drivers/video/via/dvi.c

   1 /*
   2  * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
   3  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
   4
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public
   7  * License as published by the Free Software Foundation;
   8  * either version 2, or (at your option) any later version.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
  12  * the implied warranty of MERCHANTABILITY or FITNESS FOR
  13  * A PARTICULAR PURPOSE.See the GNU General Public License
  14  * for more details.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc.,
  19  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21 #include "global.h"
  22
  23 static void tmds_register_write(int index, u8 data);
  24 static int tmds_register_read(int index);
  25 static int tmds_register_read_bytes(int index, u8 *buff, int buff_len);
  26 static int check_reduce_blanking_mode(int mode_index,
  27         int refresh_rate);
  28 static int dvi_get_panel_size_from_DDCv1(void);
  29 static int dvi_get_panel_size_from_DDCv2(void);
  30 static unsigned char dvi_get_panel_info(void);
  31 static int viafb_dvi_query_EDID(void);
  32
  33 static int check_tmds_chip(int device_id_subaddr, int device_id)
  34 {
  35         if (tmds_register_read(device_id_subaddr) == device_id)
  36                 return OK;
  37         else
  38                 return FAIL;
  39 }
  40
  41 void viafb_init_dvi_size(void)
  42 {
  43         DEBUG_MSG(KERN_INFO "viafb_init_dvi_size()\n");
  44         DEBUG_MSG(KERN_INFO
  45                 "viaparinfo->tmds_setting_info->get_dvi_size_method %d\n",
  46                   viaparinfo->tmds_setting_info->get_dvi_size_method);
  47
  48         switch (viaparinfo->tmds_setting_info->get_dvi_size_method) {
  49         case GET_DVI_SIZE_BY_SYSTEM_BIOS:
  50                 break;
  51         case GET_DVI_SZIE_BY_HW_STRAPPING:
  52                 break;
  53         case GET_DVI_SIZE_BY_VGA_BIOS:
  54         default:
  55                 dvi_get_panel_info();
  56                 break;
  57         }
  58         return;
  59 }
  60
  61 int viafb_tmds_trasmitter_identify(void)
  62 {
  63         unsigned char sr2a = 0, sr1e = 0, sr3e = 0;
  64
  65         /* Turn on ouputting pad */
  66         switch (viaparinfo->chip_info->gfx_chip_name) {
  67         case UNICHROME_K8M890:
  68             /*=* DFP Low Pad on *=*/
  69                 sr2a = viafb_read_reg(VIASR, SR2A);
  70                 viafb_write_reg_mask(SR2A, VIASR, 0x03, BIT0 + BIT1);
  71                 break;
  72
  73         case UNICHROME_P4M900:
  74         case UNICHROME_P4M890:
  75                 /* DFP Low Pad on */
  76                 sr2a = viafb_read_reg(VIASR, SR2A);
  77                 viafb_write_reg_mask(SR2A, VIASR, 0x03, BIT0 + BIT1);
  78                 /* DVP0 Pad on */
  79                 sr1e = viafb_read_reg(VIASR, SR1E);
  80                 viafb_write_reg_mask(SR1E, VIASR, 0xC0, BIT6 + BIT7);
  81                 break;
  82
  83         default:
  84             /* DVP0/DVP1 Pad on */
  85                 sr1e = viafb_read_reg(VIASR, SR1E);
  86                 viafb_write_reg_mask(SR1E, VIASR, 0xF0, BIT4 +
  87                         BIT5 + BIT6 + BIT7);
  88             /* SR3E[1]Multi-function selection:
  89             0 = Emulate I2C and DDC bus by GPIO2/3/4. */
  90                 sr3e = viafb_read_reg(VIASR, SR3E);
  91                 viafb_write_reg_mask(SR3E, VIASR, 0x0, BIT5);
  92                 break;
  93         }
  94
  95         /* Check for VT1632: */
  96         viaparinfo->chip_info->tmds_chip_info.tmds_chip_name = VT1632_TMDS;
  97         viaparinfo->chip_info->
  98                 tmds_chip_info.tmds_chip_slave_addr = VT1632_TMDS_I2C_ADDR;
  99         viaparinfo->chip_info->tmds_chip_info.i2c_port = I2CPORTINDEX;
 100         if (check_tmds_chip(VT1632_DEVICE_ID_REG, VT1632_DEVICE_ID) != FAIL) {
 101                 /*
 102                  * Currently only support 12bits,dual edge,add 24bits mode later
 103                  */
 104                 tmds_register_write(0x08, 0x3b);
 105
 106                 DEBUG_MSG(KERN_INFO "\n VT1632 TMDS ! \n");
 107                 DEBUG_MSG(KERN_INFO "\n %2d",
 108                           viaparinfo->chip_info->tmds_chip_info.tmds_chip_name);
 109                 DEBUG_MSG(KERN_INFO "\n %2d",
 110                           viaparinfo->chip_info->tmds_chip_info.i2c_port);
 111                 return OK;
 112         } else {
 113                 viaparinfo->chip_info->tmds_chip_info.i2c_port = GPIOPORTINDEX;
 114                 if (check_tmds_chip(VT1632_DEVICE_ID_REG, VT1632_DEVICE_ID)
 115                     != FAIL) {
 116                         tmds_register_write(0x08, 0x3b);
 117                         DEBUG_MSG(KERN_INFO "\n VT1632 TMDS ! \n");
 118                         DEBUG_MSG(KERN_INFO "\n %2d",
 119                                   viaparinfo->chip_info->
 120                                   tmds_chip_info.tmds_chip_name);
 121                         DEBUG_MSG(KERN_INFO "\n %2d",
 122                                   viaparinfo->chip_info->
 123                                   tmds_chip_info.i2c_port);
 124                         return OK;
 125                 }
 126         }
 127
 128         viaparinfo->chip_info->tmds_chip_info.tmds_chip_name = INTEGRATED_TMDS;
 129
 130         if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) &&
 131             ((viafb_display_hardware_layout == HW_LAYOUT_DVI_ONLY) ||
 132              (viafb_display_hardware_layout == HW_LAYOUT_LCD_DVI))) {
 133                 DEBUG_MSG(KERN_INFO "\n Integrated TMDS ! \n");
 134                 return OK;
 135         }
 136
 137         switch (viaparinfo->chip_info->gfx_chip_name) {
 138         case UNICHROME_K8M890:
 139                 viafb_write_reg(SR2A, VIASR, sr2a);
 140                 break;
 141
 142         case UNICHROME_P4M900:
 143         case UNICHROME_P4M890:
 144                 viafb_write_reg(SR2A, VIASR, sr2a);
 145                 viafb_write_reg(SR1E, VIASR, sr1e);
 146                 break;
 147
 148         default:
 149                 viafb_write_reg(SR1E, VIASR, sr1e);
 150                 viafb_write_reg(SR3E, VIASR, sr3e);
 151                 break;
 152         }
 153
 154         viaparinfo->chip_info->
 155                 tmds_chip_info.tmds_chip_name = NON_TMDS_TRANSMITTER;
 156         viaparinfo->chip_info->tmds_chip_info.
 157                 tmds_chip_slave_addr = VT1632_TMDS_I2C_ADDR;
 158         return FAIL;
 159 }
 160
 161 static void tmds_register_write(int index, u8 data)
 162 {
 163         viaparinfo->shared->i2c_stuff.i2c_port =
 164                 viaparinfo->chip_info->tmds_chip_info.i2c_port;
 165
 166         viafb_i2c_writebyte(viaparinfo->chip_info->tmds_chip_info.
 167                 tmds_chip_slave_addr, index,
 168                      data);
 169 }
 170
 171 static int tmds_register_read(int index)
 172 {
 173         u8 data;
 174
 175         viaparinfo->shared->i2c_stuff.i2c_port =
 176                 viaparinfo->chip_info->tmds_chip_info.i2c_port;
 177         viafb_i2c_readbyte((u8) viaparinfo->chip_info->
 178             tmds_chip_info.tmds_chip_slave_addr,
 179                         (u8) index, &data);
 180         return data;
 181 }
 182
 183 static int tmds_register_read_bytes(int index, u8 *buff, int buff_len)
 184 {
 185         viaparinfo->shared->i2c_stuff.i2c_port =
 186                 viaparinfo->chip_info->tmds_chip_info.i2c_port;
 187         viafb_i2c_readbytes((u8) viaparinfo->chip_info->tmds_chip_info.
