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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_i915_private *dev_priv)
  134. {
  135.         u32 val;
  136.  
  137.         /* Restore the CTL value if it lost, e.g. GPU reset */
  138.  
  139.         if (HAS_PCH_SPLIT(dev_priv->dev)) {
  140.                 val = I915_READ(BLC_PWM_PCH_CTL2);
  141.                 if (dev_priv->saveBLC_PWM_CTL2 == 0) {
  142.                         dev_priv->saveBLC_PWM_CTL2 = val;
  143.                 } else if (val == 0) {
  144.                         I915_WRITE(BLC_PWM_PCH_CTL2,
  145.                                    dev_priv->saveBLC_PWM_CTL2);
  146.                         val = dev_priv->saveBLC_PWM_CTL2;
  147.                 }
  148.         } else {
  149.                 val = I915_READ(BLC_PWM_CTL);
  150.                 if (dev_priv->saveBLC_PWM_CTL == 0) {
  151.                         dev_priv->saveBLC_PWM_CTL = val;
  152.                         dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
  153.                 } else if (val == 0) {
  154.                         I915_WRITE(BLC_PWM_CTL,
  155.                                    dev_priv->saveBLC_PWM_CTL);
  156.                         I915_WRITE(BLC_PWM_CTL2,
  157.                                    dev_priv->saveBLC_PWM_CTL2);
  158.                         val = dev_priv->saveBLC_PWM_CTL;
  159.                 }
  160.         }
  161.  
  162.         return val;
  163. }
  164.  
  165. static u32 _intel_panel_get_max_backlight(struct drm_device *dev)
  166. {
  167.         struct drm_i915_private *dev_priv = dev->dev_private;
  168.         u32 max;
  169.  
  170.         max = i915_read_blc_pwm_ctl(dev_priv);
  171.  
  172.         if (HAS_PCH_SPLIT(dev)) {
  173.                 max >>= 16;
  174.         } else {
  175.                 if (INTEL_INFO(dev)->gen < 4)
  176.                         max >>= 17;
  177.                 else
  178.                         max >>= 16;
  179.  
  180.                 if (is_backlight_combination_mode(dev))
  181.                         max *= 0xff;
  182.         }
  183.  
  184.         return max;
  185. }
  186.  
  187. u32 intel_panel_get_max_backlight(struct drm_device *dev)
  188. {
  189.         u32 max;
  190.  
  191.         max = _intel_panel_get_max_backlight(dev);
  192.         if (max == 0) {
  193.                 /* XXX add code here to query mode clock or hardware clock
  194.                  * and program max PWM appropriately.
  195.                  */
  196.         printk("fixme: max PWM is zero\n");
  197.                 return 1;
  198.         }
  199.  
  200.         DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);
  201.         return max;
  202. }
  203.  
  204. static int i915_panel_invert_brightness;
  205. MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
  206.         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
  207.         "report PCI device ID, subsystem vendor and subsystem device ID "
  208.         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
  209.         "It will then be included in an upcoming module version.");
  210. module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
  211. static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
  212. {
  213.         struct drm_i915_private *dev_priv = dev->dev_private;
  214.  
  215.         if (i915_panel_invert_brightness < 0)
  216.                 return val;
  217.  
  218.         if (i915_panel_invert_brightness > 0 ||
  219.             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
  220.                 return intel_panel_get_max_backlight(dev) - val;
  221.  
  222.         return val;
  223. }
  224.  
  225. static u32 intel_panel_get_backlight(struct drm_device *dev)
  226. {
  227.         struct drm_i915_private *dev_priv = dev->dev_private;
  228.         u32 val;
  229.  
  230.         if (HAS_PCH_SPLIT(dev)) {
  231.                 val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  232.         } else {
  233.                 val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  234.                 if (INTEL_INFO(dev)->gen < 4)
  235.                         val >>= 1;
  236.  
  237.                 if (is_backlight_combination_mode(dev)) {
  238.                         u8 lbpc;
  239.  
  240.                         pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
  241.                         val *= lbpc;
  242.                 }
  243.         }
  244.  
  245.         val = intel_panel_compute_brightness(dev, val);
  246.         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
  247.         return val;
  248. }
  249.  
  250. static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
  251. {
  252.         struct drm_i915_private *dev_priv = dev->dev_private;
  253.         u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  254.         I915_WRITE(BLC_PWM_CPU_CTL, val | level);
  255. }
  256.  
  257. static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)
  258. {
  259.         struct drm_i915_private *dev_priv = dev->dev_private;
  260.         u32 tmp;
  261.  
  262.         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
  263.         level = intel_panel_compute_brightness(dev, level);
  264.  
  265.         if (HAS_PCH_SPLIT(dev))
  266.                 return intel_pch_panel_set_backlight(dev, level);
  267.  
  268.         if (is_backlight_combination_mode(dev)) {
  269.                 u32 max = intel_panel_get_max_backlight(dev);
  270.                 u8 lbpc;
  271.  
  272.                 lbpc = level * 0xfe / max + 1;
  273.                 level /= lbpc;
  274.                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
  275.         }
  276.  
  277.         tmp = I915_READ(BLC_PWM_CTL);
  278.         if (INTEL_INFO(dev)->gen < 4)
  279.                 level <<= 1;
  280.                 tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
  281.         I915_WRITE(BLC_PWM_CTL, tmp | level);
  282. }
  283.  
  284. void intel_panel_set_backlight(struct drm_device *dev, u32 level)
  285. {
  286.         struct drm_i915_private *dev_priv = dev->dev_private;
  287.  
  288.         dev_priv->backlight_level = level;
  289.         if (dev_priv->backlight_enabled)
  290.                 intel_panel_actually_set_backlight(dev, level);
  291. }
  292.  
  293. void intel_panel_disable_backlight(struct drm_device *dev)
  294. {
  295.         struct drm_i915_private *dev_priv = dev->dev_private;
  296.  
  297.                 dev_priv->backlight_enabled = false;
  298.         intel_panel_actually_set_backlight(dev, 0);
  299.  
  300.         if (INTEL_INFO(dev)->gen >= 4) {
  301.                 uint32_t reg, tmp;
  302.  
  303.                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
  304.  
  305.                 I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE);
  306.  
  307.                 if (HAS_PCH_SPLIT(dev)) {
  308.                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  309.                         tmp &= ~BLM_PCH_PWM_ENABLE;
  310.                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
  311.                 }
  312.         }
  313. }
  314.  
  315. void intel_panel_enable_backlight(struct drm_device *dev,
  316.                                   enum pipe pipe)
  317. {
  318.         struct drm_i915_private *dev_priv = dev->dev_private;
  319.  
  320.         if (dev_priv->backlight_level == 0)
  321.                 dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
  322.  
  323.         if (INTEL_INFO(dev)->gen >= 4) {
  324.                 uint32_t reg, tmp;
  325.  
  326.                 reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2;
  327.  
  328.  
  329.                 tmp = I915_READ(reg);
  330.  
  331.                 /* Note that this can also get called through dpms changes. And
  332.                  * we don't track the backlight dpms state, hence check whether
  333.                  * we have to do anything first. */
  334.                 if (tmp & BLM_PWM_ENABLE)
  335.                         goto set_level;
  336.  
  337.                 if (dev_priv->num_pipe == 3)
  338.                         tmp &= ~BLM_PIPE_SELECT_IVB;
  339.                 else
  340.                         tmp &= ~BLM_PIPE_SELECT;
  341.  
  342.                 tmp |= BLM_PIPE(pipe);
  343.                 tmp &= ~BLM_PWM_ENABLE;
  344.  
  345.                 I915_WRITE(reg, tmp);
  346.                 POSTING_READ(reg);
  347.                 I915_WRITE(reg, tmp | BLM_PWM_ENABLE);
  348.  
  349.                 if (HAS_PCH_SPLIT(dev)) {
  350.                         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  351.                         tmp |= BLM_PCH_PWM_ENABLE;
  352.                         tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
  353.                         I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
  354.                 }
  355.         }
  356.  
  357. set_level:
  358.         /* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
  359.          * BLC_PWM_CPU_CTL may be cleared to zero automatically when these
  360.          * registers are set.
  361.          */
  362.         dev_priv->backlight_enabled = true;
  363.         intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);
  364. }
  365.  
  366. static void intel_panel_init_backlight(struct drm_device *dev)
  367. {
  368.         struct drm_i915_private *dev_priv = dev->dev_private;
  369.  
  370.         dev_priv->backlight_level = intel_panel_get_backlight(dev);
  371.         dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
  372. }
  373.  
  374. enum drm_connector_status
  375. intel_panel_detect(struct drm_device *dev)
  376. {
  377. #if 0
  378.         struct drm_i915_private *dev_priv = dev->dev_private;
  379. #endif
  380.  
  381.         if (i915_panel_ignore_lid)
  382.                 return i915_panel_ignore_lid > 0 ?
  383.                         connector_status_connected :
  384.                         connector_status_disconnected;
  385.  
  386.         /* opregion lid state on HP 2540p is wrong at boot up,
  387.          * appears to be either the BIOS or Linux ACPI fault */
  388. #if 0
  389.         /* Assume that the BIOS does not lie through the OpRegion... */
  390.         if (dev_priv->opregion.lid_state)
  391.                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
  392.                         connector_status_connected :
  393.                         connector_status_disconnected;
  394. #endif
  395.  
  396.         return connector_status_unknown;
  397. }
  398.  
  399. #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  400. static int intel_panel_update_status(struct backlight_device *bd)
  401. {
  402.         struct drm_device *dev = bl_get_data(bd);
  403.         intel_panel_set_backlight(dev, bd->props.brightness);
  404.         return 0;
  405. }
  406.  
  407. static int intel_panel_get_brightness(struct backlight_device *bd)
  408. {
  409.         struct drm_device *dev = bl_get_data(bd);
  410.         struct drm_i915_private *dev_priv = dev->dev_private;
  411.         return dev_priv->backlight_level;
  412. }
  413.  
  414. static const struct backlight_ops intel_panel_bl_ops = {
  415.         .update_status = intel_panel_update_status,
  416.         .get_brightness = intel_panel_get_brightness,
  417. };
  418.  
  419. int intel_panel_setup_backlight(struct drm_device *dev)
  420. {
  421.         struct drm_i915_private *dev_priv = dev->dev_private;
  422.         struct backlight_properties props;
  423.         struct drm_connector *connector;
  424.  
  425.         intel_panel_init_backlight(dev);
  426.  
  427.         if (dev_priv->int_lvds_connector)
  428.                 connector = dev_priv->int_lvds_connector;
  429.         else if (dev_priv->int_edp_connector)
  430.                 connector = dev_priv->int_edp_connector;
  431.         else
  432.                 return -ENODEV;
  433.  
  434.         memset(&props, 0, sizeof(props));
  435.         props.type = BACKLIGHT_RAW;
  436.         props.max_brightness = _intel_panel_get_max_backlight(dev);
  437.         if (props.max_brightness == 0) {
  438.                 DRM_DEBUG_DRIVER("Failed to get maximum backlight value\n");
  439.                 return -ENODEV;
  440.         }
  441.         dev_priv->backlight =
  442.                 backlight_device_register("intel_backlight",
  443.                                           &connector->kdev, dev,
  444.                                           &intel_panel_bl_ops, &props);
  445.  
  446.         if (IS_ERR(dev_priv->backlight)) {
  447.                 DRM_ERROR("Failed to register backlight: %ld\n",
  448.                           PTR_ERR(dev_priv->backlight));
  449.                 dev_priv->backlight = NULL;
  450.                 return -ENODEV;
  451.         }
  452.         dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);
  453.         return 0;
  454. }
  455.  
  456. void intel_panel_destroy_backlight(struct drm_device *dev)
  457. {
  458.         struct drm_i915_private *dev_priv = dev->dev_private;
  459.         if (dev_priv->backlight)
  460.                 backlight_device_unregister(dev_priv->backlight);
  461. }
  462. #else
  463. int intel_panel_setup_backlight(struct drm_device *dev)
  464. {
  465.         intel_panel_init_backlight(dev);
  466.         return 0;
  467. }
  468.  
  469. void intel_panel_destroy_backlight(struct drm_device *dev)
  470. {
  471.         return;
  472. }
  473. #endif
  474.