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  1. /*
  2.  * The list_sort function is (presumably) licensed under the GPL (see the
  3.  * top level "COPYING" file for details).
  4.  *
  5.  * The remainder of this file is:
  6.  *
  7.  * Copyright © 1997-2003 by The XFree86 Project, Inc.
  8.  * Copyright © 2007 Dave Airlie
  9.  * Copyright © 2007-2008 Intel Corporation
  10.  *   Jesse Barnes <jesse.barnes@intel.com>
  11.  * Copyright 2005-2006 Luc Verhaegen
  12.  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
  13.  *
  14.  * Permission is hereby granted, free of charge, to any person obtaining a
  15.  * copy of this software and associated documentation files (the "Software"),
  16.  * to deal in the Software without restriction, including without limitation
  17.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18.  * and/or sell copies of the Software, and to permit persons to whom the
  19.  * Software is furnished to do so, subject to the following conditions:
  20.  *
  21.  * The above copyright notice and this permission notice shall be included in
  22.  * all copies or substantial portions of the Software.
  23.  *
  24.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  27.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  28.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  29.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  30.  * OTHER DEALINGS IN THE SOFTWARE.
  31.  *
  32.  * Except as contained in this notice, the name of the copyright holder(s)
  33.  * and author(s) shall not be used in advertising or otherwise to promote
  34.  * the sale, use or other dealings in this Software without prior written
  35.  * authorization from the copyright holder(s) and author(s).
  36.  */
  37.  
  38. #include <linux/list.h>
  39. #include "drmP.h"
  40. #include "drm.h"
  41. #include "drm_crtc.h"
  42.  
  43. /**
  44.  * drm_mode_debug_printmodeline - debug print a mode
  45.  * @dev: DRM device
  46.  * @mode: mode to print
  47.  *
  48.  * LOCKING:
  49.  * None.
  50.  *
  51.  * Describe @mode using DRM_DEBUG.
  52.  */
  53. void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
  54. {
  55.         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  56.                         "0x%x 0x%x\n",
  57.                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  58.                 mode->hdisplay, mode->hsync_start,
  59.                 mode->hsync_end, mode->htotal,
  60.                 mode->vdisplay, mode->vsync_start,
  61.                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  62. }
  63. EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  64.  
  65. /**
  66.  * drm_cvt_mode -create a modeline based on CVT algorithm
  67.  * @dev: DRM device
  68.  * @hdisplay: hdisplay size
  69.  * @vdisplay: vdisplay size
  70.  * @vrefresh  : vrefresh rate
  71.  * @reduced : Whether the GTF calculation is simplified
  72.  * @interlaced:Whether the interlace is supported
  73.  *
  74.  * LOCKING:
  75.  * none.
  76.  *
  77.  * return the modeline based on CVT algorithm
  78.  *
  79.  * This function is called to generate the modeline based on CVT algorithm
  80.  * according to the hdisplay, vdisplay, vrefresh.
  81.  * It is based from the VESA(TM) Coordinated Video Timing Generator by
  82.  * Graham Loveridge April 9, 2003 available at
  83.  * http://www.vesa.org/public/CVT/CVTd6r1.xls
  84.  *
  85.  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
  86.  * What I have done is to translate it by using integer calculation.
  87.  */
  88. #define HV_FACTOR                       1000
  89. struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
  90.                                       int vdisplay, int vrefresh,
  91.                                       bool reduced, bool interlaced, bool margins)
  92. {
  93.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  94. #define CVT_MARGIN_PERCENTAGE           18
  95.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  96. #define CVT_H_GRANULARITY               8
  97.         /* 3) Minimum vertical porch (lines) - default 3 */
  98. #define CVT_MIN_V_PORCH                 3
  99.         /* 4) Minimum number of vertical back porch lines - default 6 */
  100. #define CVT_MIN_V_BPORCH                6
  101.         /* Pixel Clock step (kHz) */
  102. #define CVT_CLOCK_STEP                  250
  103.         struct drm_display_mode *drm_mode;
  104.         unsigned int vfieldrate, hperiod;
  105.         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
  106.         int interlace;
  107.  
  108.         /* allocate the drm_display_mode structure. If failure, we will
  109.          * return directly
  110.          */
  111.         drm_mode = drm_mode_create(dev);
  112.         if (!drm_mode)
  113.                 return NULL;
  114.  
  115.         /* the CVT default refresh rate is 60Hz */
  116.         if (!vrefresh)
  117.                 vrefresh = 60;
  118.  
  119.         /* the required field fresh rate */
  120.         if (interlaced)
  121.                 vfieldrate = vrefresh * 2;
  122.         else
  123.                 vfieldrate = vrefresh;
  124.  