 188                          tmds_chip_slave_addr, (u8) index, buff, buff_len);
 189         return 0;
 190 }
 191
 192 static int check_reduce_blanking_mode(int mode_index,
 193         int refresh_rate)
 194 {
 195         if (refresh_rate != 60)
 196                 return false;
 197
 198         switch (mode_index) {
 199                 /* Following modes have reduce blanking mode. */
 200         case VIA_RES_1360X768:
 201         case VIA_RES_1400X1050:
 202         case VIA_RES_1440X900:
 203         case VIA_RES_1600X900:
 204         case VIA_RES_1680X1050:
 205         case VIA_RES_1920X1080:
 206         case VIA_RES_1920X1200:
 207                 break;
 208
 209         default:
 210                 DEBUG_MSG(KERN_INFO
 211                           "This dvi mode %d have no reduce blanking mode!\n",
 212                           mode_index);
 213                 return false;
 214         }
 215
 216         return true;
 217 }
 218
 219 /* DVI Set Mode */
 220 void viafb_dvi_set_mode(int video_index, int mode_bpp, int set_iga)
 221 {
 222         struct VideoModeTable *videoMode = NULL;
 223         struct crt_mode_table *pDviTiming;
 224         unsigned long desirePixelClock, maxPixelClock;
 225         int status = 0;
 226         videoMode = viafb_get_modetbl_pointer(video_index);
 227         pDviTiming = videoMode->crtc;
 228         desirePixelClock = pDviTiming->clk / 1000000;
 229         maxPixelClock = (unsigned long)viaparinfo->
 230                 tmds_setting_info->max_pixel_clock;
 231
 232         DEBUG_MSG(KERN_INFO "\nDVI_set_mode!!\n");
 233
 234         if ((maxPixelClock != 0) && (desirePixelClock > maxPixelClock)) {
 235                 /*Check if reduce-blanking mode is exist */
 236                 status =
 237                     check_reduce_blanking_mode(video_index,
 238                                                pDviTiming->refresh_rate);
 239                 if (status) {
 240                         video_index += 100;     /*Use reduce-blanking mode */
 241                         videoMode = viafb_get_modetbl_pointer(video_index);
 242                         pDviTiming = videoMode->crtc;
 243                         DEBUG_MSG(KERN_INFO
 244                                   "DVI use reduce blanking mode %d!!\n",
 245                                   video_index);
 246                 }
 247         }
 248         viafb_fill_crtc_timing(pDviTiming, video_index, mode_bpp / 8, set_iga);
 249         viafb_set_output_path(DEVICE_DVI, set_iga,
 250                         viaparinfo->chip_info->tmds_chip_info.output_interface);
 251 }
 252
 253 /* Sense DVI Connector */
 254 int viafb_dvi_sense(void)
 255 {
 256         u8 RegSR1E = 0, RegSR3E = 0, RegCR6B = 0, RegCR91 = 0,
 257                 RegCR93 = 0, RegCR9B = 0, data;
 258         int ret = false;
 259
 260         DEBUG_MSG(KERN_INFO "viafb_dvi_sense!!\n");
 261
 262         if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
 263                 /* DI1 Pad on */
 264                 RegSR1E = viafb_read_reg(VIASR, SR1E);
 265                 viafb_write_reg(SR1E, VIASR, RegSR1E | 0x30);
 266
 267                 /* CR6B[0]VCK Input Selection: 1 = External clock. */
 268                 RegCR6B = viafb_read_reg(VIACR, CR6B);
 269                 viafb_write_reg(CR6B, VIACR, RegCR6B | 0x08);
 270
 271                 /* CR91[4] VDD On [3] Data On [2] VEE On [1] Back Light Off
 272                    [0] Software Control Power Sequence */
 273                 RegCR91 = viafb_read_reg(VIACR, CR91);
 274                 viafb_write_reg(CR91, VIACR, 0x1D);
 275
 276                 /* CR93[7] DI1 Data Source Selection: 1 = DSP2.
 277                    CR93[5] DI1 Clock Source: 1 = internal.
 278                    CR93[4] DI1 Clock Polarity.
 279                    CR93[3:1] DI1 Clock Adjust. CR93[0] DI1 enable */
 280                 RegCR93 = viafb_read_reg(VIACR, CR93);
 281                 viafb_write_reg(CR93, VIACR, 0x01);
 282         } else {
 283                 /* DVP0/DVP1 Pad on */
 284                 RegSR1E = viafb_read_reg(VIASR, SR1E);
 285                 viafb_write_reg(SR1E, VIASR, RegSR1E | 0xF0);
 286
 287                 /* SR3E[1]Multi-function selection:
 288                    0 = Emulate I2C and DDC bus by GPIO2/3/4. */
 289                 RegSR3E = viafb_read_reg(VIASR, SR3E);
 290                 viafb_write_reg(SR3E, VIASR, RegSR3E & (~0x20));
 291
 292                 /* CR91[4] VDD On [3] Data On [2] VEE On [1] Back Light Off
 293                    [0] Software Control Power Sequence */
 294                 RegCR91 = viafb_read_reg(VIACR, CR91);
 295                 viafb_write_reg(CR91, VIACR, 0x1D);
 296
 297                 /*CR9B[4] DVP1 Data Source Selection: 1 = From secondary
 298                 display.CR9B[2:0] DVP1 Clock Adjust */
 299                 RegCR9B = viafb_read_reg(VIACR, CR9B);
 300                 viafb_write_reg(CR9B, VIACR, 0x01);
 301         }
 302
 303         data = (u8) tmds_register_read(0x09);
 304         if (data & 0x04)
 305                 ret = true;
 306
 307         if (ret == false) {
 308                 if (viafb_dvi_query_EDID())
 309                         ret = true;
 310         }
 311
 312         /* Restore status */
 313         viafb_write_reg(SR1E, VIASR, RegSR1E);
 314         viafb_write_reg(CR91, VIACR, RegCR91);
 315         if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
 316                 viafb_write_reg(CR6B, VIACR, RegCR6B);
 317                 viafb_write_reg(CR93, VIACR, RegCR93);
 318         } else {
 319                 viafb_write_reg(SR3E, VIASR, RegSR3E);
 320                 viafb_write_reg(CR9B, VIACR, RegCR9B);
 321         }
 322
 323         return ret;
 324 }
 325
 326 /* Query Flat Panel's EDID Table Version Through DVI Connector */
 327 static int viafb_dvi_query_EDID(void)
 328 {
 329         u8 data0, data1;
 330         int restore;
 331
 332         DEBUG_MSG(KERN_INFO "viafb_dvi_query_EDID!!\n");
 333
 334         restore = viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr;
 335         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = 0xA0;
 336
 337         data0 = (u8) tmds_register_read(0x00);
 338         data1 = (u8) tmds_register_read(0x01);
 339         if ((data0 == 0) && (data1 == 0xFF)) {
 340                 viaparinfo->chip_info->
 341                         tmds_chip_info.tmds_chip_slave_addr = restore;
 342                 return EDID_VERSION_1;  /* Found EDID1 Table */
 343         }
 344
 345         data0 = (u8) tmds_register_read(0x00);
 346         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = restore;
 347         if (data0 == 0x20)
 348                 return EDID_VERSION_2;  /* Found EDID2 Table */
 349         else
 350                 return false;
 351 }
 352
 353 /*
 354  *
 355  * int dvi_get_panel_size_from_DDCv1(void)
 356  *
 357  *     - Get Panel Size Using EDID1 Table
 358  *
 359  * Return Type:    int
 360  *
 361  */
 362 static int dvi_get_panel_size_from_DDCv1(void)
 363 {
 364         int i, max_h = 0, max_v = 0, tmp, restore;
 365         unsigned char rData;
 366         unsigned char EDID_DATA[18];
 367
 368         DEBUG_MSG(KERN_INFO "\n dvi_get_panel_size_from_DDCv1 \n");
 369
 370         restore = viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr;
 371         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = 0xA0;
 372
 373         rData = tmds_register_read(0x23);
 374         if (rData & 0x3C)
 375                 max_h = 640;
 376         if (rData & 0xC0)
 377                 max_h = 720;
 378         if (rData & 0x03)
 379                 max_h = 800;
 380
 381         rData = tmds_register_read(0x24);
 382         if (rData & 0xC0)
 383                 max_h = 800;
 384         if (rData & 0x1E)
 385                 max_h = 1024;
 386         if (rData & 0x01)
 387                 max_h = 1280;
 388
 389         for (i = 0x25; i < 0x6D; i++) {
 390                 switch (i) {
 391                 case 0x26:
 392                 case 0x28:
 393                 case 0x2A:
 394                 case 0x2C:
 395                 case 0x2E:
 396                 case 0x30:
 397                 case 0x32:
 398                 case 0x34:
 399                         rData = tmds_register_read(i);
 400                         if (rData == 1)
 401                                 break;
 402                         /* data = (data + 31) * 8 */
 403                         tmp = (rData + 31) << 3;
 404                         if (tmp > max_h)
 405                                 max_h = tmp;
 406                         break;
 407
 408                 case 0x36:
 409                 case 0x48:
 410                 case 0x5A:
 411                 case 0x6C:
 412                         tmds_register_read_bytes(i, EDID_DATA, 10);
 413                         if (!(EDID_DATA[0] || EDID_DATA[1])) {
 414                                 /* The first two byte must be zero. */
 415                                 if (EDID_DATA[3] == 0xFD) {
 416                                         /* To get max pixel clock. */
 417                                         viaparinfo->tmds_setting_info->
 418                                         max_pixel_clock = EDID_DATA[9] * 10;
 419                                 }
 420                         }
 421                         break;
 422
 423                 default:
 424                         break;
 425                 }
 426         }
 427
 428         switch (max_h) {
 429         case 640:
 430                 viaparinfo->tmds_setting_info->dvi_panel_size =
 431                         VIA_RES_640X480;
 432                 break;
 433         case 800:
 434                 viaparinfo->tmds_setting_info->dvi_panel_size =
 435                         VIA_RES_800X600;
 436                 break;
 437         case 1024:
 438                 viaparinfo->tmds_setting_info->dvi_panel_size =
 439                         VIA_RES_1024X768;
 440                 break;
 441         case 1280:
 442                 viaparinfo->tmds_setting_info->dvi_panel_size =
 443                         VIA_RES_1280X1024;
 444                 break;
 445         case 1400:
 446                 viaparinfo->tmds_setting_info->dvi_panel_size =
 447                         VIA_RES_1400X1050;
 448                 break;
 449         case 1440:
 450                 viaparinfo->tmds_setting_info->dvi_panel_size =
 451                         VIA_RES_1440X1050;
 452                 break;
 453         case 1600:
 454                 viaparinfo->tmds_setting_info->dvi_panel_size =
 455                         VIA_RES_1600X1200;
 456                 break;
 457         case 1920:
 458                 if (max_v == 1200) {
 459                         viaparinfo->tmds_setting_info->dvi_panel_size =
 460                                 VIA_RES_1920X1200;
 461                 } else {
 462                         viaparinfo->tmds_setting_info->dvi_panel_size =
 463                                 VIA_RES_1920X1080;
 464                 }
 465
 466                 break;
 467         default:
 468                 viaparinfo->tmds_setting_info->dvi_panel_size =
 469                         VIA_RES_1024X768;
 470                 DEBUG_MSG(KERN_INFO "Unknow panel size max resolution = %d !\
 471                                          set default panel size.\n", max_h);
 472                 break;
 473         }
 474
 475         DEBUG_MSG(KERN_INFO "DVI max pixelclock = %d\n",
 476                   viaparinfo->tmds_setting_info->max_pixel_clock);
 477         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = restore;
 478         return viaparinfo->tmds_setting_info->dvi_panel_size;
 479 }
 480
 481 /*
 482  *
 483  * int dvi_get_panel_size_from_DDCv2(void)
 484  *
 485  *     - Get Panel Size Using EDID2 Table
 486  *
 487  * Return Type:    int
 488  *
 489  */
 490 static int dvi_get_panel_size_from_DDCv2(void)
 491 {
 492         int HSize = 0, restore;
 493         unsigned char R_Buffer[2];
 494
 495         DEBUG_MSG(KERN_INFO "\n dvi_get_panel_size_from_DDCv2 \n");
 496
 497         restore = viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr;
 498         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = 0xA2;
 499
 500         /* Horizontal: 0x76, 0x77 */
 501         tmds_register_read_bytes(0x76, R_Buffer, 2);
 502         HSize = R_Buffer[0];
 503         HSize += R_Buffer[1] << 8;
 504
 505         switch (HSize) {
 506         case 640:
 507                 viaparinfo->tmds_setting_info->dvi_panel_size =
 508                         VIA_RES_640X480;
 509                 break;
 510         case 800:
 511                 viaparinfo->tmds_setting_info->dvi_panel_size =
 512                         VIA_RES_800X600;
 513                 break;
 514         case 1024:
 515                 viaparinfo->tmds_setting_info->dvi_panel_size =
 516                         VIA_RES_1024X768;
 517                 break;
 518         case 1280:
 519                 viaparinfo->tmds_setting_info->dvi_panel_size =
 520                         VIA_RES_1280X1024;
 521                 break;
 522         case 1400:
 523                 viaparinfo->tmds_setting_info->dvi_panel_size =
 524                         VIA_RES_1400X1050;
 525                 break;
 526         case 1440:
 527                 viaparinfo->tmds_setting_info->dvi_panel_size =
 528                         VIA_RES_1440X1050;
 529                 break;
 530         case 1600:
 531                 viaparinfo->tmds_setting_info->dvi_panel_size =
 532                         VIA_RES_1600X1200;
 533                 break;
 534         default:
 535                 viaparinfo->tmds_setting_info->dvi_panel_size =
 536                         VIA_RES_1024X768;
 537                 DEBUG_MSG(KERN_INFO "Unknow panel size max resolution = %d!\
 538                                         set default panel size.\n", HSize);
 539                 break;
 540         }
 541
 542         viaparinfo->chip_info->tmds_chip_info.tmds_chip_slave_addr = restore;
 543         return viaparinfo->tmds_setting_info->dvi_panel_size;
 544 }
 545
 546 /*
 547  *
 548  * unsigned char dvi_get_panel_info(void)
 549  *
 550  *     - Get Panel Size
 551  *
 552  * Return Type:    unsigned char
 553  */
 554 static unsigned char dvi_get_panel_info(void)
 555 {
 556         unsigned char dvipanelsize;
 557         DEBUG_MSG(KERN_INFO "dvi_get_panel_info! \n");
 558
 559         viafb_dvi_sense();
 560         switch (viafb_dvi_query_EDID()) {
 561         case 1:
 562                 dvi_get_panel_size_from_DDCv1();
 563                 break;
 564         case 2:
 565                 dvi_get_panel_size_from_DDCv2();
 566                 break;
 567         default:
 568                 break;
 569         }
 570
 571         DEBUG_MSG(KERN_INFO "dvi panel size is %2d \n",
 572                   viaparinfo->tmds_setting_info->dvi_panel_size);
 573         dvipanelsize = (unsigned char)(viaparinfo->
 574                 tmds_setting_info->dvi_panel_size);
 575         return dvipanelsize;
 576 }
 577
 578 /* If Disable DVI, turn off pad */
 579 void viafb_dvi_disable(void)
 580 {
 581         if (viaparinfo->chip_info->
 582                 tmds_chip_info.output_interface == INTERFACE_DVP0)
 583                 viafb_write_reg(SR1E, VIASR,
 584                 viafb_read_reg(VIASR, SR1E) & (~0xC0));
 585
 586         if (viaparinfo->chip_info->
 587                 tmds_chip_info.output_interface == INTERFACE_DVP1)
 588                 viafb_write_reg(SR1E, VIASR,
 589                 viafb_read_reg(VIASR, SR1E) & (~0x30));
 590
 591         if (viaparinfo->chip_info->
 592                 tmds_chip_info.output_interface == INTERFACE_DFP_HIGH)
 593                 viafb_write_reg(SR2A, VIASR,
 594                 viafb_read_reg(VIASR, SR2A) & (~0x0C));
 595
