Subversion Repositories Kolibri OS

Rev

Rev 1123 | Rev 1179 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (c) 2006 Luc Verhaegen (quirks list)
  3.  * Copyright (c) 2007-2008 Intel Corporation
  4.  *   Jesse Barnes <jesse.barnes@intel.com>
  5.  *
  6.  * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
  7.  * FB layer.
  8.  *   Copyright (C) 2006 Dennis Munsie <dmunsie@cecropia.com>
  9.  *
  10.  * Permission is hereby granted, free of charge, to any person obtaining a
  11.  * copy of this software and associated documentation files (the "Software"),
  12.  * to deal in the Software without restriction, including without limitation
  13.  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  14.  * and/or sell copies of the Software, and to permit persons to whom the
  15.  * Software is furnished to do so, subject to the following conditions:
  16.  *
  17.  * The above copyright notice and this permission notice (including the
  18.  * next paragraph) shall be included in all copies or substantial portions
  19.  * of the Software.
  20.  *
  21.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  24.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  27.  * DEALINGS IN THE SOFTWARE.
  28.  */
  29. //#include <linux/kernel.h>
  30. #include <types.h>
  31. #include <list.h>
  32.  
  33. #include <linux/idr.h>
  34. #include <linux/i2c.h>
  35. #include <linux/i2c-algo-bit.h>
  36. #include "drmP.h"
  37. #include "drm_edid.h"
  38.  
  39.  
  40.  
  41.  
  42. /*
  43.  * TODO:
  44.  *   - support EDID 1.4 (incl. CE blocks)
  45.  */
  46.  
  47. /*
  48.  * EDID blocks out in the wild have a variety of bugs, try to collect
  49.  * them here (note that userspace may work around broken monitors first,
  50.  * but fixes should make their way here so that the kernel "just works"
  51.  * on as many displays as possible).
  52.  */
  53.  
  54. /* First detailed mode wrong, use largest 60Hz mode */
  55. #define EDID_QUIRK_PREFER_LARGE_60              (1 << 0)
  56. /* Reported 135MHz pixel clock is too high, needs adjustment */
  57. #define EDID_QUIRK_135_CLOCK_TOO_HIGH           (1 << 1)
  58. /* Prefer the largest mode at 75 Hz */
  59. #define EDID_QUIRK_PREFER_LARGE_75              (1 << 2)
  60. /* Detail timing is in cm not mm */
  61. #define EDID_QUIRK_DETAILED_IN_CM               (1 << 3)
  62. /* Detailed timing descriptors have bogus size values, so just take the
  63.  * maximum size and use that.
  64.  */
  65. #define EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE    (1 << 4)
  66. /* Monitor forgot to set the first detailed is preferred bit. */
  67. #define EDID_QUIRK_FIRST_DETAILED_PREFERRED     (1 << 5)
  68. /* use +hsync +vsync for detailed mode */
  69. #define EDID_QUIRK_DETAILED_SYNC_PP             (1 << 6)
  70.  
  71. static struct edid_quirk {
  72.         char *vendor;
  73.         int product_id;
  74.         u32 quirks;
  75. } edid_quirk_list[] = {
  76.         /* Acer AL1706 */
  77.         { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
  78.         /* Acer F51 */
  79.         { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
  80.         /* Unknown Acer */
  81.         { "ACR", 2423, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  82.  
  83.         /* Belinea 10 15 55 */
  84.         { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
  85.         { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
  86.  
  87.         /* Envision Peripherals, Inc. EN-7100e */
  88.         { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
  89.  
  90.         /* Funai Electronics PM36B */
  91.         { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
  92.           EDID_QUIRK_DETAILED_IN_CM },
  93.  
  94.         /* LG Philips LCD LP154W01-A5 */
  95.         { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
  96.         { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
  97.  
  98.         /* Philips 107p5 CRT */
  99.         { "PHL", 57364, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  100.  
  101.         /* Proview AY765C */
  102.         { "PTS", 765, EDID_QUIRK_FIRST_DETAILED_PREFERRED },
  103.  
  104.         /* Samsung SyncMaster 205BW.  Note: irony */
  105.         { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
  106.         /* Samsung SyncMaster 22[5-6]BW */
  107.         { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
  108.         { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
  109. };
  110.  
  111.  
  112. /* Valid EDID header has these bytes */
  113. static u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
  114.  
  115. /**
  116.  * edid_is_valid - sanity check EDID data
  117.  * @edid: EDID data
  118.  *
  119.  * Sanity check the EDID block by looking at the header, the version number
  120.  * and the checksum.  Return 0 if the EDID doesn't check out, or 1 if it's
  121.  * valid.
  122.  */
  123. static bool edid_is_valid(struct edid *edid)
  124. {
  125.         int i;
  126.         u8 csum = 0;
  127.         u8 *raw_edid = (u8 *)edid;
  128.  
  129.         if (memcmp(edid->header, edid_header, sizeof(edid_header)))
  130.                 goto bad;
  131.         if (edid->version != 1) {
  132.                 DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
  133.                 goto bad;
  134.         }
  135.         if (edid->revision > 4)
  136.                 DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
  137.  
  138.         for (i = 0; i < EDID_LENGTH; i++)
  139.                 csum += raw_edid[i];
  140.         if (csum) {
  141.                 DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
  142.                 goto bad;
  143.         }
  144.  
  145.         return 1;
  146.  
  147. bad:
  148.         if (raw_edid) {
  149.                 DRM_ERROR("Raw EDID:\n");
  150. //       print_hex_dump_bytes(KERN_ERR, DUMP_PREFIX_NONE, raw_edid, EDID_LENGTH);
  151. //       printk("\n");
  152.         }
  153.         return 0;
  154. }
  155.  
  156. /**
  157.  * edid_vendor - match a string against EDID's obfuscated vendor field
  158.  * @edid: EDID to match
  159.  * @vendor: vendor string
  160.  *
  161.  * Returns true if @vendor is in @edid, false otherwise
  162.  */
  163. static bool edid_vendor(struct edid *edid, char *vendor)
  164. {
  165.         char edid_vendor[3];
  166.  
  167.         edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
  168.         edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
  169.                           ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
  170.         edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
  171.  
  172.         return !strncmp(edid_vendor, vendor, 3);
  173. }
  174.  
  175. /**
  176.  * edid_get_quirks - return quirk flags for a given EDID
  177.  * @edid: EDID to process
  178.  *
  179.  * This tells subsequent routines what fixes they need to apply.
  180.  */
  181. static u32 edid_get_quirks(struct edid *edid)
  182. {
  183.         struct edid_quirk *quirk;
  184.         int i;
  185.  
  186.         for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
  187.                 quirk = &edid_quirk_list[i];
  188.  
  189.                 if (edid_vendor(edid, quirk->vendor) &&
  190.                     (EDID_PRODUCT_ID(edid) == quirk->product_id))
  191.                         return quirk->quirks;
  192.         }
  193.  
  194.         return 0;
  195. }
  196.  
  197. #define MODE_SIZE(m) ((m)->hdisplay * (m)->vdisplay)
  198. #define MODE_REFRESH_DIFF(m,r) (abs((m)->vrefresh - target_refresh))
  199.  
  200.  
  201. /**
  202.  * edid_fixup_preferred - set preferred modes based on quirk list
  203.  * @connector: has mode list to fix up
  204.  * @quirks: quirks list
  205.  *
  206.  * Walk the mode list for @connector, clearing the preferred status
  207.  * on existing modes and setting it anew for the right mode ala @quirks.
  208.  */
  209. static void edid_fixup_preferred(struct drm_connector *connector,
  210.                                  u32 quirks)
  211. {
  212.         struct drm_display_mode *t, *cur_mode, *preferred_mode;
  213.         int target_refresh = 0;
  214.  
  215.         if (list_empty(&connector->probed_modes))
  216.                 return;
  217.  
  218.         if (quirks & EDID_QUIRK_PREFER_LARGE_60)
  219.                 target_refresh = 60;
  220.         if (quirks & EDID_QUIRK_PREFER_LARGE_75)
  221.                 target_refresh = 75;
  222.  
  223.         preferred_mode = list_first_entry(&connector->probed_modes,
  224.                                           struct drm_display_mode, head);
  225.  
  226.         list_for_each_entry_safe(cur_mode, t, &connector->probed_modes, head) {
  227.                 cur_mode->type &= ~DRM_MODE_TYPE_PREFERRED;
  228.  
  229.                 if (cur_mode == preferred_mode)
  230.                         continue;
  231.  
  232.                 /* Largest mode is preferred */
  233.                 if (MODE_SIZE(cur_mode) > MODE_SIZE(preferred_mode))
  234.                         preferred_mode = cur_mode;
  235.  
  236.                 /* At a given size, try to get closest to target refresh */
  237.                 if ((MODE_SIZE(cur_mode) == MODE_SIZE(preferred_mode)) &&
  238.                     MODE_REFRESH_DIFF(cur_mode, target_refresh) <
  239.                     MODE_REFRESH_DIFF(preferred_mode, target_refresh)) {
  240.                         preferred_mode = cur_mode;
  241.                 }
  242.         }
  243.  
  244.         preferred_mode->type |= DRM_MODE_TYPE_PREFERRED;
  245. }
  246.  
  247. /**
  248.  * drm_mode_std - convert standard mode info (width, height, refresh) into mode
  249.  * @t: standard timing params
  250.  *
  251.  * Take the standard timing params (in this case width, aspect, and refresh)
  252.  * and convert them into a real mode using CVT.
  253.  *
  254.  * Punts for now, but should eventually use the FB layer's CVT based mode
  255.  * generation code.
  256.  */
  257. struct drm_display_mode *drm_mode_std(struct drm_device *dev,
  258.                                       struct std_timing *t)
  259. {
  260.         struct drm_display_mode *mode;
  261.         int hsize = t->hsize * 8 + 248, vsize;
  262.         unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)
  263.                 >> EDID_TIMING_ASPECT_SHIFT;
  264.  
  265.         mode = drm_mode_create(dev);
  266.         if (!mode)
  267.                 return NULL;
  268.  
  269.         if (aspect_ratio == 0)
  270.                 vsize = (hsize * 10) / 16;
  271.         else if (aspect_ratio == 1)
  272.                 vsize = (hsize * 3) / 4;
  273.         else if (aspect_ratio == 2)
  274.                 vsize = (hsize * 4) / 5;
  275.         else
  276.                 vsize = (hsize * 9) / 16;
  277.  
  278.         drm_mode_set_name(mode);
  279.  
  280.         return mode;
  281. }
  282.  
  283. /**
  284.  * drm_mode_detailed - create a new mode from an EDID detailed timing section
  285.  * @dev: DRM device (needed to create new mode)
  286.  * @edid: EDID block
  287.  * @timing: EDID detailed timing info
  288.  * @quirks: quirks to apply
  289.  *
  290.  * An EDID detailed timing block contains enough info for us to create and
  291.  * return a new struct drm_display_mode.
  292.  */
  293. static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
  294.                                                   struct edid *edid,
  295.                                                   struct detailed_timing *timing,
  296.                                                   u32 quirks)
  297. {
  298.         struct drm_display_mode *mode;
  299.         struct detailed_pixel_timing *pt = &timing->data.pixel_data;
  300.         unsigned hactive = (pt->hactive_hblank_hi & 0xf0) << 4 | pt->hactive_lo;
  301.         unsigned vactive = (pt->vactive_vblank_hi & 0xf0) << 4 | pt->vactive_lo;
  302.         unsigned hblank = (pt->hactive_hblank_hi & 0xf) << 8 | pt->hblank_lo;
  303.         unsigned vblank = (pt->vactive_vblank_hi & 0xf) << 8 | pt->vblank_lo;
  304.         unsigned hsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc0) << 2 | pt->hsync_offset_lo;
  305.         unsigned hsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x30) << 4 | pt->hsync_pulse_width_lo;
  306.         unsigned vsync_offset = (pt->hsync_vsync_offset_pulse_width_hi & 0xc) >> 2 | pt->vsync_offset_pulse_width_lo >> 4;
  307.         unsigned vsync_pulse_width = (pt->hsync_vsync_offset_pulse_width_hi & 0x3) << 4 | (pt->vsync_offset_pulse_width_lo & 0xf);
  308.  
  309.         /* ignore tiny modes */
  310.         if (hactive < 64 || vactive < 64)
  311.                 return NULL;
  312.  
  313.         if (pt->misc & DRM_EDID_PT_STEREO) {
  314.                 printk(KERN_WARNING "stereo mode not supported\n");
  315.                 return NULL;
  316.         }
  317.         if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) {
  318.                 printk(KERN_WARNING "integrated sync not supported\n");
  319.                 return NULL;
  320.         }
  321.  
  322.         mode = drm_mode_create(dev);
  323.         if (!mode)
  324.                 return NULL;
  325.  
  326.         mode->type = DRM_MODE_TYPE_DRIVER;
  327.  
  328.         if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
  329.                 timing->pixel_clock = cpu_to_le16(1088);
  330.  
  331.         mode->clock = le16_to_cpu(timing->pixel_clock) * 10;
  332.  
  333.         mode->hdisplay = hactive;
  334.         mode->hsync_start = mode->hdisplay + hsync_offset;
  335.         mode->hsync_end = mode->hsync_start + hsync_pulse_width;
  336.         mode->htotal = mode->hdisplay + hblank;
  337.  
  338.         mode->vdisplay = vactive;
  339.         mode->vsync_start = mode->vdisplay + vsync_offset;
  340.         mode->vsync_end = mode->vsync_start + vsync_pulse_width;
  341.         mode->vtotal = mode->vdisplay + vblank;
  342.  
  343.         drm_mode_set_name(mode);
  344.  
  345.         if (pt->misc & DRM_EDID_PT_INTERLACED)
  346.                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
  347.  
  348.         if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
  349.                 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
  350.         }
  351.  
  352.         mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ?
  353.                 DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
  354.         mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
  355.                 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
  356.  
  357.         mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
  358.         mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
  359.  
  360.         if (quirks & EDID_QUIRK_DETAILED_IN_CM) {
  361.                 mode->width_mm *= 10;
  362.                 mode->height_mm *= 10;
  363.         }
  364.  
  365.         if (quirks & EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE) {
  366.                 mode->width_mm = edid->width_cm * 10;
  367.                 mode->height_mm = edid->height_cm * 10;
  368.         }
  369.  
  370.         return mode;
  371. }
  372.  
  373. /*
  374.  * Detailed mode info for the EDID "established modes" data to use.
  375.  */
  376. static struct drm_display_mode edid_est_modes[] = {
  377.         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
  378.                    968, 1056, 0, 600, 601, 605, 628, 0,
  379.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@60Hz */
  380.         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 36000, 800, 824,
  381.                    896, 1024, 0, 600, 601, 603,  625, 0,
  382.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@56Hz */
  383.         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 656,
  384.                    720, 840, 0, 480, 481, 484, 500, 0,
  385.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@75Hz */
  386.         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 31500, 640, 664,
  387.                    704,  832, 0, 480, 489, 491, 520, 0,
  388.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@72Hz */
  389.         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 30240, 640, 704,
  390.                    768,  864, 0, 480, 483, 486, 525, 0,
  391.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@67Hz */
  392.         { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25200, 640, 656,
  393.                    752, 800, 0, 480, 490, 492, 525, 0,
  394.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
  395.         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 35500, 720, 738,
  396.                    846, 900, 0, 400, 421, 423,  449, 0,
  397.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 720x400@88Hz */
  398.         { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 28320, 720, 738,
  399.                    846,  900, 0, 400, 412, 414, 449, 0,
  400.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 720x400@70Hz */
  401.         { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 135000, 1280, 1296,
  402.                    1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
  403.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1280x1024@75Hz */
  404.         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 78800, 1024, 1040,
  405.                    1136, 1312, 0,  768, 769, 772, 800, 0,
  406.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1024x768@75Hz */
  407.         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 75000, 1024, 1048,
  408.                    1184, 1328, 0,  768, 771, 777, 806, 0,
  409.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@70Hz */
  410.         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
  411.                    1184, 1344, 0,  768, 771, 777, 806, 0,
  412.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 1024x768@60Hz */
  413.         { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER,44900, 1024, 1032,
  414.                    1208, 1264, 0, 768, 768, 776, 817, 0,
  415.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_INTERLACE) }, /* 1024x768@43Hz */
  416.         { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 57284, 832, 864,
  417.                    928, 1152, 0, 624, 625, 628, 667, 0,
  418.                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 832x624@75Hz */
  419.         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 49500, 800, 816,
  420.                    896, 1056, 0, 600, 601, 604,  625, 0,
  421.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@75Hz */
  422.         { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 50000, 800, 856,
  423.                    976, 1040, 0, 600, 637, 643, 666, 0,
  424.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 800x600@72Hz */
  425.         { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
  426.                    1344, 1600, 0,  864, 865, 868, 900, 0,
  427.                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */
  428. };
  429.  
  430. #define EDID_EST_TIMINGS 16
  431. #define EDID_STD_TIMINGS 8
  432. #define EDID_DETAILED_TIMINGS 4
  433.  
  434. /**
  435.  * add_established_modes - get est. modes from EDID and add them
  436.  * @edid: EDID block to scan
  437.  *
  438.  * Each EDID block contains a bitmap of the supported "established modes" list
  439.  * (defined above).  Tease them out and add them to the global modes list.
  440.  */
  441. static int add_established_modes(struct drm_connector *connector, struct edid *edid)
  442. {
  443.         struct drm_device *dev = connector->dev;
  444.         unsigned long est_bits = edid->established_timings.t1 |
  445.                 (edid->established_timings.t2 << 8) |
  446.                 ((edid->established_timings.mfg_rsvd & 0x80) << 9);
  447.         int i, modes = 0;
  448.  
  449.         for (i = 0; i <= EDID_EST_TIMINGS; i++)
  450.                 if (est_bits & (1<<i)) {
  451.                         struct drm_display_mode *newmode;
  452.                         newmode = drm_mode_duplicate(dev, &edid_est_modes[i]);
  453.                         if (newmode) {
  454.                                 drm_mode_probed_add(connector, newmode);
  455.                                 modes++;
  456.                         }
  457.                 }
  458.  
  459.         return modes;
  460. }
  461.  
  462. /**
  463.  * add_standard_modes - get std. modes from EDID and add them
  464.  * @edid: EDID block to scan
  465.  *
  466.  * Standard modes can be calculated using the CVT standard.  Grab them from
  467.  * @edid, calculate them, and add them to the list.
  468.  */
  469. static int add_standard_modes(struct drm_connector *connector, struct edid *edid)
  470. {
  471.         struct drm_device *dev = connector->dev;
  472.         int i, modes = 0;
  473.  
  474.         for (i = 0; i < EDID_STD_TIMINGS; i++) {
  475.                 struct std_timing *t = &edid->standard_timings[i];
  476.                 struct drm_display_mode *newmode;
  477.  
  478.                 /* If std timings bytes are 1, 1 it's empty */
  479.                 if (t->hsize == 1 && t->vfreq_aspect == 1)
  480.                         continue;
  481.  
  482.                 newmode = drm_mode_std(dev, &edid->standard_timings[i]);
  483.                 if (newmode) {
  484.                         drm_mode_probed_add(connector, newmode);
  485.                         modes++;
  486.                 }
  487.         }
  488.  
  489.         return modes;
  490. }
  491.  
  492. /**
  493.  * add_detailed_modes - get detailed mode info from EDID data
  494.  * @connector: attached connector
  495.  * @edid: EDID block to scan
  496.  * @quirks: quirks to apply
  497.  *
  498.  * Some of the detailed timing sections may contain mode information.  Grab
  499.  * it and add it to the list.
  500.  */
  501. static int add_detailed_info(struct drm_connector *connector,
  502.                              struct edid *edid, u32 quirks)
  503. {
  504.         struct drm_device *dev = connector->dev;
  505.         int i, j, modes = 0;
  506.  
  507.         for (i = 0; i < EDID_DETAILED_TIMINGS; i++) {
  508.                 struct detailed_timing *timing = &edid->detailed_timings[i];
  509.                 struct detailed_non_pixel *data = &timing->data.other_data;
  510.                 struct drm_display_mode *newmode;
  511.  
  512.                 /* EDID up to and including 1.2 may put monitor info here */
  513.                 if (edid->version == 1 && edid->revision < 3)
  514.                         continue;
  515.  
  516.                 /* Detailed mode timing */
  517.                 if (timing->pixel_clock) {
  518.                         newmode = drm_mode_detailed(dev, edid, timing, quirks);
  519.                         if (!newmode)
  520.                                 continue;
  521.  
  522.                         /* First detailed mode is preferred */
  523.                         if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING))
  524.                                 newmode->type |= DRM_MODE_TYPE_PREFERRED;
  525.                         drm_mode_probed_add(connector, newmode);
  526.  
  527.                         modes++;
  528.                         continue;
  529.                 }
  530.  
  531.                 /* Other timing or info */
  532.                 switch (data->type) {
  533.                 case EDID_DETAIL_MONITOR_SERIAL:
  534.                         break;
  535.                 case EDID_DETAIL_MONITOR_STRING:
  536.                         break;
  537.                 case EDID_DETAIL_MONITOR_RANGE:
  538.                         /* Get monitor range data */
  539.                         break;
  540.                 case EDID_DETAIL_MONITOR_NAME:
  541.                         break;
  542.                 case EDID_DETAIL_MONITOR_CPDATA:
  543.                         break;
  544.                 case EDID_DETAIL_STD_MODES:
  545.                         /* Five modes per detailed section */
  546.                         for (j = 0; j < 5; i++) {
  547.                                 struct std_timing *std;
  548.                                 struct drm_display_mode *newmode;
  549.  
  550.                                 std = &data->data.timings[j];
  551.                                 newmode = drm_mode_std(dev, std);
  552.                                 if (newmode) {
  553.                                         drm_mode_probed_add(connector, newmode);
  554.                                         modes++;
  555.                                 }
  556.                         }
  557.                         break;
  558.                 default:
  559.                         break;
  560.                 }
  561.         }
  562.  
  563.         return modes;
  564. }
  565.  
  566. #define DDC_ADDR 0x50
  567. /**
  568.  * Get EDID information via I2C.
  569.  *
  570.  * \param adapter : i2c device adaptor
  571.  * \param buf     : EDID data buffer to be filled
  572.  * \param len     : EDID data buffer length
  573.  * \return 0 on success or -1 on failure.
  574.  *
  575.  * Try to fetch EDID information by calling i2c driver function.
  576.  */
  577. int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
  578.                           unsigned char *buf, int len)
  579. {
  580.         unsigned char start = 0x0;
  581.         struct i2c_msg msgs[] = {
  582.                 {
  583.                         .addr   = DDC_ADDR,
  584.                         .flags  = 0,
  585.                         .len    = 1,
  586.                         .buf    = &start,
  587.                 }, {
  588.                         .addr   = DDC_ADDR,
  589.                         .flags  = I2C_M_RD,
  590.                         .len    = len,
  591.                         .buf    = buf,
  592.                 }
  593.         };
  594.  
  595.         if (i2c_transfer(adapter, msgs, 2) == 2)
  596.                 return 0;
  597.  
  598. //   dev_info(&adapter->dev, "unable to read EDID block.\n");
  599.         return -1;
  600. }
  601. EXPORT_SYMBOL(drm_do_probe_ddc_edid);
  602.  
  603. static int drm_ddc_read_edid(struct drm_connector *connector,
  604.                              struct i2c_adapter *adapter,
  605.                              char *buf, int len)
  606. {
  607.         int ret;
  608.  
  609.         ret = drm_do_probe_ddc_edid(adapter, buf, len);
  610.         if (ret != 0) {
  611. //       dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n",
  612. //            drm_get_connector_name(connector));
  613.                 goto end;
  614.         }
  615.         if (!edid_is_valid((struct edid *)buf)) {
  616. //       dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
  617. //            drm_get_connector_name(connector));
  618.                 ret = -1;
  619.         }
  620. end:
  621.         return ret;
  622. }
  623.  
