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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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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 | |||
6084 | serge | 61 | static enum drm_mode_status |
62 | drm_mode_validate_flag(const struct drm_display_mode *mode, |
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63 | int flags) |
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5060 | serge | 64 | { |
6084 | serge | 65 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
66 | !(flags & DRM_MODE_FLAG_INTERLACE)) |
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67 | return MODE_NO_INTERLACE; |
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68 | |||
69 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
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70 | !(flags & DRM_MODE_FLAG_DBLSCAN)) |
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71 | return MODE_NO_DBLESCAN; |
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72 | |||
73 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
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74 | !(flags & DRM_MODE_FLAG_3D_MASK)) |
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75 | return MODE_NO_STEREO; |
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76 | |||
77 | return MODE_OK; |
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78 | } |
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79 | |||
80 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
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81 | { |
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5060 | serge | 82 | struct drm_display_mode *mode; |
83 | |||
6084 | serge | 84 | if (!connector->cmdline_mode.specified) |
85 | return 0; |
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86 | |||
87 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
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88 | &connector->cmdline_mode); |
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89 | if (mode == NULL) |
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90 | return 0; |
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91 | |||
92 | drm_mode_probed_add(connector, mode); |
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93 | return 1; |
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94 | } |
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95 | |||
96 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
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97 | /** |
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98 | * drm_kms_helper_poll_enable_locked - re-enable output polling. |
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99 | * @dev: drm_device |
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100 | * |
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101 | * This function re-enables the output polling work without |
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102 | * locking the mode_config mutex. |
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103 | * |
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104 | * This is like drm_kms_helper_poll_enable() however it is to be |
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105 | * called from a context where the mode_config mutex is locked |
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106 | * already. |
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107 | */ |
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108 | void drm_kms_helper_poll_enable_locked(struct drm_device *dev) |
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109 | { |
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110 | bool poll = false; |
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111 | struct drm_connector *connector; |
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112 | |||
113 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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114 | |||
115 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
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5060 | serge | 116 | return; |
117 | |||
6084 | serge | 118 | drm_for_each_connector(connector, dev) { |
119 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
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120 | DRM_CONNECTOR_POLL_DISCONNECT)) |
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121 | poll = true; |
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5060 | serge | 122 | } |
123 | |||
124 | } |
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6084 | serge | 125 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
5060 | serge | 126 | |
6084 | serge | 127 | |
5060 | serge | 128 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
129 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) |
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130 | { |
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131 | struct drm_device *dev = connector->dev; |
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132 | struct drm_display_mode *mode; |
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6084 | serge | 133 | const struct drm_connector_helper_funcs *connector_funcs = |
5060 | serge | 134 | connector->helper_private; |
135 | int count = 0; |
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136 | int mode_flags = 0; |
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137 | bool verbose_prune = true; |
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6084 | serge | 138 | enum drm_connector_status old_status; |
5060 | serge | 139 | |
140 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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141 | |||
142 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
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143 | connector->name); |
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144 | /* set all modes to the unverified state */ |
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145 | list_for_each_entry(mode, &connector->modes, head) |
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146 | mode->status = MODE_UNVERIFIED; |
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147 | |||
148 | if (connector->force) { |
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5271 | serge | 149 | if (connector->force == DRM_FORCE_ON || |
150 | connector->force == DRM_FORCE_ON_DIGITAL) |
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5060 | serge | 151 | connector->status = connector_status_connected; |
152 | else |
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153 | connector->status = connector_status_disconnected; |
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154 | if (connector->funcs->force) |
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155 | connector->funcs->force(connector); |
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156 | } else { |
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6084 | serge | 157 | old_status = connector->status; |
158 | |||
5060 | serge | 159 | connector->status = connector->funcs->detect(connector, true); |
160 | } |
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161 | |||
162 | /* Re-enable polling in case the global poll config changed. */ |
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163 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
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6084 | serge | 164 | drm_kms_helper_poll_enable_locked(dev); |
5060 | serge | 165 | |
166 | dev->mode_config.poll_running = drm_kms_helper_poll; |
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167 | |||
168 | if (connector->status == connector_status_disconnected) { |
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169 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
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170 | connector->base.id, connector->name); |
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171 | drm_mode_connector_update_edid_property(connector, NULL); |
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172 | verbose_prune = false; |
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173 | goto prune; |
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174 | } |
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175 | |||
176 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
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177 | count = drm_load_edid_firmware(connector); |
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178 | if (count == 0) |
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179 | #endif |
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180 | { |
