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 <linux/moduleparam.h>
  32 #include "intel_drv.h"
  33
  34 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  35
  36 void
  37 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  38                        struct drm_display_mode *adjusted_mode)
  39 {
  40         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  41         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  42         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  43         adjusted_mode->htotal = fixed_mode->htotal;
  44
  45         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  46         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  47         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  48         adjusted_mode->vtotal = fixed_mode->vtotal;
  49
  50         adjusted_mode->clock = fixed_mode->clock;
  51
  52         drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
  53 }
  54
  55 /* adjusted_mode has been preset to be the panel's fixed mode */
  56 void
  57 intel_pch_panel_fitting(struct drm_device *dev,
  58                         int fitting_mode,
  59                         struct drm_display_mode *mode,
  60                         struct drm_display_mode *adjusted_mode)
  61 {
  62         struct drm_i915_private *dev_priv = dev->dev_private;
  63         int x, y, width, height;
  64
  65         x = y = width = height = 0;
  66
  67         /* Native modes don't need fitting */
  68         if (adjusted_mode->hdisplay == mode->hdisplay &&
  69             adjusted_mode->vdisplay == mode->vdisplay)
  70                 goto done;
  71
  72         switch (fitting_mode) {
  73         case DRM_MODE_SCALE_CENTER:
  74                 width = mode->hdisplay;
  75                 height = mode->vdisplay;
  76                 x = (adjusted_mode->hdisplay - width + 1)/2;
  77                 y = (adjusted_mode->vdisplay - height + 1)/2;
  78                 break;
  79
  80         case DRM_MODE_SCALE_ASPECT:
  81                 /* Scale but preserve the aspect ratio */
  82                 {
  83                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  84                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  85                         if (scaled_width > scaled_height) { /* pillar */
  86                                 width = scaled_height / mode->vdisplay;
  87                                 if (width & 1)
  88                                         width++;
  89                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  90                                 y = 0;
  91                                 height = adjusted_mode->vdisplay;
  92                         } else if (scaled_width < scaled_height) { /* letter */
  93                                 height = scaled_width / mode->hdisplay;
  94                                 if (height & 1)
  95                                     height++;
  96                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  97                                 x = 0;
  98                                 width = adjusted_mode->hdisplay;
  99                         } else {
 100                                 x = y = 0;
 101                                 width = adjusted_mode->hdisplay;
 102                                 height = adjusted_mode->vdisplay;
 103                         }
 104                 }
 105                 break;
 106
 107         default:
 108         case DRM_MODE_SCALE_FULLSCREEN:
 109                 x = y = 0;
 110                 width = adjusted_mode->hdisplay;
 111                 height = adjusted_mode->vdisplay;
 112                 break;
 113         }
 114
 115 done:
 116         dev_priv->pch_pf_pos = (x << 16) | y;
 117         dev_priv->pch_pf_size = (width << 16) | height;
 118 }
 119
 120 static int is_backlight_combination_mode(struct drm_device *dev)
 121 {
 122         struct drm_i915_private *dev_priv = dev->dev_private;
 123
 124         if (INTEL_INFO(dev)->gen >= 4)
 125                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 126
 127         if (IS_GEN2(dev))
 128                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 129
 130         return 0;
 131 }
 132
 133 static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
 134 {
 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->saveBLC_PWM_CTL2 == 0) {
 142                         dev_priv->saveBLC_PWM_CTL2 = val;
 143                 } else if (val == 0) {
 144                         I915_WRITE(BLC_PWM_PCH_CTL2,
 145                                    dev_priv->saveBLC_PWM_CTL);
 146                         val = dev_priv->saveBLC_PWM_CTL;
 147                 }
 148         } else {
 149                 val = I915_READ(BLC_PWM_CTL);
 150                 if (dev_priv->saveBLC_PWM_CTL == 0) {
 151                         dev_priv->saveBLC_PWM_CTL = val;
 152                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 153                 } else if (val == 0) {
 154                         I915_WRITE(BLC_PWM_CTL,
 155                                    dev_priv->saveBLC_PWM_CTL);
 156                         I915_WRITE(BLC_PWM_CTL2,
 157                                    dev_priv->saveBLC_PWM_CTL2);
 158                         val = dev_priv->saveBLC_PWM_CTL;
 159                 }
 160         }
 161
 162         return val;
 163 }
 164
 165 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 166 {
 167         struct drm_i915_private *dev_priv = dev->dev_private;
 168         u32 max;
 169
 170         max = i915_read_blc_pwm_ctl(dev_priv);
 171         if (max == 0) {
 172                 /* XXX add code here to query mode clock or hardware clock
 173                  * and program max PWM appropriately.
 174                  */
 175                 printk_once(KERN_WARNING "fixme: max PWM is zero.\n");
 176                 return 1;
 177         }
 178
 179         if (HAS_PCH_SPLIT(dev)) {
 180                 max >>= 16;
 181         } else {
 182                 if (INTEL_INFO(dev)->gen < 4)
 183                         max >>= 17;
 184                 else
 185                         max >>= 16;
 186
 187                 if (is_backlight_combination_mode(dev))
 188                         max *= 0xff;
 189         }
 190
 191         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 192         return max;
 193 }
 194
 195 static bool i915_panel_invert_brightness;
 196 MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness, please "
 197         "report PCI device ID, subsystem vendor and subsystem device ID "
 198         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 199         "It will then be included in an upcoming module version.");
 200 module_param_named(invert_brightness, i915_panel_invert_brightness, bool, 0600);
 201 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 202 {
 203         if (i915_panel_invert_brightness)
 204                 return intel_panel_get_max_backlight(dev) - val;
 205
 206         return val;
 207 }
 208
 209 u32 intel_panel_get_backlight(struct drm_device *dev)
 210 {
 211         struct drm_i915_private *dev_priv = dev->dev_private;
 212         u32 val;
 213
 214         if (HAS_PCH_SPLIT(dev)) {
 215                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 216         } else {
 217                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 218                 if (INTEL_INFO(dev)->gen < 4)
 219                         val >>= 1;
 220
 221                 if (is_backlight_combination_mode(dev)) {
 222                         u8 lbpc;
 223
 224                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 225                         val *= lbpc;
 226                 }
 227         }
 228
 229         val = intel_panel_compute_brightness(dev, val);
 230         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 231         return val;
 232 }
 233
 234 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 235 {
 236         struct drm_i915_private *dev_priv = dev->dev_private;
 237         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 238         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 239 }
 240
 241 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 242 {
 243         struct drm_i915_private *dev_priv = dev->dev_private;
 244         u32 tmp;
 245
 246         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 247         level = intel_panel_compute_brightness(dev, level);
 248
 249         if (HAS_PCH_SPLIT(dev))
 250                 return intel_pch_panel_set_backlight(dev, level);
 251
 252         if (is_backlight_combination_mode(dev)) {
 253                 u32 max = intel_panel_get_max_backlight(dev);
 254                 u8 lbpc;
 255
 256                 lbpc = level * 0xfe / max + 1;
 257                 level /= lbpc;
 258                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 259         }
 260
 261         tmp = I915_READ(BLC_PWM_CTL);
 262         if (INTEL_INFO(dev)->gen < 4)
 263                 level <<= 1;
 264         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 265         I915_WRITE(BLC_PWM_CTL, tmp | level);
 266 }
 267
 268 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 269 {
 270         struct drm_i915_private *dev_priv = dev->dev_private;
 271
 272         dev_priv->backlight_level = level;
 273         if (dev_priv->backlight_enabled)
 274                 intel_panel_actually_set_backlight(dev, level);
 275 }
 276
 277 void intel_panel_disable_backlight(struct drm_device *dev)
 278 {
 279         struct drm_i915_private *dev_priv = dev->dev_private;
 280
 281         dev_priv->backlight_enabled = false;
 282         intel_panel_actually_set_backlight(dev, 0);
 283 }
 284
 285 void intel_panel_enable_backlight(struct drm_device *dev)
 286 {
 287         struct drm_i915_private *dev_priv = dev->dev_private;
 288
 289         if (dev_priv->backlight_level == 0)
 290                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 291
 292         dev_priv->backlight_enabled = true;
 293         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 294 }
 295
 296 static void intel_panel_init_backlight(struct drm_device *dev)
 297 {
 298         struct drm_i915_private *dev_priv = dev->dev_private;
 299
 300         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 301         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 302 }
 303
 304 enum drm_connector_status
 305 intel_panel_detect(struct drm_device *dev)
 306 {
 307 #if 0
 308         struct drm_i915_private *dev_priv = dev->dev_private;
 309 #endif
 310
 311         if (i915_panel_ignore_lid)
 312                 return i915_panel_ignore_lid > 0 ?