 596         if (viaparinfo->chip_info->
 597                 tmds_chip_info.output_interface == INTERFACE_DFP_LOW)
 598                 viafb_write_reg(SR2A, VIASR,
 599                 viafb_read_reg(VIASR, SR2A) & (~0x03));
 600
 601         if (viaparinfo->chip_info->
 602                 tmds_chip_info.output_interface == INTERFACE_TMDS)
 603                 /* Turn off TMDS power. */
 604                 viafb_write_reg(CRD2, VIACR,
 605                 viafb_read_reg(VIACR, CRD2) | 0x08);
 606 }
 607
 608 /* If Enable DVI, turn off pad */
 609 void viafb_dvi_enable(void)
 610 {
 611         u8 data;
 612
 613         if (viaparinfo->chip_info->
 614                 tmds_chip_info.output_interface == INTERFACE_DVP0) {
 615                 viafb_write_reg(SR1E, VIASR,
 616                         viafb_read_reg(VIASR, SR1E) | 0xC0);
 617                 if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
 618                         tmds_register_write(0x88, 0x3b);
 619                 else
 620                         /*clear CR91[5] to direct on display period
 621                            in the secondary diplay path */
 622                         viafb_write_reg(CR91, VIACR,
 623                         viafb_read_reg(VIACR, CR91) & 0xDF);
 624         }
 625
 626         if (viaparinfo->chip_info->
 627                 tmds_chip_info.output_interface == INTERFACE_DVP1) {
 628                 viafb_write_reg(SR1E, VIASR,
 629                         viafb_read_reg(VIASR, SR1E) | 0x30);
 630
 631                 /*fix dvi cann't be enabled with MB VT5718C4 - Al Zhang */
 632                 if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
 633                         tmds_register_write(0x88, 0x3b);
 634                 } else {
 635                         /*clear CR91[5] to direct on display period
 636                           in the secondary diplay path */
 637                         viafb_write_reg(CR91, VIACR,
 638                         viafb_read_reg(VIACR, CR91) & 0xDF);
 639                 }
 640
 641                 /*fix DVI cannot enable on EPIA-M board */
 642                 if (viafb_platform_epia_dvi == 1) {
 643                         viafb_write_reg_mask(CR91, VIACR, 0x1f, 0x1f);
 644                         viafb_write_reg_mask(CR88, VIACR, 0x00, BIT6 + BIT0);
 645                         if (viafb_bus_width == 24) {
 646                                 if (viafb_device_lcd_dualedge == 1)
 647                                         data = 0x3F;
 648                                 else
 649                                         data = 0x37;
 650                                 viafb_i2c_writebyte(viaparinfo->chip_info->
 651                                              tmds_chip_info.
 652                                              tmds_chip_slave_addr,
 653                                              0x08, data);
 654                         }
 655                 }
 656         }
 657
 658         if (viaparinfo->chip_info->
 659                 tmds_chip_info.output_interface == INTERFACE_DFP_HIGH) {
 660                 viafb_write_reg(SR2A, VIASR,
 661                         viafb_read_reg(VIASR, SR2A) | 0x0C);
 662                 viafb_write_reg(CR91, VIACR,
 663                         viafb_read_reg(VIACR, CR91) & 0xDF);
 664         }
 665
 666         if (viaparinfo->chip_info->
 667                 tmds_chip_info.output_interface == INTERFACE_DFP_LOW) {
 668                 viafb_write_reg(SR2A, VIASR,
 669                         viafb_read_reg(VIASR, SR2A) | 0x03);
 670                 viafb_write_reg(CR91, VIACR,
 671                         viafb_read_reg(VIACR, CR91) & 0xDF);
 672         }
 673         if (viaparinfo->chip_info->
 674                 tmds_chip_info.output_interface == INTERFACE_TMDS) {
 675                 /* Turn on Display period in the panel path. */
 676                 viafb_write_reg_mask(CR91, VIACR, 0, BIT7);
 677
 678                 /* Turn on TMDS power. */
 679                 viafb_write_reg_mask(CRD2, VIACR, 0, BIT3);
 680         }
 681 }
 682