  624. #define MAX_EDID_EXT_NUM 4
  625. /**
  626.  * drm_get_edid - get EDID data, if available
  627.  * @connector: connector we're probing
  628.  * @adapter: i2c adapter to use for DDC
  629.  *
  630.  * Poke the given connector's i2c channel to grab EDID data if possible.
  631.  *
  632.  * Return edid data or NULL if we couldn't find any.
  633.  */
  634. struct edid *drm_get_edid(struct drm_connector *connector,
  635.                           struct i2c_adapter *adapter)
  636. {
  637.         int ret;
  638.         struct edid *edid;
  639.  
  640.         edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1),
  641.                        GFP_KERNEL);
  642.         if (edid == NULL) {
  643. //       dev_warn(&connector->dev->pdev->dev,
  644. //            "Failed to allocate EDID\n");
  645.                 goto end;
  646.         }
  647.  
  648.         /* Read first EDID block */
  649.         ret = drm_ddc_read_edid(connector, adapter,
  650.                                 (unsigned char *)edid, EDID_LENGTH);
  651.         if (ret != 0)
  652.                 goto clean_up;
  653.  
  654.         /* There are EDID extensions to be read */
  655.         if (edid->extensions != 0) {
  656.                 int edid_ext_num = edid->extensions;
  657.  
  658.                 if (edid_ext_num > MAX_EDID_EXT_NUM) {
  659.  //          dev_warn(&connector->dev->pdev->dev,
  660. //                "The number of extension(%d) is "
  661. //                "over max (%d), actually read number (%d)\n",
  662. //                edid_ext_num, MAX_EDID_EXT_NUM,
  663. //                MAX_EDID_EXT_NUM);
  664.                         /* Reset EDID extension number to be read */
  665.                         edid_ext_num = MAX_EDID_EXT_NUM;
  666.                 }
  667.                 /* Read EDID including extensions too */
  668.                 ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
  669.                                         EDID_LENGTH * (edid_ext_num + 1));
  670.                 if (ret != 0)
  671.                         goto clean_up;
  672.  
  673.         }
  674.  
  675.         connector->display_info.raw_edid = (char *)edid;
  676.         goto end;
  677.  
  678. clean_up:
  679.         kfree(edid);
  680.         edid = NULL;
  681. end:
  682.         return edid;
  683.  
  684. }
  685. EXPORT_SYMBOL(drm_get_edid);
  686.  
  687. #define HDMI_IDENTIFIER 0x000C03
  688. #define VENDOR_BLOCK    0x03
  689. /**
  690.  * drm_detect_hdmi_monitor - detect whether monitor is hdmi.
  691.  * @edid: monitor EDID information
  692.  *
  693.  * Parse the CEA extension according to CEA-861-B.
  694.  * Return true if HDMI, false if not or unknown.
  695.  */
  696. bool drm_detect_hdmi_monitor(struct edid *edid)
  697. {
  698.         char *edid_ext = NULL;
  699.         int i, hdmi_id, edid_ext_num;
  700.         int start_offset, end_offset;
  701.         bool is_hdmi = false;
  702.  
  703.         /* No EDID or EDID extensions */
  704.         if (edid == NULL || edid->extensions == 0)
  705.                 goto end;
  706.  
  707.         /* Chose real EDID extension number */
  708.         edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
  709.                        MAX_EDID_EXT_NUM : edid->extensions;
  710.  
  711.         /* Find CEA extension */
  712.         for (i = 0; i < edid_ext_num; i++) {
  713.                 edid_ext = (char *)edid + EDID_LENGTH * (i + 1);
  714.                 /* This block is CEA extension */
  715.                 if (edid_ext[0] == 0x02)
  716.                         break;
  717.         }
  718.  
  719.         if (i == edid_ext_num)
  720.                 goto end;
  721.  
  722.         /* Data block offset in CEA extension block */
  723.         start_offset = 4;
  724.         end_offset = edid_ext[2];
  725.  
  726.         /*
  727.          * Because HDMI identifier is in Vendor Specific Block,
  728.          * search it from all data blocks of CEA extension.
  729.          */
  730.         for (i = start_offset; i < end_offset;
  731.                 /* Increased by data block len */
  732.                 i += ((edid_ext[i] & 0x1f) + 1)) {
  733.                 /* Find vendor specific block */
  734.                 if ((edid_ext[i] >> 5) == VENDOR_BLOCK) {
  735.                         hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) |
  736.                                   edid_ext[i + 3] << 16;
  737.                         /* Find HDMI identifier */
  738.                         if (hdmi_id == HDMI_IDENTIFIER)
  739.                                 is_hdmi = true;
  740.                         break;
  741.                 }
  742.         }
  743.  
  744. end:
  745.         return is_hdmi;
  746. }
  747. EXPORT_SYMBOL(drm_detect_hdmi_monitor);
  748.  
  749. /**
  750.  * drm_add_edid_modes - add modes from EDID data, if available
  751.  * @connector: connector we're probing
  752.  * @edid: edid data
  753.  *
  754.  * Add the specified modes to the connector's mode list.
  755.  *
  756.  * Return number of modes added or 0 if we couldn't find any.
  757.  */
  758. int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
  759. {
  760.         int num_modes = 0;
  761.         u32 quirks;
  762.  
  763.         if (edid == NULL) {
  764.                 return 0;
  765.         }
  766.         if (!edid_is_valid(edid)) {
  767. //       dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
  768. //            drm_get_connector_name(connector));
  769.                 return 0;
  770.         }
  771.  
  772.         quirks = edid_get_quirks(edid);
  773.  
  774.         num_modes += add_established_modes(connector, edid);
  775.         num_modes += add_standard_modes(connector, edid);
  776.         num_modes += add_detailed_info(connector, edid, quirks);
  777.  
  778.         if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75))
  779.                 edid_fixup_preferred(connector, quirks);
  780.  
  781.         connector->display_info.serration_vsync = (edid->input & DRM_EDID_INPUT_SERRATION_VSYNC) ? 1 : 0;
  782.         connector->display_info.sync_on_green = (edid->input & DRM_EDID_INPUT_SYNC_ON_GREEN) ? 1 : 0;
  783.         connector->display_info.composite_sync = (edid->input & DRM_EDID_INPUT_COMPOSITE_SYNC) ? 1 : 0;
  784.         connector->display_info.separate_syncs = (edid->input & DRM_EDID_INPUT_SEPARATE_SYNCS) ? 1 : 0;
  785.         connector->display_info.blank_to_black = (edid->input & DRM_EDID_INPUT_BLANK_TO_BLACK) ? 1 : 0;
  786.         connector->display_info.video_level = (edid->input & DRM_EDID_INPUT_VIDEO_LEVEL) >> 5;
  787.         connector->display_info.digital = (edid->input & DRM_EDID_INPUT_DIGITAL) ? 1 : 0;
  788.         connector->display_info.width_mm = edid->width_cm * 10;
  789.         connector->display_info.height_mm = edid->height_cm * 10;
  790.         connector->display_info.gamma = edid->gamma;
  791.         connector->display_info.gtf_supported = (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF) ? 1 : 0;
  792.         connector->display_info.standard_color = (edid->features & DRM_EDID_FEATURE_STANDARD_COLOR) ? 1 : 0;
  793.         connector->display_info.display_type = (edid->features & DRM_EDID_FEATURE_DISPLAY_TYPE) >> 3;
  794.         connector->display_info.active_off_supported = (edid->features & DRM_EDID_FEATURE_PM_ACTIVE_OFF) ? 1 : 0;
  795.         connector->display_info.suspend_supported = (edid->features & DRM_EDID_FEATURE_PM_SUSPEND) ? 1 : 0;
  796.         connector->display_info.standby_supported = (edid->features & DRM_EDID_FEATURE_PM_STANDBY) ? 1 : 0;
  797.         connector->display_info.gamma = edid->gamma;
  798.  
  799.         return num_modes;
  800. }
  801. EXPORT_SYMBOL(drm_add_edid_modes);
  802.