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 (IS_PINEVIEW(dev)) {
 182                         max >>= 17;
 183                 } else {
 184                         max >>= 16;
 185                         if (INTEL_INFO(dev)->gen < 4)
 186                                 max &= ~1;
 187                 }
 188
 189                 if (is_backlight_combination_mode(dev))
 190                         max *= 0xff;
 191         }
 192
 193         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
 194         return max;
 195 }
 196
 197 u32 intel_panel_get_backlight(struct drm_device *dev)
 198 {
 199         struct drm_i915_private *dev_priv = dev->dev_private;
 200         u32 val;
 201
 202         if (HAS_PCH_SPLIT(dev)) {
 203                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 204         } else {
 205                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
 206                 if (IS_PINEVIEW(dev))
 207                         val >>= 1;
 208
 209                 if (is_backlight_combination_mode(dev)) {
 210                         u8 lbpc;
 211
 212                         val &= ~1;
 213                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 214                         val *= lbpc;
 215                 }
 216         }
 217
 218         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
 219         return val;
 220 }
 221
 222 static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 223 {
 224         struct drm_i915_private *dev_priv = dev->dev_private;
 225         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 226         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
 227 }
 228
 229 static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
 230 {
 231         struct drm_i915_private *dev_priv = dev->dev_private;
 232         u32 tmp;
 233
 234         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 235
 236         if (HAS_PCH_SPLIT(dev))
 237                 return intel_pch_panel_set_backlight(dev, level);
 238
 239         if (is_backlight_combination_mode(dev)) {
 240                 u32 max = intel_panel_get_max_backlight(dev);
 241                 u8 lbpc;
 242
 243                 lbpc = level * 0xfe / max + 1;
 244                 level /= lbpc;
 245                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
 246         }
 247
 248         tmp = I915_READ(BLC_PWM_CTL);
 249         if (IS_PINEVIEW(dev)) {
 250                 tmp &= ~(BACKLIGHT_DUTY_CYCLE_MASK - 1);
 251                 level <<= 1;
 252         } else
 253                 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
 254         I915_WRITE(BLC_PWM_CTL, tmp | level);
 255 }
 256
 257 void intel_panel_set_backlight(struct drm_device *dev, u32 level)
 258 {
 259         struct drm_i915_private *dev_priv = dev->dev_private;
 260
 261         dev_priv->backlight_level = level;
 262         if (dev_priv->backlight_enabled)
 263                 intel_panel_actually_set_backlight(dev, level);
 264 }
 265
 266 void intel_panel_disable_backlight(struct drm_device *dev)
 267 {
 268         struct drm_i915_private *dev_priv = dev->dev_private;
 269
 270         dev_priv->backlight_enabled = false;
 271         intel_panel_actually_set_backlight(dev, 0);
 272 }
 273
 274 void intel_panel_enable_backlight(struct drm_device *dev)
 275 {
 276         struct drm_i915_private *dev_priv = dev->dev_private;
 277
 278         if (dev_priv->backlight_level == 0)
 279                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
 280
 281         dev_priv->backlight_enabled = true;
 282         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
 283 }
 284
 285 static void intel_panel_init_backlight(struct drm_device *dev)
 286 {
 287         struct drm_i915_private *dev_priv = dev->dev_private;
 288
 289         dev_priv->backlight_level = intel_panel_get_backlight(dev);
 290         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
 291 }
 292
 293 enum drm_connector_status
 294 intel_panel_detect(struct drm_device *dev)
 295 {
 296 #if 0
 297         struct drm_i915_private *dev_priv = dev->dev_private;
 298 #endif
 299
 300         if (i915_panel_ignore_lid)
 301                 return i915_panel_ignore_lid > 0 ?
 302                         connector_status_connected :
 303                         connector_status_disconnected;
 304
 305         /* opregion lid state on HP 2540p is wrong at boot up,
 306          * appears to be either the BIOS or Linux ACPI fault */
 307 #if 0
 308         /* Assume that the BIOS does not lie through the OpRegion... */
 309         if (dev_priv->opregion.lid_state)
 310                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
 311                         connector_status_connected :
 312                         connector_status_disconnected;
 313 #endif
 314
 315         return connector_status_unknown;
 316 }
 317
 318 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 319 static int intel_panel_update_status(struct backlight_device *bd)
 320 {
 321         struct drm_device *dev = bl_get_data(bd);
 322         intel_panel_set_backlight(dev, bd->props.brightness);
 323         return 0;
 324 }
 325
 326 static int intel_panel_get_brightness(struct backlight_device *bd)
 327 {
 328         struct drm_device *dev = bl_get_data(bd);
 329         return intel_panel_get_backlight(dev);
 330 }
 331
 332 static const struct backlight_ops intel_panel_bl_ops = {
 333         .update_status = intel_panel_update_status,
 334         .get_brightness = intel_panel_get_brightness,
 335 };
 336
 337 int intel_panel_setup_backlight(struct drm_device *dev)
 338 {
 339         struct drm_i915_private *dev_priv = dev->dev_private;
 340         struct backlight_properties props;
 341         struct drm_connector *connector;
 342
 343         intel_panel_init_backlight(dev);
 344
 345         if (dev_priv->int_lvds_connector)
 346                 connector = dev_priv->int_lvds_connector;
 347         else if (dev_priv->int_edp_connector)
 348                 connector = dev_priv->int_edp_connector;
 349         else
 350                 return -ENODEV;
 351
 352         props.type = BACKLIGHT_RAW;
 353         props.max_brightness = intel_panel_get_max_backlight(dev);
 354         dev_priv->backlight =
 355                 backlight_device_register("intel_backlight",
 356                                           &connector->kdev, dev,
 357                                           &intel_panel_bl_ops, &props);
 358
 359         if (IS_ERR(dev_priv->backlight)) {
 360                 DRM_ERROR("Failed to register backlight: %ld\n",
 361                           PTR_ERR(dev_priv->backlight));
 362                 dev_priv->backlight = NULL;
 363                 return -ENODEV;
 364         }
 365         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
 366         return 0;
 367 }
 368
 369 void intel_panel_destroy_backlight(struct drm_device *dev)
 370 {
 371         struct drm_i915_private *dev_priv = dev->dev_private;
 372         if (dev_priv->backlight)
 373                 backlight_device_unregister(dev_priv->backlight);
 374 }
 375 #else
 376 int intel_panel_setup_backlight(struct drm_device *dev)
 377 {
 378         intel_panel_init_backlight(dev);
 379         return 0;
 380 }
 381
 382 void intel_panel_destroy_backlight(struct drm_device *dev)
 383 {
 384         return;
 385 }
 386 #endif