root/drivers/gpu/drm/i915/display/dvo_ns2501.c

DEFINITIONS

1. ns2501_readb
2. ns2501_writeb
3. ns2501_init
4. ns2501_detect
5. ns2501_mode_valid
6. ns2501_mode_set
7. ns2501_get_hw_state
8. ns2501_dpms
9. ns2501_destroy

   1 /*
   2  *
   3  * Copyright (c) 2012 Gilles Dartiguelongue, Thomas Richter
   4  *
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28 
  29 #include "i915_drv.h"
  30 #include "i915_reg.h"
  31 #include "intel_display_types.h"
  32 #include "intel_dvo_dev.h"
  33 
  34 #define NS2501_VID 0x1305
  35 #define NS2501_DID 0x6726
  36 
  37 #define NS2501_VID_LO 0x00
  38 #define NS2501_VID_HI 0x01
  39 #define NS2501_DID_LO 0x02
  40 #define NS2501_DID_HI 0x03
  41 #define NS2501_REV 0x04
  42 #define NS2501_RSVD 0x05
  43 #define NS2501_FREQ_LO 0x06
  44 #define NS2501_FREQ_HI 0x07
  45 
  46 #define NS2501_REG8 0x08
  47 #define NS2501_8_VEN (1<<5)
  48 #define NS2501_8_HEN (1<<4)
  49 #define NS2501_8_DSEL (1<<3)
  50 #define NS2501_8_BPAS (1<<2)
  51 #define NS2501_8_RSVD (1<<1)
  52 #define NS2501_8_PD (1<<0)
  53 
  54 #define NS2501_REG9 0x09
  55 #define NS2501_9_VLOW (1<<7)
  56 #define NS2501_9_MSEL_MASK (0x7<<4)
  57 #define NS2501_9_TSEL (1<<3)
  58 #define NS2501_9_RSEN (1<<2)
  59 #define NS2501_9_RSVD (1<<1)
  60 #define NS2501_9_MDI (1<<0)
  61 
  62 #define NS2501_REGC 0x0c
  63 
  64 /*
  65  * The following registers are not part of the official datasheet
  66  * and are the result of reverse engineering.
  67  */
  68 
  69 /*
  70  * Register c0 controls how the DVO synchronizes with
  71  * its input.
  72  */
  73 #define NS2501_REGC0 0xc0
  74 #define NS2501_C0_ENABLE (1<<0) /* enable the DVO sync in general */
  75 #define NS2501_C0_HSYNC (1<<1)  /* synchronize horizontal with input */
  76 #define NS2501_C0_VSYNC (1<<2)  /* synchronize vertical with input */
  77 #define NS2501_C0_RESET (1<<7)  /* reset the synchronization flip/flops */
  78 
  79 /*
  80  * Register 41 is somehow related to the sync register and sync
  81  * configuration. It should be 0x32 whenever regC0 is 0x05 (hsync off)
  82  * and 0x00 otherwise.
  83  */
  84 #define NS2501_REG41 0x41
  85 
  86 /*
  87  * this register controls the dithering of the DVO
  88  * One bit enables it, the other define the dithering depth.
  89  * The higher the value, the lower the dithering depth.
  90  */
  91 #define NS2501_F9_REG 0xf9
  92 #define NS2501_F9_ENABLE (1<<0)         /* if set, dithering is enabled */
  93 #define NS2501_F9_DITHER_MASK (0x7f<<1) /* controls the dither depth */
  94 #define NS2501_F9_DITHER_SHIFT 1        /* shifts the dither mask */
  95 
  96 /*
  97  * PLL configuration register. This is a pair of registers,
  98  * one single byte register at 1B, and a pair at 1C,1D.
  99  * These registers are counters/dividers.
 100  */
 101 #define NS2501_REG1B 0x1b /* one byte PLL control register */
 102 #define NS2501_REG1C 0x1c /* low-part of the second register */
 103 #define NS2501_REG1D 0x1d /* high-part of the second register */
 104 
 105 /*
 106  * Scaler control registers. Horizontal at b8,b9,
 107  * vertical at 10,11. The scale factor is computed as
 108  * 2^16/control-value. The low-byte comes first.
 109  */
 110 #define NS2501_REG10 0x10 /* low-byte vertical scaler */
 111 #define NS2501_REG11 0x11 /* high-byte vertical scaler */
 112 #define NS2501_REGB8 0xb8 /* low-byte horizontal scaler */
 113 #define NS2501_REGB9 0xb9 /* high-byte horizontal scaler */
 114 
 115 /*
 116  * Display window definition. This consists of four registers
 117  * per dimension. One register pair defines the start of the
 118  * display, one the end.
 119  * As far as I understand, this defines the window within which
 120  * the scaler samples the input.
 121  */
 122 #define NS2501_REGC1 0xc1 /* low-byte horizontal display start */
 123 #define NS2501_REGC2 0xc2 /* high-byte horizontal display start */
 124 #define NS2501_REGC3 0xc3 /* low-byte horizontal display stop */
 125 #define NS2501_REGC4 0xc4 /* high-byte horizontal display stop */
 126 #define NS2501_REGC5 0xc5 /* low-byte vertical display start */
 127 #define NS2501_REGC6 0xc6 /* high-byte vertical display start */
 128 #define NS2501_REGC7 0xc7 /* low-byte vertical display stop */
 129 #define NS2501_REGC8 0xc8 /* high-byte vertical display stop */
 130 
 131 /*
 132  * The following register pair seems to define the start of
 133  * the vertical sync. If automatic syncing is enabled, and the
 134  * register value defines a sync pulse that is later than the
 135  * incoming sync, then the register value is ignored and the
 136  * external hsync triggers the synchronization.
 137  */
 138 #define NS2501_REG80 0x80 /* low-byte vsync-start */
 139 #define NS2501_REG81 0x81 /* high-byte vsync-start */
 140 
 141 /*
 142  * The following register pair seems to define the total number
 143  * of lines created at the output side of the scaler.
 144  * This is again a low-high register pair.
 145  */
 146 #define NS2501_REG82 0x82 /* output display height, low byte */
 147 #define NS2501_REG83 0x83 /* output display height, high byte */
 148 
 149 /*
 150  * The following registers define the end of the front-porch
 151  * in horizontal and vertical position and hence allow to shift
 152  * the image left/right or up/down.
 153  */
 154 #define NS2501_REG98 0x98 /* horizontal start of display + 256, low */
 155 #define NS2501_REG99 0x99 /* horizontal start of display + 256, high */
 156 #define NS2501_REG8E 0x8e /* vertical start of the display, low byte */
 157 #define NS2501_REG8F 0x8f /* vertical start of the display, high byte */
 158 
 159 /*
 160  * The following register pair control the function of the
 161  * backlight and the DVO output. To enable the corresponding
 162  * function, the corresponding bit must be set in both registers.
 163  */
 164 #define NS2501_REG34 0x34 /* DVO enable functions, first register */
 165 #define NS2501_REG35 0x35 /* DVO enable functions, second register */
 166 #define NS2501_34_ENABLE_OUTPUT (1<<0) /* enable DVO output */
 167 #define NS2501_34_ENABLE_BACKLIGHT (1<<1) /* enable backlight */
 168 
 169 /*
 170  * Registers 9C and 9D define the vertical output offset
 171  * of the visible region.
 172  */
 173 #define NS2501_REG9C 0x9c
 174 #define NS2501_REG9D 0x9d
 175 
 176 /*
 177  * The register 9F defines the dithering. This requires the
 178  * scaler to be ON. Bit 0 enables dithering, the remaining
 179  * bits control the depth of the dither. The higher the value,
 180  * the LOWER the dithering amplitude. A good value seems to be
 181  * 15 (total register value).
 182  */
 183 #define NS2501_REGF9 0xf9
 184 #define NS2501_F9_ENABLE_DITHER (1<<0) /* enable dithering */
 185 #define NS2501_F9_DITHER_MASK (0x7f<<1) /* dither masking */
 186 #define NS2501_F9_DITHER_SHIFT 1        /* upshift of the dither mask */
 187 
 188 enum {
 189         MODE_640x480,
 190         MODE_800x600,
 191         MODE_1024x768,
 192 };
 193 
 194 struct ns2501_reg {
 195         u8 offset;
 196         u8 value;
 197 };
 198 
 199 /*
 200  * The following structure keeps the complete configuration of
 201  * the DVO, given a specific output configuration.
 202  * This is pretty much guess-work from reverse-engineering, so
 203  * read all this with a grain of salt.
 204  */
 205 struct ns2501_configuration {
 206         u8 sync;                /* configuration of the C0 register */
 207         u8 conf;                /* configuration register 8 */
 208         u8 syncb;               /* configuration register 41 */
 209         u8 dither;              /* configuration of the dithering */
 210         u8 pll_a;               /* PLL configuration, register A, 1B */
 211         u16 pll_b;              /* PLL configuration, register B, 1C/1D */
 212         u16 hstart;             /* horizontal start, registers C1/C2 */
 213         u16 hstop;              /* horizontal total, registers C3/C4 */
 214         u16 vstart;             /* vertical start, registers C5/C6 */
 215         u16 vstop;              /* vertical total, registers C7/C8 */
 216         u16 vsync;              /* manual vertical sync start, 80/81 */
 217         u16 vtotal;             /* number of lines generated, 82/83 */
 218         u16 hpos;               /* horizontal position + 256, 98/99  */
 219         u16 vpos;               /* vertical position, 8e/8f */
 220         u16 voffs;              /* vertical output offset, 9c/9d */
 221         u16 hscale;             /* horizontal scaling factor, b8/b9 */
 222         u16 vscale;             /* vertical scaling factor, 10/11 */
 223 };
 224 
 225 /*
 226  * DVO configuration values, partially based on what the BIOS
 227  * of the Fujitsu Lifebook S6010 writes into registers,
 228  * partially found by manual tweaking. These configurations assume
 229  * a 1024x768 panel.
 230  */
 231 static const struct ns2501_configuration ns2501_modes[] = {
 232         [MODE_640x480] = {
 233                 .sync   = NS2501_C0_ENABLE | NS2501_C0_VSYNC,
 234                 .conf   = NS2501_8_VEN | NS2501_8_HEN | NS2501_8_PD,
 235                 .syncb  = 0x32,
 236                 .dither = 0x0f,
 237                 .pll_a  = 17,
 238                 .pll_b  = 852,
 239                 .hstart = 144,
 240                 .hstop  = 783,
 241                 .vstart = 22,
 242                 .vstop  = 514,
 243                 .vsync  = 2047, /* actually, ignored with this config */
 244                 .vtotal = 1341,
 245                 .hpos   = 0,
 246                 .vpos   = 16,
 247                 .voffs  = 36,
 248                 .hscale = 40960,
 249                 .vscale = 40960
 250         },
 251         [MODE_800x600] = {
 252                 .sync   = NS2501_C0_ENABLE |
 253                           NS2501_C0_HSYNC | NS2501_C0_VSYNC,
 254                 .conf   = NS2501_8_VEN | NS2501_8_HEN | NS2501_8_PD,
 255                 .syncb  = 0x00,
 256                 .dither = 0x0f,
 257                 .pll_a  = 25,
 258                 .pll_b  = 612,
 259                 .hstart = 215,
 260                 .hstop  = 1016,
 261                 .vstart = 26,
 262                 .vstop  = 627,
 263                 .vsync  = 807,
 264                 .vtotal = 1341,
 265                 .hpos   = 0,
 266                 .vpos   = 4,
 267                 .voffs  = 35,
 268                 .hscale = 51248,
 269                 .vscale = 51232
 270         },
 271         [MODE_1024x768] = {
 272                 .sync   = NS2501_C0_ENABLE | NS2501_C0_VSYNC,
 273                 .conf   = NS2501_8_VEN | NS2501_8_HEN | NS2501_8_PD,
 274                 .syncb  = 0x32,
 275                 .dither = 0x0f,
 276                 .pll_a  = 11,
 277                 .pll_b  = 1350,
 278                 .hstart = 276,
 279                 .hstop  = 1299,
 280                 .vstart = 15,
 281                 .vstop  = 1056,
 282                 .vsync  = 2047,
 283                 .vtotal = 1341,
 284                 .hpos   = 0,
 285                 .vpos   = 7,
 286                 .voffs  = 27,
 287                 .hscale = 65535,
 288                 .vscale = 65535
 289         }
 290 };
 291 
 292 /*
 293  * Other configuration values left by the BIOS of the
 294  * Fujitsu S6010 in the DVO control registers. Their
 295  * value does not depend on the BIOS and their meaning
 296  * is unknown.
