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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 "drmP.h"
  36. #include "drm.h"
  37. #include "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(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.vesa.org/public/CVT/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.         }
  256.         /* 15/13. Find pixel clock frequency (kHz for xf86) */
  257.         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
  258.         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
  259.         /* 18/16. Find actual vertical frame frequency */
  260.         /* ignore - just set the mode flag for interlaced */
  261.         if (interlaced)
  262.                 drm_mode->vtotal *= 2;
  263.         /* Fill the mode line name */
  264.         drm_mode_set_name(drm_mode);
  265.         if (reduced)
  266.                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
  267.                                         DRM_MODE_FLAG_NVSYNC);
  268.         else
  269.                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
  270.                                         DRM_MODE_FLAG_NHSYNC);
  271.         if (interlaced)
  272.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  273.  
  274.     return drm_mode;
  275. }
  276. EXPORT_SYMBOL(drm_cvt_mode);
  277.  
  278. /**
  279.  * drm_gtf_mode - create the modeline based on GTF algorithm
  280.  *
  281.  * @dev         :drm device
  282.  * @hdisplay    :hdisplay size
  283.  * @vdisplay    :vdisplay size
  284.  * @vrefresh    :vrefresh rate.
  285.  * @interlaced  :whether the interlace is supported
  286.  * @margins     :whether the margin is supported
  287.  *
  288.  * LOCKING.
  289.  * none.
  290.  *
  291.  * return the modeline based on GTF algorithm
  292.  *
  293.  * This function is to create the modeline based on the GTF algorithm.
  294.  * Generalized Timing Formula is derived from:
  295.  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  296.  *      available at http://www.vesa.org
  297.  *
  298.  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
  299.  * What I have done is to translate it by using integer calculation.
  300.  * I also refer to the function of fb_get_mode in the file of
  301.  * drivers/video/fbmon.c
  302.  */
  303. struct drm_display_mode *drm_gtf_mode(struct drm_device *dev, int hdisplay,
  304.                                       int vdisplay, int vrefresh,
  305.                                       bool interlaced, int margins)
  306. {
  307.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  308. #define GTF_MARGIN_PERCENTAGE           18
  309.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  310. #define GTF_CELL_GRAN                   8
  311.         /* 3) Minimum vertical porch (lines) - default 3 */
  312. #define GTF_MIN_V_PORCH                 1
  313.         /* width of vsync in lines */
  314. #define V_SYNC_RQD                      3
  315.         /* width of hsync as % of total line */
  316. #define H_SYNC_PERCENT                  8
  317.         /* min time of vsync + back porch (microsec) */
  318. #define MIN_VSYNC_PLUS_BP               550
  319.         /* blanking formula gradient */
  320. #define GTF_M                           600
  321.         /* blanking formula offset */
  322. #define GTF_C                           40
  323.         /* blanking formula scaling factor */
  324. #define GTF_K                           128
  325.         /* blanking formula scaling factor */
  326. #define GTF_J                           20
  327.         /* C' and M' are part of the Blanking Duty Cycle computation */
  328. #define GTF_C_PRIME             (((GTF_C - GTF_J) * GTF_K / 256) + GTF_J)
  329. #define GTF_M_PRIME             (GTF_K * GTF_M / 256)
  330.         struct drm_display_mode *drm_mode;
  331.         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
  332.         int top_margin, bottom_margin;
  333.         int interlace;
  334.         unsigned int hfreq_est;
  335.         int vsync_plus_bp, vback_porch;
  336.         unsigned int vtotal_lines, vfieldrate_est, hperiod;
  337.         unsigned int vfield_rate, vframe_rate;
  338.         int left_margin, right_margin;
  339.         unsigned int total_active_pixels, ideal_duty_cycle;
  340.         unsigned int hblank, total_pixels, pixel_freq;
  341.         int hsync, hfront_porch, vodd_front_porch_lines;
  342.         unsigned int tmp1, tmp2;
  343.  
  344.         drm_mode = drm_mode_create(dev);
  345.         if (!drm_mode)
  346.                 return NULL;
  347.  
  348.         /* 1. In order to give correct results, the number of horizontal
  349.          * pixels requested is first processed to ensure that it is divisible
  350.          * by the character size, by rounding it to the nearest character
  351.          * cell boundary:
  352.          */
  353.         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  354.         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
  355.  
  356.         /* 2. If interlace is requested, the number of vertical lines assumed
  357.          * by the calculation must be halved, as the computation calculates
  358.          * the number of vertical lines per field.
  359.          */
  360.         if (interlaced)
  361.                 vdisplay_rnd = vdisplay / 2;
  362.         else
  363.                 vdisplay_rnd = vdisplay;
  364.  
  365.         /* 3. Find the frame rate required: */
  366.         if (interlaced)
  367.                 vfieldrate_rqd = vrefresh * 2;
  368.         else
  369.                 vfieldrate_rqd = vrefresh;
  370.  
  371.         /* 4. Find number of lines in Top margin: */
  372.         top_margin = 0;
  373.         if (margins)
  374.                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  375.                                 1000;
  376.         /* 5. Find number of lines in bottom margin: */
  377.         bottom_margin = top_margin;
  378.  
  379.         /* 6. If interlace is required, then set variable interlace: */
  380.         if (interlaced)
  381.                 interlace = 1;
  382.         else
  383.                 interlace = 0;
  384.  
  385.         /* 7. Estimate the Horizontal frequency */
  386.         {
  387.                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
  388.                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
  389.                                 2 + interlace;
  390.                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
  391.         }
  392.  
  393.         /* 8. Find the number of lines in V sync + back porch */
  394.         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
  395.         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
  396.         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
  397.         /*  9. Find the number of lines in V back porch alone: */
  398.         vback_porch = vsync_plus_bp - V_SYNC_RQD;
  399.         /*  10. Find the total number of lines in Vertical field period: */
  400.         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
  401.                         vsync_plus_bp + GTF_MIN_V_PORCH;
  402.         /*  11. Estimate the Vertical field frequency: */
  403.         vfieldrate_est = hfreq_est / vtotal_lines;
  404.         /*  12. Find the actual horizontal period: */
  405.         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
  406.  
  407.         /*  13. Find the actual Vertical field frequency: */
  408.         vfield_rate = hfreq_est / vtotal_lines;
  409.         /*  14. Find the Vertical frame frequency: */
  410.         if (interlaced)
  411.                 vframe_rate = vfield_rate / 2;
  412.         else
  413.                 vframe_rate = vfield_rate;
  414.         /*  15. Find number of pixels in left margin: */
  415.         if (margins)
  416.                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  417.                                 1000;
  418.         else
  419.                 left_margin = 0;
  420.  
  421.         /* 16.Find number of pixels in right margin: */
  422.         right_margin = left_margin;
  423.         /* 17.Find total number of active pixels in image and left and right */
  424.         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
  425.         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
  426.         ideal_duty_cycle = GTF_C_PRIME * 1000 -
  427.                                 (GTF_M_PRIME * 1000000 / hfreq_est);
  428.         /* 19.Find the number of pixels in the blanking time to the nearest
  429.          * double character cell: */
  430.         hblank = total_active_pixels * ideal_duty_cycle /
  431.                         (100000 - ideal_duty_cycle);
  432.         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
  433.         hblank = hblank * 2 * GTF_CELL_GRAN;
  434.         /* 20.Find total number of pixels: */
  435.         total_pixels = total_active_pixels + hblank;
  436.         /* 21.Find pixel clock frequency: */
  437.         pixel_freq = total_pixels * hfreq_est / 1000;
  438.         /* Stage 1 computations are now complete; I should really pass
  439.          * the results to another function and do the Stage 2 computations,
  440.          * but I only need a few more values so I'll just append the
  441.          * computations here for now */
  442.         /* 17. Find the number of pixels in the horizontal sync period: */
  443.         hsync = H_SYNC_PERCENT * total_pixels / 100;
  444.         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  445.         hsync = hsync * GTF_CELL_GRAN;
  446.         /* 18. Find the number of pixels in horizontal front porch period */
  447.         hfront_porch = hblank / 2 - hsync;
  448.         /*  36. Find the number of lines in the odd front porch period: */
  449.         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
  450.  
  451.         /* finally, pack the results in the mode struct */
  452.         drm_mode->hdisplay = hdisplay_rnd;
  453.         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
  454.         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
  455.         drm_mode->htotal = total_pixels;
  456.         drm_mode->vdisplay = vdisplay_rnd;
  457.         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
  458.         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
  459.         drm_mode->vtotal = vtotal_lines;
  460.  
  461.         drm_mode->clock = pixel_freq;
  462.  
  463.         drm_mode_set_name(drm_mode);
  464.         drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
  465.  
  466.         if (interlaced) {
  467.                 drm_mode->vtotal *= 2;
  468.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  469.         }
  470.  
  471.         return drm_mode;
  472. }
  473. EXPORT_SYMBOL(drm_gtf_mode);
  474. /**
  475.  * drm_mode_set_name - set the name on a mode
  476.  * @mode: name will be set in this mode
  477.  *
  478.  * LOCKING:
  479.  * None.
  480.  *
  481.  * Set the name of @mode to a standard format.
  482.  */
  483. void drm_mode_set_name(struct drm_display_mode *mode)
  484. {
  485.         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d", mode->hdisplay,
  486.                  mode->vdisplay);
  487. }
  488. EXPORT_SYMBOL(drm_mode_set_name);
  489.  
  490. /**
  491.  * drm_mode_list_concat - move modes from one list to another
  492.  * @head: source list
  493.  * @new: dst list
  494.  *
  495.  * LOCKING:
  496.  * Caller must ensure both lists are locked.
  497.  *
  498.  * Move all the modes from @head to @new.
  499.  */
  500. void drm_mode_list_concat(struct list_head *head, struct list_head *new)
  501. {
  502.  
  503.         struct list_head *entry, *tmp;
  504.  
  505.         list_for_each_safe(entry, tmp, head) {
  506.                 list_move_tail(entry, new);
  507.         }
  508. }
  509. EXPORT_SYMBOL(drm_mode_list_concat);
  510.  
  511. /**
  512.  * drm_mode_width - get the width of a mode
  513.  * @mode: mode
  514.  *
  515.  * LOCKING:
  516.  * None.
  517.  *
  518.  * Return @mode's width (hdisplay) value.
  519.  *
  520.  * FIXME: is this needed?
  521.  *
  522.  * RETURNS:
  523.  * @mode->hdisplay
  524.  */
  525. int drm_mode_width(struct drm_display_mode *mode)
  526. {
  527.         return mode->hdisplay;
  528.  
  529. }
  530. EXPORT_SYMBOL(drm_mode_width);
  531.  
  532. /**
  533.  * drm_mode_height - get the height of a mode
  534.  * @mode: mode
  535.  *
  536.  * LOCKING:
  537.  * None.
  538.  *
  539.  * Return @mode's height (vdisplay) value.
  540.  *
  541.  * FIXME: is this needed?
  542.  *
  543.  * RETURNS:
  544.  * @mode->vdisplay
  545.  */
  546. int drm_mode_height(struct drm_display_mode *mode)
  547. {
  548.         return mode->vdisplay;
  549. }
  550. EXPORT_SYMBOL(drm_mode_height);
  551.  
  552. /** drm_mode_hsync - get the hsync of a mode
  553.  * @mode: mode
  554.  *
  555.  * LOCKING:
  556.  * None.
  557.  *
  558.  * Return @modes's hsync rate in kHz, rounded to the nearest int.
  559.  */
  560. int drm_mode_hsync(struct drm_display_mode *mode)
  561. {
  562.         unsigned int calc_val;
  563.  
  564.         if (mode->hsync)
  565.                 return mode->hsync;
  566.  
  567.         if (mode->htotal < 0)
  568.                 return 0;
  569.  
  570.         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
  571.         calc_val += 500;                                /* round to 1000Hz */
  572.         calc_val /= 1000;                               /* truncate to kHz */
  573.  
  574.         return calc_val;
  575. }
  576. EXPORT_SYMBOL(drm_mode_hsync);
  577.  
  578. /**
  579.  * drm_mode_vrefresh - get the vrefresh of a mode
  580.  * @mode: mode
  581.  *
  582.  * LOCKING:
  583.  * None.
  584.  *
  585.  * Return @mode's vrefresh rate in Hz or calculate it if necessary.
  586.  *
  587.  * FIXME: why is this needed?  shouldn't vrefresh be set already?
  588.  *
  589.  * RETURNS:
  590.  * Vertical refresh rate. It will be the result of actual value plus 0.5.
  591.  * If it is 70.288, it will return 70Hz.
  592.  * If it is 59.6, it will return 60Hz.
  593.  */
  594. int drm_mode_vrefresh(struct drm_display_mode *mode)
  595. {
  596.         int refresh = 0;
  597.         unsigned int calc_val;
  598.  
  599.         if (mode->vrefresh > 0)
  600.                 refresh = mode->vrefresh;
  601.         else if (mode->htotal > 0 && mode->vtotal > 0) {
  602.                 int vtotal;
  603.                 vtotal = mode->vtotal;
  604.                 /* work out vrefresh the value will be x1000 */
  605.                 calc_val = (mode->clock * 1000);
  606.                 calc_val /= mode->htotal;
  607.                 refresh = (calc_val + vtotal / 2) / vtotal;
  608.  
  609.                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  610.                         refresh *= 2;
  611.                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  612.                         refresh /= 2;
  613.                 if (mode->vscan > 1)
  614.                         refresh /= mode->vscan;
  615.         }
  616.         return refresh;
  617. }
  618. EXPORT_SYMBOL(drm_mode_vrefresh);
  619.  
  620. /**
  621.  * drm_mode_set_crtcinfo - set CRTC modesetting parameters
  622.  * @p: mode
  623.  * @adjust_flags: unused? (FIXME)
  624.  *
  625.  * LOCKING:
  626.  * None.
  627.  *
  628.  * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
  629.  */
  630. void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
  631. {
  632.         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
  633.                 return;
  634.  
  635.         p->crtc_hdisplay = p->hdisplay;
  636.         p->crtc_hsync_start = p->hsync_start;
  637.         p->crtc_hsync_end = p->hsync_end;
  638.         p->crtc_htotal = p->htotal;
  639.         p->crtc_hskew = p->hskew;
  640.         p->crtc_vdisplay = p->vdisplay;
  641.         p->crtc_vsync_start = p->vsync_start;
  642.         p->crtc_vsync_end = p->vsync_end;
  643.         p->crtc_vtotal = p->vtotal;
  644.  
  645.         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
  646.                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
  647.                         p->crtc_vdisplay /= 2;
  648.                         p->crtc_vsync_start /= 2;
  649.                         p->crtc_vsync_end /= 2;
  650.                         p->crtc_vtotal /= 2;
  651.                 }
  652.  
  653.                 p->crtc_vtotal |= 1;
  654.         }
  655.  
  656.         if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
  657.                 p->crtc_vdisplay *= 2;
  658.                 p->crtc_vsync_start *= 2;
  659.                 p->crtc_vsync_end *= 2;
  660.                 p->crtc_vtotal *= 2;
  661.         }
  662.  
  663.         if (p->vscan > 1) {
  664.                 p->crtc_vdisplay *= p->vscan;
  665.                 p->crtc_vsync_start *= p->vscan;
  666.                 p->crtc_vsync_end *= p->vscan;
  667.                 p->crtc_vtotal *= p->vscan;
  668.         }
  669.  
  670.         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
  671.         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
  672.         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
  673.         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
  674.  
  675.         p->crtc_hadjusted = false;
  676.         p->crtc_vadjusted = false;
  677. }
  678. EXPORT_SYMBOL(drm_mode_set_crtcinfo);
  679.  
  680.  
  681. /**
  682.  * drm_mode_duplicate - allocate and duplicate an existing mode
  683.  * @m: mode to duplicate
  684.  *
  685.  * LOCKING:
  686.  * None.
  687.  *
  688.  * Just allocate a new mode, copy the existing mode into it, and return
  689.  * a pointer to it.  Used to create new instances of established modes.
  690.  */
  691. struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
  692.                                             struct drm_display_mode *mode)
  693. {
  694.         struct drm_display_mode *nmode;
  695.         int new_id;
  696.  
  697.         nmode = drm_mode_create(dev);
  698.         if (!nmode)
  699.                 return NULL;
  700.  
  701.         new_id = nmode->base.id;
  702.         *nmode = *mode;
  703.         nmode->base.id = new_id;
  704.         INIT_LIST_HEAD(&nmode->head);
  705.         return nmode;
  706. }
  707. EXPORT_SYMBOL(drm_mode_duplicate);
  708.  
  709. /**
  710.  * drm_mode_equal - test modes for equality
  711.  * @mode1: first mode
  712.  * @mode2: second mode
  713.  *
  714.  * LOCKING:
  715.  * None.
