drivers/gpu/drm/radeon/radeon_i2c.c

   1 /*
   2  * Copyright 2007-8 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors: Dave Airlie
  24  *          Alex Deucher
  25  */
  26 #include <linux/export.h>
  27
  28 #include "drmP.h"
  29 #include "radeon_drm.h"
  30 #include "radeon.h"
  31 #include "atom.h"
  32
  33 extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
  34                                    struct i2c_msg *msgs, int num);
  35 extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
  36
  37 /**
  38  * radeon_ddc_probe
  39  *
  40  */
  41 bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
  42 {
  43         u8 out = 0x0;
  44         u8 buf[8];
  45         int ret;
  46         struct i2c_msg msgs[] = {
  47                 {
  48                         .addr = 0x50,
  49                         .flags = 0,
  50                         .len = 1,
  51                         .buf = &out,
  52                 },
  53                 {
  54                         .addr = 0x50,
  55                         .flags = I2C_M_RD,
  56                         .len = 8,
  57                         .buf = buf,
  58                 }
  59         };
  60
  61         /* on hw with routers, select right port */
  62         if (radeon_connector->router.ddc_valid)
  63                 radeon_router_select_ddc_port(radeon_connector);
  64
  65         ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
  66         if (ret != 2)
  67                 /* Couldn't find an accessible DDC on this connector */
  68                 return false;
  69         /* Probe also for valid EDID header
  70          * EDID header starts with:
  71          * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
  72          * Only the first 6 bytes must be valid as
  73          * drm_edid_block_valid() can fix the last 2 bytes */
  74         if (drm_edid_header_is_valid(buf) < 6) {
  75                 /* Couldn't find an accessible EDID on this
  76                  * connector */
  77                 return false;
  78         }
  79         return true;
  80 }
  81
  82 /* bit banging i2c */
  83
  84 static int pre_xfer(struct i2c_adapter *i2c_adap)
  85 {
  86         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
  87         struct radeon_device *rdev = i2c->dev->dev_private;
  88         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  89         uint32_t temp;
  90
  91         /* RV410 appears to have a bug where the hw i2c in reset
  92          * holds the i2c port in a bad state - switch hw i2c away before
  93          * doing DDC - do this for all r200s/r300s/r400s for safety sake
  94          */
  95         if (rec->hw_capable) {
  96                 if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
  97                         u32 reg;
  98
  99                         if (rdev->family >= CHIP_RV350)
 100                                 reg = RADEON_GPIO_MONID;
 101                         else if ((rdev->family == CHIP_R300) ||
 102                                  (rdev->family == CHIP_R350))
 103                                 reg = RADEON_GPIO_DVI_DDC;
 104                         else
 105                                 reg = RADEON_GPIO_CRT2_DDC;
 106
 107                         mutex_lock(&rdev->dc_hw_i2c_mutex);
 108                         if (rec->a_clk_reg == reg) {
 109                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
 110                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
 111                         } else {
 112                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
 113                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
 114                         }
 115                         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 116                 }
 117         }
 118
 119         /* switch the pads to ddc mode */
 120         if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
 121                 temp = RREG32(rec->mask_clk_reg);
 122                 temp &= ~(1 << 16);
 123                 WREG32(rec->mask_clk_reg, temp);
 124         }
 125
 126         /* clear the output pin values */
 127         temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
 128         WREG32(rec->a_clk_reg, temp);
 129
 130         temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
 131         WREG32(rec->a_data_reg, temp);
 132
 133         /* set the pins to input */
 134         temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 135         WREG32(rec->en_clk_reg, temp);
 136
 137         temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 138         WREG32(rec->en_data_reg, temp);
 139
 140         /* mask the gpio pins for software use */
 141         temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
 142         WREG32(rec->mask_clk_reg, temp);
 143         temp = RREG32(rec->mask_clk_reg);
 144
 145         temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
 146         WREG32(rec->mask_data_reg, temp);
 147         temp = RREG32(rec->mask_data_reg);
 148
 149         return 0;
 150 }
 151
 152 static void post_xfer(struct i2c_adapter *i2c_adap)
 153 {
 154         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 155         struct radeon_device *rdev = i2c->dev->dev_private;
 156         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 157         uint32_t temp;
 158
 159         /* unmask the gpio pins for software use */
 160         temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
 161         WREG32(rec->mask_clk_reg, temp);
 162         temp = RREG32(rec->mask_clk_reg);
 163
 164         temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
 165         WREG32(rec->mask_data_reg, temp);
 166         temp = RREG32(rec->mask_data_reg);
 167 }
 168
 169 static int get_clock(void *i2c_priv)
 170 {
 171         struct radeon_i2c_chan *i2c = i2c_priv;
 172         struct radeon_device *rdev = i2c->dev->dev_private;
 173         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 174         uint32_t val;
 175
 176         /* read the value off the pin */
