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 <sys/cdefs.h> 32__FBSDID("$FreeBSD: releng/11.0/sys/dev/drm2/i915/intel_panel.c 296548 2016-03-08 20:33:02Z dumbbell $"); 33 34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 35 36#include <dev/drm2/drmP.h> 37#include <dev/drm2/i915/intel_drv.h> 38 39#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ 40 41void 42intel_fixed_panel_mode(struct drm_display_mode *fixed_mode, 43 struct drm_display_mode *adjusted_mode) 44{ 45 adjusted_mode->hdisplay = fixed_mode->hdisplay; 46 adjusted_mode->hsync_start = fixed_mode->hsync_start; 47 adjusted_mode->hsync_end = fixed_mode->hsync_end; 48 adjusted_mode->htotal = fixed_mode->htotal; 49 50 adjusted_mode->vdisplay = fixed_mode->vdisplay; 51 adjusted_mode->vsync_start = fixed_mode->vsync_start; 52 adjusted_mode->vsync_end = fixed_mode->vsync_end; 53 adjusted_mode->vtotal = fixed_mode->vtotal; 54 55 adjusted_mode->clock = fixed_mode->clock; 56} 57 58/* adjusted_mode has been preset to be the panel's fixed mode */ 59void 60intel_pch_panel_fitting(struct drm_device *dev, 61 int fitting_mode, 62 const struct drm_display_mode *mode, 63 struct drm_display_mode *adjusted_mode) 64{ 65 struct drm_i915_private *dev_priv = dev->dev_private; 66 int x, y, width, height; 67 68 x = y = width = height = 0; 69 70 /* Native modes don't need fitting */ 71 if (adjusted_mode->hdisplay == mode->hdisplay && 72 adjusted_mode->vdisplay == mode->vdisplay) 73 goto done; 74 75 switch (fitting_mode) { 76 case DRM_MODE_SCALE_CENTER: 77 width = mode->hdisplay; 78 height = mode->vdisplay; 79 x = (adjusted_mode->hdisplay - width + 1)/2; 80 y = (adjusted_mode->vdisplay - height + 1)/2; 81 break; 82 83 case DRM_MODE_SCALE_ASPECT: 84 /* Scale but preserve the aspect ratio */ 85 { 86 u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay; 87 u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay; 88 if (scaled_width > scaled_height) { /* pillar */ 89 width = scaled_height / mode->vdisplay; 90 if (width & 1) 91 width++; 92 x = (adjusted_mode->hdisplay - width + 1) / 2; 93 y = 0; 94 height = adjusted_mode->vdisplay; 95 } else if (scaled_width < scaled_height) { /* letter */ 96 height = scaled_width / mode->hdisplay; 97 if (height & 1) 98 height++; 99 y = (adjusted_mode->vdisplay - height + 1) / 2; 100 x = 0; 101 width = adjusted_mode->hdisplay; 102 } else { 103 x = y = 0; 104 width = adjusted_mode->hdisplay; 105 height = adjusted_mode->vdisplay; 106 } 107 } 108 break; 109 110 default: 111 case DRM_MODE_SCALE_FULLSCREEN: 112 x = y = 0; 113 width = adjusted_mode->hdisplay; 114 height = adjusted_mode->vdisplay; 115 break; 116 } 117 118done: 119 dev_priv->pch_pf_pos = (x << 16) | y; 120 dev_priv->pch_pf_size = (width << 16) | height; 121} 122 123static int is_backlight_combination_mode(struct drm_device *dev) 124{ 125 struct drm_i915_private *dev_priv = dev->dev_private; 126 127 if (INTEL_INFO(dev)->gen >= 4) 128 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE; 129 130 if (IS_GEN2(dev)) 131 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE; 132 133 return 0; 134} 135 136static u32 i915_read_blc_pwm_ctl(struct drm_device *dev) 137{ 138 struct drm_i915_private *dev_priv = dev->dev_private; 139 u32 val; 140 141 /* Restore the CTL value if it lost, e.g. GPU reset */ 142 143 if (HAS_PCH_SPLIT(dev_priv->dev)) { 144 val = I915_READ(BLC_PWM_PCH_CTL2); 145 if (dev_priv->regfile.saveBLC_PWM_CTL2 == 0) { 146 dev_priv->regfile.saveBLC_PWM_CTL2 = val; 147 } else if (val == 0) { 148 val = dev_priv->regfile.saveBLC_PWM_CTL2; 149 I915_WRITE(BLC_PWM_PCH_CTL2, val); 150 } 151 } else { 152 val = I915_READ(BLC_PWM_CTL); 153 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) { 154 dev_priv->regfile.saveBLC_PWM_CTL = val; 155 if (INTEL_INFO(dev)->gen >= 4) 156 dev_priv->regfile.saveBLC_PWM_CTL2 = 157 I915_READ(BLC_PWM_CTL2); 158 } else if (val == 0) { 159 val = dev_priv->regfile.saveBLC_PWM_CTL; 160 I915_WRITE(BLC_PWM_CTL, val); 161 if (INTEL_INFO(dev)->gen >= 4) 162 I915_WRITE(BLC_PWM_CTL2, 163 dev_priv->regfile.saveBLC_PWM_CTL2); 164 } 165 } 166 167 return val; 168} 169 170static u32 _intel_panel_get_max_backlight(struct drm_device *dev) 171{ 172 u32 max; 173 174 max = i915_read_blc_pwm_ctl(dev); 175 176 if (HAS_PCH_SPLIT(dev)) { 177 max >>= 16; 178 } else { 179 if (INTEL_INFO(dev)->gen < 4) 180 max >>= 17; 181 else 182 max >>= 16; 183 184 if (is_backlight_combination_mode(dev)) 185 max *= 0xff; 186 } 187 188 return max; 189} 190 191u32 intel_panel_get_max_backlight(struct drm_device *dev) 192{ 193 u32 max; 194 195 max = _intel_panel_get_max_backlight(dev); 196 if (max == 0) { 197 /* XXX add code here to query mode clock or hardware clock 198 * and program max PWM appropriately. 199 */ 200 pr_warn_once("fixme: max PWM is zero\n"); 201 return 1; 202 } 203 204 DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max); 205 return max; 206} 207 208static int i915_panel_invert_brightness; 209TUNABLE_INT("drm.i915.invert_brightness", &i915_panel_invert_brightness); 210MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness " 211 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 212 "report PCI device ID, subsystem vendor and subsystem device ID " 213 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 214 "It will then be included in an upcoming module version."); 215module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600); 216static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val) 217{ 218 struct drm_i915_private *dev_priv = dev->dev_private; 219 220 if (i915_panel_invert_brightness < 0) 221 return val; 222 223 if (i915_panel_invert_brightness > 0 || 224 dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) 225 return intel_panel_get_max_backlight(dev) - val; 226 227 return val; 228} 229 230static u32 intel_panel_get_backlight(struct drm_device *dev) 231{ 232 struct drm_i915_private *dev_priv = dev->dev_private; 233 u32 val; 234 235 if (HAS_PCH_SPLIT(dev)) { 236 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 237 } else { 238 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; 239 if (INTEL_INFO(dev)->gen < 4) 240 val >>= 1; 241 242 if (is_backlight_combination_mode(dev)) { 243 u8 lbpc; 244 245 pci_read_config_byte(dev->dev, PCI_LBPC, &lbpc); 246 val *= lbpc; 247 } 248 } 249 250 val = intel_panel_compute_brightness(dev, val); 251 DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); 252 return val; 253} 254 255static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level) 256{ 257 struct drm_i915_private *dev_priv = dev->dev_private; 258 u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; 259 I915_WRITE(BLC_PWM_CPU_CTL, val | level); 260} 261 262static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level) 263{ 264 struct drm_i915_private *dev_priv = dev->dev_private; 265 u32 tmp; 266 267 DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); 268 level = intel_panel_compute_brightness(dev, level); 269 270 if (HAS_PCH_SPLIT(dev)) 271 return intel_pch_panel_set_backlight(dev, level); 272 273 if (is_backlight_combination_mode(dev)) { 274 u32 max = intel_panel_get_max_backlight(dev); 275 u8 lbpc; 276 277 lbpc = level * 0xfe / max + 1; 278 level /= lbpc; 279 pci_write_config_byte(dev->dev, PCI_LBPC, lbpc); 280 } 281 282 tmp = I915_READ(BLC_PWM_CTL); 283 if (INTEL_INFO(dev)->gen < 4) 284 level <<= 1; 285 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK; 286 I915_WRITE(BLC_PWM_CTL, tmp | level); 287} 288 289void intel_panel_set_backlight(struct drm_device *dev, u32 level) 290{ 291 struct drm_i915_private *dev_priv = dev->dev_private; 292 293 dev_priv->backlight_level = level; 294 if (dev_priv->backlight_enabled) 295 intel_panel_actually_set_backlight(dev, level); 296} 297 298void intel_panel_disable_backlight(struct drm_device *dev) 299{ 300 struct drm_i915_private *dev_priv = dev->dev_private; 301 302 dev_priv->backlight_enabled = false; 303 intel_panel_actually_set_backlight(dev, 0); 304 305 if (INTEL_INFO(dev)->gen >= 4) { 306 uint32_t reg, tmp; 307 308 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 309 310 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); 311 312 if (HAS_PCH_SPLIT(dev)) { 313 tmp = I915_READ(BLC_PWM_PCH_CTL1); 314 tmp &= ~BLM_PCH_PWM_ENABLE; 315 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 316 } 317 } 318} 319 320void intel_panel_enable_backlight(struct drm_device *dev, 321 enum pipe pipe) 322{ 323 struct drm_i915_private *dev_priv = dev->dev_private; 324 325 if (dev_priv->backlight_level == 0) 326 dev_priv->backlight_level = intel_panel_get_max_backlight(dev); 327 328 if (INTEL_INFO(dev)->gen >= 4) { 329 uint32_t reg, tmp; 330 331 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; 332 333 334 tmp = I915_READ(reg); 335 336 /* Note that this can also get called through dpms changes. And 337 * we don't track the backlight dpms state, hence check whether 338 * we have to do anything first. */ 339 if (tmp & BLM_PWM_ENABLE) 340 goto set_level; 341 342 if (dev_priv->num_pipe == 3) 343 tmp &= ~BLM_PIPE_SELECT_IVB; 344 else 345 tmp &= ~BLM_PIPE_SELECT; 346 347 tmp |= BLM_PIPE(pipe); 348 tmp &= ~BLM_PWM_ENABLE; 349 350 I915_WRITE(reg, tmp); 351 POSTING_READ(reg); 352 I915_WRITE(reg, tmp | BLM_PWM_ENABLE); 353 354 if (HAS_PCH_SPLIT(dev)) { 355 tmp = I915_READ(BLC_PWM_PCH_CTL1); 356 tmp |= BLM_PCH_PWM_ENABLE; 357 tmp &= ~BLM_PCH_OVERRIDE_ENABLE; 358 I915_WRITE(BLC_PWM_PCH_CTL1, tmp); 359 } 360 } 361 362set_level: 363 /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1. 364 * BLC_PWM_CPU_CTL may be cleared to zero automatically when these 365 * registers are set. 366 */ 367 dev_priv->backlight_enabled = true; 368 intel_panel_actually_set_backlight(dev, dev_priv->backlight_level); 369} 370 371static void intel_panel_init_backlight(struct drm_device *dev) 372{ 373 struct drm_i915_private *dev_priv = dev->dev_private; 374 375 dev_priv->backlight_level = intel_panel_get_backlight(dev); 376 dev_priv->backlight_enabled = dev_priv->backlight_level != 0; 377} 378 379enum drm_connector_status 380intel_panel_detect(struct drm_device *dev) 381{ 382 struct drm_i915_private *dev_priv = dev->dev_private; 383 384 /* Assume that the BIOS does not lie through the OpRegion... */ 385 if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) { 386 return ioread32(dev_priv->opregion.lid_state) & 0x1 ? 387 connector_status_connected : 388 connector_status_disconnected; 389 } 390 391 switch (i915_panel_ignore_lid) { 392 case -2: 393 return connector_status_connected; 394 case -1: 395 return connector_status_disconnected; 396 default: 397 return connector_status_unknown; 398 } 399} 400 401#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 402static int intel_panel_update_status(struct backlight_device *bd) 403{ 404 struct drm_device *dev = bl_get_data(bd); 405 intel_panel_set_backlight(dev, bd->props.brightness); 406 return 0; 407} 408 409static int intel_panel_get_brightness(struct backlight_device *bd) 410{ 411 struct drm_device *dev = bl_get_data(bd); 412 struct drm_i915_private *dev_priv = dev->dev_private; 413 return dev_priv->backlight_level; 414} 415 416static const struct backlight_ops intel_panel_bl_ops = { 417 .update_status = intel_panel_update_status, 418 .get_brightness = intel_panel_get_brightness, 419}; 420 421int intel_panel_setup_backlight(struct drm_connector *connector) 422{ 423 struct drm_device *dev = connector->dev; 424 struct drm_i915_private *dev_priv = dev->dev_private; 425 struct backlight_properties props; 426 427 intel_panel_init_backlight(dev); 428 429 if (WARN_ON(dev_priv->backlight)) 430 return -ENODEV; 431 432 memset(&props, 0, sizeof(props)); 433 props.type = BACKLIGHT_RAW; 434 props.max_brightness = _intel_panel_get_max_backlight(dev); 435 if (props.max_brightness == 0) { 436 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n"); 437 return -ENODEV; 438 } 439 dev_priv->backlight = 440 backlight_device_register("intel_backlight", 441 &connector->kdev, dev, 442 &intel_panel_bl_ops, &props); 443 444 if (IS_ERR(dev_priv->backlight)) { 445 DRM_ERROR("Failed to register backlight: %ld\n", 446 PTR_ERR(dev_priv->backlight)); 447 dev_priv->backlight = NULL; 448 return -ENODEV; 449 } 450 dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev); 451 return 0; 452} 453 454void intel_panel_destroy_backlight(struct drm_device *dev) 455{ 456 struct drm_i915_private *dev_priv = dev->dev_private; 457 if (dev_priv->backlight) { 458 backlight_device_unregister(dev_priv->backlight); 459 dev_priv->backlight = NULL; 460 } 461} 462#else 463int intel_panel_setup_backlight(struct drm_connector *connector) 464{ 465 intel_panel_init_backlight(connector->dev); 466 return 0; 467} 468 469void intel_panel_destroy_backlight(struct drm_device *dev) 470{ 471 return; 472} 473#endif 474 475int intel_panel_init(struct intel_panel *panel, 476 struct drm_display_mode *fixed_mode) 477{ 478 panel->fixed_mode = fixed_mode; 479 480 return 0; 481} 482 483void intel_panel_fini(struct intel_panel *panel) 484{ 485 struct intel_connector *intel_connector = 486 container_of(panel, struct intel_connector, panel); 487 488 if (panel->fixed_mode) 489 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode); 490} 491