  716.  *
  717.  * Check to see if @mode1 and @mode2 are equivalent.
  718.  *
  719.  * RETURNS:
  720.  * True if the modes are equal, false otherwise.
  721.  */
  722. bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
  723. {
  724.         /* do clock check convert to PICOS so fb modes get matched
  725.          * the same */
  726.         if (mode1->clock && mode2->clock) {
  727.                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
  728.                         return false;
  729.         } else if (mode1->clock != mode2->clock)
  730.                 return false;
  731.  
  732.         if (mode1->hdisplay == mode2->hdisplay &&
  733.             mode1->hsync_start == mode2->hsync_start &&
  734.             mode1->hsync_end == mode2->hsync_end &&
  735.             mode1->htotal == mode2->htotal &&
  736.             mode1->hskew == mode2->hskew &&
  737.             mode1->vdisplay == mode2->vdisplay &&
  738.             mode1->vsync_start == mode2->vsync_start &&
  739.             mode1->vsync_end == mode2->vsync_end &&
  740.             mode1->vtotal == mode2->vtotal &&
  741.             mode1->vscan == mode2->vscan &&
  742.             mode1->flags == mode2->flags)
  743.                 return true;
  744.  
  745.         return false;
  746. }
  747. EXPORT_SYMBOL(drm_mode_equal);
  748.  
  749. /**
  750.  * drm_mode_validate_size - make sure modes adhere to size constraints
  751.  * @dev: DRM device
  752.  * @mode_list: list of modes to check
  753.  * @maxX: maximum width
  754.  * @maxY: maximum height
  755.  * @maxPitch: max pitch
  756.  *
  757.  * LOCKING:
  758.  * Caller must hold a lock protecting @mode_list.
  759.  *
  760.  * The DRM device (@dev) has size and pitch limits.  Here we validate the
  761.  * modes we probed for @dev against those limits and set their status as
  762.  * necessary.
  763.  */
  764. void drm_mode_validate_size(struct drm_device *dev,
  765.                             struct list_head *mode_list,
  766.                             int maxX, int maxY, int maxPitch)
  767. {
  768.         struct drm_display_mode *mode;
  769.  
  770.         list_for_each_entry(mode, mode_list, head) {
  771.                 if (maxPitch > 0 && mode->hdisplay > maxPitch)
  772.                         mode->status = MODE_BAD_WIDTH;
  773.  
  774.                 if (maxX > 0 && mode->hdisplay > maxX)
  775.                         mode->status = MODE_VIRTUAL_X;
  776.  
  777.                 if (maxY > 0 && mode->vdisplay > maxY)
  778.                         mode->status = MODE_VIRTUAL_Y;
  779.         }
  780. }
  781. EXPORT_SYMBOL(drm_mode_validate_size);
  782.  
  783. /**
  784.  * drm_mode_validate_clocks - validate modes against clock limits
  785.  * @dev: DRM device
  786.  * @mode_list: list of modes to check
  787.  * @min: minimum clock rate array
  788.  * @max: maximum clock rate array
  789.  * @n_ranges: number of clock ranges (size of arrays)
  790.  *
  791.  * LOCKING:
  792.  * Caller must hold a lock protecting @mode_list.
  793.  *
  794.  * Some code may need to check a mode list against the clock limits of the
  795.  * device in question.  This function walks the mode list, testing to make
  796.  * sure each mode falls within a given range (defined by @min and @max
  797.  * arrays) and sets @mode->status as needed.
  798.  */
  799. void drm_mode_validate_clocks(struct drm_device *dev,
  800.                               struct list_head *mode_list,
  801.                               int *min, int *max, int n_ranges)
  802. {
  803.         struct drm_display_mode *mode;
  804.         int i;
  805.  
  806.         list_for_each_entry(mode, mode_list, head) {
  807.                 bool good = false;
  808.                 for (i = 0; i < n_ranges; i++) {
  809.                         if (mode->clock >= min[i] && mode->clock <= max[i]) {
  810.                                 good = true;
  811.                                 break;
  812.                         }
  813.                 }
  814.                 if (!good)
  815.                         mode->status = MODE_CLOCK_RANGE;
  816.         }
  817. }
  818. EXPORT_SYMBOL(drm_mode_validate_clocks);
  819.  
  820. /**
  821.  * drm_mode_prune_invalid - remove invalid modes from mode list
  822.  * @dev: DRM device
  823.  * @mode_list: list of modes to check
  824.  * @verbose: be verbose about it
  825.  *
  826.  * LOCKING:
  827.  * Caller must hold a lock protecting @mode_list.
  828.  *
  829.  * Once mode list generation is complete, a caller can use this routine to
  830.  * remove invalid modes from a mode list.  If any of the modes have a
  831.  * status other than %MODE_OK, they are removed from @mode_list and freed.
  832.  */
  833. void drm_mode_prune_invalid(struct drm_device *dev,
  834.                             struct list_head *mode_list, bool verbose)
  835. {
  836.         struct drm_display_mode *mode, *t;
  837.  
  838.         list_for_each_entry_safe(mode, t, mode_list, head) {
  839.                 if (mode->status != MODE_OK) {
  840.                         list_del(&mode->head);
  841.                         if (verbose) {
  842.                                 drm_mode_debug_printmodeline(mode);
  843.                                 DRM_DEBUG_KMS("Not using %s mode %d\n",
  844.                                         mode->name, mode->status);
  845.                         }
  846.                         drm_mode_destroy(dev, mode);
  847.                 }
  848.         }
  849. }
  850. EXPORT_SYMBOL(drm_mode_prune_invalid);
  851.  
  852. /**
  853.  * drm_mode_compare - compare modes for favorability
  854.  * @priv: unused
  855.  * @lh_a: list_head for first mode
  856.  * @lh_b: list_head for second mode
  857.  *
  858.  * LOCKING:
  859.  * None.
  860.  *
  861.  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
  862.  * which is better.
  863.  *
  864.  * RETURNS:
  865.  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
  866.  * positive if @lh_b is better than @lh_a.
  867.  */
  868. static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
  869. {
  870.         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
  871.         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
  872.         int diff;
  873.  
  874.         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
  875.                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
  876.         if (diff)
  877.                 return diff;
  878.         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
  879.         if (diff)
  880.                 return diff;
  881.         diff = b->clock - a->clock;
  882.         return diff;
  883. }
  884.  
  885. /**
  886.  * drm_mode_sort - sort mode list
  887.  * @mode_list: list to sort
  888.  *
  889.  * LOCKING:
  890.  * Caller must hold a lock protecting @mode_list.
  891.  *
  892.  * Sort @mode_list by favorability, putting good modes first.
  893.  */
  894. void drm_mode_sort(struct list_head *mode_list)
  895. {
  896.         list_sort(NULL, mode_list, drm_mode_compare);
  897. }
  898. EXPORT_SYMBOL(drm_mode_sort);
  899.  
  900. /**
  901.  * drm_mode_connector_list_update - update the mode list for the connector
  902.  * @connector: the connector to update
  903.  *
  904.  * LOCKING:
  905.  * Caller must hold a lock protecting @mode_list.
  906.  *
  907.  * This moves the modes from the @connector probed_modes list
  908.  * to the actual mode list. It compares the probed mode against the current
  909.  * list and only adds different modes. All modes unverified after this point
  910.  * will be removed by the prune invalid modes.
  911.  */
  912. void drm_mode_connector_list_update(struct drm_connector *connector)
  913. {
  914.         struct drm_display_mode *mode;
  915.         struct drm_display_mode *pmode, *pt;
  916.         int found_it;
  917.  
  918.         list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
  919.                                  head) {
  920.                 found_it = 0;
  921.                 /* go through current modes checking for the new probed mode */
  922.                 list_for_each_entry(mode, &connector->modes, head) {
  923.                         if (drm_mode_equal(pmode, mode)) {
  924.                                 found_it = 1;
  925.                                 /* if equal delete the probed mode */
  926.                                 mode->status = pmode->status;
  927.                                 /* Merge type bits together */
  928.                                 mode->type |= pmode->type;
  929.                                 list_del(&pmode->head);
  930.                                 drm_mode_destroy(connector->dev, pmode);
  931.                                 break;
  932.                         }
  933.                 }
  934.  
  935.                 if (!found_it) {
  936.                         list_move_tail(&pmode->head, &connector->modes);
  937.                 }
  938.         }
  939. }
  940. EXPORT_SYMBOL(drm_mode_connector_list_update);
  941.