1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * TC358775 DSI to LVDS bridge driver 4 * 5 * Copyright (C) 2020 SMART Wireless Computing 6 * Author: Vinay Simha BN <simhavcs@gmail.com> 7 * 8 */ 9 /* #define DEBUG */ 10 #include <linux/bitfield.h> 11 #include <linux/clk.h> 12 #include <linux/device.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/i2c.h> 15 #include <linux/kernel.h> 16 #include <linux/media-bus-format.h> 17 #include <linux/module.h> 18 #include <linux/of_device.h> 19 #include <linux/regulator/consumer.h> 20 #include <linux/slab.h> 21 22 #include <asm/unaligned.h> 23 24 #include <drm/display/drm_dp_helper.h> 25 #include <drm/drm_atomic_helper.h> 26 #include <drm/drm_bridge.h> 27 #include <drm/drm_mipi_dsi.h> 28 #include <drm/drm_of.h> 29 #include <drm/drm_panel.h> 30 #include <drm/drm_probe_helper.h> 31 32 #define FLD_VAL(val, start, end) FIELD_PREP(GENMASK(start, end), val) 33 34 /* Registers */ 35 36 /* DSI D-PHY Layer Registers */ 37 #define D0W_DPHYCONTTX 0x0004 /* Data Lane 0 DPHY Tx Control */ 38 #define CLW_DPHYCONTRX 0x0020 /* Clock Lane DPHY Rx Control */ 39 #define D0W_DPHYCONTRX 0x0024 /* Data Lane 0 DPHY Rx Control */ 40 #define D1W_DPHYCONTRX 0x0028 /* Data Lane 1 DPHY Rx Control */ 41 #define D2W_DPHYCONTRX 0x002C /* Data Lane 2 DPHY Rx Control */ 42 #define D3W_DPHYCONTRX 0x0030 /* Data Lane 3 DPHY Rx Control */ 43 #define COM_DPHYCONTRX 0x0038 /* DPHY Rx Common Control */ 44 #define CLW_CNTRL 0x0040 /* Clock Lane Control */ 45 #define D0W_CNTRL 0x0044 /* Data Lane 0 Control */ 46 #define D1W_CNTRL 0x0048 /* Data Lane 1 Control */ 47 #define D2W_CNTRL 0x004C /* Data Lane 2 Control */ 48 #define D3W_CNTRL 0x0050 /* Data Lane 3 Control */ 49 #define DFTMODE_CNTRL 0x0054 /* DFT Mode Control */ 50 51 /* DSI PPI Layer Registers */ 52 #define PPI_STARTPPI 0x0104 /* START control bit of PPI-TX function. */ 53 #define PPI_START_FUNCTION 1 54 55 #define PPI_BUSYPPI 0x0108 56 #define PPI_LINEINITCNT 0x0110 /* Line Initialization Wait Counter */ 57 #define PPI_LPTXTIMECNT 0x0114 58 #define PPI_LANEENABLE 0x0134 /* Enables each lane at the PPI layer. */ 59 #define PPI_TX_RX_TA 0x013C /* DSI Bus Turn Around timing parameters */ 60 61 /* Analog timer function enable */ 62 #define PPI_CLS_ATMR 0x0140 /* Delay for Clock Lane in LPRX */ 63 #define PPI_D0S_ATMR 0x0144 /* Delay for Data Lane 0 in LPRX */ 64 #define PPI_D1S_ATMR 0x0148 /* Delay for Data Lane 1 in LPRX */ 65 #define PPI_D2S_ATMR 0x014C /* Delay for Data Lane 2 in LPRX */ 66 #define PPI_D3S_ATMR 0x0150 /* Delay for Data Lane 3 in LPRX */ 67 68 #define PPI_D0S_CLRSIPOCOUNT 0x0164 /* For lane 0 */ 69 #define PPI_D1S_CLRSIPOCOUNT 0x0168 /* For lane 1 */ 70 #define PPI_D2S_CLRSIPOCOUNT 0x016C /* For lane 2 */ 71 #define PPI_D3S_CLRSIPOCOUNT 0x0170 /* For lane 3 */ 72 73 #define CLS_PRE 0x0180 /* Digital Counter inside of PHY IO */ 74 #define D0S_PRE 0x0184 /* Digital Counter inside of PHY IO */ 75 #define D1S_PRE 0x0188 /* Digital Counter inside of PHY IO */ 76 #define D2S_PRE 0x018C /* Digital Counter inside of PHY IO */ 77 #define D3S_PRE 0x0190 /* Digital Counter inside of PHY IO */ 78 #define CLS_PREP 0x01A0 /* Digital Counter inside of PHY IO */ 79 #define D0S_PREP 0x01A4 /* Digital Counter inside of PHY IO */ 80 #define D1S_PREP 0x01A8 /* Digital Counter inside of PHY IO */ 81 #define D2S_PREP 0x01AC /* Digital Counter inside of PHY IO */ 82 #define D3S_PREP 0x01B0 /* Digital Counter inside of PHY IO */ 83 #define CLS_ZERO 0x01C0 /* Digital Counter inside of PHY IO */ 84 #define D0S_ZERO 0x01C4 /* Digital Counter inside of PHY IO */ 85 #define D1S_ZERO 0x01C8 /* Digital Counter inside of PHY IO */ 86 #define D2S_ZERO 0x01CC /* Digital Counter inside of PHY IO */ 87 #define D3S_ZERO 0x01D0 /* Digital Counter inside of PHY IO */ 88 89 #define PPI_CLRFLG 0x01E0 /* PRE Counters has reached set values */ 90 #define PPI_CLRSIPO 0x01E4 /* Clear SIPO values, Slave mode use only. */ 91 #define HSTIMEOUT 0x01F0 /* HS Rx Time Out Counter */ 92 #define HSTIMEOUTENABLE 0x01F4 /* Enable HS Rx Time Out Counter */ 93 #define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX function */ 94 #define DSI_RX_START 1 95 96 #define DSI_BUSYDSI 0x0208 97 #define DSI_LANEENABLE 0x0210 /* Enables each lane at the Protocol layer. */ 98 #define DSI_LANESTATUS0 0x0214 /* Displays lane is in HS RX mode. */ 99 #define DSI_LANESTATUS1 0x0218 /* Displays lane is in ULPS or STOP state */ 100 101 #define DSI_INTSTATUS 0x0220 /* Interrupt Status */ 102 #define DSI_INTMASK 0x0224 /* Interrupt Mask */ 103 #define DSI_INTCLR 0x0228 /* Interrupt Clear */ 104 #define DSI_LPTXTO 0x0230 /* Low Power Tx Time Out Counter */ 105 106 #define DSIERRCNT 0x0300 /* DSI Error Count */ 107 #define APLCTRL 0x0400 /* Application Layer Control */ 108 #define RDPKTLN 0x0404 /* Command Read Packet Length */ 109 110 #define VPCTRL 0x0450 /* Video Path Control */ 111 #define EVTMODE BIT(5) /* Video event mode enable, tc35876x only */ 112 #define HTIM1 0x0454 /* Horizontal Timing Control 1 */ 113 #define HTIM2 0x0458 /* Horizontal Timing Control 2 */ 114 #define VTIM1 0x045C /* Vertical Timing Control 1 */ 115 #define VTIM2 0x0460 /* Vertical Timing Control 2 */ 116 #define VFUEN 0x0464 /* Video Frame Timing Update Enable */ 117 #define VFUEN_EN BIT(0) /* Upload Enable */ 118 119 /* Mux Input Select for LVDS LINK Input */ 120 #define LV_MX0003 0x0480 /* Bit 0 to 3 */ 121 #define LV_MX0407 0x0484 /* Bit 4 to 7 */ 122 #define LV_MX0811 0x0488 /* Bit 8 to 11 */ 123 #define LV_MX1215 0x048C /* Bit 12 to 15 */ 124 #define LV_MX1619 0x0490 /* Bit 16 to 19 */ 125 #define LV_MX2023 0x0494 /* Bit 20 to 23 */ 126 #define LV_MX2427 0x0498 /* Bit 24 to 27 */ 127 #define LV_MX(b0, b1, b2, b3) (FLD_VAL(b0, 4, 0) | FLD_VAL(b1, 12, 8) | \ 128 FLD_VAL(b2, 20, 16) | FLD_VAL(b3, 28, 24)) 129 130 /* Input bit numbers used in mux registers */ 131 enum { 132 LVI_R0, 133 LVI_R1, 134 LVI_R2, 135 LVI_R3, 136 LVI_R4, 137 LVI_R5, 138 LVI_R6, 139 LVI_R7, 140 LVI_G0, 141 LVI_G1, 142 LVI_G2, 143 LVI_G3, 144 LVI_G4, 145 LVI_G5, 146 LVI_G6, 147 LVI_G7, 148 LVI_B0, 149 LVI_B1, 150 LVI_B2, 151 LVI_B3, 152 LVI_B4, 153 LVI_B5, 154 LVI_B6, 155 LVI_B7, 156 LVI_HS, 157 LVI_VS, 158 LVI_DE, 159 LVI_L0 160 }; 161 162 #define LVCFG 0x049C /* LVDS Configuration */ 163 #define LVPHY0 0x04A0 /* LVDS PHY 0 */ 164 #define LV_PHY0_RST(v) FLD_VAL(v, 22, 22) /* PHY reset */ 165 #define LV_PHY0_IS(v) FLD_VAL(v, 15, 14) 166 #define LV_PHY0_ND(v) FLD_VAL(v, 4, 0) /* Frequency range select */ 167 #define LV_PHY0_PRBS_ON(v) FLD_VAL(v, 20, 16) /* Clock/Data Flag pins */ 168 169 #define LVPHY1 0x04A4 /* LVDS PHY 1 */ 170 #define SYSSTAT 0x0500 /* System Status */ 171 #define SYSRST 0x0504 /* System Reset */ 172 173 #define SYS_RST_I2CS BIT(0) /* Reset I2C-Slave controller */ 174 #define SYS_RST_I2CM BIT(1) /* Reset I2C-Master controller */ 175 #define SYS_RST_LCD BIT(2) /* Reset LCD controller */ 176 #define SYS_RST_BM BIT(3) /* Reset Bus Management controller */ 177 #define SYS_RST_DSIRX BIT(4) /* Reset DSI-RX and App controller */ 178 #define SYS_RST_REG BIT(5) /* Reset Register module */ 179 180 /* GPIO Registers */ 181 #define GPIOC 0x0520 /* GPIO Control */ 182 #define GPIOO 0x0524 /* GPIO Output */ 183 #define GPIOI 0x0528 /* GPIO Input */ 184 185 /* I2C Registers */ 186 #define I2CTIMCTRL 0x0540 /* I2C IF Timing and Enable Control */ 187 #define I2CMADDR 0x0544 /* I2C Master Addressing */ 188 #define WDATAQ 0x0548 /* Write Data Queue */ 189 #define RDATAQ 0x054C /* Read Data Queue */ 190 191 /* Chip ID and Revision ID Register */ 192 #define IDREG 0x0580 193 194 #define LPX_PERIOD 4 195 #define TTA_GET 0x40000 196 #define TTA_SURE 6 197 #define SINGLE_LINK 1 198 #define DUAL_LINK 2 199 200 #define TC358775XBG_ID 0x00007500 201 202 /* Debug Registers */ 203 #define DEBUG00 0x05A0 /* Debug */ 204 #define DEBUG01 0x05A4 /* LVDS Data */ 205 206 #define DSI_CLEN_BIT BIT(0) 207 #define DIVIDE_BY_3 3 /* PCLK=DCLK/3 */ 208 #define DIVIDE_BY_6 6 /* PCLK=DCLK/6 */ 209 #define LVCFG_LVEN_BIT BIT(0) 210 211 #define L0EN BIT(1) 212 213 #define TC358775_VPCTRL_VSDELAY__MASK 0x3FF00000 214 #define TC358775_VPCTRL_VSDELAY__SHIFT 20 215 static inline u32 TC358775_VPCTRL_VSDELAY(uint32_t val) 216 { 217 return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) & 218 TC358775_VPCTRL_VSDELAY__MASK; 219 } 220 221 #define TC358775_VPCTRL_OPXLFMT__MASK 0x00000100 222 #define TC358775_VPCTRL_OPXLFMT__SHIFT 8 223 static inline u32 TC358775_VPCTRL_OPXLFMT(uint32_t val) 224 { 225 return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) & 226 TC358775_VPCTRL_OPXLFMT__MASK; 227 } 228 229 #define TC358775_VPCTRL_MSF__MASK 0x00000001 230 #define TC358775_VPCTRL_MSF__SHIFT 0 231 static inline u32 TC358775_VPCTRL_MSF(uint32_t val) 232 { 233 return ((val) << TC358775_VPCTRL_MSF__SHIFT) & 234 TC358775_VPCTRL_MSF__MASK; 235 } 236 237 #define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0 238 #define TC358775_LVCFG_PCLKDIV__SHIFT 4 239 static inline u32 TC358775_LVCFG_PCLKDIV(uint32_t val) 240 { 241 return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) & 242 TC358775_LVCFG_PCLKDIV__MASK; 243 } 244 245 #define TC358775_LVCFG_LVDLINK__MASK 0x00000002 246 #define TC358775_LVCFG_LVDLINK__SHIFT 1 247 static inline u32 TC358775_LVCFG_LVDLINK(uint32_t val) 248 { 249 return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) & 250 TC358775_LVCFG_LVDLINK__MASK; 251 } 252 253 enum tc358775_ports { 254 TC358775_DSI_IN, 255 TC358775_LVDS_OUT0, 256 TC358775_LVDS_OUT1, 257 }; 258 259 enum tc3587x5_type { 260 TC358765 = 0x65, 261 TC358775 = 0x75, 262 }; 263 264 struct tc_data { 265 struct i2c_client *i2c; 266 struct device *dev; 267 268 struct drm_bridge bridge; 269 struct drm_bridge *panel_bridge; 270 271 struct device_node *host_node; 272 struct mipi_dsi_device *dsi; 273 u8 num_dsi_lanes; 274 275 struct regulator *vdd; 276 struct regulator *vddio; 277 struct gpio_desc *reset_gpio; 278 struct gpio_desc *stby_gpio; 279 u8 lvds_link; /* single-link or dual-link */ 280 u8 bpc; 281 282 enum tc3587x5_type type; 283 }; 284 285 static inline struct tc_data *bridge_to_tc(struct drm_bridge *b) 286 { 287 return container_of(b, struct tc_data, bridge); 288 } 289 290 static void tc_bridge_pre_enable(struct drm_bridge *bridge) 291 { 292 struct tc_data *tc = bridge_to_tc(bridge); 293 struct device *dev = &tc->dsi->dev; 294 int ret; 295 296 ret = regulator_enable(tc->vddio); 297 if (ret < 0) 298 dev_err(dev, "regulator vddio enable failed, %d\n", ret); 299 usleep_range(10000, 11000); 300 301 ret = regulator_enable(tc->vdd); 302 if (ret < 0) 303 dev_err(dev, "regulator vdd enable failed, %d\n", ret); 304 usleep_range(10000, 11000); 305 306 gpiod_set_value(tc->stby_gpio, 0); 307 usleep_range(10000, 11000); 308 309 gpiod_set_value(tc->reset_gpio, 0); 310 usleep_range(10, 20); 311 } 312 313 static void tc_bridge_post_disable(struct drm_bridge *bridge) 314 { 315 struct tc_data *tc = bridge_to_tc(bridge); 316 struct device *dev = &tc->dsi->dev; 317 int ret; 318 319 gpiod_set_value(tc->reset_gpio, 1); 320 usleep_range(10, 20); 321 322 gpiod_set_value(tc->stby_gpio, 1); 323 usleep_range(10000, 11000); 324 325 ret = regulator_disable(tc->vdd); 326 if (ret < 0) 327 dev_err(dev, "regulator vdd disable failed, %d\n", ret); 328 usleep_range(10000, 11000); 329 330 ret = regulator_disable(tc->vddio); 331 if (ret < 0) 332 dev_err(dev, "regulator vddio disable failed, %d\n", ret); 333 usleep_range(10000, 11000); 334 } 335 336 static void d2l_read(struct i2c_client *i2c, u16 addr, u32 *val) 337 { 338 int ret; 339 u8 buf_addr[2]; 340 341 put_unaligned_be16(addr, buf_addr); 342 ret = i2c_master_send(i2c, buf_addr, sizeof(buf_addr)); 343 if (ret < 0) 344 goto fail; 345 346 ret = i2c_master_recv(i2c, (u8 *)val, sizeof(*val)); 347 if (ret < 0) 348 goto fail; 349 350 pr_debug("d2l: I2C : addr:%04x value:%08x\n", addr, *val); 351 return; 352 353 fail: 354 dev_err(&i2c->dev, "Error %d reading from subaddress 0x%x\n", 355 ret, addr); 356 } 357 358 static void d2l_write(struct i2c_client *i2c, u16 addr, u32 val) 359 { 360 u8 data[6]; 361 int ret; 362 363 put_unaligned_be16(addr, data); 364 put_unaligned_le32(val, data + 2); 365 366 ret = i2c_master_send(i2c, data, ARRAY_SIZE(data)); 367 if (ret < 0) 368 dev_err(&i2c->dev, "Error %d writing to subaddress 0x%x\n", 369 ret, addr); 370 } 371 372 /* helper function to access bus_formats */ 373 static struct drm_connector *get_connector(struct drm_encoder *encoder) 374 { 375 struct drm_device *dev = encoder->dev; 376 struct drm_connector *connector; 377 378 list_for_each_entry(connector, &dev->mode_config.connector_list, head) 379 if (connector->encoder == encoder) 380 return connector; 381 382 return NULL; 383 } 384 385 static void tc_bridge_enable(struct drm_bridge *bridge) 386 { 387 struct tc_data *tc = bridge_to_tc(bridge); 388 u32 hback_porch, hsync_len, hfront_porch, hactive, htime1, htime2; 389 u32 vback_porch, vsync_len, vfront_porch, vactive, vtime1, vtime2; 390 u32 val = 0; 391 u16 dsiclk, clkdiv, byteclk, t1, t2, t3, vsdelay; 392 struct drm_display_mode *mode; 393 struct drm_connector *connector = get_connector(bridge->encoder); 394 395 mode = &bridge->encoder->crtc->state->adjusted_mode; 396 397 hback_porch = mode->htotal - mode->hsync_end; 398 hsync_len = mode->hsync_end - mode->hsync_start; 399 vback_porch = mode->vtotal - mode->vsync_end; 400 vsync_len = mode->vsync_end - mode->vsync_start; 401 402 htime1 = (hback_porch << 16) + hsync_len; 403 vtime1 = (vback_porch << 16) + vsync_len; 404 405 hfront_porch = mode->hsync_start - mode->hdisplay; 406 hactive = mode->hdisplay; 407 vfront_porch = mode->vsync_start - mode->vdisplay; 408 vactive = mode->vdisplay; 409 410 htime2 = (hfront_porch << 16) + hactive; 411 vtime2 = (vfront_porch << 16) + vactive; 412 413 d2l_read(tc->i2c, IDREG, &val); 414 415 dev_info(tc->dev, "DSI2LVDS Chip ID.%02x Revision ID. %02x **\n", 416 (val >> 8) & 0xFF, val & 0xFF); 417 418 d2l_write(tc->i2c, SYSRST, SYS_RST_REG | SYS_RST_DSIRX | SYS_RST_BM | 419 SYS_RST_LCD | SYS_RST_I2CM); 420 usleep_range(30000, 40000); 421 422 d2l_write(tc->i2c, PPI_TX_RX_TA, TTA_GET | TTA_SURE); 423 d2l_write(tc->i2c, PPI_LPTXTIMECNT, LPX_PERIOD); 424 d2l_write(tc->i2c, PPI_D0S_CLRSIPOCOUNT, 3); 425 d2l_write(tc->i2c, PPI_D1S_CLRSIPOCOUNT, 3); 426 d2l_write(tc->i2c, PPI_D2S_CLRSIPOCOUNT, 3); 427 d2l_write(tc->i2c, PPI_D3S_CLRSIPOCOUNT, 3); 428 429 val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT; 430 d2l_write(tc->i2c, PPI_LANEENABLE, val); 431 d2l_write(tc->i2c, DSI_LANEENABLE, val); 432 433 d2l_write(tc->i2c, PPI_STARTPPI, PPI_START_FUNCTION); 434 d2l_write(tc->i2c, DSI_STARTDSI, DSI_RX_START); 435 436 /* Video event mode vs pulse mode bit, does not exist for tc358775 */ 437 if (tc->type == TC358765) 438 val = EVTMODE; 439 else 440 val = 0; 441 442 if (tc->bpc == 8) 443 val |= TC358775_VPCTRL_OPXLFMT(1); 444 else /* bpc = 6; */ 445 val |= TC358775_VPCTRL_MSF(1); 446 447 dsiclk = mode->crtc_clock * 3 * tc->bpc / tc->num_dsi_lanes / 1000; 448 clkdiv = dsiclk / (tc->lvds_link == DUAL_LINK ? DIVIDE_BY_6 : DIVIDE_BY_3); 449 byteclk = dsiclk / 4; 450 t1 = hactive * (tc->bpc * 3 / 8) / tc->num_dsi_lanes; 451 t2 = ((100000 / clkdiv)) * (hactive + hback_porch + hsync_len + hfront_porch) / 1000; 452 t3 = ((t2 * byteclk) / 100) - (hactive * (tc->bpc * 3 / 8) / 453 tc->num_dsi_lanes); 454 455 vsdelay = (clkdiv * (t1 + t3) / byteclk) - hback_porch - hsync_len - hactive; 456 457 val |= TC358775_VPCTRL_VSDELAY(vsdelay); 458 d2l_write(tc->i2c, VPCTRL, val); 459 460 d2l_write(tc->i2c, HTIM1, htime1); 461 d2l_write(tc->i2c, VTIM1, vtime1); 462 d2l_write(tc->i2c, HTIM2, htime2); 463 d2l_write(tc->i2c, VTIM2, vtime2); 464 465 d2l_write(tc->i2c, VFUEN, VFUEN_EN); 466 d2l_write(tc->i2c, SYSRST, SYS_RST_LCD); 467 d2l_write(tc->i2c, LVPHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_ND(6)); 468 469 dev_dbg(tc->dev, "bus_formats %04x bpc %d\n", 470 connector->display_info.bus_formats[0], 471 tc->bpc); 472 if (connector->display_info.bus_formats[0] == 473 MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) { 474 /* VESA-24 */ 475 d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3)); 476 d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0)); 477 d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_G6, LVI_G7)); 478 d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0)); 479 d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_B6, LVI_B7, LVI_B1, LVI_B2)); 480 d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0)); 481 d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R6)); 482 } else { 483 /* JEIDA-18 and JEIDA-24 */ 484 d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R2, LVI_R3, LVI_R4, LVI_R5)); 485 d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R6, LVI_R1, LVI_R7, LVI_G2)); 486 d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G3, LVI_G4, LVI_G0, LVI_G1)); 487 d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G5, LVI_G6, LVI_G7, LVI_B2)); 488 d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_B0, LVI_B1, LVI_B3, LVI_B4)); 489 d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B5, LVI_B6, LVI_B7, LVI_L0)); 490 d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R0)); 491 } 492 493 d2l_write(tc->i2c, VFUEN, VFUEN_EN); 494 495 val = LVCFG_LVEN_BIT; 496 if (tc->lvds_link == DUAL_LINK) { 497 val |= TC358775_LVCFG_LVDLINK(1); 498 val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_6); 499 } else { 500 val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3); 501 } 502 d2l_write(tc->i2c, LVCFG, val); 503 } 504 505 static enum drm_mode_status 506 tc_mode_valid(struct drm_bridge *bridge, 507 const struct drm_display_info *info, 508 const struct drm_display_mode *mode) 509 { 510 struct tc_data *tc = bridge_to_tc(bridge); 511 512 /* 513 * Maximum pixel clock speed 135MHz for single-link 514 * 270MHz for dual-link 515 */ 516 if ((mode->clock > 135000 && tc->lvds_link == SINGLE_LINK) || 517 (mode->clock > 270000 && tc->lvds_link == DUAL_LINK)) 518 return MODE_CLOCK_HIGH; 519 520 switch (info->bus_formats[0]) { 521 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: 522 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: 523 /* RGB888 */ 524 tc->bpc = 8; 525 break; 526 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: 527 /* RGB666 */ 528 tc->bpc = 6; 529 break; 530 default: 531 dev_warn(tc->dev, 532 "unsupported LVDS bus format 0x%04x\n", 533 info->bus_formats[0]); 534 return MODE_NOMODE; 535 } 536 537 return MODE_OK; 538 } 539 540 static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc) 541 { 542 struct device_node *endpoint; 543 struct device_node *remote; 544 int dsi_lanes = -1; 545 546 endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node, 547 TC358775_DSI_IN, -1); 548 dsi_lanes = drm_of_get_data_lanes_count(endpoint, 1, 4); 549 550 /* Quirk old dtb: Use data lanes from the DSI host side instead of bridge */ 551 if (dsi_lanes == -EINVAL || dsi_lanes == -ENODEV) { 552 remote = of_graph_get_remote_endpoint(endpoint); 553 dsi_lanes = drm_of_get_data_lanes_count(remote, 1, 4); 554 of_node_put(remote); 555 if (dsi_lanes >= 1) 556 dev_warn(tc->dev, "no dsi-lanes for the bridge, using host lanes\n"); 557 } 558 559 of_node_put(endpoint); 560 561 if (dsi_lanes < 0) 562 return dsi_lanes; 563 564 tc->num_dsi_lanes = dsi_lanes; 565 566 tc->host_node = of_graph_get_remote_node(np, 0, 0); 567 if (!tc->host_node) 568 return -ENODEV; 569 570 of_node_put(tc->host_node); 571 572 tc->lvds_link = SINGLE_LINK; 573 endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node, 574 TC358775_LVDS_OUT1, -1); 575 if (endpoint) { 576 remote = of_graph_get_remote_port_parent(endpoint); 577 of_node_put(endpoint); 578 579 if (remote) { 580 if (of_device_is_available(remote)) 581 tc->lvds_link = DUAL_LINK; 582 of_node_put(remote); 583 } 584 } 585 586 dev_dbg(tc->dev, "no.of dsi lanes: %d\n", tc->num_dsi_lanes); 587 dev_dbg(tc->dev, "operating in %d-link mode\n", tc->lvds_link); 588 589 return 0; 590 } 591 592 static int tc_bridge_attach(struct drm_bridge *bridge, 593 enum drm_bridge_attach_flags flags) 594 { 595 struct tc_data *tc = bridge_to_tc(bridge); 596 597 /* Attach the panel-bridge to the dsi bridge */ 598 return drm_bridge_attach(bridge->encoder, tc->panel_bridge, 599 &tc->bridge, flags); 600 } 601 602 static const struct drm_bridge_funcs tc_bridge_funcs = { 603 .attach = tc_bridge_attach, 604 .pre_enable = tc_bridge_pre_enable, 605 .enable = tc_bridge_enable, 606 .mode_valid = tc_mode_valid, 607 .post_disable = tc_bridge_post_disable, 608 }; 609 610 static int tc_attach_host(struct tc_data *tc) 611 { 612 struct device *dev = &tc->i2c->dev; 613 struct mipi_dsi_host *host; 614 struct mipi_dsi_device *dsi; 615 int ret; 616 const struct mipi_dsi_device_info info = { .type = "tc358775", 617 .channel = 0, 618 .node = NULL, 619 }; 620 621 host = of_find_mipi_dsi_host_by_node(tc->host_node); 622 if (!host) 623 return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n"); 624 625 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 626 if (IS_ERR(dsi)) { 627 dev_err(dev, "failed to create dsi device\n"); 628 return PTR_ERR(dsi); 629 } 630 631 tc->dsi = dsi; 632 633 dsi->lanes = tc->num_dsi_lanes; 634 dsi->format = MIPI_DSI_FMT_RGB888; 635 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 636 MIPI_DSI_MODE_LPM; 637 638 /* 639 * The hs_rate and lp_rate are data rate values. The HS mode is 640 * differential, while the LP mode is single ended. As the HS mode 641 * uses DDR, the DSI clock frequency is half the hs_rate. The 10 Mbs 642 * data rate for LP mode is not specified in the bridge data sheet, 643 * but seems to be part of the MIPI DSI spec. 644 */ 645 if (tc->type == TC358765) 646 dsi->hs_rate = 800000000; 647 else 648 dsi->hs_rate = 1000000000; 649 dsi->lp_rate = 10000000; 650 651 ret = devm_mipi_dsi_attach(dev, dsi); 652 if (ret < 0) { 653 dev_err(dev, "failed to attach dsi to host\n"); 654 return ret; 655 } 656 657 return 0; 658 } 659 660 static int tc_probe(struct i2c_client *client) 661 { 662 struct device *dev = &client->dev; 663 struct tc_data *tc; 664 int ret; 665 666 tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL); 667 if (!tc) 668 return -ENOMEM; 669 670 tc->dev = dev; 671 tc->i2c = client; 672 tc->type = (enum tc3587x5_type)(unsigned long)of_device_get_match_data(dev); 673 674 tc->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 675 TC358775_LVDS_OUT0, 0); 676 if (IS_ERR(tc->panel_bridge)) 677 return PTR_ERR(tc->panel_bridge); 678 679 ret = tc358775_parse_dt(dev->of_node, tc); 680 if (ret) 681 return ret; 682 683 tc->vddio = devm_regulator_get(dev, "vddio-supply"); 684 if (IS_ERR(tc->vddio)) { 685 ret = PTR_ERR(tc->vddio); 686 dev_err(dev, "vddio-supply not found\n"); 687 return ret; 688 } 689 690 tc->vdd = devm_regulator_get(dev, "vdd-supply"); 691 if (IS_ERR(tc->vdd)) { 692 ret = PTR_ERR(tc->vdd); 693 dev_err(dev, "vdd-supply not found\n"); 694 return ret; 695 } 696 697 tc->stby_gpio = devm_gpiod_get_optional(dev, "stby", GPIOD_OUT_HIGH); 698 if (IS_ERR(tc->stby_gpio)) 699 return PTR_ERR(tc->stby_gpio); 700 701 tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 702 if (IS_ERR(tc->reset_gpio)) { 703 ret = PTR_ERR(tc->reset_gpio); 704 dev_err(dev, "cannot get reset-gpios %d\n", ret); 705 return ret; 706 } 707 708 tc->bridge.funcs = &tc_bridge_funcs; 709 tc->bridge.of_node = dev->of_node; 710 tc->bridge.pre_enable_prev_first = true; 711 drm_bridge_add(&tc->bridge); 712 713 i2c_set_clientdata(client, tc); 714 715 ret = tc_attach_host(tc); 716 if (ret) 717 goto err_bridge_remove; 718 719 return 0; 720 721 err_bridge_remove: 722 drm_bridge_remove(&tc->bridge); 723 return ret; 724 } 725 726 static void tc_remove(struct i2c_client *client) 727 { 728 struct tc_data *tc = i2c_get_clientdata(client); 729 730 drm_bridge_remove(&tc->bridge); 731 } 732 733 static const struct i2c_device_id tc358775_i2c_ids[] = { 734 { "tc358765", TC358765, }, 735 { "tc358775", TC358775, }, 736 { } 737 }; 738 MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids); 739 740 static const struct of_device_id tc358775_of_ids[] = { 741 { .compatible = "toshiba,tc358765", .data = (void *)TC358765, }, 742 { .compatible = "toshiba,tc358775", .data = (void *)TC358775, }, 743 { } 744 }; 745 MODULE_DEVICE_TABLE(of, tc358775_of_ids); 746 747 static struct i2c_driver tc358775_driver = { 748 .driver = { 749 .name = "tc358775", 750 .of_match_table = tc358775_of_ids, 751 }, 752 .id_table = tc358775_i2c_ids, 753 .probe = tc_probe, 754 .remove = tc_remove, 755 }; 756 module_i2c_driver(tc358775_driver); 757 758 MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>"); 759 MODULE_DESCRIPTION("TC358775 DSI/LVDS bridge driver"); 760 MODULE_LICENSE("GPL v2"); 761