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  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. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32.  
  33. #include <linux/moduleparam.h>
  34. #include "intel_drv.h"
  35.  
  36. #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */
  37.  
  38. void
  39. intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
  40.                        struct drm_display_mode *adjusted_mode)
  41. {
  42.         adjusted_mode->hdisplay = fixed_mode->hdisplay;
  43.         adjusted_mode->hsync_start = fixed_mode->hsync_start;
  44.         adjusted_mode->hsync_end = fixed_mode->hsync_end;
  45.         adjusted_mode->htotal = fixed_mode->htotal;
  46.  
  47.         adjusted_mode->vdisplay = fixed_mode->vdisplay;
  48.         adjusted_mode->vsync_start = fixed_mode->vsync_start;
  49.         adjusted_mode->vsync_end = fixed_mode->vsync_end;
  50.         adjusted_mode->vtotal = fixed_mode->vtotal;
  51.  
  52.         adjusted_mode->clock = fixed_mode->clock;
  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.                         const 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_device *dev)
  134. {
  135.         struct drm_i915_private *dev_priv = dev->dev_private;
  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->regfile.saveBLC_PWM_CTL2 == 0) {
  143.                         dev_priv->regfile.saveBLC_PWM_CTL2 = val;
  144.                 } else if (val == 0) {
  145.                         val = dev_priv->regfile.saveBLC_PWM_CTL2;
  146.                         I915_WRITE(BLC_PWM_PCH_CTL2, val);
  147.                 }
  148.         } else {
  149.                 val = I915_READ(BLC_PWM_CTL);
  150.                 if (dev_priv->regfile.saveBLC_PWM_CTL == 0) {
  151.                         dev_priv->regfile.saveBLC_PWM_CTL = val;
  152.                         if (INTEL_INFO(dev)->gen >= 4)
  153.                                 dev_priv->regfile.saveBLC_PWM_CTL2 =
  154.                                         I915_READ(BLC_PWM_CTL2);
  155.                 } else if (val == 0) {
  156.                         val = dev_priv->regfile.saveBLC_PWM_CTL;
  157.                         I915_WRITE(BLC_PWM_CTL, val);
  158.                         if (INTEL_INFO(dev)->gen >= 4)
  159.                         I915_WRITE(BLC_PWM_CTL2,
  160.                                            dev_priv->regfile.saveBLC_PWM_CTL2);
  161.                 }
  162.         }
  163.  
  164.         return val;
  165. }
  166.  
  167. static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
  168. {
  169.         u32 max;
  170.  
  171.         max = i915_read_blc_pwm_ctl(dev);
  172.  
  173.         if (HAS_PCH_SPLIT(dev)) {
  174.                 max >>= 16;
  175.         } else {
  176.                 if (INTEL_INFO(dev)->gen < 4)
  177.                         max >>= 17;
  178.                 else
  179.                         max >>= 16;
  180.  
  181.                 if (is_backlight_combination_mode(dev))
  182.                         max *= 0xff;
  183.         }
  184.  
  185.         return max;
  186. }
  187.  
  188. u32 intel_panel_get_max_backlight(struct drm_device *dev)
  189. {
  190.         u32 max;
  191.  
  192.         max = _intel_panel_get_max_backlight(dev);
  193.         if (max == 0) {
  194.                 /* XXX add code here to query mode clock or hardware clock
  195.                  * and program max PWM appropriately.
  196.                  */
  197.                 pr_warn_once("fixme: max PWM is zero\n");
  198.                 return 1;
  199.         }
  200.  
  201.         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
  202.         return max;
  203. }
  204.  
  205. static int i915_panel_invert_brightness;
  206. MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
  207.         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
  208.         "report PCI device ID, subsystem vendor and subsystem device ID "
  209.         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
  210.         "It will then be included in an upcoming module version.");
  211. module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
  212. static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
  213. {
  214.         struct drm_i915_private *dev_priv = dev->dev_private;
  215.  
  216.         if (i915_panel_invert_brightness < 0)
  217.                 return val;
  218.  
  219.         if (i915_panel_invert_brightness > 0 ||
  220.             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
  221.                 return intel_panel_get_max_backlight(dev) - val;
  222.  
  223.         return val;
  224. }
  225.  
  226. static u32 intel_panel_get_backlight(struct drm_device *dev)
  227. {
  228.         struct drm_i915_private *dev_priv = dev->dev_private;
  229.         u32 val;
  230.  
  231.         if (HAS_PCH_SPLIT(dev)) {
  232.                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  233.         } else {
  234.                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  235.                 if (INTEL_INFO(dev)->gen < 4)
  236.                         val >>= 1;
  237.  
  238.                 if (is_backlight_combination_mode(dev)) {
  239.                         u8 lbpc;
  240.  
  241.                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
  242.                         val *= lbpc;
  243.                 }
  244.         }
  245.  
  246.         val = intel_panel_compute_brightness(dev, val);
  247.         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
  248.         return val;
  249. }
  250.  
  251. static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
  252. {
  253.         struct drm_i915_private *dev_priv = dev->dev_private;
  254.         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  255.         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
  256. }
  257.  
  258. static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
  259. {
  260.         struct drm_i915_private *dev_priv = dev->dev_private;
  261.         u32 tmp;
  262.  
  263.         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
  264.         level = intel_panel_compute_brightness(dev, level);
  265.  
  266.         if (HAS_PCH_SPLIT(dev))
  267.                 return intel_pch_panel_set_backlight(dev, level);
  268.  
  269.         if (is_backlight_combination_mode(dev)) {
  270.                 u32 max = intel_panel_get_max_backlight(dev);
  271.                 u8 lbpc;
  272.  
  273.                 lbpc = level * 0xfe / max + 1;
  274.                 level /= lbpc;
  275.                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
  276.         }
  277.  
  278.         tmp = I915_READ(BLC_PWM_CTL);
  279.         if (INTEL_INFO(dev)->gen < 4)
  280.                 level <<= 1;
  281.                 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
  282.         I915_WRITE(BLC_PWM_CTL, tmp | level);
  283. }
  284.  
  285. void intel_panel_set_backlight(struct drm_device *dev, u32 level)
  286. {
  287.         struct drm_i915_private *dev_priv = dev->dev_private;
  288.  
  289.         dev_priv->backlight_level = level;
  290.         if (dev_priv->backlight_enabled)
  291.                 intel_panel_actually_set_backlight(dev, level);
  292. }
  293.  
  294. void intel_panel_disable_backlight(struct drm_device *dev)
  295. {
  296.         struct drm_i915_private *dev_priv = dev->dev_private;
  297.  
  298.                 dev_priv->backlight_enabled = false;
  299.         intel_panel_actually_set_backlight(dev, 0);
  300.  
  301.         if (INTEL_INFO(dev)->gen >= 4) {
  302.                 uint32_t reg, tmp;
  303.  
  304.                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
  305.  
  306.                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
  307.  
  308.                 if (HAS_PCH_SPLIT(dev)) {
  309.                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  310.                         tmp &= ~BLM_PCH_PWM_ENABLE;
  311.                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
  312.                 }
  313.         }
  314. }
  315.  
  316. void intel_panel_enable_backlight(struct drm_device *dev,
  317.                                   enum pipe pipe)
  318. {
  319.         struct drm_i915_private *dev_priv = dev->dev_private;
  320.  
  321.         if (dev_priv->backlight_level == 0)
  322.                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
  323.  
  324.         if (INTEL_INFO(dev)->gen >= 4) {
  325.                 uint32_t reg, tmp;
  326.  
  327.                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
  328.  
  329.  
  330.                 tmp = I915_READ(reg);
  331.  
  332.                 /* Note that this can also get called through dpms changes. And
  333.                  * we don't track the backlight dpms state, hence check whether
  334.                  * we have to do anything first. */
  335.                 if (tmp & BLM_PWM_ENABLE)
  336.                         goto set_level;
  337.  
  338.                 if (dev_priv->num_pipe == 3)
  339.                         tmp &= ~BLM_PIPE_SELECT_IVB;
  340.                 else
  341.                         tmp &= ~BLM_PIPE_SELECT;
  342.  
  343.                 tmp |= BLM_PIPE(pipe);
  344.                 tmp &= ~BLM_PWM_ENABLE;
  345.  
  346.                 I915_WRITE(reg, tmp);
  347.                 POSTING_READ(reg);
  348.                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
  349.  
  350.                 if (HAS_PCH_SPLIT(dev)) {
  351.                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  352.                         tmp |= BLM_PCH_PWM_ENABLE;
  353.                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
  354.                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
  355.                 }
  356.         }
  357.  
  358. set_level:
  359.         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
  360.          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
  361.          * registers are set.
  362.          */
  363.         dev_priv->backlight_enabled = true;
  364.         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
  365. }
  366.  
  367. static void intel_panel_init_backlight(struct drm_device *dev)
  368. {
  369.         struct drm_i915_private *dev_priv = dev->dev_private;
  370.  
  371.         dev_priv->backlight_level = intel_panel_get_backlight(dev);
  372.         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
  373. }
  374.  
  375. enum drm_connector_status
  376. intel_panel_detect(struct drm_device *dev)
  377. {
  378.         struct drm_i915_private *dev_priv = dev->dev_private;
  379.  
  380.         /* Assume that the BIOS does not lie through the OpRegion... */
  381.         if (!i915_panel_ignore_lid && dev_priv->opregion.lid_state) {
  382.                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
  383.                         connector_status_connected :
  384.                         connector_status_disconnected;
  385.         }
  386.  
  387.         switch (i915_panel_ignore_lid) {
  388.         case -2:
  389.                 return connector_status_connected;
  390.         case -1:
  391.                 return connector_status_disconnected;
  392.         default:
  393.         return connector_status_unknown;
  394.         }
  395. }
  396.  
  397. #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  398. static int intel_panel_update_status(struct backlight_device *bd)
  399. {
  400.         struct drm_device *dev = bl_get_data(bd);
  401.         intel_panel_set_backlight(dev, bd->props.brightness);
  402.         return 0;
  403. }
  404.  
  405. static int intel_panel_get_brightness(struct backlight_device *bd)
  406. {
  407.         struct drm_device *dev = bl_get_data(bd);
  408.         struct drm_i915_private *dev_priv = dev->dev_private;
  409.         return dev_priv->backlight_level;
  410. }
  411.  
  412. static const struct backlight_ops intel_panel_bl_ops = {
  413.         .update_status = intel_panel_update_status,
  414.         .get_brightness = intel_panel_get_brightness,
  415. };
  416.  
  417. int intel_panel_setup_backlight(struct drm_connector *connector)
  418. {
  419.         struct drm_device *dev = connector->dev;
  420.         struct drm_i915_private *dev_priv = dev->dev_private;
  421.         struct backlight_properties props;
  422.  
  423.         intel_panel_init_backlight(dev);
  424.  
  425.         memset(&props, 0, sizeof(props));
  426.         props.type = BACKLIGHT_RAW;
  427.         props.max_brightness = _intel_panel_get_max_backlight(dev);
  428.         if (props.max_brightness == 0) {
  429.                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
  430.                 return -ENODEV;
  431.         }
  432.         dev_priv->backlight =
  433.                 backlight_device_register("intel_backlight",
  434.                                           &connector->kdev, dev,
  435.                                           &intel_panel_bl_ops, &props);
  436.  
  437.         if (IS_ERR(dev_priv->backlight)) {
  438.                 DRM_ERROR("Failed to register backlight: %ld\n",
  439.                           PTR_ERR(dev_priv->backlight));
  440.                 dev_priv->backlight = NULL;
  441.                 return -ENODEV;
  442.         }
  443.         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
  444.         return 0;
  445. }
  446.  
  447. void intel_panel_destroy_backlight(struct drm_device *dev)
  448. {
  449.         struct drm_i915_private *dev_priv = dev->dev_private;
  450.         if (dev_priv->backlight)
  451.                 backlight_device_unregister(dev_priv->backlight);
  452. }
  453. #else
  454. int intel_panel_setup_backlight(struct drm_connector *connector)
  455. {
  456.         intel_panel_init_backlight(connector->dev);
  457.         return 0;
  458. }
  459.  
  460. void intel_panel_destroy_backlight(struct drm_device *dev)
  461. {
  462.         return;
  463. }
  464. #endif
  465.  
  466. int intel_panel_init(struct intel_panel *panel,
  467.                      struct drm_display_mode *fixed_mode)
  468. {
  469.         panel->fixed_mode = fixed_mode;
  470.  
  471.         return 0;
  472. }
  473.  
  474. void intel_panel_fini(struct intel_panel *panel)
  475. {
  476.         struct intel_connector *intel_connector =
  477.                 container_of(panel, struct intel_connector, panel);
  478.  
  479.         if (panel->fixed_mode)
  480.                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
  481. }
  482.