drivers/gpu/drm/i915/intel_panel.c

   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 "intel_drv.h"
  32
  33 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  34
  35 void
  36 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  37                        struct drm_display_mode *adjusted_mode)
  38 {
  39         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  40         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  41         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  42         adjusted_mode->htotal = fixed_mode->htotal;
  43
  44         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  45         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  46         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  47         adjusted_mode->vtotal = fixed_mode->vtotal;
  48
  49         adjusted_mode->clock = fixed_mode->clock;
  50
  51         drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
  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                         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_i915_private *dev_priv)
 133 {
 134         u32 val;
 135
 136         /* Restore the CTL value if it lost, e.g. GPU reset */
 137
 138         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 139                 val = I915_READ(BLC_PWM_PCH_CTL2);
 140                 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
 141                         dev_priv->saveBLC_PWM_CTL2 = val;
 142                 } else if (val == 0) {
 143                         I915_WRITE(BLC_PWM_PCH_CTL2,
 144                                    dev_priv->saveBLC_PWM_CTL);
 145                         val = dev_priv->saveBLC_PWM_CTL;
 146                 }
 147         } else {
 148                 val = I915_READ(BLC_PWM_CTL);
 149                 if (dev_priv->saveBLC_PWM_CTL == 0) {
 150                         dev_priv->saveBLC_PWM_CTL = val;
 151                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 152                 } else if (val == 0) {
 153                         I915_WRITE(BLC_PWM_CTL,
 154                                    dev_priv->saveBLC_PWM_CTL);
 155                         I915_WRITE(BLC_PWM_CTL2,
 156                                    dev_priv->saveBLC_PWM_CTL2);
 157                         val = dev_priv->saveBLC_PWM_CTL;
 158                 }
 159         }
 160
 161         return val;
 162 }
 163
 164 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 165 {
 166         struct drm_i915_private *dev_priv = dev->dev_private;
 167         u32 max;
 168
 169         max = i915_read_blc_pwm_ctl(dev_priv);
 170         if (max == 0) {
 171                 /* XXX add code here to query mode clock or hardware clock
 172                  * and program max PWM appropriately.
 173                  */
 174                 printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
 175                 return 1;
 176         }
 177
 178         if (HAS_PCH_SPLIT(dev)) {
 179                 max >>= 16;
 180         } else {
 181                 if (INTEL_INFO(dev)->gen < 4)
 182                         max >>= 17;
 183                 else
 184                         max >>= 16;
 185
 186                 if (is_backlight_combination_mode(dev))
 187                         max *= 0xff;
 188         }
 189
 190         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 191         return max;
 192 }
 193
 194 u32 intel_panel_get_backlight(struct drm_device *dev)
 195 {
 196         struct drm_i915_private *dev_priv = dev->dev_private;
 197         u32 val;
 198
 199         if (HAS_PCH_SPLIT(dev)) {
 200                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 201         } else {
 202                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 203                 if (INTEL_INFO(dev)->gen < 4)
 204                         val >>= 1;
 205
 206                 if (is_backlight_combination_mode(dev)) {
 207                         u8 lbpc;
 208
 209                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 210                         val *= lbpc;
 211                 }
 212         }
 213
 214         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 215         return val;
 216 }
 217
 218 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 219 {
 220         struct drm_i915_private *dev_priv = dev->dev_private;
 221         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 222         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 223 }
 224
 225 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 226 {
 227         struct drm_i915_private *dev_priv = dev->dev_private;
 228         u32 tmp;
 229
 230         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 231
 232         if (HAS_PCH_SPLIT(dev))
 233                 return intel_pch_panel_set_backlight(dev, level);
 234
 235         if (is_backlight_combination_mode(dev)) {
 236                 u32 max = intel_panel_get_max_backlight(dev);
 237                 u8 lbpc;
 238
 239                 lbpc = level * 0xfe / max + 1;
 240                 level /= lbpc;
 241                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 242         }
 243
 244         tmp = I915_READ(BLC_PWM_CTL);
 245         if (INTEL_INFO(dev)->gen < 4)
 246                 level <<= 1;
 247         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 248         I915_WRITE(BLC_PWM_CTL, tmp | level);
 249 }
 250
 251 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 252 {
 253         struct drm_i915_private *dev_priv = dev->dev_private;
 254
 255         dev_priv->backlight_level = level;
 256         if (dev_priv->backlight_enabled)
 257                 intel_panel_actually_set_backlight(dev, level);
 258 }
 259
 260 void intel_panel_disable_backlight(struct drm_device *dev)
 261 {
 262         struct drm_i915_private *dev_priv = dev->dev_private;
 263
 264         dev_priv->backlight_enabled = false;
 265         intel_panel_actually_set_backlight(dev, 0);
 266 }
 267
 268 void intel_panel_enable_backlight(struct drm_device *dev)
 269 {
 270         struct drm_i915_private *dev_priv = dev->dev_private;
 271
 272         if (dev_priv->backlight_level == 0)
 273                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 274
 275         dev_priv->backlight_enabled = true;
 276         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 277 }
 278
 279 static void intel_panel_init_backlight(struct drm_device *dev)
 280 {
 281         struct drm_i915_private *dev_priv = dev->dev_private;
 282
 283         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 284         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 285 }
 286
 287 enum drm_connector_status
 288 intel_panel_detect(struct drm_device *dev)
 289 {
 290 #if 0
 291         struct drm_i915_private *dev_priv = dev->dev_private;
 292 #endif
 293
 294         if (i915_panel_ignore_lid)
 295                 return i915_panel_ignore_lid > 0 ?
