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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. void
  37. intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  38.                        struct drm_display_mode *adjusted_mode)
  39. {
  40.         drm_mode_copy(adjusted_mode, fixed_mode);
  41.  
  42.         drm_mode_set_crtcinfo(adjusted_mode, 0);
  43. }
  44.  
  45. /**
  46.  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  47.  * @dev: drm device
  48.  * @fixed_mode : panel native mode
  49.  * @connector: LVDS/eDP connector
  50.  *
  51.  * Return downclock_avail
  52.  * Find the reduced downclock for LVDS/eDP in EDID.
  53.  */
  54. struct drm_display_mode *
  55. intel_find_panel_downclock(struct drm_device *dev,
  56.                         struct drm_display_mode *fixed_mode,
  57.                         struct drm_connector *connector)
  58. {
  59.         struct drm_display_mode *scan, *tmp_mode;
  60.         int temp_downclock;
  61.  
  62.         temp_downclock = fixed_mode->clock;
  63.         tmp_mode = NULL;
  64.  
  65.         list_for_each_entry(scan, &connector->probed_modes, head) {
  66.                 /*
  67.                  * If one mode has the same resolution with the fixed_panel
  68.                  * mode while they have the different refresh rate, it means
  69.                  * that the reduced downclock is found. In such
  70.                  * case we can set the different FPx0/1 to dynamically select
  71.                  * between low and high frequency.
  72.                  */
  73.                 if (scan->hdisplay == fixed_mode->hdisplay &&
  74.                     scan->hsync_start == fixed_mode->hsync_start &&
  75.                     scan->hsync_end == fixed_mode->hsync_end &&
  76.                     scan->htotal == fixed_mode->htotal &&
  77.                     scan->vdisplay == fixed_mode->vdisplay &&
  78.                     scan->vsync_start == fixed_mode->vsync_start &&
  79.                     scan->vsync_end == fixed_mode->vsync_end &&
  80.                     scan->vtotal == fixed_mode->vtotal) {
  81.                         if (scan->clock < temp_downclock) {
  82.                                 /*
  83.                                  * The downclock is already found. But we
  84.                                  * expect to find the lower downclock.
  85.                                  */
  86.                                 temp_downclock = scan->clock;
  87.                                 tmp_mode = scan;
  88.                         }
  89.                 }
  90.         }
  91.  
  92.         if (temp_downclock < fixed_mode->clock)
  93.                 return drm_mode_duplicate(dev, tmp_mode);
  94.         else
  95.                 return NULL;
  96. }
  97.  
  98. /* adjusted_mode has been preset to be the panel's fixed mode */
  99. void
  100. intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  101.                         struct intel_crtc_config *pipe_config,
  102.                         int fitting_mode)
  103. {
  104.         struct drm_display_mode *adjusted_mode;
  105.         int x, y, width, height;
  106.  
  107.         adjusted_mode = &pipe_config->adjusted_mode;
  108.  
  109.         x = y = width = height = 0;
  110.  
  111.         /* Native modes don't need fitting */
  112.         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
  113.             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
  114.                 goto done;
  115.  
  116.         switch (fitting_mode) {
  117.         case DRM_MODE_SCALE_CENTER:
  118.                 width = pipe_config->pipe_src_w;
  119.                 height = pipe_config->pipe_src_h;
  120.                 x = (adjusted_mode->hdisplay - width + 1)/2;
  121.                 y = (adjusted_mode->vdisplay - height + 1)/2;
  122.                 break;
  123.  
  124.         case DRM_MODE_SCALE_ASPECT:
  125.                 /* Scale but preserve the aspect ratio */
  126.                 {
  127.                         u32 scaled_width = adjusted_mode->hdisplay
  128.                                 * pipe_config->pipe_src_h;
  129.                         u32 scaled_height = pipe_config->pipe_src_w
  130.                                 * adjusted_mode->vdisplay;
  131.                         if (scaled_width > scaled_height) { /* pillar */
  132.                                 width = scaled_height / pipe_config->pipe_src_h;
  133.                                 if (width & 1)
  134.                                         width++;
  135.                                 x = (adjusted_mode->hdisplay - width + 1) / 2;
  136.                                 y = 0;
  137.                                 height = adjusted_mode->vdisplay;
  138.                         } else if (scaled_width < scaled_height) { /* letter */
  139.                                 height = scaled_width / pipe_config->pipe_src_w;
  140.                                 if (height & 1)
  141.                                     height++;
  142.                                 y = (adjusted_mode->vdisplay - height + 1) / 2;
  143.                                 x = 0;
  144.                                 width = adjusted_mode->hdisplay;
  145.                         } else {
  146.                                 x = y = 0;
  147.                                 width = adjusted_mode->hdisplay;
  148.                                 height = adjusted_mode->vdisplay;
  149.                         }
  150.                 }
  151.                 break;
  152.  
  153.         case DRM_MODE_SCALE_FULLSCREEN:
  154.                 x = y = 0;
  155.                 width = adjusted_mode->hdisplay;
  156.                 height = adjusted_mode->vdisplay;
  157.                 break;
  158.  
  159.         default:
  160.                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
  161.                 return;
  162.         }
  163.  
  164. done:
  165.         pipe_config->pch_pfit.pos = (x << 16) | y;
  166.         pipe_config->pch_pfit.size = (width << 16) | height;
  167.         pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
  168. }
  169.  
  170. static void
  171. centre_horizontally(struct drm_display_mode *mode,
  172.                     int width)
  173. {
  174.         u32 border, sync_pos, blank_width, sync_width;
  175.  
  176.         /* keep the hsync and hblank widths constant */
  177.         sync_width = mode->crtc_hsync_end - mode->crtc_hsync_start;
  178.         blank_width = mode->crtc_hblank_end - mode->crtc_hblank_start;
  179.         sync_pos = (blank_width - sync_width + 1) / 2;
  180.  
  181.         border = (mode->hdisplay - width + 1) / 2;
  182.         border += border & 1; /* make the border even */
  183.  
  184.         mode->crtc_hdisplay = width;
  185.         mode->crtc_hblank_start = width + border;
  186.         mode->crtc_hblank_end = mode->crtc_hblank_start + blank_width;
  187.  
