x01); 393 /* Force USB ID switch to open */ 394 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR); 395 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86); 396 /* Force upstream HPD to 0 when not in MHL mode. */ 397 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x30); 398 } 399 400 static void release_usb_id_switch_open(struct sii9234 *ctx) 401 { 402 msleep(T_SRC_CBUS_FLOAT); 403 /* Clear USB ID switch to open */ 404 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR); 405 /* Enable CBUS discovery */ 406 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 0x01); 407 } 408 409 static int sii9234_power_init(struct sii9234 *ctx) 410 { 411 /* Force the SiI9234 into the D0 state. */ 412 tpi_writeb(ctx, TPI_DPD_REG, 0x3F); 413 /* Enable TxPLL Clock */ 414 hdmi_writeb(ctx, HDMI_RX_TMDS_CLK_EN_REG, 0x01); 415 /* Enable Tx Clock Path & Equalizer */ 416 hdmi_writeb(ctx, HDMI_RX_TMDS_CH_EN_REG, 0x15); 417 /* Power Up TMDS */ 418 mhl_tx_writeb(ctx, 0x08, 0x35); 419 return sii9234_clear_error(ctx); 420 } 421 422 static int sii9234_hdmi_init(struct sii9234 *ctx) 423 { 424 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1); 425 hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03); 426 hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20); 427 hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A); 428 hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A); 429 hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA); 430 hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA); 431 hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA); 432 hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0); 433 hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00); 434 mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34); 435 hdmi_writeb(ctx, 0x45, 0x44); 436 hdmi_writeb(ctx, 0x31, 0x0A); 437 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1); 438 439 return sii9234_clear_error(ctx); 440 } 441 442 static int sii9234_mhl_tx_ctl_int(struct sii9234 *ctx) 443 { 444 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0xD0); 445 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL2_REG, 0xFC); 446 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL4_REG, 0xEB); 447 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL7_REG, 0x0C); 448 449 return sii9234_clear_error(ctx); 450 } 451 452 static int sii9234_reset(struct sii9234 *ctx) 453 { 454 int ret; 455 456 sii9234_clear_error(ctx); 457 458 ret = sii9234_power_init(ctx); 459 if (ret < 0) 460 return ret; 461 ret = sii9234_cbus_reset(ctx); 462 if (ret < 0) 463 return ret; 464 ret = sii9234_hdmi_init(ctx); 465 if (ret < 0) 466 return ret; 467 ret = sii9234_mhl_tx_ctl_int(ctx); 468 if (ret < 0) 469 return ret; 470 471 /* Enable HDCP Compliance safety */ 472 mhl_tx_writeb(ctx, 0x2B, 0x01); 473 /* CBUS discovery cycle time for each drive and float = 150us */ 474 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0x04, 0x06); 475 /* Clear bit 6 (reg_skip_rgnd) */ 476 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL2_REG, (1 << 7) /* Reserved */ 477 | 2 << ATT_THRESH_SHIFT | DEGLITCH_TIME_50MS); 478 /* 479 * Changed from 66 to 65 for 94[1:0] = 01 = 5k reg_cbusmhl_pup_sel 480 * 1.8V CBUS VTH & GND threshold 481 * to meet CTS 3.3.7.2 spec 482 */ 483 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77); 484 cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, MHL_INIT_TIMEOUT); 485 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL6_REG, 0xA0); 486 /* RGND & single discovery attempt (RGND blocking) */ 487 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL6_REG, BLOCK_RGND_INT | 488 DVRFLT_SEL | SINGLE_ATT); 489 /* Use VBUS path of discovery state machine */ 490 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL8_REG, 0); 491 /* 0x92[3] sets the CBUS / ID switch */ 492 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR); 493 /* 494 * To allow RGND engine to operate correctly. 