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 * Thomas Richter <thor@math.tu-berlin.de> 26 * 27 * Minor modifications (Dithering enable): 28 * Thomas Richter <thor@math.tu-berlin.de> 29 * 30 */ 31 32 #include "dvo.h" 33 34 /* 35 * register definitions for the i82807aa. 36 * 37 * Documentation on this chipset can be found in datasheet #29069001 at 38 * intel.com. 39 */ 40 41 /* 42 * VCH Revision & GMBus Base Addr 43 */ 44 #define VR00 0x00 45 # define VR00_BASE_ADDRESS_MASK 0x007f 46 47 /* 48 * Functionality Enable 49 */ 50 #define VR01 0x01 51 52 /* 53 * Enable the panel fitter 54 */ 55 # define VR01_PANEL_FIT_ENABLE (1 << 3) 56 /* 57 * Enables the LCD display. 58 * 59 * This must not be set while VR01_DVO_BYPASS_ENABLE is set. 60 */ 61 # define VR01_LCD_ENABLE (1 << 2) 62 /** Enables the DVO repeater. */ 63 # define VR01_DVO_BYPASS_ENABLE (1 << 1) 64 /** Enables the DVO clock */ 65 # define VR01_DVO_ENABLE (1 << 0) 66 /** Enable dithering for 18bpp panels. Not documented. */ 67 # define VR01_DITHER_ENABLE (1 << 4) 68 69 /* 70 * LCD Interface Format 71 */ 72 #define VR10 0x10 73 /** Enables LVDS output instead of CMOS */ 74 # define VR10_LVDS_ENABLE (1 << 4) 75 /** Enables 18-bit LVDS output. */ 76 # define VR10_INTERFACE_1X18 (0 << 2) 77 /** Enables 24-bit LVDS or CMOS output */ 78 # define VR10_INTERFACE_1X24 (1 << 2) 79 /** Enables 2x18-bit LVDS or CMOS output. */ 80 # define VR10_INTERFACE_2X18 (2 << 2) 81 /** Enables 2x24-bit LVDS output */ 82 # define VR10_INTERFACE_2X24 (3 << 2) 83 /** Mask that defines the depth of the pipeline */ 84 # define VR10_INTERFACE_DEPTH_MASK (3 << 2) 85 86 /* 87 * VR20 LCD Horizontal Display Size 88 */ 89 #define VR20 0x20 90 91 /* 92 * LCD Vertical Display Size 93 */ 94 #define VR21 0x21 95 96 /* 97 * Panel power down status 98 */ 99 #define VR30 0x30 100 /** Read only bit indicating that the panel is not in a safe poweroff state. */ 101 # define VR30_PANEL_ON (1 << 15) 102 103 #define VR40 0x40 104 # define VR40_STALL_ENABLE (1 << 13) 105 # define VR40_VERTICAL_INTERP_ENABLE (1 << 12) 106 # define VR40_ENHANCED_PANEL_FITTING (1 << 11) 107 # define VR40_HORIZONTAL_INTERP_ENABLE (1 << 10) 108 # define VR40_AUTO_RATIO_ENABLE (1 << 9) 109 # define VR40_CLOCK_GATING_ENABLE (1 << 8) 110 111 /* 112 * Panel Fitting Vertical Ratio 113 * (((image_height - 1) << 16) / ((panel_height - 1))) >> 2 114 */ 115 #define VR41 0x41 116 117 /* 118 * Panel Fitting Horizontal Ratio 119 * (((image_width - 1) << 16) / ((panel_width - 1))) >> 2 120 */ 121 #define VR42 0x42 122 123 /* 124 * Horizontal Image Size 125 */ 126 #define VR43 0x43 127 128 /* VR80 GPIO 0 129 */ 130 #define VR80 0x80 131 #define VR81 0x81 132 #define VR82 0x82 133 #define VR83 0x83 134 #define VR84 0x84 135 #define VR85 0x85 136 #define VR86 0x86 137 #define VR87 0x87 138 139 /* VR88 GPIO 8 140 */ 141 #define VR88 0x88 142 143 /* Graphics BIOS scratch 0 144 */ 145 #define VR8E 0x8E 146 # define VR8E_PANEL_TYPE_MASK (0xf << 0) 147 # define VR8E_PANEL_INTERFACE_CMOS (0 << 4) 148 # define VR8E_PANEL_INTERFACE_LVDS (1 << 4) 149 # define VR8E_FORCE_DEFAULT_PANEL (1 << 5) 150 151 /* Graphics BIOS scratch 1 152 */ 153 #define VR8F 0x8F 154 # define VR8F_VCH_PRESENT (1 << 0) 155 # define VR8F_DISPLAY_CONN (1 << 1) 156 # define VR8F_POWER_MASK (0x3c) 157 # define VR8F_POWER_POS (2) 158 159 /* Some Bios implementations do not restore the DVO state upon 160 * resume from standby. Thus, this driver has to handle it 161 * instead. The following list contains all registers that 162 * require saving. 163 */ 164 static const uint16_t backup_addresses[] = { 165 0x11, 0x12, 166 0x18, 0x19, 0x1a, 0x1f, 167 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 168 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 169 0x8e, 0x8f, 170 0x10 /* this must come last */ 171 }; 172 173 174 struct ivch_priv { 175 bool quiet; 176 177 uint16_t width, height; 178 179 /* Register backup */ 180 181 uint16_t reg_backup[ARRAY_SIZE(backup_addresses)]; 182 }; 183 184 185 static void ivch_dump_regs(struct intel_dvo_device *dvo); 186 /** 187 * Reads a register on the ivch. 188 * 189 * Each of the 256 registers are 16 bits long. 190 */ 191 static bool ivch_read(struct intel_dvo_device *dvo, int addr, uint16_t *data) 192 { 193 struct ivch_priv *priv = dvo->dev_priv; 194 struct i2c_adapter *adapter = dvo->i2c_bus; 195 u8 out_buf[1]; 196 u8 in_buf[2]; 197 198 struct i2c_msg msgs[] = { 199 { 200 .addr = dvo->slave_addr, 201 .flags = I2C_M_RD, 202 .len = 0, 203 }, 204 { 205 .addr = 0, 206 .flags = I2C_M_NOSTART, 207 .len = 1, 208 .buf = out_buf, 209 }, 210 { 211 .addr = dvo->slave_addr, 212 .flags = I2C_M_RD | I2C_M_NOSTART, 213 .len = 2, 214 .buf = in_buf, 215 } 216 }; 217 218 out_buf[0] = addr; 219 220 if (i2c_transfer(adapter, msgs, 3) == 3) { 221 *data = (in_buf[1] << 8) | in_buf[0]; 222 return true; 223 } 224 225 if (!priv->quiet) { 226 DRM_DEBUG_KMS("Unable to read register 0x%02x from " 227 "%s:%02x.\n", 228 addr, adapter->name, dvo->slave_addr); 229 } 230 return false; 231 } 232 233 /** Writes a 16-bit register on the ivch */ 234 static bool ivch_write(struct intel_dvo_device *dvo, int addr, uint16_t data) 235 { 236 struct ivch_priv *priv = dvo->dev_priv; 237 struct i2c_adapter *adapter = dvo->i2c_bus; 238 u8 out_buf[3]; 239 struct i2c_msg msg = { 240 .addr = dvo->slave_addr, 241 .flags = 0, 242 .len = 3, 243 .buf = out_buf, 244 }; 245 246 out_buf[0] = addr; 247 out_buf[1] = data & 0xff; 248 out_buf[2] = data >> 8; 249 250 if (i2c_transfer(adapter, &msg, 1) == 1) 251 return true; 252 253 if (!priv->quiet) { 254 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n", 255 addr, adapter->name, dvo->slave_addr); 256 } 257 258 return false; 259 } 260 261 /** Probes the given bus and slave address for an ivch */ 262 static bool ivch_init(struct intel_dvo_device *dvo, 263 struct i2c_adapter *adapter) 264 { 265 struct ivch_priv *priv; 266 uint16_t temp; 267 int i; 268 269 priv = kzalloc(sizeof(struct ivch_priv), GFP_KERNEL); 270 if (priv == NULL) 271 return false; 272 273 dvo->i2c_bus = adapter; 274 dvo->dev_priv = priv; 275 priv->quiet = true; 276 277 if (!ivch_read(dvo, VR00, &temp)) 278 goto out; 279 priv->quiet = false; 280 281 /* Since the identification bits are probably zeroes, which doesn't seem 282 * very unique, check that the value in the base address field matches 283 * the address it's responding on. 284 */ 285 if ((temp & VR00_BASE_ADDRESS_MASK) != dvo->slave_addr) { 286 DRM_DEBUG_KMS("ivch detect failed due to address mismatch " 287 "(%d vs %d)\n", 288 (temp & VR00_BASE_ADDRESS_MASK), dvo->slave_addr); 289 goto out; 290 } 291 292 ivch_read(dvo, VR20, &priv->width); 293 ivch_read(dvo, VR21, &priv->height); 294 295 /* Make a backup of the registers to be able to restore them 296 * upon suspend. 297 */ 298 for (i = 0; i < ARRAY_SIZE(backup_addresses); i++) 299 ivch_read(dvo, backup_addresses[i], priv->reg_backup + i); 300 301 ivch_dump_regs(dvo); 302 303 return true; 304 305 out: 306 kfree(priv); 307 return false; 308 } 309 310 static enum drm_connector_status ivch_detect(struct intel_dvo_device *dvo) 311 { 312 return connector_status_connected; 313 } 314 315 static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo, 316 struct drm_display_mode *mode) 317 { 318 if (mode->clock > 112000) 319 return MODE_CLOCK_HIGH; 320 321 return MODE_OK; 322 } 323 324 /* Restore the DVO registers after a resume 325 * from RAM. Registers have been saved during 326 * the initialization. 327 */ 328 static void ivch_reset(struct intel_dvo_device *dvo) 329 { 330 struct ivch_priv *priv = dvo->dev_priv; 331 int i; 332 333 DRM_DEBUG_KMS("Resetting the IVCH registers\n"); 334 335 ivch_write(dvo, VR10, 0x0000); 336 337 for (i = 0; i < ARRAY_SIZE(backup_addresses); i++) 338 ivch_write(dvo, backup_addresses[i], priv->reg_backup[i]); 339 } 340 341 /** Sets the power state of the panel connected to the ivch */ 342 static void ivch_dpms(struct intel_dvo_device *dvo, bool enable) 343 { 344 int i; 345 uint16_t vr01, vr30, backlight; 346 347 ivch_reset(dvo); 348 349 /* Set the new power state of the panel. */ 350 if (!ivch_read(dvo, VR01, &vr01)) 351 return; 352 353 if (enable) 354 backlight = 1; 355 else 356 backlight = 0; 357 358 ivch_write(dvo, VR80, backlight); 359 360 if (enable) 361 vr01 |= VR01_LCD_ENABLE | VR01_DVO_ENABLE; 362 else 363 vr01 &= ~(VR01_LCD_ENABLE | VR01_DVO_ENABLE); 364 365 ivch_write(dvo, VR01, vr01); 366 367 /* Wait for the panel to make its state transition */ 368 for (i = 0; i < 100; i++) { 369 if (!ivch_read(dvo, VR30, &vr30)) 370 break; 371 372 if (((vr30 & VR30_PANEL_ON) != 0) == enable) 373 break; 374 udelay(1000); 375 } 376 /* wait some more; vch may fail to resync sometimes without this */ 377 udelay(16 * 1000); 378 } 379 380 static bool ivch_get_hw_state(struct intel_dvo_device *dvo) 381 { 382 uint16_t vr01; 383 384 ivch_reset(dvo); 385 386 /* Set the new power state of the panel. */ 387 if (!ivch_read(dvo, VR01, &vr01)) 388 return false; 389 390 if (vr01 & VR01_LCD_ENABLE) 391 return true; 392 else 393 return false; 394 } 395 396 static void ivch_mode_set(struct intel_dvo_device *dvo, 397 const struct drm_display_mode *mode, 398 const struct drm_display_mode *adjusted_mode) 399 { 400 