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