 177         val = RREG32(rec->y_clk_reg);
 178         val &= rec->y_clk_mask;
 179
 180         return (val != 0);
 181 }
 182
 183
 184 static int get_data(void *i2c_priv)
 185 {
 186         struct radeon_i2c_chan *i2c = i2c_priv;
 187         struct radeon_device *rdev = i2c->dev->dev_private;
 188         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 189         uint32_t val;
 190
 191         /* read the value off the pin */
 192         val = RREG32(rec->y_data_reg);
 193         val &= rec->y_data_mask;
 194
 195         return (val != 0);
 196 }
 197
 198 static void set_clock(void *i2c_priv, int clock)
 199 {
 200         struct radeon_i2c_chan *i2c = i2c_priv;
 201         struct radeon_device *rdev = i2c->dev->dev_private;
 202         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 203         uint32_t val;
 204
 205         /* set pin direction */
 206         val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 207         val |= clock ? 0 : rec->en_clk_mask;
 208         WREG32(rec->en_clk_reg, val);
 209 }
 210
 211 static void set_data(void *i2c_priv, int data)
 212 {
 213         struct radeon_i2c_chan *i2c = i2c_priv;
 214         struct radeon_device *rdev = i2c->dev->dev_private;
 215         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 216         uint32_t val;
 217
 218         /* set pin direction */
 219         val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 220         val |= data ? 0 : rec->en_data_mask;
 221         WREG32(rec->en_data_reg, val);
 222 }
 223
 224 /* hw i2c */
 225
 226 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
 227 {
 228         u32 sclk = rdev->pm.current_sclk;
 229         u32 prescale = 0;
 230         u32 nm;
 231         u8 n, m, loop;
 232         int i2c_clock;
 233
 234         switch (rdev->family) {
 235         case CHIP_R100:
 236         case CHIP_RV100:
 237         case CHIP_RS100:
 238         case CHIP_RV200:
 239         case CHIP_RS200:
 240         case CHIP_R200:
 241         case CHIP_RV250:
 242         case CHIP_RS300:
 243         case CHIP_RV280:
 244         case CHIP_R300:
 245         case CHIP_R350:
 246         case CHIP_RV350:
 247                 i2c_clock = 60;
 248                 nm = (sclk * 10) / (i2c_clock * 4);
 249                 for (loop = 1; loop < 255; loop++) {
 250                         if ((nm / loop) < loop)
 251                                 break;
 252                 }
 253                 n = loop - 1;
 254                 m = loop - 2;
 255                 prescale = m | (n << 8);
 256                 break;
 257         case CHIP_RV380:
 258         case CHIP_RS400:
 259         case CHIP_RS480:
 260         case CHIP_R420:
 261         case CHIP_R423:
 262         case CHIP_RV410:
 263                 prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
 264                 break;
 265         case CHIP_RS600:
 266         case CHIP_RS690:
 267         case CHIP_RS740:
 268                 /* todo */
 269                 break;
 270         case CHIP_RV515:
 271         case CHIP_R520:
 272         case CHIP_RV530:
 273         case CHIP_RV560:
 274         case CHIP_RV570:
 275         case CHIP_R580:
 276                 i2c_clock = 50;
 277                 if (rdev->family == CHIP_R520)
 278                         prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
 279                 else
 280                         prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
 281                 break;
 282         case CHIP_R600:
 283         case CHIP_RV610:
 284         case CHIP_RV630:
 285         case CHIP_RV670:
 286                 /* todo */
 287                 break;
 288         case CHIP_RV620:
 289         case CHIP_RV635:
 290         case CHIP_RS780:
 291         case CHIP_RS880:
 292         case CHIP_RV770:
 293         case CHIP_RV730:
 294         case CHIP_RV710:
 295         case CHIP_RV740:
 296                 /* todo */
 297                 break;
 298         case CHIP_CEDAR:
 299         case CHIP_REDWOOD:
 300         case CHIP_JUNIPER:
 301         case CHIP_CYPRESS:
 302         case CHIP_HEMLOCK:
 303                 /* todo */
 304                 break;
 305         default:
 306                 DRM_ERROR("i2c: unhandled radeon chip\n");
 307                 break;
 308         }
 309         return prescale;
 310 }
 311
 312
 313 /* hw i2c engine for r1xx-4xx hardware
 314  * hw can buffer up to 15 bytes
 315  */
 316 static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 317                             struct i2c_msg *msgs, int num)
 318 {
 319         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 320         struct radeon_device *rdev = i2c->dev->dev_private;
 321         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 322         struct i2c_msg *p;
 323         int i, j, k, ret = num;
 324         u32 prescale;
 325         u32 i2c_cntl_0, i2c_cntl_1, i2c_data;
 326         u32 tmp, reg;
 327
 328         mutex_lock(&rdev->dc_hw_i2c_mutex);
 329         /* take the pm lock since we need a constant sclk */
 330         mutex_lock(&rdev->pm.mutex);
 331
 332         prescale = radeon_get_i2c_prescale(rdev);
 333
 334         reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
 335                RADEON_I2C_DRIVE_EN |
 336                RADEON_I2C_START |
 337                RADEON_I2C_STOP |
 338                RADEON_I2C_GO);
 339
 340         if (rdev->is_atom_bios) {
 341                 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 342                 WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
 343         }
 344
 345         if (rec->mm_i2c) {
 346                 i2c_cntl_0 = RADEON_I2C_CNTL_0;
 347                 i2c_cntl_1 = RADEON_I2C_CNTL_1;
 348                 i2c_data = RADEON_I2C_DATA;
 349         } else {
 350                 i2c_cntl_0 = RADEON_DVI_I2C_CNTL_0;
 351                 i2c_cntl_1 = RADEON_DVI_I2C_CNTL_1;
 352                 i2c_data = RADEON_DVI_I2C_DATA;
 353
 354                 switch (rdev->family) {
 355                 case CHIP_R100:
 356                 case CHIP_RV100:
 357                 case CHIP_RS100:
 358                 case CHIP_RV200:
 359                 case CHIP_RS200:
 360                 case CHIP_RS300:
 361                         switch (rec->mask_clk_reg) {
 362                         case RADEON_GPIO_DVI_DDC:
 363                                 /* no gpio select bit */
 364                                 break;
 365                         default:
 366                                 DRM_ERROR("gpio not supported with hw i2c\n");
 367                                 ret = -EINVAL;
 368                                 goto done;
 369                         }
 370                         break;
 371                 case CHIP_R200:
 372                         /* only bit 4 on r200 */
 373                         switch (rec->mask_clk_reg) {
 374                         case RADEON_GPIO_DVI_DDC:
 375                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 376                                 break;
 377                         case RADEON_GPIO_MONID:
 378                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 379                                 break;
 380                         default:
 381                                 DRM_ERROR("gpio not supported with hw i2c\n");
 382                                 ret = -EINVAL;
 383                                 goto done;
 384                         }
 385                         break;
 386                 case CHIP_RV250:
 387                 case CHIP_RV280:
 388                         /* bits 3 and 4 */
 389                         switch (rec->mask_clk_reg) {
 390                         case RADEON_GPIO_DVI_DDC:
 391                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 392                                 break;
 393                         case RADEON_GPIO_VGA_DDC:
 394                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
 395                                 break;
 396                         case RADEON_GPIO_CRT2_DDC:
 397                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 398                                 break;
 399                         default:
 400                                 DRM_ERROR("gpio not supported with hw i2c\n");
 401                                 ret = -EINVAL;
 402                                 goto done;
 403                         }
 404                         break;
 405                 case CHIP_R300:
 406                 case CHIP_R350:
 407                         /* only bit 4 on r300/r350 */
 408                         switch (rec->mask_clk_reg) {
 409                         case RADEON_GPIO_VGA_DDC:
 410                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 411                                 break;
 412                         case RADEON_GPIO_DVI_DDC:
 413                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 414                                 break;
 415                         default:
 416                                 DRM_ERROR("gpio not supported with hw i2c\n");
 417                                 ret = -EINVAL;
 418                                 goto done;
 419                         }
 420                         break;
 421                 case CHIP_RV350:
 422                 case CHIP_RV380:
 423                 case CHIP_R420:
 424                 case CHIP_R423:
 425                 case CHIP_RV410:
 426                 case CHIP_RS400:
 427                 case CHIP_RS480:
 428                         /* bits 3 and 4 */
 429                         switch (rec->mask_clk_reg) {
 430                         case RADEON_GPIO_VGA_DDC:
 431                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 432                                 break;
 433                         case RADEON_GPIO_DVI_DDC:
 434                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
 435                                 break;
 436                         case RADEON_GPIO_MONID:
 437                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 438                                 break;
 439                         default:
 440                                 DRM_ERROR("gpio not supported with hw i2c\n");
 441                                 ret = -EINVAL;
 442                                 goto done;
 443                         }
 444                         break;
 445                 default:
 446                         DRM_ERROR("unsupported asic\n");
 447                         ret = -EINVAL;
 448                         goto done;
 449                         break;
 450                 }
 451         }
 452
 453         /* check for bus probe */
 454         p = &msgs[0];
 455         if ((num == 1) && (p->len == 0)) {
 456                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 457                                     RADEON_I2C_NACK |
 458                                     RADEON_I2C_HALT |
 459                                     RADEON_I2C_SOFT_RST));
 460                 WREG32(i2c_data, (p->addr << 1) & 0xff);
 461                 WREG32(i2c_data, 0);
 462                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 463                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 464                                     RADEON_I2C_EN |
 465                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 466                 WREG32(i2c_cntl_0, reg);
 467                 for (k = 0; k < 32; k++) {
 468                         udelay(10);
 469                         tmp = RREG32(i2c_cntl_0);
 470                         if (tmp & RADEON_I2C_GO)
 471                                 continue;
 472                         tmp = RREG32(i2c_cntl_0);
 473                         if (tmp & RADEON_I2C_DONE)
 474                                 break;
 475                         else {
 476                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 477                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 478                                 ret = -EIO;
 479                                 goto done;
 480                         }
 481                 }
 482                 goto done;
 483         }
 484
 485         for (i = 0; i < num; i++) {
 486                 p = &msgs[i];
 487                 for (j = 0; j < p->len; j++) {
 488                         if (p->flags & I2C_M_RD) {
 489                                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 490                                                     RADEON_I2C_NACK |
 491                                                     RADEON_I2C_HALT |
 492                                                     RADEON_I2C_SOFT_RST));
 493                                 WREG32(i2c_data, ((p->addr << 1) & 0xff) | 0x1);
 494                                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 495                                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 496                                                     RADEON_I2C_EN |
 497                                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 498                                 WREG32(i2c_cntl_0, reg | RADEON_I2C_RECEIVE);
 499                                 for (k = 0; k < 32; k++) {
 500                                         udelay(10);
 501                                         tmp = RREG32(i2c_cntl_0);
 502                                         if (tmp & RADEON_I2C_GO)
 503                                                 continue;
 504                                         tmp = RREG32(i2c_cntl_0);
 505                                         if (tmp & RADEON_I2C_DONE)
 506                                                 break;
 507                                         else {
 508                                                 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
 509                                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 510                                                 ret = -EIO;
 511                                                 goto done;
 512                                         }
 513                                 }
 514                                 p->buf[j] = RREG32(i2c_data) & 0xff;
 515                         } else {
 516                                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 517                                                     RADEON_I2C_NACK |
 518                                                     RADEON_I2C_HALT |
 519                                                     RADEON_I2C_SOFT_RST));
 520                                 WREG32(i2c_data, (p->addr << 1) & 0xff);
 521                                 WREG32(i2c_data, p->buf[j]);
 522                                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 523                                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 524                                                     RADEON_I2C_EN |
 525                                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 526                                 WREG32(i2c_cntl_0, reg);
 527                                 for (k = 0; k < 32; k++) {
 528                                         udelay(10);
 529                                         tmp = RREG32(i2c_cntl_0);
 530                                         if (tmp & RADEON_I2C_GO)
 531                                                 continue;
 532                                         tmp = RREG32(i2c_cntl_0);
 533                                         if (tmp & RADEON_I2C_DONE)
 534                                                 break;
 535                                         else {
 536                                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 537                                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 538                                                 ret = -EIO;
 539                                                 goto done;
 540                                         }
 541                                 }
 542                         }
 543                 }
 544         }
 545
 546 done:
 547         WREG32(i2c_cntl_0, 0);
 548         WREG32(i2c_cntl_1, 0);
 549         WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 550                             RADEON_I2C_NACK |
 551                             RADEON_I2C_HALT |
 552                             RADEON_I2C_SOFT_RST));
 553
 554         if (rdev->is_atom_bios) {
 555                 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 556                 tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
 557                 WREG32(RADEON_BIOS_6_SCRATCH, tmp);
 558         }
 559
 560         mutex_unlock(&rdev->pm.mutex);
 561         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 562
 563         return ret;
 564 }
 565
 566 /* hw i2c engine for r5xx hardware
 567  * hw can buffer up to 15 bytes
 568  */
 569 static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 570                             struct i2c_msg *msgs, int num)
 571 {
 572         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 573         struct radeon_device *rdev = i2c->dev->dev_private;
 574         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 575         struct i2c_msg *p;
 576         int i, j, remaining, current_count, buffer_offset, ret = num;
 577         u32 prescale;
 578         u32 tmp, reg;
 579         u32 saved1, saved2;
 580
 581         mutex_lock(&rdev->dc_hw_i2c_mutex);
 582         /* take the pm lock since we need a constant sclk */
 583         mutex_lock(&rdev->pm.mutex);
 584
 585         prescale = radeon_get_i2c_prescale(rdev);
 586
 587         /* clear gpio mask bits */
 588         tmp = RREG32(rec->mask_clk_reg);
 589         tmp &= ~rec->mask_clk_mask;
 590         WREG32(rec->mask_clk_reg, tmp);
 591         tmp = RREG32(rec->mask_clk_reg);
 592
 593         tmp = RREG32(rec->mask_data_reg);
 594         tmp &= ~rec->mask_data_mask;
 595         WREG32(rec->mask_data_reg, tmp);
 596         tmp = RREG32(rec->mask_data_reg);
 597
 598         /* clear pin values */
 599         tmp = RREG32(rec->a_clk_reg);
 600         tmp &= ~rec->a_clk_mask;
 601         WREG32(rec->a_clk_reg, tmp);
 602         tmp = RREG32(rec->a_clk_reg);
 603
 604         tmp = RREG32(rec->a_data_reg);
 605         tmp &= ~rec->a_data_mask;
 606         WREG32(rec->a_data_reg, tmp);
 607         tmp = RREG32(rec->a_data_reg);
 608
 609         /* set the pins to input */
 610         tmp = RREG32(rec->en_clk_reg);
 611         tmp &= ~rec->en_clk_mask;
 612         WREG32(rec->en_clk_reg, tmp);
 613         tmp = RREG32(rec->en_clk_reg);
 614
 615         tmp = RREG32(rec->en_data_reg);
 616         tmp &= ~rec->en_data_mask;
 617         WREG32(rec->en_data_reg, tmp);
 618         tmp = RREG32(rec->en_data_reg);
 619
 620         /* */
 621         tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 622         WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
 623         saved1 = RREG32(AVIVO_DC_I2C_CONTROL1);
 624         saved2 = RREG32(0x494);
 625         WREG32(0x494, saved2 | 0x1);
 626
 627         WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_WANTS_TO_USE_I2C);
 628         for (i = 0; i < 50; i++) {
 629                 udelay(1);
 630                 if (RREG32(AVIVO_DC_I2C_ARBITRATION) & AVIVO_DC_I2C_SW_CAN_USE_I2C)
 631                         break;
 632         }
 633         if (i == 50) {
 634                 DRM_ERROR("failed to get i2c bus\n");
 635                 ret = -EBUSY;
 636                 goto done;
 637         }
 638
 639         reg = AVIVO_DC_I2C_START | AVIVO_DC_I2C_STOP | AVIVO_DC_I2C_EN;
 640         switch (rec->mask_clk_reg) {
 641         case AVIVO_DC_GPIO_DDC1_MASK:
 642                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC1);
 643                 break;
 644         case AVIVO_DC_GPIO_DDC2_MASK:
 645                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC2);
 646                 break;
 647         case AVIVO_DC_GPIO_DDC3_MASK:
 648                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC3);
 649                 break;
 650         default:
 651                 DRM_ERROR("gpio not supported with hw i2c\n");
 652                 ret = -EINVAL;
 653                 goto done;
 654         }
 655
 656         /* check for bus probe */
 657         p = &msgs[0];
 658         if ((num == 1) && (p->len == 0)) {
 659                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 660                                               AVIVO_DC_I2C_NACK |
 661                                               AVIVO_DC_I2C_HALT));
 662                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 663                 udelay(1);
 664                 WREG32(AVIVO_DC_I2C_RESET, 0);
 665
 666                 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
 667                 WREG32(AVIVO_DC_I2C_DATA, 0);
 668
 669                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 670                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 671                                                AVIVO_DC_I2C_DATA_COUNT(1) |
 672                                                (prescale << 16)));
 673                 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
 674                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 675                 for (j = 0; j < 200; j++) {
 676                         udelay(50);
 677                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 678                         if (tmp & AVIVO_DC_I2C_GO)
 679                                 continue;
 680                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 681                         if (tmp & AVIVO_DC_I2C_DONE)
 682                                 break;
 683                         else {
 684                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 685                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 686                                 ret = -EIO;
 687                                 goto done;
 688                         }
 689                 }
 690                 goto done;
 691         }
 692
 693         for (i = 0; i < num; i++) {
 694                 p = &msgs[i];
 695                 remaining = p->len;
 696                 buffer_offset = 0;
 697                 if (p->flags & I2C_M_RD) {
 698                         while (remaining) {
 699                                 if (remaining > 15)
 700                                         current_count = 15;
 701                                 else
 702                                         current_count = remaining;
 703                                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 704                                                               AVIVO_DC_I2C_NACK |
 705                                                               AVIVO_DC_I2C_HALT));
 706                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 707                                 udelay(1);
 708                                 WREG32(AVIVO_DC_I2C_RESET, 0);
 709
 710                                 WREG32(AVIVO_DC_I2C_DATA, ((p->addr << 1) & 0xff) | 0x1);
 711                                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 712                                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 713                                                                AVIVO_DC_I2C_DATA_COUNT(current_count) |
 714                                                                (prescale << 16)));
 715                                 WREG32(AVIVO_DC_I2C_CONTROL1, reg | AVIVO_DC_I2C_RECEIVE);
 716                                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 717                                 for (j = 0; j < 200; j++) {
 718                                         udelay(50);
 719                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 720                                         if (tmp & AVIVO_DC_I2C_GO)
 721                                                 continue;
 722                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 723                                         if (tmp & AVIVO_DC_I2C_DONE)
 724                                                 break;
 725                                         else {
 726                                                 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
 727                                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 728                                                 ret = -EIO;
 729                                                 goto done;
 730                                         }
 731                                 }
 732                                 for (j = 0; j < current_count; j++)
 733                                         p->buf[buffer_offset + j] = RREG32(AVIVO_DC_I2C_DATA) & 0xff;
 734                                 remaining -= current_count;
 735                                 buffer_offset += current_count;
 736                         }
 737                 } else {
 738                         while (remaining) {
 739                                 if (remaining > 15)
 740                                         current_count = 15;
 741                                 else
 742                                         current_count = remaining;
 743                                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 744                                                               AVIVO_DC_I2C_NACK |
 745                                                               AVIVO_DC_I2C_HALT));
 746                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 747                                 udelay(1);
 748                                 WREG32(AVIVO_DC_I2C_RESET, 0);
 749
 750                                 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
 751                                 for (j = 0; j < current_count; j++)
 752                                         WREG32(AVIVO_DC_I2C_DATA, p->buf[buffer_offset + j]);
 753
 754                                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 755                                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 756                                                                AVIVO_DC_I2C_DATA_COUNT(current_count) |
 757                                                                (prescale << 16)));
 758                                 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
 759                                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 760                                 for (j = 0; j < 200; j++) {
 761                                         udelay(50);
 762                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 763                                         if (tmp & AVIVO_DC_I2C_GO)
 764                                                 continue;
 765                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 766                                         if (tmp & AVIVO_DC_I2C_DONE)
 767                                                 break;
 768                                         else {
 769                                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 770                                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 771                                                 ret = -EIO;
 772                                                 goto done;
 773                                         }
 774                                 }
 775                                 remaining -= current_count;
 776                                 buffer_offset += current_count;
 777                         }
 778                 }
 779         }
 780
 781 done:
 782         WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 783                                       AVIVO_DC_I2C_NACK |
 784                                       AVIVO_DC_I2C_HALT));
 785         WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 786         udelay(1);
 787         WREG32(AVIVO_DC_I2C_RESET, 0);
 788
 789         WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_DONE_USING_I2C);
 790         WREG32(AVIVO_DC_I2C_CONTROL1, saved1);
 791         WREG32(0x494, saved2);
 792         tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 793         tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
 794         WREG32(RADEON_BIOS_6_SCRATCH, tmp);
 795
 796         mutex_unlock(&rdev->pm.mutex);
 797         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 798
 799         return ret;
 800 }
 801
 802 static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 803                               struct i2c_msg *msgs, int num)
 804 {
 805         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 806         struct radeon_device *rdev = i2c->dev->dev_private;
 807         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 808         int ret = 0;
 809
 810         switch (rdev->family) {
 811         case CHIP_R100:
 812         case CHIP_RV100:
 813         case CHIP_RS100:
 814         case CHIP_RV200:
 815         case CHIP_RS200:
 816         case CHIP_R200:
 817         case CHIP_RV250:
 818         case CHIP_RS300:
 819         case CHIP_RV280:
 820         case CHIP_R300:
 821         case CHIP_R350:
 822         case CHIP_RV350:
 823         case CHIP_RV380:
 824         case CHIP_R420:
 825         case CHIP_R423:
 826         case CHIP_RV410:
 827         case CHIP_RS400:
 828         case CHIP_RS480:
 829                 ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
 830                 break;
 831         case CHIP_RS600:
 832         case CHIP_RS690:
 833         case CHIP_RS740:
 834                 /* XXX fill in hw i2c implementation */
 835                 break;
 836         case CHIP_RV515:
 837         case CHIP_R520:
 838         case CHIP_RV530:
 839         case CHIP_RV560:
 840         case CHIP_RV570:
 841         case CHIP_R580:
 842                 if (rec->mm_i2c)
 843                         ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
 844                 else
 845                         ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
 846                 break;
 847         case CHIP_R600:
 848         case CHIP_RV610:
 849         case CHIP_RV630:
 850         case CHIP_RV670:
 851                 /* XXX fill in hw i2c implementation */
 852                 break;
 853         case CHIP_RV620:
 854         case CHIP_RV635:
 855         case CHIP_RS780:
 856         case CHIP_RS880:
 857         case CHIP_RV770:
 858         case CHIP_RV730:
 859         case CHIP_RV710:
 860         case CHIP_RV740:
 861                 /* XXX fill in hw i2c implementation */
 862                 break;
 863         case CHIP_CEDAR:
 864         case CHIP_REDWOOD:
 865         case CHIP_JUNIPER:
 866         case CHIP_CYPRESS:
 867         case CHIP_HEMLOCK:
 868                 /* XXX fill in hw i2c implementation */
 869                 break;
 870         default:
 871                 DRM_ERROR("i2c: unhandled radeon chip\n");
 872                 ret = -EIO;
 873                 break;
 874         }
 875
 876         return ret;
 877 }
 878
 879 static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
 880 {
 881         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 882 }
 883
 884 static const struct i2c_algorithm radeon_i2c_algo = {
 885         .master_xfer = radeon_hw_i2c_xfer,
 886         .functionality = radeon_hw_i2c_func,
 887 };
 888
 889 static const struct i2c_algorithm radeon_atom_i2c_algo = {
 890         .master_xfer = radeon_atom_hw_i2c_xfer,
 891         .functionality = radeon_atom_hw_i2c_func,
 892 };
 893
 894 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 895                                           struct radeon_i2c_bus_rec *rec,
 896                                           const char *name)
 897 {
 898         struct radeon_device *rdev = dev->dev_private;
 899         struct radeon_i2c_chan *i2c;
 900         int ret;
 901
 902         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 903         if (i2c == NULL)
 904                 return NULL;
 905
 906         i2c->rec = *rec;
 907         i2c->adapter.owner = THIS_MODULE;
 908         i2c->adapter.class = I2C_CLASS_DDC;
 909         i2c->adapter.dev.parent = &dev->pdev->dev;
 910         i2c->dev = dev;
 911         i2c_set_adapdata(&i2c->adapter, i2c);
 912         if (rec->mm_i2c ||
 913             (rec->hw_capable &&
 914              radeon_hw_i2c &&
 915              ((rdev->family <= CHIP_RS480) ||
 916               ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
 917                 /* set the radeon hw i2c adapter */
 918                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 919                          "Radeon i2c hw bus %s", name);
 920                 i2c->adapter.algo = &radeon_i2c_algo;
 921                 ret = i2c_add_adapter(&i2c->adapter);
 922                 if (ret) {
 923                         DRM_ERROR("Failed to register hw i2c %s\n", name);
 924                         goto out_free;
 925                 }
 926         } else if (rec->hw_capable &&
 927                    radeon_hw_i2c &&
 928                    ASIC_IS_DCE3(rdev)) {
 929                 /* hw i2c using atom */
 930                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 931                          "Radeon i2c hw bus %s", name);
 932                 i2c->adapter.algo = &radeon_atom_i2c_algo;
 933                 ret = i2c_add_adapter(&i2c->adapter);
 934                 if (ret) {
 935                         DRM_ERROR("Failed to register hw i2c %s\n", name);
 936                         goto out_free;
 937                 }
 938         } else {
 939                 /* set the radeon bit adapter */
 940                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 941                          "Radeon i2c bit bus %s", name);
 942                 i2c->adapter.algo_data = &i2c->algo.bit;
 943                 i2c->algo.bit.pre_xfer = pre_xfer;
 944                 i2c->algo.bit.post_xfer = post_xfer;
 945                 i2c->algo.bit.setsda = set_data;
 946                 i2c->algo.bit.setscl = set_clock;
 947                 i2c->algo.bit.getsda = get_data;
 948                 i2c->algo.bit.getscl = get_clock;
 949                 i2c->algo.bit.udelay = 10;
 950                 i2c->algo.bit.timeout = usecs_to_jiffies(2200); /* from VESA */
 951                 i2c->algo.bit.data = i2c;
 952                 ret = i2c_bit_add_bus(&i2c->adapter);
 953                 if (ret) {
 954                         DRM_ERROR("Failed to register bit i2c %s\n", name);
 955                         goto out_free;
 956                 }
 957         }
 958
 959         return i2c;
 960 out_free:
 961         kfree(i2c);
 962         return NULL;
 963
 964 }
 965
 966 struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
 967                                              struct radeon_i2c_bus_rec *rec,
 968                                              const char *name)
 969 {
 970         struct radeon_i2c_chan *i2c;
 971         int ret;
 972
 973         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 974         if (i2c == NULL)
 975                 return NULL;
 976
 977         i2c->rec = *rec;
 978         i2c->adapter.owner = THIS_MODULE;
 979         i2c->adapter.class = I2C_CLASS_DDC;
 980         i2c->adapter.dev.parent = &dev->pdev->dev;
 981         i2c->dev = dev;
 982         snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 983                  "Radeon aux bus %s", name);
 984         i2c_set_adapdata(&i2c->adapter, i2c);
 985         i2c->adapter.algo_data = &i2c->algo.dp;
 986         i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
 987         i2c->algo.dp.address = 0;
 988         ret = i2c_dp_aux_add_bus(&i2c->adapter);
 989         if (ret) {
 990                 DRM_INFO("Failed to register i2c %s\n", name);
 991                 goto out_free;
 992         }
 993
 994         return i2c;
 995 out_free:
 996         kfree(i2c);
 997         return NULL;
 998
 999 }
1000
1001 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
1002 {
1003         if (!i2c)
1004                 return;
1005         i2c_del_adapter(&i2c->adapter);
1006         kfree(i2c);
1007 }
1008
1009 /* Add the default buses */
1010 void radeon_i2c_init(struct radeon_device *rdev)
1011 {
1012         if (rdev->is_atom_bios)
1013                 radeon_atombios_i2c_init(rdev);
1014         else
1015                 radeon_combios_i2c_init(rdev);
1016 }
1017
1018 /* remove all the buses */
1019 void radeon_i2c_fini(struct radeon_device *rdev)
1020 {
1021         int i;
1022
1023         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1024                 if (rdev->i2c_bus[i]) {
1025                         radeon_i2c_destroy(rdev->i2c_bus[i]);
1026                         rdev->i2c_bus[i] = NULL;
1027                 }
1028         }
1029 }
1030
1031 /* Add additional buses */
1032 void radeon_i2c_add(struct radeon_device *rdev,
1033                     struct radeon_i2c_bus_rec *rec,
1034                     const char *name)
1035 {
1036         struct drm_device *dev = rdev->ddev;
1037         int i;
1038
1039         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1040                 if (!rdev->i2c_bus[i]) {
1041                         rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
1042                         return;
1043                 }
1044         }
1045 }
1046
1047 /* looks up bus based on id */
1048 struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
1049                                           struct radeon_i2c_bus_rec *i2c_bus)
1050 {
1051         int i;
1052
1053         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1054                 if (rdev->i2c_bus[i] &&
1055                     (rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
1056                         return rdev->i2c_bus[i];
1057                 }
1058         }
1059         return NULL;
1060 }
1061
1062 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
1063 {
1064         return NULL;
1065 }
1066
1067 void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
1068                          u8 slave_addr,
1069                          u8 addr,
1070                          u8 *val)
1071 {
1072         u8 out_buf[2];
1073         u8 in_buf[2];
1074         struct i2c_msg msgs[] = {
1075                 {
1076                         .addr = slave_addr,
1077                         .flags = 0,
1078                         .len = 1,
1079                         .buf = out_buf,
1080                 },
1081                 {
1082                         .addr = slave_addr,
1083                         .flags = I2C_M_RD,
1084                         .len = 1,
1085                         .buf = in_buf,
1086                 }
1087         };
1088
1089         out_buf[0] = addr;
1090         out_buf[1] = 0;
1091
1092         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
1093                 *val = in_buf[0];
1094                 DRM_DEBUG("val = 0x%02x\n", *val);
1095         } else {
1096                 DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
1097                           addr, *val);
1098         }
1099 }
1100
1101 void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
1102                          u8 slave_addr,
1103                          u8 addr,
1104                          u8 val)
1105 {
1106         uint8_t out_buf[2];
1107         struct i2c_msg msg = {
1108                 .addr = slave_addr,
1109                 .flags = 0,
1110                 .len = 2,
1111                 .buf = out_buf,
1112         };
1113
1114         out_buf[0] = addr;
1115         out_buf[1] = val;
1116
1117         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
1118                 DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
1119                           addr, val);
1120 }
1121
1122 /* ddc router switching */
1123 void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
1124 {
1125         u8 val;
1126
1127         if (!radeon_connector->router.ddc_valid)
1128                 return;
1129
1130         if (!radeon_connector->router_bus)
1131                 return;
1132
1133         radeon_i2c_get_byte(radeon_connector->router_bus,
1134                             radeon_connector->router.i2c_addr,
1135                             0x3, &val);
1136         val &= ~radeon_connector->router.ddc_mux_control_pin;
1137         radeon_i2c_put_byte(radeon_connector->router_bus,
1138                             radeon_connector->router.i2c_addr,
1139                             0x3, val);
1140         radeon_i2c_get_byte(radeon_connector->router_bus,
1141                             radeon_connector->router.i2c_addr,
1142                             0x1, &val);
1143         val &= ~radeon_connector->router.ddc_mux_control_pin;
1144         val |= radeon_connector->router.ddc_mux_state;
1145         radeon_i2c_put_byte(radeon_connector->router_bus,
1146                             radeon_connector->router.i2c_addr,
1147                             0x1, val);
1148 }
1149
1150 /* clock/data router switching */
1151 void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
1152 {
1153         u8 val;
1154
1155         if (!radeon_connector->router.cd_valid)
1156                 return;
1157
1158         if (!radeon_connector->router_bus)
1159                 return;
1160
1161         radeon_i2c_get_byte(radeon_connector->router_bus,
1162                             radeon_connector->router.i2c_addr,
1163                             0x3, &val);
1164         val &= ~radeon_connector->router.cd_mux_control_pin;
1165         radeon_i2c_put_byte(radeon_connector->router_bus,
1166                             radeon_connector->router.i2c_addr,
1167                             0x3, val);
1168         radeon_i2c_get_byte(radeon_connector->router_bus,
1169                             radeon_connector->router.i2c_addr,
1170                             0x1, &val);
1171         val &= ~radeon_connector->router.cd_mux_control_pin;
1172         val |= radeon_connector->router.cd_mux_state;
1173         radeon_i2c_put_byte(radeon_connector->router_bus,
1174                             radeon_connector->router.i2c_addr,
1175                             0x1, val);
1176 }
1177