  188.         mode->crtc_hsync_start = mode->crtc_hblank_start + sync_pos;
  189.         mode->crtc_hsync_end = mode->crtc_hsync_start + sync_width;
  190. }
  191.  
  192. static void
  193. centre_vertically(struct drm_display_mode *mode,
  194.                   int height)
  195. {
  196.         u32 border, sync_pos, blank_width, sync_width;
  197.  
  198.         /* keep the vsync and vblank widths constant */
  199.         sync_width = mode->crtc_vsync_end - mode->crtc_vsync_start;
  200.         blank_width = mode->crtc_vblank_end - mode->crtc_vblank_start;
  201.         sync_pos = (blank_width - sync_width + 1) / 2;
  202.  
  203.         border = (mode->vdisplay - height + 1) / 2;
  204.  
  205.         mode->crtc_vdisplay = height;
  206.         mode->crtc_vblank_start = height + border;
  207.         mode->crtc_vblank_end = mode->crtc_vblank_start + blank_width;
  208.  
  209.         mode->crtc_vsync_start = mode->crtc_vblank_start + sync_pos;
  210.         mode->crtc_vsync_end = mode->crtc_vsync_start + sync_width;
  211. }
  212.  
  213. static inline u32 panel_fitter_scaling(u32 source, u32 target)
  214. {
  215.         /*
  216.          * Floating point operation is not supported. So the FACTOR
  217.          * is defined, which can avoid the floating point computation
  218.          * when calculating the panel ratio.
  219.          */
  220. #define ACCURACY 12
  221. #define FACTOR (1 << ACCURACY)
  222.         u32 ratio = source * FACTOR / target;
  223.         return (FACTOR * ratio + FACTOR/2) / FACTOR;
  224. }
  225.  
  226. static void i965_scale_aspect(struct intel_crtc_config *pipe_config,
  227.                               u32 *pfit_control)
  228. {
  229.         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
  230.                         u32 scaled_width = adjusted_mode->hdisplay *
  231.                 pipe_config->pipe_src_h;
  232.         u32 scaled_height = pipe_config->pipe_src_w *
  233.                                 adjusted_mode->vdisplay;
  234.  
  235.                         /* 965+ is easy, it does everything in hw */
  236.                         if (scaled_width > scaled_height)
  237.                 *pfit_control |= PFIT_ENABLE |
  238.                                         PFIT_SCALING_PILLAR;
  239.                         else if (scaled_width < scaled_height)
  240.                 *pfit_control |= PFIT_ENABLE |
  241.                                         PFIT_SCALING_LETTER;
  242.         else if (adjusted_mode->hdisplay != pipe_config->pipe_src_w)
  243.                 *pfit_control |= PFIT_ENABLE | PFIT_SCALING_AUTO;
  244. }
  245.  
  246. static void i9xx_scale_aspect(struct intel_crtc_config *pipe_config,
  247.                               u32 *pfit_control, u32 *pfit_pgm_ratios,
  248.                               u32 *border)
  249. {
  250.         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
  251.                         u32 scaled_width = adjusted_mode->hdisplay *
  252.                 pipe_config->pipe_src_h;
  253.         u32 scaled_height = pipe_config->pipe_src_w *
  254.                                 adjusted_mode->vdisplay;
  255.         u32 bits;
  256.  
  257.                         /*
  258.                          * For earlier chips we have to calculate the scaling
  259.                          * ratio by hand and program it into the
  260.                          * PFIT_PGM_RATIO register
  261.                          */
  262.                         if (scaled_width > scaled_height) { /* pillar */
  263.                                 centre_horizontally(adjusted_mode,
  264.                                                     scaled_height /
  265.                                     pipe_config->pipe_src_h);
  266.  
  267.                 *border = LVDS_BORDER_ENABLE;
  268.                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay) {
  269.                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
  270.                                                     adjusted_mode->vdisplay);
  271.  
  272.                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
  273.                                                             bits << PFIT_VERT_SCALE_SHIFT);
  274.                         *pfit_control |= (PFIT_ENABLE |
  275.                                                          VERT_INTERP_BILINEAR |
  276.                                                          HORIZ_INTERP_BILINEAR);
  277.                                 }
  278.                         } else if (scaled_width < scaled_height) { /* letter */
  279.                                 centre_vertically(adjusted_mode,
  280.                                                   scaled_width /
  281.                                   pipe_config->pipe_src_w);
  282.  
  283.                 *border = LVDS_BORDER_ENABLE;
  284.                 if (pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
  285.                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
  286.                                                     adjusted_mode->hdisplay);
  287.  
  288.                         *pfit_pgm_ratios |= (bits << PFIT_HORIZ_SCALE_SHIFT |
  289.                                                             bits << PFIT_VERT_SCALE_SHIFT);
  290.                         *pfit_control |= (PFIT_ENABLE |
  291.                                                          VERT_INTERP_BILINEAR |
  292.                                                          HORIZ_INTERP_BILINEAR);
  293.                                 }
  294.                         } else {
  295.                                 /* Aspects match, Let hw scale both directions */
  296.                 *pfit_control |= (PFIT_ENABLE |
  297.                                                  VERT_AUTO_SCALE | HORIZ_AUTO_SCALE |
  298.                                                  VERT_INTERP_BILINEAR |
  299.                                                  HORIZ_INTERP_BILINEAR);
  300.                         }
  301. }
  302.  
  303. void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
  304.                               struct intel_crtc_config *pipe_config,
  305.                               int fitting_mode)
  306. {
  307.         struct drm_device *dev = intel_crtc->base.dev;
  308.         u32 pfit_control = 0, pfit_pgm_ratios = 0, border = 0;
  309.         struct drm_display_mode *adjusted_mode;
  310.  
  311.         adjusted_mode = &pipe_config->adjusted_mode;
  312.  
  313.         /* Native modes don't need fitting */
  314.         if (adjusted_mode->hdisplay == pipe_config->pipe_src_w &&
  315.             adjusted_mode->vdisplay == pipe_config->pipe_src_h)
  316.                 goto out;
  317.  
  318.         switch (fitting_mode) {
  319.         case DRM_MODE_SCALE_CENTER:
  320.                 /*
  321.                  * For centered modes, we have to calculate border widths &
  322.                  * heights and modify the values programmed into the CRTC.
  323.                  */
  324.                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
  325.                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
  326.                 border = LVDS_BORDER_ENABLE;
  327.                 break;
  328.         case DRM_MODE_SCALE_ASPECT:
  329.                 /* Scale but preserve the aspect ratio */
  330.                 if (INTEL_INFO(dev)->gen >= 4)
  331.                         i965_scale_aspect(pipe_config, &pfit_control);
  332.                 else
  333.                         i9xx_scale_aspect(pipe_config, &pfit_control,
  334.                                           &pfit_pgm_ratios, &border);
  335.                 break;
  336.         case DRM_MODE_SCALE_FULLSCREEN:
  337.                 /*
  338.                  * Full scaling, even if it changes the aspect ratio.
  339.                  * Fortunately this is all done for us in hw.
  340.                  */
  341.                 if (pipe_config->pipe_src_h != adjusted_mode->vdisplay ||
  342.                     pipe_config->pipe_src_w != adjusted_mode->hdisplay) {
  343.                         pfit_control |= PFIT_ENABLE;
  344.                         if (INTEL_INFO(dev)->gen >= 4)
  345.                                 pfit_control |= PFIT_SCALING_AUTO;
  346.                         else
  347.                                 pfit_control |= (VERT_AUTO_SCALE |
  348.                                                  VERT_INTERP_BILINEAR |
  349.                                                  HORIZ_AUTO_SCALE |
  350.                                                  HORIZ_INTERP_BILINEAR);
  351.                 }
  352.                 break;
  353.         default:
  354.                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
  355.                 return;
  356.         }
  357.  
  358.         /* 965+ wants fuzzy fitting */
  359.         /* FIXME: handle multiple panels by failing gracefully */
  360.         if (INTEL_INFO(dev)->gen >= 4)
  361.                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
  362.                                  PFIT_FILTER_FUZZY);
  363.  
  364. out:
  365.         if ((pfit_control & PFIT_ENABLE) == 0) {
  366.                 pfit_control = 0;
  367.                 pfit_pgm_ratios = 0;
  368.         }
  369.  
  370.         /* Make sure pre-965 set dither correctly for 18bpp panels. */
  371.         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
  372.                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
  373.  
  374.         pipe_config->gmch_pfit.control = pfit_control;
  375.         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
  376.         pipe_config->gmch_pfit.lvds_border_bits = border;
  377. }
  378.  
  379. enum drm_connector_status
  380. intel_panel_detect(struct drm_device *dev)
  381. {
  382.         struct drm_i915_private *dev_priv = dev->dev_private;
  383.  
  384.         /* Assume that the BIOS does not lie through the OpRegion... */
  385.         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
  386.                 return ioread32(dev_priv->opregion.lid_state) & 0x1 ?
  387.                         connector_status_connected :
  388.                         connector_status_disconnected;
  389.         }
  390.  
  391.         switch (i915.panel_ignore_lid) {
  392.         case -2:
  393.                 return connector_status_connected;
  394.         case -1:
  395.                 return connector_status_disconnected;
  396.         default:
  397.                 return connector_status_unknown;
  398.         }
  399. }
  400.  
  401. /**
  402.  * scale - scale values from one range to another
  403.  *
  404.  * @source_val: value in range [@source_min..@source_max]
  405.  *
  406.  * Return @source_val in range [@source_min..@source_max] scaled to range
  407.  * [@target_min..@target_max].
  408.  */
  409. static uint32_t scale(uint32_t source_val,
  410.                       uint32_t source_min, uint32_t source_max,
  411.                       uint32_t target_min, uint32_t target_max)
  412. {
  413.         uint64_t target_val;
  414.  
  415.         WARN_ON(source_min > source_max);
  416.         WARN_ON(target_min > target_max);
  417.  
  418.         /* defensive */
  419.         source_val = clamp(source_val, source_min, source_max);
  420.  
  421.         /* avoid overflows */
  422.         target_val = (uint64_t)(source_val - source_min) *
  423.                 (target_max - target_min);
  424.         do_div(target_val, source_max - source_min);
  425.         target_val += target_min;
  426.  
  427.         return target_val;
  428. }
  429.  
  430. /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
  431. static inline u32 scale_user_to_hw(struct intel_connector *connector,
  432.                                    u32 user_level, u32 user_max)
  433. {
  434.         struct intel_panel *panel = &connector->panel;
  435.  
  436.         return scale(user_level, 0, user_max,
  437.                      panel->backlight.min, panel->backlight.max);
  438. }
  439.  
  440. /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
  441.  * to [hw_min..hw_max]. */
  442. static inline u32 clamp_user_to_hw(struct intel_connector *connector,
  443.                                    u32 user_level, u32 user_max)
  444. {
  445.         struct intel_panel *panel = &connector->panel;
  446.         u32 hw_level;
  447.  
  448.         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
  449.         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
  450.  
  451.         return hw_level;
  452. }
  453.  
  454. /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
  455. static inline u32 scale_hw_to_user(struct intel_connector *connector,
  456.                                    u32 hw_level, u32 user_max)
  457. {
  458.         struct intel_panel *panel = &connector->panel;
  459.  
  460.         return scale(hw_level, panel->backlight.min, panel->backlight.max,
  461.                      0, user_max);
  462. }
  463.  
  464. static u32 intel_panel_compute_brightness(struct intel_connector *connector,
  465.                                           u32 val)
  466. {
  467.         struct drm_device *dev = connector->base.dev;
  468.         struct drm_i915_private *dev_priv = dev->dev_private;
  469.         struct intel_panel *panel = &connector->panel;
  470.  
  471.         WARN_ON(panel->backlight.max == 0);
  472.  
  473.         if (i915.invert_brightness < 0)
  474.                 return val;
  475.  
  476.         if (i915.invert_brightness > 0 ||
  477.             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
  478.                 return panel->backlight.max - val;
  479.         }
  480.  
  481.         return val;
  482. }
  483.  
  484. static u32 bdw_get_backlight(struct intel_connector *connector)
  485. {
  486.         struct drm_device *dev = connector->base.dev;
  487.         struct drm_i915_private *dev_priv = dev->dev_private;
  488.  
  489.         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
  490. }
  491.  
  492. static u32 pch_get_backlight(struct intel_connector *connector)
  493. {
  494.         struct drm_device *dev = connector->base.dev;
  495.         struct drm_i915_private *dev_priv = dev->dev_private;
  496.  
  497.         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  498. }
  499.  
  500. static u32 i9xx_get_backlight(struct intel_connector *connector)
  501. {
  502.         struct drm_device *dev = connector->base.dev;
  503.         struct drm_i915_private *dev_priv = dev->dev_private;
  504.         struct intel_panel *panel = &connector->panel;
  505.         u32 val;
  506.  
  507.         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  508.         if (INTEL_INFO(dev)->gen < 4)
  509.                 val >>= 1;
  510.  
  511.         if (panel->backlight.combination_mode) {
  512.                 u8 lbpc;
  513.  
  514.                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
  515.                 val *= lbpc;
  516.         }
  517.  
  518.         return val;
  519. }
  520.  
  521. static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
  522. {
  523.         struct drm_i915_private *dev_priv = dev->dev_private;
  524.  
  525.         return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
  526. }
  527.  
  528. static u32 vlv_get_backlight(struct intel_connector *connector)
  529. {
  530.         struct drm_device *dev = connector->base.dev;
  531.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  532.  
  533.         return _vlv_get_backlight(dev, pipe);
  534. }
  535.  
  536. static u32 intel_panel_get_backlight(struct intel_connector *connector)
  537. {
  538.         struct drm_device *dev = connector->base.dev;
  539.         struct drm_i915_private *dev_priv = dev->dev_private;
  540.         u32 val;
  541.         unsigned long flags;
  542.  
  543.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  544.  
  545.         val = dev_priv->display.get_backlight(connector);
  546.         val = intel_panel_compute_brightness(connector, val);
  547.  
  548.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  549.  
  550.         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
  551.         return val;
  552. }
  553.  
  554. static void bdw_set_backlight(struct intel_connector *connector, u32 level)
  555. {
  556.         struct drm_device *dev = connector->base.dev;
  557.         struct drm_i915_private *dev_priv = dev->dev_private;
  558.         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  559.         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
  560. }
  561.  
  562. static void pch_set_backlight(struct intel_connector *connector, u32 level)
  563. {
  564.         struct drm_device *dev = connector->base.dev;
  565.         struct drm_i915_private *dev_priv = dev->dev_private;
  566.         u32 tmp;
  567.  
  568.         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  569.         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
  570. }
  571.  
  572. static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
  573. {
  574.         struct drm_device *dev = connector->base.dev;
  575.         struct drm_i915_private *dev_priv = dev->dev_private;
  576.         struct intel_panel *panel = &connector->panel;
  577.         u32 tmp, mask;
  578.  
  579.         WARN_ON(panel->backlight.max == 0);
  580.  
  581.         if (panel->backlight.combination_mode) {
  582.                 u8 lbpc;
  583.  
  584.                 lbpc = level * 0xfe / panel->backlight.max + 1;
  585.                 level /= lbpc;
  586.                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
  587.         }
  588.  
  589.         if (IS_GEN4(dev)) {
  590.                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
  591.         } else {
  592.                 level <<= 1;
  593.                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
  594.         }
  595.  
  596.         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
  597.         I915_WRITE(BLC_PWM_CTL, tmp | level);
  598. }
  599.  
  600. static void vlv_set_backlight(struct intel_connector *connector, u32 level)
  601. {
  602.         struct drm_device *dev = connector->base.dev;
  603.         struct drm_i915_private *dev_priv = dev->dev_private;
  604.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  605.         u32 tmp;
  606.  
  607.         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  608.         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
  609. }
  610.  
  611. static void
  612. intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
  613. {
  614.         struct drm_device *dev = connector->base.dev;
  615.         struct drm_i915_private *dev_priv = dev->dev_private;
  616.  
  617.         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
  618.  
  619.         level = intel_panel_compute_brightness(connector, level);
  620.         dev_priv->display.set_backlight(connector, level);
  621. }
  622.  
  623. /* set backlight brightness to level in range [0..max], scaling wrt hw min */
  624. static void intel_panel_set_backlight(struct intel_connector *connector,
  625.                                       u32 user_level, u32 user_max)
  626. {
  627.         struct drm_device *dev = connector->base.dev;
  628.         struct drm_i915_private *dev_priv = dev->dev_private;
  629.         struct intel_panel *panel = &connector->panel;
  630.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  631.         u32 hw_level;
  632.         unsigned long flags;
  633.  
  634.         if (!panel->backlight.present || pipe == INVALID_PIPE)
  635.                 return;
  636.  
  637.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  638.  
  639.         WARN_ON(panel->backlight.max == 0);
  640.  
  641.         hw_level = scale_user_to_hw(connector, user_level, user_max);
  642.         panel->backlight.level = hw_level;
  643.  
  644.         if (panel->backlight.enabled)
  645.                 intel_panel_actually_set_backlight(connector, hw_level);
  646.  
  647.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  648. }
  649.  
  650. /* set backlight brightness to level in range [0..max], assuming hw min is
  651.  * respected.
  652.  */
  653. void intel_panel_set_backlight_acpi(struct intel_connector *connector,
  654.                                     u32 user_level, u32 user_max)
  655. {
  656.         struct drm_device *dev = connector->base.dev;
  657.         struct drm_i915_private *dev_priv = dev->dev_private;
  658.         struct intel_panel *panel = &connector->panel;
  659.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  660.         u32 hw_level;
  661.         unsigned long flags;
  662.  
  663.         if (!panel->backlight.present || pipe == INVALID_PIPE)
  664.                 return;
  665.  
  666.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  667.  
  668.         WARN_ON(panel->backlight.max == 0);
  669.  
  670.         hw_level = clamp_user_to_hw(connector, user_level, user_max);
  671.         panel->backlight.level = hw_level;
  672.  
  673.  
  674.         if (panel->backlight.enabled)
  675.                 intel_panel_actually_set_backlight(connector, hw_level);
  676.  
  677.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  678. }
  679.  
  680. static void pch_disable_backlight(struct intel_connector *connector)
  681. {
  682.         struct drm_device *dev = connector->base.dev;
  683.         struct drm_i915_private *dev_priv = dev->dev_private;
  684.         u32 tmp;
  685.  
  686.         intel_panel_actually_set_backlight(connector, 0);
  687.  
  688.         tmp = I915_READ(BLC_PWM_CPU_CTL2);
  689.         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
  690.  
  691.         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  692.         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
  693. }
  694.  
  695. static void i9xx_disable_backlight(struct intel_connector *connector)
  696. {
  697.         intel_panel_actually_set_backlight(connector, 0);
  698. }
  699.  
  700. static void i965_disable_backlight(struct intel_connector *connector)
  701. {
  702.         struct drm_device *dev = connector->base.dev;
  703.         struct drm_i915_private *dev_priv = dev->dev_private;
  704.         u32 tmp;
  705.  
  706.         intel_panel_actually_set_backlight(connector, 0);
  707.  
  708.         tmp = I915_READ(BLC_PWM_CTL2);
  709.         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
  710. }
  711.  
  712. static void vlv_disable_backlight(struct intel_connector *connector)
  713. {
  714.         struct drm_device *dev = connector->base.dev;
  715.         struct drm_i915_private *dev_priv = dev->dev_private;
  716.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  717.         u32 tmp;
  718.  
  719.         intel_panel_actually_set_backlight(connector, 0);
  720.  
  721.         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
  722.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
  723. }
  724.  
  725. void intel_panel_disable_backlight(struct intel_connector *connector)
  726. {
  727.         struct drm_device *dev = connector->base.dev;
  728.         struct drm_i915_private *dev_priv = dev->dev_private;
  729.         struct intel_panel *panel = &connector->panel;
  730.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  731.         unsigned long flags;
  732.  
  733.         if (!panel->backlight.present || pipe == INVALID_PIPE)
  734.                 return;
  735.  
  736.         /*
  737.          * Do not disable backlight on the vgaswitcheroo path. When switching
  738.          * away from i915, the other client may depend on i915 to handle the
  739.          * backlight. This will leave the backlight on unnecessarily when
  740.          * another client is not activated.
  741.          */
  742.         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
  743.                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
  744.                 return;
  745.         }
  746.  
  747.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  748.  
  749.         panel->backlight.enabled = false;
  750.         dev_priv->display.disable_backlight(connector);
  751.  
  752.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  753. }
  754.  
  755. static void bdw_enable_backlight(struct intel_connector *connector)
  756. {
  757.         struct drm_device *dev = connector->base.dev;
  758.         struct drm_i915_private *dev_priv = dev->dev_private;
  759.         struct intel_panel *panel = &connector->panel;
  760.         u32 pch_ctl1, pch_ctl2;
  761.  
  762.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  763.         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
  764.                 DRM_DEBUG_KMS("pch backlight already enabled\n");
  765.                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
  766.                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  767.         }
  768.  
  769.         pch_ctl2 = panel->backlight.max << 16;
  770.         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
  771.  
  772.         pch_ctl1 = 0;
  773.         if (panel->backlight.active_low_pwm)
  774.                 pch_ctl1 |= BLM_PCH_POLARITY;
  775.  
  776.         /* BDW always uses the pch pwm controls. */
  777.         pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
  778.  
  779.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  780.         POSTING_READ(BLC_PWM_PCH_CTL1);
  781.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
  782.  
  783.         /* This won't stick until the above enable. */
  784.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  785. }
  786.  
  787. static void pch_enable_backlight(struct intel_connector *connector)
  788. {
  789.         struct drm_device *dev = connector->base.dev;
  790.         struct drm_i915_private *dev_priv = dev->dev_private;
  791.         struct intel_panel *panel = &connector->panel;
  792.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  793.         enum transcoder cpu_transcoder =
  794.                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
  795.         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
  796.  
  797.         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
  798.         if (cpu_ctl2 & BLM_PWM_ENABLE) {
  799.                 WARN(1, "cpu backlight already enabled\n");
  800.                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
  801.                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
  802.         }
  803.  
  804.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  805.         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
  806.                 DRM_DEBUG_KMS("pch backlight already enabled\n");
  807.                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
  808.                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  809.         }
  810.  
  811.         if (cpu_transcoder == TRANSCODER_EDP)
  812.                 cpu_ctl2 = BLM_TRANSCODER_EDP;
  813.         else
  814.                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
  815.         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
  816.         POSTING_READ(BLC_PWM_CPU_CTL2);
  817.         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
  818.  
  819.         /* This won't stick until the above enable. */
  820.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  821.  
  822.         pch_ctl2 = panel->backlight.max << 16;
  823.         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
  824.  
  825.         pch_ctl1 = 0;
  826.         if (panel->backlight.active_low_pwm)
  827.                 pch_ctl1 |= BLM_PCH_POLARITY;
  828.  
  829.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  830.         POSTING_READ(BLC_PWM_PCH_CTL1);
  831.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
  832. }
  833.  
  834. static void i9xx_enable_backlight(struct intel_connector *connector)
  835. {
  836.         struct drm_device *dev = connector->base.dev;
  837.         struct drm_i915_private *dev_priv = dev->dev_private;
  838.         struct intel_panel *panel = &connector->panel;
  839.         u32 ctl, freq;
  840.  
  841.         ctl = I915_READ(BLC_PWM_CTL);
  842.         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
  843.                 WARN(1, "backlight already enabled\n");
  844.                 I915_WRITE(BLC_PWM_CTL, 0);
  845.         }
  846.  
  847.         freq = panel->backlight.max;
  848.         if (panel->backlight.combination_mode)
  849.                 freq /= 0xff;
  850.  
  851.         ctl = freq << 17;
  852.         if (panel->backlight.combination_mode)
  853.                 ctl |= BLM_LEGACY_MODE;
  854.         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
  855.                 ctl |= BLM_POLARITY_PNV;
  856.  
  857.         I915_WRITE(BLC_PWM_CTL, ctl);
  858.         POSTING_READ(BLC_PWM_CTL);
  859.  
  860.         /* XXX: combine this into above write? */
  861.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  862. }
  863.  
  864. static void i965_enable_backlight(struct intel_connector *connector)
  865. {
  866.         struct drm_device *dev = connector->base.dev;
  867.         struct drm_i915_private *dev_priv = dev->dev_private;
  868.         struct intel_panel *panel = &connector->panel;
  869.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  870.         u32 ctl, ctl2, freq;
  871.  
  872.         ctl2 = I915_READ(BLC_PWM_CTL2);
  873.         if (ctl2 & BLM_PWM_ENABLE) {
  874.                 WARN(1, "backlight already enabled\n");
  875.                 ctl2 &= ~BLM_PWM_ENABLE;
  876.                 I915_WRITE(BLC_PWM_CTL2, ctl2);
  877.                 }
  878.  
  879.         freq = panel->backlight.max;
  880.         if (panel->backlight.combination_mode)
  881.                 freq /= 0xff;
  882.  
  883.         ctl = freq << 16;
  884.         I915_WRITE(BLC_PWM_CTL, ctl);
  885.  
  886.         ctl2 = BLM_PIPE(pipe);
  887.         if (panel->backlight.combination_mode)
  888.                 ctl2 |= BLM_COMBINATION_MODE;
  889.         if (panel->backlight.active_low_pwm)
  890.                 ctl2 |= BLM_POLARITY_I965;
  891.         I915_WRITE(BLC_PWM_CTL2, ctl2);
  892.         POSTING_READ(BLC_PWM_CTL2);
  893.         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
  894.  
  895.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  896. }
  897.  
  898. static void vlv_enable_backlight(struct intel_connector *connector)
  899. {
  900.         struct drm_device *dev = connector->base.dev;
  901.         struct drm_i915_private *dev_priv = dev->dev_private;
  902.         struct intel_panel *panel = &connector->panel;
  903.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  904.         u32 ctl, ctl2;
  905.  
  906.         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
  907.         if (ctl2 & BLM_PWM_ENABLE) {
  908.                 WARN(1, "backlight already enabled\n");
  909.                 ctl2 &= ~BLM_PWM_ENABLE;
  910.                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
  911.         }
  912.  
  913.         ctl = panel->backlight.max << 16;
  914.         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
  915.  
  916.         /* XXX: combine this into above write? */
  917.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  918.  
  919.         ctl2 = 0;
  920.         if (panel->backlight.active_low_pwm)
  921.                 ctl2 |= BLM_POLARITY_I965;
  922.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
  923.         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
  924.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
  925. }
  926.  
  927. void intel_panel_enable_backlight(struct intel_connector *connector)
  928. {
  929.         struct drm_device *dev = connector->base.dev;
  930.         struct drm_i915_private *dev_priv = dev->dev_private;
  931.         struct intel_panel *panel = &connector->panel;
  932.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  933.         unsigned long flags;
  934.  
  935.         if (!panel->backlight.present || pipe == INVALID_PIPE)
  936.                 return;
  937.  
  938.         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
  939.  
  940.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  941.  
  942.         WARN_ON(panel->backlight.max == 0);
  943.  
  944.         if (panel->backlight.level == 0) {
  945.                 panel->backlight.level = panel->backlight.max;
  946.         }
  947.  
  948.         dev_priv->display.enable_backlight(connector);
  949.         panel->backlight.enabled = true;
  950.  
  951.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  952. }
  953.  
  954. #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
  955. static int intel_backlight_device_update_status(struct backlight_device *bd)
  956. {
  957.         struct intel_connector *connector = bl_get_data(bd);
  958.         struct drm_device *dev = connector->base.dev;
  959.  
  960.         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
  961.         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
  962.                       bd->props.brightness, bd->props.max_brightness);
  963.         intel_panel_set_backlight(connector, bd->props.brightness,
  964.                                   bd->props.max_brightness);
  965.         drm_modeset_unlock(&dev->mode_config.connection_mutex);
  966.         return 0;
  967. }
  968.  
  969. static int intel_backlight_device_get_brightness(struct backlight_device *bd)
  970. {
  971.         struct intel_connector *connector = bl_get_data(bd);
  972.         struct drm_device *dev = connector->base.dev;
  973.         struct drm_i915_private *dev_priv = dev->dev_private;
  974.         u32 hw_level;
  975.         int ret;
  976.  
  977.         intel_runtime_pm_get(dev_priv);
  978.         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
  979.  
  980.         hw_level = intel_panel_get_backlight(connector);
  981.         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
  982.  
  983.         drm_modeset_unlock(&dev->mode_config.connection_mutex);
  984.         intel_runtime_pm_put(dev_priv);
  985.  
  986.         return ret;
  987. }
  988.  
  989. static const struct backlight_ops intel_backlight_device_ops = {
  990.         .update_status = intel_backlight_device_update_status,
  991.         .get_brightness = intel_backlight_device_get_brightness,
  992. };
  993.  
  994. static int intel_backlight_device_register(struct intel_connector *connector)
  995. {
  996.         struct intel_panel *panel = &connector->panel;
  997.         struct backlight_properties props;
  998.  
  999.         if (WARN_ON(panel->backlight.device))
  1000.                 return -ENODEV;
  1001.  
  1002.         WARN_ON(panel->backlight.max == 0);
  1003.  
  1004.         memset(&props, 0, sizeof(props));
  1005.         props.type = BACKLIGHT_RAW;
  1006.  
  1007.         /*
  1008.          * Note: Everything should work even if the backlight device max
  1009.          * presented to the userspace is arbitrarily chosen.
  1010.          */
  1011.         props.max_brightness = panel->backlight.max;
  1012.         props.brightness = scale_hw_to_user(connector,
  1013.                                             panel->backlight.level,
  1014.                                             props.max_brightness);
  1015.  
  1016.         /*
  1017.          * Note: using the same name independent of the connector prevents
  1018.          * registration of multiple backlight devices in the driver.
  1019.          */
  1020.         panel->backlight.device =
  1021.                 backlight_device_register("intel_backlight",
  1022.                                           connector->base.kdev,
  1023.                                           connector,
  1024.                                           &intel_backlight_device_ops, &props);
  1025.  
  1026.         if (IS_ERR(panel->backlight.device)) {
  1027.                 DRM_ERROR("Failed to register backlight: %ld\n",
  1028.                           PTR_ERR(panel->backlight.device));
  1029.                 panel->backlight.device = NULL;
  1030.                 return -ENODEV;
  1031.         }
  1032.         return 0;
  1033. }
  1034.  
  1035. static void intel_backlight_device_unregister(struct intel_connector *connector)
  1036. {
  1037.         struct intel_panel *panel = &connector->panel;
  1038.  
  1039.         if (panel->backlight.device) {
  1040.                 backlight_device_unregister(panel->backlight.device);
  1041.                 panel->backlight.device = NULL;
  1042.         }
  1043. }
  1044. #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
  1045. static int intel_backlight_device_register(struct intel_connector *connector)
  1046. {
  1047.         return 0;
  1048. }
  1049. static void intel_backlight_device_unregister(struct intel_connector *connector)
  1050. {
  1051. }
  1052. #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
  1053.  
  1054. /*
  1055.  * Note: The setup hooks can't assume pipe is set!
  1056.  *
  1057.  * XXX: Query mode clock or hardware clock and program PWM modulation frequency
  1058.  * appropriately when it's 0. Use VBT and/or sane defaults.
  1059.  */
  1060. static u32 get_backlight_min_vbt(struct intel_connector *connector)
  1061. {
  1062.         struct drm_device *dev = connector->base.dev;
  1063.         struct drm_i915_private *dev_priv = dev->dev_private;
  1064.         struct intel_panel *panel = &connector->panel;
  1065.  
  1066.         WARN_ON(panel->backlight.max == 0);
  1067.  
  1068.         /* vbt value is a coefficient in range [0..255] */
  1069.         return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
  1070.                      0, panel->backlight.max);
  1071. }
  1072.  
  1073. static int bdw_setup_backlight(struct intel_connector *connector)
  1074. {
  1075.         struct drm_device *dev = connector->base.dev;
  1076.         struct drm_i915_private *dev_priv = dev->dev_private;
  1077.         struct intel_panel *panel = &connector->panel;
  1078.         u32 pch_ctl1, pch_ctl2, val;
  1079.  
  1080.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  1081.         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
  1082.  
  1083.         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
  1084.         panel->backlight.max = pch_ctl2 >> 16;
  1085.         if (!panel->backlight.max)
  1086.                 return -ENODEV;
  1087.  
  1088.         panel->backlight.min = get_backlight_min_vbt(connector);
  1089.  
  1090.         val = bdw_get_backlight(connector);
  1091.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1092.  
  1093.         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
  1094.                 panel->backlight.level != 0;
  1095.  
  1096.         return 0;
  1097. }
  1098.  
  1099. static int pch_setup_backlight(struct intel_connector *connector)
  1100. {
  1101.         struct drm_device *dev = connector->base.dev;
  1102.         struct drm_i915_private *dev_priv = dev->dev_private;
  1103.         struct intel_panel *panel = &connector->panel;
  1104.         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
  1105.  
  1106.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  1107.         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
  1108.  
  1109.         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
  1110.         panel->backlight.max = pch_ctl2 >> 16;
  1111.         if (!panel->backlight.max)
  1112.                 return -ENODEV;
  1113.  
  1114.         panel->backlight.min = get_backlight_min_vbt(connector);
  1115.  
  1116.         val = pch_get_backlight(connector);
  1117.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1118.  
  1119.         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
  1120.         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
  1121.                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
  1122.  
  1123.         return 0;
  1124. }
  1125.  
  1126. static int i9xx_setup_backlight(struct intel_connector *connector)
  1127. {
  1128.         struct drm_device *dev = connector->base.dev;
  1129.         struct drm_i915_private *dev_priv = dev->dev_private;
  1130.         struct intel_panel *panel = &connector->panel;
  1131.         u32 ctl, val;
  1132.  
  1133.         ctl = I915_READ(BLC_PWM_CTL);
  1134.  
  1135.         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
  1136.                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
  1137.  
  1138.         if (IS_PINEVIEW(dev))
  1139.                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
  1140.  
  1141.         panel->backlight.max = ctl >> 17;
  1142.         if (panel->backlight.combination_mode)
  1143.                 panel->backlight.max *= 0xff;
  1144.  
  1145.         if (!panel->backlight.max)
  1146.                 return -ENODEV;
  1147.  
  1148.         panel->backlight.min = get_backlight_min_vbt(connector);
  1149.  
  1150.         val = i9xx_get_backlight(connector);
  1151.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1152.  
  1153.         panel->backlight.enabled = panel->backlight.level != 0;
  1154.  
  1155.         return 0;
  1156. }
  1157.  
  1158. static int i965_setup_backlight(struct intel_connector *connector)
  1159. {
  1160.         struct drm_device *dev = connector->base.dev;
  1161.         struct drm_i915_private *dev_priv = dev->dev_private;
  1162.         struct intel_panel *panel = &connector->panel;
  1163.         u32 ctl, ctl2, val;
  1164.  
  1165.         ctl2 = I915_READ(BLC_PWM_CTL2);
  1166.         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
  1167.         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
  1168.  
  1169.         ctl = I915_READ(BLC_PWM_CTL);
  1170.         panel->backlight.max = ctl >> 16;
  1171.         if (panel->backlight.combination_mode)
  1172.                 panel->backlight.max *= 0xff;
  1173.  
  1174.         if (!panel->backlight.max)
  1175.                 return -ENODEV;
  1176.  
  1177.         panel->backlight.min = get_backlight_min_vbt(connector);
  1178.  
  1179.         val = i9xx_get_backlight(connector);
  1180.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1181.  
  1182.         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
  1183.                 panel->backlight.level != 0;
  1184.  
  1185.         return 0;
  1186. }
  1187.  
  1188. static int vlv_setup_backlight(struct intel_connector *connector)
  1189. {
  1190.         struct drm_device *dev = connector->base.dev;
  1191.         struct drm_i915_private *dev_priv = dev->dev_private;
  1192.         struct intel_panel *panel = &connector->panel;
  1193.         enum pipe pipe;
  1194.         u32 ctl, ctl2, val;
  1195.  
  1196.         for_each_pipe(pipe) {
  1197.                 u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
  1198.  
  1199.                 /* Skip if the modulation freq is already set */
  1200.                 if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
  1201.                         continue;
  1202.  
  1203.                 cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
  1204.                 I915_WRITE(VLV_BLC_PWM_CTL(pipe), (0xf42 << 16) |
  1205.                            cur_val);
  1206.         }
  1207.  
  1208.         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
  1209.         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
  1210.  
  1211.         ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
  1212.         panel->backlight.max = ctl >> 16;
  1213.         if (!panel->backlight.max)
  1214.                 return -ENODEV;
  1215.  
  1216.         panel->backlight.min = get_backlight_min_vbt(connector);
  1217.  
  1218.         val = _vlv_get_backlight(dev, PIPE_A);
  1219.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1220.  
  1221.         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
  1222.                 panel->backlight.level != 0;
  1223.  
  1224.         return 0;
  1225. }
  1226.  
  1227. int intel_panel_setup_backlight(struct drm_connector *connector)
  1228. {
  1229.         struct drm_device *dev = connector->dev;
  1230.         struct drm_i915_private *dev_priv = dev->dev_private;
  1231.         struct intel_connector *intel_connector = to_intel_connector(connector);
  1232.         struct intel_panel *panel = &intel_connector->panel;
  1233.         unsigned long flags;
  1234.         int ret;
  1235.  
  1236.         if (!dev_priv->vbt.backlight.present) {
  1237.                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
  1238.                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
  1239.                 } else {
  1240.                         DRM_DEBUG_KMS("no backlight present per VBT\n");
  1241.                 return 0;
  1242.         }
  1243.         }
  1244.  
  1245.         /* set level and max in panel struct */
  1246.         spin_lock_irqsave(&dev_priv->backlight_lock, flags);
  1247.         ret = dev_priv->display.setup_backlight(intel_connector);
  1248.         spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
  1249.  
  1250.         if (ret) {
  1251.                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
  1252.                               connector->name);
  1253.                 return ret;
  1254.         }
  1255.  
  1256.         intel_backlight_device_register(intel_connector);
  1257.  
  1258.         panel->backlight.present = true;
  1259.  
  1260.         DRM_DEBUG_KMS("backlight initialized, %s, brightness %u/%u, "
  1261.                       "sysfs interface %sregistered\n",
  1262.                       panel->backlight.enabled ? "enabled" : "disabled",
  1263.                       panel->backlight.level, panel->backlight.max,
  1264.                       panel->backlight.device ? "" : "not ");
  1265.  
  1266.         return 0;
  1267. }
  1268.  
  1269. void intel_panel_destroy_backlight(struct drm_connector *connector)
  1270. {
  1271.         struct intel_connector *intel_connector = to_intel_connector(connector);
  1272.         struct intel_panel *panel = &intel_connector->panel;
  1273.  
  1274.         panel->backlight.present = false;
  1275.         intel_backlight_device_unregister(intel_connector);
  1276. }
  1277.  
  1278. /* Set up chip specific backlight functions */
  1279. void intel_panel_init_backlight_funcs(struct drm_device *dev)
  1280. {
  1281.         struct drm_i915_private *dev_priv = dev->dev_private;
  1282.  
  1283.         if (IS_BROADWELL(dev)) {
  1284.                 dev_priv->display.setup_backlight = bdw_setup_backlight;
  1285.                 dev_priv->display.enable_backlight = bdw_enable_backlight;
  1286.                 dev_priv->display.disable_backlight = pch_disable_backlight;
  1287.                 dev_priv->display.set_backlight = bdw_set_backlight;
  1288.                 dev_priv->display.get_backlight = bdw_get_backlight;
  1289.         } else if (HAS_PCH_SPLIT(dev)) {
  1290.                 dev_priv->display.setup_backlight = pch_setup_backlight;
  1291.                 dev_priv->display.enable_backlight = pch_enable_backlight;
  1292.                 dev_priv->display.disable_backlight = pch_disable_backlight;
  1293.                 dev_priv->display.set_backlight = pch_set_backlight;
  1294.                 dev_priv->display.get_backlight = pch_get_backlight;
  1295.         } else if (IS_VALLEYVIEW(dev)) {
  1296.                 dev_priv->display.setup_backlight = vlv_setup_backlight;
  1297.                 dev_priv->display.enable_backlight = vlv_enable_backlight;
  1298.                 dev_priv->display.disable_backlight = vlv_disable_backlight;
  1299.                 dev_priv->display.set_backlight = vlv_set_backlight;
  1300.                 dev_priv->display.get_backlight = vlv_get_backlight;
  1301.         } else if (IS_GEN4(dev)) {
  1302.                 dev_priv->display.setup_backlight = i965_setup_backlight;
  1303.                 dev_priv->display.enable_backlight = i965_enable_backlight;
  1304.                 dev_priv->display.disable_backlight = i965_disable_backlight;
  1305.                 dev_priv->display.set_backlight = i9xx_set_backlight;
  1306.                 dev_priv->display.get_backlight = i9xx_get_backlight;
  1307.         } else {
  1308.                 dev_priv->display.setup_backlight = i9xx_setup_backlight;
  1309.                 dev_priv->display.enable_backlight = i9xx_enable_backlight;
  1310.                 dev_priv->display.disable_backlight = i9xx_disable_backlight;
  1311.                 dev_priv->display.set_backlight = i9xx_set_backlight;
  1312.                 dev_priv->display.get_backlight = i9xx_get_backlight;
  1313.         }
  1314. }
  1315.  
  1316. int intel_panel_init(struct intel_panel *panel,
  1317.                      struct drm_display_mode *fixed_mode,
  1318.                      struct drm_display_mode *downclock_mode)
  1319. {
  1320.         panel->fixed_mode = fixed_mode;
  1321.         panel->downclock_mode = downclock_mode;
  1322.  
  1323.         return 0;
  1324. }
  1325.  
  1326. void intel_panel_fini(struct intel_panel *panel)
  1327. {
  1328.         struct intel_connector *intel_connector =
  1329.                 container_of(panel, struct intel_connector, panel);
  1330.  
  1331.         if (panel->fixed_mode)
  1332.                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
  1333.  
  1334.         if (panel->downclock_mode)
  1335.                 drm_mode_destroy(intel_connector->base.dev,
  1336.                                 panel->downclock_mode);
  1337. }
  1338.