sys/dev/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 <drm/drmP.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/radeon_drm.h>
  31 #include "radeon.h"
  32 #include "atom.h"
  33
  34 extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
  35                                    struct i2c_msg *msgs, int num);
  36 extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
  37
  38 /**
  39  * radeon_ddc_probe
  40  *
  41  */
  42 bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
  43 {
  44         u8 out = 0x0;
  45         u8 buf[8];
  46         int ret;
  47         struct i2c_msg msgs[] = {
  48                 {
  49                         .addr = DDC_ADDR,
  50                         .flags = 0,
  51                         .len = 1,
  52                         .buf = &out,
  53                 },
  54                 {
  55                         .addr = DDC_ADDR,
  56                         .flags = I2C_M_RD,
  57                         .len = 8,
  58                         .buf = buf,
  59                 }
  60         };
  61
  62         /* on hw with routers, select right port */
  63         if (radeon_connector->router.ddc_valid)
  64                 radeon_router_select_ddc_port(radeon_connector);
  65
  66         if (use_aux) {
  67                 ret = i2c_transfer(&radeon_connector->ddc_bus->aux.ddc, msgs, 2);
  68         } else {
  69                 ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
  70         }
  71
  72         if (ret != 2)
  73                 /* Couldn't find an accessible DDC on this connector */
  74                 return false;
  75         /* Probe also for valid EDID header
  76          * EDID header starts with:
  77          * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
  78          * Only the first 6 bytes must be valid as
  79          * drm_edid_block_valid() can fix the last 2 bytes */
  80         if (drm_edid_header_is_valid(buf) < 6) {
  81                 /* Couldn't find an accessible EDID on this
  82                  * connector */
  83                 return false;
  84         }
  85         return true;
  86 }
  87
  88 /* bit banging i2c */
  89
  90 static int pre_xfer(struct i2c_adapter *i2c_adap)
  91 {
  92         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
  93         struct radeon_device *rdev = i2c->dev->dev_private;
  94         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  95         uint32_t temp;
  96
  97         mutex_lock(&i2c->mutex);
  98
  99         /* RV410 appears to have a bug where the hw i2c in reset
 100          * holds the i2c port in a bad state - switch hw i2c away before
 101          * doing DDC - do this for all r200s/r300s/r400s for safety sake
 102          */
 103         if (rec->hw_capable) {
 104                 if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
 105                         u32 reg;
 106
 107                         if (rdev->family >= CHIP_RV350)
 108                                 reg = RADEON_GPIO_MONID;
 109                         else if ((rdev->family == CHIP_R300) ||
 110                                  (rdev->family == CHIP_R350))
 111                                 reg = RADEON_GPIO_DVI_DDC;
 112                         else
 113                                 reg = RADEON_GPIO_CRT2_DDC;
 114
 115                         mutex_lock(&rdev->dc_hw_i2c_mutex);
 116                         if (rec->a_clk_reg == reg) {
 117                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
 118                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
 119                         } else {
 120                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
 121                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
 122                         }
 123                         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 124                 }
 125         }
 126
 127         /* switch the pads to ddc mode */
 128         if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
 129                 temp = RREG32(rec->mask_clk_reg);
 130                 temp &= ~(1 << 16);
 131                 WREG32(rec->mask_clk_reg, temp);
 132         }
 133
 134         /* clear the output pin values */
 135         temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
 136         WREG32(rec->a_clk_reg, temp);
 137
 138         temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
 139         WREG32(rec->a_data_reg, temp);
 140
 141         /* set the pins to input */
 142         temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 143         WREG32(rec->en_clk_reg, temp);
 144
 145         temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 146         WREG32(rec->en_data_reg, temp);
 147
 148         /* mask the gpio pins for software use */
 149         temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
 150         WREG32(rec->mask_clk_reg, temp);
 151         temp = RREG32(rec->mask_clk_reg);
 152
 153         temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
 154         WREG32(rec->mask_data_reg, temp);
 155         temp = RREG32(rec->mask_data_reg);
 156
 157         return 0;
 158 }
 159
 160 static void post_xfer(struct i2c_adapter *i2c_adap)
 161 {
 162         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 163         struct radeon_device *rdev = i2c->dev->dev_private;
 164         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 165         uint32_t temp;
 166
 167         /* unmask the gpio pins for software use */
 168         temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
 169         WREG32(rec->mask_clk_reg, temp);
 170         temp = RREG32(rec->mask_clk_reg);
 171
 172         temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
 173         WREG32(rec->mask_data_reg, temp);
 174         temp = RREG32(rec->mask_data_reg);
 175
 176         mutex_unlock(&i2c->mutex);
 177 }
 178
 179 static int get_clock(void *i2c_priv)
 180 {
 181         struct radeon_i2c_chan *i2c = i2c_priv;