struct ivch_priv *priv = dvo->dev_priv; 401 uint16_t vr40 = 0; 402 uint16_t vr01 = 0; 403 uint16_t vr10; 404 405 ivch_reset(dvo); 406 407 vr10 = priv->reg_backup[ARRAY_SIZE(backup_addresses) - 1]; 408 409 /* Enable dithering for 18 bpp pipelines */ 410 vr10 &= VR10_INTERFACE_DEPTH_MASK; 411 if (vr10 == VR10_INTERFACE_2X18 || vr10 == VR10_INTERFACE_1X18) 412 vr01 = VR01_DITHER_ENABLE; 413 414 vr40 = (VR40_STALL_ENABLE | VR40_VERTICAL_INTERP_ENABLE | 415 VR40_HORIZONTAL_INTERP_ENABLE); 416 417 if (mode->hdisplay != adjusted_mode->crtc_hdisplay || 418 mode->vdisplay != adjusted_mode->crtc_vdisplay) { 419 uint16_t x_ratio, y_ratio; 420 421 vr01 |= VR01_PANEL_FIT_ENABLE; 422 vr40 |= VR40_CLOCK_GATING_ENABLE; 423 x_ratio = (((mode->hdisplay - 1) << 16) / 424 (adjusted_mode->crtc_hdisplay - 1)) >> 2; 425 y_ratio = (((mode->vdisplay - 1) << 16) / 426 (adjusted_mode->crtc_vdisplay - 1)) >> 2; 427 ivch_write(dvo, VR42, x_ratio); 428 ivch_write(dvo, VR41, y_ratio); 429 } else { 430 vr01 &= ~VR01_PANEL_FIT_ENABLE; 431 vr40 &= ~VR40_CLOCK_GATING_ENABLE; 432 } 433 vr40 &= ~VR40_AUTO_RATIO_ENABLE; 434 435 ivch_write(dvo, VR01, vr01); 436 ivch_write(dvo, VR40, vr40); 437 } 438 439 static void ivch_dump_regs(struct intel_dvo_device *dvo) 440 { 441 uint16_t val; 442 443 ivch_read(dvo, VR00, &val); 444 DRM_DEBUG_KMS("VR00: 0x%04x\n", val); 445 ivch_read(dvo, VR01, &val); 446 DRM_DEBUG_KMS("VR01: 0x%04x\n", val); 447 ivch_read(dvo, VR10, &val); 448 DRM_DEBUG_KMS("VR10: 0x%04x\n", val); 449 ivch_read(dvo, VR30, &val); 450 DRM_DEBUG_KMS("VR30: 0x%04x\n", val); 451 ivch_read(dvo, VR40, &val); 452 DRM_DEBUG_KMS("VR40: 0x%04x\n", val); 453 454 /* GPIO registers */ 455 ivch_read(dvo, VR80, &val); 456 DRM_DEBUG_KMS("VR80: 0x%04x\n", val); 457 ivch_read(dvo, VR81, &val); 458 DRM_DEBUG_KMS("VR81: 0x%04x\n", val); 459 ivch_read(dvo, VR82, &val); 460 DRM_DEBUG_KMS("VR82: 0x%04x\n", val); 461 ivch_read(dvo, VR83, &val); 462 DRM_DEBUG_KMS("VR83: 0x%04x\n", val); 463 ivch_read(dvo, VR84, &val); 464 DRM_DEBUG_KMS("VR84: 0x%04x\n", val); 465 ivch_read(dvo, VR85, &val); 466 DRM_DEBUG_KMS("VR85: 0x%04x\n", val); 467 ivch_read(dvo, VR86, &val); 468 DRM_DEBUG_KMS("VR86: 0x%04x\n", val); 469 ivch_read(dvo, VR87, &val); 470 DRM_DEBUG_KMS("VR87: 0x%04x\n", val); 471 ivch_read(dvo, VR88, &val); 472 DRM_DEBUG_KMS("VR88: 0x%04x\n", val); 473 474 /* Scratch register 0 - AIM Panel type */ 475 ivch_read(dvo, VR8E, &val); 476 DRM_DEBUG_KMS("VR8E: 0x%04x\n", val); 477 478 /* Scratch register 1 - Status register */ 479 ivch_read(dvo, VR8F, &val); 480 DRM_DEBUG_KMS("VR8F: 0x%04x\n", val); 481 } 482 483 static void ivch_destroy(struct intel_dvo_device *dvo) 484 { 485 struct ivch_priv *priv = dvo->dev_priv; 486 487 if (priv) { 488 kfree(priv); 489 dvo->dev_priv = NULL; 490 } 491 } 492 493 const struct intel_dvo_dev_ops ivch_ops = { 494 .init = ivch_init, 495 .dpms = ivch_dpms, 496 .get_hw_state = ivch_get_hw_state, 497 .mode_valid = ivch_mode_valid, 498 .mode_set = ivch_mode_set, 499 .detect = ivch_detect, 500 .dump_regs = ivch_dump_regs, 501 .destroy = ivch_destroy, 502 }; 503