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181 | if (connector->override_edid) { |
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182 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; |
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183 | |||
184 | count = drm_add_edid_modes(connector, edid); |
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6084 | serge | 185 | drm_edid_to_eld(connector, edid); |
5060 | serge | 186 | } else |
6084 | serge | 187 | count = (*connector_funcs->get_modes)(connector); |
5060 | serge | 188 | } |
189 | |||
190 | if (count == 0 && connector->status == connector_status_connected) |
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191 | count = drm_add_modes_noedid(connector, 1024, 768); |
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6088 | serge | 192 | count += drm_helper_probe_add_cmdline_mode(connector); |
5060 | serge | 193 | if (count == 0) |
194 | goto prune; |
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195 | |||
196 | drm_mode_connector_list_update(connector, merge_type_bits); |
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197 | |||
198 | if (connector->interlace_allowed) |
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199 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
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200 | if (connector->doublescan_allowed) |
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201 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
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202 | if (connector->stereo_allowed) |
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203 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
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204 | |||
205 | list_for_each_entry(mode, &connector->modes, head) { |
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6084 | serge | 206 | if (mode->status == MODE_OK) |
207 | mode->status = drm_mode_validate_basic(mode); |
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208 | |||
209 | if (mode->status == MODE_OK) |
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210 | mode->status = drm_mode_validate_size(mode, maxX, maxY); |
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211 | |||
212 | if (mode->status == MODE_OK) |
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213 | mode->status = drm_mode_validate_flag(mode, mode_flags); |
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214 | |||
5060 | serge | 215 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
216 | mode->status = connector_funcs->mode_valid(connector, |
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217 | mode); |
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218 | } |
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219 | |||
220 | prune: |
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221 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
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222 | |||
223 | if (list_empty(&connector->modes)) |
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224 | return 0; |
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225 | |||
226 | list_for_each_entry(mode, &connector->modes, head) |
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227 | mode->vrefresh = drm_mode_vrefresh(mode); |
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228 | |||
229 | drm_mode_sort(&connector->modes); |
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230 | |||
231 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
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232 | connector->name); |
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233 | list_for_each_entry(mode, &connector->modes, head) { |
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234 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
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235 | drm_mode_debug_printmodeline(mode); |
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236 | } |
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237 | |||
238 | return count; |
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239 | } |
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240 | |||
241 | /** |
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242 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
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243 | * @connector: connector to probe |
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244 | * @maxX: max width for modes |
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245 | * @maxY: max height for modes |
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246 | * |
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247 | * Based on the helper callbacks implemented by @connector try to detect all |
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248 | * valid modes. Modes will first be added to the connector's probed_modes list, |
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249 | * then culled (based on validity and the @maxX, @maxY parameters) and put into |
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250 | * the normal modes list. |
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251 | * |
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252 | * Intended to be use as a generic implementation of the ->fill_modes() |
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253 | * @connector vfunc for drivers that use the crtc helpers for output mode |
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254 | * filtering and detection. |
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255 | * |
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256 | * Returns: |
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257 | * The number of modes found on @connector. |
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258 | */ |
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259 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
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260 | uint32_t maxX, uint32_t maxY) |
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261 | { |
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262 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); |
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263 | } |
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264 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
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265 | |||
266 | /** |
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267 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes |
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268 | * @connector: connector to probe |
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269 | * @maxX: max width for modes |
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270 | * @maxY: max height for modes |
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271 | * |
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272 | * This operates like drm_hehlper_probe_single_connector_modes except it |
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273 | * replaces the mode bits instead of merging them for preferred modes. |
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274 | */ |
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275 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, |
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276 | uint32_t maxX, uint32_t maxY) |
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277 | { |
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278 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); |
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279 | } |
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280 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); |
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281 | |||
282 | /** |
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283 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
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284 | * @dev: drm_device whose connector state changed |
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285 | * |
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286 | * This function fires off the uevent for userspace and also calls the |
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287 | * output_poll_changed function, which is most commonly used to inform the fbdev |
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288 | * emulation code and allow it to update the fbcon output configuration. |
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289 | * |
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290 | * Drivers should call this from their hotplug handling code when a change is |