495 * When moving the chip from D2 to D0 (power up, init regs) 496 * the values should be 497 * 94[1:0] = 01 reg_cbusmhl_pup_sel[1:0] should be set for 5k 498 * 93[7:6] = 10 reg_cbusdisc_pup_sel[1:0] should be 499 * set for 10k (default) 500 * 93[5:4] = 00 reg_cbusidle_pup_sel[1:0] = open (default) 501 */ 502 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86); 503 /* 504 * Change from CC to 8C to match 5K 505 * to meet CTS 3.3.72 spec 506 */ 507 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C); 508 /* Configure the interrupt as active high */ 509 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x06); 510 511 msleep(25); 512 513 /* Release usb_id switch */ 514 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR); 515 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL1_REG, 0x27); 516 517 ret = sii9234_clear_error(ctx); 518 if (ret < 0) 519 return ret; 520 ret = sii9234_cbus_init(ctx); 521 if (ret < 0) 522 return ret; 523 524 /* Enable Auto soft reset on SCDT = 0 */ 525 mhl_tx_writeb(ctx, 0x05, 0x04); 526 /* HDMI Transcode mode enable */ 527 mhl_tx_writeb(ctx, 0x0D, 0x1C); 528 mhl_tx_writeb(ctx, MHL_TX_INTR4_ENABLE_REG, 529 RGND_READY_MASK | CBUS_LKOUT_MASK 530 | MHL_DISC_FAIL_MASK | MHL_EST_MASK); 531 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 0x60); 532 533 /* This point is very important before measure RGND impedance */ 534 force_usb_id_switch_open(ctx); 535 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, 0, 0xF0); 536 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL5_REG, 0, 0x03); 537 release_usb_id_switch_open(ctx); 538 539 /* Force upstream HPD to 0 when not in MHL mode */ 540 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 1 << 5); 541 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, ~0, 1 << 4); 542 543 return sii9234_clear_error(ctx); 544 } 545 546 static int sii9234_goto_d3(struct sii9234 *ctx) 547 { 548 int ret; 549 550 dev_dbg(ctx->dev, "sii9234: detection started d3\n"); 551 552 ret = sii9234_reset(ctx); 553 if (ret < 0) 554 goto exit; 555 556 hdmi_writeb(ctx, 0x01, 0x03); 557 tpi_writebm(ctx, TPI_DPD_REG, 0, 1); 558 /* I2C above is expected to fail because power goes down */ 559 sii9234_clear_error(ctx); 560 561 ctx->state = ST_D3; 562 563 return 0; 564 exit: 565 dev_err(ctx->dev, "%s failed\n", __func__); 566 return -1; 567 } 568 569 static int sii9234_hw_on(struct sii9234 *ctx) 570 { 571 return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 572 } 573 574 static void sii9234_hw_off(struct sii9234 *ctx) 575 { 576 gpiod_set_value(ctx->gpio_reset, 1); 577 msleep(20); 578 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 579 } 580 581 static void sii9234_hw_reset(struct sii9234 *ctx) 582 { 583 gpiod_set_value(ctx->gpio_reset, 1); 584 msleep(20); 585 gpiod_set_value(ctx->gpio_reset, 0); 586 } 587 588 static void sii9234_cable_in(struct sii9234 *ctx) 589 { 590 int ret; 591 592 mutex_lock(&ctx->lock); 593 if (ctx->state != ST_OFF) 594 goto unlock; 595 ret = sii9234_hw_on(ctx); 596 if (ret < 0) 597 goto