 182         struct radeon_device *rdev = i2c->dev->dev_private;
 183         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 184         uint32_t val;
 185
 186         /* read the value off the pin */
 187         val = RREG32(rec->y_clk_reg);
 188         val &= rec->y_clk_mask;
 189
 190         return (val != 0);
 191 }
 192
 193
 194 static int get_data(void *i2c_priv)
 195 {
 196         struct radeon_i2c_chan *i2c = i2c_priv;
 197         struct radeon_device *rdev = i2c->dev->dev_private;
 198         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 199         uint32_t val;
 200
 201         /* read the value off the pin */
 202         val = RREG32(rec->y_data_reg);
 203         val &= rec->y_data_mask;
 204
 205         return (val != 0);
 206 }
 207
 208 static void set_clock(void *i2c_priv, int clock)
 209 {
 210         struct radeon_i2c_chan *i2c = i2c_priv;
 211         struct radeon_device *rdev = i2c->dev->dev_private;
 212         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 213         uint32_t val;
 214
 215         /* set pin direction */
 216         val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 217         val |= clock ? 0 : rec->en_clk_mask;
 218         WREG32(rec->en_clk_reg, val);
 219 }
 220
 221 static void set_data(void *i2c_priv, int data)
 222 {
 223         struct radeon_i2c_chan *i2c = i2c_priv;
 224         struct radeon_device *rdev = i2c->dev->dev_private;
 225         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 226         uint32_t val;
 227
 228         /* set pin direction */
 229         val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 230         val |= data ? 0 : rec->en_data_mask;
 231         WREG32(rec->en_data_reg, val);
 232 }
 233
 234 /* hw i2c */
 235
 236 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
 237 {
 238         u32 sclk = rdev->pm.current_sclk;
 239         u32 prescale = 0;
 240         u32 nm;
 241         u8 n, m, loop;
 242         int i2c_clock;
 243
 244         switch (rdev->family) {
 245         case CHIP_R100:
 246         case CHIP_RV100:
 247         case CHIP_RS100:
 248         case CHIP_RV200:
 249         case CHIP_RS200:
 250         case CHIP_R200:
 251         case CHIP_RV250:
 252         case CHIP_RS300:
 253         case CHIP_RV280:
 254         case CHIP_R300:
 255         case CHIP_R350:
 256         case CHIP_RV350:
 257                 i2c_clock = 60;
 258                 nm = (sclk * 10) / (i2c_clock * 4);
 259                 for (loop = 1; loop < 255; loop++) {
 260                         if ((nm / loop) < loop)
 261                                 break;
 262                 }
 263                 n = loop - 1;
 264                 m = loop - 2;
 265                 prescale = m | (n << 8);
 266                 break;
 267         case CHIP_RV380:
 268         case CHIP_RS400:
 269         case CHIP_RS480:
 270         case CHIP_R420:
 271         case CHIP_R423:
 272         case CHIP_RV410:
 273                 prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
 274                 break;
 275         case CHIP_RS600:
 276         case CHIP_RS690:
 277         case CHIP_RS740:
 278                 /* todo */
 279                 break;
 280         case CHIP_RV515:
 281         case CHIP_R520:
 282         case CHIP_RV530:
 283         case CHIP_RV560:
 284         case CHIP_RV570:
 285         case CHIP_R580:
 286                 i2c_clock = 50;
 287                 if (rdev->family == CHIP_R520)
 288                         prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
 289                 else
 290                         prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
 291                 break;
 292         case CHIP_R600:
 293         case CHIP_RV610:
 294         case CHIP_RV630:
 295         case CHIP_RV670:
 296                 /* todo */
 297                 break;
 298         case CHIP_RV620:
 299         case CHIP_RV635:
 300         case CHIP_RS780:
 301         case CHIP_RS880:
 302         case CHIP_RV770:
 303         case CHIP_RV730:
 304         case CHIP_RV710:
 305         case CHIP_RV740:
 306                 /* todo */
 307                 break;
 308         case CHIP_CEDAR:
 309         case CHIP_REDWOOD:
 310         case CHIP_JUNIPER:
 311         case CHIP_CYPRESS:
 312         case CHIP_HEMLOCK:
 313                 /* todo */
 314                 break;
 315         default:
 316                 DRM_ERROR("i2c: unhandled radeon chip\n");
 317                 break;
 318         }
 319         return prescale;
 320 }
 321
 322
 323 /* hw i2c engine for r1xx-4xx hardware
 324  * hw can buffer up to 15 bytes
 325  */
 326 static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 327                             struct i2c_msg *msgs, int num)
 328 {
 329         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 330         struct radeon_device *rdev = i2c->dev->dev_private;
 331         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 332         struct i2c_msg *p;
 333         int i, j, k, ret = num;
 334         u32 prescale;
 335         u32 i2c_cntl_0, i2c_cntl_1, i2c_data;
 336         u32 tmp, reg;
 337
 338         mutex_lock(&rdev->dc_hw_i2c_mutex);
 339         /* take the pm lock since we need a constant sclk */
 340         mutex_lock(&rdev->pm.mutex);
 341
 342         prescale = radeon_get_i2c_prescale(rdev);
 343
 344         reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
 345                RADEON_I2C_DRIVE_EN |
 346                RADEON_I2C_START |
 347                RADEON_I2C_STOP |
 348                RADEON_I2C_GO);
 349
 350         if (rdev->is_atom_bios) {
 351                 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 352                 WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
 353         }
 354
 355         if (rec->mm_i2c) {
 356                 i2c_cntl_0 = RADEON_I2C_CNTL_0;
 357                 i2c_cntl_1 = RADEON_I2C_CNTL_1;
 358                 i2c_data = RADEON_I2C_DATA;
 359         } else {