 296                         connector_status_connected :
 297                         connector_status_disconnected;
 298
 299         /* opregion lid state on HP 2540p is wrong at boot up,
 300          * appears to be either the BIOS or Linux ACPI fault */
 301 #if 0
 302         /* Assume that the BIOS does not lie through the OpRegion... */
 303         if (dev_priv->opregion.lid_state)
 304                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 305                         connector_status_connected :
 306                         connector_status_disconnected;
 307 #endif
 308
 309         return connector_status_unknown;
 310 }
 311
 312 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 313 static int intel_panel_update_status(struct backlight_device *bd)
 314 {
 315         struct drm_device *dev = bl_get_data(bd);
 316         intel_panel_set_backlight(dev, bd->props.brightness);
 317         return 0;
 318 }
 319
 320 static int intel_panel_get_brightness(struct backlight_device *bd)
 321 {
 322         struct drm_device *dev = bl_get_data(bd);
 323         struct drm_i915_private *dev_priv = dev->dev_private;
 324         return dev_priv->backlight_level;
 325 }
 326
 327 static const struct backlight_ops intel_panel_bl_ops = {
 328         .update_status = intel_panel_update_status,
 329         .get_brightness = intel_panel_get_brightness,
 330 };
 331
 332 int intel_panel_setup_backlight(struct drm_device *dev)
 333 {
 334         struct drm_i915_private *dev_priv = dev->dev_private;
 335         struct backlight_properties props;
 336         struct drm_connector *connector;
 337
 338         intel_panel_init_backlight(dev);
 339
 340         if (dev_priv->int_lvds_connector)
 341                 connector = dev_priv->int_lvds_connector;
 342         else if (dev_priv->int_edp_connector)
 343                 connector = dev_priv->int_edp_connector;
 344         else
 345                 return -ENODEV;
 346
 347         props.type = BACKLIGHT_RAW;
 348         props.max_brightness = intel_panel_get_max_backlight(dev);
 349         dev_priv->backlight =
 350                 backlight_device_register("intel_backlight",
 351                                           &connector->kdev, dev,
 352                                           &intel_panel_bl_ops, &props);
 353
 354         if (IS_ERR(dev_priv->backlight)) {
 355                 DRM_ERROR("Failed to register backlight: %ld\n",
 356                           PTR_ERR(dev_priv->backlight));
 357                 dev_priv->backlight = NULL;
 358                 return -ENODEV;
 359         }
 360         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 361         return 0;
 362 }
 363
 364 void intel_panel_destroy_backlight(struct drm_device *dev)
 365 {
 366         struct drm_i915_private *dev_priv = dev->dev_private;
 367         if (dev_priv->backlight)
 368                 backlight_device_unregister(dev_priv->backlight);
 369 }
 370 #else
 371 int intel_panel_setup_backlight(struct drm_device *dev)
 372 {
 373         intel_panel_init_backlight(dev);
 374         return 0;
 375 }
 376
 377 void intel_panel_destroy_backlight(struct drm_device *dev)
 378 {
 379         return;
 380 }
 381 #endif