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
 158
 159 static void ivch_dump_regs(struct intel_dvo_device *dvo);
 160
 161 /**
 162  * Reads a register on the ivch.
 163  *
 164  * Each of the 256 registers are 16 bits long.
 165  */
 166 static bool ivch_read(struct intel_dvo_device *dvo, int addr, uint16_t *data)
 167 {
 168         struct ivch_priv *priv = dvo->dev_priv;
 169         struct i2c_adapter *adapter = dvo->i2c_bus;
 170         u8 out_buf[1];
 171         u8 in_buf[2];
 172
 173         struct i2c_msg msgs[] = {
 174                 {
 175                         .addr = dvo->slave_addr,
 176                         .flags = I2C_M_RD,
 177                         .len = 0,
 178                 },
 179                 {
 180                         .addr = 0,
 181                         .flags = I2C_M_NOSTART,
 182                         .len = 1,
 183                         .buf = out_buf,
 184                 },
 185                 {
 186                         .addr = dvo->slave_addr,
 187                         .flags = I2C_M_RD | I2C_M_NOSTART,
 188                         .len = 2,
 189                         .buf = in_buf,
 190                 }
 191         };
 192
 193         out_buf[0] = addr;
 194
 195         if (i2c_transfer(adapter, msgs, 3) == 3) {
 196                 *data = (in_buf[1] << 8) | in_buf[0];
 197                 return true;
 198         }
 199
 200         if (!priv->quiet) {
 201                 DRM_DEBUG_KMS("Unable to read register 0x%02x from "
 202                                 "%s:%02x.\n",
 203                           addr, adapter->name, dvo->slave_addr);
 204         }
 205         return false;
 206 }
 207
 208 /** Writes a 16-bit register on the ivch */
 209 static bool ivch_write(struct intel_dvo_device *dvo, int addr, uint16_t data)
 210 {
 211         struct ivch_priv *priv = dvo->dev_priv;
 212         struct i2c_adapter *adapter = dvo->i2c_bus;
 213         u8 out_buf[3];
 214         struct i2c_msg msg = {
 215                 .addr = dvo->slave_addr,
 216                 .flags = 0,
 217                 .len = 3,
 218                 .buf = out_buf,
 219         };
 220
 221         out_buf[0] = addr;
 222         out_buf[1] = data & 0xff;
 223         out_buf[2] = data >> 8;
 224
 225         if (i2c_transfer(adapter, &msg, 1) == 1)
 226                 return true;
 227
 228         if (!priv->quiet) {
 229                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 230                           addr, adapter->name, dvo->slave_addr);
 231         }
 232
 233         return false;
 234 }
 235
 236 /** Probes the given bus and slave address for an ivch */
 237 static bool ivch_init(struct intel_dvo_device *dvo,
 238                       struct i2c_adapter *adapter)
 239 {
 240         struct ivch_priv *priv;
 241         uint16_t temp;
 242
 243         priv = kzalloc(sizeof(struct ivch_priv), GFP_KERNEL);
 244         if (priv == NULL)
 245                 return false;
 246
 247         dvo->i2c_bus = adapter;
 248         dvo->dev_priv = priv;
 249         priv->quiet = true;
 250
 251         if (!ivch_read(dvo, VR00, &temp))
 252                 goto out;
 253         priv->quiet = false;
 254
 255         /* Since the identification bits are probably zeroes, which doesn't seem
 256          * very unique, check that the value in the base address field matches
 257          * the address it's responding on.
 258          */
 259         if ((temp & VR00_BASE_ADDRESS_MASK) != dvo->slave_addr) {
 260                 DRM_DEBUG_KMS("ivch detect failed due to address mismatch "
 261                           "(%d vs %d)\n",
 262                           (temp & VR00_BASE_ADDRESS_MASK), dvo->slave_addr);
 263                 goto out;
 264         }
 265
 266         ivch_read(dvo, VR20, &priv->width);
 267         ivch_read(dvo, VR21, &priv->height);
 268
 269         return true;
 270
 271 out:
 272         kfree(priv);
 273         return false;
 274 }
 275
 276 static enum drm_connector_status ivch_detect(struct intel_dvo_device *dvo)
 277 {
 278         return connector_status_connected;
 279 }
 280
 281 static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo,
 282                                             struct drm_display_mode *mode)
 283 {
 284         if (mode->clock > 112000)
 285                 return MODE_CLOCK_HIGH;
 286
 287         return MODE_OK;
 288 }
 289
 290 /** Sets the power state of the panel connected to the ivch */
 291 static void ivch_dpms(struct intel_dvo_device *dvo, bool enable)
 292 {
 293         int i;
 294         uint16_t vr01, vr30, backlight;
 295
 296         /* Set the new power state of the panel. */
 297         if (!ivch_read(dvo, VR01, &vr01))
 298                 return;
 299
 300         if (enable)
 301                 backlight = 1;
 302         else
 303                 backlight = 0;
 304         ivch_write(dvo, VR80, backlight);
 305
 306         if (enable)
 307                 vr01 |= VR01_LCD_ENABLE | VR01_DVO_ENABLE;
 308         else
 309                 vr01 &= ~(VR01_LCD_ENABLE | VR01_DVO_ENABLE);
 310
 311         ivch_write(dvo, VR01, vr01);
 312
 313         /* Wait for the panel to make its state transition */
 314         for (i = 0; i < 100; i++) {
 315                 if (!ivch_read(dvo, VR30, &vr30))
 316                         break;
 317
 318                 if (((vr30 & VR30_PANEL_ON) != 0) == enable)
 319                         break;
 320                 udelay(1000);
 321         }
 322         /* wait some more; vch may fail to resync sometimes without this */
 323         udelay(16 * 1000);
 324 }
 325
 326 static bool ivch_get_hw_state(struct intel_dvo_device *dvo)
 327 {
 328         uint16_t vr01;
 329
 330         /* Set the new power state of the panel. */
 331         if (!ivch_read(dvo, VR01, &vr01))
 332                 return false;
 333
 334         if (vr01 & VR01_LCD_ENABLE)
 335                 return true;
 336         else
 337                 return false;
 338 }
 339
 340 static void ivch_mode_set(struct intel_dvo_device *dvo,
 341                           struct drm_display_mode *mode,
 342                           struct drm_display_mode *adjusted_mode)
 343 {
 344         uint16_t vr40 = 0;
 345         uint16_t vr01;
 346
 347         vr01 = 0;
 348         vr40 = (VR40_STALL_ENABLE | VR40_VERTICAL_INTERP_ENABLE |
 349                 VR40_HORIZONTAL_INTERP_ENABLE);
 350
 351         if (mode->hdisplay != adjusted_mode->hdisplay ||
 352             mode->vdisplay != adjusted_mode->vdisplay) {
 353                 uint16_t x_ratio, y_ratio;
 354
 355                 vr01 |= VR01_PANEL_FIT_ENABLE;
 356                 vr40 |= VR40_CLOCK_GATING_ENABLE;
 357                 x_ratio = (((mode->hdisplay - 1) << 16) /
 358                            (adjusted_mode->hdisplay - 1)) >> 2;
 359                 y_ratio = (((mode->vdisplay - 1) << 16) /
 360                            (adjusted_mode->vdisplay - 1)) >> 2;
 361                 ivch_write(dvo, VR42, x_ratio);
 362                 ivch_write(dvo, VR41, y_ratio);
 363         } else {
 364                 vr01 &= ~VR01_PANEL_FIT_ENABLE;
 365                 vr40 &= ~VR40_CLOCK_GATING_ENABLE;
 366         }
 367         vr40 &= ~VR40_AUTO_RATIO_ENABLE;
 368
 369         ivch_write(dvo, VR01, vr01);
 370         ivch_write(dvo, VR40, vr40);
 371
 372         ivch_dump_regs(dvo);
 373 }
 374
 375 static void ivch_dump_regs(struct intel_dvo_device *dvo)
 376 {
 377         uint16_t val;
 378
 379         ivch_read(dvo, VR00, &val);
 380         DRM_DEBUG_KMS("VR00: 0x%04x\n", val);
 381         ivch_read(dvo, VR01, &val);
 382         DRM_DEBUG_KMS("VR01: 0x%04x\n", val);
 383         ivch_read(dvo, VR30, &val);
 384         DRM_DEBUG_KMS("VR30: 0x%04x\n", val);
 385         ivch_read(dvo, VR40, &val);
 386         DRM_DEBUG_KMS("VR40: 0x%04x\n", val);
 387
 388         /* GPIO registers */
 389         ivch_read(dvo, VR80, &val);
 390         DRM_DEBUG_KMS("VR80: 0x%04x\n", val);
 391         ivch_read(dvo, VR81, &val);
 392         DRM_DEBUG_KMS("VR81: 0x%04x\n", val);
 393         ivch_read(dvo, VR82, &val);
 394         DRM_DEBUG_KMS("VR82: 0x%04x\n", val);
 395         ivch_read(dvo, VR83, &val);
 396         DRM_DEBUG_KMS("VR83: 0x%04x\n", val);
 397         ivch_read(dvo, VR84, &val);
 398         DRM_DEBUG_KMS("VR84: 0x%04x\n", val);
 399         ivch_read(dvo, VR85, &val);
 400         DRM_DEBUG_KMS("VR85: 0x%04x\n", val);
 401         ivch_read(dvo, VR86, &val);
 402         DRM_DEBUG_KMS("VR86: 0x%04x\n", val);
 403         ivch_read(dvo, VR87, &val);
 404         DRM_DEBUG_KMS("VR87: 0x%04x\n", val);
 405         ivch_read(dvo, VR88, &val);
 406         DRM_DEBUG_KMS("VR88: 0x%04x\n", val);
 407
 408         /* Scratch register 0 - AIM Panel type */
 409         ivch_read(dvo, VR8E, &val);
 410         DRM_DEBUG_KMS("VR8E: 0x%04x\n", val);
 411
 412         /* Scratch register 1 - Status register */
 413         ivch_read(dvo, VR8F, &val);
 414         DRM_DEBUG_KMS("VR8F: 0x%04x\n", val);
 415 }
 416
 417 static void ivch_destroy(struct intel_dvo_device *dvo)
 418 {
 419         struct ivch_priv *priv = dvo->dev_priv;
 420
 421         if (priv) {
 422                 kfree(priv);
 423                 dvo->dev_priv = NULL;
 424         }
 425 }
 426
 427 struct intel_dvo_dev_ops ivch_ops = {
 428         .init = ivch_init,
 429         .dpms = ivch_dpms,
 430         .get_hw_state = ivch_get_hw_state,
 431         .mode_valid = ivch_mode_valid,
 432         .mode_set = ivch_mode_set,
 433         .detect = ivch_detect,
 434         .dump_regs = ivch_dump_regs,
 435         .destroy = ivch_destroy,
 436 };