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  1. /*
  2.  * Copyright © 1997-2003 by The XFree86 Project, Inc.
  3.  * Copyright © 2007 Dave Airlie
  4.  * Copyright © 2007-2008 Intel Corporation
  5.  *   Jesse Barnes <jesse.barnes@intel.com>
  6.  * Copyright 2005-2006 Luc Verhaegen
  7.  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
  8.  *
  9.  * Permission is hereby granted, free of charge, to any person obtaining a
  10.  * copy of this software and associated documentation files (the "Software"),
  11.  * to deal in the Software without restriction, including without limitation
  12.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13.  * and/or sell copies of the Software, and to permit persons to whom the
  14.  * Software is furnished to do so, subject to the following conditions:
  15.  *
  16.  * The above copyright notice and this permission notice shall be included in
  17.  * all copies or substantial portions of the Software.
  18.  *
  19.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25.  * OTHER DEALINGS IN THE SOFTWARE.
  26.  *
  27.  * Except as contained in this notice, the name of the copyright holder(s)
  28.  * and author(s) shall not be used in advertising or otherwise to promote
  29.  * the sale, use or other dealings in this Software without prior written
  30.  * authorization from the copyright holder(s) and author(s).
  31.  */
  32.  
  33. #include <linux/list.h>
  34. #include <linux/list_sort.h>
  35. #include <linux/export.h>
  36. #include <drm/drmP.h>
  37. #include <drm/drm_crtc.h>
  38. #include <drm/drm_modes.h>
  39.  
  40. #include "drm_crtc_internal.h"
  41.  
  42. /**
  43.  * drm_mode_debug_printmodeline - print a mode to dmesg
  44.  * @mode: mode to print
  45.  *
  46.  * Describe @mode using DRM_DEBUG.
  47.  */
  48. void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  49. {
  50.         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  51.                         "0x%x 0x%x\n",
  52.                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  53.                 mode->hdisplay, mode->hsync_start,
  54.                 mode->hsync_end, mode->htotal,
  55.                 mode->vdisplay, mode->vsync_start,
  56.                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  57. }
  58. EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  59.  
  60. /**
  61.  * drm_mode_create - create a new display mode
  62.  * @dev: DRM device
  63.  *
  64.  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
  65.  * and return it.
  66.  *
  67.  * Returns:
  68.  * Pointer to new mode on success, NULL on error.
  69.  */
  70. struct drm_display_mode *drm_mode_create(struct drm_device *dev)
  71. {
  72.         struct drm_display_mode *nmode;
  73.  
  74.         nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
  75.         if (!nmode)
  76.                 return NULL;
  77.  
  78.         if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
  79.                 kfree(nmode);
  80.                 return NULL;
  81.         }
  82.  
  83.         return nmode;
  84. }
  85. EXPORT_SYMBOL(drm_mode_create);
  86.  
  87. /**
  88.  * drm_mode_destroy - remove a mode
  89.  * @dev: DRM device
  90.  * @mode: mode to remove
  91.  *
  92.  * Release @mode's unique ID, then free it @mode structure itself using kfree.
  93.  */
  94. void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
  95. {
  96.         if (!mode)
  97.                 return;
  98.  
  99.         drm_mode_object_put(dev, &mode->base);
  100.  
  101.         kfree(mode);
  102. }
  103. EXPORT_SYMBOL(drm_mode_destroy);
  104.  
  105. /**
  106.  * drm_mode_probed_add - add a mode to a connector's probed_mode list
  107.  * @connector: connector the new mode
  108.  * @mode: mode data
  109.  *
  110.  * Add @mode to @connector's probed_mode list for later use. This list should
  111.  * then in a second step get filtered and all the modes actually supported by
  112.  * the hardware moved to the @connector's modes list.
  113.  */
  114. void drm_mode_probed_add(struct drm_connector *connector,
  115.                          struct drm_display_mode *mode)
  116. {
  117.         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
  118.  
  119.         list_add_tail(&mode->head, &connector->probed_modes);
  120. }
  121. EXPORT_SYMBOL(drm_mode_probed_add);
  122.  
  123. /**
  124.  * drm_cvt_mode -create a modeline based on the CVT algorithm
  125.  * @dev: drm device
  126.  * @hdisplay: hdisplay size
  127.  * @vdisplay: vdisplay size
  128.  * @vrefresh: vrefresh rate
  129.  * @reduced: whether to use reduced blanking
  130.  * @interlaced: whether to compute an interlaced mode
  131.  * @margins: whether to add margins (borders)
  132.  *
  133.  * This function is called to generate the modeline based on CVT algorithm
  134.  * according to the hdisplay, vdisplay, vrefresh.
  135.  * It is based from the VESA(TM) Coordinated Video Timing Generator by
  136.  * Graham Loveridge April 9, 2003 available at
  137.  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
  138.  *
  139.  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
  140.  * What I have done is to translate it by using integer calculation.
  141.  *
  142.  * Returns:
  143.  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
  144.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  145.  * when no mode could be allocated.
  146.  */
  147. struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
  148.                                       int vdisplay, int vrefresh,
  149.                                       bool reduced, bool interlaced, bool margins)
  150. {
  151. #define HV_FACTOR                       1000
  152.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  153. #define CVT_MARGIN_PERCENTAGE           18
  154.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  155. #define CVT_H_GRANULARITY               8
  156.         /* 3) Minimum vertical porch (lines) - default 3 */
  157. #define CVT_MIN_V_PORCH                 3
  158.         /* 4) Minimum number of vertical back porch lines - default 6 */
  159. #define CVT_MIN_V_BPORCH                6
  160.         /* Pixel Clock step (kHz) */
  161. #define CVT_CLOCK_STEP                  250
  162.         struct drm_display_mode *drm_mode;
  163.         unsigned int vfieldrate, hperiod;
  164.         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
  165.         int interlace;
  166.  
  167.         /* allocate the drm_display_mode structure. If failure, we will
  168.          * return directly
  169.          */
  170.         drm_mode = drm_mode_create(dev);
  171.         if (!drm_mode)
  172.                 return NULL;
  173.  
  174.         /* the CVT default refresh rate is 60Hz */
  175.         if (!vrefresh)
  176.                 vrefresh = 60;
  177.  
  178.         /* the required field fresh rate */
  179.         if (interlaced)
  180.                 vfieldrate = vrefresh * 2;
  181.         else
  182.                 vfieldrate = vrefresh;
  183.  
  184.         /* horizontal pixels */
  185.         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
  186.  
  187.         /* determine the left&right borders */
  188.         hmargin = 0;
  189.         if (margins) {
  190.                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  191.                 hmargin -= hmargin % CVT_H_GRANULARITY;
  192.         }
  193.         /* find the total active pixels */
  194.         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
  195.  
  196.         /* find the number of lines per field */
  197.         if (interlaced)
  198.                 vdisplay_rnd = vdisplay / 2;
  199.         else
  200.                 vdisplay_rnd = vdisplay;
  201.  
  202.         /* find the top & bottom borders */
  203.         vmargin = 0;
  204.         if (margins)
  205.                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  206.  
  207.         drm_mode->vdisplay = vdisplay + 2 * vmargin;
  208.  
  209.         /* Interlaced */
  210.         if (interlaced)
  211.                 interlace = 1;
  212.         else
  213.                 interlace = 0;
  214.  
  215.         /* Determine VSync Width from aspect ratio */
  216.         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
  217.                 vsync = 4;
  218.         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
  219.                 vsync = 5;
  220.         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
  221.                 vsync = 6;
  222.         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
  223.                 vsync = 7;
  224.         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
  225.                 vsync = 7;
  226.         else /* custom */
  227.                 vsync = 10;
  228.  
  229.         if (!reduced) {
  230.                 /* simplify the GTF calculation */
  231.                 /* 4) Minimum time of vertical sync + back porch interval (µs)
  232.                  * default 550.0
  233.                  */
  234.                 int tmp1, tmp2;
  235. #define CVT_MIN_VSYNC_BP        550
  236.                 /* 3) Nominal HSync width (% of line period) - default 8 */
  237. #define CVT_HSYNC_PERCENTAGE    8
  238.                 unsigned int hblank_percentage;
  239.                 int vsyncandback_porch, vback_porch, hblank;
  240.  
  241.                 /* estimated the horizontal period */
  242.                 tmp1 = HV_FACTOR * 1000000  -
  243.                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
  244.                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
  245.                                 interlace;
  246.                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
  247.  
  248.                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
  249.                 /* 9. Find number of lines in sync + backporch */
  250.                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
  251.                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
  252.                 else
  253.                         vsyncandback_porch = tmp1;
  254.                 /* 10. Find number of lines in back porch */
  255.                 vback_porch = vsyncandback_porch - vsync;
  256.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
  257.                                 vsyncandback_porch + CVT_MIN_V_PORCH;
  258.                 /* 5) Definition of Horizontal blanking time limitation */
  259.                 /* Gradient (%/kHz) - default 600 */
  260. #define CVT_M_FACTOR    600
  261.                 /* Offset (%) - default 40 */
  262. #define CVT_C_FACTOR    40
  263.                 /* Blanking time scaling factor - default 128 */
  264. #define CVT_K_FACTOR    128
  265.                 /* Scaling factor weighting - default 20 */
  266. #define CVT_J_FACTOR    20
  267. #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
  268. #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
  269.                          CVT_J_FACTOR)
  270.                 /* 12. Find ideal blanking duty cycle from formula */
  271.                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
  272.                                         hperiod / 1000;
  273.                 /* 13. Blanking time */
  274.                 if (hblank_percentage < 20 * HV_FACTOR)
  275.                         hblank_percentage = 20 * HV_FACTOR;
  276.                 hblank = drm_mode->hdisplay * hblank_percentage /
  277.                          (100 * HV_FACTOR - hblank_percentage);
  278.                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
  279.                 /* 14. find the total pixes per line */
  280.                 drm_mode->htotal = drm_mode->hdisplay + hblank;
  281.                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
  282.                 drm_mode->hsync_start = drm_mode->hsync_end -
  283.                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
  284.                 drm_mode->hsync_start += CVT_H_GRANULARITY -
  285.                         drm_mode->hsync_start % CVT_H_GRANULARITY;
  286.                 /* fill the Vsync values */
  287.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
  288.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  289.         } else {
  290.                 /* Reduced blanking */
  291.                 /* Minimum vertical blanking interval time (µs)- default 460 */
  292. #define CVT_RB_MIN_VBLANK       460
  293.                 /* Fixed number of clocks for horizontal sync */
  294. #define CVT_RB_H_SYNC           32
  295.                 /* Fixed number of clocks for horizontal blanking */
  296. #define CVT_RB_H_BLANK          160
  297.                 /* Fixed number of lines for vertical front porch - default 3*/
  298. #define CVT_RB_VFPORCH          3
  299.                 int vbilines;
  300.                 int tmp1, tmp2;
  301.                 /* 8. Estimate Horizontal period. */
  302.                 tmp1 = HV_FACTOR * 1000000 -
  303.                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
  304.                 tmp2 = vdisplay_rnd + 2 * vmargin;
  305.                 hperiod = tmp1 / (tmp2 * vfieldrate);
  306.                 /* 9. Find number of lines in vertical blanking */
  307.                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
  308.                 /* 10. Check if vertical blanking is sufficient */
  309.                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
  310.                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
  311.                 /* 11. Find total number of lines in vertical field */
  312.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
  313.                 /* 12. Find total number of pixels in a line */
  314.                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
  315.                 /* Fill in HSync values */
  316.                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
  317.                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
  318.                 /* Fill in VSync values */
  319.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
  320.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  321.         }
  322.         /* 15/13. Find pixel clock frequency (kHz for xf86) */
  323.         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
  324.         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
  325.         /* 18/16. Find actual vertical frame frequency */
  326.         /* ignore - just set the mode flag for interlaced */
  327.         if (interlaced) {
  328.                 drm_mode->vtotal *= 2;
  329.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  330.         }
  331.         /* Fill the mode line name */
  332.         drm_mode_set_name(drm_mode);
  333.         if (reduced)
  334.                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
  335.                                         DRM_MODE_FLAG_NVSYNC);
  336.         else
  337.                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
  338.                                         DRM_MODE_FLAG_NHSYNC);
  339.  
  340.     return drm_mode;
  341. }
  342. EXPORT_SYMBOL(drm_cvt_mode);
  343.  
  344. /**
  345.  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
  346.  * @dev: drm device
  347.  * @hdisplay: hdisplay size
  348.  * @vdisplay: vdisplay size
  349.  * @vrefresh: vrefresh rate.
  350.  * @interlaced: whether to compute an interlaced mode
  351.  * @margins: desired margin (borders) size
  352.  * @GTF_M: extended GTF formula parameters
  353.  * @GTF_2C: extended GTF formula parameters
  354.  * @GTF_K: extended GTF formula parameters
  355.  * @GTF_2J: extended GTF formula parameters
  356.  *
  357.  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
  358.  * in here multiplied by two.  For a C of 40, pass in 80.
  359.  *
  360.  * Returns:
  361.  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
  362.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  363.  * when no mode could be allocated.
  364.  */
  365. struct drm_display_mode *
  366. drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
  367.                      int vrefresh, bool interlaced, int margins,
  368.                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
  369. {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
  370. #define GTF_MARGIN_PERCENTAGE           18
  371.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  372. #define GTF_CELL_GRAN                   8
  373.         /* 3) Minimum vertical porch (lines) - default 3 */
  374. #define GTF_MIN_V_PORCH                 1
  375.         /* width of vsync in lines */
  376. #define V_SYNC_RQD                      3
  377.         /* width of hsync as % of total line */
  378. #define H_SYNC_PERCENT                  8
  379.         /* min time of vsync + back porch (microsec) */
  380. #define MIN_VSYNC_PLUS_BP               550
  381.         /* C' and M' are part of the Blanking Duty Cycle computation */
  382. #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
  383. #define GTF_M_PRIME             (GTF_K * GTF_M / 256)
  384.         struct drm_display_mode *drm_mode;
  385.         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
  386.         int top_margin, bottom_margin;
  387.         int interlace;
  388.         unsigned int hfreq_est;
  389.         int vsync_plus_bp, vback_porch;
  390.         unsigned int vtotal_lines, vfieldrate_est, hperiod;
  391.         unsigned int vfield_rate, vframe_rate;
  392.         int left_margin, right_margin;
  393.         unsigned int total_active_pixels, ideal_duty_cycle;
  394.         unsigned int hblank, total_pixels, pixel_freq;
  395.         int hsync, hfront_porch, vodd_front_porch_lines;
  396.         unsigned int tmp1, tmp2;
  397.  
  398.         drm_mode = drm_mode_create(dev);
  399.         if (!drm_mode)
  400.                 return NULL;
  401.  
  402.         /* 1. In order to give correct results, the number of horizontal
  403.          * pixels requested is first processed to ensure that it is divisible
  404.          * by the character size, by rounding it to the nearest character
  405.          * cell boundary:
  406.          */
  407.         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  408.         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
  409.  
  410.         /* 2. If interlace is requested, the number of vertical lines assumed
  411.          * by the calculation must be halved, as the computation calculates
  412.          * the number of vertical lines per field.
  413.          */
  414.         if (interlaced)
  415.                 vdisplay_rnd = vdisplay / 2;
  416.         else
  417.                 vdisplay_rnd = vdisplay;
  418.  
  419.         /* 3. Find the frame rate required: */
  420.         if (interlaced)
  421.                 vfieldrate_rqd = vrefresh * 2;
  422.         else
  423.                 vfieldrate_rqd = vrefresh;
  424.  
  425.         /* 4. Find number of lines in Top margin: */
  426.         top_margin = 0;
  427.         if (margins)
  428.                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  429.                                 1000;
  430.         /* 5. Find number of lines in bottom margin: */
  431.         bottom_margin = top_margin;
  432.  
  433.         /* 6. If interlace is required, then set variable interlace: */
  434.         if (interlaced)
  435.                 interlace = 1;
  436.         else
  437.                 interlace = 0;
  438.  
  439.         /* 7. Estimate the Horizontal frequency */
  440.         {
  441.                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
  442.                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
  443.                                 2 + interlace;
  444.                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
  445.         }
  446.  
  447.         /* 8. Find the number of lines in V sync + back porch */
  448.         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
  449.         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
  450.         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
  451.         /*  9. Find the number of lines in V back porch alone: */
  452.         vback_porch = vsync_plus_bp - V_SYNC_RQD;
  453.         /*  10. Find the total number of lines in Vertical field period: */
  454.         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
  455.                         vsync_plus_bp + GTF_MIN_V_PORCH;
  456.         /*  11. Estimate the Vertical field frequency: */
  457.         vfieldrate_est = hfreq_est / vtotal_lines;
  458.         /*  12. Find the actual horizontal period: */
  459.         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
  460.  
  461.         /*  13. Find the actual Vertical field frequency: */
  462.         vfield_rate = hfreq_est / vtotal_lines;
  463.         /*  14. Find the Vertical frame frequency: */
  464.         if (interlaced)
  465.                 vframe_rate = vfield_rate / 2;
  466.         else
  467.                 vframe_rate = vfield_rate;
  468.         /*  15. Find number of pixels in left margin: */
  469.         if (margins)
  470.                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  471.                                 1000;
  472.         else
  473.                 left_margin = 0;
  474.  
  475.         /* 16.Find number of pixels in right margin: */
  476.         right_margin = left_margin;
  477.         /* 17.Find total number of active pixels in image and left and right */
  478.         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
  479.         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
  480.         ideal_duty_cycle = GTF_C_PRIME * 1000 -
  481.                                 (GTF_M_PRIME * 1000000 / hfreq_est);
  482.         /* 19.Find the number of pixels in the blanking time to the nearest
  483.          * double character cell: */
  484.         hblank = total_active_pixels * ideal_duty_cycle /
  485.                         (100000 - ideal_duty_cycle);
  486.         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
  487.         hblank = hblank * 2 * GTF_CELL_GRAN;
  488.         /* 20.Find total number of pixels: */
  489.         total_pixels = total_active_pixels + hblank;
  490.         /* 21.Find pixel clock frequency: */
  491.         pixel_freq = total_pixels * hfreq_est / 1000;
  492.         /* Stage 1 computations are now complete; I should really pass
  493.          * the results to another function and do the Stage 2 computations,
  494.          * but I only need a few more values so I'll just append the
  495.          * computations here for now */
  496.         /* 17. Find the number of pixels in the horizontal sync period: */
  497.         hsync = H_SYNC_PERCENT * total_pixels / 100;
  498.         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  499.         hsync = hsync * GTF_CELL_GRAN;
  500.         /* 18. Find the number of pixels in horizontal front porch period */
  501.         hfront_porch = hblank / 2 - hsync;
  502.         /*  36. Find the number of lines in the odd front porch period: */
  503.         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
  504.  
  505.         /* finally, pack the results in the mode struct */
  506.         drm_mode->hdisplay = hdisplay_rnd;
  507.         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
  508.         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
  509.         drm_mode->htotal = total_pixels;
  510.         drm_mode->vdisplay = vdisplay_rnd;
  511.         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
  512.         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
  513.         drm_mode->vtotal = vtotal_lines;
  514.  
  515.         drm_mode->clock = pixel_freq;
  516.  
  517.         if (interlaced) {
  518.                 drm_mode->vtotal *= 2;
  519.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  520.         }
  521.  
  522.         drm_mode_set_name(drm_mode);
  523.         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
  524.                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
  525.         else
  526.                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
  527.  
  528.         return drm_mode;
  529. }
  530. EXPORT_SYMBOL(drm_gtf_mode_complex);
  531.  
  532. /**
  533.  * drm_gtf_mode - create the modeline based on the GTF algorithm
  534.  * @dev: drm device
  535.  * @hdisplay: hdisplay size
  536.  * @vdisplay: vdisplay size
  537.  * @vrefresh: vrefresh rate.
  538.  * @interlaced: whether to compute an interlaced mode
  539.  * @margins: desired margin (borders) size
  540.  *
  541.  * return the modeline based on GTF algorithm
  542.  *
  543.  * This function is to create the modeline based on the GTF algorithm.
  544.  * Generalized Timing Formula is derived from:
  545.  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  546.  *      available at http://www.vesa.org
  547.  *
  548.  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
  549.  * What I have done is to translate it by using integer calculation.
  550.  * I also refer to the function of fb_get_mode in the file of
  551.  * drivers/video/fbmon.c
  552.  *
  553.  * Standard GTF parameters:
  554.  * M = 600
  555.  * C = 40
  556.  * K = 128
  557.  * J = 20
  558.  *
  559.  * Returns:
  560.  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
  561.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  562.  * when no mode could be allocated.
  563.  */
  564. struct drm_display_mode *
  565. drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
  566.              bool interlaced, int margins)
  567. {
  568.         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
  569.                                     interlaced, margins,
  570.                                     600, 40 * 2, 128, 20 * 2);
  571. }
  572. EXPORT_SYMBOL(drm_gtf_mode);
  573.  
  574. #ifdef CONFIG_VIDEOMODE_HELPERS
  575. /**
  576.  * drm_display_mode_from_videomode - fill in @dmode using @vm,
  577.  * @vm: videomode structure to use as source
  578.  * @dmode: drm_display_mode structure to use as destination
  579.  *
  580.  * Fills out @dmode using the display mode specified in @vm.
  581.  */
  582. void drm_display_mode_from_videomode(const struct videomode *vm,
  583.                                     struct drm_display_mode *dmode)
  584. {
  585.         dmode->hdisplay = vm->hactive;
  586.         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
  587.         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
  588.         dmode->htotal = dmode->hsync_end + vm->hback_porch;
  589.  
  590.         dmode->vdisplay = vm->vactive;
  591.         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
  592.         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
  593.         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
  594.  
  595.         dmode->clock = vm->pixelclock / 1000;
  596.  
  597.         dmode->flags = 0;
  598.         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
  599.                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
  600.         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
  601.                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
  602.         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
  603.                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
  604.         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
  605.                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
  606.         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
  607.                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
  608.         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
  609.                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
  610.         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
  611.                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
  612.         drm_mode_set_name(dmode);
  613. }
  614. EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
  615.  
  616. #ifdef CONFIG_OF
  617. /**
  618.  * of_get_drm_display_mode - get a drm_display_mode from devicetree
  619.  * @np: device_node with the timing specification
  620.  * @dmode: will be set to the return value
  621.  * @index: index into the list of display timings in devicetree
  622.  *
  623.  * This function is expensive and should only be used, if only one mode is to be
  624.  * read from DT. To get multiple modes start with of_get_display_timings and
  625.  * work with that instead.
  626.  *
  627.  * Returns:
  628.  * 0 on success, a negative errno code when no of videomode node was found.
  629.  */
  630. int of_get_drm_display_mode(struct device_node *np,
  631.                             struct drm_display_mode *dmode, int index)
  632. {
  633.         struct videomode vm;
  634.         int ret;
  635.  
  636.         ret = of_get_videomode(np, &vm, index);
  637.         if (ret)
  638.                 return ret;
  639.  
  640.         drm_display_mode_from_videomode(&vm, dmode);
  641.  
  642.         pr_debug("%s: got %dx%d display mode from %s\n",
  643.                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
  644.         drm_mode_debug_printmodeline(dmode);
  645.  
  646.         return 0;
  647. }
  648. EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
  649. #endif /* CONFIG_OF */
  650. #endif /* CONFIG_VIDEOMODE_HELPERS */
  651.  
  652. /**
  653.  * drm_mode_set_name - set the name on a mode
  654.  * @mode: name will be set in this mode
  655.  *
  656.  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
  657.  * with an optional 'i' suffix for interlaced modes.
  658.  */
  659. void drm_mode_set_name(struct drm_display_mode *mode)
  660. {
  661.         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  662.  
  663.         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
  664.                  mode->hdisplay, mode->vdisplay,
  665.                  interlaced ? "i" : "");
  666. }
  667. EXPORT_SYMBOL(drm_mode_set_name);
  668.  
  669. /** drm_mode_hsync - get the hsync of a mode
  670.  * @mode: mode
  671.  *
  672.  * Returns:
  673.  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
  674.  * value first if it is not yet set.
  675.  */
  676. int drm_mode_hsync(const struct drm_display_mode *mode)
  677. {
  678.         unsigned int calc_val;
  679.  
  680.         if (mode->hsync)
  681.                 return mode->hsync;
  682.  
  683.         if (mode->htotal < 0)
  684.                 return 0;
  685.  
  686.         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
  687.         calc_val += 500;                                /* round to 1000Hz */
  688.         calc_val /= 1000;                               /* truncate to kHz */
  689.  
  690.         return calc_val;
  691. }
  692. EXPORT_SYMBOL(drm_mode_hsync);
  693.  
  694. /**
  695.  * drm_mode_vrefresh - get the vrefresh of a mode
  696.  * @mode: mode
  697.  *
  698.  * Returns:
  699.  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
  700.  * value first if it is not yet set.
  701.  */
  702. int drm_mode_vrefresh(const struct drm_display_mode *mode)
  703. {
  704.         int refresh = 0;
  705.         unsigned int calc_val;
  706.  
  707.         if (mode->vrefresh > 0)
  708.                 refresh = mode->vrefresh;
  709.         else if (mode->htotal > 0 && mode->vtotal > 0) {
  710.                 int vtotal;
  711.                 vtotal = mode->vtotal;
  712.                 /* work out vrefresh the value will be x1000 */
  713.                 calc_val = (mode->clock * 1000);
  714.                 calc_val /= mode->htotal;
  715.                 refresh = (calc_val + vtotal / 2) / vtotal;
  716.  
  717.                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  718.                         refresh *= 2;
  719.                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  720.                         refresh /= 2;
  721.                 if (mode->vscan > 1)
  722.                         refresh /= mode->vscan;
  723.         }
  724.         return refresh;
  725. }
  726. EXPORT_SYMBOL(drm_mode_vrefresh);
  727.  
  728. /**
  729.  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
  730.  * @p: mode
  731.  * @adjust_flags: a combination of adjustment flags
  732.  *
  733.  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
  734.  *
  735.  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
  736.  *   interlaced modes.
  737.  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
  738.  *   buffers containing two eyes (only adjust the timings when needed, eg. for
  739.  *   "frame packing" or "side by side full").
  740.  */
  741. void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
  742. {
  743.         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
  744.                 return;
  745.  
  746.         p->crtc_clock = p->clock;
  747.         p->crtc_hdisplay = p->hdisplay;
  748.         p->crtc_hsync_start = p->hsync_start;
  749.         p->crtc_hsync_end = p->hsync_end;
  750.         p->crtc_htotal = p->htotal;
  751.         p->crtc_hskew = p->hskew;
  752.         p->crtc_vdisplay = p->vdisplay;
  753.         p->crtc_vsync_start = p->vsync_start;
  754.         p->crtc_vsync_end = p->vsync_end;
  755.         p->crtc_vtotal = p->vtotal;
  756.  
  757.         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
  758.                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
  759.                         p->crtc_vdisplay /= 2;
  760.                         p->crtc_vsync_start /= 2;
  761.                         p->crtc_vsync_end /= 2;
  762.                         p->crtc_vtotal /= 2;
  763.                 }
  764.         }
  765.  
  766.         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
  767.                 p->crtc_vdisplay *= 2;
  768.                 p->crtc_vsync_start *= 2;
  769.                 p->crtc_vsync_end *= 2;
  770.                 p->crtc_vtotal *= 2;
  771.         }
  772.  
  773.         if (p->vscan > 1) {
  774.                 p->crtc_vdisplay *= p->vscan;
  775.                 p->crtc_vsync_start *= p->vscan;
  776.                 p->crtc_vsync_end *= p->vscan;
  777.                 p->crtc_vtotal *= p->vscan;
  778.         }
  779.  
  780.         if (adjust_flags & CRTC_STEREO_DOUBLE) {
  781.                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
  782.  
  783.                 switch (layout) {
  784.                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
  785.                         p->crtc_clock *= 2;
  786.                         p->crtc_vdisplay += p->crtc_vtotal;
  787.                         p->crtc_vsync_start += p->crtc_vtotal;
  788.                         p->crtc_vsync_end += p->crtc_vtotal;
  789.                         p->crtc_vtotal += p->crtc_vtotal;
  790.                         break;
  791.                 }
  792.         }
  793.  
  794.         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
  795.         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
  796.         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
  797.         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
  798. }
  799. EXPORT_SYMBOL(drm_mode_set_crtcinfo);
  800.  
  801. /**
  802.  * drm_mode_copy - copy the mode
  803.  * @dst: mode to overwrite
  804.  * @src: mode to copy
  805.  *
  806.  * Copy an existing mode into another mode, preserving the object id and
  807.  * list head of the destination mode.
  808.  */
  809. void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
  810. {
  811.         int id = dst->base.id;
  812.         struct list_head head = dst->head;
  813.  
  814.         *dst = *src;
  815.         dst->base.id = id;
  816.         dst->head = head;
  817. }
  818. EXPORT_SYMBOL(drm_mode_copy);
  819.  
  820. /**
  821.  * drm_mode_duplicate - allocate and duplicate an existing mode
  822.  * @dev: drm_device to allocate the duplicated mode for
  823.  * @mode: mode to duplicate
  824.  *
  825.  * Just allocate a new mode, copy the existing mode into it, and return
  826.  * a pointer to it.  Used to create new instances of established modes.
  827.  *
  828.  * Returns:
  829.  * Pointer to duplicated mode on success, NULL on error.
  830.  */
  831. struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
  832.                                             const struct drm_display_mode *mode)
  833. {
  834.         struct drm_display_mode *nmode;
  835.  
  836.         nmode = drm_mode_create(dev);
  837.         if (!nmode)
  838.                 return NULL;
  839.  
  840.         drm_mode_copy(nmode, mode);
  841.  
  842.         return nmode;
  843. }
  844. EXPORT_SYMBOL(drm_mode_duplicate);
  845.  
  846. /**
  847.  * drm_mode_equal - test modes for equality
  848.  * @mode1: first mode
  849.  * @mode2: second mode
  850.  *
  851.  * Check to see if @mode1 and @mode2 are equivalent.
  852.  *
  853.  * Returns:
  854.  * True if the modes are equal, false otherwise.
  855.  */
  856. bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
  857. {
  858.         /* do clock check convert to PICOS so fb modes get matched
  859.          * the same */
  860.         if (mode1->clock && mode2->clock) {
  861.                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
  862.                         return false;
  863.         } else if (mode1->clock != mode2->clock)
  864.                 return false;
  865.  
  866.         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
  867.             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
  868.                 return false;
  869.  
  870.         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
  871. }
  872. EXPORT_SYMBOL(drm_mode_equal);
  873.  
  874. /**
  875.  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
  876.  * @mode1: first mode
  877.  * @mode2: second mode
  878.  *
  879.  * Check to see if @mode1 and @mode2 are equivalent, but
  880.  * don't check the pixel clocks nor the stereo layout.
  881.  *
  882.  * Returns:
  883.  * True if the modes are equal, false otherwise.
  884.  */
  885. bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
  886.                                         const struct drm_display_mode *mode2)
  887. {
  888.         if (mode1->hdisplay == mode2->hdisplay &&
  889.             mode1->hsync_start == mode2->hsync_start &&
  890.             mode1->hsync_end == mode2->hsync_end &&
  891.             mode1->htotal == mode2->htotal &&
  892.             mode1->hskew == mode2->hskew &&
  893.             mode1->vdisplay == mode2->vdisplay &&
  894.             mode1->vsync_start == mode2->vsync_start &&
  895.             mode1->vsync_end == mode2->vsync_end &&
  896.             mode1->vtotal == mode2->vtotal &&
  897.             mode1->vscan == mode2->vscan &&
  898.             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
  899.              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
  900.                 return true;
  901.  
  902.         return false;
  903. }
  904. EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
  905.  
  906. /**
  907.  * drm_mode_validate_size - make sure modes adhere to size constraints
  908.  * @dev: DRM device
  909.  * @mode_list: list of modes to check
  910.  * @maxX: maximum width
  911.  * @maxY: maximum height
  912.  *
  913.  * This function is a helper which can be used to validate modes against size
  914.  * limitations of the DRM device/connector. If a mode is too big its status
  915.  * member is updated with the appropriate validation failure code. The list
  916.  * itself is not changed.
  917.  */
  918. void drm_mode_validate_size(struct drm_device *dev,
  919.                             struct list_head *mode_list,
  920.                             int maxX, int maxY)
  921. {
  922.         struct drm_display_mode *mode;
  923.  
  924.         list_for_each_entry(mode, mode_list, head) {
  925.                 if (maxX > 0 && mode->hdisplay > maxX)
  926.                         mode->status = MODE_VIRTUAL_X;
  927.  
  928.                 if (maxY > 0 && mode->vdisplay > maxY)
  929.                         mode->status = MODE_VIRTUAL_Y;
  930.         }
  931. }
  932. EXPORT_SYMBOL(drm_mode_validate_size);
  933.  
  934. /**
  935.  * drm_mode_prune_invalid - remove invalid modes from mode list
  936.  * @dev: DRM device
  937.  * @mode_list: list of modes to check
  938.  * @verbose: be verbose about it
  939.  *
  940.  * This helper function can be used to prune a display mode list after
  941.  * validation has been completed. All modes who's status is not MODE_OK will be
  942.  * removed from the list, and if @verbose the status code and mode name is also
  943.  * printed to dmesg.
  944.  */
  945. void drm_mode_prune_invalid(struct drm_device *dev,
  946.                             struct list_head *mode_list, bool verbose)
  947. {
  948.         struct drm_display_mode *mode, *t;
  949.  
  950.         list_for_each_entry_safe(mode, t, mode_list, head) {
  951.                 if (mode->status != MODE_OK) {
  952.                         list_del(&mode->head);
  953.                         if (verbose) {
  954.                                 drm_mode_debug_printmodeline(mode);
  955.                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
  956.                                         mode->name, mode->status);
  957.                         }
  958.                         drm_mode_destroy(dev, mode);
  959.                 }
  960.         }
  961. }
  962. EXPORT_SYMBOL(drm_mode_prune_invalid);
  963.  
  964. /**
  965.  * drm_mode_compare - compare modes for favorability
  966.  * @priv: unused
  967.  * @lh_a: list_head for first mode
  968.  * @lh_b: list_head for second mode
  969.  *
  970.  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
  971.  * which is better.
  972.  *
  973.  * Returns:
  974.  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
  975.  * positive if @lh_b is better than @lh_a.
  976.  */
  977. static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
  978. {
  979.         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
  980.         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
  981.         int diff;
  982.  
  983.         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
  984.                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
  985.         if (diff)
  986.                 return diff;
  987.         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
  988.         if (diff)
  989.                 return diff;
  990.  
  991.         diff = b->vrefresh - a->vrefresh;
  992.         if (diff)
  993.                 return diff;
  994.  
  995.         diff = b->clock - a->clock;
  996.         return diff;
  997. }
  998.  
  999. /**
  1000.  * drm_mode_sort - sort mode list
  1001.  * @mode_list: list of drm_display_mode structures to sort
  1002.  *
  1003.  * Sort @mode_list by favorability, moving good modes to the head of the list.
  1004.  */
  1005. void drm_mode_sort(struct list_head *mode_list)
  1006. {
  1007.         list_sort(NULL, mode_list, drm_mode_compare);
  1008. }
  1009. EXPORT_SYMBOL(drm_mode_sort);
  1010.  
  1011. /**
  1012.  * drm_mode_connector_list_update - update the mode list for the connector
  1013.  * @connector: the connector to update
  1014.  * @merge_type_bits: whether to merge or overright type bits.
  1015.  *
  1016.  * This moves the modes from the @connector probed_modes list
  1017.  * to the actual mode list. It compares the probed mode against the current
  1018.  * list and only adds different/new modes.
  1019.  *
  1020.  * This is just a helper functions doesn't validate any modes itself and also
  1021.  * doesn't prune any invalid modes. Callers need to do that themselves.
  1022.  */
  1023. void drm_mode_connector_list_update(struct drm_connector *connector,
  1024.                                     bool merge_type_bits)
  1025. {
  1026.         struct drm_display_mode *mode;
  1027.         struct drm_display_mode *pmode, *pt;
  1028.         int found_it;
  1029.  
  1030.         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
  1031.  
  1032.         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
  1033.                                  head) {
  1034.                 found_it = 0;
  1035.                 /* go through current modes checking for the new probed mode */
  1036.                 list_for_each_entry(mode, &connector->modes, head) {
  1037.                         if (drm_mode_equal(pmode, mode)) {
  1038.                                 found_it = 1;
  1039.                                 /* if equal delete the probed mode */
  1040.                                 mode->status = pmode->status;
  1041.                                 /* Merge type bits together */
  1042.                                 if (merge_type_bits)
  1043.                                 mode->type |= pmode->type;
  1044.                                 else
  1045.                                         mode->type = pmode->type;
  1046.                                 list_del(&pmode->head);
  1047.                                 drm_mode_destroy(connector->dev, pmode);
  1048.                                 break;
  1049.                         }
  1050.                 }
  1051.  
  1052.                 if (!found_it) {
  1053.                         list_move_tail(&pmode->head, &connector->modes);
  1054.                 }
  1055.         }
  1056. }
  1057. EXPORT_SYMBOL(drm_mode_connector_list_update);
  1058.