1 /* 2 * Copyright © 2006-2010 Intel Corporation 3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Eric Anholt <eric@anholt.net> 26 * Dave Airlie <airlied@linux.ie> 27 * Jesse Barnes <jesse.barnes@intel.com> 28 * Chris Wilson <chris@chris-wilson.co.uk> 29 */ 30 31 #include <drm/drmP.h> 32 #include <drm/i915_drm.h> 33 #include "intel_drv.h" 34 35 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ 36 37 void 38 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode, 39 struct drm_display_mode *adjusted_mode) 40 { 41 adjusted_mode->hdisplay = fixed_mode->hdisplay; 42 adjusted_mode->hsync_start = fixed_mode->hsync_start; 43 adjusted_mode->hsync_end = fixed_mode->hsync_end; 44 adjusted_mode->htotal = fixed_mode->htotal; 45 46 adjusted_mode->vdisplay = fixed_mode->vdisplay; 47 adjusted_mode->vsync_start = fixed_mode->vsync_start; 48 adjusted_mode->vsync_end = fixed_mode->vsync_end; 49 adjusted_mode->vtotal = fixed_mode->vtotal; 50 51 adjusted_mode->clock = fixed_mode->clock; 52 } 53 54 /* adjusted_mode has been preset to be the panel's fixed mode */ 55 void 56 intel_pch_panel_fitting(struct drm_device *dev, 57 int fitting_mode, 58 const struct drm_display_mode *mode, 59 struct drm_display_mode *adjusted_mode) 60 { 61 struct drm_i915_private *dev_priv = dev->dev_private; 62 int x, y, width, height; 63 64 x = y = width = height = 0; 65 66 /* Native modes don't need fitting */ 67 if (adjusted_mode->hdisplay == mode->hdisplay && 68 adjusted_mode->vdisplay == mode->vdisplay) 69 goto done; 70 71 switch (fitting_mode) { 72 case DRM_MODE_SCALE_CENTER: 73 width = mode->hdisplay; 74 height = mode->vdisplay; 75 x = (adjusted_mode->hdisplay - width + 1)/2; 76 y = (adjusted_mode->vdisplay - height + 1)/2; 77 break; 78 79 case DRM_MODE_SCALE_ASPECT: 80 /* Scale but preserve the aspect ratio */ 81 { 82 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay; 83 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay; 84 if (scaled_width > scaled_height) { /* pillar */ 85 width = scaled_height / mode->vdisplay; 86 if (width & 1) 87 width++; 88 x = (adjusted_mode->hdisplay - width + 1) / 2; 89 y = 0; 90 height = adjusted_mode->vdisplay; 91 } else if (scaled_width < scaled_height) { /* letter */ 92 height = scaled_width / mode->hdisplay; 93 if (height & 1) 94 height++; 95 y = (adjusted_mode->vdisplay - height + 1) / 2; 96 x = 0; 97 width = adjusted_mode->hdisplay; 98 } else { 99 x = y = 0; 100 width = adjusted_mode->hdisplay; 101 height = adjusted_mode->vdisplay; 102 } 103 } 104 break; 105 106 default: 107 case DRM_MODE_SCALE_FULLSCREEN: 108 x = y = 0; 109 width = adjusted_mode->hdisplay; 110 height = adjusted_mode->vdisplay; 111 break; 112 } 113 114 done: 115 dev_priv->pch_pf_pos = (x << 16) | y; 116 dev_priv->pch_pf_size = (width << 16) | height; 117 } 118 119 static int is_backlight_combination_mode(struct drm_device *dev) 120 { 121 struct drm_i915_private *dev_priv = dev->dev_private; 122 123 if (INTEL_INFO(dev)->gen >= 4) 124 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE; 125 126 if (IS_GEN2(dev)) 127 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE; 128 129 return 0; 130 } 131 132 static u32 i915_read_blc_pwm_ctl(struct drm_device *dev) 133 { 134 struct drm_i915_private *dev_priv = dev->dev_private; 135 u32 val; 136 137 /* Restore the CTL value if it lost, e.g. GPU reset */ 138 139 if (HAS_PCH_SPLIT(dev_priv->dev)) { 140 val = I915_READ(BLC_PWM_PCH_CTL2); 141 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) { 142 dev_priv->regfile.saveBLC_PWM_CTL2 = val; 143 } else if (val == 0) { 144 val = dev_priv->regfile.saveBLC_PWM_CTL2; 145 I915_WRITE(BLC_PWM_PCH_CTL2, val); 146 } 147 } else { 148 val = I915_READ(BLC_PWM_CTL); 149 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) { 150 dev_priv->regfile.saveBLC_PWM_CTL = val; 151 if (INTEL_INFO(dev)->gen >= 4) 152 dev_priv->regfile.saveBLC_PWM_CTL2 = 153 I915_READ(BLC_PWM_CTL2); 154 } else if (val == 0) { 155 val = dev_priv->regfile.saveBLC_PWM_CTL; 156 I915_WRITE(BLC_PWM_CTL, val); 157 if (INTEL_INFO(dev)->gen >= 4) 158 I915_WRITE(BLC_PWM_CTL2, 159 dev_priv->regfile.saveBLC_PWM_CTL2); 160 } 161 } 162 163 return val; 164 } 165 166 static u32 _intel_panel_get_max_backlight(struct drm_device *dev) 167 { 168 u32 max; 169 170 max = i915_read_blc_pwm_ctl(dev); 171 172 if (HAS_PCH_SPLIT(dev)) { 173 max >>= 16; 174 } else { 175 if (INTEL_INFO(dev)->gen < 4) 176 max >>= 17; 177 else 178 max >>= 16; 179 180 if (is_backlight_combination_mode(dev)) 181 max *= 0xff; 182 } 183 184 return max; 185 } 186 187 u32 intel_panel_get_max_backlight(struct drm_device *dev) 188 { 189 u32 max; 190 191 max = _intel_panel_get_max_backlight(dev); 192 if (max == 0) { 193 /* XXX add code here to query mode clock or hardware clock 194 * and program max PWM appropriately. 195 */ 196 #if 0 197 pr_warn_once("fixme: max PWM is zero\n"); 198 #endif 199 return 1; 200 } 201 202 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max); 203 return max; 204 } 205 206 static u32 intel_panel_get_backlight(struct drm_device *dev) 207 { 208 struct drm_i915_private *dev_priv = dev->dev_private; 209 u32 val; 210 211 if (HAS_PCH_SPLIT(dev)) { 212 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 213 } else { 214 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 215 if (INTEL_INFO(dev)->gen < 4) 216 val >>= 1; 217 218 if (is_backlight_combination_mode(dev)) { 219 u8 lbpc; 220 221 lbpc = pci_read_config(dev->dev, PCI_LBPC, 1); 222 val *= lbpc; 223 } 224 } 225 226 DRM_DEBUG("get backlight PWM = %d\n", val); 227 return val; 228 } 229 230 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level) 231 { 232 struct drm_i915_private *dev_priv = dev->dev_private; 233 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 234 I915_WRITE(BLC_PWM_CPU_CTL, val | level); 235 } 236 237 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level) 238 { 239 struct drm_i915_private *dev_priv = dev->dev_private; 240 u32 tmp; 241 242 DRM_DEBUG("set backlight PWM = %d\n", level); 243 244 if (HAS_PCH_SPLIT(dev)) 245 return intel_pch_panel_set_backlight(dev, level); 246 247 if (is_backlight_combination_mode(dev)) { 248 u32 max = intel_panel_get_max_backlight(dev); 249 u8 lbpc; 250 251 lbpc = level * 0xfe / max + 1; 252 level /= lbpc; 253 pci_write_config(dev->dev, PCI_LBPC, lbpc, 4); 254 } 255 256 tmp = I915_READ(BLC_PWM_CTL); 257 if (INTEL_INFO(dev)->gen < 4) 258 level <<= 1; 259 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK; 260 I915_WRITE(BLC_PWM_CTL, tmp | level); 261 } 262 263 void intel_panel_set_backlight(struct drm_device *dev, u32 level) 264 { 265 struct drm_i915_private *dev_priv = dev->dev_private; 266 267 dev_priv->backlight_level = level; 268 if (dev_priv->backlight_enabled) 269 intel_panel_actually_set_backlight(dev, level); 270 } 271 272 void intel_panel_disable_backlight(struct drm_device *dev) 273 { 274 struct drm_i915_private *dev_priv = dev->dev_private; 275 276 dev_priv->backlight_enabled = false; 277 intel_panel_actually_set_backlight(dev, 0); 278 279 if (INTEL_INFO(dev)->gen >= 4) { 280 uint32_t reg; 281 282 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 283 284 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); 285 } 286 } 287 288 void intel_panel_enable_backlight(struct drm_device *dev, 289 enum i915_pipe pipe) 290 { 291 struct drm_i915_private *dev_priv = dev->dev_private; 292 293 if (dev_priv->backlight_level == 0) 294 dev_priv->backlight_level = intel_panel_get_max_backlight(dev); 295 296 if (INTEL_INFO(dev)->gen >= 4) { 297 uint32_t reg, tmp; 298 299 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 300 301 302 tmp = I915_READ(reg); 303 304 /* Note that this can also get called through dpms changes. And 305 * we don't track the backlight dpms state, hence check whether 306 * we have to do anything first. */ 307 if (tmp & BLM_PWM_ENABLE) 308 goto set_level; 309 310 if (dev_priv->num_pipe == 3) 311 tmp &= ~BLM_PIPE_SELECT_IVB; 312 else 313 tmp &= ~BLM_PIPE_SELECT; 314 315 tmp |= BLM_PIPE(pipe); 316 tmp &= ~BLM_PWM_ENABLE; 317 318 I915_WRITE(reg, tmp); 319 POSTING_READ(reg); 320 I915_WRITE(reg, tmp | BLM_PWM_ENABLE); 321 322 if (HAS_PCH_SPLIT(dev)) { 323 tmp = I915_READ(BLC_PWM_PCH_CTL1); 324 tmp |= BLM_PCH_PWM_ENABLE; 325 tmp &= ~BLM_PCH_OVERRIDE_ENABLE; 326 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 327 } 328 } 329 330 set_level: 331 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. 