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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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56 | */ |
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57 | |||
58 | static bool drm_kms_helper_poll = true; |
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59 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); |
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60 | |||
61 | static void drm_mode_validate_flag(struct drm_connector *connector, |
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62 | int flags) |
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63 | { |
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64 | struct drm_display_mode *mode; |
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65 | |||
66 | if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE | |
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67 | DRM_MODE_FLAG_3D_MASK)) |
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68 | return; |
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69 | |||
70 | list_for_each_entry(mode, &connector->modes, head) { |
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71 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
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72 | !(flags & DRM_MODE_FLAG_INTERLACE)) |
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73 | mode->status = MODE_NO_INTERLACE; |
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74 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
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75 | !(flags & DRM_MODE_FLAG_DBLSCAN)) |
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76 | mode->status = MODE_NO_DBLESCAN; |
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77 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
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78 | !(flags & DRM_MODE_FLAG_3D_MASK)) |
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79 | mode->status = MODE_NO_STEREO; |
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80 | } |
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81 | |||
82 | return; |
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83 | } |
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84 | |||
85 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
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86 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) |
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87 | { |
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88 | struct drm_device *dev = connector->dev; |
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89 | struct drm_display_mode *mode; |
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90 | struct drm_connector_helper_funcs *connector_funcs = |
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91 | connector->helper_private; |
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92 | int count = 0; |
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93 | int mode_flags = 0; |
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94 | bool verbose_prune = true; |
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95 | |||
96 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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97 | |||
98 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
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99 | connector->name); |
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100 | /* set all modes to the unverified state */ |
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101 | list_for_each_entry(mode, &connector->modes, head) |
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102 | mode->status = MODE_UNVERIFIED; |
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103 | |||
104 | if (connector->force) { |
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5271 | serge | 105 | if (connector->force == DRM_FORCE_ON || |
106 | connector->force == DRM_FORCE_ON_DIGITAL) |
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5060 | serge | 107 | connector->status = connector_status_connected; |
108 | else |
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109 | connector->status = connector_status_disconnected; |
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110 | if (connector->funcs->force) |
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111 | connector->funcs->force(connector); |
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112 | } else { |
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113 | connector->status = connector->funcs->detect(connector, true); |
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114 | } |
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115 | |||
116 | /* Re-enable polling in case the global poll config changed. */ |
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117 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
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118 | drm_kms_helper_poll_enable(dev); |
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119 | |||
120 | dev->mode_config.poll_running = drm_kms_helper_poll; |
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121 | |||
122 | if (connector->status == connector_status_disconnected) { |
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123 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
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124 | connector->base.id, connector->name); |
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125 | drm_mode_connector_update_edid_property(connector, NULL); |
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126 | verbose_prune = false; |
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127 | goto prune; |
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128 | } |
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129 | |||
130 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
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131 | count = drm_load_edid_firmware(connector); |
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132 | if (count == 0) |
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133 | #endif |
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134 | { |
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135 | if (connector->override_edid) { |
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136 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; |
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137 | |||
138 | count = drm_add_edid_modes(connector, edid); |
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139 | } else |
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140 | count = (*connector_funcs->get_modes)(connector); |
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141 | } |
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142 | |||
143 | if (count == 0 && connector->status == connector_status_connected) |
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144 | count = drm_add_modes_noedid(connector, 1024, 768); |
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145 | if (count == 0) |
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146 | goto prune; |
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147 | |||
148 | drm_mode_connector_list_update(connector, merge_type_bits); |
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149 | |||
150 | if (maxX && maxY) |
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151 | drm_mode_validate_size(dev, &connector->modes, maxX, maxY); |
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152 | |||
153 | if (connector->interlace_allowed) |
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154 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
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155 | if (connector->doublescan_allowed) |
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156 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
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157 | if (connector->stereo_allowed) |
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158 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
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159 | drm_mode_validate_flag(connector, mode_flags); |
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160 | |||
161 | list_for_each_entry(mode, &connector->modes, head) { |
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162 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
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163 | mode->status = connector_funcs->mode_valid(connector, |
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164 | mode); |
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165 | } |
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166 | |||
167 | prune: |
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168 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
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169 | |||
170 | if (list_empty(&connector->modes)) |
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171 | return 0; |
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172 | |||
173 | list_for_each_entry(mode, &connector->modes, head) |
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174 | mode->vrefresh = drm_mode_vrefresh(mode); |
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175 | |||
176 | drm_mode_sort(&connector->modes); |
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177 | |||
178 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
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179 | connector->name); |
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180 | list_for_each_entry(mode, &connector->modes, head) { |
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181 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
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182 | drm_mode_debug_printmodeline(mode); |
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183 | } |
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184 | |||
185 | return count; |
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186 | } |
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187 | |||
188 | /** |
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189 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
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190 | * @connector: connector to probe |
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191 | * @maxX: max width for modes |
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192 | * @maxY: max height for modes |
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193 | * |
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194 | * Based on the helper callbacks implemented by @connector try to detect all |
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195 | * valid modes. Modes will first be added to the connector's probed_modes list, |
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196 | * then culled (based on validity and the @maxX, @maxY parameters) and put into |
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197 | * the normal modes list. |
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198 | * |
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199 | * Intended to be use as a generic implementation of the ->fill_modes() |
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200 | * @connector vfunc for drivers that use the crtc helpers for output mode |
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201 | * filtering and detection. |
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202 | * |
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203 | * Returns: |
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204 | * The number of modes found on @connector. |
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205 | */ |
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206 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
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207 | uint32_t maxX, uint32_t maxY) |
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208 | { |
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209 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); |
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210 | } |
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211 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
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212 | |||
213 | /** |
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214 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes |
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215 | * @connector: connector to probe |
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216 | * @maxX: max width for modes |
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217 | * @maxY: max height for modes |
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218 | * |
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219 | * This operates like drm_hehlper_probe_single_connector_modes except it |
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220 | * replaces the mode bits instead of merging them for preferred modes. |
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221 | */ |
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222 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, |
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223 | uint32_t maxX, uint32_t maxY) |
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224 | { |
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225 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); |
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226 | } |
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227 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); |
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228 | |||
229 | /** |
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230 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
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231 | * @dev: drm_device whose connector state changed |
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232 | * |
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233 | * This function fires off the uevent for userspace and also calls the |
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234 | * output_poll_changed function, which is most commonly used to inform the fbdev |
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235 | * emulation code and allow it to update the fbcon output configuration. |
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236 | * |
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237 | * Drivers should call this from their hotplug handling code when a change is |
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238 | * detected. Note that this function does not do any output detection of its |
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239 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
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240 | * driver already. |
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241 | * |
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242 | * This function must be called from process context with no mode |
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243 | * setting locks held. |
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244 | */ |
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245 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
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246 | { |
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247 | /* send a uevent + call fbdev */ |
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248 | // drm_sysfs_hotplug_event(dev); |
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249 | // if (dev->mode_config.funcs->output_poll_changed) |
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250 | // dev->mode_config.funcs->output_poll_changed(dev); |
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251 | } |
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252 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
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253 | |||
254 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
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255 | static void output_poll_execute(struct work_struct *work) |
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256 | { |
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257 | struct delayed_work *delayed_work = to_delayed_work(work); |
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258 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
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259 | struct drm_connector *connector; |
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260 | enum drm_connector_status old_status; |
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261 | bool repoll = false, changed = false; |
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262 | |||
263 | if (!drm_kms_helper_poll) |
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264 | return; |
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265 | |||
266 | mutex_lock(&dev->mode_config.mutex); |
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267 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
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268 | |||
269 | /* Ignore forced connectors. */ |
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270 | if (connector->force) |
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271 | continue; |
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272 | |||
273 | /* Ignore HPD capable connectors and connectors where we don't |
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274 | * want any hotplug detection at all for polling. */ |
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275 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
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276 | continue; |
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277 | |||
278 | repoll = true; |
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279 | |||
280 | old_status = connector->status; |
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281 | /* if we are connected and don't want to poll for disconnect |
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282 | skip it */ |
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283 | if (old_status == connector_status_connected && |
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284 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
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285 | continue; |
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286 | |||
287 | connector->status = connector->funcs->detect(connector, false); |
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288 | if (old_status != connector->status) { |
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289 | const char *old, *new; |
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290 | |||
291 | old = drm_get_connector_status_name(old_status); |
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292 | new = drm_get_connector_status_name(connector->status); |
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293 | |||
294 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
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295 | "status updated from %s to %s\n", |
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296 | connector->base.id, |
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297 | connector->name, |
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298 | old, new); |
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299 | |||
300 | changed = true; |
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301 | } |
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302 | } |
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303 | |||
304 | mutex_unlock(&dev->mode_config.mutex); |
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305 | |||
306 | // if (changed) |
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307 | // drm_kms_helper_hotplug_event(dev); |
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308 | |||
309 | // if (repoll) |
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310 | // schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
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311 | } |
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312 | |||
313 | /** |
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314 | * drm_kms_helper_poll_disable - disable output polling |
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315 | * @dev: drm_device |
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316 | * |
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317 | * This function disables the output polling work. |
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318 | * |
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319 | * Drivers can call this helper from their device suspend implementation. It is |
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320 | * not an error to call this even when output polling isn't enabled or arlready |
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321 | * disabled. |
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322 | */ |
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323 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
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324 | { |
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325 | if (!dev->mode_config.poll_enabled) |
