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  * $FreeBSD: src/sys/dev/drm2/i915/intel_panel.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  31  */
  32
  33 #include <dev/drm2/drmP.h>
  34 #include <dev/drm2/drm.h>
  35 #include <dev/drm2/i915/i915_drm.h>
  36 #include <dev/drm2/i915/intel_drv.h>
  37
  38 #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  39
  40 void
  41 intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  42                        struct drm_display_mode *adjusted_mode)
  43 {
  44         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  45         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  46         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  47         adjusted_mode->htotal = fixed_mode->htotal;
  48
  49         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  50         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  51         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  52         adjusted_mode->vtotal = fixed_mode->vtotal;
  53
  54         adjusted_mode->clock = fixed_mode->clock;
  55 }
  56
  57 /* adjusted_mode has been preset to be the panel's fixed mode */
  58 void
  59 intel_pch_panel_fitting(struct drm_device *dev,
  60                         int fitting_mode,
  61                         struct drm_display_mode *mode,
  62                         struct drm_display_mode *adjusted_mode)
  63 {
  64         struct drm_i915_private *dev_priv = dev->dev_private;
  65         int x, y, width, height;
  66
  67         x = y = width = height = 0;
  68
  69         /* Native modes don't need fitting */
  70         if (adjusted_mode->hdisplay == mode->hdisplay &&
  71             adjusted_mode->vdisplay == mode->vdisplay)
  72                 goto done;
  73
  74         switch (fitting_mode) {
  75         case DRM_MODE_SCALE_CENTER:
  76                 width = mode->hdisplay;
  77                 height = mode->vdisplay;
  78                 x = (adjusted_mode->hdisplay - width + 1)/2;
  79                 y = (adjusted_mode->vdisplay - height + 1)/2;
  80                 break;
  81
  82         case DRM_MODE_SCALE_ASPECT:
  83                 /* Scale but preserve the aspect ratio */
  84                 {
  85                         u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;
  86                         u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;
  87                         if (scaled_width > scaled_height) { /* pillar */
  88                                 width = scaled_height / mode->vdisplay;
  89                                 if (width & 1)
  90                                         width++;
  91                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  92                                 y = 0;
  93                                 height = adjusted_mode->vdisplay;
  94                         } else if (scaled_width < scaled_height) { /* letter */
  95                                 height = scaled_width / mode->hdisplay;
  96                                 if (height & 1)
  97                                         height++;
  98                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  99                                 x = 0;
 100                                 width = adjusted_mode->hdisplay;
 101                         } else {
 102                                 x = y = 0;
 103                                 width = adjusted_mode->hdisplay;
 104                                 height = adjusted_mode->vdisplay;
 105                         }
 106                 }
 107                 break;
 108
 109         default:
 110         case DRM_MODE_SCALE_FULLSCREEN:
 111                 x = y = 0;
 112                 width = adjusted_mode->hdisplay;
 113                 height = adjusted_mode->vdisplay;
 114                 break;
 115         }
 116
 117 done:
 118         dev_priv->pch_pf_pos = (x << 16) | y;
 119         dev_priv->pch_pf_size = (width << 16) | height;
 120 }
 121
 122 static int is_backlight_combination_mode(struct drm_device *dev)
 123 {
 124         struct drm_i915_private *dev_priv = dev->dev_private;
 125
 126         if (INTEL_INFO(dev)->gen >= 4)
 127                 return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
 128
 129         if (IS_GEN2(dev))
 130                 return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
 131
 132         return 0;
 133 }
 134
 135 static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)
 136 {
 137         u32 val;
 138
 139         /* Restore the CTL value if it lost, e.g. GPU reset */
 140
 141         if (HAS_PCH_SPLIT(dev_priv->dev)) {
 142                 val = I915_READ(BLC_PWM_PCH_CTL2);
 143                 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
 144                         dev_priv->saveBLC_PWM_CTL2 = val;
 145                 } else if (val == 0) {
 146                         I915_WRITE(BLC_PWM_PCH_CTL2,
 147                                    dev_priv->saveBLC_PWM_CTL2);
 148                         val = dev_priv->saveBLC_PWM_CTL2;
 149                 }
 150         } else {
 151                 val = I915_READ(BLC_PWM_CTL);
 152                 if (dev_priv->saveBLC_PWM_CTL == 0) {
 153                         dev_priv->saveBLC_PWM_CTL = val;
 154                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 155                 } else if (val == 0) {
 156                         I915_WRITE(BLC_PWM_CTL,
 157                                    dev_priv->saveBLC_PWM_CTL);
 158                         I915_WRITE(BLC_PWM_CTL2,
 159                                    dev_priv->saveBLC_PWM_CTL2);
 160                         val = dev_priv->saveBLC_PWM_CTL;
 161                 }
 162         }
 163
 164         return val;
 165 }
 166
 167 u32 intel_panel_get_max_backlight(struct drm_device *dev)
 168 {
 169         struct drm_i915_private *dev_priv = dev->dev_private;
 170         u32 max;
 171
 172         max = i915_read_blc_pwm_ctl(dev_priv);
 173         if (max == 0) {
 174                 /* XXX add code here to query mode clock or hardware clock
 175                  * and program max PWM appropriately.