unlock; 598 599 sii9234_hw_reset(ctx); 600 sii9234_goto_d3(ctx); 601 /* To avoid irq storm, when hw is in meta state */ 602 enable_irq(to_i2c_client(ctx->dev)->irq); 603 604 unlock: 605 mutex_unlock(&ctx->lock); 606 } 607 608 static void sii9234_cable_out(struct sii9234 *ctx) 609 { 610 mutex_lock(&ctx->lock); 611 612 if (ctx->state == ST_OFF) 613 goto unlock; 614 615 disable_irq(to_i2c_client(ctx->dev)->irq); 616 tpi_writeb(ctx, TPI_DPD_REG, 0); 617 /* Turn on&off hpd festure for only QCT HDMI */ 618 sii9234_hw_off(ctx); 619 620 ctx->state = ST_OFF; 621 622 unlock: 623 mutex_unlock(&ctx->lock); 624 } 625 626 static enum sii9234_state sii9234_rgnd_ready_irq(struct sii9234 *ctx) 627 { 628 int value; 629 630 if (ctx->state == ST_D3) { 631 int ret; 632 633 dev_dbg(ctx->dev, "RGND_READY_INT\n"); 634 sii9234_hw_reset(ctx); 635 636 ret = sii9234_reset(ctx); 637 if (ret < 0) { 638 dev_err(ctx->dev, "sii9234_reset() failed\n"); 639 return ST_FAILURE; 640 } 641 642 return ST_RGND_INIT; 643 } 644 645 /* Got interrupt in inappropriate state */ 646 if (ctx->state != ST_RGND_INIT) 647 return ST_FAILURE; 648 649 value = mhl_tx_readb(ctx, MHL_TX_STAT2_REG); 650 if (sii9234_clear_error(ctx)) 651 return ST_FAILURE; 652 653 if ((value & RGND_INTP_MASK) != RGND_INTP_1K) { 654 dev_warn(ctx->dev, "RGND is not 1k\n"); 655 return ST_RGND_INIT; 656 } 657 dev_dbg(ctx->dev, "RGND 1K!!\n"); 658 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C); 659 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77); 660 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, 0x05); 661 if (sii9234_clear_error(ctx)) 662 return ST_FAILURE; 663 664 msleep(T_SRC_VBUS_CBUS_TO_STABLE); 665 return ST_RGND_1K; 666 } 667 668 static enum sii9234_state sii9234_mhl_established(struct sii9234 *ctx) 669 { 670 dev_dbg(ctx->dev, "mhl est interrupt\n"); 671 672 /* Discovery override */ 673 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0x10); 674 /* Increase DDC translation layer timer (byte mode) */ 675 cbus_writeb(ctx, 0x07, 0x32); 676 cbus_writebm(ctx, 0x44, ~0, 1 << 1); 677 /* Keep the discovery enabled. Need RGND interrupt */ 678 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 1); 679 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 680 RSEN_CHANGE_INT_MASK | HPD_CHANGE_INT_MASK); 681 682 if (sii9234_clear_error(ctx)) 683 return ST_FAILURE; 684 685 return ST_MHL_ESTABLISHED; 686 } 687 688 static enum sii9234_state sii9234_hpd_change(struct sii9234 *ctx) 689 { 690 int value; 691 692 value = cbus_readb(ctx, CBUS_MSC_REQ_ABORT_REASON_REG); 693 if (sii9234_clear_error(ctx)) 694 return ST_FAILURE; 695 696 if (value & SET_HPD_DOWNSTREAM) { 697 /* Downstream HPD High, Enable TMDS */ 698 sii9234_tmds_control(ctx, true); 699 } else { 700 /* Downstream HPD Low, Disable TMDS */ 701 sii9234_tmds_control(ctx, false); 702 } 703 704 return ctx->state; 705 } 706 707 static enum sii9234_state sii9234_rsen_change(struct sii9234 *ctx) 708 { 709 int value; 710 711 /* Work_around code to handle wrong interrupt */ 712 if (ctx->state != ST_RGND_1K) { 713 dev_err(ctx->dev, "RSEN_HIGH without RGND_1K\n"); 714 return ST_FAILURE; 715 } 716 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG); 717 if (value < 0) 718 return ST_FAILURE; 719 720 if (value & RSEN_STATUS) { 721 dev_dbg(ctx->dev, "MHL cable connected.. RSEN High\n"); 722 return ST_RSEN_HIGH; 723 } 724 dev_dbg(ctx->dev, "RSEN lost\n"); 725 /* 726 * Once RSEN loss is confirmed,we need to check 727 * based on cable status and chip power status,whether 728 * it is SINK Loss(HDMI cable not connected, TV Off) 729 * or MHL cable disconnection 730 * TODO: Define the below mhl_disconnection() 731 */ 732 msleep(T_SRC_RXSENSE_DEGLITCH); 733 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG); 734 if (value < 0) 735 return ST_FAILURE; 736 dev_dbg(ctx->dev, "sys_stat: %x\n", value); 737 738 if (value & RSEN_STATUS) { 739 dev_dbg(ctx->dev, "RSEN recovery\n"); 740 return ST_RSEN_HIGH; 741 } 742 dev_dbg(ctx->dev, "RSEN Really LOW\n"); 743 /* To meet CTS 3.3.22.2 spec */ 744 sii9234_tmds_control(ctx, false); 745 force_usb_id_switch_open(ctx); 746 release_usb_id_switch_open(ctx); 747 748 return ST_FAILURE; 749 } 750 751 static irqreturn_t sii9234_irq_thread(int irq, void *data) 752 { 753 struct sii9234 *ctx = data; 754 int intr1, intr4; 755 int intr1_en, intr4_en; 756 int cbus_intr1, cbus_intr2; 757 758 dev_dbg(ctx->dev, "%s\n", __func__); 759 760 mutex_lock(&ctx->lock); 761 762 intr1 = mhl_tx_readb(ctx, MHL_TX_INTR1_REG); 763 intr4 = mhl_tx_readb(ctx, MHL_TX_INTR4_REG); 764 intr1_en = mhl_tx_readb(ctx, MHL_TX_INTR1_ENABLE_REG); 765 intr4_en = mhl_tx_readb(ctx, MHL_TX_INTR4_ENABLE_REG); 766 cbus_intr1 = cbus_readb(ctx, CBUS_INT_STATUS_1_REG); 767 cbus_intr2 = cbus_readb(ctx, CBUS_INT_STATUS_2_REG); 768 769 if (sii9234_clear_error(ctx)) 770 goto done; 771 772 dev_dbg(ctx->dev, "irq %02x/%02x %02x/%02x %02x/%02x\n", 773 intr1, intr1_en, intr4, intr4_en, cbus_intr1, cbus_intr2); 774 775 if (intr4 & RGND_READY_INT) 776 ctx->state = sii9234_rgnd_ready_irq(ctx); 777 if (intr1 & RSEN_CHANGE_INT) 778 ctx->state = sii9234_rsen_change(ctx); 779 if (intr4 & MHL_EST_INT) 780 ctx->state = sii9234_mhl_established(ctx); 781 if (intr1 & HPD_CHANGE_INT) 782 ctx->state = sii9234_hpd_change(ctx); 783 if (intr4 & CBUS_LKOUT_INT) 784 ctx->state = ST_FAILURE; 785 if (intr4 & MHL_DISC_FAIL_INT) 786 ctx->state = ST_FAILURE_DISCOVERY; 787 788 done: 789 /* Clean interrupt status and pending flags */ 790 mhl_tx_writeb(ctx, MHL_TX_INTR1_REG, intr1); 791 mhl_tx_writeb(ctx, MHL_TX_INTR4_REG, intr4); 792 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_0, 0xFF); 793 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_1, 0xFF); 794 cbus_writeb(ctx, CBUS_INT_STATUS_1_REG, cbus_intr1); 795 cbus_writeb(ctx, CBUS_INT_STATUS_2_REG, cbus_intr2); 796 797 sii9234_clear_error(ctx); 798 799 if (ctx->state == ST_FAILURE) { 800 dev_dbg(ctx->dev, "try to reset after failure\n"); 801 sii9234_hw_reset(ctx); 802 sii9234_goto_d3(ctx); 803 } 804 805 if (ctx->state == ST_FAILURE_DISCOVERY) { 806 dev_err(ctx->dev, "discovery failed, no power for MHL?\n"); 807 tpi_writebm(ctx, TPI_DPD_REG, 0, 1); 808 ctx->state = ST_D3; 809 } 810 811 mutex_unlock(&ctx->lock); 812 813 return IRQ_HANDLED; 814 } 815 816 static int sii9234_init_resources(struct sii9234 *ctx, 817 struct i2c_client *client) 818 { 819 struct i2c_adapter *adapter = client->adapter; 820 int ret; 821 822 if (!ctx->dev->of_node) { 823 dev_err(ctx->dev, "not DT device\n"); 824 return -ENODEV; 825 } 826 827 ctx->gpio_reset = devm_gpiod_get(ctx->dev, "reset", GPIOD_OUT_LOW); 828 if (IS_ERR(ctx->gpio_reset)) { 829 dev_err(ctx->dev, "failed to get reset gpio from DT\n"); 830 return PTR_ERR(ctx->gpio_reset); 831 } 832 833 ctx->supplies[0].supply = "avcc12"; 834 ctx->supplies[1].supply = "avcc33"; 835 ctx->supplies[2].supply = "iovcc18"; 836 ctx->supplies[3].supply = "cvcc12"; 837 ret = devm_regulator_bulk_get(ctx->dev, 4, ctx->supplies); 838 if (ret) { 839 if (ret != -EPROBE_DEFER) 840 dev_err(ctx->dev, "regulator_bulk failed\n"); 841 return ret; 842 } 843 844 ctx->client[I2C_MHL] = client; 845 846 ctx->client[I2C_TPI] = devm_i2c_new_dummy_device(&client->dev, adapter, 847 I2C_TPI_ADDR); 848 if (IS_ERR(ctx->client[I2C_TPI])) { 849 dev_err(ctx->dev, "failed to create TPI client\n"); 850 return PTR_ERR(ctx->client[I2C_TPI]); 851 } 852 853 ctx->client[I2C_HDMI] = devm_i2c_new_dummy_device(&client->dev, adapter, 854 I2C_HDMI_ADDR); 855 if (IS_ERR(ctx->client[I2C_HDMI])) { 856 dev_err(ctx->dev, "failed to create HDMI RX client\n"); 857 return PTR_ERR(ctx->client[I2C_HDMI]); 858 } 859 860 ctx->client[I2C_CBUS] = devm_i2c_new_dummy_device(&client->dev, adapter, 861 I2C_CBUS_ADDR); 862 if (IS_ERR(ctx->client[I2C_CBUS])) { 863 dev_err(ctx->dev, "failed to create CBUS client\n"); 864 return PTR_ERR(ctx->client[I2C_CBUS]); 865 } 866 867 return 0; 868 } 869 870 static inline struct sii9234 *bridge_to_sii9234(struct drm_bridge *bridge) 871 { 872 return container_of(bridge, struct sii9234, bridge); 873 } 874 875 static enum drm_mode_status sii9234_mode_valid(struct drm_bridge *bridge, 876 const struct drm_display_info *info, 877 const struct drm_display_mode *mode) 878 { 879 if (mode->clock > MHL1_MAX_CLK) 880 return MODE_CLOCK_HIGH; 881 882 return MODE_OK; 883 } 884 885 static const struct drm_bridge_funcs sii9234_bridge_funcs = { 886 .mode_valid = sii9234_mode_valid, 887 }; 888 889 static int sii9234_probe(struct i2c_client *client, 890 const struct i2c_device_id *id) 891 { 892 struct i2c_adapter *adapter = client->adapter; 893 struct sii9234 *ctx; 894 struct device *dev = &client->dev; 895 int ret; 896 897 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 898 if (!ctx) 899 return -ENOMEM; 900 901 ctx->dev = dev; 902 mutex_init(&ctx->lock); 903 904 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 905 dev_err(dev, "I2C adapter lacks SMBUS feature\n"); 906 return -EIO; 907 } 908 909 if (!client->irq) { 910 dev_err(dev, "no irq provided\n"); 911 return -EINVAL; 912 } 913 914 irq_set_status_flags(client->irq, IRQ_NOAUTOEN); 915 ret = devm_request_threaded_irq(dev, client->irq, NULL, 916 sii9234_irq_thread, 917 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 918 "sii9234", ctx); 919 if (ret < 0) { 920 dev_err(dev, "failed to install IRQ handler\n"); 921 return ret; 922 } 923 924 ret = sii9234_init_resources(ctx, client); 925 if (ret < 0) 926 return ret; 927 928 i2c_set_clientdata(client, ctx); 929 930 ctx->bridge.funcs = &sii9234_bridge_funcs; 931 ctx->bridge.of_node = dev->of_node; 932 drm_bridge_add(&ctx->bridge); 933 934 sii9234_cable_in(ctx); 935 936 return 0; 937 } 938 939 static int sii9234_remove(struct i2c_client *client) 940 { 941 struct sii9234 *ctx = i2c_get_clientdata(client); 942 943 sii9234_cable_out(ctx); 944 drm_bridge_remove(&ctx->bridge); 945 946 return 0; 947 } 948 949 static const struct of_device_id sii9234_dt_match[] = { 950 { .compatible = "sil,sii9234" }, 951 { }, 952 }; 953 MODULE_DEVICE_TABLE(of, sii9234_dt_match); 954 955 static const struct i2c_device_id sii9234_id[] = { 956 { "SII9234", 0 }, 957 { }, 958 }; 959 MODULE_DEVICE_TABLE(i2c, sii9234_id); 960 961 static struct i2c_driver sii9234_driver = { 962 .driver = { 963 .name = "sii9234", 964 .of_match_table = sii9234_dt_match, 965 }, 966 .probe = sii9234_probe, 967 .remove = sii9234_remove, 968 .id_table = sii9234_id, 969 }; 970 971 module_i2c_driver(sii9234_driver); 972 MODULE_LICENSE("GPL"); 973