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326 | return; |
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327 | // cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
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328 | } |
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329 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
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330 | |||
331 | /** |
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332 | * drm_kms_helper_poll_enable - re-enable output polling. |
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333 | * @dev: drm_device |
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334 | * |
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335 | * This function re-enables the output polling work. |
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336 | * |
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337 | * Drivers can call this helper from their device resume implementation. It is |
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338 | * an error to call this when the output polling support has not yet been set |
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339 | * up. |
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340 | */ |
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341 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
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342 | { |
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343 | bool poll = false; |
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344 | struct drm_connector *connector; |
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345 | |||
346 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
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347 | return; |
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348 | |||
349 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
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350 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
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351 | DRM_CONNECTOR_POLL_DISCONNECT)) |
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352 | poll = true; |
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353 | } |
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354 | |||
355 | // if (poll) |
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356 | // schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); |
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357 | } |
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358 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
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359 | |||
360 | /** |
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361 | * drm_kms_helper_poll_init - initialize and enable output polling |
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362 | * @dev: drm_device |
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363 | * |
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364 | * This function intializes and then also enables output polling support for |
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365 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
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366 | * this helper infrastructure to regularly poll such connectors for changes in |
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367 | * their connection state. |
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368 | * |
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369 | * Drivers can control which connectors are polled by setting the |
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370 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
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371 | * connectors where probing live outputs can result in visual distortion drivers |
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372 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
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373 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
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374 | * completely ignored by the polling logic. |
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375 | * |
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376 | * Note that a connector can be both polled and probed from the hotplug handler, |
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377 | * in case the hotplug interrupt is known to be unreliable. |
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378 | */ |
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379 | void drm_kms_helper_poll_init(struct drm_device *dev) |
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380 | { |
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381 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
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382 | dev->mode_config.poll_enabled = true; |
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383 | |||
384 | drm_kms_helper_poll_enable(dev); |
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385 | } |
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386 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
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387 | |||
388 | /** |
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389 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
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390 | * @dev: drm_device |
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391 | */ |
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392 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
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393 | { |
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394 | drm_kms_helper_poll_disable(dev); |
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395 | } |
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396 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
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397 | |||
398 | /** |
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399 | * drm_helper_hpd_irq_event - hotplug processing |
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400 | * @dev: drm_device |
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401 | * |
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402 | * Drivers can use this helper function to run a detect cycle on all connectors |
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403 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
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404 | * other connectors are ignored, which is useful to avoid reprobing fixed |
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405 | * panels. |
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406 | * |
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407 | * This helper function is useful for drivers which can't or don't track hotplug |
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408 | * interrupts for each connector. |
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409 | * |
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410 | * Drivers which support hotplug interrupts for each connector individually and |
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411 | * which have a more fine-grained detect logic should bypass this code and |
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412 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
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413 | * changed. |
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414 | * |
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415 | * This function must be called from process context with no mode |
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416 | * setting locks held. |
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417 | * |
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418 | * Note that a connector can be both polled and probed from the hotplug handler, |
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419 | * in case the hotplug interrupt is known to be unreliable. |
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420 | */ |
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421 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
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422 | { |
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423 | struct drm_connector *connector; |
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424 | enum drm_connector_status old_status; |
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425 | bool changed = false; |
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426 | |||
427 | if (!dev->mode_config.poll_enabled) |
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428 | return false; |
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429 | |||
430 | mutex_lock(&dev->mode_config.mutex); |
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431 | list_for_each_entry(connector, &dev->mode_config.connector_list, head) { |
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432 | |||
433 | /* Only handle HPD capable connectors. */ |
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434 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
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435 | continue; |
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436 | |||
437 | old_status = connector->status; |
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438 | |||
439 | connector->status = connector->funcs->detect(connector, false); |
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440 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
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441 | connector->base.id, |
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442 | connector->name, |
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443 | drm_get_connector_status_name(old_status), |
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444 | drm_get_connector_status_name(connector->status)); |
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445 | if (old_status != connector->status) |
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446 | changed = true; |
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447 | } |
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448 | |||
449 | mutex_unlock(&dev->mode_config.mutex); |
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450 | |||
451 | if (changed) |
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452 | drm_kms_helper_hotplug_event(dev); |
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453 | |||
454 | return changed; |
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455 | } |
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456 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |