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  1. /*
  2.  * Copyright © 1997-2003 by The XFree86 Project, Inc.
  3.  * Copyright © 2007 Dave Airlie
  4.  * Copyright © 2007-2008 Intel Corporation
  5.  *   Jesse Barnes <jesse.barnes@intel.com>
  6.  * Copyright 2005-2006 Luc Verhaegen
  7.  * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
  8.  *
  9.  * Permission is hereby granted, free of charge, to any person obtaining a
  10.  * copy of this software and associated documentation files (the "Software"),
  11.  * to deal in the Software without restriction, including without limitation
  12.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13.  * and/or sell copies of the Software, and to permit persons to whom the
  14.  * Software is furnished to do so, subject to the following conditions:
  15.  *
  16.  * The above copyright notice and this permission notice shall be included in
  17.  * all copies or substantial portions of the Software.
  18.  *
  19.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25.  * OTHER DEALINGS IN THE SOFTWARE.
  26.  *
  27.  * Except as contained in this notice, the name of the copyright holder(s)
  28.  * and author(s) shall not be used in advertising or otherwise to promote
  29.  * the sale, use or other dealings in this Software without prior written
  30.  * authorization from the copyright holder(s) and author(s).
  31.  */
  32.  
  33. #include <linux/list.h>
  34. #include <linux/list_sort.h>
  35. #include <linux/export.h>
  36. #include <drm/drmP.h>
  37. #include <drm/drm_crtc.h>
  38. #include <video/of_videomode.h>
  39. #include <video/videomode.h>
  40. #include <drm/drm_modes.h>
  41.  
  42. #include "drm_crtc_internal.h"
  43.  
  44. /**
  45.  * drm_mode_debug_printmodeline - print a mode to dmesg
  46.  * @mode: mode to print
  47.  *
  48.  * Describe @mode using DRM_DEBUG.
  49.  */
  50. void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
  51. {
  52.         DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
  53.                         "0x%x 0x%x\n",
  54.                 mode->base.id, mode->name, mode->vrefresh, mode->clock,
  55.                 mode->hdisplay, mode->hsync_start,
  56.                 mode->hsync_end, mode->htotal,
  57.                 mode->vdisplay, mode->vsync_start,
  58.                 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
  59. }
  60. EXPORT_SYMBOL(drm_mode_debug_printmodeline);
  61.  
  62. /**
  63.  * drm_mode_create - create a new display mode
  64.  * @dev: DRM device
  65.  *
  66.  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
  67.  * and return it.
  68.  *
  69.  * Returns:
  70.  * Pointer to new mode on success, NULL on error.
  71.  */
  72. struct drm_display_mode *drm_mode_create(struct drm_device *dev)
  73. {
  74.         struct drm_display_mode *nmode;
  75.  
  76.         nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
  77.         if (!nmode)
  78.                 return NULL;
  79.  
  80.         if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
  81.                 kfree(nmode);
  82.                 return NULL;
  83.         }
  84.  
  85.         return nmode;
  86. }
  87. EXPORT_SYMBOL(drm_mode_create);
  88.  
  89. /**
  90.  * drm_mode_destroy - remove a mode
  91.  * @dev: DRM device
  92.  * @mode: mode to remove
  93.  *
  94.  * Release @mode's unique ID, then free it @mode structure itself using kfree.
  95.  */
  96. void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
  97. {
  98.         if (!mode)
  99.                 return;
  100.  
  101.         drm_mode_object_put(dev, &mode->base);
  102.  
  103.         kfree(mode);
  104. }
  105. EXPORT_SYMBOL(drm_mode_destroy);
  106.  
  107. /**
  108.  * drm_mode_probed_add - add a mode to a connector's probed_mode list
  109.  * @connector: connector the new mode
  110.  * @mode: mode data
  111.  *
  112.  * Add @mode to @connector's probed_mode list for later use. This list should
  113.  * then in a second step get filtered and all the modes actually supported by
  114.  * the hardware moved to the @connector's modes list.
  115.  */
  116. void drm_mode_probed_add(struct drm_connector *connector,
  117.                          struct drm_display_mode *mode)
  118. {
  119.         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
  120.  
  121.         list_add_tail(&mode->head, &connector->probed_modes);
  122. }
  123. EXPORT_SYMBOL(drm_mode_probed_add);
  124.  
  125. /**
  126.  * drm_cvt_mode -create a modeline based on the CVT algorithm
  127.  * @dev: drm device
  128.  * @hdisplay: hdisplay size
  129.  * @vdisplay: vdisplay size
  130.  * @vrefresh: vrefresh rate
  131.  * @reduced: whether to use reduced blanking
  132.  * @interlaced: whether to compute an interlaced mode
  133.  * @margins: whether to add margins (borders)
  134.  *
  135.  * This function is called to generate the modeline based on CVT algorithm
  136.  * according to the hdisplay, vdisplay, vrefresh.
  137.  * It is based from the VESA(TM) Coordinated Video Timing Generator by
  138.  * Graham Loveridge April 9, 2003 available at
  139.  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
  140.  *
  141.  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
  142.  * What I have done is to translate it by using integer calculation.
  143.  *
  144.  * Returns:
  145.  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
  146.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  147.  * when no mode could be allocated.
  148.  */
  149. struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
  150.                                       int vdisplay, int vrefresh,
  151.                                       bool reduced, bool interlaced, bool margins)
  152. {
  153. #define HV_FACTOR                       1000
  154.         /* 1) top/bottom margin size (% of height) - default: 1.8, */
  155. #define CVT_MARGIN_PERCENTAGE           18
  156.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  157. #define CVT_H_GRANULARITY               8
  158.         /* 3) Minimum vertical porch (lines) - default 3 */
  159. #define CVT_MIN_V_PORCH                 3
  160.         /* 4) Minimum number of vertical back porch lines - default 6 */
  161. #define CVT_MIN_V_BPORCH                6
  162.         /* Pixel Clock step (kHz) */
  163. #define CVT_CLOCK_STEP                  250
  164.         struct drm_display_mode *drm_mode;
  165.         unsigned int vfieldrate, hperiod;
  166.         int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
  167.         int interlace;
  168.  
  169.         /* allocate the drm_display_mode structure. If failure, we will
  170.          * return directly
  171.          */
  172.         drm_mode = drm_mode_create(dev);
  173.         if (!drm_mode)
  174.                 return NULL;
  175.  
  176.         /* the CVT default refresh rate is 60Hz */
  177.         if (!vrefresh)
  178.                 vrefresh = 60;
  179.  
  180.         /* the required field fresh rate */
  181.         if (interlaced)
  182.                 vfieldrate = vrefresh * 2;
  183.         else
  184.                 vfieldrate = vrefresh;
  185.  
  186.         /* horizontal pixels */
  187.         hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
  188.  
  189.         /* determine the left&right borders */
  190.         hmargin = 0;
  191.         if (margins) {
  192.                 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  193.                 hmargin -= hmargin % CVT_H_GRANULARITY;
  194.         }
  195.         /* find the total active pixels */
  196.         drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
  197.  
  198.         /* find the number of lines per field */
  199.         if (interlaced)
  200.                 vdisplay_rnd = vdisplay / 2;
  201.         else
  202.                 vdisplay_rnd = vdisplay;
  203.  
  204.         /* find the top & bottom borders */
  205.         vmargin = 0;
  206.         if (margins)
  207.                 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
  208.  
  209.         drm_mode->vdisplay = vdisplay + 2 * vmargin;
  210.  
  211.         /* Interlaced */
  212.         if (interlaced)
  213.                 interlace = 1;
  214.         else
  215.                 interlace = 0;
  216.  
  217.         /* Determine VSync Width from aspect ratio */
  218.         if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
  219.                 vsync = 4;
  220.         else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
  221.                 vsync = 5;
  222.         else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
  223.                 vsync = 6;
  224.         else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
  225.                 vsync = 7;
  226.         else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
  227.                 vsync = 7;
  228.         else /* custom */
  229.                 vsync = 10;
  230.  
  231.         if (!reduced) {
  232.                 /* simplify the GTF calculation */
  233.                 /* 4) Minimum time of vertical sync + back porch interval (µs)
  234.                  * default 550.0
  235.                  */
  236.                 int tmp1, tmp2;
  237. #define CVT_MIN_VSYNC_BP        550
  238.                 /* 3) Nominal HSync width (% of line period) - default 8 */
  239. #define CVT_HSYNC_PERCENTAGE    8
  240.                 unsigned int hblank_percentage;
  241.                 int vsyncandback_porch, vback_porch, hblank;
  242.  
  243.                 /* estimated the horizontal period */
  244.                 tmp1 = HV_FACTOR * 1000000  -
  245.                                 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
  246.                 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
  247.                                 interlace;
  248.                 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
  249.  
  250.                 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
  251.                 /* 9. Find number of lines in sync + backporch */
  252.                 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
  253.                         vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
  254.                 else
  255.                         vsyncandback_porch = tmp1;
  256.                 /* 10. Find number of lines in back porch */
  257.                 vback_porch = vsyncandback_porch - vsync;
  258.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
  259.                                 vsyncandback_porch + CVT_MIN_V_PORCH;
  260.                 /* 5) Definition of Horizontal blanking time limitation */
  261.                 /* Gradient (%/kHz) - default 600 */
  262. #define CVT_M_FACTOR    600
  263.                 /* Offset (%) - default 40 */
  264. #define CVT_C_FACTOR    40
  265.                 /* Blanking time scaling factor - default 128 */
  266. #define CVT_K_FACTOR    128
  267.                 /* Scaling factor weighting - default 20 */
  268. #define CVT_J_FACTOR    20
  269. #define CVT_M_PRIME     (CVT_M_FACTOR * CVT_K_FACTOR / 256)
  270. #define CVT_C_PRIME     ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
  271.                          CVT_J_FACTOR)
  272.                 /* 12. Find ideal blanking duty cycle from formula */
  273.                 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
  274.                                         hperiod / 1000;
  275.                 /* 13. Blanking time */
  276.                 if (hblank_percentage < 20 * HV_FACTOR)
  277.                         hblank_percentage = 20 * HV_FACTOR;
  278.                 hblank = drm_mode->hdisplay * hblank_percentage /
  279.                          (100 * HV_FACTOR - hblank_percentage);
  280.                 hblank -= hblank % (2 * CVT_H_GRANULARITY);
  281.                 /* 14. find the total pixels per line */
  282.                 drm_mode->htotal = drm_mode->hdisplay + hblank;
  283.                 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
  284.                 drm_mode->hsync_start = drm_mode->hsync_end -
  285.                         (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
  286.                 drm_mode->hsync_start += CVT_H_GRANULARITY -
  287.                         drm_mode->hsync_start % CVT_H_GRANULARITY;
  288.                 /* fill the Vsync values */
  289.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
  290.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  291.         } else {
  292.                 /* Reduced blanking */
  293.                 /* Minimum vertical blanking interval time (µs)- default 460 */
  294. #define CVT_RB_MIN_VBLANK       460
  295.                 /* Fixed number of clocks for horizontal sync */
  296. #define CVT_RB_H_SYNC           32
  297.                 /* Fixed number of clocks for horizontal blanking */
  298. #define CVT_RB_H_BLANK          160
  299.                 /* Fixed number of lines for vertical front porch - default 3*/
  300. #define CVT_RB_VFPORCH          3
  301.                 int vbilines;
  302.                 int tmp1, tmp2;
  303.                 /* 8. Estimate Horizontal period. */
  304.                 tmp1 = HV_FACTOR * 1000000 -
  305.                         CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
  306.                 tmp2 = vdisplay_rnd + 2 * vmargin;
  307.                 hperiod = tmp1 / (tmp2 * vfieldrate);
  308.                 /* 9. Find number of lines in vertical blanking */
  309.                 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
  310.                 /* 10. Check if vertical blanking is sufficient */
  311.                 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
  312.                         vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
  313.                 /* 11. Find total number of lines in vertical field */
  314.                 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
  315.                 /* 12. Find total number of pixels in a line */
  316.                 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
  317.                 /* Fill in HSync values */
  318.                 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
  319.                 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
  320.                 /* Fill in VSync values */
  321.                 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
  322.                 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
  323.         }
  324.         /* 15/13. Find pixel clock frequency (kHz for xf86) */
  325.         drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
  326.         drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
  327.         /* 18/16. Find actual vertical frame frequency */
  328.         /* ignore - just set the mode flag for interlaced */
  329.         if (interlaced) {
  330.                 drm_mode->vtotal *= 2;
  331.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  332.         }
  333.         /* Fill the mode line name */
  334.         drm_mode_set_name(drm_mode);
  335.         if (reduced)
  336.                 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
  337.                                         DRM_MODE_FLAG_NVSYNC);
  338.         else
  339.                 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
  340.                                         DRM_MODE_FLAG_NHSYNC);
  341.  
  342.         return drm_mode;
  343. }
  344. EXPORT_SYMBOL(drm_cvt_mode);
  345.  
  346. /**
  347.  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
  348.  * @dev: drm device
  349.  * @hdisplay: hdisplay size
  350.  * @vdisplay: vdisplay size
  351.  * @vrefresh: vrefresh rate.
  352.  * @interlaced: whether to compute an interlaced mode
  353.  * @margins: desired margin (borders) size
  354.  * @GTF_M: extended GTF formula parameters
  355.  * @GTF_2C: extended GTF formula parameters
  356.  * @GTF_K: extended GTF formula parameters
  357.  * @GTF_2J: extended GTF formula parameters
  358.  *
  359.  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
  360.  * in here multiplied by two.  For a C of 40, pass in 80.
  361.  *
  362.  * Returns:
  363.  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
  364.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  365.  * when no mode could be allocated.
  366.  */
  367. struct drm_display_mode *
  368. drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
  369.                      int vrefresh, bool interlaced, int margins,
  370.                      int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
  371. {       /* 1) top/bottom margin size (% of height) - default: 1.8, */
  372. #define GTF_MARGIN_PERCENTAGE           18
  373.         /* 2) character cell horizontal granularity (pixels) - default 8 */
  374. #define GTF_CELL_GRAN                   8
  375.         /* 3) Minimum vertical porch (lines) - default 3 */
  376. #define GTF_MIN_V_PORCH                 1
  377.         /* width of vsync in lines */
  378. #define V_SYNC_RQD                      3
  379.         /* width of hsync as % of total line */
  380. #define H_SYNC_PERCENT                  8
  381.         /* min time of vsync + back porch (microsec) */
  382. #define MIN_VSYNC_PLUS_BP               550
  383.         /* C' and M' are part of the Blanking Duty Cycle computation */
  384. #define GTF_C_PRIME     ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
  385. #define GTF_M_PRIME     (GTF_K * GTF_M / 256)
  386.         struct drm_display_mode *drm_mode;
  387.         unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
  388.         int top_margin, bottom_margin;
  389.         int interlace;
  390.         unsigned int hfreq_est;
  391.         int vsync_plus_bp, vback_porch;
  392.         unsigned int vtotal_lines, vfieldrate_est, hperiod;
  393.         unsigned int vfield_rate, vframe_rate;
  394.         int left_margin, right_margin;
  395.         unsigned int total_active_pixels, ideal_duty_cycle;
  396.         unsigned int hblank, total_pixels, pixel_freq;
  397.         int hsync, hfront_porch, vodd_front_porch_lines;
  398.         unsigned int tmp1, tmp2;
  399.  
  400.         drm_mode = drm_mode_create(dev);
  401.         if (!drm_mode)
  402.                 return NULL;
  403.  
  404.         /* 1. In order to give correct results, the number of horizontal
  405.          * pixels requested is first processed to ensure that it is divisible
  406.          * by the character size, by rounding it to the nearest character
  407.          * cell boundary:
  408.          */
  409.         hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  410.         hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
  411.  
  412.         /* 2. If interlace is requested, the number of vertical lines assumed
  413.          * by the calculation must be halved, as the computation calculates
  414.          * the number of vertical lines per field.
  415.          */
  416.         if (interlaced)
  417.                 vdisplay_rnd = vdisplay / 2;
  418.         else
  419.                 vdisplay_rnd = vdisplay;
  420.  
  421.         /* 3. Find the frame rate required: */
  422.         if (interlaced)
  423.                 vfieldrate_rqd = vrefresh * 2;
  424.         else
  425.                 vfieldrate_rqd = vrefresh;
  426.  
  427.         /* 4. Find number of lines in Top margin: */
  428.         top_margin = 0;
  429.         if (margins)
  430.                 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  431.                                 1000;
  432.         /* 5. Find number of lines in bottom margin: */
  433.         bottom_margin = top_margin;
  434.  
  435.         /* 6. If interlace is required, then set variable interlace: */
  436.         if (interlaced)
  437.                 interlace = 1;
  438.         else
  439.                 interlace = 0;
  440.  
  441.         /* 7. Estimate the Horizontal frequency */
  442.         {
  443.                 tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
  444.                 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
  445.                                 2 + interlace;
  446.                 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
  447.         }
  448.  
  449.         /* 8. Find the number of lines in V sync + back porch */
  450.         /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
  451.         vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
  452.         vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
  453.         /*  9. Find the number of lines in V back porch alone: */
  454.         vback_porch = vsync_plus_bp - V_SYNC_RQD;
  455.         /*  10. Find the total number of lines in Vertical field period: */
  456.         vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
  457.                         vsync_plus_bp + GTF_MIN_V_PORCH;
  458.         /*  11. Estimate the Vertical field frequency: */
  459.         vfieldrate_est = hfreq_est / vtotal_lines;
  460.         /*  12. Find the actual horizontal period: */
  461.         hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
  462.  
  463.         /*  13. Find the actual Vertical field frequency: */
  464.         vfield_rate = hfreq_est / vtotal_lines;
  465.         /*  14. Find the Vertical frame frequency: */
  466.         if (interlaced)
  467.                 vframe_rate = vfield_rate / 2;
  468.         else
  469.                 vframe_rate = vfield_rate;
  470.         /*  15. Find number of pixels in left margin: */
  471.         if (margins)
  472.                 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
  473.                                 1000;
  474.         else
  475.                 left_margin = 0;
  476.  
  477.         /* 16.Find number of pixels in right margin: */
  478.         right_margin = left_margin;
  479.         /* 17.Find total number of active pixels in image and left and right */
  480.         total_active_pixels = hdisplay_rnd + left_margin + right_margin;
  481.         /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
  482.         ideal_duty_cycle = GTF_C_PRIME * 1000 -
  483.                                 (GTF_M_PRIME * 1000000 / hfreq_est);
  484.         /* 19.Find the number of pixels in the blanking time to the nearest
  485.          * double character cell: */
  486.         hblank = total_active_pixels * ideal_duty_cycle /
  487.                         (100000 - ideal_duty_cycle);
  488.         hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
  489.         hblank = hblank * 2 * GTF_CELL_GRAN;
  490.         /* 20.Find total number of pixels: */
  491.         total_pixels = total_active_pixels + hblank;
  492.         /* 21.Find pixel clock frequency: */
  493.         pixel_freq = total_pixels * hfreq_est / 1000;
  494.         /* Stage 1 computations are now complete; I should really pass
  495.          * the results to another function and do the Stage 2 computations,
  496.          * but I only need a few more values so I'll just append the
  497.          * computations here for now */
  498.         /* 17. Find the number of pixels in the horizontal sync period: */
  499.         hsync = H_SYNC_PERCENT * total_pixels / 100;
  500.         hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
  501.         hsync = hsync * GTF_CELL_GRAN;
  502.         /* 18. Find the number of pixels in horizontal front porch period */
  503.         hfront_porch = hblank / 2 - hsync;
  504.         /*  36. Find the number of lines in the odd front porch period: */
  505.         vodd_front_porch_lines = GTF_MIN_V_PORCH ;
  506.  
  507.         /* finally, pack the results in the mode struct */
  508.         drm_mode->hdisplay = hdisplay_rnd;
  509.         drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
  510.         drm_mode->hsync_end = drm_mode->hsync_start + hsync;
  511.         drm_mode->htotal = total_pixels;
  512.         drm_mode->vdisplay = vdisplay_rnd;
  513.         drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
  514.         drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
  515.         drm_mode->vtotal = vtotal_lines;
  516.  
  517.         drm_mode->clock = pixel_freq;
  518.  
  519.         if (interlaced) {
  520.                 drm_mode->vtotal *= 2;
  521.                 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
  522.         }
  523.  
  524.         drm_mode_set_name(drm_mode);
  525.         if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
  526.                 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
  527.         else
  528.                 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
  529.  
  530.         return drm_mode;
  531. }
  532. EXPORT_SYMBOL(drm_gtf_mode_complex);
  533.  
  534. /**
  535.  * drm_gtf_mode - create the modeline based on the GTF algorithm
  536.  * @dev: drm device
  537.  * @hdisplay: hdisplay size
  538.  * @vdisplay: vdisplay size
  539.  * @vrefresh: vrefresh rate.
  540.  * @interlaced: whether to compute an interlaced mode
  541.  * @margins: desired margin (borders) size
  542.  *
  543.  * return the modeline based on GTF algorithm
  544.  *
  545.  * This function is to create the modeline based on the GTF algorithm.
  546.  * Generalized Timing Formula is derived from:
  547.  *      GTF Spreadsheet by Andy Morrish (1/5/97)
  548.  *      available at http://www.vesa.org
  549.  *
  550.  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
  551.  * What I have done is to translate it by using integer calculation.
  552.  * I also refer to the function of fb_get_mode in the file of
  553.  * drivers/video/fbmon.c
  554.  *
  555.  * Standard GTF parameters:
  556.  * M = 600
  557.  * C = 40
  558.  * K = 128
  559.  * J = 20
  560.  *
  561.  * Returns:
  562.  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
  563.  * The display mode object is allocated with drm_mode_create(). Returns NULL
  564.  * when no mode could be allocated.
  565.  */
  566. struct drm_display_mode *
  567. drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
  568.              bool interlaced, int margins)
  569. {
  570.         return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
  571.                                     interlaced, margins,
  572.                                     600, 40 * 2, 128, 20 * 2);
  573. }
  574. EXPORT_SYMBOL(drm_gtf_mode);
  575.  
  576. #ifdef CONFIG_VIDEOMODE_HELPERS
  577. /**
  578.  * drm_display_mode_from_videomode - fill in @dmode using @vm,
  579.  * @vm: videomode structure to use as source
  580.  * @dmode: drm_display_mode structure to use as destination
  581.  *
  582.  * Fills out @dmode using the display mode specified in @vm.
  583.  */
  584. void drm_display_mode_from_videomode(const struct videomode *vm,
  585.                                      struct drm_display_mode *dmode)
  586. {
  587.         dmode->hdisplay = vm->hactive;
  588.         dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
  589.         dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
  590.         dmode->htotal = dmode->hsync_end + vm->hback_porch;
  591.  
  592.         dmode->vdisplay = vm->vactive;
  593.         dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
  594.         dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
  595.         dmode->vtotal = dmode->vsync_end + vm->vback_porch;
  596.  
  597.         dmode->clock = vm->pixelclock / 1000;
  598.  
  599.         dmode->flags = 0;
  600.         if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
  601.                 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
  602.         else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
  603.                 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
  604.         if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
  605.                 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
  606.         else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
  607.                 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
  608.         if (vm->flags & DISPLAY_FLAGS_INTERLACED)
  609.                 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
  610.         if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
  611.                 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
  612.         if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
  613.                 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
  614.         drm_mode_set_name(dmode);
  615. }
  616. EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
  617.  
  618. /**
  619.  * drm_display_mode_to_videomode - fill in @vm using @dmode,
  620.  * @dmode: drm_display_mode structure to use as source
  621.  * @vm: videomode structure to use as destination
  622.  *
  623.  * Fills out @vm using the display mode specified in @dmode.
  624.  */
  625. void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
  626.                                    struct videomode *vm)
  627. {
  628.         vm->hactive = dmode->hdisplay;
  629.         vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
  630.         vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
  631.         vm->hback_porch = dmode->htotal - dmode->hsync_end;
  632.  
  633.         vm->vactive = dmode->vdisplay;
  634.         vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
  635.         vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
  636.         vm->vback_porch = dmode->vtotal - dmode->vsync_end;
  637.  
  638.         vm->pixelclock = dmode->clock * 1000;
  639.  
  640.         vm->flags = 0;
  641.         if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
  642.                 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
  643.         else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
  644.                 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
  645.         if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
  646.                 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
  647.         else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
  648.                 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
  649.         if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
  650.                 vm->flags |= DISPLAY_FLAGS_INTERLACED;
  651.         if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
  652.                 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
  653.         if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
  654.                 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
  655. }
  656. EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
  657.  
  658. #ifdef CONFIG_OF
  659. /**
  660.  * of_get_drm_display_mode - get a drm_display_mode from devicetree
  661.  * @np: device_node with the timing specification
  662.  * @dmode: will be set to the return value
  663.  * @index: index into the list of display timings in devicetree
  664.  *
  665.  * This function is expensive and should only be used, if only one mode is to be
  666.  * read from DT. To get multiple modes start with of_get_display_timings and
  667.  * work with that instead.
  668.  *
  669.  * Returns:
  670.  * 0 on success, a negative errno code when no of videomode node was found.
  671.  */
  672. int of_get_drm_display_mode(struct device_node *np,
  673.                             struct drm_display_mode *dmode, int index)
  674. {
  675.         struct videomode vm;
  676.         int ret;
  677.  
  678.         ret = of_get_videomode(np, &vm, index);
  679.         if (ret)
  680.                 return ret;
  681.  
  682.         drm_display_mode_from_videomode(&vm, dmode);
  683.  
  684.         pr_debug("%s: got %dx%d display mode from %s\n",
  685.                 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
  686.         drm_mode_debug_printmodeline(dmode);
  687.  
  688.         return 0;
  689. }
  690. EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
  691. #endif /* CONFIG_OF */
  692. #endif /* CONFIG_VIDEOMODE_HELPERS */
  693.  
  694. /**
  695.  * drm_mode_set_name - set the name on a mode
  696.  * @mode: name will be set in this mode
  697.  *
  698.  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
  699.  * with an optional 'i' suffix for interlaced modes.
  700.  */
  701. void drm_mode_set_name(struct drm_display_mode *mode)
  702. {
  703.         bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
  704.  
  705.         snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
  706.                  mode->hdisplay, mode->vdisplay,
  707.                  interlaced ? "i" : "");
  708. }
  709. EXPORT_SYMBOL(drm_mode_set_name);
  710.  
  711. /**
  712.  * drm_mode_hsync - get the hsync of a mode
  713.  * @mode: mode
  714.  *
  715.  * Returns:
  716.  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
  717.  * value first if it is not yet set.
  718.  */
  719. int drm_mode_hsync(const struct drm_display_mode *mode)
  720. {
  721.         unsigned int calc_val;
  722.  
  723.         if (mode->hsync)
  724.                 return mode->hsync;
  725.  
  726.         if (mode->htotal < 0)
  727.                 return 0;
  728.  
  729.         calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
  730.         calc_val += 500;                                /* round to 1000Hz */
  731.         calc_val /= 1000;                               /* truncate to kHz */
  732.  
  733.         return calc_val;
  734. }
  735. EXPORT_SYMBOL(drm_mode_hsync);
  736.  
  737. /**
  738.  * drm_mode_vrefresh - get the vrefresh of a mode
  739.  * @mode: mode
  740.  *
  741.  * Returns:
  742.  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
  743.  * value first if it is not yet set.
  744.  */
  745. int drm_mode_vrefresh(const struct drm_display_mode *mode)
  746. {
  747.         int refresh = 0;
  748.         unsigned int calc_val;
  749.  
  750.         if (mode->vrefresh > 0)
  751.                 refresh = mode->vrefresh;
  752.         else if (mode->htotal > 0 && mode->vtotal > 0) {
  753.                 int vtotal;
  754.                 vtotal = mode->vtotal;
  755.                 /* work out vrefresh the value will be x1000 */
  756.                 calc_val = (mode->clock * 1000);
  757.                 calc_val /= mode->htotal;
  758.                 refresh = (calc_val + vtotal / 2) / vtotal;
  759.  
  760.                 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  761.                         refresh *= 2;
  762.                 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  763.                         refresh /= 2;
  764.                 if (mode->vscan > 1)
  765.                         refresh /= mode->vscan;
  766.         }
  767.         return refresh;
  768. }
  769. EXPORT_SYMBOL(drm_mode_vrefresh);
  770.  
  771. /**
  772.  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
  773.  * @p: mode
  774.  * @adjust_flags: a combination of adjustment flags
  775.  *
  776.  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
  777.  *
  778.  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
  779.  *   interlaced modes.
  780.  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
  781.  *   buffers containing two eyes (only adjust the timings when needed, eg. for
  782.  *   "frame packing" or "side by side full").
  783.  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
  784.  *   be performed for doublescan and vscan > 1 modes respectively.
  785.  */
  786. void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
  787. {
  788.         if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
  789.                 return;
  790.  
  791.         p->crtc_clock = p->clock;
  792.         p->crtc_hdisplay = p->hdisplay;
  793.         p->crtc_hsync_start = p->hsync_start;
  794.         p->crtc_hsync_end = p->hsync_end;
  795.         p->crtc_htotal = p->htotal;
  796.         p->crtc_hskew = p->hskew;
  797.         p->crtc_vdisplay = p->vdisplay;
  798.         p->crtc_vsync_start = p->vsync_start;
  799.         p->crtc_vsync_end = p->vsync_end;
  800.         p->crtc_vtotal = p->vtotal;
  801.  
  802.         if (p->flags & DRM_MODE_FLAG_INTERLACE) {
  803.                 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
  804.                         p->crtc_vdisplay /= 2;
  805.                         p->crtc_vsync_start /= 2;
  806.                         p->crtc_vsync_end /= 2;
  807.                         p->crtc_vtotal /= 2;
  808.                 }
  809.         }
  810.  
  811.         if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
  812.                 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
  813.                         p->crtc_vdisplay *= 2;
  814.                         p->crtc_vsync_start *= 2;
  815.                         p->crtc_vsync_end *= 2;
  816.                         p->crtc_vtotal *= 2;
  817.                 }
  818.         }
  819.  
  820.         if (!(adjust_flags & CRTC_NO_VSCAN)) {
  821.                 if (p->vscan > 1) {
  822.                         p->crtc_vdisplay *= p->vscan;
  823.                         p->crtc_vsync_start *= p->vscan;
  824.                         p->crtc_vsync_end *= p->vscan;
  825.                         p->crtc_vtotal *= p->vscan;
  826.                 }
  827.         }
  828.  
  829.         if (adjust_flags & CRTC_STEREO_DOUBLE) {
  830.                 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
  831.  
  832.                 switch (layout) {
  833.                 case DRM_MODE_FLAG_3D_FRAME_PACKING:
  834.                         p->crtc_clock *= 2;
  835.                         p->crtc_vdisplay += p->crtc_vtotal;
  836.                         p->crtc_vsync_start += p->crtc_vtotal;
  837.                         p->crtc_vsync_end += p->crtc_vtotal;
  838.                         p->crtc_vtotal += p->crtc_vtotal;
  839.                         break;
  840.                 }
  841.         }
  842.  
  843.         p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
  844.         p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
  845.         p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
  846.         p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
  847. }
  848. EXPORT_SYMBOL(drm_mode_set_crtcinfo);
  849.  
  850. /**
  851.  * drm_mode_copy - copy the mode
  852.  * @dst: mode to overwrite
  853.  * @src: mode to copy
  854.  *
  855.  * Copy an existing mode into another mode, preserving the object id and
  856.  * list head of the destination mode.
  857.  */
  858. void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
  859. {
  860.         int id = dst->base.id;
  861.         struct list_head head = dst->head;
  862.  
  863.         *dst = *src;
  864.         dst->base.id = id;
  865.         dst->head = head;
  866. }
  867. EXPORT_SYMBOL(drm_mode_copy);
  868.  
  869. /**
  870.  * drm_mode_duplicate - allocate and duplicate an existing mode
  871.  * @dev: drm_device to allocate the duplicated mode for
  872.  * @mode: mode to duplicate
  873.  *
  874.  * Just allocate a new mode, copy the existing mode into it, and return
  875.  * a pointer to it.  Used to create new instances of established modes.
  876.  *
  877.  * Returns:
  878.  * Pointer to duplicated mode on success, NULL on error.
  879.  */
  880. struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
  881.                                             const struct drm_display_mode *mode)
  882. {
  883.         struct drm_display_mode *nmode;
  884.  
  885.         nmode = drm_mode_create(dev);
  886.         if (!nmode)
  887.                 return NULL;
  888.  
  889.         drm_mode_copy(nmode, mode);
  890.  
  891.         return nmode;
  892. }
  893. EXPORT_SYMBOL(drm_mode_duplicate);
  894.  
  895. /**
  896.  * drm_mode_equal - test modes for equality
  897.  * @mode1: first mode
  898.  * @mode2: second mode
  899.  *
  900.  * Check to see if @mode1 and @mode2 are equivalent.
  901.  *
  902.  * Returns:
  903.  * True if the modes are equal, false otherwise.
  904.  */
  905. bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
  906. {
  907.         if (!mode1 && !mode2)
  908.                 return true;
  909.  
  910.         if (!mode1 || !mode2)
  911.                 return false;
  912.  
  913.         /* do clock check convert to PICOS so fb modes get matched
  914.          * the same */
  915.         if (mode1->clock && mode2->clock) {
  916.                 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
  917.                         return false;
  918.         } else if (mode1->clock != mode2->clock)
  919.                 return false;
  920.  
  921.         return drm_mode_equal_no_clocks(mode1, mode2);
  922. }
  923. EXPORT_SYMBOL(drm_mode_equal);
  924.  
  925. /**
  926.  * drm_mode_equal_no_clocks - test modes for equality
  927.  * @mode1: first mode
  928.  * @mode2: second mode
  929.  *
  930.  * Check to see if @mode1 and @mode2 are equivalent, but
  931.  * don't check the pixel clocks.
  932.  *
  933.  * Returns:
  934.  * True if the modes are equal, false otherwise.
  935.  */
  936. bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
  937. {
  938.         if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
  939.             (mode2->flags & DRM_MODE_FLAG_3D_MASK))
  940.                 return false;
  941.  
  942.         return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
  943. }
  944. EXPORT_SYMBOL(drm_mode_equal_no_clocks);
  945.  
  946. /**
  947.  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
  948.  * @mode1: first mode
  949.  * @mode2: second mode
  950.  *
  951.  * Check to see if @mode1 and @mode2 are equivalent, but
  952.  * don't check the pixel clocks nor the stereo layout.
  953.  *
  954.  * Returns:
  955.  * True if the modes are equal, false otherwise.
  956.  */
  957. bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
  958.                                         const struct drm_display_mode *mode2)
  959. {
  960.         if (mode1->hdisplay == mode2->hdisplay &&
  961.             mode1->hsync_start == mode2->hsync_start &&
  962.             mode1->hsync_end == mode2->hsync_end &&
  963.             mode1->htotal == mode2->htotal &&
  964.             mode1->hskew == mode2->hskew &&
  965.             mode1->vdisplay == mode2->vdisplay &&
  966.             mode1->vsync_start == mode2->vsync_start &&
  967.             mode1->vsync_end == mode2->vsync_end &&
  968.             mode1->vtotal == mode2->vtotal &&
  969.             mode1->vscan == mode2->vscan &&
  970.             (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
  971.              (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
  972.                 return true;
  973.  
  974.         return false;
  975. }
  976. EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
  977.  
  978. /**
  979.  * drm_mode_validate_basic - make sure the mode is somewhat sane
  980.  * @mode: mode to check
  981.  *
  982.  * Check that the mode timings are at least somewhat reasonable.
  983.  * Any hardware specific limits are left up for each driver to check.
  984.  *
  985.  * Returns:
  986.  * The mode status
  987.  */
  988. enum drm_mode_status
  989. drm_mode_validate_basic(const struct drm_display_mode *mode)
  990. {
  991.         if (mode->clock == 0)
  992.                 return MODE_CLOCK_LOW;
  993.  
  994.         if (mode->hdisplay == 0 ||
  995.             mode->hsync_start < mode->hdisplay ||
  996.             mode->hsync_end < mode->hsync_start ||
  997.             mode->htotal < mode->hsync_end)
  998.                 return MODE_H_ILLEGAL;
  999.  
  1000.         if (mode->vdisplay == 0 ||
  1001.             mode->vsync_start < mode->vdisplay ||
  1002.             mode->vsync_end < mode->vsync_start ||
  1003.             mode->vtotal < mode->vsync_end)
  1004.                 return MODE_V_ILLEGAL;
  1005.  
  1006.         return MODE_OK;
  1007. }
  1008. EXPORT_SYMBOL(drm_mode_validate_basic);
  1009.  
  1010. /**
  1011.  * drm_mode_validate_size - make sure modes adhere to size constraints
  1012.  * @mode: mode to check
  1013.  * @maxX: maximum width
  1014.  * @maxY: maximum height
  1015.  *
  1016.  * This function is a helper which can be used to validate modes against size
  1017.  * limitations of the DRM device/connector. If a mode is too big its status
  1018.  * member is updated with the appropriate validation failure code. The list
  1019.  * itself is not changed.
  1020.  *
  1021.  * Returns:
  1022.  * The mode status
  1023.  */
  1024. enum drm_mode_status
  1025. drm_mode_validate_size(const struct drm_display_mode *mode,
  1026.                        int maxX, int maxY)
  1027. {
  1028.         if (maxX > 0 && mode->hdisplay > maxX)
  1029.                 return MODE_VIRTUAL_X;
  1030.  
  1031.         if (maxY > 0 && mode->vdisplay > maxY)
  1032.                 return MODE_VIRTUAL_Y;
  1033.  
  1034.         return MODE_OK;
  1035. }
  1036. EXPORT_SYMBOL(drm_mode_validate_size);
  1037.  
  1038. #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
  1039.  
  1040. static const char * const drm_mode_status_names[] = {
  1041.         MODE_STATUS(OK),
  1042.         MODE_STATUS(HSYNC),
  1043.         MODE_STATUS(VSYNC),
  1044.         MODE_STATUS(H_ILLEGAL),
  1045.         MODE_STATUS(V_ILLEGAL),
  1046.         MODE_STATUS(BAD_WIDTH),
  1047.         MODE_STATUS(NOMODE),
  1048.         MODE_STATUS(NO_INTERLACE),
  1049.         MODE_STATUS(NO_DBLESCAN),
  1050.         MODE_STATUS(NO_VSCAN),
  1051.         MODE_STATUS(MEM),
  1052.         MODE_STATUS(VIRTUAL_X),
  1053.         MODE_STATUS(VIRTUAL_Y),
  1054.         MODE_STATUS(MEM_VIRT),
  1055.         MODE_STATUS(NOCLOCK),
  1056.         MODE_STATUS(CLOCK_HIGH),
  1057.         MODE_STATUS(CLOCK_LOW),
  1058.         MODE_STATUS(CLOCK_RANGE),
  1059.         MODE_STATUS(BAD_HVALUE),
  1060.         MODE_STATUS(BAD_VVALUE),
  1061.         MODE_STATUS(BAD_VSCAN),
  1062.         MODE_STATUS(HSYNC_NARROW),
  1063.         MODE_STATUS(HSYNC_WIDE),
  1064.         MODE_STATUS(HBLANK_NARROW),
  1065.         MODE_STATUS(HBLANK_WIDE),
  1066.         MODE_STATUS(VSYNC_NARROW),
  1067.         MODE_STATUS(VSYNC_WIDE),
  1068.         MODE_STATUS(VBLANK_NARROW),
  1069.         MODE_STATUS(VBLANK_WIDE),
  1070.         MODE_STATUS(PANEL),
  1071.         MODE_STATUS(INTERLACE_WIDTH),
  1072.         MODE_STATUS(ONE_WIDTH),
  1073.         MODE_STATUS(ONE_HEIGHT),
  1074.         MODE_STATUS(ONE_SIZE),
  1075.         MODE_STATUS(NO_REDUCED),
  1076.         MODE_STATUS(NO_STEREO),
  1077.         MODE_STATUS(STALE),
  1078.         MODE_STATUS(BAD),
  1079.         MODE_STATUS(ERROR),
  1080. };
  1081.  
  1082. #undef MODE_STATUS
  1083.  
  1084. static const char *drm_get_mode_status_name(enum drm_mode_status status)
  1085. {
  1086.         int index = status + 3;
  1087.  
  1088.         if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
  1089.                 return "";
  1090.  
  1091.         return drm_mode_status_names[index];
  1092. }
  1093.  
  1094. /**
  1095.  * drm_mode_prune_invalid - remove invalid modes from mode list
  1096.  * @dev: DRM device
  1097.  * @mode_list: list of modes to check
  1098.  * @verbose: be verbose about it
  1099.  *
  1100.  * This helper function can be used to prune a display mode list after
  1101.  * validation has been completed. All modes who's status is not MODE_OK will be
  1102.  * removed from the list, and if @verbose the status code and mode name is also
  1103.  * printed to dmesg.
  1104.  */
  1105. void drm_mode_prune_invalid(struct drm_device *dev,
  1106.                             struct list_head *mode_list, bool verbose)
  1107. {
  1108.         struct drm_display_mode *mode, *t;
  1109.  
  1110.         list_for_each_entry_safe(mode, t, mode_list, head) {
  1111.                 if (mode->status != MODE_OK) {
  1112.                         list_del(&mode->head);
  1113.                         if (verbose) {
  1114.                                 drm_mode_debug_printmodeline(mode);
  1115.                                 DRM_DEBUG_KMS("Not using %s mode: %s\n",
  1116.                                               mode->name,
  1117.                                               drm_get_mode_status_name(mode->status));
  1118.                         }
  1119.                         drm_mode_destroy(dev, mode);
  1120.                 }
  1121.         }
  1122. }
  1123. EXPORT_SYMBOL(drm_mode_prune_invalid);
  1124.  
  1125. /**
  1126.  * drm_mode_compare - compare modes for favorability
  1127.  * @priv: unused
  1128.  * @lh_a: list_head for first mode
  1129.  * @lh_b: list_head for second mode
  1130.  *
  1131.  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
  1132.  * which is better.
  1133.  *
  1134.  * Returns:
  1135.  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
  1136.  * positive if @lh_b is better than @lh_a.
  1137.  */
  1138. static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
  1139. {
  1140.         struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
  1141.         struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
  1142.         int diff;
  1143.  
  1144.         diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
  1145.                 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
  1146.         if (diff)
  1147.                 return diff;
  1148.         diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
  1149.         if (diff)
  1150.                 return diff;
  1151.  
  1152.         diff = b->vrefresh - a->vrefresh;
  1153.         if (diff)
  1154.                 return diff;
  1155.  
  1156.         diff = b->clock - a->clock;
  1157.         return diff;
  1158. }
  1159.  
  1160. /**
  1161.  * drm_mode_sort - sort mode list
  1162.  * @mode_list: list of drm_display_mode structures to sort
  1163.  *
  1164.  * Sort @mode_list by favorability, moving good modes to the head of the list.
  1165.  */
  1166. void drm_mode_sort(struct list_head *mode_list)
  1167. {
  1168.         list_sort(NULL, mode_list, drm_mode_compare);
  1169. }
  1170. EXPORT_SYMBOL(drm_mode_sort);
  1171.  
  1172. /**
  1173.  * drm_mode_connector_list_update - update the mode list for the connector
  1174.  * @connector: the connector to update
  1175.  *
  1176.  * This moves the modes from the @connector probed_modes list
  1177.  * to the actual mode list. It compares the probed mode against the current
  1178.  * list and only adds different/new modes.
  1179.  *
  1180.  * This is just a helper functions doesn't validate any modes itself and also
  1181.  * doesn't prune any invalid modes. Callers need to do that themselves.
  1182.  */
  1183. void drm_mode_connector_list_update(struct drm_connector *connector)
  1184. {
  1185.         struct drm_display_mode *pmode, *pt;
  1186.  
  1187.         WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
  1188.  
  1189.         list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
  1190.                 struct drm_display_mode *mode;
  1191.                 bool found_it = false;
  1192.  
  1193.                 /* go through current modes checking for the new probed mode */
  1194.                 list_for_each_entry(mode, &connector->modes, head) {
  1195.                         if (!drm_mode_equal(pmode, mode))
  1196.                                 continue;
  1197.  
  1198.                         found_it = true;
  1199.  
  1200.                         /*
  1201.                          * If the old matching mode is stale (ie. left over
  1202.                          * from a previous probe) just replace it outright.
  1203.                          * Otherwise just merge the type bits between all
  1204.                          * equal probed modes.
  1205.                          *
  1206.                          * If two probed modes are considered equal, pick the
  1207.                          * actual timings from the one that's marked as
  1208.                          * preferred (in case the match isn't 100%). If
  1209.                          * multiple or zero preferred modes are present, favor
  1210.                          * the mode added to the probed_modes list first.
  1211.                          */
  1212.                         if (mode->status == MODE_STALE) {
  1213.                                 drm_mode_copy(mode, pmode);
  1214.                         } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
  1215.                                    (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
  1216.                                 pmode->type |= mode->type;
  1217.                                 drm_mode_copy(mode, pmode);
  1218.                         } else {
  1219.                                         mode->type |= pmode->type;
  1220.                         }
  1221.  
  1222.                                 list_del(&pmode->head);
  1223.                                 drm_mode_destroy(connector->dev, pmode);
  1224.                                 break;
  1225.                         }
  1226.  
  1227.                 if (!found_it) {
  1228.                         list_move_tail(&pmode->head, &connector->modes);
  1229.                 }
  1230.         }
  1231. }
  1232. EXPORT_SYMBOL(drm_mode_connector_list_update);
  1233.  
  1234. /**
  1235.  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
  1236.  * @mode_option: optional per connector mode option
  1237.  * @connector: connector to parse modeline for
  1238.  * @mode: preallocated drm_cmdline_mode structure to fill out
  1239.  *
  1240.  * This parses @mode_option command line modeline for modes and options to
  1241.  * configure the connector. If @mode_option is NULL the default command line
  1242.  * modeline in fb_mode_option will be parsed instead.
  1243.  *
  1244.  * This uses the same parameters as the fb modedb.c, except for an extra
  1245.  * force-enable, force-enable-digital and force-disable bit at the end:
  1246.  *
  1247.  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  1248.  *
  1249.  * The intermediate drm_cmdline_mode structure is required to store additional
  1250.  * options from the command line modline like the force-enable/disable flag.
  1251.  *
  1252.  * Returns:
  1253.  * True if a valid modeline has been parsed, false otherwise.
  1254.  */
  1255. bool drm_mode_parse_command_line_for_connector(const char *mode_option,
  1256.                                                struct drm_connector *connector,
  1257.                                                struct drm_cmdline_mode *mode)
  1258. {
  1259.         const char *name;
  1260.         unsigned int namelen;
  1261.         bool res_specified = false, bpp_specified = false, refresh_specified = false;
  1262.         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  1263.         bool yres_specified = false, cvt = false, rb = false;
  1264.         bool interlace = false, margins = false, was_digit = false;
  1265.         int i;
  1266.         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  1267.  
  1268. #ifdef CONFIG_FB
  1269.         if (!mode_option)
  1270.                 mode_option = fb_mode_option;
  1271. #endif
  1272.  
  1273.         if (!mode_option) {
  1274.                 mode->specified = false;
  1275.                 return false;
  1276.         }
  1277.  
  1278.         name = mode_option;
  1279.         namelen = strlen(name);
  1280.         for (i = namelen-1; i >= 0; i--) {
  1281.                 switch (name[i]) {
  1282.                 case '@':
  1283.                         if (!refresh_specified && !bpp_specified &&
  1284.                             !yres_specified && !cvt && !rb && was_digit) {
  1285.                                 refresh = simple_strtol(&name[i+1], NULL, 10);
  1286.                                 refresh_specified = true;
  1287.                                 was_digit = false;
  1288.                         } else
  1289.                                 goto done;
  1290.                         break;
  1291.                 case '-':
  1292.                         if (!bpp_specified && !yres_specified && !cvt &&
  1293.                             !rb && was_digit) {
  1294.                                 bpp = simple_strtol(&name[i+1], NULL, 10);
  1295.                                 bpp_specified = true;
  1296.                                 was_digit = false;
  1297.                         } else
  1298.                                 goto done;
  1299.                         break;
  1300.                 case 'x':
  1301.                         if (!yres_specified && was_digit) {
  1302.                                 yres = simple_strtol(&name[i+1], NULL, 10);
  1303.                                 yres_specified = true;
  1304.                                 was_digit = false;
  1305.                         } else
  1306.                                 goto done;
  1307.                         break;
  1308.                 case '0' ... '9':
  1309.                         was_digit = true;
  1310.                         break;
  1311.                 case 'M':
  1312.                         if (yres_specified || cvt || was_digit)
  1313.                                 goto done;
  1314.                         cvt = true;
  1315.                         break;
  1316.                 case 'R':
  1317.                         if (yres_specified || cvt || rb || was_digit)
  1318.                                 goto done;
  1319.                         rb = true;
  1320.                         break;
  1321.                 case 'm':
  1322.                         if (cvt || yres_specified || was_digit)
  1323.                                 goto done;
  1324.                         margins = true;
  1325.                         break;
  1326.                 case 'i':
  1327.                         if (cvt || yres_specified || was_digit)
  1328.                                 goto done;
  1329.                         interlace = true;
  1330.                         break;
  1331.                 case 'e':
  1332.                         if (yres_specified || bpp_specified || refresh_specified ||
  1333.                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
  1334.                                 goto done;
  1335.  
  1336.                         force = DRM_FORCE_ON;
  1337.                         break;
  1338.                 case 'D':
  1339.                         if (yres_specified || bpp_specified || refresh_specified ||
  1340.                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
  1341.                                 goto done;
  1342.  
  1343.                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
  1344.                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
  1345.                                 force = DRM_FORCE_ON;
  1346.                         else
  1347.                                 force = DRM_FORCE_ON_DIGITAL;
  1348.                         break;
  1349.                 case 'd':
  1350.                         if (yres_specified || bpp_specified || refresh_specified ||
  1351.                             was_digit || (force != DRM_FORCE_UNSPECIFIED))
  1352.                                 goto done;
  1353.  
  1354.                         force = DRM_FORCE_OFF;
  1355.                         break;
  1356.                 default:
  1357.                         goto done;
  1358.                 }
  1359.         }
  1360.  
  1361.         if (i < 0 && yres_specified) {
  1362.                 char *ch;
  1363.                 xres = simple_strtol(name, &ch, 10);
  1364.                 if ((ch != NULL) && (*ch == 'x'))
  1365.                         res_specified = true;
  1366.                 else
  1367.                         i = ch - name;
  1368.         } else if (!yres_specified && was_digit) {
  1369.                 /* catch mode that begins with digits but has no 'x' */
  1370.                 i = 0;
  1371.         }
  1372. done:
  1373.         if (i >= 0) {
  1374.                 printk(KERN_WARNING
  1375.                         "parse error at position %i in video mode '%s'\n",
  1376.                         i, name);
  1377.                 mode->specified = false;
  1378.                 return false;
  1379.         }
  1380.  
  1381.         if (res_specified) {
  1382.                 mode->specified = true;
  1383.                 mode->xres = xres;
  1384.                 mode->yres = yres;
  1385.         }
  1386.  
  1387.         if (refresh_specified) {
  1388.                 mode->refresh_specified = true;
  1389.                 mode->refresh = refresh;
  1390.         }
  1391.  
  1392.         if (bpp_specified) {
  1393.                 mode->bpp_specified = true;
  1394.                 mode->bpp = bpp;
  1395.         }
  1396.         mode->rb = rb;
  1397.         mode->cvt = cvt;
  1398.         mode->interlace = interlace;
  1399.         mode->margins = margins;
  1400.         mode->force = force;
  1401.  
  1402.         return true;
  1403. }
  1404. EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
  1405.  
  1406. /**
  1407.  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
  1408.  * @dev: DRM device to create the new mode for
  1409.  * @cmd: input command line modeline
  1410.  *
  1411.  * Returns:
  1412.  * Pointer to converted mode on success, NULL on error.
  1413.  */
  1414. struct drm_display_mode *
  1415. drm_mode_create_from_cmdline_mode(struct drm_device *dev,
  1416.                                   struct drm_cmdline_mode *cmd)
  1417. {
  1418.         struct drm_display_mode *mode;
  1419.  
  1420.         if (cmd->cvt)
  1421.                 mode = drm_cvt_mode(dev,
  1422.                                     cmd->xres, cmd->yres,
  1423.                                     cmd->refresh_specified ? cmd->refresh : 60,
  1424.                                     cmd->rb, cmd->interlace,
  1425.                                     cmd->margins);
  1426.         else
  1427.                 mode = drm_gtf_mode(dev,
  1428.                                     cmd->xres, cmd->yres,
  1429.                                     cmd->refresh_specified ? cmd->refresh : 60,
  1430.                                     cmd->interlace,
  1431.                                     cmd->margins);
  1432.         if (!mode)
  1433.                 return NULL;
  1434.  
  1435.         mode->type |= DRM_MODE_TYPE_USERDEF;
  1436.         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
  1437.         return mode;
  1438. }
  1439. EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
  1440.  
  1441. /**
  1442.  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
  1443.  * @out: drm_mode_modeinfo struct to return to the user
  1444.  * @in: drm_display_mode to use
  1445.  *
  1446.  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
  1447.  * the user.
  1448.  */
  1449. void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
  1450.                                const struct drm_display_mode *in)
  1451. {
  1452.         WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
  1453.              in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
  1454.              in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
  1455.              in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
  1456.              in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
  1457.              "timing values too large for mode info\n");
  1458.  
  1459.         out->clock = in->clock;
  1460.         out->hdisplay = in->hdisplay;
  1461.         out->hsync_start = in->hsync_start;
  1462.         out->hsync_end = in->hsync_end;
  1463.         out->htotal = in->htotal;
  1464.         out->hskew = in->hskew;
  1465.         out->vdisplay = in->vdisplay;
  1466.         out->vsync_start = in->vsync_start;
  1467.         out->vsync_end = in->vsync_end;
  1468.         out->vtotal = in->vtotal;
  1469.         out->vscan = in->vscan;
  1470.         out->vrefresh = in->vrefresh;
  1471.         out->flags = in->flags;
  1472.         out->type = in->type;
  1473.         strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
  1474.         out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
  1475. }
  1476.  
  1477. /**
  1478.  * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
  1479.  * @out: drm_display_mode to return to the user
  1480.  * @in: drm_mode_modeinfo to use
  1481.  *
  1482.  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
  1483.  * the caller.
  1484.  *
  1485.  * Returns:
  1486.  * Zero on success, negative errno on failure.
  1487.  */
  1488. int drm_mode_convert_umode(struct drm_display_mode *out,
  1489.                            const struct drm_mode_modeinfo *in)
  1490. {
  1491.         int ret = -EINVAL;
  1492.  
  1493.         if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
  1494.                 ret = -ERANGE;
  1495.                 goto out;
  1496.         }
  1497.  
  1498.         if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
  1499.                 goto out;
  1500.  
  1501.         out->clock = in->clock;
  1502.         out->hdisplay = in->hdisplay;
  1503.         out->hsync_start = in->hsync_start;
  1504.         out->hsync_end = in->hsync_end;
  1505.         out->htotal = in->htotal;
  1506.         out->hskew = in->hskew;
  1507.         out->vdisplay = in->vdisplay;
  1508.         out->vsync_start = in->vsync_start;
  1509.         out->vsync_end = in->vsync_end;
  1510.         out->vtotal = in->vtotal;
  1511.         out->vscan = in->vscan;
  1512.         out->vrefresh = in->vrefresh;
  1513.         out->flags = in->flags;
  1514.         out->type = in->type;
  1515.         strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
  1516.         out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
  1517.  
  1518.         out->status = drm_mode_validate_basic(out);
  1519.         if (out->status != MODE_OK)
  1520.                 goto out;
  1521.  
  1522.         ret = 0;
  1523.  
  1524. out:
  1525.         return ret;
  1526. }
  1527.