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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.  
  39. /**
  40.  * drm_mode_debug_printmodeline - debug print a mode
  41.  * @dev: DRM device
  42.  * @mode: mode to print
  43.  *
  44.  * LOCKING:
  45.  * None.
  46.  *
  47.  * Describe @mode using DRM_DEBUG.
  48.  */
  49. void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  50. {
  51.         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  52.                         "0x%x 0x%x\n",
  53.                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  54.                 mode->hdisplay, mode->hsync_start,
  55.                 mode->hsync_end, mode->htotal,
  56.                 mode->vdisplay, mode->vsync_start,
  57.                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  58. }
  59. EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  60.  
  61. /**
  62.  * drm_cvt_mode -create a modeline based on CVT algorithm
  63.  * @dev: DRM device
  64.  * @hdisplay: hdisplay size
  65.  * @vdisplay: vdisplay size
  66.  * @vrefresh  : vrefresh rate
  67.  * @reduced : Whether the GTF calculation is simplified
  68.  * @interlaced:Whether the interlace is supported
  69.  *
  70.  * LOCKING:
  71.  * none.
  72.  *
  73.  * return the modeline based on CVT algorithm
  74.  *
  75.  * This function is called to generate the modeline based on CVT algorithm
  76.  * according to the hdisplay, vdisplay, vrefresh.
  77.  * It is based from the VESA(TM) Coordinated Video Timing Generator by
  78.  * Graham Loveridge April 9, 2003 available at
  79.  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
  80.  *
  81.  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
  82.  * What I have done is to translate it by using integer calculation.
  83.  */
  84. #define HV_FACTOR                       1000
  85. struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
  86.                                       int vdisplay, int vrefresh,
  87.                                       bool reduced, bool interlaced, bool margins)
  88. {
  89.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  90. #define CVT_MARGIN_PERCENTAGE           18
  91.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  92. #define CVT_H_GRANULARITY               8
  93.         /* 3) Minimum vertical porch (lines) - default 3 */
  94. #define CVT_MIN_V_PORCH                 3
  95.         /* 4) Minimum number of vertical back porch lines - default 6 */
  96. #define CVT_MIN_V_BPORCH                6
  97.         /* Pixel Clock step (kHz) */
  98. #define CVT_CLOCK_STEP                  250
  99.         struct drm_display_mode *drm_mode;
  100.         unsigned int vfieldrate, hperiod;
  101.         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
  102.         int interlace;
  103.  
  104.         /* allocate the drm_display_mode structure. If failure, we will
  105.          * return directly
  106.          */
  107.         drm_mode = drm_mode_create(dev);
  108.         if (!drm_mode)
  109.                 return NULL;
  110.  
  111.         /* the CVT default refresh rate is 60Hz */
  112.         if (!vrefresh)
  113.                 vrefresh = 60;
  114.  
  115.         /* the required field fresh rate */
  116.         if (interlaced)
  117.                 vfieldrate = vrefresh * 2;
  118.         else
  119.                 vfieldrate = vrefresh;
  120.  
  121.         /* horizontal pixels */
  122.         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
  123.  
  124.         /* determine the left&right borders */
  125.         hmargin = 0;
  126.         if (margins) {
  127.                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  128.                 hmargin -= hmargin % CVT_H_GRANULARITY;
  129.         }
  130.         /* find the total active pixels */
  131.         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
  132.  
  133.         /* find the number of lines per field */
  134.         if (interlaced)
  135.                 vdisplay_rnd = vdisplay / 2;
  136.         else
  137.                 vdisplay_rnd = vdisplay;
  138.  
  139.         /* find the top & bottom borders */
  140.         vmargin = 0;
  141.         if (margins)
  142.                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  143.  
  144.         drm_mode->vdisplay = vdisplay + 2 * vmargin;
  145.  
  146.         /* Interlaced */
  147.         if (interlaced)
  148.                 interlace = 1;
  149.         else
  150.                 interlace = 0;
  151.  
  152.         /* Determine VSync Width from aspect ratio */
  153.         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
  154.                 vsync = 4;
  155.         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
  156.                 vsync = 5;
  157.         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
  158.                 vsync = 6;
  159.         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
  160.                 vsync = 7;
  161.         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
  162.                 vsync = 7;
  163.         else /* custom */
  164.                 vsync = 10;
  165.  
  166.         if (!reduced) {
  167.                 /* simplify the GTF calculation */
  168.                 /* 4) Minimum time of vertical sync + back porch interval (µs)
  169.                  * default 550.0
  170.                  */
  171.                 int tmp1, tmp2;
  172. #define CVT_MIN_VSYNC_BP        550
  173.                 /* 3) Nominal HSync width (% of line period) - default 8 */
  174. #define CVT_HSYNC_PERCENTAGE    8
  175.                 unsigned int hblank_percentage;
  176.                 int vsyncandback_porch, vback_porch, hblank;
  177.  
  178.                 /* estimated the horizontal period */
  179.                 tmp1 = HV_FACTOR * 1000000  -
  180.                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
  181.                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
  182.                                 interlace;
  183.                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
  184.  
  185.                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
  186.                 /* 9. Find number of lines in sync + backporch */
  187.                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
  188.                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
  189.                 else
  190.                         vsyncandback_porch = tmp1;
  191.                 /* 10. Find number of lines in back porch */
  192.                 vback_porch = vsyncandback_porch - vsync;
  193.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
  194.                                 vsyncandback_porch + CVT_MIN_V_PORCH;
  195.                 /* 5) Definition of Horizontal blanking time limitation */
  196.                 /* Gradient (%/kHz) - default 600 */
  197. #define CVT_M_FACTOR    600
  198.                 /* Offset (%) - default 40 */
  199. #define CVT_C_FACTOR    40
  200.                 /* Blanking time scaling factor - default 128 */
  201. #define CVT_K_FACTOR    128
  202.                 /* Scaling factor weighting - default 20 */
  203. #define CVT_J_FACTOR    20
  204. #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
  205. #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
  206.                          CVT_J_FACTOR)
  207.                 /* 12. Find ideal blanking duty cycle from formula */
  208.                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
  209.                                         hperiod / 1000;
  210.                 /* 13. Blanking time */
  211.                 if (hblank_percentage < 20 * HV_FACTOR)
  212.                         hblank_percentage = 20 * HV_FACTOR;
  213.                 hblank = drm_mode->hdisplay * hblank_percentage /
  214.                          (100 * HV_FACTOR - hblank_percentage);
  215.                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
  216.                 /* 14. find the total pixes per line */
  217.                 drm_mode->htotal = drm_mode->hdisplay + hblank;
  218.                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
  219.                 drm_mode->hsync_start = drm_mode->hsync_end -
  220.                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
  221.                 drm_mode->hsync_start += CVT_H_GRANULARITY -
  222.                         drm_mode->hsync_start % CVT_H_GRANULARITY;
  223.                 /* fill the Vsync values */
  224.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
  225.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  226.         } else {
  227.                 /* Reduced blanking */
  228.                 /* Minimum vertical blanking interval time (µs)- default 460 */
  229. #define CVT_RB_MIN_VBLANK       460
  230.                 /* Fixed number of clocks for horizontal sync */
  231. #define CVT_RB_H_SYNC           32
  232.                 /* Fixed number of clocks for horizontal blanking */
  233. #define CVT_RB_H_BLANK          160
  234.                 /* Fixed number of lines for vertical front porch - default 3*/
  235. #define CVT_RB_VFPORCH          3
  236.                 int vbilines;
  237.                 int tmp1, tmp2;
  238.                 /* 8. Estimate Horizontal period. */
  239.                 tmp1 = HV_FACTOR * 1000000 -
  240.                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
  241.                 tmp2 = vdisplay_rnd + 2 * vmargin;
  242.                 hperiod = tmp1 / (tmp2 * vfieldrate);
  243.                 /* 9. Find number of lines in vertical blanking */
  244.                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
  245.                 /* 10. Check if vertical blanking is sufficient */
  246.                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
  247.                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
  248.                 /* 11. Find total number of lines in vertical field */
  249.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
  250.                 /* 12. Find total number of pixels in a line */
  251.                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
  252.                 /* Fill in HSync values */
  253.                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
  254.                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
  255.                 /* Fill in VSync values */
  256.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
  257.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  258.         }
  259.         /* 15/13. Find pixel clock frequency (kHz for xf86) */
  260.         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
  261.         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
  262.         /* 18/16. Find actual vertical frame frequency */
  263.         /* ignore - just set the mode flag for interlaced */
  264.         if (interlaced) {
  265.                 drm_mode->vtotal *= 2;
  266.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  267.         }
  268.         /* Fill the mode line name */
  269.         drm_mode_set_name(drm_mode);
  270.         if (reduced)
  271.                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
  272.                                         DRM_MODE_FLAG_NVSYNC);
  273.         else
  274.                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
  275.                                         DRM_MODE_FLAG_NHSYNC);
  276.  
  277.     return drm_mode;
  278. }
  279. EXPORT_SYMBOL(drm_cvt_mode);
  280.  
  281. /**
  282.  * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
  283.  *
  284.  * @dev         :drm device
  285.  * @hdisplay    :hdisplay size
  286.  * @vdisplay    :vdisplay size
  287.  * @vrefresh    :vrefresh rate.
  288.  * @interlaced  :whether the interlace is supported
  289.  * @margins     :desired margin size
  290.  * @GTF_[MCKJ]  :extended GTF formula parameters
  291.  *
  292.  * LOCKING.
  293.  * none.
  294.  *
  295.  * return the modeline based on full GTF algorithm.
  296.  *
  297.  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
  298.  * in here multiplied by two.  For a C of 40, pass in 80.
  299.  */
  300. struct drm_display_mode *
  301. drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
  302.                      int vrefresh, bool interlaced, int margins,
  303.                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
  304. {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
  305. #define GTF_MARGIN_PERCENTAGE           18
  306.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  307. #define GTF_CELL_GRAN                   8
  308.         /* 3) Minimum vertical porch (lines) - default 3 */
  309. #define GTF_MIN_V_PORCH                 1
  310.         /* width of vsync in lines */
  311. #define V_SYNC_RQD                      3
  312.         /* width of hsync as % of total line */
  313. #define H_SYNC_PERCENT                  8
  314.         /* min time of vsync + back porch (microsec) */
  315. #define MIN_VSYNC_PLUS_BP               550
  316.         /* C' and M' are part of the Blanking Duty Cycle computation */
  317. #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
  318. #define GTF_M_PRIME             (GTF_K * GTF_M / 256)
  319.         struct drm_display_mode *drm_mode;
  320.         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
  321.         int top_margin, bottom_margin;
  322.         int interlace;
  323.         unsigned int hfreq_est;
  324.         int vsync_plus_bp, vback_porch;
  325.         unsigned int vtotal_lines, vfieldrate_est, hperiod;
  326.         unsigned int vfield_rate, vframe_rate;
  327.         int left_margin, right_margin;
  328.         unsigned int total_active_pixels, ideal_duty_cycle;
  329.         unsigned int hblank, total_pixels, pixel_freq;
  330.         int hsync, hfront_porch, vodd_front_porch_lines;
  331.         unsigned int tmp1, tmp2;
  332.  
  333.         drm_mode = drm_mode_create(dev);
  334.         if (!drm_mode)
  335.                 return NULL;
  336.  
  337.         /* 1. In order to give correct results, the number of horizontal
  338.          * pixels requested is first processed to ensure that it is divisible
  339.          * by the character size, by rounding it to the nearest character
  340.          * cell boundary:
  341.          */
  342.         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  343.         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
  344.  
  345.         /* 2. If interlace is requested, the number of vertical lines assumed
  346.          * by the calculation must be halved, as the computation calculates
  347.          * the number of vertical lines per field.
  348.          */
  349.         if (interlaced)
  350.                 vdisplay_rnd = vdisplay / 2;
  351.         else
  352.                 vdisplay_rnd = vdisplay;
  353.  
  354.         /* 3. Find the frame rate required: */
  355.         if (interlaced)
  356.                 vfieldrate_rqd = vrefresh * 2;
  357.         else
  358.                 vfieldrate_rqd = vrefresh;
  359.  
  360.         /* 4. Find number of lines in Top margin: */
  361.         top_margin = 0;
  362.         if (margins)
  363.                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  364.                                 1000;
  365.         /* 5. Find number of lines in bottom margin: */
  366.         bottom_margin = top_margin;
  367.  
  368.         /* 6. If interlace is required, then set variable interlace: */
  369.         if (interlaced)
  370.                 interlace = 1;
  371.         else
  372.                 interlace = 0;
  373.  
  374.         /* 7. Estimate the Horizontal frequency */
  375.         {
  376.                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
  377.                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
  378.                                 2 + interlace;
  379.                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
  380.         }
  381.  
  382.         /* 8. Find the number of lines in V sync + back porch */
  383.         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
  384.         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
  385.         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
  386.         /*  9. Find the number of lines in V back porch alone: */
  387.         vback_porch = vsync_plus_bp - V_SYNC_RQD;
  388.         /*  10. Find the total number of lines in Vertical field period: */
  389.         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
  390.                         vsync_plus_bp + GTF_MIN_V_PORCH;
  391.         /*  11. Estimate the Vertical field frequency: */
  392.         vfieldrate_est = hfreq_est / vtotal_lines;
  393.         /*  12. Find the actual horizontal period: */
  394.         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
  395.  
  396.         /*  13. Find the actual Vertical field frequency: */
  397.         vfield_rate = hfreq_est / vtotal_lines;
  398.         /*  14. Find the Vertical frame frequency: */
  399.         if (interlaced)
  400.                 vframe_rate = vfield_rate / 2;
  401.         else
  402.                 vframe_rate = vfield_rate;
  403.         /*  15. Find number of pixels in left margin: */
  404.         if (margins)
  405.                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  406.                                 1000;
  407.         else
  408.                 left_margin = 0;
  409.  
  410.         /* 16.Find number of pixels in right margin: */
  411.         right_margin = left_margin;
  412.         /* 17.Find total number of active pixels in image and left and right */
  413.         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
  414.         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
  415.         ideal_duty_cycle = GTF_C_PRIME * 1000 -
  416.                                 (GTF_M_PRIME * 1000000 / hfreq_est);
  417.         /* 19.Find the number of pixels in the blanking time to the nearest
  418.          * double character cell: */
  419.         hblank = total_active_pixels * ideal_duty_cycle /
  420.                         (100000 - ideal_duty_cycle);
  421.         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
  422.         hblank = hblank * 2 * GTF_CELL_GRAN;
  423.         /* 20.Find total number of pixels: */
  424.         total_pixels = total_active_pixels + hblank;
  425.         /* 21.Find pixel clock frequency: */
  426.         pixel_freq = total_pixels * hfreq_est / 1000;
  427.         /* Stage 1 computations are now complete; I should really pass
  428.          * the results to another function and do the Stage 2 computations,
  429.          * but I only need a few more values so I'll just append the
  430.          * computations here for now */
  431.         /* 17. Find the number of pixels in the horizontal sync period: */
  432.         hsync = H_SYNC_PERCENT * total_pixels / 100;
  433.         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  434.         hsync = hsync * GTF_CELL_GRAN;
  435.         /* 18. Find the number of pixels in horizontal front porch period */
  436.         hfront_porch = hblank / 2 - hsync;
  437.         /*  36. Find the number of lines in the odd front porch period: */
  438.         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
  439.  
  440.         /* finally, pack the results in the mode struct */
  441.         drm_mode->hdisplay = hdisplay_rnd;
  442.         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
  443.         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
  444.         drm_mode->htotal = total_pixels;
  445.         drm_mode->vdisplay = vdisplay_rnd;
  446.         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
  447.         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
  448.         drm_mode->vtotal = vtotal_lines;
  449.  
  450.         drm_mode->clock = pixel_freq;
  451.  
  452.         if (interlaced) {
  453.                 drm_mode->vtotal *= 2;
  454.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  455.         }
  456.  
  457.         drm_mode_set_name(drm_mode);
  458.         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
  459.                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
  460.         else
  461.                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
  462.  
  463.         return drm_mode;
  464. }
  465. EXPORT_SYMBOL(drm_gtf_mode_complex);
  466.  
  467. /**
  468.  * drm_gtf_mode - create the modeline based on GTF algorithm
  469.  *
  470.  * @dev         :drm device
  471.  * @hdisplay    :hdisplay size
  472.  * @vdisplay    :vdisplay size
  473.  * @vrefresh    :vrefresh rate.
  474.  * @interlaced  :whether the interlace is supported
  475.  * @margins     :whether the margin is supported
  476.  *
  477.  * LOCKING.
  478.  * none.
  479.  *
  480.  * return the modeline based on GTF algorithm
  481.  *
  482.  * This function is to create the modeline based on the GTF algorithm.
  483.  * Generalized Timing Formula is derived from:
  484.  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  485.  *      available at http://www.vesa.org
  486.  *
  487.  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
  488.  * What I have done is to translate it by using integer calculation.
  489.  * I also refer to the function of fb_get_mode in the file of
  490.  * drivers/video/fbmon.c
  491.  *
  492.  * Standard GTF parameters:
  493.  * M = 600
  494.  * C = 40
  495.  * K = 128
  496.  * J = 20
  497.  */
  498. struct drm_display_mode *
  499. drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
  500.              bool lace, int margins)
  501. {
  502.         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, lace,
  503.                                     margins, 600, 40 * 2, 128, 20 * 2);
  504. }
  505. EXPORT_SYMBOL(drm_gtf_mode);
  506.  
  507. #ifdef CONFIG_VIDEOMODE_HELPERS
  508. int drm_display_mode_from_videomode(const struct videomode *vm,
  509.                                     struct drm_display_mode *dmode)
  510. {
  511.         dmode->hdisplay = vm->hactive;
  512.         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
  513.         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
  514.         dmode->htotal = dmode->hsync_end + vm->hback_porch;
  515.  
  516.         dmode->vdisplay = vm->vactive;
  517.         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
  518.         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
  519.         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
  520.  
  521.         dmode->clock = vm->pixelclock / 1000;
  522.  
  523.         dmode->flags = 0;
  524.         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
  525.                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
  526.         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
  527.                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
  528.         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
  529.                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
  530.         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
  531.                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
  532.         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
  533.                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
  534.         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
  535.                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
  536.         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
  537.                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
  538.         drm_mode_set_name(dmode);
  539.  
  540.         return 0;
  541. }
  542. EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
  543.  
  544. #ifdef CONFIG_OF
  545. /**
  546.  * of_get_drm_display_mode - get a drm_display_mode from devicetree
  547.  * @np: device_node with the timing specification
  548.  * @dmode: will be set to the return value
  549.  * @index: index into the list of display timings in devicetree
  550.  *
  551.  * This function is expensive and should only be used, if only one mode is to be
  552.  * read from DT. To get multiple modes start with of_get_display_timings and
  553.  * work with that instead.
  554.  */
  555. int of_get_drm_display_mode(struct device_node *np,
  556.                             struct drm_display_mode *dmode, int index)
  557. {
  558.         struct videomode vm;
  559.         int ret;
  560.  
  561.         ret = of_get_videomode(np, &vm, index);
  562.         if (ret)
  563.                 return ret;
  564.  
  565.         drm_display_mode_from_videomode(&vm, dmode);
  566.  
  567.         pr_debug("%s: got %dx%d display mode from %s\n",
  568.                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
  569.         drm_mode_debug_printmodeline(dmode);
  570.  
  571.         return 0;
  572. }
  573. EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
  574. #endif /* CONFIG_OF */
  575. #endif /* CONFIG_VIDEOMODE_HELPERS */
  576.  
  577. /**
  578.  * drm_mode_set_name - set the name on a mode
  579.  * @mode: name will be set in this mode
  580.  *
  581.  * LOCKING:
  582.  * None.
  583.  *
  584.  * Set the name of @mode to a standard format.
  585.  */
  586. void drm_mode_set_name(struct drm_display_mode *mode)
  587. {
  588.         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  589.  
  590.         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
  591.                  mode->hdisplay, mode->vdisplay,
  592.                  interlaced ? "i" : "");
  593. }
  594. EXPORT_SYMBOL(drm_mode_set_name);
  595.  
  596. /**
  597.  * drm_mode_width - get the width of a mode
  598.  * @mode: mode
  599.  *
  600.  * LOCKING:
  601.  * None.
  602.  *
  603.  * Return @mode's width (hdisplay) value.
  604.  *
  605.  * FIXME: is this needed?
  606.  *
  607.  * RETURNS:
  608.  * @mode->hdisplay
  609.  */
  610. int drm_mode_width(const struct drm_display_mode *mode)
  611. {
  612.         return mode->hdisplay;
  613.  
  614. }
  615. EXPORT_SYMBOL(drm_mode_width);
  616.  
  617. /**
  618.  * drm_mode_height - get the height of a mode
  619.  * @mode: mode
  620.  *
  621.  * LOCKING:
  622.  * None.
  623.  *
  624.  * Return @mode's height (vdisplay) value.
  625.  *
  626.  * FIXME: is this needed?
  627.  *
  628.  * RETURNS:
  629.  * @mode->vdisplay
  630.  */
  631. int drm_mode_height(const struct drm_display_mode *mode)
  632. {
  633.         return mode->vdisplay;
  634. }
  635. EXPORT_SYMBOL(drm_mode_height);
  636.  
  637. /** drm_mode_hsync - get the hsync of a mode
  638.  * @mode: mode
  639.  *
  640.  * LOCKING:
  641.  * None.
  642.  *
  643.  * Return @modes's hsync rate in kHz, rounded to the nearest int.
  644.  */
  645. int drm_mode_hsync(const struct drm_display_mode *mode)
  646. {
  647.         unsigned int calc_val;
  648.  
  649.         if (mode->hsync)
  650.                 return mode->hsync;
  651.  
  652.         if (mode->htotal < 0)
  653.                 return 0;
  654.  
  655.         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
  656.         calc_val += 500;                                /* round to 1000Hz */
  657.         calc_val /= 1000;                               /* truncate to kHz */
  658.  
  659.         return calc_val;
  660. }
  661. EXPORT_SYMBOL(drm_mode_hsync);
  662.  
  663. /**
  664.  * drm_mode_vrefresh - get the vrefresh of a mode
  665.  * @mode: mode
  666.  *
  667.  * LOCKING:
  668.  * None.
  669.  *
  670.  * Return @mode's vrefresh rate in Hz or calculate it if necessary.
  671.  *
  672.  * FIXME: why is this needed?  shouldn't vrefresh be set already?
  673.  *
  674.  * RETURNS:
  675.  * Vertical refresh rate. It will be the result of actual value plus 0.5.
  676.  * If it is 70.288, it will return 70Hz.
  677.  * If it is 59.6, it will return 60Hz.
  678.  */
  679. int drm_mode_vrefresh(const struct drm_display_mode *mode)
  680. {
  681.         int refresh = 0;
  682.         unsigned int calc_val;
  683.  
  684.         if (mode->vrefresh > 0)
  685.                 refresh = mode->vrefresh;
  686.         else if (mode->htotal > 0 && mode->vtotal > 0) {
  687.                 int vtotal;
  688.                 vtotal = mode->vtotal;
  689.                 /* work out vrefresh the value will be x1000 */
  690.                 calc_val = (mode->clock * 1000);
  691.                 calc_val /= mode->htotal;
  692.                 refresh = (calc_val + vtotal / 2) / vtotal;
  693.  
  694.                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  695.                         refresh *= 2;
  696.                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  697.                         refresh /= 2;
  698.                 if (mode->vscan > 1)
  699.                         refresh /= mode->vscan;
  700.         }
  701.         return refresh;
  702. }
  703. EXPORT_SYMBOL(drm_mode_vrefresh);
  704.  
  705. /**
  706.  * drm_mode_set_crtcinfo - set CRTC modesetting parameters
  707.  * @p: mode
  708.  * @adjust_flags: a combination of adjustment flags
  709.  *
  710.  * LOCKING:
  711.  * None.
  712.  *
  713.  * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
  714.  *
  715.  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
  716.  *   interlaced modes.
  717.  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
  718.  *   buffers containing two eyes (only adjust the timings when needed, eg. for
  719.  *   "frame packing" or "side by side full").
  720.  */
  721. void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
  722. {
  723.         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
  724.                 return;
  725.  
  726.         p->crtc_clock = p->clock;
  727.         p->crtc_hdisplay = p->hdisplay;
  728.         p->crtc_hsync_start = p->hsync_start;
  729.         p->crtc_hsync_end = p->hsync_end;
  730.         p->crtc_htotal = p->htotal;
  731.         p->crtc_hskew = p->hskew;
  732.         p->crtc_vdisplay = p->vdisplay;
  733.         p->crtc_vsync_start = p->vsync_start;
  734.         p->crtc_vsync_end = p->vsync_end;
  735.         p->crtc_vtotal = p->vtotal;
  736.  
  737.         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
  738.                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
  739.                         p->crtc_vdisplay /= 2;
  740.                         p->crtc_vsync_start /= 2;
  741.                         p->crtc_vsync_end /= 2;
  742.                         p->crtc_vtotal /= 2;
  743.                 }
  744.         }
  745.  
  746.         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
  747.                 p->crtc_vdisplay *= 2;
  748.                 p->crtc_vsync_start *= 2;
  749.                 p->crtc_vsync_end *= 2;
  750.                 p->crtc_vtotal *= 2;
  751.         }
  752.  
  753.         if (p->vscan > 1) {
  754.                 p->crtc_vdisplay *= p->vscan;
  755.                 p->crtc_vsync_start *= p->vscan;
  756.                 p->crtc_vsync_end *= p->vscan;
  757.                 p->crtc_vtotal *= p->vscan;
  758.         }
  759.  
  760.         if (adjust_flags & CRTC_STEREO_DOUBLE) {
  761.                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
  762.  
  763.                 switch (layout) {
  764.                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
  765.                         p->crtc_clock *= 2;
  766.                         p->crtc_vdisplay += p->crtc_vtotal;
  767.                         p->crtc_vsync_start += p->crtc_vtotal;
  768.                         p->crtc_vsync_end += p->crtc_vtotal;
  769.                         p->crtc_vtotal += p->crtc_vtotal;
  770.                         break;
  771.                 }
  772.         }
  773.  
  774.         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
  775.         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
  776.         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
  777.         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
  778. }
  779. EXPORT_SYMBOL(drm_mode_set_crtcinfo);
  780.  
  781.  
  782. /**
  783.  * drm_mode_copy - copy the mode
  784.  * @dst: mode to overwrite
  785.  * @src: mode to copy
  786.  *
  787.  * LOCKING:
  788.  * None.
  789.  *
  790.  * Copy an existing mode into another mode, preserving the object id and
  791.  * list head of the destination mode.
  792.  */
  793. void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
  794. {
  795.         int id = dst->base.id;
  796.         struct list_head head = dst->head;
  797.  
  798.         *dst = *src;
  799.         dst->base.id = id;
  800.         dst->head = head;
  801. }
  802. EXPORT_SYMBOL(drm_mode_copy);
  803.  
  804. /**
  805.  * drm_mode_duplicate - allocate and duplicate an existing mode
  806.  * @m: mode to duplicate
  807.  *
  808.  * LOCKING:
  809.  * None.
  810.  *
  811.  * Just allocate a new mode, copy the existing mode into it, and return
  812.  * a pointer to it.  Used to create new instances of established modes.
  813.  */
  814. struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
  815.                                             const struct drm_display_mode *mode)
  816. {
  817.         struct drm_display_mode *nmode;
  818.  
  819.         nmode = drm_mode_create(dev);
  820.         if (!nmode)
  821.                 return NULL;
  822.  
  823.         drm_mode_copy(nmode, mode);
  824.  
  825.         return nmode;
  826. }
  827. EXPORT_SYMBOL(drm_mode_duplicate);
  828.  
  829. /**
  830.  * drm_mode_equal - test modes for equality
  831.  * @mode1: first mode
  832.  * @mode2: second mode
  833.  *
  834.  * LOCKING:
  835.  * None.
  836.  *
  837.  * Check to see if @mode1 and @mode2 are equivalent.
  838.  *
  839.  * RETURNS:
  840.  * True if the modes are equal, false otherwise.
  841.  */
  842. bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
  843. {
  844.         /* do clock check convert to PICOS so fb modes get matched
  845.          * the same */
  846.         if (mode1->clock && mode2->clock) {
  847.                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
  848.                         return false;
  849.         } else if (mode1->clock != mode2->clock)
  850.                 return false;
  851.  
  852.         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
  853.             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
  854.                 return false;
  855.  
  856.         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
  857. }
  858. EXPORT_SYMBOL(drm_mode_equal);
  859.  
  860. /**
  861.  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
  862.  * @mode1: first mode
  863.  * @mode2: second mode
  864.  *
  865.  * LOCKING:
  866.  * None.
  867.  *
  868.  * Check to see if @mode1 and @mode2 are equivalent, but
  869.  * don't check the pixel clocks nor the stereo layout.
  870.  *
  871.  * RETURNS:
  872.  * True if the modes are equal, false otherwise.
  873.  */
  874. bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
  875.                                         const struct drm_display_mode *mode2)
  876. {
  877.         if (mode1->hdisplay == mode2->hdisplay &&
  878.             mode1->hsync_start == mode2->hsync_start &&
  879.             mode1->hsync_end == mode2->hsync_end &&
  880.             mode1->htotal == mode2->htotal &&
  881.             mode1->hskew == mode2->hskew &&
  882.             mode1->vdisplay == mode2->vdisplay &&
  883.             mode1->vsync_start == mode2->vsync_start &&
  884.             mode1->vsync_end == mode2->vsync_end &&
  885.             mode1->vtotal == mode2->vtotal &&
  886.             mode1->vscan == mode2->vscan &&
  887.             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
  888.              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
  889.                 return true;
  890.  
  891.         return false;
  892. }
  893. EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
  894.  
  895. /**
  896.  * drm_mode_validate_size - make sure modes adhere to size constraints
  897.  * @dev: DRM device
  898.  * @mode_list: list of modes to check
  899.  * @maxX: maximum width
  900.  * @maxY: maximum height
  901.  * @maxPitch: max pitch
  902.  *
  903.  * LOCKING:
  904.  * Caller must hold a lock protecting @mode_list.
  905.  *
  906.  * The DRM device (@dev) has size and pitch limits.  Here we validate the
  907.  * modes we probed for @dev against those limits and set their status as
  908.  * necessary.
  909.  */
  910. void drm_mode_validate_size(struct drm_device *dev,
  911.                             struct list_head *mode_list,
  912.                             int maxX, int maxY, int maxPitch)
  913. {
  914.         struct drm_display_mode *mode;
  915.  
  916.         list_for_each_entry(mode, mode_list, head) {
  917.                 if (maxPitch > 0 && mode->hdisplay > maxPitch)
  918.                         mode->status = MODE_BAD_WIDTH;
  919.  
  920.                 if (maxX > 0 && mode->hdisplay > maxX)
  921.                         mode->status = MODE_VIRTUAL_X;
  922.  
  923.                 if (maxY > 0 && mode->vdisplay > maxY)
  924.                         mode->status = MODE_VIRTUAL_Y;
  925.         }
  926. }
  927. EXPORT_SYMBOL(drm_mode_validate_size);
  928.  
  929. /**
  930.  * drm_mode_prune_invalid - remove invalid modes from mode list
  931.  * @dev: DRM device
  932.  * @mode_list: list of modes to check
  933.  * @verbose: be verbose about it
  934.  *
  935.  * LOCKING:
  936.  * Caller must hold a lock protecting @mode_list.
  937.  *
  938.  * Once mode list generation is complete, a caller can use this routine to
  939.  * remove invalid modes from a mode list.  If any of the modes have a
  940.  * status other than %MODE_OK, they are removed from @mode_list and freed.
  941.  */
  942. void drm_mode_prune_invalid(struct drm_device *dev,
  943.                             struct list_head *mode_list, bool verbose)
  944. {
  945.         struct drm_display_mode *mode, *t;
  946.  
  947.         list_for_each_entry_safe(mode, t, mode_list, head) {
  948.                 if (mode->status != MODE_OK) {
  949.                         list_del(&mode->head);
  950.                         if (verbose) {
  951.                                 drm_mode_debug_printmodeline(mode);
  952.                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
  953.                                         mode->name, mode->status);
  954.                         }
  955.                         drm_mode_destroy(dev, mode);
  956.                 }
  957.         }
  958. }
  959. EXPORT_SYMBOL(drm_mode_prune_invalid);
  960.  
  961. /**
  962.  * drm_mode_compare - compare modes for favorability
  963.  * @priv: unused
  964.  * @lh_a: list_head for first mode
  965.  * @lh_b: list_head for second mode
  966.  *
  967.  * LOCKING:
  968.  * None.
  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 to sort
  1002.  *
  1003.  * LOCKING:
  1004.  * Caller must hold a lock protecting @mode_list.
  1005.  *
  1006.  * Sort @mode_list by favorability, putting good modes first.
  1007.  */
  1008. void drm_mode_sort(struct list_head *mode_list)
  1009. {
  1010.         list_sort(NULL, mode_list, drm_mode_compare);
  1011. }
  1012. EXPORT_SYMBOL(drm_mode_sort);
  1013.  
  1014. /**
  1015.  * drm_mode_connector_list_update - update the mode list for the connector
  1016.  * @connector: the connector to update
  1017.  *
  1018.  * LOCKING:
  1019.  * Caller must hold a lock protecting @mode_list.
  1020.  *
  1021.  * This moves the modes from the @connector probed_modes list
  1022.  * to the actual mode list. It compares the probed mode against the current
  1023.  * list and only adds different modes. All modes unverified after this point
  1024.  * will be removed by the prune invalid modes.
  1025.  */
  1026. void drm_mode_connector_list_update(struct drm_connector *connector)
  1027. {
  1028.         struct drm_display_mode *mode;
  1029.         struct drm_display_mode *pmode, *pt;
  1030.         int found_it;
  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.                                 mode->type |= pmode->type;
  1043.                                 list_del(&pmode->head);
  1044.                                 drm_mode_destroy(connector->dev, pmode);
  1045.                                 break;
  1046.                         }
  1047.                 }
  1048.  
  1049.                 if (!found_it) {
  1050.                         list_move_tail(&pmode->head, &connector->modes);
  1051.                 }
  1052.         }
  1053. }
  1054. EXPORT_SYMBOL(drm_mode_connector_list_update);
  1055.