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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/kernel.h>
  34. #include <linux/moduleparam.h>
  35. #include <linux/pwm.h>
  36. #include "intel_drv.h"
  37.  
  38. #define CRC_PMIC_PWM_PERIOD_NS  21333
  39.  
  40. void
  41. intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
  42.                        struct drm_display_mode *adjusted_mode)
  43. {
  44.         drm_mode_copy(adjusted_mode, fixed_mode);
  45.  
  46.         drm_mode_set_crtcinfo(adjusted_mode, 0);
  47. }
  48.  
  49. /**
  50.  * intel_find_panel_downclock - find the reduced downclock for LVDS in EDID
  51.  * @dev: drm device
  52.  * @fixed_mode : panel native mode
  53.  * @connector: LVDS/eDP connector
  54.  *
  55.  * Return downclock_avail
  56.  * Find the reduced downclock for LVDS/eDP in EDID.
  57.  */
  58. struct drm_display_mode *
  59. intel_find_panel_downclock(struct drm_device *dev,
  60.                         struct drm_display_mode *fixed_mode,
  61.                         struct drm_connector *connector)
  62. {
  63.         struct drm_display_mode *scan, *tmp_mode;
  64.         int temp_downclock;
  65.  
  66.         temp_downclock = fixed_mode->clock;
  67.         tmp_mode = NULL;
  68.  
  69.         list_for_each_entry(scan, &connector->probed_modes, head) {
  70.                 /*
  71.                  * If one mode has the same resolution with the fixed_panel
  72.                  * mode while they have the different refresh rate, it means
  73.                  * that the reduced downclock is found. In such
  74.                  * case we can set the different FPx0/1 to dynamically select
  75.                  * between low and high frequency.
  76.                  */
  77.                 if (scan->hdisplay == fixed_mode->hdisplay &&
  78.                     scan->hsync_start == fixed_mode->hsync_start &&
  79.                     scan->hsync_end == fixed_mode->hsync_end &&
  80.                     scan->htotal == fixed_mode->htotal &&
  81.                     scan->vdisplay == fixed_mode->vdisplay &&
  82.                     scan->vsync_start == fixed_mode->vsync_start &&
  83.                     scan->vsync_end == fixed_mode->vsync_end &&
  84.                     scan->vtotal == fixed_mode->vtotal) {
  85.                         if (scan->clock < temp_downclock) {
  86.                                 /*
  87.                                  * The downclock is already found. But we
  88.                                  * expect to find the lower downclock.
  89.                                  */
  90.                                 temp_downclock = scan->clock;
  91.                                 tmp_mode = scan;
  92.                         }
  93.                 }
  94.         }
  95.  
  96.         if (temp_downclock < fixed_mode->clock)
  97.                 return drm_mode_duplicate(dev, tmp_mode);
  98.         else
  99.                 return NULL;
  100. }
  101.  
  102. /* adjusted_mode has been preset to be the panel's fixed mode */
  103. void
  104. intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  105.                         struct intel_crtc_state *pipe_config,
  106.                         int fitting_mode)
  107. {
  108.         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  109.         int x = 0, y = 0, width = 0, height = 0;
  110.  
  111.         /* Native modes don't need fitting */
  112.         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
  113.             adjusted_mode->crtc_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->crtc_hdisplay - width + 1)/2;
  121.                 y = (adjusted_mode->crtc_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->crtc_hdisplay
  128.                                 * pipe_config->pipe_src_h;
  129.                         u32 scaled_height = pipe_config->pipe_src_w
  130.                                 * adjusted_mode->crtc_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->crtc_hdisplay - width + 1) / 2;
  136.                                 y = 0;
  137.                                 height = adjusted_mode->crtc_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->crtc_vdisplay - height + 1) / 2;
  143.                                 x = 0;
  144.                                 width = adjusted_mode->crtc_hdisplay;
  145.                         } else {
  146.                                 x = y = 0;
  147.                                 width = adjusted_mode->crtc_hdisplay;
  148.                                 height = adjusted_mode->crtc_vdisplay;
  149.                         }
  150.                 }
  151.                 break;
  152.  
  153.         case DRM_MODE_SCALE_FULLSCREEN:
  154.                 x = y = 0;
  155.                 width = adjusted_mode->crtc_hdisplay;
  156.                 height = adjusted_mode->crtc_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 *adjusted_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 = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
  178.         blank_width = adjusted_mode->crtc_hblank_end - adjusted_mode->crtc_hblank_start;
  179.         sync_pos = (blank_width - sync_width + 1) / 2;
  180.  
  181.         border = (adjusted_mode->crtc_hdisplay - width + 1) / 2;
  182.         border += border & 1; /* make the border even */
  183.  
  184.         adjusted_mode->crtc_hdisplay = width;
  185.         adjusted_mode->crtc_hblank_start = width + border;
  186.         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_start + blank_width;
  187.  
  188.         adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hblank_start + sync_pos;
  189.         adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + sync_width;
  190. }
  191.  
  192. static void
  193. centre_vertically(struct drm_display_mode *adjusted_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 = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
  200.         blank_width = adjusted_mode->crtc_vblank_end - adjusted_mode->crtc_vblank_start;
  201.         sync_pos = (blank_width - sync_width + 1) / 2;
  202.  
  203.         border = (adjusted_mode->crtc_vdisplay - height + 1) / 2;
  204.  
  205.         adjusted_mode->crtc_vdisplay = height;
  206.         adjusted_mode->crtc_vblank_start = height + border;
  207.         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vblank_start + blank_width;
  208.  
  209.         adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vblank_start + sync_pos;
  210.         adjusted_mode->crtc_vsync_end = adjusted_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_state *pipe_config,
  227.                               u32 *pfit_control)
  228. {
  229.         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  230.         u32 scaled_width = adjusted_mode->crtc_hdisplay *
  231.                 pipe_config->pipe_src_h;
  232.         u32 scaled_height = pipe_config->pipe_src_w *
  233.                 adjusted_mode->crtc_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->crtc_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_state *pipe_config,
  247.                               u32 *pfit_control, u32 *pfit_pgm_ratios,
  248.                               u32 *border)
  249. {
  250.         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
  251.         u32 scaled_width = adjusted_mode->crtc_hdisplay *
  252.                 pipe_config->pipe_src_h;
  253.         u32 scaled_height = pipe_config->pipe_src_w *
  254.                 adjusted_mode->crtc_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->crtc_vdisplay) {
  269.                         bits = panel_fitter_scaling(pipe_config->pipe_src_h,
  270.                                                     adjusted_mode->crtc_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->crtc_hdisplay) {
  285.                         bits = panel_fitter_scaling(pipe_config->pipe_src_w,
  286.                                                     adjusted_mode->crtc_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_state *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 = &pipe_config->base.adjusted_mode;
  310.  
  311.         /* Native modes don't need fitting */
  312.         if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
  313.             adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
  314.                 goto out;
  315.  
  316.         switch (fitting_mode) {
  317.         case DRM_MODE_SCALE_CENTER:
  318.                 /*
  319.                  * For centered modes, we have to calculate border widths &
  320.                  * heights and modify the values programmed into the CRTC.
  321.                  */
  322.                 centre_horizontally(adjusted_mode, pipe_config->pipe_src_w);
  323.                 centre_vertically(adjusted_mode, pipe_config->pipe_src_h);
  324.                 border = LVDS_BORDER_ENABLE;
  325.                 break;
  326.         case DRM_MODE_SCALE_ASPECT:
  327.                 /* Scale but preserve the aspect ratio */
  328.                 if (INTEL_INFO(dev)->gen >= 4)
  329.                         i965_scale_aspect(pipe_config, &pfit_control);
  330.                 else
  331.                         i9xx_scale_aspect(pipe_config, &pfit_control,
  332.                                           &pfit_pgm_ratios, &border);
  333.                 break;
  334.         case DRM_MODE_SCALE_FULLSCREEN:
  335.                 /*
  336.                  * Full scaling, even if it changes the aspect ratio.
  337.                  * Fortunately this is all done for us in hw.
  338.                  */
  339.                 if (pipe_config->pipe_src_h != adjusted_mode->crtc_vdisplay ||
  340.                     pipe_config->pipe_src_w != adjusted_mode->crtc_hdisplay) {
  341.                         pfit_control |= PFIT_ENABLE;
  342.                         if (INTEL_INFO(dev)->gen >= 4)
  343.                                 pfit_control |= PFIT_SCALING_AUTO;
  344.                         else
  345.                                 pfit_control |= (VERT_AUTO_SCALE |
  346.                                                  VERT_INTERP_BILINEAR |
  347.                                                  HORIZ_AUTO_SCALE |
  348.                                                  HORIZ_INTERP_BILINEAR);
  349.                 }
  350.                 break;
  351.         default:
  352.                 WARN(1, "bad panel fit mode: %d\n", fitting_mode);
  353.                 return;
  354.         }
  355.  
  356.         /* 965+ wants fuzzy fitting */
  357.         /* FIXME: handle multiple panels by failing gracefully */
  358.         if (INTEL_INFO(dev)->gen >= 4)
  359.                 pfit_control |= ((intel_crtc->pipe << PFIT_PIPE_SHIFT) |
  360.                                  PFIT_FILTER_FUZZY);
  361.  
  362. out:
  363.         if ((pfit_control & PFIT_ENABLE) == 0) {
  364.                 pfit_control = 0;
  365.                 pfit_pgm_ratios = 0;
  366.         }
  367.  
  368.         /* Make sure pre-965 set dither correctly for 18bpp panels. */
  369.         if (INTEL_INFO(dev)->gen < 4 && pipe_config->pipe_bpp == 18)
  370.                 pfit_control |= PANEL_8TO6_DITHER_ENABLE;
  371.  
  372.         pipe_config->gmch_pfit.control = pfit_control;
  373.         pipe_config->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
  374.         pipe_config->gmch_pfit.lvds_border_bits = border;
  375. }
  376.  
  377. enum drm_connector_status
  378. intel_panel_detect(struct drm_device *dev)
  379. {
  380.         struct drm_i915_private *dev_priv = dev->dev_private;
  381.  
  382.         /* Assume that the BIOS does not lie through the OpRegion... */
  383.         if (!i915.panel_ignore_lid && dev_priv->opregion.lid_state) {
  384.                 return *dev_priv->opregion.lid_state & 0x1 ?
  385.                         connector_status_connected :
  386.                         connector_status_disconnected;
  387.         }
  388.  
  389.         switch (i915.panel_ignore_lid) {
  390.         case -2:
  391.                 return connector_status_connected;
  392.         case -1:
  393.                 return connector_status_disconnected;
  394.         default:
  395.                 return connector_status_unknown;
  396.         }
  397. }
  398.  
  399. /**
  400.  * scale - scale values from one range to another
  401.  *
  402.  * @source_val: value in range [@source_min..@source_max]
  403.  *
  404.  * Return @source_val in range [@source_min..@source_max] scaled to range
  405.  * [@target_min..@target_max].
  406.  */
  407. static uint32_t scale(uint32_t source_val,
  408.                       uint32_t source_min, uint32_t source_max,
  409.                       uint32_t target_min, uint32_t target_max)
  410. {
  411.         uint64_t target_val;
  412.  
  413.         WARN_ON(source_min > source_max);
  414.         WARN_ON(target_min > target_max);
  415.  
  416.         /* defensive */
  417.         source_val = clamp(source_val, source_min, source_max);
  418.  
  419.         /* avoid overflows */
  420.         target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
  421.                         (target_max - target_min), source_max - source_min);
  422.         target_val += target_min;
  423.  
  424.         return target_val;
  425. }
  426.  
  427. /* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
  428. static inline u32 scale_user_to_hw(struct intel_connector *connector,
  429.                                    u32 user_level, u32 user_max)
  430. {
  431.         struct intel_panel *panel = &connector->panel;
  432.  
  433.         return scale(user_level, 0, user_max,
  434.                      panel->backlight.min, panel->backlight.max);
  435. }
  436.  
  437. /* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
  438.  * to [hw_min..hw_max]. */
  439. static inline u32 clamp_user_to_hw(struct intel_connector *connector,
  440.                                    u32 user_level, u32 user_max)
  441. {
  442.         struct intel_panel *panel = &connector->panel;
  443.         u32 hw_level;
  444.  
  445.         hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
  446.         hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
  447.  
  448.         return hw_level;
  449. }
  450.  
  451. /* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
  452. static inline u32 scale_hw_to_user(struct intel_connector *connector,
  453.                                    u32 hw_level, u32 user_max)
  454. {
  455.         struct intel_panel *panel = &connector->panel;
  456.  
  457.         return scale(hw_level, panel->backlight.min, panel->backlight.max,
  458.                      0, user_max);
  459. }
  460.  
  461. static u32 intel_panel_compute_brightness(struct intel_connector *connector,
  462.                                           u32 val)
  463. {
  464.         struct drm_device *dev = connector->base.dev;
  465.         struct drm_i915_private *dev_priv = dev->dev_private;
  466.         struct intel_panel *panel = &connector->panel;
  467.  
  468.         WARN_ON(panel->backlight.max == 0);
  469.  
  470.         if (i915.invert_brightness < 0)
  471.                 return val;
  472.  
  473.         if (i915.invert_brightness > 0 ||
  474.             dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
  475.                 return panel->backlight.max - val;
  476.         }
  477.  
  478.         return val;
  479. }
  480.  
  481. static u32 lpt_get_backlight(struct intel_connector *connector)
  482. {
  483.         struct drm_device *dev = connector->base.dev;
  484.         struct drm_i915_private *dev_priv = dev->dev_private;
  485.  
  486.         return I915_READ(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
  487. }
  488.  
  489. static u32 pch_get_backlight(struct intel_connector *connector)
  490. {
  491.         struct drm_device *dev = connector->base.dev;
  492.         struct drm_i915_private *dev_priv = dev->dev_private;
  493.  
  494.         return I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  495. }
  496.  
  497. static u32 i9xx_get_backlight(struct intel_connector *connector)
  498. {
  499.         struct drm_device *dev = connector->base.dev;
  500.         struct drm_i915_private *dev_priv = dev->dev_private;
  501.         struct intel_panel *panel = &connector->panel;
  502.         u32 val;
  503.  
  504.         val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
  505.         if (INTEL_INFO(dev)->gen < 4)
  506.                 val >>= 1;
  507.  
  508.         if (panel->backlight.combination_mode) {
  509.                 u8 lbpc;
  510.  
  511.                 pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
  512.                 val *= lbpc;
  513.         }
  514.  
  515.         return val;
  516. }
  517.  
  518. static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
  519. {
  520.         struct drm_i915_private *dev_priv = dev->dev_private;
  521.  
  522.         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
  523.                 return 0;
  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 bxt_get_backlight(struct intel_connector *connector)
  537. {
  538.         struct drm_device *dev = connector->base.dev;
  539.         struct intel_panel *panel = &connector->panel;
  540.         struct drm_i915_private *dev_priv = dev->dev_private;
  541.  
  542.         return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller));
  543. }
  544.  
  545. static u32 pwm_get_backlight(struct intel_connector *connector)
  546. {
  547.         struct intel_panel *panel = &connector->panel;
  548.         int duty_ns;
  549.  
  550.         duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
  551.         return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
  552. }
  553.  
  554. static u32 intel_panel_get_backlight(struct intel_connector *connector)
  555. {
  556.         struct drm_device *dev = connector->base.dev;
  557.         struct drm_i915_private *dev_priv = dev->dev_private;
  558.         struct intel_panel *panel = &connector->panel;
  559.         u32 val = 0;
  560.  
  561.         mutex_lock(&dev_priv->backlight_lock);
  562.  