 297  */
 298 
 299 static const struct ns2501_reg mode_agnostic_values[] = {
 300         /* 08 is mode specific */
 301         [0] = { .offset = 0x0a, .value = 0x81, },
 302         /* 10,11 are part of the mode specific configuration */
 303         [1] = { .offset = 0x12, .value = 0x02, },
 304         [2] = { .offset = 0x18, .value = 0x07, },
 305         [3] = { .offset = 0x19, .value = 0x00, },
 306         [4] = { .offset = 0x1a, .value = 0x00, }, /* PLL?, ignored */
 307         /* 1b,1c,1d are part of the mode specific configuration */
 308         [5] = { .offset = 0x1e, .value = 0x02, },
 309         [6] = { .offset = 0x1f, .value = 0x40, },
 310         [7] = { .offset = 0x20, .value = 0x00, },
 311         [8] = { .offset = 0x21, .value = 0x00, },
 312         [9] = { .offset = 0x22, .value = 0x00, },
 313         [10] = { .offset = 0x23, .value = 0x00, },
 314         [11] = { .offset = 0x24, .value = 0x00, },
 315         [12] = { .offset = 0x25, .value = 0x00, },
 316         [13] = { .offset = 0x26, .value = 0x00, },
 317         [14] = { .offset = 0x27, .value = 0x00, },
 318         [15] = { .offset = 0x7e, .value = 0x18, },
 319         /* 80-84 are part of the mode-specific configuration */
 320         [16] = { .offset = 0x84, .value = 0x00, },
 321         [17] = { .offset = 0x85, .value = 0x00, },
 322         [18] = { .offset = 0x86, .value = 0x00, },
 323         [19] = { .offset = 0x87, .value = 0x00, },
 324         [20] = { .offset = 0x88, .value = 0x00, },
 325         [21] = { .offset = 0x89, .value = 0x00, },
 326         [22] = { .offset = 0x8a, .value = 0x00, },
 327         [23] = { .offset = 0x8b, .value = 0x00, },
 328         [24] = { .offset = 0x8c, .value = 0x10, },
 329         [25] = { .offset = 0x8d, .value = 0x02, },
 330         /* 8e,8f are part of the mode-specific configuration */
 331         [26] = { .offset = 0x90, .value = 0xff, },
 332         [27] = { .offset = 0x91, .value = 0x07, },
 333         [28] = { .offset = 0x92, .value = 0xa0, },
 334         [29] = { .offset = 0x93, .value = 0x02, },
 335         [30] = { .offset = 0x94, .value = 0x00, },
 336         [31] = { .offset = 0x95, .value = 0x00, },
 337         [32] = { .offset = 0x96, .value = 0x05, },
 338         [33] = { .offset = 0x97, .value = 0x00, },
 339         /* 98,99 are part of the mode-specific configuration */
 340         [34] = { .offset = 0x9a, .value = 0x88, },
 341         [35] = { .offset = 0x9b, .value = 0x00, },
 342         /* 9c,9d are part of the mode-specific configuration */
 343         [36] = { .offset = 0x9e, .value = 0x25, },
 344         [37] = { .offset = 0x9f, .value = 0x03, },
 345         [38] = { .offset = 0xa0, .value = 0x28, },
 346         [39] = { .offset = 0xa1, .value = 0x01, },
 347         [40] = { .offset = 0xa2, .value = 0x28, },
 348         [41] = { .offset = 0xa3, .value = 0x05, },
 349         /* register 0xa4 is mode specific, but 0x80..0x84 works always */
 350         [42] = { .offset = 0xa4, .value = 0x84, },
 351         [43] = { .offset = 0xa5, .value = 0x00, },
 352         [44] = { .offset = 0xa6, .value = 0x00, },
 353         [45] = { .offset = 0xa7, .value = 0x00, },
 354         [46] = { .offset = 0xa8, .value = 0x00, },
 355         /* 0xa9 to 0xab are mode specific, but have no visible effect */
 356         [47] = { .offset = 0xa9, .value = 0x04, },
 357         [48] = { .offset = 0xaa, .value = 0x70, },
 358         [49] = { .offset = 0xab, .value = 0x4f, },
 359         [50] = { .offset = 0xac, .value = 0x00, },
 360         [51] = { .offset = 0xad, .value = 0x00, },
 361         [52] = { .offset = 0xb6, .value = 0x09, },
 362         [53] = { .offset = 0xb7, .value = 0x03, },
 363         /* b8,b9 are part of the mode-specific configuration */
 364         [54] = { .offset = 0xba, .value = 0x00, },
 365         [55] = { .offset = 0xbb, .value = 0x20, },
 366         [56] = { .offset = 0xf3, .value = 0x90, },
 367         [57] = { .offset = 0xf4, .value = 0x00, },
 368         [58] = { .offset = 0xf7, .value = 0x88, },
 369         /* f8 is mode specific, but the value does not matter */
 370         [59] = { .offset = 0xf8, .value = 0x0a, },
 371         [60] = { .offset = 0xf9, .value = 0x00, }
 372 };
 373 
 374 static const struct ns2501_reg regs_init[] = {
 375         [0] = { .offset = 0x35, .value = 0xff, },
 376         [1] = { .offset = 0x34, .value = 0x00, },
 377         [2] = { .offset = 0x08, .value = 0x30, },
 378 };
 379 
 380 struct ns2501_priv {
 381         bool quiet;
 382         const struct ns2501_configuration *conf;
 383 };
 384 
 385 #define NSPTR(d) ((NS2501Ptr)(d->DriverPrivate.ptr))
 386 
 387 /*
 388 ** Read a register from the ns2501.
 389 ** Returns true if successful, false otherwise.
 390 ** If it returns false, it might be wise to enable the
 391 ** DVO with the above function.
 392 */
 393 static bool ns2501_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
 394 {
 395         struct ns2501_priv *ns = dvo->dev_priv;
 396         struct i2c_adapter *adapter = dvo->i2c_bus;
 397         u8 out_buf[2];
 398         u8 in_buf[2];
 399 
 400         struct i2c_msg msgs[] = {
 401                 {
 402                  .addr = dvo->slave_addr,
 403                  .flags = 0,
 404                  .len = 1,
 405                  .buf = out_buf,
 406                  },
 407                 {
 408                  .addr = dvo->slave_addr,
 409                  .flags = I2C_M_RD,
 410                  .len = 1,
 411                  .buf = in_buf,
 412                  }
 413         };
 414 
 415         out_buf[0] = addr;
 416         out_buf[1] = 0;
 417 
 418         if (i2c_transfer(adapter, msgs, 2) == 2) {
 419                 *ch = in_buf[0];
 420                 return true;
 421         }
 422 
 423         if (!ns->quiet) {
 424                 DRM_DEBUG_KMS
 425                     ("Unable to read register 0x%02x from %s:0x%02x.\n", addr,
 426                      adapter->name, dvo->slave_addr);
 427         }
 428 
 429         return false;
 430 }
 431 
 432 /*
 433 ** Write a register to the ns2501.
 434 ** Returns true if successful, false otherwise.
 435 ** If it returns false, it might be wise to enable the
 436 ** DVO with the above function.
 437 */
 438 static bool ns2501_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
 439 {
 440         struct ns2501_priv *ns = dvo->dev_priv;
 441         struct i2c_adapter *adapter = dvo->i2c_bus;
 442         u8 out_buf[2];
 443 
 444         struct i2c_msg msg = {
 445                 .addr = dvo->slave_addr,
 446                 .flags = 0,
 447                 .len = 2,
 448                 .buf = out_buf,
 449         };
 450 
 451         out_buf[0] = addr;
 452         out_buf[1] = ch;
 453 
 454         if (i2c_transfer(adapter, &msg, 1) == 1) {
 455                 return true;
 456         }
 457 
 458         if (!ns->quiet) {
 459                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d\n",
 460                               addr, adapter->name, dvo->slave_addr);
 461         }
 462 
 463         return false;
 464 }
 465 
 466 /* National Semiconductor 2501 driver for chip on i2c bus
 467  * scan for the chip on the bus.
 468  * Hope the VBIOS initialized the PLL correctly so we can
 469  * talk to it. If not, it will not be seen and not detected.
 470  * Bummer!
 471  */
 472 static bool ns2501_init(struct intel_dvo_device *dvo,
 473                         struct i2c_adapter *adapter)
 474 {
 475         /* this will detect the NS2501 chip on the specified i2c bus */
 476         struct ns2501_priv *ns;
 477         unsigned char ch;
 478 
 479         ns = kzalloc(sizeof(struct ns2501_priv), GFP_KERNEL);
 480         if (ns == NULL)
 481                 return false;
 482 
 483         dvo->i2c_bus = adapter;
 484         dvo->dev_priv = ns;
 485         ns->quiet = true;
 486 
 487         if (!ns2501_readb(dvo, NS2501_VID_LO, &ch))
 488                 goto out;
 489 
 490         if (ch != (NS2501_VID & 0xff)) {
 491                 DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",
 492                               ch, adapter->name, dvo->slave_addr);
 493                 goto out;
 494         }
 495 
 496         if (!ns2501_readb(dvo, NS2501_DID_LO, &ch))
 497                 goto out;
 498 
 499         if (ch != (NS2501_DID & 0xff)) {
 500                 DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",
 501                               ch, adapter->name, dvo->slave_addr);
 502                 goto out;
 503         }
 504         ns->quiet = false;
 505 
 506         DRM_DEBUG_KMS("init ns2501 dvo controller successfully!\n");
 507 
 508         return true;
 509 
 510 out:
 511         kfree(ns);
 512         return false;
 513 }
 514 
 515 static enum drm_connector_status ns2501_detect(struct intel_dvo_device *dvo)
 516 {
 517         /*
 518          * This is a Laptop display, it doesn't have hotplugging.
 519          * Even if not, the detection bit of the 2501 is unreliable as
 520          * it only works for some display types.
 521          * It is even more unreliable as the PLL must be active for
 522          * allowing reading from the chiop.
 523          */
 524         return connector_status_connected;
 525 }
 526 
 527 static enum drm_mode_status ns2501_mode_valid(struct intel_dvo_device *dvo,
 528                                               struct drm_display_mode *mode)
 529 {
 530         DRM_DEBUG_KMS
 531             ("is mode valid (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d)\n",
 532              mode->hdisplay, mode->htotal, mode->vdisplay, mode->vtotal);
 533 
 534         /*
 535          * Currently, these are all the modes I have data from.
 536          * More might exist. Unclear how to find the native resolution
 537          * of the panel in here so we could always accept it
 538          * by disabling the scaler.
 539          */
 540         if ((mode->hdisplay == 640 && mode->vdisplay == 480 && mode->clock == 25175) ||
 541             (mode->hdisplay == 800 && mode->vdisplay == 600 && mode->clock == 40000) ||
 542             (mode->hdisplay == 1024 && mode->vdisplay == 768 && mode->clock == 65000)) {
 543                 return MODE_OK;
 544         } else {
 545                 return MODE_ONE_SIZE;   /* Is this a reasonable error? */
 546         }
 547 }
 548 
 549 static void ns2501_mode_set(struct intel_dvo_device *dvo,
 550                             const struct drm_display_mode *mode,
 551                             const struct drm_display_mode *adjusted_mode)
 552 {
 553         const struct ns2501_configuration *conf;
 554         struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
 555         int mode_idx, i;
 556 
 557         DRM_DEBUG_KMS
 558             ("set mode (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d).\n",
 559              mode->hdisplay, mode->htotal, mode->vdisplay, mode->vtotal);
 560 
 561         DRM_DEBUG_KMS("Detailed requested mode settings are:\n"
 562                         "clock          : %d kHz\n"
 563                         "hdisplay       : %d\n"
 564                         "hblank start   : %d\n"
 565                         "hblank end     : %d\n"
 566                         "hsync start    : %d\n"
 567                         "hsync end      : %d\n"
 568                         "htotal         : %d\n"
 569                         "hskew          : %d\n"
 570                         "vdisplay       : %d\n"
 571                         "vblank start   : %d\n"
 572                         "hblank end     : %d\n"
 573                         "vsync start    : %d\n"
 574                         "vsync end      : %d\n"
 575                         "vtotal         : %d\n",
 576                         adjusted_mode->crtc_clock,
 577                         adjusted_mode->crtc_hdisplay,
 578                         adjusted_mode->crtc_hblank_start,
 579                         adjusted_mode->crtc_hblank_end,
 580                         adjusted_mode->crtc_hsync_start,
 581                         adjusted_mode->crtc_hsync_end,
 582                         adjusted_mode->crtc_htotal,
 583                         adjusted_mode->crtc_hskew,
 584                         adjusted_mode->crtc_vdisplay,
 585                         adjusted_mode->crtc_vblank_start,
 586                         adjusted_mode->crtc_vblank_end,
 587                         adjusted_mode->crtc_vsync_start,
 588                         adjusted_mode->crtc_vsync_end,
 589                         adjusted_mode->crtc_vtotal);
 590 
 591         if (mode->hdisplay == 640 && mode->vdisplay == 480)
 592                 mode_idx = MODE_640x480;
 593         else if (mode->hdisplay == 800 && mode->vdisplay == 600)
 594                 mode_idx = MODE_800x600;
 595         else if (mode->hdisplay == 1024 && mode->vdisplay == 768)
 596                 mode_idx = MODE_1024x768;
 597         else
 598                 return;
 599 
 600         /* Hopefully doing it every time won't hurt... */
 601         for (i = 0; i < ARRAY_SIZE(regs_init); i++)
 602                 ns2501_writeb(dvo, regs_init[i].offset, regs_init[i].value);
 603 
 604         /* Write the mode-agnostic values */
 605         for (i = 0; i < ARRAY_SIZE(mode_agnostic_values); i++)
 606                 ns2501_writeb(dvo, mode_agnostic_values[i].offset,
 607                                 mode_agnostic_values[i].value);
 608 
 609         /* Write now the mode-specific configuration */
 610         conf = ns2501_modes + mode_idx;
 611         ns->conf = conf;
 612 
 613         ns2501_writeb(dvo, NS2501_REG8, conf->conf);
 614         ns2501_writeb(dvo, NS2501_REG1B, conf->pll_a);
 615         ns2501_writeb(dvo, NS2501_REG1C, conf->pll_b & 0xff);
 616         ns2501_writeb(dvo, NS2501_REG1D, conf->pll_b >> 8);
 617         ns2501_writeb(dvo, NS2501_REGC1, conf->hstart & 0xff);
 618         ns2501_writeb(dvo, NS2501_REGC2, conf->hstart >> 8);
 619         ns2501_writeb(dvo, NS2501_REGC3, conf->hstop & 0xff);
 620         ns2501_writeb(dvo, NS2501_REGC4, conf->hstop >> 8);
 621         ns2501_writeb(dvo, NS2501_REGC5, conf->vstart & 0xff);
 622         ns2501_writeb(dvo, NS2501_REGC6, conf->vstart >> 8);
 623         ns2501_writeb(dvo, NS2501_REGC7, conf->vstop & 0xff);
 624         ns2501_writeb(dvo, NS2501_REGC8, conf->vstop >> 8);
 625         ns2501_writeb(dvo, NS2501_REG80, conf->vsync & 0xff);
 626         ns2501_writeb(dvo, NS2501_REG81, conf->vsync >> 8);
 627         ns2501_writeb(dvo, NS2501_REG82, conf->vtotal & 0xff);
 628         ns2501_writeb(dvo, NS2501_REG83, conf->vtotal >> 8);
 629         ns2501_writeb(dvo, NS2501_REG98, conf->hpos & 0xff);
 630         ns2501_writeb(dvo, NS2501_REG99, conf->hpos >> 8);
 631         ns2501_writeb(dvo, NS2501_REG8E, conf->vpos & 0xff);
 632         ns2501_writeb(dvo, NS2501_REG8F, conf->vpos >> 8);
 633         ns2501_writeb(dvo, NS2501_REG9C, conf->voffs & 0xff);
 634         ns2501_writeb(dvo, NS2501_REG9D, conf->voffs >> 8);
 635         ns2501_writeb(dvo, NS2501_REGB8, conf->hscale & 0xff);
 636         ns2501_writeb(dvo, NS2501_REGB9, conf->hscale >> 8);
 637         ns2501_writeb(dvo, NS2501_REG10, conf->vscale & 0xff);
 638         ns2501_writeb(dvo, NS2501_REG11, conf->vscale >> 8);
 639         ns2501_writeb(dvo, NS2501_REGF9, conf->dither);
 640         ns2501_writeb(dvo, NS2501_REG41, conf->syncb);
 641         ns2501_writeb(dvo, NS2501_REGC0, conf->sync);
 642 }
 643 
 644 /* set the NS2501 power state */
 645 static bool ns2501_get_hw_state(struct intel_dvo_device *dvo)
 646 {
 647         unsigned char ch;
 648 
 649         if (!ns2501_readb(dvo, NS2501_REG8, &ch))
 650                 return false;
 651 
 652         return ch & NS2501_8_PD;
 653 }
 654 
 655 /* set the NS2501 power state */
 656 static void ns2501_dpms(struct intel_dvo_device *dvo, bool enable)
 657 {
 658         struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
 659 
 660         DRM_DEBUG_KMS("Trying set the dpms of the DVO to %i\n", enable);
 661 
 662         if (enable) {
 663                 ns2501_writeb(dvo, NS2501_REGC0, ns->conf->sync | 0x08);
 664 
 665                 ns2501_writeb(dvo, NS2501_REG41, ns->conf->syncb);
 666 
 667                 ns2501_writeb(dvo, NS2501_REG34, NS2501_34_ENABLE_OUTPUT);
 668                 msleep(15);
 669 
 670                 ns2501_writeb(dvo, NS2501_REG8,
 671                                 ns->conf->conf | NS2501_8_BPAS);
 672                 if (!(ns->conf->conf & NS2501_8_BPAS))
 673                         ns2501_writeb(dvo, NS2501_REG8, ns->conf->conf);
 674                 msleep(200);
 675 
 676                 ns2501_writeb(dvo, NS2501_REG34,
 677                         NS2501_34_ENABLE_OUTPUT | NS2501_34_ENABLE_BACKLIGHT);
 678 
 679                 ns2501_writeb(dvo, NS2501_REGC0, ns->conf->sync);
 680         } else {
 681                 ns2501_writeb(dvo, NS2501_REG34, NS2501_34_ENABLE_OUTPUT);
 682                 msleep(200);
 683 
 684                 ns2501_writeb(dvo, NS2501_REG8, NS2501_8_VEN | NS2501_8_HEN |
 685                                 NS2501_8_BPAS);
 686                 msleep(15);
 687 
 688                 ns2501_writeb(dvo, NS2501_REG34, 0x00);
 689         }
 690 }
 691 
 692 static void ns2501_destroy(struct intel_dvo_device *dvo)
 693 {
 694         struct ns2501_priv *ns = dvo->dev_priv;
 695 
 696         if (ns) {
 697                 kfree(ns);
 698                 dvo->dev_priv = NULL;
 699         }
 700 }
 701 
 702 const struct intel_dvo_dev_ops ns2501_ops = {
 703         .init = ns2501_init,
 704         .detect = ns2501_detect,
 705         .mode_valid = ns2501_mode_valid,
 706         .mode_set = ns2501_mode_set,
 707         .dpms = ns2501_dpms,
 708         .get_hw_state = ns2501_get_hw_state,
 709         .destroy = ns2501_destroy,
 710 };