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  1. /*
  2.  * Copyright (c) 2006-2009 Red Hat Inc.
  3.  * Copyright (c) 2006-2008 Intel Corporation
  4.  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
  5.  *
  6.  * DRM framebuffer helper functions
  7.  *
  8.  * Permission to use, copy, modify, distribute, and sell this software and its
  9.  * documentation for any purpose is hereby granted without fee, provided that
  10.  * the above copyright notice appear in all copies and that both that copyright
  11.  * notice and this permission notice appear in supporting documentation, and
  12.  * that the name of the copyright holders not be used in advertising or
  13.  * publicity pertaining to distribution of the software without specific,
  14.  * written prior permission.  The copyright holders make no representations
  15.  * about the suitability of this software for any purpose.  It is provided "as
  16.  * is" without express or implied warranty.
  17.  *
  18.  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19.  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20.  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21.  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22.  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23.  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24.  * OF THIS SOFTWARE.
  25.  *
  26.  * Authors:
  27.  *      Dave Airlie <airlied@linux.ie>
  28.  *      Jesse Barnes <jesse.barnes@intel.com>
  29.  */
  30. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31.  
  32. #include <linux/kernel.h>
  33. #include <linux/sysrq.h>
  34. #include <linux/slab.h>
  35. #include <linux/fb.h>
  36. #include <linux/module.h>
  37. #include <drm/drmP.h>
  38. #include <drm/drm_crtc.h>
  39. #include <drm/drm_fb_helper.h>
  40. #include <drm/drm_crtc_helper.h>
  41.  
  42. MODULE_AUTHOR("David Airlie, Jesse Barnes");
  43. MODULE_DESCRIPTION("DRM KMS helper");
  44. MODULE_LICENSE("GPL and additional rights");
  45.  
  46. static LIST_HEAD(kernel_fb_helper_list);
  47.  
  48. /**
  49.  * DOC: fbdev helpers
  50.  *
  51.  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  52.  * mode setting driver. They can be used mostly independantely from the crtc
  53.  * helper functions used by many drivers to implement the kernel mode setting
  54.  * interfaces.
  55.  *
  56.  * Initialization is done as a three-step process with drm_fb_helper_init(),
  57.  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  58.  * Drivers with fancier requirements than the default beheviour can override the
  59.  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  60.  *
  61.  * At runtime drivers should restore the fbdev console by calling
  62.  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  63.  * should also notify the fb helper code from updates to the output
  64.  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  65.  * integration with the output polling code in drm_crtc_helper.c the modeset
  66.  * code proves a ->output_poll_changed callback.
  67.  *
  68.  * All other functions exported by the fb helper library can be used to
  69.  * implement the fbdev driver interface by the driver.
  70.  */
  71.  
  72. /**
  73.  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  74.  *                                             emulation helper
  75.  * @fb_helper: fbdev initialized with drm_fb_helper_init
  76.  *
  77.  * This functions adds all the available connectors for use with the given
  78.  * fb_helper. This is a separate step to allow drivers to freely assign
  79.  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  80.  * not adequate to be used for the fbcon.
  81.  *
  82.  * Since this is part of the initial setup before the fbdev is published, no
  83.  * locking is required.
  84.  */
  85. int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  86. {
  87.         struct drm_device *dev = fb_helper->dev;
  88.         struct drm_connector *connector;
  89.         int i;
  90.  
  91.         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  92.                 struct drm_fb_helper_connector *fb_helper_connector;
  93.  
  94.                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  95.                 if (!fb_helper_connector)
  96.                         goto fail;
  97.  
  98.                 fb_helper_connector->connector = connector;
  99.                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  100.         }
  101.         return 0;
  102. fail:
  103.         for (i = 0; i < fb_helper->connector_count; i++) {
  104.                 kfree(fb_helper->connector_info[i]);
  105.                 fb_helper->connector_info[i] = NULL;
  106.         }
  107.         fb_helper->connector_count = 0;
  108.     return -ENOMEM;
  109. }
  110. EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  111.  
  112. static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
  113. {
  114.         uint16_t *r_base, *g_base, *b_base;
  115.         int i;
  116.  
  117.         if (helper->funcs->gamma_get == NULL)
  118.                 return;
  119.  
  120.         r_base = crtc->gamma_store;
  121.         g_base = r_base + crtc->gamma_size;
  122.         b_base = g_base + crtc->gamma_size;
  123.  
  124.         for (i = 0; i < crtc->gamma_size; i++)
  125.                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
  126. }
  127.  
  128. static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
  129. {
  130.         uint16_t *r_base, *g_base, *b_base;
  131.  
  132.         if (crtc->funcs->gamma_set == NULL)
  133.                 return;
  134.  
  135.         r_base = crtc->gamma_store;
  136.         g_base = r_base + crtc->gamma_size;
  137.         b_base = g_base + crtc->gamma_size;
  138.  
  139.         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
  140. }
  141.  
  142.  
  143. static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
  144. {
  145.         struct drm_device *dev = fb_helper->dev;
  146.         struct drm_crtc *crtc;
  147.         int bound = 0, crtcs_bound = 0;
  148.  
  149.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  150.                 if (crtc->fb)
  151.                         crtcs_bound++;
  152.                 if (crtc->fb == fb_helper->fb)
  153.                         bound++;
  154.         }
  155.  
  156.         if (bound < crtcs_bound)
  157.                 return false;
  158.         return true;
  159. }
  160.  
  161. static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
  162. {
  163.         struct drm_fb_helper *fb_helper = info->par;
  164.         struct drm_device *dev = fb_helper->dev;
  165.         struct drm_crtc *crtc;
  166.         struct drm_connector *connector;
  167.         int i, j;
  168.  
  169.         /*
  170.          * fbdev->blank can be called from irq context in case of a panic.
  171.          * Since we already have our own special panic handler which will
  172.          * restore the fbdev console mode completely, just bail out early.
  173.          */
  174.  
  175.         /*
  176.          * For each CRTC in this fb, turn the connectors on/off.
  177.          */
  178.         drm_modeset_lock_all(dev);
  179.         if (!drm_fb_helper_is_bound(fb_helper)) {
  180.                 drm_modeset_unlock_all(dev);
  181.                 return;
  182.         }
  183.  
  184.         for (i = 0; i < fb_helper->crtc_count; i++) {
  185.                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
  186.  
  187.                 if (!crtc->enabled)
  188.                                 continue;
  189.  
  190.                 /* Walk the connectors & encoders on this fb turning them on/off */
  191.                 for (j = 0; j < fb_helper->connector_count; j++) {
  192.                         connector = fb_helper->connector_info[j]->connector;
  193.                         connector->funcs->dpms(connector, dpms_mode);
  194.                         drm_object_property_set_value(&connector->base,
  195.                                 dev->mode_config.dpms_property, dpms_mode);
  196.                 }
  197.         }
  198.         drm_modeset_unlock_all(dev);
  199. }
  200.  
  201. /**
  202.  * drm_fb_helper_blank - implementation for ->fb_blank
  203.  * @blank: desired blanking state
  204.  * @info: fbdev registered by the helper
  205.  */
  206. int drm_fb_helper_blank(int blank, struct fb_info *info)
  207. {
  208.         switch (blank) {
  209.         /* Display: On; HSync: On, VSync: On */
  210.         case FB_BLANK_UNBLANK:
  211.                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
  212.                 break;
  213.         /* Display: Off; HSync: On, VSync: On */
  214.         case FB_BLANK_NORMAL:
  215.                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
  216.                 break;
  217.         /* Display: Off; HSync: Off, VSync: On */
  218.         case FB_BLANK_HSYNC_SUSPEND:
  219.                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
  220.                 break;
  221.         /* Display: Off; HSync: On, VSync: Off */
  222.         case FB_BLANK_VSYNC_SUSPEND:
  223.                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
  224.                 break;
  225.         /* Display: Off; HSync: Off, VSync: Off */
  226.         case FB_BLANK_POWERDOWN:
  227.                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
  228.                 break;
  229.         }
  230.         return 0;
  231. }
  232. EXPORT_SYMBOL(drm_fb_helper_blank);
  233.  
  234. static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
  235. {
  236.         int i;
  237.  
  238.         for (i = 0; i < helper->connector_count; i++)
  239.                 kfree(helper->connector_info[i]);
  240.         kfree(helper->connector_info);
  241.         for (i = 0; i < helper->crtc_count; i++) {
  242.                 kfree(helper->crtc_info[i].mode_set.connectors);
  243.                 if (helper->crtc_info[i].mode_set.mode)
  244.                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
  245.         }
  246.         kfree(helper->crtc_info);
  247. }
  248.  
  249. /**
  250.  * drm_fb_helper_init - initialize a drm_fb_helper structure
  251.  * @dev: drm device
  252.  * @fb_helper: driver-allocated fbdev helper structure to initialize
  253.  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
  254.  * @max_conn_count: max connector count
  255.  *
  256.  * This allocates the structures for the fbdev helper with the given limits.
  257.  * Note that this won't yet touch the hardware (through the driver interfaces)
  258.  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
  259.  * to allow driver writes more control over the exact init sequence.
  260.  *
  261.  * Drivers must set fb_helper->funcs before calling
  262.  * drm_fb_helper_initial_config().
  263.  *
  264.  * RETURNS:
  265.  * Zero if everything went ok, nonzero otherwise.
  266.  */
  267. int drm_fb_helper_init(struct drm_device *dev,
  268.                        struct drm_fb_helper *fb_helper,
  269.                        int crtc_count, int max_conn_count)
  270. {
  271.         struct drm_crtc *crtc;
  272.         int i;
  273.  
  274.         fb_helper->dev = dev;
  275.  
  276.         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
  277.  
  278.         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
  279.         if (!fb_helper->crtc_info)
  280.                 return -ENOMEM;
  281.  
  282.         fb_helper->crtc_count = crtc_count;
  283.         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
  284.         if (!fb_helper->connector_info) {
  285.                 kfree(fb_helper->crtc_info);
  286.                 return -ENOMEM;
  287.         }
  288.         fb_helper->connector_count = 0;
  289.  
  290.         for (i = 0; i < crtc_count; i++) {
  291.                 fb_helper->crtc_info[i].mode_set.connectors =
  292.                         kcalloc(max_conn_count,
  293.                                 sizeof(struct drm_connector *),
  294.                                 GFP_KERNEL);
  295.  
  296.                 if (!fb_helper->crtc_info[i].mode_set.connectors)
  297.                         goto out_free;
  298.                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
  299.         }
  300.  
  301.         i = 0;
  302.         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  303.                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
  304.                 i++;
  305.         }
  306.  
  307.         return 0;
  308. out_free:
  309.         drm_fb_helper_crtc_free(fb_helper);
  310.         return -ENOMEM;
  311. }
  312. EXPORT_SYMBOL(drm_fb_helper_init);
  313.  
  314. static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
  315.                      u16 blue, u16 regno, struct fb_info *info)
  316. {
  317.         struct drm_fb_helper *fb_helper = info->par;
  318.         struct drm_framebuffer *fb = fb_helper->fb;
  319.         int pindex;
  320.  
  321.         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
  322.                 u32 *palette;
  323.                 u32 value;
  324.                 /* place color in psuedopalette */
  325.                 if (regno > 16)
  326.                         return -EINVAL;
  327.                 palette = (u32 *)info->pseudo_palette;
  328.                 red >>= (16 - info->var.red.length);
  329.                 green >>= (16 - info->var.green.length);
  330.                 blue >>= (16 - info->var.blue.length);
  331.                 value = (red << info->var.red.offset) |
  332.                         (green << info->var.green.offset) |
  333.                         (blue << info->var.blue.offset);
  334.                 if (info->var.transp.length > 0) {
  335.                         u32 mask = (1 << info->var.transp.length) - 1;
  336.                         mask <<= info->var.transp.offset;
  337.                         value |= mask;
  338.                 }
  339.                 palette[regno] = value;
  340.                 return 0;
  341.         }
  342.  
  343.         /*
  344.          * The driver really shouldn't advertise pseudo/directcolor
  345.          * visuals if it can't deal with the palette.
  346.          */
  347.         if (WARN_ON(!fb_helper->funcs->gamma_set ||
  348.                     !fb_helper->funcs->gamma_get))
  349.                 return -EINVAL;
  350.  
  351.         pindex = regno;
  352.  
  353.         if (fb->bits_per_pixel == 16) {
  354.                 pindex = regno << 3;
  355.  
  356.                 if (fb->depth == 16 && regno > 63)
  357.                         return -EINVAL;
  358.                 if (fb->depth == 15 && regno > 31)
  359.                         return -EINVAL;
  360.  
  361.                 if (fb->depth == 16) {
  362.                         u16 r, g, b;
  363.                         int i;
  364.                         if (regno < 32) {
  365.                                 for (i = 0; i < 8; i++)
  366.                                         fb_helper->funcs->gamma_set(crtc, red,
  367.                                                 green, blue, pindex + i);
  368.                         }
  369.  
  370.                         fb_helper->funcs->gamma_get(crtc, &r,
  371.                                                     &g, &b,
  372.                                                     pindex >> 1);
  373.  
  374.                         for (i = 0; i < 4; i++)
  375.                                 fb_helper->funcs->gamma_set(crtc, r,
  376.                                                             green, b,
  377.                                                             (pindex >> 1) + i);
  378.                 }
  379.         }
  380.  
  381.         if (fb->depth != 16)
  382.                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
  383.         return 0;
  384. }
  385.  
  386. /**
  387.  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
  388.  * @cmap: cmap to set
  389.  * @info: fbdev registered by the helper
  390.  */
  391. int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
  392. {
  393.         struct drm_fb_helper *fb_helper = info->par;
  394.         struct drm_device *dev = fb_helper->dev;
  395.         struct drm_crtc_helper_funcs *crtc_funcs;
  396.         u16 *red, *green, *blue, *transp;
  397.         struct drm_crtc *crtc;
  398.         int i, j, rc = 0;
  399.         int start;
  400.  
  401.         drm_modeset_lock_all(dev);
  402.         if (!drm_fb_helper_is_bound(fb_helper)) {
  403.                 drm_modeset_unlock_all(dev);
  404.                 return -EBUSY;
  405.         }
  406.  
  407.                 for (i = 0; i < fb_helper->crtc_count; i++) {
  408.                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
  409.                 crtc_funcs = crtc->helper_private;
  410.  
  411.                 red = cmap->red;
  412.                 green = cmap->green;
  413.                 blue = cmap->blue;
  414.                 transp = cmap->transp;
  415.                 start = cmap->start;
  416.  
  417.                 for (j = 0; j < cmap->len; j++) {
  418.                         u16 hred, hgreen, hblue, htransp = 0xffff;
  419.  
  420.                         hred = *red++;
  421.                         hgreen = *green++;
  422.                         hblue = *blue++;
  423.  
  424.                         if (transp)
  425.                                 htransp = *transp++;
  426.  
  427.                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
  428.                         if (rc)
  429.                                 goto out;
  430.                 }
  431.                 if (crtc_funcs->load_lut)
  432.                 crtc_funcs->load_lut(crtc);
  433.         }
  434.  out:
  435.         drm_modeset_unlock_all(dev);
  436.         return rc;
  437. }
  438. EXPORT_SYMBOL(drm_fb_helper_setcmap);
  439.  
  440. /**
  441.  * drm_fb_helper_check_var - implementation for ->fb_check_var
  442.  * @var: screeninfo to check
  443.  * @info: fbdev registered by the helper
  444.  */
  445. int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
  446.                             struct fb_info *info)
  447. {
  448.         struct drm_fb_helper *fb_helper = info->par;
  449.         struct drm_framebuffer *fb = fb_helper->fb;
  450.         int depth;
  451.  
  452.         if (var->pixclock != 0 || in_dbg_master())
  453.                 return -EINVAL;
  454.  
  455.         /* Need to resize the fb object !!! */
  456.         if (var->bits_per_pixel > fb->bits_per_pixel ||
  457.             var->xres > fb->width || var->yres > fb->height ||
  458.             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
  459.                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
  460.                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
  461.                           var->xres, var->yres, var->bits_per_pixel,
  462.                           var->xres_virtual, var->yres_virtual,
  463.                           fb->width, fb->height, fb->bits_per_pixel);
  464.                 return -EINVAL;
  465.         }
  466.  
  467.         switch (var->bits_per_pixel) {
  468.         case 16:
  469.                 depth = (var->green.length == 6) ? 16 : 15;
  470.                 break;
  471.         case 32:
  472.                 depth = (var->transp.length > 0) ? 32 : 24;
  473.                 break;
  474.         default:
  475.                 depth = var->bits_per_pixel;
  476.                 break;
  477.         }
  478.  
  479.         switch (depth) {
  480.         case 8:
  481.                 var->red.offset = 0;
  482.                 var->green.offset = 0;
  483.                 var->blue.offset = 0;
  484.                 var->red.length = 8;
  485.                 var->green.length = 8;
  486.                 var->blue.length = 8;
  487.                 var->transp.length = 0;
  488.                 var->transp.offset = 0;
  489.                 break;
  490.         case 15:
  491.                 var->red.offset = 10;
  492.                 var->green.offset = 5;
  493.                 var->blue.offset = 0;
  494.                 var->red.length = 5;
  495.                 var->green.length = 5;
  496.                 var->blue.length = 5;
  497.                 var->transp.length = 1;
  498.                 var->transp.offset = 15;
  499.                 break;
  500.         case 16:
  501.                 var->red.offset = 11;
  502.                 var->green.offset = 5;
  503.                 var->blue.offset = 0;
  504.                 var->red.length = 5;
  505.                 var->green.length = 6;
  506.                 var->blue.length = 5;
  507.                 var->transp.length = 0;
  508.                 var->transp.offset = 0;
  509.                 break;
  510.         case 24:
  511.                 var->red.offset = 16;
  512.                 var->green.offset = 8;
  513.                 var->blue.offset = 0;
  514.                 var->red.length = 8;
  515.                 var->green.length = 8;
  516.                 var->blue.length = 8;
  517.                 var->transp.length = 0;
  518.                 var->transp.offset = 0;
  519.                 break;
  520.         case 32:
  521.                 var->red.offset = 16;
  522.                 var->green.offset = 8;
  523.                 var->blue.offset = 0;
  524.                 var->red.length = 8;
  525.                 var->green.length = 8;
  526.                 var->blue.length = 8;
  527.                 var->transp.length = 8;
  528.                 var->transp.offset = 24;
  529.                 break;
  530.         default:
  531.                 return -EINVAL;
  532.         }
  533.         return 0;
  534. }
  535. EXPORT_SYMBOL(drm_fb_helper_check_var);
  536.  
  537. /**
  538.  * drm_fb_helper_set_par - implementation for ->fb_set_par
  539.  * @info: fbdev registered by the helper
  540.  *
  541.  * This will let fbcon do the mode init and is called at initialization time by
  542.  * the fbdev core when registering the driver, and later on through the hotplug
  543.  * callback.
  544.  */
  545. int drm_fb_helper_set_par(struct fb_info *info)
  546. {
  547.         struct drm_fb_helper *fb_helper = info->par;
  548.         struct drm_device *dev = fb_helper->dev;
  549.         struct fb_var_screeninfo *var = &info->var;
  550.         int ret;
  551.         int i;
  552.  
  553.         if (var->pixclock != 0) {
  554.                 DRM_ERROR("PIXEL CLOCK SET\n");
  555.                 return -EINVAL;
  556.         }
  557.  
  558.         drm_modeset_lock_all(dev);
  559.                 for (i = 0; i < fb_helper->crtc_count; i++) {
  560.                 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
  561.                 if (ret) {
  562.                         drm_modeset_unlock_all(dev);
  563.                                 return ret;
  564.                 }
  565.         }
  566.         drm_modeset_unlock_all(dev);
  567.  
  568.         if (fb_helper->delayed_hotplug) {
  569.                 fb_helper->delayed_hotplug = false;
  570.                 drm_fb_helper_hotplug_event(fb_helper);
  571.         }
  572.         return 0;
  573. }
  574. EXPORT_SYMBOL(drm_fb_helper_set_par);
  575.  
  576. /**
  577.  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
  578.  * @var: updated screen information
  579.  * @info: fbdev registered by the helper
  580.  */
  581. int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
  582.                               struct fb_info *info)
  583. {
  584.         struct drm_fb_helper *fb_helper = info->par;
  585.         struct drm_device *dev = fb_helper->dev;
  586.         struct drm_mode_set *modeset;
  587.         struct drm_crtc *crtc;
  588.         int ret = 0;
  589.         int i;
  590.  
  591.         drm_modeset_lock_all(dev);
  592.         if (!drm_fb_helper_is_bound(fb_helper)) {
  593.                 drm_modeset_unlock_all(dev);
  594.                 return -EBUSY;
  595.         }
  596.  
  597.                 for (i = 0; i < fb_helper->crtc_count; i++) {
  598.                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
  599.  
  600.                 modeset = &fb_helper->crtc_info[i].mode_set;
  601.  
  602.                 modeset->x = var->xoffset;
  603.                 modeset->y = var->yoffset;
  604.  
  605.                 if (modeset->num_connectors) {
  606.                         ret = drm_mode_set_config_internal(modeset);
  607.                         if (!ret) {
  608.                                 info->var.xoffset = var->xoffset;
  609.                                 info->var.yoffset = var->yoffset;
  610.                         }
  611.                 }
  612.         }
  613.         drm_modeset_unlock_all(dev);
  614.         return ret;
  615. }
  616. EXPORT_SYMBOL(drm_fb_helper_pan_display);
  617.  
  618. /*
  619.  * Allocates the backing storage and sets up the fbdev info structure through
  620.  * the ->fb_probe callback and then registers the fbdev and sets up the panic
  621.  * notifier.
  622.  */
  623. static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
  624.                                   int preferred_bpp)
  625. {
  626.         int ret = 0;
  627.         int crtc_count = 0;
  628.         int i;
  629.         struct fb_info *info;
  630.         struct drm_fb_helper_surface_size sizes;
  631.         int gamma_size = 0;
  632.  
  633.         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
  634.         sizes.surface_depth = 24;
  635.         sizes.surface_bpp = 32;
  636.         sizes.fb_width = (unsigned)-1;
  637.         sizes.fb_height = (unsigned)-1;
  638.  
  639.         /* if driver picks 8 or 16 by default use that
  640.            for both depth/bpp */
  641.         if (preferred_bpp != sizes.surface_bpp)
  642.                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
  643.  
  644.         /* first up get a count of crtcs now in use and new min/maxes width/heights */
  645.         for (i = 0; i < fb_helper->connector_count; i++) {
  646.                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
  647.                 struct drm_cmdline_mode *cmdline_mode;
  648.  
  649.                 cmdline_mode = &fb_helper_conn->cmdline_mode;
  650.  
  651.                 if (cmdline_mode->bpp_specified) {
  652.                         switch (cmdline_mode->bpp) {
  653.                         case 8:
  654.                                 sizes.surface_depth = sizes.surface_bpp = 8;
  655.                                 break;
  656.                         case 15:
  657.                                 sizes.surface_depth = 15;
  658.                                 sizes.surface_bpp = 16;
  659.                                 break;
  660.                         case 16:
  661.                                 sizes.surface_depth = sizes.surface_bpp = 16;
  662.                                 break;
  663.                         case 24:
  664.                                 sizes.surface_depth = sizes.surface_bpp = 24;
  665.                                 break;
  666.                         case 32:
  667.     sizes.surface_depth = 24;
  668.     sizes.surface_bpp = 32;
  669.                                 break;
  670.                         }
  671.                         break;
  672.                 }
  673.         }
  674.  
  675.         crtc_count = 0;
  676.         for (i = 0; i < fb_helper->crtc_count; i++) {
  677.                 struct drm_display_mode *desired_mode;
  678.                 desired_mode = fb_helper->crtc_info[i].desired_mode;
  679.  
  680.                 if (desired_mode) {
  681.                         if (gamma_size == 0)
  682.                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
  683.                         if (desired_mode->hdisplay < sizes.fb_width)
  684.                                 sizes.fb_width = desired_mode->hdisplay;
  685.                         if (desired_mode->vdisplay < sizes.fb_height)
  686.                                 sizes.fb_height = desired_mode->vdisplay;
  687.                         if (desired_mode->hdisplay > sizes.surface_width)
  688.                                 sizes.surface_width = desired_mode->hdisplay;
  689.                         if (desired_mode->vdisplay > sizes.surface_height)
  690.                                 sizes.surface_height = desired_mode->vdisplay;
  691.                         crtc_count++;
  692.                 }
  693.         }
  694.  
  695.         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
  696.                 /* hmm everyone went away - assume VGA cable just fell out
  697.                    and will come back later. */
  698.                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
  699.                 sizes.fb_width = sizes.surface_width = 1024;
  700.                 sizes.fb_height = sizes.surface_height = 768;
  701.         }
  702.  
  703.         /* push down into drivers */
  704.         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
  705.         if (ret < 0)
  706.                 return ret;
  707.  
  708.         info = fb_helper->fbdev;
  709.  
  710.         /*
  711.          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
  712.          * events, but at init time drm_setup_crtcs needs to be called before
  713.          * the fb is allocated (since we need to figure out the desired size of
  714.          * the fb before we can allocate it ...). Hence we need to fix things up
  715.          * here again.
  716.          */
  717.         for (i = 0; i < fb_helper->crtc_count; i++)
  718.                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
  719.                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
  720.  
  721.  
  722.                 info->var.pixclock = 0;
  723.  
  724.         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
  725.  
  726.         return 0;
  727. }
  728.  
  729. /**
  730.  * drm_fb_helper_fill_fix - initializes fixed fbdev information
  731.  * @info: fbdev registered by the helper
  732.  * @pitch: desired pitch
  733.  * @depth: desired depth
  734.  *
  735.  * Helper to fill in the fixed fbdev information useful for a non-accelerated
  736.  * fbdev emulations. Drivers which support acceleration methods which impose
  737.  * additional constraints need to set up their own limits.
  738.  *
  739.  * Drivers should call this (or their equivalent setup code) from their
  740.  * ->fb_probe callback.
  741.  */
  742. void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
  743.                             uint32_t depth)
  744. {
  745.         info->fix.type = FB_TYPE_PACKED_PIXELS;
  746.         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
  747.                 FB_VISUAL_TRUECOLOR;
  748.         info->fix.mmio_start = 0;
  749.         info->fix.mmio_len = 0;
  750.         info->fix.type_aux = 0;
  751.         info->fix.xpanstep = 1; /* doing it in hw */
  752.         info->fix.ypanstep = 1; /* doing it in hw */
  753.         info->fix.ywrapstep = 0;
  754.         info->fix.accel = FB_ACCEL_NONE;
  755.         info->fix.type_aux = 0;
  756.  
  757.         info->fix.line_length = pitch;
  758.         return;
  759. }
  760. EXPORT_SYMBOL(drm_fb_helper_fill_fix);
  761.  
  762. /**
  763.  * drm_fb_helper_fill_var - initalizes variable fbdev information
  764.  * @info: fbdev instance to set up
  765.  * @fb_helper: fb helper instance to use as template
  766.  * @fb_width: desired fb width
  767.  * @fb_height: desired fb height
  768.  *
  769.  * Sets up the variable fbdev metainformation from the given fb helper instance
  770.  * and the drm framebuffer allocated in fb_helper->fb.
  771.  *
  772.  * Drivers should call this (or their equivalent setup code) from their
  773.  * ->fb_probe callback after having allocated the fbdev backing
  774.  * storage framebuffer.
  775.  */
  776. void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
  777.                             uint32_t fb_width, uint32_t fb_height)
  778. {
  779.         struct drm_framebuffer *fb = fb_helper->fb;
  780.         info->pseudo_palette = fb_helper->pseudo_palette;
  781.         info->var.xres_virtual = fb->width;
  782.         info->var.yres_virtual = fb->height;
  783.         info->var.bits_per_pixel = fb->bits_per_pixel;
  784.         info->var.accel_flags = FB_ACCELF_TEXT;
  785.         info->var.xoffset = 0;
  786.         info->var.yoffset = 0;
  787.         info->var.activate = FB_ACTIVATE_NOW;
  788.         info->var.height = -1;
  789.         info->var.width = -1;
  790.  
  791.         switch (fb->depth) {
  792.         case 8:
  793.                 info->var.red.offset = 0;
  794.                 info->var.green.offset = 0;
  795.                 info->var.blue.offset = 0;
  796.                 info->var.red.length = 8; /* 8bit DAC */
  797.                 info->var.green.length = 8;
  798.                 info->var.blue.length = 8;
  799.                 info->var.transp.offset = 0;
  800.                 info->var.transp.length = 0;
  801.                 break;
  802.         case 15:
  803.                 info->var.red.offset = 10;
  804.                 info->var.green.offset = 5;
  805.                 info->var.blue.offset = 0;
  806.                 info->var.red.length = 5;
  807.                 info->var.green.length = 5;
  808.                 info->var.blue.length = 5;
  809.                 info->var.transp.offset = 15;
  810.                 info->var.transp.length = 1;
  811.                 break;
  812.         case 16:
  813.                 info->var.red.offset = 11;
  814.                 info->var.green.offset = 5;
  815.                 info->var.blue.offset = 0;
  816.                 info->var.red.length = 5;
  817.                 info->var.green.length = 6;
  818.                 info->var.blue.length = 5;
  819.                 info->var.transp.offset = 0;
  820.                 break;
  821.         case 24:
  822.                 info->var.red.offset = 16;
  823.                 info->var.green.offset = 8;
  824.                 info->var.blue.offset = 0;
  825.                 info->var.red.length = 8;
  826.                 info->var.green.length = 8;
  827.                 info->var.blue.length = 8;
  828.                 info->var.transp.offset = 0;
  829.                 info->var.transp.length = 0;
  830.                 break;
  831.         case 32:
  832.                 info->var.red.offset = 16;
  833.                 info->var.green.offset = 8;
  834.                 info->var.blue.offset = 0;
  835.                 info->var.red.length = 8;
  836.                 info->var.green.length = 8;
  837.                 info->var.blue.length = 8;
  838.                 info->var.transp.offset = 24;
  839.                 info->var.transp.length = 8;
  840.                 break;
  841.         default:
  842.                 break;
  843.         }
  844.  
  845.         info->var.xres = fb_width;
  846.         info->var.yres = fb_height;
  847. }
  848. EXPORT_SYMBOL(drm_fb_helper_fill_var);
  849.  
  850. static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
  851.                                                uint32_t maxX,
  852.                                                uint32_t maxY)
  853. {
  854.         struct drm_connector *connector;
  855.         int count = 0;
  856.         int i;
  857.  
  858.         for (i = 0; i < fb_helper->connector_count; i++) {
  859.                 connector = fb_helper->connector_info[i]->connector;
  860.                 count += connector->funcs->fill_modes(connector, maxX, maxY);
  861.         }
  862.  
  863.         return count;
  864. }
  865.  
  866. static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
  867. {
  868.         struct drm_display_mode *mode;
  869.  
  870.         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
  871.                 if (drm_mode_width(mode) > width ||
  872.                     drm_mode_height(mode) > height)
  873.                         continue;
  874.                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
  875.                         return mode;
  876.         }
  877.         return NULL;
  878. }
  879.  
  880. static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
  881. {
  882.         struct drm_cmdline_mode *cmdline_mode;
  883.         cmdline_mode = &fb_connector->cmdline_mode;
  884.         return cmdline_mode->specified;
  885. }
  886.  
  887. static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
  888.                                                       int width, int height)
  889. {
  890.         struct drm_cmdline_mode *cmdline_mode;
  891.         struct drm_display_mode *mode = NULL;
  892.  
  893.         return NULL;
  894.  
  895.         cmdline_mode = &fb_helper_conn->cmdline_mode;
  896.         if (cmdline_mode->specified == false)
  897.                 return mode;
  898.  
  899.         /* attempt to find a matching mode in the list of modes
  900.          *  we have gotten so far, if not add a CVT mode that conforms
  901.          */
  902.         if (cmdline_mode->rb || cmdline_mode->margins)
  903.                 goto create_mode;
  904.  
  905.         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
  906.                 /* check width/height */
  907.                 if (mode->hdisplay != cmdline_mode->xres ||
  908.                     mode->vdisplay != cmdline_mode->yres)
  909.                         continue;
  910.  
  911.                 if (cmdline_mode->refresh_specified) {
  912.                         if (mode->vrefresh != cmdline_mode->refresh)
  913.                                 continue;
  914.                 }
  915.  
  916.                 if (cmdline_mode->interlace) {
  917.                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
  918.                                 continue;
  919.                 }
  920.                 return mode;
  921.         }
  922.  
  923. create_mode:
  924.         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
  925.                                                  cmdline_mode);
  926.         list_add(&mode->head, &fb_helper_conn->connector->modes);
  927.         return mode;
  928. }
  929.  
  930. static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
  931. {
  932.         bool enable;
  933.  
  934.         if (strict)
  935.                 enable = connector->status == connector_status_connected;
  936.         else
  937.                 enable = connector->status != connector_status_disconnected;
  938.  
  939.         return enable;
  940. }
  941.  
  942. static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
  943.                                   bool *enabled)
  944. {
  945.         bool any_enabled = false;
  946.         struct drm_connector *connector;
  947.         int i = 0;
  948.  
  949.         for (i = 0; i < fb_helper->connector_count; i++) {
  950.                 connector = fb_helper->connector_info[i]->connector;
  951.                 enabled[i] = drm_connector_enabled(connector, true);
  952.                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
  953.                           enabled[i] ? "yes" : "no");
  954.                 any_enabled |= enabled[i];
  955.         }
  956.  
  957.         if (any_enabled)
  958.                 return;
  959.  
  960.         for (i = 0; i < fb_helper->connector_count; i++) {
  961.                 connector = fb_helper->connector_info[i]->connector;
  962.                 enabled[i] = drm_connector_enabled(connector, false);
  963.         }
  964. }
  965.  
  966. static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
  967.                               struct drm_display_mode **modes,
  968.                               bool *enabled, int width, int height)
  969. {
  970.         int count, i, j;
  971.         bool can_clone = false;
  972.         struct drm_fb_helper_connector *fb_helper_conn;
  973.         struct drm_display_mode *dmt_mode, *mode;
  974.  
  975.         /* only contemplate cloning in the single crtc case */
  976.         if (fb_helper->crtc_count > 1)
  977.                 return false;
  978.  
  979.         count = 0;
  980.         for (i = 0; i < fb_helper->connector_count; i++) {
  981.                 if (enabled[i])
  982.                         count++;
  983.         }
  984.  
  985.         /* only contemplate cloning if more than one connector is enabled */
  986.         if (count <= 1)
  987.                 return false;
  988.  
  989.         /* check the command line or if nothing common pick 1024x768 */
  990.         can_clone = true;
  991.         for (i = 0; i < fb_helper->connector_count; i++) {
  992.                 if (!enabled[i])
  993.                         continue;
  994.                 fb_helper_conn = fb_helper->connector_info[i];
  995.                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
  996.                 if (!modes[i]) {
  997.                         can_clone = false;
  998.                         break;
  999.                 }
  1000.                 for (j = 0; j < i; j++) {
  1001.                         if (!enabled[j])
  1002.                                 continue;
  1003.                         if (!drm_mode_equal(modes[j], modes[i]))
  1004.                                 can_clone = false;
  1005.                 }
  1006.         }
  1007.  
  1008.         if (can_clone) {
  1009.                 DRM_DEBUG_KMS("can clone using command line\n");
  1010.                 return true;
  1011.         }
  1012.  
  1013.         /* try and find a 1024x768 mode on each connector */
  1014.         can_clone = true;
  1015.         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
  1016.  
  1017.         for (i = 0; i < fb_helper->connector_count; i++) {
  1018.  
  1019.                 if (!enabled[i])
  1020.                         continue;
  1021.  
  1022.                 fb_helper_conn = fb_helper->connector_info[i];
  1023.                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
  1024.                         if (drm_mode_equal(mode, dmt_mode))
  1025.                                 modes[i] = mode;
  1026.                 }
  1027.                 if (!modes[i])
  1028.                         can_clone = false;
  1029.         }
  1030.  
  1031.         if (can_clone) {
  1032.                 DRM_DEBUG_KMS("can clone using 1024x768\n");
  1033.                 return true;
  1034.         }
  1035.         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
  1036.         return false;
  1037. }
  1038.  
  1039. static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
  1040.                                  struct drm_display_mode **modes,
  1041.                                  bool *enabled, int width, int height)
  1042. {
  1043.         struct drm_fb_helper_connector *fb_helper_conn;
  1044.         int i;
  1045.  
  1046.         for (i = 0; i < fb_helper->connector_count; i++) {
  1047.                 fb_helper_conn = fb_helper->connector_info[i];
  1048.  
  1049.                 if (enabled[i] == false)
  1050.                         continue;
  1051.  
  1052.                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
  1053.                               fb_helper_conn->connector->base.id);
  1054.  
  1055.                 /* got for command line mode first */
  1056.                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
  1057.                 if (!modes[i]) {
  1058.                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
  1059.                                       fb_helper_conn->connector->base.id);
  1060.                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
  1061.                 }
  1062.                 /* No preferred modes, pick one off the list */
  1063.                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
  1064.                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
  1065.                                 break;
  1066.                 }
  1067.                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
  1068.                           "none");
  1069.         }
  1070.         return true;
  1071. }
  1072.  
  1073. static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
  1074.                           struct drm_fb_helper_crtc **best_crtcs,
  1075.                           struct drm_display_mode **modes,
  1076.                           int n, int width, int height)
  1077. {
  1078.         int c, o;
  1079.         struct drm_device *dev = fb_helper->dev;
  1080.         struct drm_connector *connector;
  1081.         struct drm_connector_helper_funcs *connector_funcs;
  1082.         struct drm_encoder *encoder;
  1083.         struct drm_fb_helper_crtc *best_crtc;
  1084.         int my_score, best_score, score;
  1085.         struct drm_fb_helper_crtc **crtcs, *crtc;
  1086.         struct drm_fb_helper_connector *fb_helper_conn;
  1087.  
  1088.         if (n == fb_helper->connector_count)
  1089.                 return 0;
  1090.  
  1091.         fb_helper_conn = fb_helper->connector_info[n];
  1092.         connector = fb_helper_conn->connector;
  1093.  
  1094.         best_crtcs[n] = NULL;
  1095.         best_crtc = NULL;
  1096.         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
  1097.         if (modes[n] == NULL)
  1098.                 return best_score;
  1099.  
  1100.         crtcs = kzalloc(dev->mode_config.num_connector *
  1101.                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
  1102.         if (!crtcs)
  1103.                 return best_score;
  1104.  
  1105.         my_score = 1;
  1106.         if (connector->status == connector_status_connected)
  1107.                 my_score++;
  1108.         if (drm_has_cmdline_mode(fb_helper_conn))
  1109.                 my_score++;
  1110.         if (drm_has_preferred_mode(fb_helper_conn, width, height))
  1111.                 my_score++;
  1112.  
  1113.         connector_funcs = connector->helper_private;
  1114.         encoder = connector_funcs->best_encoder(connector);
  1115.         if (!encoder)
  1116.                 goto out;
  1117.  
  1118.         /* select a crtc for this connector and then attempt to configure
  1119.            remaining connectors */
  1120.         for (c = 0; c < fb_helper->crtc_count; c++) {
  1121.                 crtc = &fb_helper->crtc_info[c];
  1122.  
  1123.                 if ((encoder->possible_crtcs & (1 << c)) == 0)
  1124.                         continue;
  1125.  
  1126.                 for (o = 0; o < n; o++)
  1127.                         if (best_crtcs[o] == crtc)
  1128.                                 break;
  1129.  
  1130.                 if (o < n) {
  1131.                         /* ignore cloning unless only a single crtc */
  1132.                         if (fb_helper->crtc_count > 1)
  1133.                                 continue;
  1134.  
  1135.                         if (!drm_mode_equal(modes[o], modes[n]))
  1136.                                 continue;
  1137.                 }
  1138.  
  1139.                 crtcs[n] = crtc;
  1140.                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
  1141.                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
  1142.                                                   width, height);
  1143.                 if (score > best_score) {
  1144.                         best_crtc = crtc;
  1145.                         best_score = score;
  1146.                         memcpy(best_crtcs, crtcs,
  1147.                                dev->mode_config.num_connector *
  1148.                                sizeof(struct drm_fb_helper_crtc *));
  1149.                 }
  1150.         }
  1151. out:
  1152.         kfree(crtcs);
  1153.         return best_score;
  1154. }
  1155.  
  1156. static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
  1157. {
  1158.         struct drm_device *dev = fb_helper->dev;
  1159.         struct drm_fb_helper_crtc **crtcs;
  1160.         struct drm_display_mode **modes;
  1161.         struct drm_mode_set *modeset;
  1162.         bool *enabled;
  1163.         int width, height;
  1164.         int i;
  1165.  
  1166.         DRM_DEBUG_KMS("\n");
  1167.  
  1168.         width = dev->mode_config.max_width;
  1169.         height = dev->mode_config.max_height;
  1170.  
  1171.         crtcs = kcalloc(dev->mode_config.num_connector,
  1172.                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
  1173.         modes = kcalloc(dev->mode_config.num_connector,
  1174.                         sizeof(struct drm_display_mode *), GFP_KERNEL);
  1175.         enabled = kcalloc(dev->mode_config.num_connector,
  1176.                           sizeof(bool), GFP_KERNEL);
  1177.         if (!crtcs || !modes || !enabled) {
  1178.                 DRM_ERROR("Memory allocation failed\n");
  1179.                 goto out;
  1180.         }
  1181.  
  1182.  
  1183.         drm_enable_connectors(fb_helper, enabled);
  1184.  
  1185.         if (!(fb_helper->funcs->initial_config &&
  1186.               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
  1187.                                                enabled, width, height))) {
  1188.                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
  1189.                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
  1190.  
  1191.                 if (!drm_target_cloned(fb_helper,
  1192.                                        modes, enabled, width, height) &&
  1193.                     !drm_target_preferred(fb_helper,
  1194.                                           modes, enabled, width, height))
  1195.                         DRM_ERROR("Unable to find initial modes\n");
  1196.  
  1197.                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
  1198.                               width, height);
  1199.  
  1200.         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
  1201.         }
  1202.  
  1203.         /* need to set the modesets up here for use later */
  1204.         /* fill out the connector<->crtc mappings into the modesets */
  1205.         for (i = 0; i < fb_helper->crtc_count; i++) {
  1206.                 modeset = &fb_helper->crtc_info[i].mode_set;
  1207.                 modeset->num_connectors = 0;
  1208.                 modeset->fb = NULL;
  1209.         }
  1210.  
  1211.         for (i = 0; i < fb_helper->connector_count; i++) {
  1212.                 struct drm_display_mode *mode = modes[i];
  1213.                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
  1214.                 modeset = &fb_crtc->mode_set;
  1215.  
  1216.                 if (mode && fb_crtc) {
  1217.                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
  1218.                                       mode->name, fb_crtc->mode_set.crtc->base.id);
  1219.                         fb_crtc->desired_mode = mode;
  1220.                         if (modeset->mode)
  1221.                                 drm_mode_destroy(dev, modeset->mode);
  1222.                         modeset->mode = drm_mode_duplicate(dev,
  1223.                                                            fb_crtc->desired_mode);
  1224.                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
  1225.                         modeset->fb = fb_helper->fb;
  1226.                 }
  1227.         }
  1228.  
  1229.         /* Clear out any old modes if there are no more connected outputs. */
  1230.         for (i = 0; i < fb_helper->crtc_count; i++) {
  1231.                 modeset = &fb_helper->crtc_info[i].mode_set;
  1232.                 if (modeset->num_connectors == 0) {
  1233.                         BUG_ON(modeset->fb);
  1234.                         BUG_ON(modeset->num_connectors);
  1235.                         if (modeset->mode)
  1236.                                 drm_mode_destroy(dev, modeset->mode);
  1237.                         modeset->mode = NULL;
  1238.                 }
  1239.         }
  1240. out:
  1241.         kfree(crtcs);
  1242.         kfree(modes);
  1243.         kfree(enabled);
  1244. }
  1245.  
  1246. /**
  1247.  * drm_fb_helper_initial_config - setup a sane initial connector configuration
  1248.  * @fb_helper: fb_helper device struct
  1249.  * @bpp_sel: bpp value to use for the framebuffer configuration
  1250.  *
  1251.  * Scans the CRTCs and connectors and tries to put together an initial setup.
  1252.  * At the moment, this is a cloned configuration across all heads with
  1253.  * a new framebuffer object as the backing store.
  1254.  *
  1255.  * Note that this also registers the fbdev and so allows userspace to call into
  1256.  * the driver through the fbdev interfaces.
  1257.  *
  1258.  * This function will call down into the ->fb_probe callback to let
  1259.  * the driver allocate and initialize the fbdev info structure and the drm
  1260.  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
  1261.  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
  1262.  * values for the fbdev info structure.
  1263.  *
  1264.  * RETURNS:
  1265.  * Zero if everything went ok, nonzero otherwise.
  1266.  */
  1267. bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
  1268. {
  1269.         struct drm_device *dev = fb_helper->dev;
  1270.         int count = 0;
  1271.  
  1272. //   drm_fb_helper_parse_command_line(fb_helper);
  1273.  
  1274.         count = drm_fb_helper_probe_connector_modes(fb_helper,
  1275.                                                     dev->mode_config.max_width,
  1276.                                                     dev->mode_config.max_height);
  1277.         /*
  1278.          * we shouldn't end up with no modes here.
  1279.          */
  1280.         if (count == 0)
  1281.                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
  1282.  
  1283.         drm_setup_crtcs(fb_helper);
  1284.  
  1285.         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
  1286. }
  1287. EXPORT_SYMBOL(drm_fb_helper_initial_config);
  1288.  
  1289. /**
  1290.  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
  1291.  *                               probing all the outputs attached to the fb
  1292.  * @fb_helper: the drm_fb_helper
  1293.  *
  1294.  * Scan the connectors attached to the fb_helper and try to put together a
  1295.  * setup after *notification of a change in output configuration.
  1296.  *
  1297.  * Called at runtime, takes the mode config locks to be able to check/change the
  1298.  * modeset configuration. Must be run from process context (which usually means
  1299.  * either the output polling work or a work item launched from the driver's
  1300.  * hotplug interrupt).
  1301.  *
  1302.  * Note that the driver must ensure that this is only called _after_ the fb has
  1303.  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
  1304.  *
  1305.  * RETURNS:
  1306.  * 0 on success and a non-zero error code otherwise.
  1307.  */
  1308. int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
  1309. {
  1310.         struct drm_device *dev = fb_helper->dev;
  1311.         int count = 0;
  1312.         u32 max_width, max_height, bpp_sel;
  1313.  
  1314.         if (!fb_helper->fb)
  1315.                 return 0;
  1316.  
  1317.         mutex_lock(&fb_helper->dev->mode_config.mutex);
  1318.         if (!drm_fb_helper_is_bound(fb_helper)) {
  1319.                 fb_helper->delayed_hotplug = true;
  1320.                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
  1321.                 return 0;
  1322.         }
  1323.         DRM_DEBUG_KMS("\n");
  1324.  
  1325.         max_width = fb_helper->fb->width;
  1326.         max_height = fb_helper->fb->height;
  1327.         bpp_sel = fb_helper->fb->bits_per_pixel;
  1328.  
  1329.         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
  1330.                                                     max_height);
  1331.         mutex_unlock(&fb_helper->dev->mode_config.mutex);
  1332.  
  1333.         drm_modeset_lock_all(dev);
  1334.         drm_setup_crtcs(fb_helper);
  1335.         drm_modeset_unlock_all(dev);
  1336.         drm_fb_helper_set_par(fb_helper->fbdev);
  1337.  
  1338.         return 0;
  1339. }
  1340. EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
  1341.  
  1342.  
  1343.  
  1344.