sys/dev/drm2/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 <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <dev/drm2/drmP.h>
  35 #include <dev/drm2/drm.h>
  36 #include <dev/drm2/i915/i915_drm.h>
  37 #include <dev/drm2/i915/intel_drv.h>
  38
  39 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  40
  41 void
  42 intel_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 */
  59 void
  60 intel_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
 118 done:
 119         dev_priv->pch_pf_pos = (x << 16) | y;
 120         dev_priv->pch_pf_size = (width << 16) | height;
 121 }
 122
 123 static 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
 136 static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
 137 {
 138         u32 val;
 139
 140         /* Restore the CTL value if it lost, e.g. GPU reset */
 141
 142         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 143                 val = I915_READ(BLC_PWM_PCH_CTL2);
 144                 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
 145                         dev_priv->saveBLC_PWM_CTL2 = val;
 146                 } else if (val == 0) {
 147                         I915_WRITE(BLC_PWM_PCH_CTL2,
 148                                    dev_priv->saveBLC_PWM_CTL2);
 149                         val = dev_priv->saveBLC_PWM_CTL2;
 150                 }
 151         } else {
 152                 val = I915_READ(BLC_PWM_CTL);
 153                 if (dev_priv->saveBLC_PWM_CTL == 0) {
 154                         dev_priv->saveBLC_PWM_CTL = val;
 155                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 156                 } else if (val == 0) {
 157                         I915_WRITE(BLC_PWM_CTL,
 158                                    dev_priv->saveBLC_PWM_CTL);
 159                         I915_WRITE(BLC_PWM_CTL2,
 160                                    dev_priv->saveBLC_PWM_CTL2);
 161                         val = dev_priv->saveBLC_PWM_CTL;
 162                 }
 163         }
 164
 165         return val;
 166 }
 167
 168 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 169 {
 170         struct drm_i915_private *dev_priv = dev->dev_private;
 171         u32 max;
 172
 173         max = i915_read_blc_pwm_ctl(dev_priv);
 174         if (max == 0) {
 175                 /* XXX add code here to query mode clock or hardware clock
 176                  * and program max PWM appropriately.
 177                  */
 178 #if 0
 179                 printf("fixme: max PWM is zero.\n");
 180 #endif
 181                 return 1;
 182         }
 183
 184         if (HAS_PCH_SPLIT(dev)) {
 185                 max >>= 16;
 186         } else {
 187                 if (INTEL_INFO(dev)->gen < 4)
 188                         max >>= 17;
 189                 else
 190                         max >>= 16;
 191
 192                 if (is_backlight_combination_mode(dev))
 193                         max *= 0xff;
 194         }
 195
 196         DRM_DEBUG("max backlight PWM = %d\n", max);
 197         return max;
 198 }
 199
 200 static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 201 {
 202         struct drm_i915_private *dev_priv = dev->dev_private;
 203
 204         if (i915_panel_invert_brightness < 0)
 205                 return val;
 206
 207         if (i915_panel_invert_brightness > 0 ||
 208             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
 209                 return intel_panel_get_max_backlight(dev) - val;
 210
 211         return val;
 212 }
 213
 214 u32 intel_panel_get_backlight(struct drm_device *dev)
 215 {
 216         struct drm_i915_private *dev_priv = dev->dev_private;
 217         u32 val;
 218
 219         if (HAS_PCH_SPLIT(dev)) {
 220                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 221         } else {
 222                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 223                 if (INTEL_INFO(dev)->gen < 4)
 224                         val >>= 1;
 225
 226                 if (is_backlight_combination_mode(dev)) {
 227                         u8 lbpc;
 228
 229                         lbpc = pci_read_config(dev->dev, PCI_LBPC, 1);
 230                         val *= lbpc;
 231                 }
 232         }
 233
 234         val = intel_panel_compute_brightness(dev, val);
 235         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 236         return val;
 237 }
 238
 239 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 240 {
 241         struct drm_i915_private *dev_priv = dev->dev_private;
 242         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 243         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 244 }
 245
 246 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 247 {
 248         struct drm_i915_private *dev_priv = dev->dev_private;
 249         u32 tmp;
 250
 251         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 252         level = intel_panel_compute_brightness(dev, level);
 253
 254         if (HAS_PCH_SPLIT(dev))
 255                 return intel_pch_panel_set_backlight(dev, level);
 256
 257         if (is_backlight_combination_mode(dev)) {
 258                 u32 max = intel_panel_get_max_backlight(dev);
 259                 u8 lbpc;
 260
 261                 lbpc = level * 0xfe / max + 1;
 262                 level /= lbpc;
 263                 pci_write_config(dev->dev, PCI_LBPC, lbpc, 4);
 264         }
 265
 266         tmp = I915_READ(BLC_PWM_CTL);
 267         if (INTEL_INFO(dev)->gen < 4)
 268                 level <<= 1;
 269         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 270         I915_WRITE(BLC_PWM_CTL, tmp | level);
 271 }
 272
 273 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 274 {
 275         struct drm_i915_private *dev_priv = dev->dev_private;
 276
 277         dev_priv->backlight_level = level;
 278         if (dev_priv->backlight_enabled)
 279                 intel_panel_actually_set_backlight(dev, level);
 280 }
 281
 282 void intel_panel_disable_backlight(struct drm_device *dev)
 283 {
 284         struct drm_i915_private *dev_priv = dev->dev_private;
 285
 286         dev_priv->backlight_enabled = false;
 287         intel_panel_actually_set_backlight(dev, 0);
 288 }
 289
 290 void intel_panel_enable_backlight(struct drm_device *dev)
 291 {
 292         struct drm_i915_private *dev_priv = dev->dev_private;
 293
 294         if (dev_priv->backlight_level == 0)
 295                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 296
 297         dev_priv->backlight_enabled = true;
 298         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 299 }
 300
 301 static void intel_panel_init_backlight(struct drm_device *dev)
 302 {
 303         struct drm_i915_private *dev_priv = dev->dev_private;
 304
 305         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 306         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 307 }
 308
 309 enum drm_connector_status
 310 intel_panel_detect(struct drm_device *dev)
 311 {
 312 #if 0
 313         struct drm_i915_private *dev_priv = dev->dev_private;
 314 #endif
 315
 316         if (i915_panel_ignore_lid)
 317                 return i915_panel_ignore_lid > 0 ?
 318                         connector_status_connected :
 319                         connector_status_disconnected;
 320
 321         /* opregion lid state on HP 2540p is wrong at boot up,
 322          * appears to be either the BIOS or Linux ACPI fault */
 323 #if 0
 324         /* Assume that the BIOS does not lie through the OpRegion... */
 325         if (dev_priv->opregion.lid_state)
 326                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 327                         connector_status_connected :
 328                         connector_status_disconnected;
 329 #endif
 330
 331         return connector_status_unknown;
 332 }
 333
 334 int intel_panel_setup_backlight(struct drm_device *dev)
 335 {
 336         intel_panel_init_backlight(dev);
 337         return 0;
 338 }
 339
 340 void intel_panel_destroy_backlight(struct drm_device *dev)
 341 {
 342         return;
 343 }