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291 | * detected. Note that this function does not do any output detection of its |
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292 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
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293 | * driver already. |
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294 | * |
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295 | * This function must be called from process context with no mode |
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296 | * setting locks held. |
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297 | */ |
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298 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
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299 | { |
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300 | /* send a uevent + call fbdev */ |
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301 | // drm_sysfs_hotplug_event(dev); |
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302 | // if (dev->mode_config.funcs->output_poll_changed) |
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303 | // dev->mode_config.funcs->output_poll_changed(dev); |
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304 | } |
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305 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
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306 | |||
307 | static void output_poll_execute(struct work_struct *work) |
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308 | { |
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309 | struct delayed_work *delayed_work = to_delayed_work(work); |
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310 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
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311 | struct drm_connector *connector; |
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312 | enum drm_connector_status old_status; |
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6084 | serge | 313 | bool repoll = false, changed; |
5060 | serge | 314 | |
6084 | serge | 315 | /* Pick up any changes detected by the probe functions. */ |
316 | changed = dev->mode_config.delayed_event; |
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317 | dev->mode_config.delayed_event = false; |
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318 | |||
5060 | serge | 319 | if (!drm_kms_helper_poll) |
6084 | serge | 320 | goto out; |
5060 | serge | 321 | |
322 | mutex_lock(&dev->mode_config.mutex); |
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6084 | serge | 323 | drm_for_each_connector(connector, dev) { |
5060 | serge | 324 | |
325 | /* Ignore forced connectors. */ |
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326 | if (connector->force) |
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327 | continue; |
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328 | |||
329 | /* Ignore HPD capable connectors and connectors where we don't |
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330 | * want any hotplug detection at all for polling. */ |
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331 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
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332 | continue; |
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333 | |||
334 | old_status = connector->status; |
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335 | /* if we are connected and don't want to poll for disconnect |
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336 | skip it */ |
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337 | if (old_status == connector_status_connected && |
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338 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
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339 | continue; |
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340 | |||
6084 | serge | 341 | repoll = true; |
342 | |||
5060 | serge | 343 | connector->status = connector->funcs->detect(connector, false); |
344 | if (old_status != connector->status) { |
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345 | const char *old, *new; |
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346 | |||
6084 | serge | 347 | /* |
348 | * The poll work sets force=false when calling detect so |
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349 | * that drivers can avoid to do disruptive tests (e.g. |
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350 | * when load detect cycles could cause flickering on |
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351 | * other, running displays). This bears the risk that we |
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352 | * flip-flop between unknown here in the poll work and |
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353 | * the real state when userspace forces a full detect |
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354 | * call after receiving a hotplug event due to this |
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355 | * change. |
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356 | * |
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357 | * Hence clamp an unknown detect status to the old |
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358 | * value. |
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359 | */ |
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360 | if (connector->status == connector_status_unknown) { |
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361 | connector->status = old_status; |
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362 | continue; |
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363 | } |
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364 | |||
5060 | serge | 365 | old = drm_get_connector_status_name(old_status); |
366 | new = drm_get_connector_status_name(connector->status); |
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367 | |||
368 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
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369 | "status updated from %s to %s\n", |
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370 | connector->base.id, |
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371 | connector->name, |
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372 | old, new); |
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373 | |||
374 | changed = true; |
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375 | } |
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376 | } |
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377 | |||
378 | mutex_unlock(&dev->mode_config.mutex); |
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379 | |||
6084 | serge | 380 | out: ; |
381 | |||
5060 | serge | 382 | // if (changed) |
383 | // drm_kms_helper_hotplug_event(dev); |
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384 | |||
385 | // if (repoll) |
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386 | // schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
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387 | } |
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388 | |||
389 | /** |
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390 | * drm_kms_helper_poll_disable - disable output polling |
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391 | * @dev: drm_device |
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392 | * |
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393 | * This function disables the output polling work. |
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394 | * |
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395 | * Drivers can call this helper from their device suspend implementation. It is |
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396 | * not an error to call this even when output polling isn't enabled or arlready |
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397 | * disabled. |
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398 | */ |
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399 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
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400 | { |
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401 | if (!dev->mode_config.poll_enabled) |
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402 | return; |
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403 | // cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
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404 | } |
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405 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
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406 | |||
407 | /** |
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408 | * drm_kms_helper_poll_enable - re-enable output polling. |
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409 | * @dev: drm_device |
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410 | * |
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411 | * This function re-enables the output polling work. |
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412 | * |
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413 | * Drivers can call this helper from their device resume implementation. It is |
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414 | * an error to call this when the output polling support has not yet been set |
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415 | * up. |
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416 | */ |
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417 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
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418 | { |
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6084 | serge | 419 | mutex_lock(&dev->mode_config.mutex); |
420 | drm_kms_helper_poll_enable_locked(dev); |
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421 | mutex_unlock(&dev->mode_config.mutex); |
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5060 | serge | 422 | } |
423 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
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424 | |||
425 | /** |
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426 | * drm_kms_helper_poll_init - initialize and enable output polling |
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427 | * @dev: drm_device |
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428 | * |
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429 | * This function intializes and then also enables output polling support for |
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430 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
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431 | * this helper infrastructure to regularly poll such connectors for changes in |
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432 | * their connection state. |
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433 | * |
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434 | * Drivers can control which connectors are polled by setting the |
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435 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
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436 | * connectors where probing live outputs can result in visual distortion drivers |
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437 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
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438 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
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439 | * completely ignored by the polling logic. |
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440 | * |
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441 | * Note that a connector can be both polled and probed from the hotplug handler, |
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442 | * in case the hotplug interrupt is known to be unreliable. |
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443 | */ |
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444 | void drm_kms_helper_poll_init(struct drm_device *dev) |
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445 | { |
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446 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
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447 | dev->mode_config.poll_enabled = true; |
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448 | |||
449 | drm_kms_helper_poll_enable(dev); |
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450 | } |
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451 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
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452 | |||
453 | /** |
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454 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
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455 | * @dev: drm_device |
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456 | */ |
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457 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
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458 | { |
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459 | drm_kms_helper_poll_disable(dev); |
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460 | } |
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461 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
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462 | |||
463 | /** |
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464 | * drm_helper_hpd_irq_event - hotplug processing |
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465 | * @dev: drm_device |
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466 | * |
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467 | * Drivers can use this helper function to run a detect cycle on all connectors |
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468 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
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469 | * other connectors are ignored, which is useful to avoid reprobing fixed |
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470 | * panels. |
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471 | * |
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472 | * This helper function is useful for drivers which can't or don't track hotplug |
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473 | * interrupts for each connector. |
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474 | * |
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475 | * Drivers which support hotplug interrupts for each connector individually and |
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476 | * which have a more fine-grained detect logic should bypass this code and |
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477 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
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478 | * changed. |
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479 | * |
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480 | * This function must be called from process context with no mode |
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481 | * setting locks held. |
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482 | * |
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483 | * Note that a connector can be both polled and probed from the hotplug handler, |
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484 | * in case the hotplug interrupt is known to be unreliable. |
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485 | */ |
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486 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
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487 | { |
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488 | struct drm_connector *connector; |
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489 | enum drm_connector_status old_status; |
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490 | bool changed = false; |
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491 | |||
492 | if (!dev->mode_config.poll_enabled) |
||
493 | return false; |
||
494 | |||
495 | mutex_lock(&dev->mode_config.mutex); |
||
6084 | serge | 496 | drm_for_each_connector(connector, dev) { |
5060 | serge | 497 | |
498 | /* Only handle HPD capable connectors. */ |
||
499 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
||
500 | continue; |
||
501 | |||
502 | old_status = connector->status; |
||
503 | |||
504 | connector->status = connector->funcs->detect(connector, false); |
||
505 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
||
506 | connector->base.id, |
||
507 | connector->name, |
||
508 | drm_get_connector_status_name(old_status), |
||
509 | drm_get_connector_status_name(connector->status)); |
||
510 | if (old_status != connector->status) |
||
511 | changed = true; |
||
512 | } |
||
513 | |||
514 | mutex_unlock(&dev->mode_config.mutex); |
||
515 | |||
516 | if (changed) |
||
517 | drm_kms_helper_hotplug_event(dev); |
||
518 | |||
519 | return changed; |
||
520 | } |
||
521 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |