drivers/gpu/drm/i915/dvo_ivch.c

   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "dvo.h"
  29
  30 /*
  31  * register definitions for the i82807aa.
  32  *
  33  * Documentation on this chipset can be found in datasheet #29069001 at
  34  * intel.com.
  35  */
  36
  37 /*
  38  * VCH Revision & GMBus Base Addr
  39  */
  40 #define VR00            0x00
  41 # define VR00_BASE_ADDRESS_MASK         0x007f
  42
  43 /*
  44  * Functionality Enable
  45  */
  46 #define VR01            0x01
  47
  48 /*
  49  * Enable the panel fitter
  50  */
  51 # define VR01_PANEL_FIT_ENABLE          (1 << 3)
  52 /*
  53  * Enables the LCD display.
  54  *
  55  * This must not be set while VR01_DVO_BYPASS_ENABLE is set.
  56  */
  57 # define VR01_LCD_ENABLE                (1 << 2)
  58 /** Enables the DVO repeater. */
  59 # define VR01_DVO_BYPASS_ENABLE         (1 << 1)
  60 /** Enables the DVO clock */
  61 # define VR01_DVO_ENABLE                (1 << 0)
  62
  63 /*
  64  * LCD Interface Format
  65  */
  66 #define VR10            0x10
  67 /** Enables LVDS output instead of CMOS */
  68 # define VR10_LVDS_ENABLE               (1 << 4)
  69 /** Enables 18-bit LVDS output. */
  70 # define VR10_INTERFACE_1X18            (0 << 2)
  71 /** Enables 24-bit LVDS or CMOS output */
  72 # define VR10_INTERFACE_1X24            (1 << 2)
  73 /** Enables 2x18-bit LVDS or CMOS output. */
  74 # define VR10_INTERFACE_2X18            (2 << 2)
  75 /** Enables 2x24-bit LVDS output */
  76 # define VR10_INTERFACE_2X24            (3 << 2)
  77
  78 /*
  79  * VR20 LCD Horizontal Display Size
  80  */
  81 #define VR20    0x20
  82
  83 /*
  84  * LCD Vertical Display Size
  85  */
  86 #define VR21    0x20
  87
  88 /*
  89  * Panel power down status
  90  */
  91 #define VR30            0x30
  92 /** Read only bit indicating that the panel is not in a safe poweroff state. */
  93 # define VR30_PANEL_ON                  (1 << 15)
  94
  95 #define VR40            0x40
  96 # define VR40_STALL_ENABLE              (1 << 13)
  97 # define VR40_VERTICAL_INTERP_ENABLE    (1 << 12)
  98 # define VR40_ENHANCED_PANEL_FITTING    (1 << 11)
  99 # define VR40_HORIZONTAL_INTERP_ENABLE  (1 << 10)
 100 # define VR40_AUTO_RATIO_ENABLE         (1 << 9)
 101 # define VR40_CLOCK_GATING_ENABLE       (1 << 8)
 102
 103 /*
 104  * Panel Fitting Vertical Ratio
 105  * (((image_height - 1) << 16) / ((panel_height - 1))) >> 2
 106  */
 107 #define VR41            0x41
 108
 109 /*
 110  * Panel Fitting Horizontal Ratio
 111  * (((image_width - 1) << 16) / ((panel_width - 1))) >> 2
 112  */
 113 #define VR42            0x42
 114
 115 /*
 116  * Horizontal Image Size
 117  */
 118 #define VR43            0x43
 119
 120 /* VR80 GPIO 0
 121  */
 122 #define VR80        0x80
 123 #define VR81        0x81
 124 #define VR82        0x82
 125 #define VR83        0x83
 126 #define VR84        0x84
 127 #define VR85        0x85
 128 #define VR86        0x86
 129 #define VR87        0x87
 130
 131 /* VR88 GPIO 8
 132  */
 133 #define VR88        0x88
 134
 135 /* Graphics BIOS scratch 0
 136  */
 137 #define VR8E        0x8E
 138 # define VR8E_PANEL_TYPE_MASK           (0xf << 0)
 139 # define VR8E_PANEL_INTERFACE_CMOS      (0 << 4)
 140 # define VR8E_PANEL_INTERFACE_LVDS      (1 << 4)
 141 # define VR8E_FORCE_DEFAULT_PANEL       (1 << 5)
 142
 143 /* Graphics BIOS scratch 1
 144  */
 145 #define VR8F        0x8F
 146 # define VR8F_VCH_PRESENT               (1 << 0)
 147 # define VR8F_DISPLAY_CONN              (1 << 1)
 148 # define VR8F_POWER_MASK                (0x3c)
 149 # define VR8F_POWER_POS                 (2)
 150
 151
 152 struct ivch_priv {
 153         bool quiet;
 154
 155         uint16_t width, height;
 156
 157         uint16_t save_VR01;
 158         uint16_t save_VR40;
 159 };
 160
 161
 162 static void ivch_dump_regs(struct intel_dvo_device *dvo);
 163
 164 /**
 165  * Reads a register on the ivch.
 166  *
 167  * Each of the 256 registers are 16 bits long.
 168  */
 169 static bool ivch_read(struct intel_dvo_device *dvo, int addr, uint16_t *data)
 170 {
 171         struct ivch_priv *priv = dvo->dev_priv;
 172         struct intel_i2c_chan *i2cbus = dvo->i2c_bus;
 173         u8 out_buf[1];
 174         u8 in_buf[2];
 175
 176         struct i2c_msg msgs[] = {
 177                 {
 178                         .addr = i2cbus->slave_addr,
 179                         .flags = I2C_M_RD,
 180                         .len = 0,
 181                 },
 182                 {
 183                         .addr = 0,
 184                         .flags = I2C_M_NOSTART,
 185                         .len = 1,
 186                         .buf = out_buf,
 187                 },
 188                 {
 189                         .addr = i2cbus->slave_addr,
 190                         .flags = I2C_M_RD | I2C_M_NOSTART,
 191                         .len = 2,
 192                         .buf = in_buf,
 193                 }
 194         };
 195
 196         out_buf[0] = addr;
 197
 198         if (i2c_transfer(&i2cbus->adapter, msgs, 3) == 3) {
 199                 *data = (in_buf[1] << 8) | in_buf[0];
 200                 return true;
 201         };
 202
 203         if (!priv->quiet) {
 204                 DRM_DEBUG("Unable to read register 0x%02x from %s:%02x.\n",
 205                           addr, i2cbus->adapter.name, i2cbus->slave_addr);
 206         }
 207         return false;
 208 }
 209
 210 /** Writes a 16-bit register on the ivch */
 211 static bool ivch_write(struct intel_dvo_device *dvo, int addr, uint16_t data)
 212 {
 213         struct ivch_priv *priv = dvo->dev_priv;
 214         struct intel_i2c_chan *i2cbus = dvo->i2c_bus;
 215         u8 out_buf[3];
 216         struct i2c_msg msg = {
 217                 .addr = i2cbus->slave_addr,
 218                 .flags = 0,
 219                 .len = 3,
 220                 .buf = out_buf,
 221         };
 222
 223         out_buf[0] = addr;
 224         out_buf[1] = data & 0xff;
 225         out_buf[2] = data >> 8;
 226
 227         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
 228                 return true;
 229
 230         if (!priv->quiet) {
 231                 DRM_DEBUG("Unable to write register 0x%02x to %s:%d.\n",
 232                           addr, i2cbus->adapter.name, i2cbus->slave_addr);
 233         }
 234
 235         return false;
 236 }
 237
 238 /** Probes the given bus and slave address for an ivch */
 239 static bool ivch_init(struct intel_dvo_device *dvo,
 240                       struct intel_i2c_chan *i2cbus)
 241 {
 242         struct ivch_priv *priv;
 243         uint16_t temp;
 244
 245         priv = kzalloc(sizeof(struct ivch_priv), GFP_KERNEL);
 246         if (priv == NULL)
 247                 return false;
 248
 249         dvo->i2c_bus = i2cbus;
 250         dvo->i2c_bus->slave_addr = dvo->slave_addr;
 251         dvo->dev_priv = priv;
 252         priv->quiet = true;
 253
 254         if (!ivch_read(dvo, VR00, &temp))
 255                 goto out;
 256         priv->quiet = false;
 257
 258         /* Since the identification bits are probably zeroes, which doesn't seem
 259          * very unique, check that the value in the base address field matches
 260          * the address it's responding on.
 261          */
 262         if ((temp & VR00_BASE_ADDRESS_MASK) != dvo->slave_addr) {
 263                 DRM_DEBUG("ivch detect failed due to address mismatch "
 264                           "(%d vs %d)\n",
 265                           (temp & VR00_BASE_ADDRESS_MASK), dvo->slave_addr);
 266                 goto out;
 267         }
 268
 269         ivch_read(dvo, VR20, &priv->width);
 270         ivch_read(dvo, VR21, &priv->height);
 271
 272         return true;
 273
 274 out:
 275         kfree(priv);
 276         return false;
 277 }
 278
 279 static enum drm_connector_status ivch_detect(struct intel_dvo_device *dvo)
 280 {
 281         return connector_status_connected;
 282 }
 283
 284 static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo,
 285                                             struct drm_display_mode *mode)
 286 {
 287         if (mode->clock > 112000)
 288                 return MODE_CLOCK_HIGH;
 289
 290         return MODE_OK;
 291 }
 292
 293 /** Sets the power state of the panel connected to the ivch */
 294 static void ivch_dpms(struct intel_dvo_device *dvo, int mode)
 295 {
 296         int i;
 297         uint16_t vr01, vr30, backlight;
 298
 299         /* Set the new power state of the panel. */
 300         if (!ivch_read(dvo, VR01, &vr01))
 301                 return;
 302
 303         if (mode == DRM_MODE_DPMS_ON)
 304                 backlight = 1;
 305         else
 306                 backlight = 0;
 307         ivch_write(dvo, VR80, backlight);
 308
 309         if (mode == DRM_MODE_DPMS_ON)
 310                 vr01 |= VR01_LCD_ENABLE | VR01_DVO_ENABLE;
 311         else
 312                 vr01 &= ~(VR01_LCD_ENABLE | VR01_DVO_ENABLE);
 313
 314         ivch_write(dvo, VR01, vr01);
 315
 316         /* Wait for the panel to make its state transition */
 317         for (i = 0; i < 100; i++) {
 318                 if (!ivch_read(dvo, VR30, &vr30))
 319                         break;
 320
 321                 if (((vr30 & VR30_PANEL_ON) != 0) == (mode == DRM_MODE_DPMS_ON))
 322                         break;
 323                 udelay(1000);
 324         }
 325         /* wait some more; vch may fail to resync sometimes without this */
 326         udelay(16 * 1000);
 327 }
 328
 329 static void ivch_mode_set(struct intel_dvo_device *dvo,
 330                           struct drm_display_mode *mode,
 331                           struct drm_display_mode *adjusted_mode)
 332 {
 333         uint16_t vr40 = 0;
 334         uint16_t vr01;
 335
 336         vr01 = 0;
 337         vr40 = (VR40_STALL_ENABLE | VR40_VERTICAL_INTERP_ENABLE |
 338                 VR40_HORIZONTAL_INTERP_ENABLE);
 339
 340         if (mode->hdisplay != adjusted_mode->hdisplay ||
 341             mode->vdisplay != adjusted_mode->vdisplay) {
 342                 uint16_t x_ratio, y_ratio;
 343
 344                 vr01 |= VR01_PANEL_FIT_ENABLE;
 345                 vr40 |= VR40_CLOCK_GATING_ENABLE;
 346                 x_ratio = (((mode->hdisplay - 1) << 16) /
 347                            (adjusted_mode->hdisplay - 1)) >> 2;
 348                 y_ratio = (((mode->vdisplay - 1) << 16) /
 349                            (adjusted_mode->vdisplay - 1)) >> 2;
 350                 ivch_write (dvo, VR42, x_ratio);
 351                 ivch_write (dvo, VR41, y_ratio);
 352         } else {
 353                 vr01 &= ~VR01_PANEL_FIT_ENABLE;
 354                 vr40 &= ~VR40_CLOCK_GATING_ENABLE;
 355         }
 356         vr40 &= ~VR40_AUTO_RATIO_ENABLE;
 357
 358         ivch_write(dvo, VR01, vr01);
 359         ivch_write(dvo, VR40, vr40);
 360
 361         ivch_dump_regs(dvo);
 362 }
 363
 364 static void ivch_dump_regs(struct intel_dvo_device *dvo)
 365 {
 366         uint16_t val;
 367
 368         ivch_read(dvo, VR00, &val);
 369         DRM_DEBUG("VR00: 0x%04x\n", val);
 370         ivch_read(dvo, VR01, &val);
 371         DRM_DEBUG("VR01: 0x%04x\n", val);
 372         ivch_read(dvo, VR30, &val);
 373         DRM_DEBUG("VR30: 0x%04x\n", val);
 374         ivch_read(dvo, VR40, &val);
 375         DRM_DEBUG("VR40: 0x%04x\n", val);
 376
 377         /* GPIO registers */
 378         ivch_read(dvo, VR80, &val);
 379         DRM_DEBUG("VR80: 0x%04x\n", val);
 380         ivch_read(dvo, VR81, &val);
 381         DRM_DEBUG("VR81: 0x%04x\n", val);
 382         ivch_read(dvo, VR82, &val);
 383         DRM_DEBUG("VR82: 0x%04x\n", val);
 384         ivch_read(dvo, VR83, &val);
 385         DRM_DEBUG("VR83: 0x%04x\n", val);
 386         ivch_read(dvo, VR84, &val);
 387         DRM_DEBUG("VR84: 0x%04x\n", val);
 388         ivch_read(dvo, VR85, &val);
 389         DRM_DEBUG("VR85: 0x%04x\n", val);
 390         ivch_read(dvo, VR86, &val);
 391         DRM_DEBUG("VR86: 0x%04x\n", val);
 392         ivch_read(dvo, VR87, &val);
 393         DRM_DEBUG("VR87: 0x%04x\n", val);
 394         ivch_read(dvo, VR88, &val);
 395         DRM_DEBUG("VR88: 0x%04x\n", val);
 396
 397         /* Scratch register 0 - AIM Panel type */
 398         ivch_read(dvo, VR8E, &val);
 399         DRM_DEBUG("VR8E: 0x%04x\n", val);
 400
 401         /* Scratch register 1 - Status register */
 402         ivch_read(dvo, VR8F, &val);
 403         DRM_DEBUG("VR8F: 0x%04x\n", val);
 404 }
 405
 406 static void ivch_save(struct intel_dvo_device *dvo)
 407 {
 408         struct ivch_priv *priv = dvo->dev_priv;
 409
 410         ivch_read(dvo, VR01, &priv->save_VR01);
 411         ivch_read(dvo, VR40, &priv->save_VR40);
 412 }
 413
 414 static void ivch_restore(struct intel_dvo_device *dvo)
 415 {
 416         struct ivch_priv *priv = dvo->dev_priv;
 417
 418         ivch_write(dvo, VR01, priv->save_VR01);
 419         ivch_write(dvo, VR40, priv->save_VR40);
 420 }
 421
 422 static void ivch_destroy(struct intel_dvo_device *dvo)
 423 {
 424         struct ivch_priv *priv = dvo->dev_priv;
 425
 426         if (priv) {
 427                 kfree(priv);
 428                 dvo->dev_priv = NULL;
 429         }
 430 }
 431
 432 struct intel_dvo_dev_ops ivch_ops= {
 433         .init = ivch_init,
 434         .dpms = ivch_dpms,
 435         .save = ivch_save,
 436         .restore = ivch_restore,
 437         .mode_valid = ivch_mode_valid,
 438         .mode_set = ivch_mode_set,
 439         .detect = ivch_detect,
 440         .dump_regs = ivch_dump_regs,
 441         .destroy = ivch_destroy,
 442 };