332 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these 333 * registers are set. 334 */ 335 dev_priv->backlight_enabled = true; 336 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level); 337 } 338 339 static void intel_panel_init_backlight(struct drm_device *dev) 340 { 341 struct drm_i915_private *dev_priv = dev->dev_private; 342 343 dev_priv->backlight_level = intel_panel_get_backlight(dev); 344 dev_priv->backlight_enabled = dev_priv->backlight_level != 0; 345 } 346 347 enum drm_connector_status 348 intel_panel_detect(struct drm_device *dev) 349 { 350 #if 0 351 struct drm_i915_private *dev_priv = dev->dev_private; 352 #endif 353 354 if (i915_panel_ignore_lid) 355 return i915_panel_ignore_lid > 0 ? 356 connector_status_connected : 357 connector_status_disconnected; 358 359 /* opregion lid state on HP 2540p is wrong at boot up, 360 * appears to be either the BIOS or Linux ACPI fault */ 361 #if 0 362 /* Assume that the BIOS does not lie through the OpRegion... */ 363 if (dev_priv->opregion.lid_state) 364 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 365 connector_status_connected : 366 connector_status_disconnected; 367 #endif 368 369 return connector_status_unknown; 370 } 371 372 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 373 static int intel_panel_update_status(struct backlight_device *bd) 374 { 375 struct drm_device *dev = bl_get_data(bd); 376 intel_panel_set_backlight(dev, bd->props.brightness); 377 return 0; 378 } 379 380 static int intel_panel_get_brightness(struct backlight_device *bd) 381 { 382 struct drm_device *dev = bl_get_data(bd); 383 struct drm_i915_private *dev_priv = dev->dev_private; 384 return dev_priv->backlight_level; 385 } 386 387 static const struct backlight_ops intel_panel_bl_ops = { 388 .update_status = intel_panel_update_status, 389 .get_brightness = intel_panel_get_brightness, 390 }; 391 392 int intel_panel_setup_backlight(struct drm_connector *connector) 393 { 394 struct drm_device *dev = connector->dev; 395 struct drm_i915_private *dev_priv = dev->dev_private; 396 struct backlight_properties props; 397 398 intel_panel_init_backlight(dev); 399 400 if (WARN_ON(dev_priv->backlight)) 401 return -ENODEV; 402 403 memset(&props, 0, sizeof(props)); 404 props.type = BACKLIGHT_RAW; 405 props.max_brightness = _intel_panel_get_max_backlight(dev); 406 if (props.max_brightness == 0) { 407 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); 408 return -ENODEV; 409 } 410 dev_priv->backlight = 411 backlight_device_register("intel_backlight", 412 &connector->kdev, dev, 413 &intel_panel_bl_ops, &props); 414 415 if (IS_ERR(dev_priv->backlight)) { 416 DRM_ERROR("Failed to register backlight: %ld\n", 417 PTR_ERR(dev_priv->backlight)); 418 dev_priv->backlight = NULL; 419 return -ENODEV; 420 } 421 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev); 422 return 0; 423 } 424 425 void intel_panel_destroy_backlight(struct drm_device *dev) 426 { 427 struct drm_i915_private *dev_priv = dev->dev_private; 428 if (dev_priv->backlight) { 429 backlight_device_unregister(dev_priv->backlight); 430 dev_priv->backlight = NULL; 431 } 432 } 433 #else 434 int intel_panel_setup_backlight(struct drm_connector *connector) 435 { 436 intel_panel_init_backlight(connector->dev); 437 return 0; 438 } 439 440 void intel_panel_destroy_backlight(struct drm_device *dev) 441 { 442 return; 443 } 444 #endif 445 446 int intel_panel_init(struct intel_panel *panel, 447 struct drm_display_mode *fixed_mode) 448 { 449 panel->fixed_mode = fixed_mode; 450 451 return 0; 452 } 453 454 void intel_panel_fini(struct intel_panel *panel) 455 { 456 struct intel_connector *intel_connector = 457 container_of(panel, struct intel_connector, panel); 458 459 if (panel->fixed_mode) 460 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 461 } 462