 360                 i2c_cntl_0 = RADEON_DVI_I2C_CNTL_0;
 361                 i2c_cntl_1 = RADEON_DVI_I2C_CNTL_1;
 362                 i2c_data = RADEON_DVI_I2C_DATA;
 363
 364                 switch (rdev->family) {
 365                 case CHIP_R100:
 366                 case CHIP_RV100:
 367                 case CHIP_RS100:
 368                 case CHIP_RV200:
 369                 case CHIP_RS200:
 370                 case CHIP_RS300:
 371                         switch (rec->mask_clk_reg) {
 372                         case RADEON_GPIO_DVI_DDC:
 373                                 /* no gpio select bit */
 374                                 break;
 375                         default:
 376                                 DRM_ERROR("gpio not supported with hw i2c\n");
 377                                 ret = -EINVAL;
 378                                 goto done;
 379                         }
 380                         break;
 381                 case CHIP_R200:
 382                         /* only bit 4 on r200 */
 383                         switch (rec->mask_clk_reg) {
 384                         case RADEON_GPIO_DVI_DDC:
 385                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 386                                 break;
 387                         case RADEON_GPIO_MONID:
 388                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 389                                 break;
 390                         default:
 391                                 DRM_ERROR("gpio not supported with hw i2c\n");
 392                                 ret = -EINVAL;
 393                                 goto done;
 394                         }
 395                         break;
 396                 case CHIP_RV250:
 397                 case CHIP_RV280:
 398                         /* bits 3 and 4 */
 399                         switch (rec->mask_clk_reg) {
 400                         case RADEON_GPIO_DVI_DDC:
 401                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 402                                 break;
 403                         case RADEON_GPIO_VGA_DDC:
 404                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
 405                                 break;
 406                         case RADEON_GPIO_CRT2_DDC:
 407                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 408                                 break;
 409                         default:
 410                                 DRM_ERROR("gpio not supported with hw i2c\n");
 411                                 ret = -EINVAL;
 412                                 goto done;
 413                         }
 414                         break;
 415                 case CHIP_R300:
 416                 case CHIP_R350:
 417                         /* only bit 4 on r300/r350 */
 418                         switch (rec->mask_clk_reg) {
 419                         case RADEON_GPIO_VGA_DDC:
 420                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 421                                 break;
 422                         case RADEON_GPIO_DVI_DDC:
 423                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 424                                 break;
 425                         default:
 426                                 DRM_ERROR("gpio not supported with hw i2c\n");
 427                                 ret = -EINVAL;
 428                                 goto done;
 429                         }
 430                         break;
 431                 case CHIP_RV350:
 432                 case CHIP_RV380:
 433                 case CHIP_R420:
 434                 case CHIP_R423:
 435                 case CHIP_RV410:
 436                 case CHIP_RS400:
 437                 case CHIP_RS480:
 438                         /* bits 3 and 4 */
 439                         switch (rec->mask_clk_reg) {
 440                         case RADEON_GPIO_VGA_DDC:
 441                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
 442                                 break;
 443                         case RADEON_GPIO_DVI_DDC:
 444                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
 445                                 break;
 446                         case RADEON_GPIO_MONID:
 447                                 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
 448                                 break;
 449                         default:
 450                                 DRM_ERROR("gpio not supported with hw i2c\n");
 451                                 ret = -EINVAL;
 452                                 goto done;
 453                         }
 454                         break;
 455                 default:
 456                         DRM_ERROR("unsupported asic\n");
 457                         ret = -EINVAL;
 458                         goto done;
 459                         break;
 460                 }
 461         }
 462
 463         /* check for bus probe */
 464         p = &msgs[0];
 465         if ((num == 1) && (p->len == 0)) {
 466                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 467                                     RADEON_I2C_NACK |
 468                                     RADEON_I2C_HALT |
 469                                     RADEON_I2C_SOFT_RST));
 470                 WREG32(i2c_data, (p->addr << 1) & 0xff);
 471                 WREG32(i2c_data, 0);
 472                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 473                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 474                                     RADEON_I2C_EN |
 475                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 476                 WREG32(i2c_cntl_0, reg);
 477                 for (k = 0; k < 32; k++) {
 478                         udelay(10);
 479                         tmp = RREG32(i2c_cntl_0);
 480                         if (tmp & RADEON_I2C_GO)
 481                                 continue;
 482                         tmp = RREG32(i2c_cntl_0);
 483                         if (tmp & RADEON_I2C_DONE)
 484                                 break;
 485                         else {
 486                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 487                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 488                                 ret = -EIO;
 489                                 goto done;
 490                         }
 491                 }
 492                 goto done;
 493         }
 494
 495         for (i = 0; i < num; i++) {
 496                 p = &msgs[i];
 497                 for (j = 0; j < p->len; j++) {
 498                         if (p->flags & I2C_M_RD) {
 499                                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 500                                                     RADEON_I2C_NACK |
 501                                                     RADEON_I2C_HALT |
 502                                                     RADEON_I2C_SOFT_RST));
 503                                 WREG32(i2c_data, ((p->addr << 1) & 0xff) | 0x1);
 504                                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 505                                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 506                                                     RADEON_I2C_EN |
 507                                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 508                                 WREG32(i2c_cntl_0, reg | RADEON_I2C_RECEIVE);
 509                                 for (k = 0; k < 32; k++) {
 510                                         udelay(10);
 511                                         tmp = RREG32(i2c_cntl_0);
 512                                         if (tmp & RADEON_I2C_GO)
 513                                                 continue;
 514                                         tmp = RREG32(i2c_cntl_0);
 515                                         if (tmp & RADEON_I2C_DONE)
 516                                                 break;
 517                                         else {
 518                                                 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
 519                                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 520                                                 ret = -EIO;
 521                                                 goto done;
 522                                         }
 523                                 }
 524                                 p->buf[j] = RREG32(i2c_data) & 0xff;
 525                         } else {
 526                                 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 527                                                     RADEON_I2C_NACK |
 528                                                     RADEON_I2C_HALT |
 529                                                     RADEON_I2C_SOFT_RST));
 530                                 WREG32(i2c_data, (p->addr << 1) & 0xff);
 531                                 WREG32(i2c_data, p->buf[j]);
 532                                 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
 533                                                     (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
 534                                                     RADEON_I2C_EN |
 535                                                     (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
 536                                 WREG32(i2c_cntl_0, reg);
 537                                 for (k = 0; k < 32; k++) {
 538                                         udelay(10);
 539                                         tmp = RREG32(i2c_cntl_0);
 540                                         if (tmp & RADEON_I2C_GO)
 541                                                 continue;
 542                                         tmp = RREG32(i2c_cntl_0);
 543                                         if (tmp & RADEON_I2C_DONE)
 544                                                 break;
 545                                         else {
 546                                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 547                                                 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
 548                                                 ret = -EIO;
 549                                                 goto done;
 550                                         }
 551                                 }
 552                         }
 553                 }
 554         }
 555
 556 done:
 557         WREG32(i2c_cntl_0, 0);
 558         WREG32(i2c_cntl_1, 0);
 559         WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
 560                             RADEON_I2C_NACK |
 561                             RADEON_I2C_HALT |
 562                             RADEON_I2C_SOFT_RST));
 563
 564         if (rdev->is_atom_bios) {
 565                 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 566                 tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
 567                 WREG32(RADEON_BIOS_6_SCRATCH, tmp);
 568         }
 569
 570         mutex_unlock(&rdev->pm.mutex);
 571         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 572
 573         return ret;
 574 }
 575
 576 /* hw i2c engine for r5xx hardware
 577  * hw can buffer up to 15 bytes
 578  */
 579 static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 580                             struct i2c_msg *msgs, int num)
 581 {
 582         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 583         struct radeon_device *rdev = i2c->dev->dev_private;
 584         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 585         struct i2c_msg *p;
 586         int i, j, remaining, current_count, buffer_offset, ret = num;
 587         u32 prescale;
 588         u32 tmp, reg;
 589         u32 saved1, saved2;
 590
 591         mutex_lock(&rdev->dc_hw_i2c_mutex);
 592         /* take the pm lock since we need a constant sclk */
 593         mutex_lock(&rdev->pm.mutex);
 594
 595         prescale = radeon_get_i2c_prescale(rdev);
 596
 597         /* clear gpio mask bits */
 598         tmp = RREG32(rec->mask_clk_reg);
 599         tmp &= ~rec->mask_clk_mask;
 600         WREG32(rec->mask_clk_reg, tmp);
 601         tmp = RREG32(rec->mask_clk_reg);
 602
 603         tmp = RREG32(rec->mask_data_reg);
 604         tmp &= ~rec->mask_data_mask;
 605         WREG32(rec->mask_data_reg, tmp);
 606         tmp = RREG32(rec->mask_data_reg);
 607
 608         /* clear pin values */
 609         tmp = RREG32(rec->a_clk_reg);
 610         tmp &= ~rec->a_clk_mask;
 611         WREG32(rec->a_clk_reg, tmp);
 612         tmp = RREG32(rec->a_clk_reg);
 613
 614         tmp = RREG32(rec->a_data_reg);
 615         tmp &= ~rec->a_data_mask;
 616         WREG32(rec->a_data_reg, tmp);
 617         tmp = RREG32(rec->a_data_reg);
 618
 619         /* set the pins to input */
 620         tmp = RREG32(rec->en_clk_reg);
 621         tmp &= ~rec->en_clk_mask;
 622         WREG32(rec->en_clk_reg, tmp);
 623         tmp = RREG32(rec->en_clk_reg);
 624
 625         tmp = RREG32(rec->en_data_reg);
 626         tmp &= ~rec->en_data_mask;
 627         WREG32(rec->en_data_reg, tmp);
 628         tmp = RREG32(rec->en_data_reg);
 629
 630         /* */
 631         tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 632         WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
 633         saved1 = RREG32(AVIVO_DC_I2C_CONTROL1);
 634         saved2 = RREG32(0x494);
 635         WREG32(0x494, saved2 | 0x1);
 636
 637         WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_WANTS_TO_USE_I2C);
 638         for (i = 0; i < 50; i++) {
 639                 udelay(1);
 640                 if (RREG32(AVIVO_DC_I2C_ARBITRATION) & AVIVO_DC_I2C_SW_CAN_USE_I2C)
 641                         break;
 642         }
 643         if (i == 50) {
 644                 DRM_ERROR("failed to get i2c bus\n");
 645                 ret = -EBUSY;
 646                 goto done;
 647         }
 648
 649         reg = AVIVO_DC_I2C_START | AVIVO_DC_I2C_STOP | AVIVO_DC_I2C_EN;
 650         switch (rec->mask_clk_reg) {
 651         case AVIVO_DC_GPIO_DDC1_MASK:
 652                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC1);
 653                 break;
 654         case AVIVO_DC_GPIO_DDC2_MASK:
 655                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC2);
 656                 break;
 657         case AVIVO_DC_GPIO_DDC3_MASK:
 658                 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC3);
 659                 break;
 660         default:
 661                 DRM_ERROR("gpio not supported with hw i2c\n");
 662                 ret = -EINVAL;
 663                 goto done;
 664         }
 665
 666         /* check for bus probe */
 667         p = &msgs[0];
 668         if ((num == 1) && (p->len == 0)) {
 669                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 670                                               AVIVO_DC_I2C_NACK |
 671                                               AVIVO_DC_I2C_HALT));
 672                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 673                 udelay(1);
 674                 WREG32(AVIVO_DC_I2C_RESET, 0);
 675
 676                 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
 677                 WREG32(AVIVO_DC_I2C_DATA, 0);
 678
 679                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 680                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 681                                                AVIVO_DC_I2C_DATA_COUNT(1) |
 682                                                (prescale << 16)));
 683                 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
 684                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 685                 for (j = 0; j < 200; j++) {
 686                         udelay(50);
 687                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 688                         if (tmp & AVIVO_DC_I2C_GO)
 689                                 continue;
 690                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 691                         if (tmp & AVIVO_DC_I2C_DONE)
 692                                 break;
 693                         else {
 694                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 695                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 696                                 ret = -EIO;
 697                                 goto done;
 698                         }
 699                 }
 700                 goto done;
 701         }
 702
 703         for (i = 0; i < num; i++) {
 704                 p = &msgs[i];
 705                 remaining = p->len;
 706                 buffer_offset = 0;
 707                 if (p->flags & I2C_M_RD) {
 708                         while (remaining) {
 709                                 if (remaining > 15)
 710                                         current_count = 15;
 711                                 else
 712                                         current_count = remaining;
 713                                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 714                                                               AVIVO_DC_I2C_NACK |
 715                                                               AVIVO_DC_I2C_HALT));
 716                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 717                                 udelay(1);
 718                                 WREG32(AVIVO_DC_I2C_RESET, 0);
 719
 720                                 WREG32(AVIVO_DC_I2C_DATA, ((p->addr << 1) & 0xff) | 0x1);
 721                                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 722                                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 723                                                                AVIVO_DC_I2C_DATA_COUNT(current_count) |
 724                                                                (prescale << 16)));
 725                                 WREG32(AVIVO_DC_I2C_CONTROL1, reg | AVIVO_DC_I2C_RECEIVE);
 726                                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 727                                 for (j = 0; j < 200; j++) {
 728                                         udelay(50);
 729                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 730                                         if (tmp & AVIVO_DC_I2C_GO)
 731                                                 continue;
 732                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 733                                         if (tmp & AVIVO_DC_I2C_DONE)
 734                                                 break;
 735                                         else {
 736                                                 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
 737                                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 738                                                 ret = -EIO;
 739                                                 goto done;
 740                                         }
 741                                 }
 742                                 for (j = 0; j < current_count; j++)
 743                                         p->buf[buffer_offset + j] = RREG32(AVIVO_DC_I2C_DATA) & 0xff;
 744                                 remaining -= current_count;
 745                                 buffer_offset += current_count;
 746                         }
 747                 } else {
 748                         while (remaining) {
 749                                 if (remaining > 15)
 750                                         current_count = 15;
 751                                 else
 752                                         current_count = remaining;
 753                                 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 754                                                               AVIVO_DC_I2C_NACK |
 755                                                               AVIVO_DC_I2C_HALT));
 756                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 757                                 udelay(1);
 758                                 WREG32(AVIVO_DC_I2C_RESET, 0);
 759
 760                                 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
 761                                 for (j = 0; j < current_count; j++)
 762                                         WREG32(AVIVO_DC_I2C_DATA, p->buf[buffer_offset + j]);
 763
 764                                 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
 765                                 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
 766                                                                AVIVO_DC_I2C_DATA_COUNT(current_count) |
 767                                                                (prescale << 16)));
 768                                 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
 769                                 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
 770                                 for (j = 0; j < 200; j++) {
 771                                         udelay(50);
 772                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 773                                         if (tmp & AVIVO_DC_I2C_GO)
 774                                                 continue;
 775                                         tmp = RREG32(AVIVO_DC_I2C_STATUS1);
 776                                         if (tmp & AVIVO_DC_I2C_DONE)
 777                                                 break;
 778                                         else {
 779                                                 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
 780                                                 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
 781                                                 ret = -EIO;
 782                                                 goto done;
 783                                         }
 784                                 }
 785                                 remaining -= current_count;
 786                                 buffer_offset += current_count;
 787                         }
 788                 }
 789         }
 790
 791 done:
 792         WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
 793                                       AVIVO_DC_I2C_NACK |
 794                                       AVIVO_DC_I2C_HALT));
 795         WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
 796         udelay(1);
 797         WREG32(AVIVO_DC_I2C_RESET, 0);
 798
 799         WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_DONE_USING_I2C);
 800         WREG32(AVIVO_DC_I2C_CONTROL1, saved1);
 801         WREG32(0x494, saved2);
 802         tmp = RREG32(RADEON_BIOS_6_SCRATCH);
 803         tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
 804         WREG32(RADEON_BIOS_6_SCRATCH, tmp);
 805
 806         mutex_unlock(&rdev->pm.mutex);
 807         mutex_unlock(&rdev->dc_hw_i2c_mutex);
 808
 809         return ret;
 810 }
 811
 812 static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
 813                               struct i2c_msg *msgs, int num)
 814 {
 815         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 816         struct radeon_device *rdev = i2c->dev->dev_private;
 817         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 818         int ret = 0;
 819
 820         mutex_lock(&i2c->mutex);
 821
 822         switch (rdev->family) {
 823         case CHIP_R100:
 824         case CHIP_RV100:
 825         case CHIP_RS100:
 826         case CHIP_RV200:
 827         case CHIP_RS200:
 828         case CHIP_R200:
 829         case CHIP_RV250:
 830         case CHIP_RS300:
 831         case CHIP_RV280:
 832         case CHIP_R300:
 833         case CHIP_R350:
 834         case CHIP_RV350:
 835         case CHIP_RV380:
 836         case CHIP_R420:
 837         case CHIP_R423:
 838         case CHIP_RV410:
 839         case CHIP_RS400:
 840         case CHIP_RS480:
 841                 ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
 842                 break;
 843         case CHIP_RS600:
 844         case CHIP_RS690:
 845         case CHIP_RS740:
 846                 /* XXX fill in hw i2c implementation */
 847                 break;
 848         case CHIP_RV515:
 849         case CHIP_R520:
 850         case CHIP_RV530:
 851         case CHIP_RV560:
 852         case CHIP_RV570:
 853         case CHIP_R580:
 854                 if (rec->mm_i2c)
 855                         ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
 856                 else
 857                         ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
 858                 break;
 859         case CHIP_R600:
 860         case CHIP_RV610:
 861         case CHIP_RV630:
 862         case CHIP_RV670:
 863                 /* XXX fill in hw i2c implementation */
 864                 break;
 865         case CHIP_RV620:
 866         case CHIP_RV635:
 867         case CHIP_RS780:
 868         case CHIP_RS880:
 869         case CHIP_RV770:
 870         case CHIP_RV730:
 871         case CHIP_RV710:
 872         case CHIP_RV740:
 873                 /* XXX fill in hw i2c implementation */
 874                 break;
 875         case CHIP_CEDAR:
 876         case CHIP_REDWOOD:
 877         case CHIP_JUNIPER:
 878         case CHIP_CYPRESS:
 879         case CHIP_HEMLOCK:
 880                 /* XXX fill in hw i2c implementation */
 881                 break;
 882         default:
 883                 DRM_ERROR("i2c: unhandled radeon chip\n");
 884                 ret = -EIO;
 885                 break;
 886         }
 887
 888         mutex_unlock(&i2c->mutex);
 889
 890         return ret;
 891 }
 892
 893 static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
 894 {
 895         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 896 }
 897
 898 static const struct i2c_algorithm radeon_i2c_algo = {
 899         .master_xfer = radeon_hw_i2c_xfer,
 900         .functionality = radeon_hw_i2c_func,
 901 };
 902
 903 static const struct i2c_algorithm radeon_atom_i2c_algo = {
 904         .master_xfer = radeon_atom_hw_i2c_xfer,
 905         .functionality = radeon_atom_hw_i2c_func,
 906 };
 907
 908 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 909                                           struct radeon_i2c_bus_rec *rec,
 910                                           const char *name)
 911 {
 912         struct radeon_device *rdev = dev->dev_private;
 913         struct radeon_i2c_chan *i2c;
 914         int ret;
 915
 916         /* don't add the mm_i2c bus unless hw_i2c is enabled */
 917         if (rec->mm_i2c && (radeon_hw_i2c == 0))
 918                 return NULL;
 919
 920         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 921         if (i2c == NULL)
 922                 return NULL;
 923
 924         i2c->rec = *rec;
 925 #if 0
 926         i2c->adapter.owner = THIS_MODULE;
 927         i2c->adapter.class = I2C_CLASS_DDC;
 928 #endif
 929         i2c->adapter.dev.parent = &dev->pdev->dev;
 930         i2c->dev = dev;
 931         i2c_set_adapdata(&i2c->adapter, i2c);
 932         lockinit(&i2c->mutex, "ri2cmtx", 0, LK_CANRECURSE);
 933         if (rec->mm_i2c ||
 934             (rec->hw_capable &&
 935              radeon_hw_i2c &&
 936              ((rdev->family <= CHIP_RS480) ||
 937               ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
 938                 /* set the radeon hw i2c adapter */
 939                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 940                          "Radeon i2c hw bus %s", name);
 941                 i2c->adapter.algo = &radeon_i2c_algo;
 942                 ret = i2c_add_adapter(&i2c->adapter);
 943                 if (ret) {
 944                         DRM_ERROR("Failed to register hw i2c %s\n", name);
 945                         goto out_free;
 946                 }
 947         } else if (rec->hw_capable &&
 948                    radeon_hw_i2c &&
 949                    ASIC_IS_DCE3(rdev)) {
 950                 /* hw i2c using atom */
 951                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 952                          "Radeon i2c hw bus %s", name);
 953                 i2c->adapter.algo = &radeon_atom_i2c_algo;
 954                 ret = i2c_add_adapter(&i2c->adapter);
 955                 if (ret) {
 956                         DRM_ERROR("Failed to register hw i2c %s\n", name);
 957                         goto out_free;
 958                 }
 959         } else {
 960                 /* set the radeon bit adapter */
 961                 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 962                          "Radeon i2c bit bus %s", name);
 963                 i2c->adapter.algo_data = &i2c->bit;
 964                 i2c->bit.pre_xfer = pre_xfer;
 965                 i2c->bit.post_xfer = post_xfer;
 966                 i2c->bit.setsda = set_data;
 967                 i2c->bit.setscl = set_clock;
 968                 i2c->bit.getsda = get_data;
 969                 i2c->bit.getscl = get_clock;
 970                 i2c->bit.udelay = 10;
 971                 i2c->bit.timeout = usecs_to_jiffies(2200);      /* from VESA */
 972                 i2c->bit.data = i2c;
 973                 ret = i2c_bit_add_bus(&i2c->adapter);
 974                 if (ret) {
 975                         DRM_ERROR("Failed to register bit i2c %s\n", name);
 976                         goto out_free;
 977                 }
 978         }
 979
 980         return i2c;
 981 out_free:
 982         kfree(i2c);
 983         return NULL;
 984
 985 }
 986
 987 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 988 {
 989         if (!i2c)
 990                 return;
 991         i2c_del_adapter(&i2c->adapter);
 992         if (i2c->has_aux)
 993                 drm_dp_aux_unregister(&i2c->aux);
 994         kfree(i2c);
 995 }
 996
 997 /* Add the default buses */
 998 void radeon_i2c_init(struct radeon_device *rdev)