 176                  */
 177 #if 0
 178                 printf("fixme: max PWM is zero.\n");
 179 #endif
 180                 return 1;
 181         }
 182
 183         if (HAS_PCH_SPLIT(dev)) {
 184                 max >>= 16;
 185         } else {
 186                 if (INTEL_INFO(dev)->gen < 4)
 187                         max >>= 17;
 188                 else
 189                         max >>= 16;
 190
 191                 if (is_backlight_combination_mode(dev))
 192                         max *= 0xff;
 193         }
 194
 195         DRM_DEBUG("max backlight PWM = %d\n", max);
 196         return max;
 197 }
 198
 199 u32 intel_panel_get_backlight(struct drm_device *dev)
 200 {
 201         struct drm_i915_private *dev_priv = dev->dev_private;
 202         u32 val;
 203
 204         if (HAS_PCH_SPLIT(dev)) {
 205                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 206         } else {
 207                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 208                 if (INTEL_INFO(dev)->gen < 4)
 209                         val >>= 1;
 210
 211                 if (is_backlight_combination_mode(dev)) {
 212                         u8 lbpc;
 213
 214                         lbpc = pci_read_config(dev->device, PCI_LBPC, 1);
 215                         val *= lbpc;
 216                 }
 217         }
 218
 219         DRM_DEBUG("get backlight PWM = %d\n", val);
 220         return val;
 221 }
 222
 223 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 224 {
 225         struct drm_i915_private *dev_priv = dev->dev_private;
 226         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 227         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 228 }
 229
 230 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 231 {
 232         struct drm_i915_private *dev_priv = dev->dev_private;
 233         u32 tmp;
 234
 235         DRM_DEBUG("set backlight PWM = %d\n", level);
 236
 237         if (HAS_PCH_SPLIT(dev))
 238                 return intel_pch_panel_set_backlight(dev, level);
 239
 240         if (is_backlight_combination_mode(dev)) {
 241                 u32 max = intel_panel_get_max_backlight(dev);
 242                 u8 lbpc;
 243
 244                 lbpc = level * 0xfe / max + 1;
 245                 level /= lbpc;
 246                 pci_write_config(dev->device, PCI_LBPC, lbpc, 4);
 247         }
 248
 249         tmp = I915_READ(BLC_PWM_CTL);
 250         if (INTEL_INFO(dev)->gen < 4)
 251                 level <<= 1;
 252         tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 253         I915_WRITE(BLC_PWM_CTL, tmp | level);
 254 }
 255
 256 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 257 {
 258         struct drm_i915_private *dev_priv = dev->dev_private;
 259
 260         dev_priv->backlight_level = level;
 261         if (dev_priv->backlight_enabled)
 262                 intel_panel_actually_set_backlight(dev, level);
 263 }
 264
 265 void intel_panel_disable_backlight(struct drm_device *dev)
 266 {
 267         struct drm_i915_private *dev_priv = dev->dev_private;
 268
 269         dev_priv->backlight_enabled = false;
 270         intel_panel_actually_set_backlight(dev, 0);
 271 }
 272
 273 void intel_panel_enable_backlight(struct drm_device *dev)
 274 {
 275         struct drm_i915_private *dev_priv = dev->dev_private;
 276
 277         if (dev_priv->backlight_level == 0)
 278                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 279
 280         dev_priv->backlight_enabled = true;
 281         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 282 }
 283
 284 static void intel_panel_init_backlight(struct drm_device *dev)
 285 {
 286         struct drm_i915_private *dev_priv = dev->dev_private;
 287
 288         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 289         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 290 }
 291
 292 enum drm_connector_status
 293 intel_panel_detect(struct drm_device *dev)
 294 {
 295 #if 0
 296         struct drm_i915_private *dev_priv = dev->dev_private;
 297 #endif
 298
 299         if (i915_panel_ignore_lid)
 300                 return i915_panel_ignore_lid > 0 ?
 301                         connector_status_connected :
 302                         connector_status_disconnected;
 303
 304         /* opregion lid state on HP 2540p is wrong at boot up,
 305          * appears to be either the BIOS or Linux ACPI fault */
 306 #if 0
 307         /* Assume that the BIOS does not lie through the OpRegion... */
 308         if (dev_priv->opregion.lid_state)
 309                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 310                         connector_status_connected :
 311                         connector_status_disconnected;
 312 #endif
 313
 314         return connector_status_unknown;
 315 }
 316
 317 int intel_panel_setup_backlight(struct drm_device *dev)
 318 {
 319         intel_panel_init_backlight(dev);
 320         return 0;
 321 }
 322
 323 void intel_panel_destroy_backlight(struct drm_device *dev)
 324 {
 325         return;
 326 }