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 "intel_display_types.h" 33 #include "intel_dvo_dev.h" 34 35 /* 36 * register definitions for the i82807aa. 37 * 38 * Documentation on this chipset can be found in datasheet #29069001 at 39 * intel.com. 40 */ 41 42 /* 43 * VCH Revision & GMBus Base Addr 44 */ 45 #define VR00 0x00 46 # define VR00_BASE_ADDRESS_MASK 0x007f 47 48 /* 49 * Functionality Enable 50 */ 51 #define VR01 0x01 52 53 /* 54 * Enable the panel fitter 55 */ 56 # define VR01_PANEL_FIT_ENABLE (1 << 3) 57 /* 58 * Enables the LCD display. 59 * 60 * This must not be set while VR01_DVO_BYPASS_ENABLE is set. 61 */ 62 # define VR01_LCD_ENABLE (1 << 2) 63 /* Enables the DVO repeater. */ 64 # define VR01_DVO_BYPASS_ENABLE (1 << 1) 65 /* Enables the DVO clock */ 66 # define VR01_DVO_ENABLE (1 << 0) 67 /* Enable dithering for 18bpp panels. Not documented. */ 68 # define VR01_DITHER_ENABLE (1 << 4) 69 70 /* 71 * LCD Interface Format 72 */ 73 #define VR10 0x10 74 /* Enables LVDS output instead of CMOS */ 75 # define VR10_LVDS_ENABLE (1 << 4) 76 /* Enables 18-bit LVDS output. */ 77 # define VR10_INTERFACE_1X18 (0 << 2) 78 /* Enables 24-bit LVDS or CMOS output */ 79 # define VR10_INTERFACE_1X24 (1 << 2) 80 /* Enables 2x18-bit LVDS or CMOS output. */ 81 # define VR10_INTERFACE_2X18 (2 << 2) 82 /* Enables 2x24-bit LVDS output */ 83 # define VR10_INTERFACE_2X24 (3 << 2) 84 /* Mask that defines the depth of the pipeline */ 85 # define VR10_INTERFACE_DEPTH_MASK (3 << 2) 86 87 /* 88 * VR20 LCD Horizontal Display Size 89 */ 90 #define VR20 0x20 91 92 /* 93 * LCD Vertical Display Size 94 */ 95 #define VR21 0x21 96 97 /* 98 * Panel power down status 99 */ 100 #define VR30 0x30 101 /* Read only bit indicating that the panel is not in a safe poweroff state. */ 102 # define VR30_PANEL_ON (1 << 15) 103 104 #define VR40 0x40 105 # define VR40_STALL_ENABLE (1 << 13) 106 # define VR40_VERTICAL_INTERP_ENABLE (1 << 12) 107 # define VR40_ENHANCED_PANEL_FITTING (1 << 11) 108 # define VR40_HORIZONTAL_INTERP_ENABLE (1 << 10) 109 # define VR40_AUTO_RATIO_ENABLE (1 << 9) 110 # define VR40_CLOCK_GATING_ENABLE (1 << 8) 111 112 /* 113 * Panel Fitting Vertical Ratio 114 * (((image_height - 1) << 16) / ((panel_height - 1))) >> 2 115 */ 116 #define VR41 0x41 117 118 /* 119 * Panel Fitting Horizontal Ratio 120 * (((image_width - 1) << 16) / ((panel_width - 1))) >> 2 121 */ 122 #define VR42 0x42 123 124 /* 125 * Horizontal Image Size 126 */ 127 #define VR43 0x43 128 129 /* VR80 GPIO 0 130 */ 131 #define VR80 0x80 132 #define VR81 0x81 133 #define VR82 0x82 134 #define VR83 0x83 135 #define VR84 0x84 136 #define VR85 0x85 137 #define VR86 0x86 138 #define VR87 0x87 139 140 /* VR88 GPIO 8 141 */ 142 #define VR88 0x88 143 144 /* Graphics BIOS scratch 0 145 */ 146 #define VR8E 0x8E 147 # define VR8E_PANEL_TYPE_MASK (0xf << 0) 148 # define VR8E_PANEL_INTERFACE_CMOS (0 << 4) 149 # define VR8E_PANEL_INTERFACE_LVDS (1 << 4) 150 # define VR8E_FORCE_DEFAULT_PANEL (1 << 5) 151 152 /* Graphics BIOS scratch 1 153 */ 154 #define VR8F 0x8F 155 # define VR8F_VCH_PRESENT (1 << 0) 156 # define VR8F_DISPLAY_CONN (1 << 1) 157 # define VR8F_POWER_MASK (0x3c) 158 # define VR8F_POWER_POS (2) 159 160 /* Some Bios implementations do not restore the DVO state upon 161 * resume from standby. Thus, this driver has to handle it 162 * instead. The following list contains all registers that 163 * require saving. 164 */ 165 static const u16 backup_addresses[] = { 166 0x11, 0x12, 167 0x18, 0x19, 0x1a, 0x1f, 168 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 169 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 170 0x8e, 0x8f, 171 0x10 /* this must come last */ 172 }; 173 174 175 struct ivch_priv { 176 bool quiet; 177 178 u16 width, height; 179 180 /* Register backup */ 181 182 u16 reg_backup[ARRAY_SIZE(backup_addresses)]; 183 }; 184 185 186 static void ivch_dump_regs(struct intel_dvo_device *dvo); 187 /* 188 * Reads a register on the ivch. 189 * 190 * Each of the 256 registers are 16 bits long. 191 */ 192 static bool ivch_read(struct intel_dvo_device *dvo, int addr, u16 *data) 193 { 194 struct ivch_priv *priv = dvo->dev_priv; 195 struct i2c_adapter *adapter = dvo->i2c_bus; 196 u8 out_buf[1]; 197 u8 in_buf[2]; 198 199 struct i2c_msg msgs[] = { 200 { 201 .addr = dvo->slave_addr, 202 .flags = I2C_M_RD, 203 .len = 0, 204 }, 205 { 206 .addr = 0, 207 .flags = I2C_M_NOSTART, 208 .len = 1, 209 .buf = out_buf, 210 }, 211 { 212 .addr = dvo->slave_addr, 213 .flags = I2C_M_RD | I2C_M_NOSTART, 214 .len = 2, 215 .buf = in_buf, 216 } 217 }; 218 219 out_buf[0] = addr; 220 221 if (i2c_transfer(adapter, msgs, 3) == 3) { 222 *data = (in_buf[1] << 8) | in_buf[0]; 223 return true; 224 } 225 226 if (!priv->quiet) { 227 DRM_DEBUG_KMS("Unable to read register 0x%02x from " 228 "%s:%02x.\n", 229 addr, adapter->name, dvo->slave_addr); 230 } 231 return false; 232 } 233 234 /* Writes a 16-bit register on the ivch */ 235 static bool ivch_write(struct intel_dvo_device *dvo, int addr, u16 data) 236 { 237 struct ivch_priv *priv = dvo->dev_priv; 238 struct i2c_adapter *adapter = dvo->i2c_bus; 239 u8 out_buf[3]; 240 struct i2c_msg msg = { 241 .addr = dvo->slave_addr, 242 .flags = 0, 243 .len = 3, 244 .buf = out_buf, 245 }; 246 247 out_buf[0] = addr; 248 out_buf[1] = data & 0xff; 249 out_buf[2] = data >> 8; 250 251 if (i2c_transfer(adapter, &msg, 1) == 1) 252 return true; 253 254 if (!priv->quiet) { 255 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n", 256 addr, adapter->name, dvo->slave_addr); 257 } 258 259 return false; 260 } 261 262 /* Probes the given bus and slave address for an ivch */ 263 static bool ivch_init(struct intel_dvo_device *dvo, 264 struct i2c_adapter *adapter) 265 { 266 struct ivch_priv *priv; 267 u16 temp; 268 int i; 269 270 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 271 if (priv == NULL) 272 return false; 273 274 dvo->i2c_bus = adapter; 275 dvo->dev_priv = priv; 276 priv->quiet = true; 277 278 if (!ivch_read(dvo, VR00, &temp)) 279 goto out; 280 priv->quiet = false; 281 282 /* Since the identification bits are probably zeroes, which doesn't seem 283 * very unique, check that the value in the base address field matches 284 * the address it's responding on. 285 */ 286 if ((temp & VR00_BASE_ADDRESS_MASK) != dvo->slave_addr) { 287 DRM_DEBUG_KMS("ivch detect failed due to address mismatch " 288 "(%d vs %d)\n", 289 (temp & VR00_BASE_ADDRESS_MASK), dvo->slave_addr); 290 goto out; 291 } 292 293 ivch_read(dvo, VR20, &priv->width); 294 ivch_read(dvo, VR21, &priv->height); 295 296 /* Make a backup of the registers to be able to restore them 297 * upon suspend. 298 */ 299 for (i = 0; i < ARRAY_SIZE(backup_addresses); i++) 300 ivch_read(dvo, backup_addresses[i], priv->reg_backup + i); 301 302 ivch_dump_regs(dvo); 303 304 return true; 305 306 out: 307 kfree(priv); 308 return false; 309 } 310 311 static enum drm_connector_status ivch_detect(struct intel_dvo_device *dvo) 312 { 313 return connector_status_connected; 314 } 315 316 static enum drm_mode_status ivch_mode_valid(struct intel_dvo_device *dvo, 317 struct drm_display_mode *mode) 318 { 319 if (mode->clock > 112000) 320 return MODE_CLOCK_HIGH; 321 322 return MODE_OK; 323 } 324 325 /* Restore the DVO registers after a resume 326 * from RAM. Registers have been saved during 327 * the initialization. 328 */ 329 static void ivch_reset(struct intel_dvo_device *dvo) 330 { 331 struct ivch_priv *priv = dvo->dev_priv; 332 int i; 333 334 DRM_DEBUG_KMS("Resetting the IVCH registers\n"); 335 336 ivch_write(dvo, VR10, 0x0000); 337 338 for (i = 0; i < ARRAY_SIZE(backup_addresses); i++) 339 ivch_write(dvo, backup_addresses[i], priv->reg_backup[i]); 340 } 341 342 /* Sets the power state of the panel connected to the ivch */ 343 static void ivch_dpms(struct intel_dvo_device *dvo, bool enable) 344 { 345 int i; 346 u16 vr01, vr30, backlight; 347 348 ivch_reset(dvo); 349 350 /* Set the new power state of the panel. */ 351 if (!ivch_read(dvo, VR01, &vr01)) 352 return; 353 354 if (enable) 355 backlight = 1; 356 else 357 backlight = 0; 358 359 ivch_write(dvo, VR80, backlight); 360 361 if (enable) 362 vr01 |= VR01_LCD_ENABLE | VR01_DVO_ENABLE; 363 else 364 vr01 &= ~(VR01_LCD_ENABLE | VR01_DVO_ENABLE); 365 366 ivch_write(dvo, VR01, vr01); 367 368 /* Wait for the panel to make its state transition */ 369 for (i = 0; i < 100; i++) { 370 if (!ivch_read(dvo, VR30, &vr30)) 371 break; 372 373 if (((vr30 & VR30_PANEL_ON) != 0) == enable) 374 break; 375 udelay(1000); 376 } 377 /* wait some more; vch may fail to resync sometimes without this */ 378 udelay(16 * 1000); 379 } 380 381 static bool ivch_get_hw_state(struct intel_dvo_device *dvo) 382 { 383 u16 vr01; 384 385 ivch_reset(dvo); 386 387 /* Set the new power state of the panel. */ 388 if (!ivch_read(dvo, VR01, &vr01)) 389 return false; 390 391 if (vr01 & VR01_LCD_ENABLE) 392 return true; 393 else 394 return false; 395 } 396 397 static void ivch_mode_set(struct intel_dvo_device *dvo, 398 const struct drm_display_mode *mode, 399 const struct drm_display_mode *adjusted_mode) 400 { 401 struct ivch_priv *priv = dvo->dev_priv; 402 u16 vr40 = 0; 403 u16 vr01 = 0; 404 u16 vr10; 405 406 ivch_reset(dvo); 407 408 vr10 = priv->reg_backup[ARRAY_SIZE(backup_addresses) - 1]; 409 410 /* Enable dithering for 18 bpp pipelines */ 411 vr10 &= VR10_INTERFACE_DEPTH_MASK; 412 if (vr10 == VR10_INTERFACE_2X18 || vr10 == VR10_INTERFACE_1X18) 413 vr01 = VR01_DITHER_ENABLE; 414 415 vr40 = (VR40_STALL_ENABLE | VR40_VERTICAL_INTERP_ENABLE | 416 VR40_HORIZONTAL_INTERP_ENABLE); 417 418 if (mode->hdisplay != adjusted_mode->crtc_hdisplay || 419 mode->vdisplay != adjusted_mode->crtc_vdisplay) { 420 u16 x_ratio, y_ratio; 421 422 vr01 |= VR01_PANEL_FIT_ENABLE; 423 vr40 |= VR40_CLOCK_GATING_ENABLE; 424 x_ratio = (((mode->hdisplay - 1) << 16) / 425 (adjusted_mode->crtc_hdisplay - 1)) >> 2; 426 y_ratio = (((mode->vdisplay - 1) << 16) / 427 (adjusted_mode->crtc_vdisplay - 1)) >> 2; 428 ivch_write(dvo, VR42, x_ratio); 429 ivch_write(dvo, VR41, y_ratio); 430 } else { 431 vr01 &= ~VR01_PANEL_FIT_ENABLE; 432 vr40 &= ~VR40_CLOCK_GATING_ENABLE; 433 } 434 vr40 &= ~VR40_AUTO_RATIO_ENABLE; 435 436 ivch_write(dvo, VR01, vr01); 437 ivch_write(dvo, VR40, vr40); 438 } 439 440 static void ivch_dump_regs(struct intel_dvo_device *dvo) 441 { 442 u16 val; 443 444 ivch_read(dvo, VR00, &val); 445 DRM_DEBUG_KMS("VR00: 0x%04x\n", val); 446 ivch_read(dvo, VR01, &val); 447 DRM_DEBUG_KMS("VR01: 0x%04x\n", val); 448 ivch_read(dvo, VR10, &val); 449 DRM_DEBUG_KMS("VR10: 0x%04x\n", val); 450 ivch_read(dvo, VR30, &val); 451 DRM_DEBUG_KMS("VR30: 0x%04x\n", val); 452 ivch_read(dvo, VR40, &val); 453 DRM_DEBUG_KMS("VR40: 0x%04x\n", val); 454 455 /* GPIO registers */ 456 ivch_read(dvo, VR80, &val); 457 DRM_DEBUG_KMS("VR80: 0x%04x\n", val); 458 ivch_read(dvo, VR81, &val); 459 DRM_DEBUG_KMS("VR81: 0x%04x\n", val); 460 ivch_read(dvo, VR82, &val); 461 DRM_DEBUG_KMS("VR82: 0x%04x\n", val); 462 ivch_read(dvo, VR83, &val); 463 DRM_DEBUG_KMS("VR83: 0x%04x\n", val); 464 ivch_read(dvo, VR84, &val); 465 DRM_DEBUG_KMS("VR84: 0x%04x\n", val); 466 ivch_read(dvo, VR85, &val); 467 DRM_DEBUG_KMS("VR85: 0x%04x\n", val); 468 ivch_read(dvo, VR86, &val); 469 DRM_DEBUG_KMS("VR86: 0x%04x\n", val); 470 ivch_read(dvo, VR87, &val); 471 DRM_DEBUG_KMS("VR87: 0x%04x\n", val); 472 ivch_read(dvo, VR88, &val); 473 DRM_DEBUG_KMS("VR88: 0x%04x\n", val); 474 475 /* Scratch register 0 - AIM Panel type */ 476 ivch_read(dvo, VR8E, &val); 477 DRM_DEBUG_KMS("VR8E: 0x%04x\n", val); 478 479 /* Scratch register 1 - Status register */ 480 ivch_read(dvo, VR8F, &val); 481 DRM_DEBUG_KMS("VR8F: 0x%04x\n", val); 482 } 483 484 static void ivch_destroy(struct intel_dvo_device *dvo) 485 { 486 struct ivch_priv *priv = dvo->dev_priv; 487 488 if (priv) { 489 kfree(priv); 490 dvo->dev_priv = NULL; 491 } 492 } 493 494 const struct intel_dvo_dev_ops ivch_ops = { 495 .init = ivch_init, 496 .dpms = ivch_dpms, 497 .get_hw_state = ivch_get_hw_state, 498 .mode_valid = ivch_mode_valid, 499 .mode_set = ivch_mode_set, 500 .detect = ivch_detect, 501 .dump_regs = ivch_dump_regs, 502 .destroy = ivch_destroy, 503 }; 504