 999 {
1000         if (radeon_hw_i2c)
1001                 DRM_INFO("hw_i2c forced on, you may experience display detection problems!\n");
1002
1003         if (rdev->is_atom_bios)
1004                 radeon_atombios_i2c_init(rdev);
1005         else
1006                 radeon_combios_i2c_init(rdev);
1007 }
1008
1009 /* remove all the buses */
1010 void radeon_i2c_fini(struct radeon_device *rdev)
1011 {
1012         int i;
1013
1014         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1015                 if (rdev->i2c_bus[i]) {
1016                         radeon_i2c_destroy(rdev->i2c_bus[i]);
1017                         rdev->i2c_bus[i] = NULL;
1018                 }
1019         }
1020 }
1021
1022 /* Add additional buses */
1023 void radeon_i2c_add(struct radeon_device *rdev,
1024                     struct radeon_i2c_bus_rec *rec,
1025                     const char *name)
1026 {
1027         struct drm_device *dev = rdev->ddev;
1028         int i;
1029
1030         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1031                 if (!rdev->i2c_bus[i]) {
1032                         rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
1033                         return;
1034                 }
1035         }
1036 }
1037
1038 /* looks up bus based on id */
1039 struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
1040                                           struct radeon_i2c_bus_rec *i2c_bus)
1041 {
1042         int i;
1043
1044         for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1045                 if (rdev->i2c_bus[i] &&
1046                     (rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
1047                         return rdev->i2c_bus[i];
1048                 }
1049         }
1050         return NULL;
1051 }
1052
1053 void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
1054                          u8 slave_addr,
1055                          u8 addr,
1056                          u8 *val)
1057 {
1058         u8 out_buf[2];
1059         u8 in_buf[2];
1060         struct i2c_msg msgs[] = {
1061                 {
1062                         .addr = slave_addr,
1063                         .flags = 0,
1064                         .len = 1,
1065                         .buf = out_buf,
1066                 },
1067                 {
1068                         .addr = slave_addr,
1069                         .flags = I2C_M_RD,
1070                         .len = 1,
1071                         .buf = in_buf,
1072                 }
1073         };
1074
1075         out_buf[0] = addr;
1076         out_buf[1] = 0;
1077
1078         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
1079                 *val = in_buf[0];
1080                 DRM_DEBUG("val = 0x%02x\n", *val);
1081         } else {
1082                 DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
1083                           addr, *val);
1084         }
1085 }
1086
1087 void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
1088                          u8 slave_addr,
1089                          u8 addr,
1090                          u8 val)
1091 {
1092         uint8_t out_buf[2];
1093         struct i2c_msg msg = {
1094                 .addr = slave_addr,
1095                 .flags = 0,
1096                 .len = 2,
1097                 .buf = out_buf,
1098         };
1099
1100         out_buf[0] = addr;
1101         out_buf[1] = val;
1102
1103         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
1104                 DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
1105                           addr, val);
1106 }
1107
1108 /* ddc router switching */
1109 void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
1110 {
1111         u8 val;
1112
1113         if (!radeon_connector->router.ddc_valid)
1114                 return;
1115
1116         if (!radeon_connector->router_bus)
1117                 return;
1118
1119         radeon_i2c_get_byte(radeon_connector->router_bus,
1120                             radeon_connector->router.i2c_addr,
1121                             0x3, &val);
1122         val &= ~radeon_connector->router.ddc_mux_control_pin;
1123         radeon_i2c_put_byte(radeon_connector->router_bus,
1124                             radeon_connector->router.i2c_addr,
1125                             0x3, val);
1126         radeon_i2c_get_byte(radeon_connector->router_bus,
1127                             radeon_connector->router.i2c_addr,
1128                             0x1, &val);
1129         val &= ~radeon_connector->router.ddc_mux_control_pin;
1130         val |= radeon_connector->router.ddc_mux_state;
1131         radeon_i2c_put_byte(radeon_connector->router_bus,
1132                             radeon_connector->router.i2c_addr,
1133                             0x1, val);
1134 }
1135
1136 /* clock/data router switching */
1137 void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
1138 {
1139         u8 val;
1140
1141         if (!radeon_connector->router.cd_valid)
1142                 return;
1143
1144         if (!radeon_connector->router_bus)
1145                 return;
1146
1147         radeon_i2c_get_byte(radeon_connector->router_bus,
1148                             radeon_connector->router.i2c_addr,
1149                             0x3, &val);
1150         val &= ~radeon_connector->router.cd_mux_control_pin;
1151         radeon_i2c_put_byte(radeon_connector->router_bus,
1152                             radeon_connector->router.i2c_addr,
1153                             0x3, val);
1154         radeon_i2c_get_byte(radeon_connector->router_bus,
1155                             radeon_connector->router.i2c_addr,
1156                             0x1, &val);
1157         val &= ~radeon_connector->router.cd_mux_control_pin;
1158         val |= radeon_connector->router.cd_mux_state;
1159         radeon_i2c_put_byte(radeon_connector->router_bus,
1160                             radeon_connector->router.i2c_addr,
1161                             0x1, val);
1162 }
1163