  563.         if (panel->backlight.enabled) {
  564.                 val = panel->backlight.get(connector);
  565.                 val = intel_panel_compute_brightness(connector, val);
  566.         }
  567.  
  568.         mutex_unlock(&dev_priv->backlight_lock);
  569.  
  570.         DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
  571.         return val;
  572. }
  573.  
  574. static void lpt_set_backlight(struct intel_connector *connector, u32 level)
  575. {
  576.         struct drm_device *dev = connector->base.dev;
  577.         struct drm_i915_private *dev_priv = dev->dev_private;
  578.         u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  579.         I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
  580. }
  581.  
  582. static void pch_set_backlight(struct intel_connector *connector, u32 level)
  583. {
  584.         struct drm_device *dev = connector->base.dev;
  585.         struct drm_i915_private *dev_priv = dev->dev_private;
  586.         u32 tmp;
  587.  
  588.         tmp = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  589.         I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
  590. }
  591.  
  592. static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
  593. {
  594.         struct drm_device *dev = connector->base.dev;
  595.         struct drm_i915_private *dev_priv = dev->dev_private;
  596.         struct intel_panel *panel = &connector->panel;
  597.         u32 tmp, mask;
  598.  
  599.         WARN_ON(panel->backlight.max == 0);
  600.  
  601.         if (panel->backlight.combination_mode) {
  602.                 u8 lbpc;
  603.  
  604.                 lbpc = level * 0xfe / panel->backlight.max + 1;
  605.                 level /= lbpc;
  606.                 pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);
  607.         }
  608.  
  609.         if (IS_GEN4(dev)) {
  610.                 mask = BACKLIGHT_DUTY_CYCLE_MASK;
  611.         } else {
  612.                 level <<= 1;
  613.                 mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
  614.         }
  615.  
  616.         tmp = I915_READ(BLC_PWM_CTL) & ~mask;
  617.         I915_WRITE(BLC_PWM_CTL, tmp | level);
  618. }
  619.  
  620. static void vlv_set_backlight(struct intel_connector *connector, u32 level)
  621. {
  622.         struct drm_device *dev = connector->base.dev;
  623.         struct drm_i915_private *dev_priv = dev->dev_private;
  624.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  625.         u32 tmp;
  626.  
  627.         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
  628.                 return;
  629.  
  630.         tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
  631.         I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
  632. }
  633.  
  634. static void bxt_set_backlight(struct intel_connector *connector, u32 level)
  635. {
  636.         struct drm_device *dev = connector->base.dev;
  637.         struct drm_i915_private *dev_priv = dev->dev_private;
  638.         struct intel_panel *panel = &connector->panel;
  639.  
  640.         I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
  641. }
  642.  
  643. static void pwm_set_backlight(struct intel_connector *connector, u32 level)
  644. {
  645.         struct intel_panel *panel = &connector->panel;
  646.         int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
  647.  
  648.         pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
  649. }
  650.  
  651. static void
  652. intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
  653. {
  654.         struct intel_panel *panel = &connector->panel;
  655.  
  656.         DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
  657.  
  658.         level = intel_panel_compute_brightness(connector, level);
  659.         panel->backlight.set(connector, level);
  660. }
  661.  
  662. /* set backlight brightness to level in range [0..max], scaling wrt hw min */
  663. static void intel_panel_set_backlight(struct intel_connector *connector,
  664.                                       u32 user_level, u32 user_max)
  665. {
  666.         struct drm_device *dev = connector->base.dev;
  667.         struct drm_i915_private *dev_priv = dev->dev_private;
  668.         struct intel_panel *panel = &connector->panel;
  669.         u32 hw_level;
  670.  
  671.         if (!panel->backlight.present)
  672.                 return;
  673.  
  674.         mutex_lock(&dev_priv->backlight_lock);
  675.  
  676.         WARN_ON(panel->backlight.max == 0);
  677.  
  678.         hw_level = scale_user_to_hw(connector, user_level, user_max);
  679.         panel->backlight.level = hw_level;
  680.  
  681.         if (panel->backlight.enabled)
  682.                 intel_panel_actually_set_backlight(connector, hw_level);
  683.  
  684.         mutex_unlock(&dev_priv->backlight_lock);
  685. }
  686.  
  687. /* set backlight brightness to level in range [0..max], assuming hw min is
  688.  * respected.
  689.  */
  690. void intel_panel_set_backlight_acpi(struct intel_connector *connector,
  691.                                     u32 user_level, u32 user_max)
  692. {
  693.         struct drm_device *dev = connector->base.dev;
  694.         struct drm_i915_private *dev_priv = dev->dev_private;
  695.         struct intel_panel *panel = &connector->panel;
  696.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  697.         u32 hw_level;
  698.  
  699.         /*
  700.          * INVALID_PIPE may occur during driver init because
  701.          * connection_mutex isn't held across the entire backlight
  702.          * setup + modeset readout, and the BIOS can issue the
  703.          * requests at any time.
  704.          */
  705.         if (!panel->backlight.present || pipe == INVALID_PIPE)
  706.                 return;
  707.  
  708.         mutex_lock(&dev_priv->backlight_lock);
  709.  
  710.         WARN_ON(panel->backlight.max == 0);
  711.  
  712.         hw_level = clamp_user_to_hw(connector, user_level, user_max);
  713.         panel->backlight.level = hw_level;
  714.  
  715.         mutex_unlock(&dev_priv->backlight_lock);
  716. }
  717.  
  718. static void lpt_disable_backlight(struct intel_connector *connector)
  719. {
  720.         struct drm_device *dev = connector->base.dev;
  721.         struct drm_i915_private *dev_priv = dev->dev_private;
  722.         u32 tmp;
  723.  
  724.         intel_panel_actually_set_backlight(connector, 0);
  725.  
  726.         /*
  727.          * Although we don't support or enable CPU PWM with LPT/SPT based
  728.          * systems, it may have been enabled prior to loading the
  729.          * driver. Disable to avoid warnings on LCPLL disable.
  730.          *
  731.          * This needs rework if we need to add support for CPU PWM on PCH split
  732.          * platforms.
  733.          */
  734.         tmp = I915_READ(BLC_PWM_CPU_CTL2);
  735.         if (tmp & BLM_PWM_ENABLE) {
  736.                 DRM_DEBUG_KMS("cpu backlight was enabled, disabling\n");
  737.                 I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
  738.         }
  739.  
  740.         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  741.         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
  742. }
  743.  
  744. static void pch_disable_backlight(struct intel_connector *connector)
  745. {
  746.         struct drm_device *dev = connector->base.dev;
  747.         struct drm_i915_private *dev_priv = dev->dev_private;
  748.         u32 tmp;
  749.  
  750.         intel_panel_actually_set_backlight(connector, 0);
  751.  
  752.         tmp = I915_READ(BLC_PWM_CPU_CTL2);
  753.         I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
  754.  
  755.         tmp = I915_READ(BLC_PWM_PCH_CTL1);
  756.         I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
  757. }
  758.  
  759. static void i9xx_disable_backlight(struct intel_connector *connector)
  760. {
  761.         intel_panel_actually_set_backlight(connector, 0);
  762. }
  763.  
  764. static void i965_disable_backlight(struct intel_connector *connector)
  765. {
  766.         struct drm_device *dev = connector->base.dev;
  767.         struct drm_i915_private *dev_priv = dev->dev_private;
  768.         u32 tmp;
  769.  
  770.         intel_panel_actually_set_backlight(connector, 0);
  771.  
  772.         tmp = I915_READ(BLC_PWM_CTL2);
  773.         I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
  774. }
  775.  
  776. static void vlv_disable_backlight(struct intel_connector *connector)
  777. {
  778.         struct drm_device *dev = connector->base.dev;
  779.         struct drm_i915_private *dev_priv = dev->dev_private;
  780.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  781.         u32 tmp;
  782.  
  783.         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
  784.                 return;
  785.  
  786.         intel_panel_actually_set_backlight(connector, 0);
  787.  
  788.         tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
  789.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
  790. }
  791.  
  792. static void bxt_disable_backlight(struct intel_connector *connector)
  793. {
  794.         struct drm_device *dev = connector->base.dev;
  795.         struct drm_i915_private *dev_priv = dev->dev_private;
  796.         struct intel_panel *panel = &connector->panel;
  797.         u32 tmp, val;
  798.  
  799.         intel_panel_actually_set_backlight(connector, 0);
  800.  
  801.         tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
  802.         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
  803.                         tmp & ~BXT_BLC_PWM_ENABLE);
  804.  
  805.         if (panel->backlight.controller == 1) {
  806.                 val = I915_READ(UTIL_PIN_CTL);
  807.                 val &= ~UTIL_PIN_ENABLE;
  808.                 I915_WRITE(UTIL_PIN_CTL, val);
  809.         }
  810. }
  811.  
  812. static void pwm_disable_backlight(struct intel_connector *connector)
  813. {
  814.         struct intel_panel *panel = &connector->panel;
  815.  
  816.         /* Disable the backlight */
  817.         pwm_config(panel->backlight.pwm, 0, CRC_PMIC_PWM_PERIOD_NS);
  818.         usleep_range(2000, 3000);
  819.         pwm_disable(panel->backlight.pwm);
  820. }
  821.  
  822. void intel_panel_disable_backlight(struct intel_connector *connector)
  823. {
  824.         struct drm_device *dev = connector->base.dev;
  825.         struct drm_i915_private *dev_priv = dev->dev_private;
  826.         struct intel_panel *panel = &connector->panel;
  827.  
  828.         if (!panel->backlight.present)
  829.                 return;
  830.  
  831.         /*
  832.          * Do not disable backlight on the vga_switcheroo path. When switching
  833.          * away from i915, the other client may depend on i915 to handle the
  834.          * backlight. This will leave the backlight on unnecessarily when
  835.          * another client is not activated.
  836.          */
  837.         if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) {
  838.                 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
  839.                 return;
  840.         }
  841.  
  842.         mutex_lock(&dev_priv->backlight_lock);
  843.  
  844.     panel->backlight.enabled = false;
  845.         panel->backlight.disable(connector);
  846.  
  847.         mutex_unlock(&dev_priv->backlight_lock);
  848. }
  849.  
  850. static void lpt_enable_backlight(struct intel_connector *connector)
  851. {
  852.         struct drm_device *dev = connector->base.dev;
  853.         struct drm_i915_private *dev_priv = dev->dev_private;
  854.         struct intel_panel *panel = &connector->panel;
  855.         u32 pch_ctl1, pch_ctl2;
  856.  
  857.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  858.         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
  859.                 DRM_DEBUG_KMS("pch backlight already enabled\n");
  860.                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
  861.                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  862.         }
  863.  
  864.         pch_ctl2 = panel->backlight.max << 16;
  865.         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
  866.  
  867.         pch_ctl1 = 0;
  868.         if (panel->backlight.active_low_pwm)
  869.                 pch_ctl1 |= BLM_PCH_POLARITY;
  870.  
  871.         /* After LPT, override is the default. */
  872.         if (HAS_PCH_LPT(dev_priv))
  873.                 pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
  874.  
  875.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  876.         POSTING_READ(BLC_PWM_PCH_CTL1);
  877.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
  878.  
  879.         /* This won't stick until the above enable. */
  880.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  881. }
  882.  
  883. static void pch_enable_backlight(struct intel_connector *connector)
  884. {
  885.         struct drm_device *dev = connector->base.dev;
  886.         struct drm_i915_private *dev_priv = dev->dev_private;
  887.         struct intel_panel *panel = &connector->panel;
  888.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  889.         enum transcoder cpu_transcoder =
  890.                 intel_pipe_to_cpu_transcoder(dev_priv, pipe);
  891.         u32 cpu_ctl2, pch_ctl1, pch_ctl2;
  892.  
  893.         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
  894.         if (cpu_ctl2 & BLM_PWM_ENABLE) {
  895.                 DRM_DEBUG_KMS("cpu backlight already enabled\n");
  896.                 cpu_ctl2 &= ~BLM_PWM_ENABLE;
  897.                 I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
  898.         }
  899.  
  900.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  901.         if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
  902.                 DRM_DEBUG_KMS("pch backlight already enabled\n");
  903.                 pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
  904.                 I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  905.         }
  906.  
  907.         if (cpu_transcoder == TRANSCODER_EDP)
  908.                 cpu_ctl2 = BLM_TRANSCODER_EDP;
  909.         else
  910.                 cpu_ctl2 = BLM_PIPE(cpu_transcoder);
  911.         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
  912.         POSTING_READ(BLC_PWM_CPU_CTL2);
  913.         I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
  914.  
  915.         /* This won't stick until the above enable. */
  916.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  917.  
  918.         pch_ctl2 = panel->backlight.max << 16;
  919.         I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
  920.  
  921.         pch_ctl1 = 0;
  922.         if (panel->backlight.active_low_pwm)
  923.                 pch_ctl1 |= BLM_PCH_POLARITY;
  924.  
  925.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
  926.         POSTING_READ(BLC_PWM_PCH_CTL1);
  927.         I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
  928. }
  929.  
  930. static void i9xx_enable_backlight(struct intel_connector *connector)
  931. {
  932.         struct drm_device *dev = connector->base.dev;
  933.         struct drm_i915_private *dev_priv = dev->dev_private;
  934.         struct intel_panel *panel = &connector->panel;
  935.         u32 ctl, freq;
  936.  
  937.         ctl = I915_READ(BLC_PWM_CTL);
  938.         if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
  939.                 DRM_DEBUG_KMS("backlight already enabled\n");
  940.                 I915_WRITE(BLC_PWM_CTL, 0);
  941.         }
  942.  
  943.         freq = panel->backlight.max;
  944.         if (panel->backlight.combination_mode)
  945.                 freq /= 0xff;
  946.  
  947.         ctl = freq << 17;
  948.         if (panel->backlight.combination_mode)
  949.                 ctl |= BLM_LEGACY_MODE;
  950.         if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
  951.                 ctl |= BLM_POLARITY_PNV;
  952.  
  953.         I915_WRITE(BLC_PWM_CTL, ctl);
  954.         POSTING_READ(BLC_PWM_CTL);
  955.  
  956.         /* XXX: combine this into above write? */
  957.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  958.  
  959.         /*
  960.          * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
  961.          * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
  962.          * that has backlight.
  963.          */
  964.         if (IS_GEN2(dev))
  965.                 I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
  966. }
  967.  
  968. static void i965_enable_backlight(struct intel_connector *connector)
  969. {
  970.         struct drm_device *dev = connector->base.dev;
  971.         struct drm_i915_private *dev_priv = dev->dev_private;
  972.         struct intel_panel *panel = &connector->panel;
  973.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  974.         u32 ctl, ctl2, freq;
  975.  
  976.         ctl2 = I915_READ(BLC_PWM_CTL2);
  977.         if (ctl2 & BLM_PWM_ENABLE) {
  978.                 DRM_DEBUG_KMS("backlight already enabled\n");
  979.                 ctl2 &= ~BLM_PWM_ENABLE;
  980.                 I915_WRITE(BLC_PWM_CTL2, ctl2);
  981.         }
  982.  
  983.         freq = panel->backlight.max;
  984.         if (panel->backlight.combination_mode)
  985.                 freq /= 0xff;
  986.  
  987.         ctl = freq << 16;
  988.         I915_WRITE(BLC_PWM_CTL, ctl);
  989.  
  990.         ctl2 = BLM_PIPE(pipe);
  991.         if (panel->backlight.combination_mode)
  992.                 ctl2 |= BLM_COMBINATION_MODE;
  993.         if (panel->backlight.active_low_pwm)
  994.                 ctl2 |= BLM_POLARITY_I965;
  995.         I915_WRITE(BLC_PWM_CTL2, ctl2);
  996.         POSTING_READ(BLC_PWM_CTL2);
  997.         I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
  998.  
  999.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  1000. }
  1001.  
  1002. static void vlv_enable_backlight(struct intel_connector *connector)
  1003. {
  1004.         struct drm_device *dev = connector->base.dev;
  1005.         struct drm_i915_private *dev_priv = dev->dev_private;
  1006.         struct intel_panel *panel = &connector->panel;
  1007.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  1008.         u32 ctl, ctl2;
  1009.  
  1010.         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
  1011.                 return;
  1012.  
  1013.         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
  1014.         if (ctl2 & BLM_PWM_ENABLE) {
  1015.                 DRM_DEBUG_KMS("backlight already enabled\n");
  1016.                 ctl2 &= ~BLM_PWM_ENABLE;
  1017.                 I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
  1018.         }
  1019.  
  1020.         ctl = panel->backlight.max << 16;
  1021.         I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
  1022.  
  1023.         /* XXX: combine this into above write? */
  1024.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  1025.  
  1026.         ctl2 = 0;
  1027.         if (panel->backlight.active_low_pwm)
  1028.                 ctl2 |= BLM_POLARITY_I965;
  1029.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
  1030.         POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
  1031.         I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
  1032. }
  1033.  
  1034. static void bxt_enable_backlight(struct intel_connector *connector)
  1035. {
  1036.         struct drm_device *dev = connector->base.dev;
  1037.         struct drm_i915_private *dev_priv = dev->dev_private;
  1038.         struct intel_panel *panel = &connector->panel;
  1039.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  1040.         u32 pwm_ctl, val;
  1041.  
  1042.         /* To use 2nd set of backlight registers, utility pin has to be
  1043.          * enabled with PWM mode.
  1044.          * The field should only be changed when the utility pin is disabled
  1045.          */
  1046.         if (panel->backlight.controller == 1) {
  1047.                 val = I915_READ(UTIL_PIN_CTL);
  1048.                 if (val & UTIL_PIN_ENABLE) {
  1049.                         DRM_DEBUG_KMS("util pin already enabled\n");
  1050.                         val &= ~UTIL_PIN_ENABLE;
  1051.                         I915_WRITE(UTIL_PIN_CTL, val);
  1052.                 }
  1053.  
  1054.                 val = 0;
  1055.                 if (panel->backlight.util_pin_active_low)
  1056.                         val |= UTIL_PIN_POLARITY;
  1057.                 I915_WRITE(UTIL_PIN_CTL, val | UTIL_PIN_PIPE(pipe) |
  1058.                                 UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
  1059.         }
  1060.  
  1061.         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
  1062.         if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
  1063.                 DRM_DEBUG_KMS("backlight already enabled\n");
  1064.                 pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
  1065.                 I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
  1066.                                 pwm_ctl);
  1067.         }
  1068.  
  1069.         I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
  1070.                         panel->backlight.max);
  1071.  
  1072.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  1073.  
  1074.         pwm_ctl = 0;
  1075.         if (panel->backlight.active_low_pwm)
  1076.                 pwm_ctl |= BXT_BLC_PWM_POLARITY;
  1077.  
  1078.         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
  1079.         POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
  1080.         I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
  1081.                         pwm_ctl | BXT_BLC_PWM_ENABLE);
  1082. }
  1083.  
  1084. static void pwm_enable_backlight(struct intel_connector *connector)
  1085. {
  1086.         struct intel_panel *panel = &connector->panel;
  1087.  
  1088.         pwm_enable(panel->backlight.pwm);
  1089.         intel_panel_actually_set_backlight(connector, panel->backlight.level);
  1090. }
  1091.  
  1092. void intel_panel_enable_backlight(struct intel_connector *connector)
  1093. {
  1094.         struct drm_device *dev = connector->base.dev;
  1095.         struct drm_i915_private *dev_priv = dev->dev_private;
  1096.         struct intel_panel *panel = &connector->panel;
  1097.         enum pipe pipe = intel_get_pipe_from_connector(connector);
  1098.  
  1099.         if (!panel->backlight.present)
  1100.                 return;
  1101.  
  1102.         DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
  1103.  
  1104.         mutex_lock(&dev_priv->backlight_lock);
  1105.  
  1106.         WARN_ON(panel->backlight.max == 0);
  1107.  
  1108.         panel->backlight.enable(connector);
  1109.         panel->backlight.enabled = true;
  1110.  
  1111.         mutex_unlock(&dev_priv->backlight_lock);
  1112. }
  1113.  
  1114. #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
  1115. static int intel_backlight_device_update_status(struct backlight_device *bd)
  1116. {
  1117.         struct intel_connector *connector = bl_get_data(bd);
  1118.         struct intel_panel *panel = &connector->panel;
  1119.         struct drm_device *dev = connector->base.dev;
  1120.  
  1121.         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
  1122.         DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
  1123.                       bd->props.brightness, bd->props.max_brightness);
  1124.         intel_panel_set_backlight(connector, bd->props.brightness,
  1125.                                   bd->props.max_brightness);
  1126.  
  1127.         /*
  1128.          * Allow flipping bl_power as a sub-state of enabled. Sadly the
  1129.          * backlight class device does not make it easy to to differentiate
  1130.          * between callbacks for brightness and bl_power, so our backlight_power
  1131.          * callback needs to take this into account.
  1132.          */
  1133.         if (panel->backlight.enabled) {
  1134.                 if (panel->backlight.power) {
  1135.                         bool enable = bd->props.power == FB_BLANK_UNBLANK &&
  1136.                                 bd->props.brightness != 0;
  1137.                         panel->backlight.power(connector, enable);
  1138.                 }
  1139.         } else {
  1140.                 bd->props.power = FB_BLANK_POWERDOWN;
  1141.         }
  1142.  
  1143.         drm_modeset_unlock(&dev->mode_config.connection_mutex);
  1144.         return 0;
  1145. }
  1146.  
  1147. static int intel_backlight_device_get_brightness(struct backlight_device *bd)
  1148. {
  1149.         struct intel_connector *connector = bl_get_data(bd);
  1150.         struct drm_device *dev = connector->base.dev;
  1151.         struct drm_i915_private *dev_priv = dev->dev_private;
  1152.         u32 hw_level;
  1153.         int ret;
  1154.  
  1155.         intel_runtime_pm_get(dev_priv);
  1156.         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
  1157.  
  1158.         hw_level = intel_panel_get_backlight(connector);
  1159.         ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
  1160.  
  1161.         drm_modeset_unlock(&dev->mode_config.connection_mutex);
  1162.         intel_runtime_pm_put(dev_priv);
  1163.  
  1164.         return ret;
  1165. }
  1166.  
  1167. static const struct backlight_ops intel_backlight_device_ops = {
  1168.         .update_status = intel_backlight_device_update_status,
  1169.         .get_brightness = intel_backlight_device_get_brightness,
  1170. };
  1171.  
  1172. static int intel_backlight_device_register(struct intel_connector *connector)
  1173. {
  1174.         struct intel_panel *panel = &connector->panel;
  1175.         struct backlight_properties props;
  1176.  
  1177.         if (WARN_ON(panel->backlight.device))
  1178.                 return -ENODEV;
  1179.  
  1180.         if (!panel->backlight.present)
  1181.                 return 0;
  1182.  
  1183.         WARN_ON(panel->backlight.max == 0);
  1184.  
  1185.         memset(&props, 0, sizeof(props));
  1186.         props.type = BACKLIGHT_RAW;
  1187.  
  1188.         /*
  1189.          * Note: Everything should work even if the backlight device max
  1190.          * presented to the userspace is arbitrarily chosen.
  1191.          */
  1192.         props.max_brightness = panel->backlight.max;
  1193.         props.brightness = scale_hw_to_user(connector,
  1194.                                             panel->backlight.level,
  1195.                                             props.max_brightness);
  1196.  
  1197.         if (panel->backlight.enabled)
  1198.                 props.power = FB_BLANK_UNBLANK;
  1199.         else
  1200.                 props.power = FB_BLANK_POWERDOWN;
  1201.  
  1202.         /*
  1203.          * Note: using the same name independent of the connector prevents
  1204.          * registration of multiple backlight devices in the driver.
  1205.          */
  1206.         panel->backlight.device =
  1207.                 backlight_device_register("intel_backlight",
  1208.                                           connector->base.kdev,
  1209.                                           connector,
  1210.                                           &intel_backlight_device_ops, &props);
  1211.  
  1212.         if (IS_ERR(panel->backlight.device)) {
  1213.                 DRM_ERROR("Failed to register backlight: %ld\n",
  1214.                           PTR_ERR(panel->backlight.device));
  1215.                 panel->backlight.device = NULL;
  1216.                 return -ENODEV;
  1217.         }
  1218.  
  1219.         DRM_DEBUG_KMS("Connector %s backlight sysfs interface registered\n",
  1220.                       connector->base.name);
  1221.  
  1222.         return 0;
  1223. }
  1224.  
  1225. static void intel_backlight_device_unregister(struct intel_connector *connector)
  1226. {
  1227.         struct intel_panel *panel = &connector->panel;
  1228.  
  1229.         if (panel->backlight.device) {
  1230.                 backlight_device_unregister(panel->backlight.device);
  1231.                 panel->backlight.device = NULL;
  1232.         }
  1233. }
  1234. #else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
  1235. static int intel_backlight_device_register(struct intel_connector *connector)
  1236. {
  1237.         return 0;
  1238. }
  1239. static void intel_backlight_device_unregister(struct intel_connector *connector)
  1240. {
  1241. }
  1242. #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
  1243.  
  1244. /*
  1245.  * SPT: This value represents the period of the PWM stream in clock periods
  1246.  * multiplied by 16 (default increment) or 128 (alternate increment selected in
  1247.  * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
  1248.  */
  1249. static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1250. {
  1251.         struct drm_device *dev = connector->base.dev;
  1252.         struct drm_i915_private *dev_priv = dev->dev_private;
  1253.         u32 mul, clock;
  1254.  
  1255.         if (I915_READ(SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY)
  1256.                 mul = 128;
  1257.         else
  1258.                 mul = 16;
  1259.  
  1260.         clock = MHz(24);
  1261.  
  1262.         return clock / (pwm_freq_hz * mul);
  1263. }
  1264.  
  1265. /*
  1266.  * LPT: This value represents the period of the PWM stream in clock periods
  1267.  * multiplied by 128 (default increment) or 16 (alternate increment, selected in
  1268.  * LPT SOUTH_CHICKEN2 register bit 5).
  1269.  */
  1270. static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1271. {
  1272.         struct drm_device *dev = connector->base.dev;
  1273.         struct drm_i915_private *dev_priv = dev->dev_private;
  1274.         u32 mul, clock;
  1275.  
  1276.         if (I915_READ(SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY)
  1277.                 mul = 16;
  1278.         else
  1279.                 mul = 128;
  1280.  
  1281.         if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE)
  1282.                 clock = MHz(135); /* LPT:H */
  1283.         else
  1284.                 clock = MHz(24); /* LPT:LP */
  1285.  
  1286.         return clock / (pwm_freq_hz * mul);
  1287. }
  1288.  
  1289. /*
  1290.  * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
  1291.  * display raw clocks multiplied by 128.
  1292.  */
  1293. static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1294. {
  1295.         struct drm_device *dev = connector->base.dev;
  1296.         int clock = MHz(intel_pch_rawclk(dev));
  1297.  
  1298.         return clock / (pwm_freq_hz * 128);
  1299. }
  1300.  
  1301. /*
  1302.  * Gen2: This field determines the number of time base events (display core
  1303.  * clock frequency/32) in total for a complete cycle of modulated backlight
  1304.  * control.
  1305.  *
  1306.  * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
  1307.  * divided by 32.
  1308.  */
  1309. static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1310. {
  1311.         struct drm_device *dev = connector->base.dev;
  1312.         struct drm_i915_private *dev_priv = dev->dev_private;
  1313.         int clock;
  1314.  
  1315.         if (IS_PINEVIEW(dev))
  1316.                 clock = intel_hrawclk(dev);
  1317.         else
  1318.                 clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
  1319.  
  1320.         return clock / (pwm_freq_hz * 32);
  1321. }
  1322.  
  1323. /*
  1324.  * Gen4: This value represents the period of the PWM stream in display core
  1325.  * clocks multiplied by 128.
  1326.  */
  1327. static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1328. {
  1329.         struct drm_device *dev = connector->base.dev;
  1330.         struct drm_i915_private *dev_priv = dev->dev_private;
  1331.         int clock = 1000 * dev_priv->display.get_display_clock_speed(dev);
  1332.  
  1333.         return clock / (pwm_freq_hz * 128);
  1334. }
  1335.  
  1336. /*
  1337.  * VLV: This value represents the period of the PWM stream in display core
  1338.  * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
  1339.  * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
  1340.  */
  1341. static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
  1342. {
  1343.         struct drm_device *dev = connector->base.dev;
  1344.         struct drm_i915_private *dev_priv = dev->dev_private;
  1345.         int clock;
  1346.  
  1347.         if ((I915_READ(CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
  1348.                 if (IS_CHERRYVIEW(dev))
  1349.                         return KHz(19200) / (pwm_freq_hz * 16);
  1350.                 else
  1351.                         return MHz(25) / (pwm_freq_hz * 16);
  1352.         } else {
  1353.                 clock = intel_hrawclk(dev);
  1354.                 return MHz(clock) / (pwm_freq_hz * 128);
  1355.         }
  1356. }
  1357.  
  1358. static u32 get_backlight_max_vbt(struct intel_connector *connector)
  1359. {
  1360.         struct drm_device *dev = connector->base.dev;
  1361.         struct drm_i915_private *dev_priv = dev->dev_private;
  1362.         struct intel_panel *panel = &connector->panel;
  1363.         u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
  1364.         u32 pwm;
  1365.  
  1366.         if (!pwm_freq_hz) {
  1367.                 DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
  1368.                 return 0;
  1369.         }
  1370.  
  1371.         if (!panel->backlight.hz_to_pwm) {
  1372.                 DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
  1373.                 return 0;
  1374.         }
  1375.  
  1376.         pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
  1377.         if (!pwm) {
  1378.                 DRM_DEBUG_KMS("backlight frequency conversion failed\n");
  1379.                 return 0;
  1380.         }
  1381.  
  1382.         DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
  1383.  
  1384.         return pwm;
  1385. }
  1386.  
  1387. /*
  1388.  * Note: The setup hooks can't assume pipe is set!
  1389.  */
  1390. static u32 get_backlight_min_vbt(struct intel_connector *connector)
  1391. {
  1392.         struct drm_device *dev = connector->base.dev;
  1393.         struct drm_i915_private *dev_priv = dev->dev_private;
  1394.         struct intel_panel *panel = &connector->panel;
  1395.         int min;
  1396.  
  1397.         WARN_ON(panel->backlight.max == 0);
  1398.  
  1399.         /*
  1400.          * XXX: If the vbt value is 255, it makes min equal to max, which leads
  1401.          * to problems. There are such machines out there. Either our
  1402.          * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
  1403.          * against this by letting the minimum be at most (arbitrarily chosen)
  1404.          * 25% of the max.
  1405.          */
  1406.         min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
  1407.         if (min != dev_priv->vbt.backlight.min_brightness) {
  1408.                 DRM_DEBUG_KMS("clamping VBT min backlight %d/255 to %d/255\n",
  1409.                               dev_priv->vbt.backlight.min_brightness, min);
  1410.         }
  1411.  
  1412.         /* vbt value is a coefficient in range [0..255] */
  1413.         return scale(min, 0, 255, 0, panel->backlight.max);
  1414. }
  1415.  
  1416. static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
  1417. {
  1418.         struct drm_device *dev = connector->base.dev;
  1419.         struct drm_i915_private *dev_priv = dev->dev_private;
  1420.         struct intel_panel *panel = &connector->panel;
  1421.         u32 pch_ctl1, pch_ctl2, val;
  1422.  
  1423.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  1424.         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
  1425.  
  1426.         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
  1427.         panel->backlight.max = pch_ctl2 >> 16;
  1428.  
  1429.         if (!panel->backlight.max)
  1430.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1431.  
  1432.         if (!panel->backlight.max)
  1433.                 return -ENODEV;
  1434.  
  1435.         panel->backlight.min = get_backlight_min_vbt(connector);
  1436.  
  1437.         val = lpt_get_backlight(connector);
  1438.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1439.  
  1440.         panel->backlight.enabled = (pch_ctl1 & BLM_PCH_PWM_ENABLE) &&
  1441.                 panel->backlight.level != 0;
  1442.  
  1443.         return 0;
  1444. }
  1445.  
  1446. static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
  1447. {
  1448.         struct drm_device *dev = connector->base.dev;
  1449.         struct drm_i915_private *dev_priv = dev->dev_private;
  1450.         struct intel_panel *panel = &connector->panel;
  1451.         u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
  1452.  
  1453.         pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
  1454.         panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
  1455.  
  1456.         pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
  1457.         panel->backlight.max = pch_ctl2 >> 16;
  1458.  
  1459.         if (!panel->backlight.max)
  1460.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1461.  
  1462.         if (!panel->backlight.max)
  1463.                 return -ENODEV;
  1464.  
  1465.         panel->backlight.min = get_backlight_min_vbt(connector);
  1466.  
  1467.         val = pch_get_backlight(connector);
  1468.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1469.  
  1470.         cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
  1471.         panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
  1472.                 (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
  1473.  
  1474.         return 0;
  1475. }
  1476.  
  1477. static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
  1478. {
  1479.         struct drm_device *dev = connector->base.dev;
  1480.         struct drm_i915_private *dev_priv = dev->dev_private;
  1481.         struct intel_panel *panel = &connector->panel;
  1482.         u32 ctl, val;
  1483.  
  1484.         ctl = I915_READ(BLC_PWM_CTL);
  1485.  
  1486.         if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
  1487.                 panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
  1488.  
  1489.         if (IS_PINEVIEW(dev))
  1490.                 panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
  1491.  
  1492.         panel->backlight.max = ctl >> 17;
  1493.  
  1494.         if (!panel->backlight.max) {
  1495.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1496.                 panel->backlight.max >>= 1;
  1497.         }
  1498.  
  1499.         if (!panel->backlight.max)
  1500.                 return -ENODEV;
  1501.  
  1502.         if (panel->backlight.combination_mode)
  1503.                 panel->backlight.max *= 0xff;
  1504.  
  1505.         panel->backlight.min = get_backlight_min_vbt(connector);
  1506.  
  1507.         val = i9xx_get_backlight(connector);
  1508.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1509.  
  1510.         panel->backlight.enabled = panel->backlight.level != 0;
  1511.  
  1512.         return 0;
  1513. }
  1514.  
  1515. static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
  1516. {
  1517.         struct drm_device *dev = connector->base.dev;
  1518.         struct drm_i915_private *dev_priv = dev->dev_private;
  1519.         struct intel_panel *panel = &connector->panel;
  1520.         u32 ctl, ctl2, val;
  1521.  
  1522.         ctl2 = I915_READ(BLC_PWM_CTL2);
  1523.         panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
  1524.         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
  1525.  
  1526.         ctl = I915_READ(BLC_PWM_CTL);
  1527.         panel->backlight.max = ctl >> 16;
  1528.  
  1529.         if (!panel->backlight.max)
  1530.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1531.  
  1532.         if (!panel->backlight.max)
  1533.                 return -ENODEV;
  1534.  
  1535.         if (panel->backlight.combination_mode)
  1536.                 panel->backlight.max *= 0xff;
  1537.  
  1538.         panel->backlight.min = get_backlight_min_vbt(connector);
  1539.  
  1540.         val = i9xx_get_backlight(connector);
  1541.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1542.  
  1543.         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
  1544.                 panel->backlight.level != 0;
  1545.  
  1546.         return 0;
  1547. }
  1548.  
  1549. static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
  1550. {
  1551.         struct drm_device *dev = connector->base.dev;
  1552.         struct drm_i915_private *dev_priv = dev->dev_private;
  1553.         struct intel_panel *panel = &connector->panel;
  1554.         u32 ctl, ctl2, val;
  1555.  
  1556.         if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
  1557.                 return -ENODEV;
  1558.  
  1559.         ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
  1560.         panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
  1561.  
  1562.         ctl = I915_READ(VLV_BLC_PWM_CTL(pipe));
  1563.         panel->backlight.max = ctl >> 16;
  1564.  
  1565.         if (!panel->backlight.max)
  1566.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1567.  
  1568.         if (!panel->backlight.max)
  1569.                 return -ENODEV;
  1570.  
  1571.         panel->backlight.min = get_backlight_min_vbt(connector);
  1572.  
  1573.         val = _vlv_get_backlight(dev, pipe);
  1574.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1575.  
  1576.         panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
  1577.                 panel->backlight.level != 0;
  1578.  
  1579.         return 0;
  1580. }
  1581.  
  1582. static int
  1583. bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
  1584. {
  1585.         struct drm_device *dev = connector->base.dev;
  1586.         struct drm_i915_private *dev_priv = dev->dev_private;
  1587.         struct intel_panel *panel = &connector->panel;
  1588.         u32 pwm_ctl, val;
  1589.  
  1590.         /*
  1591.          * For BXT hard coding the Backlight controller to 0.
  1592.          * TODO : Read the controller value from VBT and generalize
  1593.          */
  1594.         panel->backlight.controller = 0;
  1595.  
  1596.         pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
  1597.  
  1598.         /* Keeping the check if controller 1 is to be programmed.
  1599.          * This will come into affect once the VBT parsing
  1600.          * is fixed for controller selection, and controller 1 is used
  1601.          * for a prticular display configuration.
  1602.          */
  1603.         if (panel->backlight.controller == 1) {
  1604.                 val = I915_READ(UTIL_PIN_CTL);
  1605.                 panel->backlight.util_pin_active_low =
  1606.                                         val & UTIL_PIN_POLARITY;
  1607.         }
  1608.  
  1609.         panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
  1610.         panel->backlight.max =
  1611.                 I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
  1612.  
  1613.         if (!panel->backlight.max)
  1614.                 panel->backlight.max = get_backlight_max_vbt(connector);
  1615.  
  1616.         if (!panel->backlight.max)
  1617.                 return -ENODEV;
  1618.  
  1619.         val = bxt_get_backlight(connector);
  1620.         panel->backlight.level = intel_panel_compute_brightness(connector, val);
  1621.  
  1622.         panel->backlight.enabled = (pwm_ctl & BXT_BLC_PWM_ENABLE) &&
  1623.                 panel->backlight.level != 0;
  1624.  
  1625.         return 0;
  1626. }
  1627.  
  1628. static int pwm_setup_backlight(struct intel_connector *connector,
  1629.                                enum pipe pipe)
  1630. {
  1631.         struct drm_device *dev = connector->base.dev;
  1632.         struct intel_panel *panel = &connector->panel;
  1633.         int retval;
  1634.  
  1635.         /* Get the PWM chip for backlight control */
  1636.         panel->backlight.pwm = pwm_get(dev->dev, "pwm_backlight");
  1637.         if (IS_ERR(panel->backlight.pwm)) {
  1638.                 DRM_ERROR("Failed to own the pwm chip\n");
  1639.                 panel->backlight.pwm = NULL;
  1640.                 return -ENODEV;
  1641.         }
  1642.  
  1643.         retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
  1644.                             CRC_PMIC_PWM_PERIOD_NS);
  1645.         if (retval < 0) {
  1646.                 DRM_ERROR("Failed to configure the pwm chip\n");
  1647.                 pwm_put(panel->backlight.pwm);
  1648.                 panel->backlight.pwm = NULL;
  1649.                 return retval;
  1650.         }
  1651.  
  1652.         panel->backlight.min = 0; /* 0% */
  1653.         panel->backlight.max = 100; /* 100% */
  1654.         panel->backlight.level = DIV_ROUND_UP(
  1655.                                  pwm_get_duty_cycle(panel->backlight.pwm) * 100,
  1656.                                  CRC_PMIC_PWM_PERIOD_NS);
  1657.         panel->backlight.enabled = panel->backlight.level != 0;
  1658.  
  1659.         return 0;
  1660. }
  1661.  
  1662. int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
  1663. {
  1664.         struct drm_device *dev = connector->dev;
  1665.         struct drm_i915_private *dev_priv = dev->dev_private;
  1666.         struct intel_connector *intel_connector = to_intel_connector(connector);
  1667.         struct intel_panel *panel = &intel_connector->panel;
  1668.         int ret;
  1669.  
  1670.         if (!dev_priv->vbt.backlight.present) {
  1671.                 if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
  1672.                         DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
  1673.                 } else {
  1674.                         DRM_DEBUG_KMS("no backlight present per VBT\n");
  1675.                         return 0;
  1676.                 }
  1677.         }
  1678.  
  1679.         /* ensure intel_panel has been initialized first */
  1680.         if (WARN_ON(!panel->backlight.setup))
  1681.                 return -ENODEV;
  1682.  
  1683.         /* set level and max in panel struct */
  1684.         mutex_lock(&dev_priv->backlight_lock);
  1685.         ret = panel->backlight.setup(intel_connector, pipe);
  1686.         mutex_unlock(&dev_priv->backlight_lock);
  1687.  
  1688.         if (ret) {
  1689.                 DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
  1690.                               connector->name);
  1691.                 return ret;
  1692.         }
  1693.  
  1694.         panel->backlight.present = true;
  1695.  
  1696.         DRM_DEBUG_KMS("Connector %s backlight initialized, %s, brightness %u/%u\n",
  1697.                       connector->name,
  1698.                       panel->backlight.enabled ? "enabled" : "disabled",
  1699.                       panel->backlight.level, panel->backlight.max);
  1700.  
  1701.         return 0;
  1702. }
  1703.  
  1704. void intel_panel_destroy_backlight(struct drm_connector *connector)
  1705. {
  1706.         struct intel_connector *intel_connector = to_intel_connector(connector);
  1707.         struct intel_panel *panel = &intel_connector->panel;
  1708.  
  1709.         /* dispose of the pwm */
  1710.         if (panel->backlight.pwm)
  1711.                 pwm_put(panel->backlight.pwm);
  1712.  
  1713.         panel->backlight.present = false;
  1714. }
  1715.  
  1716. /* Set up chip specific backlight functions */
  1717. static void
  1718. intel_panel_init_backlight_funcs(struct intel_panel *panel)
  1719. {
  1720.         struct intel_connector *intel_connector =
  1721.                 container_of(panel, struct intel_connector, panel);
  1722.         struct drm_device *dev = intel_connector->base.dev;
  1723.         struct drm_i915_private *dev_priv = dev->dev_private;
  1724.  
  1725.         if (IS_BROXTON(dev)) {
  1726.                 panel->backlight.setup = bxt_setup_backlight;
  1727.                 panel->backlight.enable = bxt_enable_backlight;
  1728.                 panel->backlight.disable = bxt_disable_backlight;
  1729.                 panel->backlight.set = bxt_set_backlight;
  1730.                 panel->backlight.get = bxt_get_backlight;
  1731.         } else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
  1732.                 panel->backlight.setup = lpt_setup_backlight;
  1733.                 panel->backlight.enable = lpt_enable_backlight;
  1734.                 panel->backlight.disable = lpt_disable_backlight;
  1735.                 panel->backlight.set = lpt_set_backlight;
  1736.                 panel->backlight.get = lpt_get_backlight;
  1737.                 if (HAS_PCH_LPT(dev))
  1738.                         panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
  1739.                 else
  1740.                         panel->backlight.hz_to_pwm = spt_hz_to_pwm;
  1741.         } else if (HAS_PCH_SPLIT(dev)) {
  1742.                 panel->backlight.setup = pch_setup_backlight;
  1743.                 panel->backlight.enable = pch_enable_backlight;
  1744.                 panel->backlight.disable = pch_disable_backlight;
  1745.                 panel->backlight.set = pch_set_backlight;
  1746.                 panel->backlight.get = pch_get_backlight;
  1747.                 panel->backlight.hz_to_pwm = pch_hz_to_pwm;
  1748.         } else if (IS_VALLEYVIEW(dev)) {
  1749.                 if (dev_priv->vbt.has_mipi) {
  1750.                         panel->backlight.setup = pwm_setup_backlight;
  1751.                         panel->backlight.enable = pwm_enable_backlight;
  1752.                         panel->backlight.disable = pwm_disable_backlight;
  1753.                         panel->backlight.set = pwm_set_backlight;
  1754.                         panel->backlight.get = pwm_get_backlight;
  1755.                 } else {
  1756.                         panel->backlight.setup = vlv_setup_backlight;
  1757.                         panel->backlight.enable = vlv_enable_backlight;
  1758.                         panel->backlight.disable = vlv_disable_backlight;
  1759.                         panel->backlight.set = vlv_set_backlight;
  1760.                         panel->backlight.get = vlv_get_backlight;
  1761.                         panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
  1762.                 }
  1763.         } else if (IS_GEN4(dev)) {
  1764.                 panel->backlight.setup = i965_setup_backlight;
  1765.                 panel->backlight.enable = i965_enable_backlight;
  1766.                 panel->backlight.disable = i965_disable_backlight;
  1767.                 panel->backlight.set = i9xx_set_backlight;
  1768.                 panel->backlight.get = i9xx_get_backlight;
  1769.                 panel->backlight.hz_to_pwm = i965_hz_to_pwm;
  1770.         } else {
  1771.                 panel->backlight.setup = i9xx_setup_backlight;
  1772.                 panel->backlight.enable = i9xx_enable_backlight;
  1773.                 panel->backlight.disable = i9xx_disable_backlight;
  1774.                 panel->backlight.set = i9xx_set_backlight;
  1775.                 panel->backlight.get = i9xx_get_backlight;
  1776.                 panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
  1777.         }
  1778. }
  1779.  
  1780. int intel_panel_init(struct intel_panel *panel,
  1781.                      struct drm_display_mode *fixed_mode,
  1782.                      struct drm_display_mode *downclock_mode)
  1783. {
  1784.         intel_panel_init_backlight_funcs(panel);
  1785.  
  1786.         panel->fixed_mode = fixed_mode;
  1787.         panel->downclock_mode = downclock_mode;
  1788.  
  1789.         return 0;
  1790. }
  1791.  
  1792. void intel_panel_fini(struct intel_panel *panel)
  1793. {
  1794.         struct intel_connector *intel_connector =
  1795.                 container_of(panel, struct intel_connector, panel);
  1796.  
  1797.         if (panel->fixed_mode)
  1798.                 drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
  1799.  
  1800.         if (panel->downclock_mode)
  1801.                 drm_mode_destroy(intel_connector->base.dev,
  1802.                                 panel->downclock_mode);
  1803. }
  1804.  
  1805. void intel_backlight_register(struct drm_device *dev)
  1806. {
  1807.         struct intel_connector *connector;
  1808.  
  1809.         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
  1810.                 intel_backlight_device_register(connector);
  1811. }
  1812.  
  1813. void intel_backlight_unregister(struct drm_device *dev)
  1814. {
  1815.         struct intel_connector *connector;
  1816.  
  1817.         list_for_each_entry(connector, &dev->mode_config.connector_list, base.head)
  1818.                 intel_backlight_device_unregister(connector);
  1819. }
  1820.