  125.         /* horizontal pixels */
  126.         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
  127.  
  128.         /* determine the left&right borders */
  129.         hmargin = 0;
  130.         if (margins) {
  131.                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  132.                 hmargin -= hmargin % CVT_H_GRANULARITY;
  133.         }
  134.         /* find the total active pixels */
  135.         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
  136.  
  137.         /* find the number of lines per field */
  138.         if (interlaced)
  139.                 vdisplay_rnd = vdisplay / 2;
  140.         else
  141.                 vdisplay_rnd = vdisplay;
  142.  
  143.         /* find the top & bottom borders */
  144.         vmargin = 0;
  145.         if (margins)
  146.                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  147.  
  148.         drm_mode->vdisplay = vdisplay + 2 * vmargin;
  149.  
  150.         /* Interlaced */
  151.         if (interlaced)
  152.                 interlace = 1;
  153.         else
  154.                 interlace = 0;
  155.  
  156.         /* Determine VSync Width from aspect ratio */
  157.         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
  158.                 vsync = 4;
  159.         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
  160.                 vsync = 5;
  161.         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
  162.                 vsync = 6;
  163.         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
  164.                 vsync = 7;
  165.         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
  166.                 vsync = 7;
  167.         else /* custom */
  168.                 vsync = 10;
  169.  
  170.         if (!reduced) {
  171.                 /* simplify the GTF calculation */
  172.                 /* 4) Minimum time of vertical sync + back porch interval (µs)
  173.                  * default 550.0
  174.                  */
  175.                 int tmp1, tmp2;
  176. #define CVT_MIN_VSYNC_BP        550
  177.                 /* 3) Nominal HSync width (% of line period) - default 8 */
  178. #define CVT_HSYNC_PERCENTAGE    8
  179.                 unsigned int hblank_percentage;
  180.                 int vsyncandback_porch, vback_porch, hblank;
  181.  
  182.                 /* estimated the horizontal period */
  183.                 tmp1 = HV_FACTOR * 1000000  -
  184.                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
  185.                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
  186.                                 interlace;
  187.                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
  188.  
  189.                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
  190.                 /* 9. Find number of lines in sync + backporch */
  191.                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
  192.                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
  193.                 else
  194.                         vsyncandback_porch = tmp1;
  195.                 /* 10. Find number of lines in back porch */
  196.                 vback_porch = vsyncandback_porch - vsync;
  197.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
  198.                                 vsyncandback_porch + CVT_MIN_V_PORCH;
  199.                 /* 5) Definition of Horizontal blanking time limitation */
  200.                 /* Gradient (%/kHz) - default 600 */
  201. #define CVT_M_FACTOR    600
  202.                 /* Offset (%) - default 40 */
  203. #define CVT_C_FACTOR    40
  204.                 /* Blanking time scaling factor - default 128 */
  205. #define CVT_K_FACTOR    128
  206.                 /* Scaling factor weighting - default 20 */
  207. #define CVT_J_FACTOR    20
  208. #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
  209. #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
  210.                          CVT_J_FACTOR)
  211.                 /* 12. Find ideal blanking duty cycle from formula */
  212.                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
  213.                                         hperiod / 1000;
  214.                 /* 13. Blanking time */
  215.                 if (hblank_percentage < 20 * HV_FACTOR)
  216.                         hblank_percentage = 20 * HV_FACTOR;
  217.                 hblank = drm_mode->hdisplay * hblank_percentage /
  218.                          (100 * HV_FACTOR - hblank_percentage);
  219.                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
  220.                 /* 14. find the total pixes per line */
  221.                 drm_mode->htotal = drm_mode->hdisplay + hblank;
  222.                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
  223.                 drm_mode->hsync_start = drm_mode->hsync_end -
  224.                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
  225.                 drm_mode->hsync_start += CVT_H_GRANULARITY -
  226.                         drm_mode->hsync_start % CVT_H_GRANULARITY;
  227.                 /* fill the Vsync values */
  228.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
  229.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  230.         } else {
  231.                 /* Reduced blanking */
  232.                 /* Minimum vertical blanking interval time (µs)- default 460 */
  233. #define CVT_RB_MIN_VBLANK       460
  234.                 /* Fixed number of clocks for horizontal sync */
  235. #define CVT_RB_H_SYNC           32
  236.                 /* Fixed number of clocks for horizontal blanking */
  237. #define CVT_RB_H_BLANK          160
  238.                 /* Fixed number of lines for vertical front porch - default 3*/
  239. #define CVT_RB_VFPORCH          3
  240.                 int vbilines;
  241.                 int tmp1, tmp2;
  242.                 /* 8. Estimate Horizontal period. */
  243.                 tmp1 = HV_FACTOR * 1000000 -
  244.                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
  245.                 tmp2 = vdisplay_rnd + 2 * vmargin;
  246.                 hperiod = tmp1 / (tmp2 * vfieldrate);
  247.                 /* 9. Find number of lines in vertical blanking */
  248.                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
  249.                 /* 10. Check if vertical blanking is sufficient */
  250.                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
  251.                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
  252.                 /* 11. Find total number of lines in vertical field */
  253.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
  254.                 /* 12. Find total number of pixels in a line */
  255.                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
  256.                 /* Fill in HSync values */
  257.                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
  258.                 drm_mode->hsync_start = drm_mode->hsync_end = CVT_RB_H_SYNC;
  259.         }
  260.         /* 15/13. Find pixel clock frequency (kHz for xf86) */
  261.         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
  262.         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
  263.         /* 18/16. Find actual vertical frame frequency */
  264.         /* ignore - just set the mode flag for interlaced */
  265.         if (interlaced)
  266.                 drm_mode->vtotal *= 2;
  267.         /* Fill the mode line name */
  268.         drm_mode_set_name(drm_mode);
  269.         if (reduced)
  270.                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
  271.                                         DRM_MODE_FLAG_NVSYNC);
  272.         else
  273.                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
  274.                                         DRM_MODE_FLAG_NHSYNC);
  275.         if (interlaced)
  276.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  277.  
  278.     return drm_mode;
  279. }
  280. EXPORT_SYMBOL(drm_cvt_mode);
  281.  
  282. /**
  283.  * drm_gtf_mode - create the modeline based on GTF algorithm
  284.  *
  285.  * @dev         :drm device
  286.  * @hdisplay    :hdisplay size
  287.  * @vdisplay    :vdisplay size
  288.  * @vrefresh    :vrefresh rate.
  289.  * @interlaced  :whether the interlace is supported
  290.  * @margins     :whether the margin is supported
  291.  *
  292.  * LOCKING.
  293.  * none.
  294.  *
  295.  * return the modeline based on GTF algorithm
  296.  *
  297.  * This function is to create the modeline based on the GTF algorithm.
  298.  * Generalized Timing Formula is derived from:
  299.  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  300.  *      available at http://www.vesa.org
  301.  *
  302.  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
  303.  * What I have done is to translate it by using integer calculation.
  304.  * I also refer to the function of fb_get_mode in the file of
  305.  * drivers/video/fbmon.c
  306.  */
  307. struct drm_display_mode *drm_gtf_mode(struct drm_device *dev, int hdisplay,
  308.                                       int vdisplay, int vrefresh,
  309.                                       bool interlaced, int margins)
  310. {
  311.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  312. #define GTF_MARGIN_PERCENTAGE           18
  313.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  314. #define GTF_CELL_GRAN                   8
  315.         /* 3) Minimum vertical porch (lines) - default 3 */
  316. #define GTF_MIN_V_PORCH                 1
  317.         /* width of vsync in lines */
  318. #define V_SYNC_RQD                      3
  319.         /* width of hsync as % of total line */
  320. #define H_SYNC_PERCENT                  8
  321.         /* min time of vsync + back porch (microsec) */
  322. #define MIN_VSYNC_PLUS_BP               550
  323.         /* blanking formula gradient */
  324. #define GTF_M                           600
  325.         /* blanking formula offset */
  326. #define GTF_C                           40
  327.         /* blanking formula scaling factor */
  328. #define GTF_K                           128
  329.         /* blanking formula scaling factor */
  330. #define GTF_J                           20
  331.         /* C' and M' are part of the Blanking Duty Cycle computation */
  332. #define GTF_C_PRIME             (((GTF_C - GTF_J) * GTF_K / 256) + GTF_J)
  333. #define GTF_M_PRIME             (GTF_K * GTF_M / 256)
  334.         struct drm_display_mode *drm_mode;
  335.         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
  336.         int top_margin, bottom_margin;
  337.         int interlace;
  338.         unsigned int hfreq_est;
  339.         int vsync_plus_bp, vback_porch;
  340.         unsigned int vtotal_lines, vfieldrate_est, hperiod;
  341.         unsigned int vfield_rate, vframe_rate;
  342.         int left_margin, right_margin;
  343.         unsigned int total_active_pixels, ideal_duty_cycle;
  344.         unsigned int hblank, total_pixels, pixel_freq;
  345.         int hsync, hfront_porch, vodd_front_porch_lines;
  346.         unsigned int tmp1, tmp2;
  347.  
  348.         drm_mode = drm_mode_create(dev);
  349.         if (!drm_mode)
  350.                 return NULL;
  351.  
  352.         /* 1. In order to give correct results, the number of horizontal
  353.          * pixels requested is first processed to ensure that it is divisible
  354.          * by the character size, by rounding it to the nearest character
  355.          * cell boundary:
  356.          */
  357.         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  358.         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
  359.  
  360.         /* 2. If interlace is requested, the number of vertical lines assumed
  361.          * by the calculation must be halved, as the computation calculates
  362.          * the number of vertical lines per field.
  363.          */
  364.         if (interlaced)
  365.                 vdisplay_rnd = vdisplay / 2;
  366.         else
  367.                 vdisplay_rnd = vdisplay;
  368.  
  369.         /* 3. Find the frame rate required: */
  370.         if (interlaced)
  371.                 vfieldrate_rqd = vrefresh * 2;
  372.         else
  373.                 vfieldrate_rqd = vrefresh;
  374.  
  375.         /* 4. Find number of lines in Top margin: */
  376.         top_margin = 0;
  377.         if (margins)
  378.                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  379.                                 1000;
  380.         /* 5. Find number of lines in bottom margin: */
  381.         bottom_margin = top_margin;
  382.  
  383.         /* 6. If interlace is required, then set variable interlace: */
  384.         if (interlaced)
  385.                 interlace = 1;
  386.         else
  387.                 interlace = 0;
  388.  
  389.         /* 7. Estimate the Horizontal frequency */
  390.         {
  391.                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
  392.                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
  393.                                 2 + interlace;
  394.                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
  395.         }
  396.  
  397.         /* 8. Find the number of lines in V sync + back porch */
  398.         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
  399.         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
  400.         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
  401.         /*  9. Find the number of lines in V back porch alone: */
  402.         vback_porch = vsync_plus_bp - V_SYNC_RQD;
  403.         /*  10. Find the total number of lines in Vertical field period: */
  404.         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
  405.                         vsync_plus_bp + GTF_MIN_V_PORCH;
  406.         /*  11. Estimate the Vertical field frequency: */
  407.         vfieldrate_est = hfreq_est / vtotal_lines;
  408.         /*  12. Find the actual horizontal period: */
  409.         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
  410.  
  411.         /*  13. Find the actual Vertical field frequency: */
  412.         vfield_rate = hfreq_est / vtotal_lines;
  413.         /*  14. Find the Vertical frame frequency: */
  414.         if (interlaced)
  415.                 vframe_rate = vfield_rate / 2;
  416.         else
  417.                 vframe_rate = vfield_rate;
  418.         /*  15. Find number of pixels in left margin: */
  419.         if (margins)
  420.                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  421.                                 1000;
  422.         else
  423.                 left_margin = 0;
  424.  
  425.         /* 16.Find number of pixels in right margin: */
  426.         right_margin = left_margin;
  427.         /* 17.Find total number of active pixels in image and left and right */
  428.         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
  429.         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
  430.         ideal_duty_cycle = GTF_C_PRIME * 1000 -
  431.                                 (GTF_M_PRIME * 1000000 / hfreq_est);
  432.         /* 19.Find the number of pixels in the blanking time to the nearest
  433.          * double character cell: */
  434.         hblank = total_active_pixels * ideal_duty_cycle /
  435.                         (100000 - ideal_duty_cycle);
  436.         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
  437.         hblank = hblank * 2 * GTF_CELL_GRAN;
  438.         /* 20.Find total number of pixels: */
  439.         total_pixels = total_active_pixels + hblank;
  440.         /* 21.Find pixel clock frequency: */
  441.         pixel_freq = total_pixels * hfreq_est / 1000;
  442.         /* Stage 1 computations are now complete; I should really pass
  443.          * the results to another function and do the Stage 2 computations,
  444.          * but I only need a few more values so I'll just append the
  445.          * computations here for now */
  446.         /* 17. Find the number of pixels in the horizontal sync period: */
  447.         hsync = H_SYNC_PERCENT * total_pixels / 100;
  448.         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  449.         hsync = hsync * GTF_CELL_GRAN;
  450.         /* 18. Find the number of pixels in horizontal front porch period */
  451.         hfront_porch = hblank / 2 - hsync;
  452.         /*  36. Find the number of lines in the odd front porch period: */
  453.         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
  454.  
  455.         /* finally, pack the results in the mode struct */
  456.         drm_mode->hdisplay = hdisplay_rnd;
  457.         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
  458.         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
  459.         drm_mode->htotal = total_pixels;
  460.         drm_mode->vdisplay = vdisplay_rnd;
  461.         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
  462.         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
  463.         drm_mode->vtotal = vtotal_lines;
  464.  
  465.         drm_mode->clock = pixel_freq;
  466.  
  467.         drm_mode_set_name(drm_mode);
  468.         drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
  469.  
  470.         if (interlaced) {
  471.                 drm_mode->vtotal *= 2;
  472.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  473.         }
  474.  
  475.         return drm_mode;
  476. }
  477. EXPORT_SYMBOL(drm_gtf_mode);
  478. /**
  479.  * drm_mode_set_name - set the name on a mode
  480.  * @mode: name will be set in this mode
  481.  *
  482.  * LOCKING:
  483.  * None.
  484.  *
  485.  * Set the name of @mode to a standard format.
  486.  */
  487. void drm_mode_set_name(struct drm_display_mode *mode)
  488. {
  489.         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d", mode->hdisplay,
  490.                  mode->vdisplay);
  491. }
  492. EXPORT_SYMBOL(drm_mode_set_name);
  493.  
  494. /**
  495.  * drm_mode_list_concat - move modes from one list to another
  496.  * @head: source list
  497.  * @new: dst list
  498.  *
  499.  * LOCKING:
  500.  * Caller must ensure both lists are locked.
  501.  *
  502.  * Move all the modes from @head to @new.
  503.  */
  504. void drm_mode_list_concat(struct list_head *head, struct list_head *new)
  505. {
  506.  
  507.         struct list_head *entry, *tmp;
  508.  
  509.         list_for_each_safe(entry, tmp, head) {
  510.                 list_move_tail(entry, new);
  511.         }
  512. }
  513. EXPORT_SYMBOL(drm_mode_list_concat);
  514.  
  515. /**
  516.  * drm_mode_width - get the width of a mode
  517.  * @mode: mode
  518.  *
  519.  * LOCKING:
  520.  * None.
  521.  *
  522.  * Return @mode's width (hdisplay) value.
  523.  *
  524.  * FIXME: is this needed?
  525.  *
  526.  * RETURNS:
  527.  * @mode->hdisplay
  528.  */
  529. int drm_mode_width(struct drm_display_mode *mode)
  530. {
  531.         return mode->hdisplay;
  532.  
  533. }
  534. EXPORT_SYMBOL(drm_mode_width);
  535.  
  536. /**
  537.  * drm_mode_height - get the height of a mode
  538.  * @mode: mode
  539.  *
  540.  * LOCKING:
  541.  * None.
  542.  *
  543.  * Return @mode's height (vdisplay) value.
  544.  *
  545.  * FIXME: is this needed?
  546.  *
  547.  * RETURNS:
  548.  * @mode->vdisplay
  549.  */
  550. int drm_mode_height(struct drm_display_mode *mode)
  551. {
  552.         return mode->vdisplay;
  553. }
  554. EXPORT_SYMBOL(drm_mode_height);
  555.  
  556. /**
  557.  * drm_mode_vrefresh - get the vrefresh of a mode
  558.  * @mode: mode
  559.  *
  560.  * LOCKING:
  561.  * None.
  562.  *
  563.  * Return @mode's vrefresh rate or calculate it if necessary.
  564.  *
  565.  * FIXME: why is this needed?  shouldn't vrefresh be set already?
  566.  *
  567.  * RETURNS:
  568.  * Vertical refresh rate. It will be the result of actual value plus 0.5.
  569.  * If it is 70.288, it will return 70Hz.
  570.  * If it is 59.6, it will return 60Hz.
  571.  */
  572. int drm_mode_vrefresh(struct drm_display_mode *mode)
  573. {
  574.         int refresh = 0;
  575.         unsigned int calc_val;
  576.  
  577.         if (mode->vrefresh > 0)
  578.                 refresh = mode->vrefresh;
  579.         else if (mode->htotal > 0 && mode->vtotal > 0) {
  580.                 int vtotal;
  581.                 vtotal = mode->vtotal;
  582.                 /* work out vrefresh the value will be x1000 */
  583.                 calc_val = (mode->clock * 1000);
  584.                 calc_val /= mode->htotal;
  585.                 refresh = (calc_val + vtotal / 2) / vtotal;
  586.  
  587.                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  588.                         refresh *= 2;
  589.                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  590.                         refresh /= 2;
  591.                 if (mode->vscan > 1)
  592.                         refresh /= mode->vscan;
  593.         }
  594.         return refresh;
  595. }
  596. EXPORT_SYMBOL(drm_mode_vrefresh);
  597.  
  598. /**
  599.  * drm_mode_set_crtcinfo - set CRTC modesetting parameters
  600.  * @p: mode
  601.  * @adjust_flags: unused? (FIXME)
  602.  *
  603.  * LOCKING:
  604.  * None.
  605.  *
  606.  * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
  607.  */
  608. void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
  609. {
  610.         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
  611.                 return;
  612.  
  613.         p->crtc_hdisplay = p->hdisplay;
  614.         p->crtc_hsync_start = p->hsync_start;
  615.         p->crtc_hsync_end = p->hsync_end;
  616.         p->crtc_htotal = p->htotal;
  617.         p->crtc_hskew = p->hskew;
  618.         p->crtc_vdisplay = p->vdisplay;
  619.         p->crtc_vsync_start = p->vsync_start;
  620.         p->crtc_vsync_end = p->vsync_end;
  621.         p->crtc_vtotal = p->vtotal;
  622.  
  623.         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
  624.                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
  625.                         p->crtc_vdisplay /= 2;
  626.                         p->crtc_vsync_start /= 2;
  627.                         p->crtc_vsync_end /= 2;
  628.                         p->crtc_vtotal /= 2;
  629.                 }
  630.  
  631.                 p->crtc_vtotal |= 1;
  632.         }
  633.  
  634.         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
  635.                 p->crtc_vdisplay *= 2;
  636.                 p->crtc_vsync_start *= 2;
  637.                 p->crtc_vsync_end *= 2;
  638.                 p->crtc_vtotal *= 2;
  639.         }
  640.  
  641.         if (p->vscan > 1) {
  642.                 p->crtc_vdisplay *= p->vscan;
  643.                 p->crtc_vsync_start *= p->vscan;
  644.                 p->crtc_vsync_end *= p->vscan;
  645.                 p->crtc_vtotal *= p->vscan;
  646.         }
  647.  
  648.         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
  649.         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
  650.         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
  651.         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
  652.  
  653.         p->crtc_hadjusted = false;
  654.         p->crtc_vadjusted = false;
  655. }
  656. EXPORT_SYMBOL(drm_mode_set_crtcinfo);
  657.  
  658.  
  659. /**
  660.  * drm_mode_duplicate - allocate and duplicate an existing mode
  661.  * @m: mode to duplicate
  662.  *
  663.  * LOCKING:
  664.  * None.
  665.  *
  666.  * Just allocate a new mode, copy the existing mode into it, and return
  667.  * a pointer to it.  Used to create new instances of established modes.
  668.  */
  669. struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
  670.                                             struct drm_display_mode *mode)
  671. {
  672.         struct drm_display_mode *nmode;
  673.         int new_id;
  674.  
  675.         nmode = drm_mode_create(dev);
  676.         if (!nmode)
  677.                 return NULL;
  678.  
  679.         new_id = nmode->base.id;
  680.         *nmode = *mode;
  681.         nmode->base.id = new_id;
  682.         INIT_LIST_HEAD(&nmode->head);
  683.         return nmode;
  684. }
  685. EXPORT_SYMBOL(drm_mode_duplicate);
  686.  
  687. /**
  688.  * drm_mode_equal - test modes for equality
  689.  * @mode1: first mode
  690.  * @mode2: second mode
  691.  *
  692.  * LOCKING:
  693.  * None.
  694.  *
  695.  * Check to see if @mode1 and @mode2 are equivalent.
  696.  *
  697.  * RETURNS:
  698.  * True if the modes are equal, false otherwise.
  699.  */
  700. bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
  701. {
  702.         /* do clock check convert to PICOS so fb modes get matched
  703.          * the same */
  704.         if (mode1->clock && mode2->clock) {
  705.                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
  706.                         return false;
  707.         } else if (mode1->clock != mode2->clock)
  708.                 return false;
  709.  
  710.         if (mode1->hdisplay == mode2->hdisplay &&
  711.             mode1->hsync_start == mode2->hsync_start &&
  712.             mode1->hsync_end == mode2->hsync_end &&
  713.             mode1->htotal == mode2->htotal &&
  714.             mode1->hskew == mode2->hskew &&
  715.             mode1->vdisplay == mode2->vdisplay &&
  716.             mode1->vsync_start == mode2->vsync_start &&
  717.             mode1->vsync_end == mode2->vsync_end &&
  718.             mode1->vtotal == mode2->vtotal &&
  719.             mode1->vscan == mode2->vscan &&
  720.             mode1->flags == mode2->flags)
  721.                 return true;
  722.  
  723.         return false;
  724. }
  725. EXPORT_SYMBOL(drm_mode_equal);
  726.  
  727. /**
  728.  * drm_mode_validate_size - make sure modes adhere to size constraints
  729.  * @dev: DRM device
  730.  * @mode_list: list of modes to check
  731.  * @maxX: maximum width
  732.  * @maxY: maximum height
  733.  * @maxPitch: max pitch
  734.  *
  735.  * LOCKING:
  736.  * Caller must hold a lock protecting @mode_list.
  737.  *
  738.  * The DRM device (@dev) has size and pitch limits.  Here we validate the
  739.  * modes we probed for @dev against those limits and set their status as
  740.  * necessary.
  741.  */
  742. void drm_mode_validate_size(struct drm_device *dev,
  743.                             struct list_head *mode_list,
  744.                             int maxX, int maxY, int maxPitch)
  745. {
  746.         struct drm_display_mode *mode;
  747.  
  748.         list_for_each_entry(mode, mode_list, head) {
  749.                 if (maxPitch > 0 && mode->hdisplay > maxPitch)
  750.                         mode->status = MODE_BAD_WIDTH;
  751.  
  752.                 if (maxX > 0 && mode->hdisplay > maxX)
  753.                         mode->status = MODE_VIRTUAL_X;
  754.  
  755.                 if (maxY > 0 && mode->vdisplay > maxY)
  756.                         mode->status = MODE_VIRTUAL_Y;
  757.         }
  758. }
  759. EXPORT_SYMBOL(drm_mode_validate_size);
  760.  
  761. /**
  762.  * drm_mode_validate_clocks - validate modes against clock limits
  763.  * @dev: DRM device
  764.  * @mode_list: list of modes to check
  765.  * @min: minimum clock rate array
  766.  * @max: maximum clock rate array
  767.  * @n_ranges: number of clock ranges (size of arrays)
  768.  *
  769.  * LOCKING:
  770.  * Caller must hold a lock protecting @mode_list.
  771.  *
  772.  * Some code may need to check a mode list against the clock limits of the
  773.  * device in question.  This function walks the mode list, testing to make
  774.  * sure each mode falls within a given range (defined by @min and @max
  775.  * arrays) and sets @mode->status as needed.
  776.  */
  777. void drm_mode_validate_clocks(struct drm_device *dev,
  778.                               struct list_head *mode_list,
  779.                               int *min, int *max, int n_ranges)
  780. {
  781.         struct drm_display_mode *mode;
  782.         int i;
  783.  
  784.         list_for_each_entry(mode, mode_list, head) {
  785.                 bool good = false;
  786.                 for (i = 0; i < n_ranges; i++) {
  787.                         if (mode->clock >= min[i] && mode->clock <= max[i]) {
  788.                                 good = true;
  789.                                 break;
  790.                         }
  791.                 }
  792.                 if (!good)
  793.                         mode->status = MODE_CLOCK_RANGE;
  794.         }
  795. }
  796. EXPORT_SYMBOL(drm_mode_validate_clocks);
  797.  
  798. /**
  799.  * drm_mode_prune_invalid - remove invalid modes from mode list
  800.  * @dev: DRM device
  801.  * @mode_list: list of modes to check
  802.  * @verbose: be verbose about it
  803.  *
  804.  * LOCKING:
  805.  * Caller must hold a lock protecting @mode_list.
  806.  *
  807.  * Once mode list generation is complete, a caller can use this routine to
  808.  * remove invalid modes from a mode list.  If any of the modes have a
  809.  * status other than %MODE_OK, they are removed from @mode_list and freed.
  810.  */
  811. void drm_mode_prune_invalid(struct drm_device *dev,
  812.                             struct list_head *mode_list, bool verbose)
  813. {
  814.         struct drm_display_mode *mode, *t;
  815.  
  816.         list_for_each_entry_safe(mode, t, mode_list, head) {
  817.                 if (mode->status != MODE_OK) {
  818.                         list_del(&mode->head);
  819.                         if (verbose) {
  820.                                 drm_mode_debug_printmodeline(mode);
  821.                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
  822.                                         mode->name, mode->status);
  823.                         }
  824.                         drm_mode_destroy(dev, mode);
  825.                 }
  826.         }
  827. }
  828. EXPORT_SYMBOL(drm_mode_prune_invalid);
  829.  
  830. /**
  831.  * drm_mode_compare - compare modes for favorability
  832.  * @lh_a: list_head for first mode
  833.  * @lh_b: list_head for second mode
  834.  *
  835.  * LOCKING:
  836.  * None.
  837.  *
  838.  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
  839.  * which is better.
  840.  *
  841.  * RETURNS:
  842.  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
  843.  * positive if @lh_b is better than @lh_a.
  844.  */
  845. static int drm_mode_compare(struct list_head *lh_a, struct list_head *lh_b)
  846. {
  847.         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
  848.         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
  849.         int diff;
  850.  
  851.         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
  852.                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
  853.         if (diff)
  854.                 return diff;
  855.         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
  856.         if (diff)
  857.                 return diff;
  858.         diff = b->clock - a->clock;
  859.         return diff;
  860. }
  861.  
  862. /* FIXME: what we don't have a list sort function? */
  863. /* list sort from Mark J Roberts (mjr@znex.org) */
  864. void list_sort(struct list_head *head,
  865.                int (*cmp)(struct list_head *a, struct list_head *b))
  866. {
  867.         struct list_head *p, *q, *e, *list, *tail, *oldhead;
  868.         int insize, nmerges, psize, qsize, i;
  869.  
  870.         list = head->next;
  871.         list_del(head);
  872.         insize = 1;
  873.         for (;;) {
  874.                 p = oldhead = list;
  875.                 list = tail = NULL;
  876.                 nmerges = 0;
  877.  
  878.                 while (p) {
  879.                         nmerges++;
  880.                         q = p;
  881.                         psize = 0;
  882.                         for (i = 0; i < insize; i++) {
  883.                                 psize++;
  884.                                 q = q->next == oldhead ? NULL : q->next;
  885.                                 if (!q)
  886.                                         break;
  887.                         }
  888.  
  889.                         qsize = insize;
  890.                         while (psize > 0 || (qsize > 0 && q)) {
  891.                                 if (!psize) {
  892.                                         e = q;
  893.                                         q = q->next;
  894.                                         qsize--;
  895.                                         if (q == oldhead)
  896.                                                 q = NULL;
  897.                                 } else if (!qsize || !q) {
  898.                                         e = p;
  899.                                         p = p->next;
  900.                                         psize--;
  901.                                         if (p == oldhead)
  902.                                                 p = NULL;
  903.                                 } else if (cmp(p, q) <= 0) {
  904.                                         e = p;
  905.                                         p = p->next;
  906.                                         psize--;
  907.                                         if (p == oldhead)
  908.                                                 p = NULL;
  909.                                 } else {
  910.                                         e = q;
  911.                                         q = q->next;
  912.                                         qsize--;
  913.                                         if (q == oldhead)
  914.                                                 q = NULL;
  915.                                 }
  916.                                 if (tail)
  917.                                         tail->next = e;
  918.                                 else
  919.                                         list = e;
  920.                                 e->prev = tail;
  921.                                 tail = e;
  922.                         }
  923.                         p = q;
  924.                 }
  925.  
  926.                 tail->next = list;
  927.                 list->prev = tail;
  928.  
  929.                 if (nmerges <= 1)
  930.                         break;
  931.  
  932.                 insize *= 2;
  933.         }
  934.  
  935.         head->next = list;
  936.         head->prev = list->prev;
  937.         list->prev->next = head;
  938.         list->prev = head;
  939. }
  940.  
  941. /**
  942.  * drm_mode_sort - sort mode list
  943.  * @mode_list: list to sort
  944.  *
  945.  * LOCKING:
  946.  * Caller must hold a lock protecting @mode_list.
  947.  *
  948.  * Sort @mode_list by favorability, putting good modes first.
  949.  */
  950. void drm_mode_sort(struct list_head *mode_list)
  951. {
  952.         list_sort(mode_list, drm_mode_compare);
  953. }
  954. EXPORT_SYMBOL(drm_mode_sort);
  955.  
  956. /**
  957.  * drm_mode_connector_list_update - update the mode list for the connector
  958.  * @connector: the connector to update
  959.  *
  960.  * LOCKING:
  961.  * Caller must hold a lock protecting @mode_list.
  962.  *
  963.  * This moves the modes from the @connector probed_modes list
  964.  * to the actual mode list. It compares the probed mode against the current
  965.  * list and only adds different modes. All modes unverified after this point
  966.  * will be removed by the prune invalid modes.
  967.  */
  968. void drm_mode_connector_list_update(struct drm_connector *connector)
  969. {
  970.         struct drm_display_mode *mode;
  971.         struct drm_display_mode *pmode, *pt;
  972.         int found_it;
  973.  
  974.         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
  975.                                  head) {
  976.                 found_it = 0;
  977.                 /* go through current modes checking for the new probed mode */
  978.                 list_for_each_entry(mode, &connector->modes, head) {
  979.                         if (drm_mode_equal(pmode, mode)) {
  980.                                 found_it = 1;
  981.                                 /* if equal delete the probed mode */
  982.                                 mode->status = pmode->status;
  983.                                 /* Merge type bits together */
  984.                                 mode->type |= pmode->type;
  985.                                 list_del(&pmode->head);
  986.                                 drm_mode_destroy(connector->dev, pmode);
  987.                                 break;
  988.                         }
  989.                 }
  990.  
  991.                 if (!found_it) {
  992.                         list_move_tail(&pmode->head, &connector->modes);
  993.                 }
  994.         }
  995. }
  996. EXPORT_SYMBOL(drm_mode_connector_list_update);
  997.