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6084 | serge | 1 | /* |
2 | * Copyright (c) 2014 Samsung Electronics Co., Ltd |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sub license, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the |
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12 | * next paragraph) shall be included in all copies or substantial portions |
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13 | * of the Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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21 | * DEALINGS IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | #include |
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25 | #include |
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26 | |||
27 | #include |
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28 | |||
29 | #include "drm/drmP.h" |
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30 | |||
31 | /** |
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32 | * DOC: overview |
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33 | * |
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6937 | serge | 34 | * struct &drm_bridge represents a device that hangs on to an encoder. These are |
35 | * handy when a regular &drm_encoder entity isn't enough to represent the entire |
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6084 | serge | 36 | * encoder chain. |
37 | * |
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6937 | serge | 38 | * A bridge is always attached to a single &drm_encoder at a time, but can be |
6084 | serge | 39 | * either connected to it directly, or through an intermediate bridge: |
40 | * |
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7144 | serge | 41 | * encoder ---> bridge B ---> bridge A |
6084 | serge | 42 | * |
43 | * Here, the output of the encoder feeds to bridge B, and that furthers feeds to |
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44 | * bridge A. |
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45 | * |
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46 | * The driver using the bridge is responsible to make the associations between |
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47 | * the encoder and bridges. Once these links are made, the bridges will |
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48 | * participate along with encoder functions to perform mode_set/enable/disable |
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6937 | serge | 49 | * through the ops provided in &drm_bridge_funcs. |
6084 | serge | 50 | * |
51 | * drm_bridge, like drm_panel, aren't drm_mode_object entities like planes, |
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6937 | serge | 52 | * CRTCs, encoders or connectors and hence are not visible to userspace. They |
53 | * just provide additional hooks to get the desired output at the end of the |
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54 | * encoder chain. |
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55 | * |
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56 | * Bridges can also be chained up using the next pointer in struct &drm_bridge. |
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57 | * |
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58 | * Both legacy CRTC helpers and the new atomic modeset helpers support bridges. |
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6084 | serge | 59 | */ |
60 | |||
61 | static DEFINE_MUTEX(bridge_lock); |
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62 | static LIST_HEAD(bridge_list); |
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63 | |||
64 | /** |
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65 | * drm_bridge_add - add the given bridge to the global bridge list |
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66 | * |
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67 | * @bridge: bridge control structure |
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68 | * |
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69 | * RETURNS: |
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70 | * Unconditionally returns Zero. |
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71 | */ |
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72 | int drm_bridge_add(struct drm_bridge *bridge) |
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73 | { |
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74 | mutex_lock(&bridge_lock); |
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75 | list_add_tail(&bridge->list, &bridge_list); |
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76 | mutex_unlock(&bridge_lock); |
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77 | |||
78 | return 0; |
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79 | } |
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80 | EXPORT_SYMBOL(drm_bridge_add); |
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81 | |||
82 | /** |
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83 | * drm_bridge_remove - remove the given bridge from the global bridge list |
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84 | * |
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85 | * @bridge: bridge control structure |
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86 | */ |
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87 | void drm_bridge_remove(struct drm_bridge *bridge) |
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88 | { |
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89 | mutex_lock(&bridge_lock); |
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90 | list_del_init(&bridge->list); |
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91 | mutex_unlock(&bridge_lock); |
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92 | } |
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93 | EXPORT_SYMBOL(drm_bridge_remove); |
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94 | |||
95 | /** |
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96 | * drm_bridge_attach - associate given bridge to our DRM device |
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97 | * |
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98 | * @dev: DRM device |
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99 | * @bridge: bridge control structure |
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100 | * |
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101 | * called by a kms driver to link one of our encoder/bridge to the given |
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102 | * bridge. |
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103 | * |
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104 | * Note that setting up links between the bridge and our encoder/bridge |
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105 | * objects needs to be handled by the kms driver itself |
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106 | * |
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107 | * RETURNS: |
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108 | * Zero on success, error code on failure |
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109 | */ |
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110 | int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge) |
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111 | { |
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112 | if (!dev || !bridge) |
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113 | return -EINVAL; |
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114 | |||
115 | if (bridge->dev) |
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116 | return -EBUSY; |
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117 | |||
118 | bridge->dev = dev; |
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119 | |||
120 | if (bridge->funcs->attach) |
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121 | return bridge->funcs->attach(bridge); |
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122 | |||
123 | return 0; |
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124 | } |
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125 | EXPORT_SYMBOL(drm_bridge_attach); |
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126 | |||
127 | /** |
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128 | * DOC: bridge callbacks |
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129 | * |
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6937 | serge | 130 | * The &drm_bridge_funcs ops are populated by the bridge driver. The DRM |
131 | * internals (atomic and CRTC helpers) use the helpers defined in drm_bridge.c |
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132 | * These helpers call a specific &drm_bridge_funcs op for all the bridges |
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6084 | serge | 133 | * during encoder configuration. |
134 | * |
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6937 | serge | 135 | * For detailed specification of the bridge callbacks see &drm_bridge_funcs. |
6084 | serge | 136 | */ |
137 | |||
138 | /** |
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139 | * drm_bridge_mode_fixup - fixup proposed mode for all bridges in the |
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140 | * encoder chain |
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141 | * @bridge: bridge control structure |
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142 | * @mode: desired mode to be set for the bridge |
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143 | * @adjusted_mode: updated mode that works for this bridge |
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144 | * |
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6937 | serge | 145 | * Calls ->mode_fixup() &drm_bridge_funcs op for all the bridges in the |
6084 | serge | 146 | * encoder chain, starting from the first bridge to the last. |
147 | * |
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148 | * Note: the bridge passed should be the one closest to the encoder |
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149 | * |
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150 | * RETURNS: |
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151 | * true on success, false on failure |
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152 | */ |
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153 | bool drm_bridge_mode_fixup(struct drm_bridge *bridge, |
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154 | const struct drm_display_mode *mode, |
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155 | struct drm_display_mode *adjusted_mode) |
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156 | { |
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157 | bool ret = true; |
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158 | |||
159 | if (!bridge) |
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160 | return true; |
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161 | |||
162 | if (bridge->funcs->mode_fixup) |
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163 | ret = bridge->funcs->mode_fixup(bridge, mode, adjusted_mode); |
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164 | |||
165 | ret = ret && drm_bridge_mode_fixup(bridge->next, mode, adjusted_mode); |
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166 | |||
167 | return ret; |
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168 | } |
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169 | EXPORT_SYMBOL(drm_bridge_mode_fixup); |
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170 | |||
171 | /** |
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6937 | serge | 172 | * drm_bridge_disable - calls ->disable() &drm_bridge_funcs op for all |
6084 | serge | 173 | * bridges in the encoder chain. |
174 | * @bridge: bridge control structure |
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175 | * |
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6937 | serge | 176 | * Calls ->disable() &drm_bridge_funcs op for all the bridges in the encoder |
6084 | serge | 177 | * chain, starting from the last bridge to the first. These are called before |
178 | * calling the encoder's prepare op. |
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179 | * |
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180 | * Note: the bridge passed should be the one closest to the encoder |
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181 | */ |
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182 | void drm_bridge_disable(struct drm_bridge *bridge) |
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183 | { |
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184 | if (!bridge) |
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185 | return; |
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186 | |||
187 | drm_bridge_disable(bridge->next); |
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188 | |||
7144 | serge | 189 | if (bridge->funcs->disable) |
190 | bridge->funcs->disable(bridge); |
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6084 | serge | 191 | } |
192 | EXPORT_SYMBOL(drm_bridge_disable); |
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193 | |||
194 | /** |
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6937 | serge | 195 | * drm_bridge_post_disable - calls ->post_disable() &drm_bridge_funcs op for |
6084 | serge | 196 | * all bridges in the encoder chain. |
197 | * @bridge: bridge control structure |
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198 | * |
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6937 | serge | 199 | * Calls ->post_disable() &drm_bridge_funcs op for all the bridges in the |
6084 | serge | 200 | * encoder chain, starting from the first bridge to the last. These are called |
201 | * after completing the encoder's prepare op. |
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202 | * |
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203 | * Note: the bridge passed should be the one closest to the encoder |
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204 | */ |
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205 | void drm_bridge_post_disable(struct drm_bridge *bridge) |
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206 | { |
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207 | if (!bridge) |
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208 | return; |
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209 | |||
7144 | serge | 210 | if (bridge->funcs->post_disable) |
211 | bridge->funcs->post_disable(bridge); |
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6084 | serge | 212 | |
213 | drm_bridge_post_disable(bridge->next); |
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214 | } |
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215 | EXPORT_SYMBOL(drm_bridge_post_disable); |
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216 | |||
217 | /** |
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218 | * drm_bridge_mode_set - set proposed mode for all bridges in the |
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219 | * encoder chain |
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220 | * @bridge: bridge control structure |
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221 | * @mode: desired mode to be set for the bridge |
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222 | * @adjusted_mode: updated mode that works for this bridge |
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223 | * |
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6937 | serge | 224 | * Calls ->mode_set() &drm_bridge_funcs op for all the bridges in the |
6084 | serge | 225 | * encoder chain, starting from the first bridge to the last. |
226 | * |
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227 | * Note: the bridge passed should be the one closest to the encoder |
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228 | */ |
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229 | void drm_bridge_mode_set(struct drm_bridge *bridge, |
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230 | struct drm_display_mode *mode, |
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231 | struct drm_display_mode *adjusted_mode) |
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232 | { |
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233 | if (!bridge) |
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234 | return; |
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235 | |||
236 | if (bridge->funcs->mode_set) |
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237 | bridge->funcs->mode_set(bridge, mode, adjusted_mode); |
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238 | |||
239 | drm_bridge_mode_set(bridge->next, mode, adjusted_mode); |
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240 | } |
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241 | EXPORT_SYMBOL(drm_bridge_mode_set); |
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242 | |||
243 | /** |
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6937 | serge | 244 | * drm_bridge_pre_enable - calls ->pre_enable() &drm_bridge_funcs op for all |
6084 | serge | 245 | * bridges in the encoder chain. |
246 | * @bridge: bridge control structure |
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247 | * |
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6937 | serge | 248 | * Calls ->pre_enable() &drm_bridge_funcs op for all the bridges in the encoder |
6084 | serge | 249 | * chain, starting from the last bridge to the first. These are called |
250 | * before calling the encoder's commit op. |
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251 | * |
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252 | * Note: the bridge passed should be the one closest to the encoder |
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253 | */ |
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254 | void drm_bridge_pre_enable(struct drm_bridge *bridge) |
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255 | { |
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256 | if (!bridge) |
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257 | return; |
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258 | |||
259 | drm_bridge_pre_enable(bridge->next); |
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260 | |||
7144 | serge | 261 | if (bridge->funcs->pre_enable) |
262 | bridge->funcs->pre_enable(bridge); |
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6084 | serge | 263 | } |
264 | EXPORT_SYMBOL(drm_bridge_pre_enable); |
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265 | |||
266 | /** |
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6937 | serge | 267 | * drm_bridge_enable - calls ->enable() &drm_bridge_funcs op for all bridges |
6084 | serge | 268 | * in the encoder chain. |
269 | * @bridge: bridge control structure |
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270 | * |
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6937 | serge | 271 | * Calls ->enable() &drm_bridge_funcs op for all the bridges in the encoder |
6084 | serge | 272 | * chain, starting from the first bridge to the last. These are called |
273 | * after completing the encoder's commit op. |
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274 | * |
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275 | * Note that the bridge passed should be the one closest to the encoder |
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276 | */ |
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277 | void drm_bridge_enable(struct drm_bridge *bridge) |
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278 | { |
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279 | if (!bridge) |
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280 | return; |
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281 | |||
7144 | serge | 282 | if (bridge->funcs->enable) |
283 | bridge->funcs->enable(bridge); |
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6084 | serge | 284 | |
285 | drm_bridge_enable(bridge->next); |
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286 | } |
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287 | EXPORT_SYMBOL(drm_bridge_enable); |
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288 | |||
289 | #ifdef CONFIG_OF |
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290 | /** |
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291 | * of_drm_find_bridge - find the bridge corresponding to the device node in |
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292 | * the global bridge list |
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293 | * |
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294 | * @np: device node |
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295 | * |
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296 | * RETURNS: |
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297 | * drm_bridge control struct on success, NULL on failure |
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298 | */ |
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299 | struct drm_bridge *of_drm_find_bridge(struct device_node *np) |
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300 | { |
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301 | struct drm_bridge *bridge; |
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302 | |||
303 | mutex_lock(&bridge_lock); |
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304 | |||
305 | list_for_each_entry(bridge, &bridge_list, list) { |
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306 | if (bridge->of_node == np) { |
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307 | mutex_unlock(&bridge_lock); |
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308 | return bridge; |
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309 | } |
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310 | } |
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311 | |||
312 | mutex_unlock(&bridge_lock); |
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313 | return NULL; |
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314 | } |
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315 | EXPORT_SYMBOL(of_drm_find_bridge); |
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316 | #endif |
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317 | |||
318 | MODULE_AUTHOR("Ajay Kumar |
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319 | MODULE_DESCRIPTION("DRM bridge infrastructure"); |
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320 | MODULE_LICENSE("GPL and additional rights"); |