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Rev | Author | Line No. | Line |
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5060 | serge | 1 | /* |
2 | * Copyright (c) 2006-2008 Intel Corporation |
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3 | * Copyright (c) 2007 Dave Airlie |
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4 | * |
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5 | * DRM core CRTC related functions |
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6 | * |
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7 | * Permission to use, copy, modify, distribute, and sell this software and its |
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8 | * documentation for any purpose is hereby granted without fee, provided that |
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9 | * the above copyright notice appear in all copies and that both that copyright |
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10 | * notice and this permission notice appear in supporting documentation, and |
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11 | * that the name of the copyright holders not be used in advertising or |
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12 | * publicity pertaining to distribution of the software without specific, |
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13 | * written prior permission. The copyright holders make no representations |
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14 | * about the suitability of this software for any purpose. It is provided "as |
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15 | * is" without express or implied warranty. |
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16 | * |
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17 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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18 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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19 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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20 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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21 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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22 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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23 | * OF THIS SOFTWARE. |
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24 | * |
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25 | * Authors: |
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26 | * Keith Packard |
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27 | * Eric Anholt |
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28 | * Dave Airlie |
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29 | * Jesse Barnes |
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30 | */ |
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31 | |||
32 | #include |
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33 | #include |
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34 | |||
35 | #include |
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36 | #include |
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37 | #include |
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38 | #include |
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39 | #include |
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40 | #include |
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41 | |||
42 | /** |
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43 | * DOC: output probing helper overview |
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44 | * |
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45 | * This library provides some helper code for output probing. It provides an |
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46 | * implementation of the core connector->fill_modes interface with |
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47 | * drm_helper_probe_single_connector_modes. |
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48 | * |
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49 | * It also provides support for polling connectors with a work item and for |
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50 | * generic hotplug interrupt handling where the driver doesn't or cannot keep |
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51 | * track of a per-connector hpd interrupt. |
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52 | * |
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53 | * This helper library can be used independently of the modeset helper library. |
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54 | * Drivers can also overwrite different parts e.g. use their own hotplug |
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55 | * handling code to avoid probing unrelated outputs. |
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6937 | serge | 56 | * |
57 | * The probe helpers share the function table structures with other display |
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58 | * helper libraries. See struct &drm_connector_helper_funcs for the details. |
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5060 | serge | 59 | */ |
60 | |||
61 | static bool drm_kms_helper_poll = true; |
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62 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); |
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63 | |||
6084 | serge | 64 | static enum drm_mode_status |
65 | drm_mode_validate_flag(const struct drm_display_mode *mode, |
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66 | int flags) |
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5060 | serge | 67 | { |
6084 | serge | 68 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
69 | !(flags & DRM_MODE_FLAG_INTERLACE)) |
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70 | return MODE_NO_INTERLACE; |
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71 | |||
72 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
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73 | !(flags & DRM_MODE_FLAG_DBLSCAN)) |
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74 | return MODE_NO_DBLESCAN; |
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75 | |||
76 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
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77 | !(flags & DRM_MODE_FLAG_3D_MASK)) |
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78 | return MODE_NO_STEREO; |
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79 | |||
80 | return MODE_OK; |
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81 | } |
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82 | |||
83 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
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84 | { |
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5060 | serge | 85 | struct drm_display_mode *mode; |
86 | |||
6084 | serge | 87 | if (!connector->cmdline_mode.specified) |
88 | return 0; |
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89 | |||
90 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
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91 | &connector->cmdline_mode); |
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92 | if (mode == NULL) |
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93 | return 0; |
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94 | |||
95 | drm_mode_probed_add(connector, mode); |
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96 | return 1; |
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97 | } |
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98 | |||
99 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
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100 | /** |
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101 | * drm_kms_helper_poll_enable_locked - re-enable output polling. |
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102 | * @dev: drm_device |
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103 | * |
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104 | * This function re-enables the output polling work without |
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105 | * locking the mode_config mutex. |
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106 | * |
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107 | * This is like drm_kms_helper_poll_enable() however it is to be |
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108 | * called from a context where the mode_config mutex is locked |
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109 | * already. |
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110 | */ |
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111 | void drm_kms_helper_poll_enable_locked(struct drm_device *dev) |
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112 | { |
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113 | bool poll = false; |
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114 | struct drm_connector *connector; |
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115 | |||
116 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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117 | |||
118 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
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5060 | serge | 119 | return; |
120 | |||
6084 | serge | 121 | drm_for_each_connector(connector, dev) { |
122 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
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123 | DRM_CONNECTOR_POLL_DISCONNECT)) |
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124 | poll = true; |
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5060 | serge | 125 | } |
126 | |||
6296 | serge | 127 | if (poll) |
128 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); |
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5060 | serge | 129 | } |
6084 | serge | 130 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
5060 | serge | 131 | |
6937 | serge | 132 | /** |
133 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
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134 | * @connector: connector to probe |
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135 | * @maxX: max width for modes |
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136 | * @maxY: max height for modes |
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137 | * |
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138 | * Based on the helper callbacks implemented by @connector in struct |
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139 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first |
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140 | * be added to the connector's probed_modes list, then culled (based on validity |
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141 | * and the @maxX, @maxY parameters) and put into the normal modes list. |
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142 | * |
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143 | * Intended to be used as a generic implementation of the ->fill_modes() |
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144 | * @connector vfunc for drivers that use the CRTC helpers for output mode |
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145 | * filtering and detection. |
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146 | * |
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147 | * The basic procedure is as follows |
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148 | * |
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149 | * 1. All modes currently on the connector's modes list are marked as stale |
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150 | * |
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151 | * 2. New modes are added to the connector's probed_modes list with |
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152 | * drm_mode_probed_add(). New modes start their life with status as OK. |
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153 | * Modes are added from a single source using the following priority order. |
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154 | * |
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155 | * - debugfs 'override_edid' (used for testing only) |
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156 | * - firmware EDID (drm_load_edid_firmware()) |
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157 | * - connector helper ->get_modes() vfunc |
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158 | * - if the connector status is connector_status_connected, standard |
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159 | * VESA DMT modes up to 1024x768 are automatically added |
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160 | * (drm_add_modes_noedid()) |
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161 | * |
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162 | * Finally modes specified via the kernel command line (video=...) are |
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163 | * added in addition to what the earlier probes produced |
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164 | * (drm_helper_probe_add_cmdline_mode()). These modes are generated |
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165 | * using the VESA GTF/CVT formulas. |
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166 | * |
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167 | * 3. Modes are moved from the probed_modes list to the modes list. Potential |
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168 | * duplicates are merged together (see drm_mode_connector_list_update()). |
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169 | * After this step the probed_modes list will be empty again. |
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170 | * |
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171 | * 4. Any non-stale mode on the modes list then undergoes validation |
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172 | * |
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173 | * - drm_mode_validate_basic() performs basic sanity checks |
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174 | * - drm_mode_validate_size() filters out modes larger than @maxX and @maxY |
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175 | * (if specified) |
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176 | * - drm_mode_validate_flag() checks the modes againt basic connector |
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177 | * capabilites (interlace_allowed,doublescan_allowed,stereo_allowed) |
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178 | * - the optional connector ->mode_valid() helper can perform driver and/or |
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179 | * hardware specific checks |
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180 | * |
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181 | * 5. Any mode whose status is not OK is pruned from the connector's modes list, |
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182 | * accompanied by a debug message indicating the reason for the mode's |
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183 | * rejection (see drm_mode_prune_invalid()). |
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184 | * |
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185 | * Returns: |
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186 | * The number of modes found on @connector. |
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187 | */ |
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188 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
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189 | uint32_t maxX, uint32_t maxY) |
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5060 | serge | 190 | { |
191 | struct drm_device *dev = connector->dev; |
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192 | struct drm_display_mode *mode; |
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6084 | serge | 193 | const struct drm_connector_helper_funcs *connector_funcs = |
5060 | serge | 194 | connector->helper_private; |
195 | int count = 0; |
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196 | int mode_flags = 0; |
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197 | bool verbose_prune = true; |
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6084 | serge | 198 | enum drm_connector_status old_status; |
5060 | serge | 199 | |
200 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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201 | |||
202 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
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203 | connector->name); |
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6937 | serge | 204 | /* set all old modes to the stale state */ |
5060 | serge | 205 | list_for_each_entry(mode, &connector->modes, head) |
6937 | serge | 206 | mode->status = MODE_STALE; |
5060 | serge | 207 | |
6937 | serge | 208 | old_status = connector->status; |
209 | |||
5060 | serge | 210 | if (connector->force) { |
5271 | serge | 211 | if (connector->force == DRM_FORCE_ON || |
212 | connector->force == DRM_FORCE_ON_DIGITAL) |
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5060 | serge | 213 | connector->status = connector_status_connected; |
214 | else |
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215 | connector->status = connector_status_disconnected; |
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216 | if (connector->funcs->force) |
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217 | connector->funcs->force(connector); |
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218 | } else { |
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219 | connector->status = connector->funcs->detect(connector, true); |
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6937 | serge | 220 | } |
6296 | serge | 221 | |
7144 | serge | 222 | /* |
223 | * Normally either the driver's hpd code or the poll loop should |
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224 | * pick up any changes and fire the hotplug event. But if |
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225 | * userspace sneaks in a probe, we might miss a change. Hence |
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226 | * check here, and if anything changed start the hotplug code. |
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227 | */ |
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228 | if (old_status != connector->status) { |
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6937 | serge | 229 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
7144 | serge | 230 | connector->base.id, |
231 | connector->name, |
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6937 | serge | 232 | drm_get_connector_status_name(old_status), |
233 | drm_get_connector_status_name(connector->status)); |
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6296 | serge | 234 | |
7144 | serge | 235 | /* |
236 | * The hotplug event code might call into the fb |
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237 | * helpers, and so expects that we do not hold any |
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238 | * locks. Fire up the poll struct instead, it will |
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239 | * disable itself again. |
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240 | */ |
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241 | dev->mode_config.delayed_event = true; |
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242 | if (dev->mode_config.poll_enabled) |
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243 | schedule_delayed_work(&dev->mode_config.output_poll_work, |
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244 | 0); |
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245 | } |
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5060 | serge | 246 | |
247 | /* Re-enable polling in case the global poll config changed. */ |
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248 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
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6084 | serge | 249 | drm_kms_helper_poll_enable_locked(dev); |
5060 | serge | 250 | |
251 | dev->mode_config.poll_running = drm_kms_helper_poll; |
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252 | |||
253 | if (connector->status == connector_status_disconnected) { |
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254 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
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255 | connector->base.id, connector->name); |
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256 | drm_mode_connector_update_edid_property(connector, NULL); |
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257 | verbose_prune = false; |
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258 | goto prune; |
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259 | } |
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260 | |||
7144 | serge | 261 | if (connector->override_edid) { |
262 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; |
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5060 | serge | 263 | |
7144 | serge | 264 | count = drm_add_edid_modes(connector, edid); |
265 | drm_edid_to_eld(connector, edid); |
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6937 | serge | 266 | } else { |
267 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
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268 | count = drm_load_edid_firmware(connector); |
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269 | if (count == 0) |
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270 | #endif |
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6084 | serge | 271 | count = (*connector_funcs->get_modes)(connector); |
5060 | serge | 272 | } |
273 | |||
274 | if (count == 0 && connector->status == connector_status_connected) |
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275 | count = drm_add_modes_noedid(connector, 1024, 768); |
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6088 | serge | 276 | count += drm_helper_probe_add_cmdline_mode(connector); |
5060 | serge | 277 | if (count == 0) |
278 | goto prune; |
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279 | |||
6937 | serge | 280 | drm_mode_connector_list_update(connector); |
5060 | serge | 281 | |
282 | if (connector->interlace_allowed) |
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283 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
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284 | if (connector->doublescan_allowed) |
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285 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
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286 | if (connector->stereo_allowed) |
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287 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
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288 | |||
289 | list_for_each_entry(mode, &connector->modes, head) { |
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6084 | serge | 290 | if (mode->status == MODE_OK) |
291 | mode->status = drm_mode_validate_basic(mode); |
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292 | |||
293 | if (mode->status == MODE_OK) |
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294 | mode->status = drm_mode_validate_size(mode, maxX, maxY); |
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295 | |||
296 | if (mode->status == MODE_OK) |
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297 | mode->status = drm_mode_validate_flag(mode, mode_flags); |
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298 | |||
5060 | serge | 299 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
300 | mode->status = connector_funcs->mode_valid(connector, |
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301 | mode); |
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302 | } |
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303 | |||
304 | prune: |
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305 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
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306 | |||
307 | if (list_empty(&connector->modes)) |
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308 | return 0; |
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309 | |||
310 | list_for_each_entry(mode, &connector->modes, head) |
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311 | mode->vrefresh = drm_mode_vrefresh(mode); |
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312 | |||
313 | drm_mode_sort(&connector->modes); |
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314 | |||
315 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
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316 | connector->name); |
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317 | list_for_each_entry(mode, &connector->modes, head) { |
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318 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
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319 | drm_mode_debug_printmodeline(mode); |
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320 | } |
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321 | |||
322 | return count; |
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323 | } |
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324 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
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325 | |||
326 | /** |
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327 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
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328 | * @dev: drm_device whose connector state changed |
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329 | * |
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330 | * This function fires off the uevent for userspace and also calls the |
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331 | * output_poll_changed function, which is most commonly used to inform the fbdev |
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332 | * emulation code and allow it to update the fbcon output configuration. |
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333 | * |
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334 | * Drivers should call this from their hotplug handling code when a change is |
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335 | * detected. Note that this function does not do any output detection of its |
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336 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
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337 | * driver already. |
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338 | * |
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339 | * This function must be called from process context with no mode |
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340 | * setting locks held. |
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341 | */ |
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342 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
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343 | { |
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7144 | serge | 344 | /* send a uevent + call fbdev */ |
6296 | serge | 345 | drm_sysfs_hotplug_event(dev); |
346 | if (dev->mode_config.funcs->output_poll_changed) |
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347 | dev->mode_config.funcs->output_poll_changed(dev); |
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5060 | serge | 348 | } |
349 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
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350 | |||
351 | static void output_poll_execute(struct work_struct *work) |
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352 | { |
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353 | struct delayed_work *delayed_work = to_delayed_work(work); |
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354 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
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355 | struct drm_connector *connector; |
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356 | enum drm_connector_status old_status; |
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6084 | serge | 357 | bool repoll = false, changed; |
5060 | serge | 358 | |
6084 | serge | 359 | /* Pick up any changes detected by the probe functions. */ |
360 | changed = dev->mode_config.delayed_event; |
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361 | dev->mode_config.delayed_event = false; |
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362 | |||
5060 | serge | 363 | if (!drm_kms_helper_poll) |
6084 | serge | 364 | goto out; |
5060 | serge | 365 | |
366 | mutex_lock(&dev->mode_config.mutex); |
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6084 | serge | 367 | drm_for_each_connector(connector, dev) { |
5060 | serge | 368 | |
369 | /* Ignore forced connectors. */ |
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370 | if (connector->force) |
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371 | continue; |
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372 | |||
373 | /* Ignore HPD capable connectors and connectors where we don't |
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374 | * want any hotplug detection at all for polling. */ |
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375 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
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376 | continue; |
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377 | |||
378 | old_status = connector->status; |
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379 | /* if we are connected and don't want to poll for disconnect |
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380 | skip it */ |
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381 | if (old_status == connector_status_connected && |
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382 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
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383 | continue; |
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384 | |||
6084 | serge | 385 | repoll = true; |
386 | |||
5060 | serge | 387 | connector->status = connector->funcs->detect(connector, false); |
388 | if (old_status != connector->status) { |
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389 | const char *old, *new; |
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390 | |||
6084 | serge | 391 | /* |
392 | * The poll work sets force=false when calling detect so |
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393 | * that drivers can avoid to do disruptive tests (e.g. |
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394 | * when load detect cycles could cause flickering on |
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395 | * other, running displays). This bears the risk that we |
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396 | * flip-flop between unknown here in the poll work and |
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397 | * the real state when userspace forces a full detect |
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398 | * call after receiving a hotplug event due to this |
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399 | * change. |
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400 | * |
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401 | * Hence clamp an unknown detect status to the old |
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402 | * value. |
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403 | */ |
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404 | if (connector->status == connector_status_unknown) { |
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405 | connector->status = old_status; |
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406 | continue; |
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407 | } |
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408 | |||
5060 | serge | 409 | old = drm_get_connector_status_name(old_status); |
410 | new = drm_get_connector_status_name(connector->status); |
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411 | |||
412 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
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413 | "status updated from %s to %s\n", |
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414 | connector->base.id, |
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415 | connector->name, |
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416 | old, new); |
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417 | |||
418 | changed = true; |
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419 | } |
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420 | } |
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421 | |||
422 | mutex_unlock(&dev->mode_config.mutex); |
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423 | |||
6296 | serge | 424 | out: |
425 | if (changed) |
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426 | drm_kms_helper_hotplug_event(dev); |
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6084 | serge | 427 | |
6296 | serge | 428 | if (repoll) |
429 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
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5060 | serge | 430 | } |
431 | |||
432 | /** |
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433 | * drm_kms_helper_poll_disable - disable output polling |
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434 | * @dev: drm_device |
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435 | * |
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436 | * This function disables the output polling work. |
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437 | * |
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438 | * Drivers can call this helper from their device suspend implementation. It is |
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439 | * not an error to call this even when output polling isn't enabled or arlready |
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440 | * disabled. |
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441 | */ |
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442 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
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443 | { |
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444 | if (!dev->mode_config.poll_enabled) |
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445 | return; |
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6296 | serge | 446 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
5060 | serge | 447 | } |
448 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
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449 | |||
450 | /** |
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451 | * drm_kms_helper_poll_enable - re-enable output polling. |
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452 | * @dev: drm_device |
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453 | * |
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454 | * This function re-enables the output polling work. |
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455 | * |
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456 | * Drivers can call this helper from their device resume implementation. It is |
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457 | * an error to call this when the output polling support has not yet been set |
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458 | * up. |
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459 | */ |
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460 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
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461 | { |
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6084 | serge | 462 | mutex_lock(&dev->mode_config.mutex); |
463 | drm_kms_helper_poll_enable_locked(dev); |
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464 | mutex_unlock(&dev->mode_config.mutex); |
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5060 | serge | 465 | } |
466 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
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467 | |||
468 | /** |
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469 | * drm_kms_helper_poll_init - initialize and enable output polling |
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470 | * @dev: drm_device |
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471 | * |
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472 | * This function intializes and then also enables output polling support for |
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473 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
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474 | * this helper infrastructure to regularly poll such connectors for changes in |
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475 | * their connection state. |
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476 | * |
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477 | * Drivers can control which connectors are polled by setting the |
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478 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
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479 | * connectors where probing live outputs can result in visual distortion drivers |
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480 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
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481 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
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482 | * completely ignored by the polling logic. |
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483 | * |
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484 | * Note that a connector can be both polled and probed from the hotplug handler, |
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485 | * in case the hotplug interrupt is known to be unreliable. |
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486 | */ |
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487 | void drm_kms_helper_poll_init(struct drm_device *dev) |
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488 | { |
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489 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
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490 | dev->mode_config.poll_enabled = true; |
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491 | |||
492 | drm_kms_helper_poll_enable(dev); |
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493 | } |
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494 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
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495 | |||
496 | /** |
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497 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
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498 | * @dev: drm_device |
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499 | */ |
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500 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
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501 | { |
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502 | drm_kms_helper_poll_disable(dev); |
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503 | } |
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504 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
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505 | |||
506 | /** |
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507 | * drm_helper_hpd_irq_event - hotplug processing |
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508 | * @dev: drm_device |
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509 | * |
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510 | * Drivers can use this helper function to run a detect cycle on all connectors |
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511 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
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512 | * other connectors are ignored, which is useful to avoid reprobing fixed |
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513 | * panels. |
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514 | * |
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515 | * This helper function is useful for drivers which can't or don't track hotplug |
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516 | * interrupts for each connector. |
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517 | * |
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518 | * Drivers which support hotplug interrupts for each connector individually and |
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519 | * which have a more fine-grained detect logic should bypass this code and |
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520 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
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521 | * changed. |
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522 | * |
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523 | * This function must be called from process context with no mode |
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524 | * setting locks held. |
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525 | * |
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526 | * Note that a connector can be both polled and probed from the hotplug handler, |
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527 | * in case the hotplug interrupt is known to be unreliable. |
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528 | */ |
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529 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
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530 | { |
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531 | struct drm_connector *connector; |
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532 | enum drm_connector_status old_status; |
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533 | bool changed = false; |
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534 | |||
535 | if (!dev->mode_config.poll_enabled) |
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536 | return false; |
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537 | |||
538 | mutex_lock(&dev->mode_config.mutex); |
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6084 | serge | 539 | drm_for_each_connector(connector, dev) { |
5060 | serge | 540 | |
541 | /* Only handle HPD capable connectors. */ |
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542 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
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543 | continue; |
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544 | |||
545 | old_status = connector->status; |
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546 | |||
547 | connector->status = connector->funcs->detect(connector, false); |
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548 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
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549 | connector->base.id, |
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550 | connector->name, |
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551 | drm_get_connector_status_name(old_status), |
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552 | drm_get_connector_status_name(connector->status)); |
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553 | if (old_status != connector->status) |
||
554 | changed = true; |
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555 | } |
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556 | |||
557 | mutex_unlock(&dev->mode_config.mutex); |
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558 | |||
559 | if (changed) |
||
560 | drm_kms_helper_hotplug_event(dev); |
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561 | |||
562 | return changed; |
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563 | } |
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564 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |