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