 313                         connector_status_connected :
 314                         connector_status_disconnected;
 315
 316         /* opregion lid state on HP 2540p is wrong at boot up,
 317          * appears to be either the BIOS or Linux ACPI fault */
 318 #if 0
 319         /* Assume that the BIOS does not lie through the OpRegion... */
 320         if (dev_priv->opregion.lid_state)
 321                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 322                         connector_status_connected :
 323                         connector_status_disconnected;
 324 #endif
 325
 326         return connector_status_unknown;
 327 }
 328
 329 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 330 static int intel_panel_update_status(struct backlight_device *bd)
 331 {
 332         struct drm_device *dev = bl_get_data(bd);
 333         intel_panel_set_backlight(dev, bd->props.brightness);
 334         return 0;
 335 }
 336
 337 static int intel_panel_get_brightness(struct backlight_device *bd)
 338 {
 339         struct drm_device *dev = bl_get_data(bd);
 340         struct drm_i915_private *dev_priv = dev->dev_private;
 341         return dev_priv->backlight_level;
 342 }
 343
 344 static const struct backlight_ops intel_panel_bl_ops = {
 345         .update_status = intel_panel_update_status,
 346         .get_brightness = intel_panel_get_brightness,
 347 };
 348
 349 int intel_panel_setup_backlight(struct drm_device *dev)
 350 {
 351         struct drm_i915_private *dev_priv = dev->dev_private;
 352         struct backlight_properties props;
 353         struct drm_connector *connector;
 354
 355         intel_panel_init_backlight(dev);
 356
 357         if (dev_priv->int_lvds_connector)
 358                 connector = dev_priv->int_lvds_connector;
 359         else if (dev_priv->int_edp_connector)
 360                 connector = dev_priv->int_edp_connector;
 361         else
 362                 return -ENODEV;
 363
 364         props.type = BACKLIGHT_RAW;
 365         props.max_brightness = intel_panel_get_max_backlight(dev);
 366         dev_priv->backlight =
 367                 backlight_device_register("intel_backlight",
 368                                           &connector->kdev, dev,
 369                                           &intel_panel_bl_ops, &props);
 370
 371         if (IS_ERR(dev_priv->backlight)) {
 372                 DRM_ERROR("Failed to register backlight: %ld\n",
 373                           PTR_ERR(dev_priv->backlight));
 374                 dev_priv->backlight = NULL;
 375                 return -ENODEV;
 376         }
 377         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 378         return 0;
 379 }
 380
 381 void intel_panel_destroy_backlight(struct drm_device *dev)
 382 {
 383         struct drm_i915_private *dev_priv = dev->dev_private;
 384         if (dev_priv->backlight)
 385                 backlight_device_unregister(dev_priv->backlight);
 386 }
 387 #else
 388 int intel_panel_setup_backlight(struct drm_device *dev)
 389 {
 390         intel_panel_init_backlight(dev);
 391         return 0;
 392 }
 393
 394 void intel_panel_destroy_backlight(struct drm_device *dev)
 395 {
 396         return;
 397 }
 398 #endif