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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 | |||
6296 | serge | 124 | if (poll) |
125 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); |
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5060 | serge | 126 | } |
6084 | serge | 127 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
5060 | serge | 128 | |
6084 | serge | 129 | |
5060 | serge | 130 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
131 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) |
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132 | { |
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133 | struct drm_device *dev = connector->dev; |
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134 | struct drm_display_mode *mode; |
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6084 | serge | 135 | const struct drm_connector_helper_funcs *connector_funcs = |
5060 | serge | 136 | connector->helper_private; |
137 | int count = 0; |
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138 | int mode_flags = 0; |
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139 | bool verbose_prune = true; |
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6084 | serge | 140 | enum drm_connector_status old_status; |
5060 | serge | 141 | |
142 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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143 | |||
144 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
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145 | connector->name); |
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146 | /* set all modes to the unverified state */ |
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147 | list_for_each_entry(mode, &connector->modes, head) |
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148 | mode->status = MODE_UNVERIFIED; |
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149 | |||
150 | if (connector->force) { |
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5271 | serge | 151 | if (connector->force == DRM_FORCE_ON || |
152 | connector->force == DRM_FORCE_ON_DIGITAL) |
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5060 | serge | 153 | connector->status = connector_status_connected; |
154 | else |
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155 | connector->status = connector_status_disconnected; |
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156 | if (connector->funcs->force) |
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157 | connector->funcs->force(connector); |
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158 | } else { |
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6084 | serge | 159 | old_status = connector->status; |
160 | |||
5060 | serge | 161 | connector->status = connector->funcs->detect(connector, true); |
6296 | serge | 162 | |
163 | /* |
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164 | * Normally either the driver's hpd code or the poll loop should |
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165 | * pick up any changes and fire the hotplug event. But if |
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166 | * userspace sneaks in a probe, we might miss a change. Hence |
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167 | * check here, and if anything changed start the hotplug code. |
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168 | */ |
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169 | if (old_status != connector->status) { |
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170 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n", |
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171 | connector->base.id, |
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172 | connector->name, |
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173 | old_status, connector->status); |
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174 | |||
175 | /* |
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176 | * The hotplug event code might call into the fb |
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177 | * helpers, and so expects that we do not hold any |
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178 | * locks. Fire up the poll struct instead, it will |
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179 | * disable itself again. |
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180 | */ |
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181 | dev->mode_config.delayed_event = true; |
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182 | if (dev->mode_config.poll_enabled) |
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183 | schedule_delayed_work(&dev->mode_config.output_poll_work, |
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184 | 0); |
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185 | } |
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5060 | serge | 186 | } |
187 | |||
188 | /* Re-enable polling in case the global poll config changed. */ |
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189 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
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6084 | serge | 190 | drm_kms_helper_poll_enable_locked(dev); |
5060 | serge | 191 | |
192 | dev->mode_config.poll_running = drm_kms_helper_poll; |
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193 | |||
194 | if (connector->status == connector_status_disconnected) { |
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195 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
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196 | connector->base.id, connector->name); |
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197 | drm_mode_connector_update_edid_property(connector, NULL); |
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198 | verbose_prune = false; |
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199 | goto prune; |
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200 | } |
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201 | |||
202 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
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203 | count = drm_load_edid_firmware(connector); |
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204 | if (count == 0) |
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205 | #endif |
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206 | { |
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207 | if (connector->override_edid) { |
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208 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; |
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209 | |||
210 | count = drm_add_edid_modes(connector, edid); |
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6084 | serge | 211 | drm_edid_to_eld(connector, edid); |
5060 | serge | 212 | } else |
6084 | serge | 213 | count = (*connector_funcs->get_modes)(connector); |
5060 | serge | 214 | } |
215 | |||
216 | if (count == 0 && connector->status == connector_status_connected) |
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217 | count = drm_add_modes_noedid(connector, 1024, 768); |
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6088 | serge | 218 | count += drm_helper_probe_add_cmdline_mode(connector); |
5060 | serge | 219 | if (count == 0) |
220 | goto prune; |
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221 | |||
222 | drm_mode_connector_list_update(connector, merge_type_bits); |
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223 | |||
224 | if (connector->interlace_allowed) |
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225 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
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226 | if (connector->doublescan_allowed) |
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227 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
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228 | if (connector->stereo_allowed) |
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229 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
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230 | |||
231 | list_for_each_entry(mode, &connector->modes, head) { |
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6084 | serge | 232 | if (mode->status == MODE_OK) |
233 | mode->status = drm_mode_validate_basic(mode); |
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234 | |||
235 | if (mode->status == MODE_OK) |
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236 | mode->status = drm_mode_validate_size(mode, maxX, maxY); |
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237 | |||
238 | if (mode->status == MODE_OK) |
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239 | mode->status = drm_mode_validate_flag(mode, mode_flags); |
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240 | |||
5060 | serge | 241 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
242 | mode->status = connector_funcs->mode_valid(connector, |
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243 | mode); |
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244 | } |
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245 | |||
246 | prune: |
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247 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
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248 | |||
249 | if (list_empty(&connector->modes)) |
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250 | return 0; |
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251 | |||
252 | list_for_each_entry(mode, &connector->modes, head) |
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253 | mode->vrefresh = drm_mode_vrefresh(mode); |
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254 | |||
255 | drm_mode_sort(&connector->modes); |
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256 | |||
257 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
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258 | connector->name); |
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259 | list_for_each_entry(mode, &connector->modes, head) { |
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260 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
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261 | drm_mode_debug_printmodeline(mode); |
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262 | } |
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263 | |||
264 | return count; |
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265 | } |
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266 | |||
267 | /** |
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268 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
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269 | * @connector: connector to probe |
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270 | * @maxX: max width for modes |
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271 | * @maxY: max height for modes |
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272 | * |
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273 | * Based on the helper callbacks implemented by @connector try to detect all |
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274 | * valid modes. Modes will first be added to the connector's probed_modes list, |
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275 | * then culled (based on validity and the @maxX, @maxY parameters) and put into |
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276 | * the normal modes list. |
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277 | * |
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278 | * Intended to be use as a generic implementation of the ->fill_modes() |
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279 | * @connector vfunc for drivers that use the crtc helpers for output mode |
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280 | * filtering and detection. |
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281 | * |
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282 | * Returns: |
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283 | * The number of modes found on @connector. |
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284 | */ |
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285 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
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286 | uint32_t maxX, uint32_t maxY) |
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287 | { |
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288 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); |
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289 | } |
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290 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
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291 | |||
292 | /** |
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293 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes |
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294 | * @connector: connector to probe |
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295 | * @maxX: max width for modes |
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296 | * @maxY: max height for modes |
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297 | * |
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298 | * This operates like drm_hehlper_probe_single_connector_modes except it |
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299 | * replaces the mode bits instead of merging them for preferred modes. |
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300 | */ |
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301 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, |
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302 | uint32_t maxX, uint32_t maxY) |
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303 | { |
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304 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); |
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305 | } |
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306 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); |
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307 | |||
308 | /** |
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309 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
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310 | * @dev: drm_device whose connector state changed |
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311 | * |
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312 | * This function fires off the uevent for userspace and also calls the |
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313 | * output_poll_changed function, which is most commonly used to inform the fbdev |
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314 | * emulation code and allow it to update the fbcon output configuration. |
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315 | * |
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316 | * Drivers should call this from their hotplug handling code when a change is |
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317 | * detected. Note that this function does not do any output detection of its |
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318 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
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319 | * driver already. |
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320 | * |
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321 | * This function must be called from process context with no mode |
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322 | * setting locks held. |
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323 | */ |
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324 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
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325 | { |
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6296 | serge | 326 | /* send a uevent + call fbdev */ |
327 | drm_sysfs_hotplug_event(dev); |
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328 | if (dev->mode_config.funcs->output_poll_changed) |
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329 | dev->mode_config.funcs->output_poll_changed(dev); |
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5060 | serge | 330 | } |
331 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
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332 | |||
333 | static void output_poll_execute(struct work_struct *work) |
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334 | { |
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335 | struct delayed_work *delayed_work = to_delayed_work(work); |
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336 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
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337 | struct drm_connector *connector; |
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338 | enum drm_connector_status old_status; |
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6084 | serge | 339 | bool repoll = false, changed; |
5060 | serge | 340 | |
6084 | serge | 341 | /* Pick up any changes detected by the probe functions. */ |
342 | changed = dev->mode_config.delayed_event; |
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343 | dev->mode_config.delayed_event = false; |
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344 | |||
5060 | serge | 345 | if (!drm_kms_helper_poll) |
6084 | serge | 346 | goto out; |
5060 | serge | 347 | |
348 | mutex_lock(&dev->mode_config.mutex); |
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6084 | serge | 349 | drm_for_each_connector(connector, dev) { |
5060 | serge | 350 | |
351 | /* Ignore forced connectors. */ |
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352 | if (connector->force) |
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353 | continue; |
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354 | |||
355 | /* Ignore HPD capable connectors and connectors where we don't |
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356 | * want any hotplug detection at all for polling. */ |
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357 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
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358 | continue; |
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359 | |||
360 | old_status = connector->status; |
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361 | /* if we are connected and don't want to poll for disconnect |
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362 | skip it */ |
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363 | if (old_status == connector_status_connected && |
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364 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
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365 | continue; |
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366 | |||
6084 | serge | 367 | repoll = true; |
368 | |||
5060 | serge | 369 | connector->status = connector->funcs->detect(connector, false); |
370 | if (old_status != connector->status) { |
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371 | const char *old, *new; |
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372 | |||
6084 | serge | 373 | /* |
374 | * The poll work sets force=false when calling detect so |
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375 | * that drivers can avoid to do disruptive tests (e.g. |
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376 | * when load detect cycles could cause flickering on |
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377 | * other, running displays). This bears the risk that we |
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378 | * flip-flop between unknown here in the poll work and |
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379 | * the real state when userspace forces a full detect |
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380 | * call after receiving a hotplug event due to this |
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381 | * change. |
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382 | * |
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383 | * Hence clamp an unknown detect status to the old |
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384 | * value. |
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385 | */ |
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386 | if (connector->status == connector_status_unknown) { |
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387 | connector->status = old_status; |
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388 | continue; |
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389 | } |
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390 | |||
5060 | serge | 391 | old = drm_get_connector_status_name(old_status); |
392 | new = drm_get_connector_status_name(connector->status); |
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393 | |||
394 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
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395 | "status updated from %s to %s\n", |
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396 | connector->base.id, |
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397 | connector->name, |
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398 | old, new); |
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399 | |||
400 | changed = true; |
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401 | } |
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402 | } |
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403 | |||
404 | mutex_unlock(&dev->mode_config.mutex); |
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405 | |||
6296 | serge | 406 | out: |
407 | if (changed) |
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408 | drm_kms_helper_hotplug_event(dev); |
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6084 | serge | 409 | |
6296 | serge | 410 | if (repoll) |
411 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
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5060 | serge | 412 | } |
413 | |||
414 | /** |
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415 | * drm_kms_helper_poll_disable - disable output polling |
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416 | * @dev: drm_device |
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417 | * |
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418 | * This function disables the output polling work. |
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419 | * |
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420 | * Drivers can call this helper from their device suspend implementation. It is |
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421 | * not an error to call this even when output polling isn't enabled or arlready |
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422 | * disabled. |
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423 | */ |
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424 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
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425 | { |
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426 | if (!dev->mode_config.poll_enabled) |
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427 | return; |
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6296 | serge | 428 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
5060 | serge | 429 | } |
430 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
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431 | |||
432 | /** |
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433 | * drm_kms_helper_poll_enable - re-enable output polling. |
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434 | * @dev: drm_device |
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435 | * |
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436 | * This function re-enables the output polling work. |
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437 | * |
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438 | * Drivers can call this helper from their device resume implementation. It is |
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439 | * an error to call this when the output polling support has not yet been set |
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440 | * up. |
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441 | */ |
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442 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
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443 | { |
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6084 | serge | 444 | mutex_lock(&dev->mode_config.mutex); |
445 | drm_kms_helper_poll_enable_locked(dev); |
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446 | mutex_unlock(&dev->mode_config.mutex); |
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5060 | serge | 447 | } |
448 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
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449 | |||
450 | /** |
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451 | * drm_kms_helper_poll_init - initialize and enable output polling |
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452 | * @dev: drm_device |
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453 | * |
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454 | * This function intializes and then also enables output polling support for |
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455 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
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456 | * this helper infrastructure to regularly poll such connectors for changes in |
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457 | * their connection state. |
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458 | * |
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459 | * Drivers can control which connectors are polled by setting the |
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460 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
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461 | * connectors where probing live outputs can result in visual distortion drivers |
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462 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
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463 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
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464 | * completely ignored by the polling logic. |
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465 | * |
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466 | * Note that a connector can be both polled and probed from the hotplug handler, |
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467 | * in case the hotplug interrupt is known to be unreliable. |
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468 | */ |
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469 | void drm_kms_helper_poll_init(struct drm_device *dev) |
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470 | { |
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471 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
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472 | dev->mode_config.poll_enabled = true; |
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473 | |||
474 | drm_kms_helper_poll_enable(dev); |
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475 | } |
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476 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
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477 | |||
478 | /** |
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479 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
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480 | * @dev: drm_device |
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481 | */ |
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482 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
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483 | { |
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484 | drm_kms_helper_poll_disable(dev); |
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485 | } |
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486 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
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487 | |||
488 | /** |
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489 | * drm_helper_hpd_irq_event - hotplug processing |
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490 | * @dev: drm_device |
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491 | * |
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492 | * Drivers can use this helper function to run a detect cycle on all connectors |
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493 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
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494 | * other connectors are ignored, which is useful to avoid reprobing fixed |
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495 | * panels. |
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496 | * |
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497 | * This helper function is useful for drivers which can't or don't track hotplug |
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498 | * interrupts for each connector. |
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499 | * |
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500 | * Drivers which support hotplug interrupts for each connector individually and |
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501 | * which have a more fine-grained detect logic should bypass this code and |
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502 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
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503 | * changed. |
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504 | * |
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505 | * This function must be called from process context with no mode |
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506 | * setting locks held. |
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507 | * |
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508 | * Note that a connector can be both polled and probed from the hotplug handler, |
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509 | * in case the hotplug interrupt is known to be unreliable. |
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510 | */ |
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511 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
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512 | { |
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513 | struct drm_connector *connector; |
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514 | enum drm_connector_status old_status; |
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515 | bool changed = false; |
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516 | |||
517 | if (!dev->mode_config.poll_enabled) |
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518 | return false; |
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519 | |||
520 | mutex_lock(&dev->mode_config.mutex); |
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6084 | serge | 521 | drm_for_each_connector(connector, dev) { |
5060 | serge | 522 | |
523 | /* Only handle HPD capable connectors. */ |
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524 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
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525 | continue; |
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526 | |||
527 | old_status = connector->status; |
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528 | |||
529 | connector->status = connector->funcs->detect(connector, false); |
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530 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
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531 | connector->base.id, |
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532 | connector->name, |
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533 | drm_get_connector_status_name(old_status), |
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534 | drm_get_connector_status_name(connector->status)); |
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535 | if (old_status != connector->status) |
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536 | changed = true; |
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537 | } |
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538 | |||
539 | mutex_unlock(&dev->mode_config.mutex); |
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540 | |||
541 | if (changed) |
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542 | drm_kms_helper_hotplug_event(dev); |
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543 | |||
544 | return changed; |
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545 | } |
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546 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |