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5354 | serge | 1 | /* |
2 | * Copyright © 2014 Intel Corporation |
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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, sublicense, |
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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 next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * 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 NONINFRINGEMENT. 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 | * Authors: |
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24 | * Daniel Vetter |
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25 | */ |
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26 | |||
27 | /** |
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28 | * DOC: frontbuffer tracking |
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29 | * |
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30 | * Many features require us to track changes to the currently active |
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31 | * frontbuffer, especially rendering targeted at the frontbuffer. |
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32 | * |
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33 | * To be able to do so GEM tracks frontbuffers using a bitmask for all possible |
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34 | * frontbuffer slots through i915_gem_track_fb(). The function in this file are |
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35 | * then called when the contents of the frontbuffer are invalidated, when |
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36 | * frontbuffer rendering has stopped again to flush out all the changes and when |
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37 | * the frontbuffer is exchanged with a flip. Subsystems interested in |
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38 | * frontbuffer changes (e.g. PSR, FBC, DRRS) should directly put their callbacks |
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39 | * into the relevant places and filter for the frontbuffer slots that they are |
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40 | * interested int. |
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41 | * |
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42 | * On a high level there are two types of powersaving features. The first one |
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43 | * work like a special cache (FBC and PSR) and are interested when they should |
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44 | * stop caching and when to restart caching. This is done by placing callbacks |
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45 | * into the invalidate and the flush functions: At invalidate the caching must |
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46 | * be stopped and at flush time it can be restarted. And maybe they need to know |
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47 | * when the frontbuffer changes (e.g. when the hw doesn't initiate an invalidate |
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48 | * and flush on its own) which can be achieved with placing callbacks into the |
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49 | * flip functions. |
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50 | * |
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51 | * The other type of display power saving feature only cares about busyness |
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52 | * (e.g. DRRS). In that case all three (invalidate, flush and flip) indicate |
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53 | * busyness. There is no direct way to detect idleness. Instead an idle timer |
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54 | * work delayed work should be started from the flush and flip functions and |
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55 | * cancelled as soon as busyness is detected. |
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56 | * |
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57 | * Note that there's also an older frontbuffer activity tracking scheme which |
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58 | * just tracks general activity. This is done by the various mark_busy and |
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59 | * mark_idle functions. For display power management features using these |
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60 | * functions is deprecated and should be avoided. |
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61 | */ |
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62 | |||
63 | #include |
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64 | |||
65 | #include "intel_drv.h" |
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66 | #include "i915_drv.h" |
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67 | |||
68 | /** |
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69 | * intel_fb_obj_invalidate - invalidate frontbuffer object |
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70 | * @obj: GEM object to invalidate |
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6084 | serge | 71 | * @origin: which operation caused the invalidation |
5354 | serge | 72 | * |
73 | * This function gets called every time rendering on the given object starts and |
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74 | * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must |
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6084 | serge | 75 | * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed |
5354 | serge | 76 | * until the rendering completes or a flip on this frontbuffer plane is |
77 | * scheduled. |
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78 | */ |
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79 | void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj, |
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6084 | serge | 80 | enum fb_op_origin origin) |
5354 | serge | 81 | { |
82 | struct drm_device *dev = obj->base.dev; |
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6084 | serge | 83 | struct drm_i915_private *dev_priv = to_i915(dev); |
5354 | serge | 84 | |
85 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); |
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86 | |||
87 | if (!obj->frontbuffer_bits) |
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88 | return; |
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89 | |||
6084 | serge | 90 | if (origin == ORIGIN_CS) { |
5354 | serge | 91 | mutex_lock(&dev_priv->fb_tracking.lock); |
92 | dev_priv->fb_tracking.busy_bits |
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93 | |= obj->frontbuffer_bits; |
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94 | dev_priv->fb_tracking.flip_bits |
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95 | &= ~obj->frontbuffer_bits; |
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96 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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97 | } |
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98 | |||
99 | intel_psr_invalidate(dev, obj->frontbuffer_bits); |
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6084 | serge | 100 | intel_edp_drrs_invalidate(dev, obj->frontbuffer_bits); |
101 | intel_fbc_invalidate(dev_priv, obj->frontbuffer_bits, origin); |
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5354 | serge | 102 | } |
103 | |||
104 | /** |
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105 | * intel_frontbuffer_flush - flush frontbuffer |
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106 | * @dev: DRM device |
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107 | * @frontbuffer_bits: frontbuffer plane tracking bits |
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6084 | serge | 108 | * @origin: which operation caused the flush |
5354 | serge | 109 | * |
110 | * This function gets called every time rendering on the given planes has |
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111 | * completed and frontbuffer caching can be started again. Flushes will get |
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112 | * delayed if they're blocked by some outstanding asynchronous rendering. |
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113 | * |
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114 | * Can be called without any locks held. |
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115 | */ |
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6084 | serge | 116 | static void intel_frontbuffer_flush(struct drm_device *dev, |
117 | unsigned frontbuffer_bits, |
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118 | enum fb_op_origin origin) |
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5354 | serge | 119 | { |
6084 | serge | 120 | struct drm_i915_private *dev_priv = to_i915(dev); |
5354 | serge | 121 | |
122 | /* Delay flushing when rings are still busy.*/ |
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123 | mutex_lock(&dev_priv->fb_tracking.lock); |
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124 | frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits; |
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125 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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126 | |||
6084 | serge | 127 | if (!frontbuffer_bits) |
128 | return; |
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5354 | serge | 129 | |
6084 | serge | 130 | intel_edp_drrs_flush(dev, frontbuffer_bits); |
131 | intel_psr_flush(dev, frontbuffer_bits, origin); |
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132 | intel_fbc_flush(dev_priv, frontbuffer_bits, origin); |
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5354 | serge | 133 | } |
134 | |||
135 | /** |
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136 | * intel_fb_obj_flush - flush frontbuffer object |
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137 | * @obj: GEM object to flush |
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138 | * @retire: set when retiring asynchronous rendering |
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6084 | serge | 139 | * @origin: which operation caused the flush |
5354 | serge | 140 | * |
141 | * This function gets called every time rendering on the given object has |
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142 | * completed and frontbuffer caching can be started again. If @retire is true |
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143 | * then any delayed flushes will be unblocked. |
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144 | */ |
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145 | void intel_fb_obj_flush(struct drm_i915_gem_object *obj, |
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6084 | serge | 146 | bool retire, enum fb_op_origin origin) |
5354 | serge | 147 | { |
148 | struct drm_device *dev = obj->base.dev; |
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6084 | serge | 149 | struct drm_i915_private *dev_priv = to_i915(dev); |
5354 | serge | 150 | unsigned frontbuffer_bits; |
151 | |||
152 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); |
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153 | |||
154 | if (!obj->frontbuffer_bits) |
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155 | return; |
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156 | |||
157 | frontbuffer_bits = obj->frontbuffer_bits; |
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158 | |||
159 | if (retire) { |
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160 | mutex_lock(&dev_priv->fb_tracking.lock); |
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161 | /* Filter out new bits since rendering started. */ |
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162 | frontbuffer_bits &= dev_priv->fb_tracking.busy_bits; |
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163 | |||
164 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; |
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165 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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166 | } |
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167 | |||
6084 | serge | 168 | intel_frontbuffer_flush(dev, frontbuffer_bits, origin); |
5354 | serge | 169 | } |
170 | |||
171 | /** |
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172 | * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip |
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173 | * @dev: DRM device |
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174 | * @frontbuffer_bits: frontbuffer plane tracking bits |
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175 | * |
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176 | * This function gets called after scheduling a flip on @obj. The actual |
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177 | * frontbuffer flushing will be delayed until completion is signalled with |
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178 | * intel_frontbuffer_flip_complete. If an invalidate happens in between this |
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179 | * flush will be cancelled. |
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180 | * |
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181 | * Can be called without any locks held. |
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182 | */ |
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183 | void intel_frontbuffer_flip_prepare(struct drm_device *dev, |
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184 | unsigned frontbuffer_bits) |
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185 | { |
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6084 | serge | 186 | struct drm_i915_private *dev_priv = to_i915(dev); |
5354 | serge | 187 | |
188 | mutex_lock(&dev_priv->fb_tracking.lock); |
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189 | dev_priv->fb_tracking.flip_bits |= frontbuffer_bits; |
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190 | /* Remove stale busy bits due to the old buffer. */ |
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191 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; |
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192 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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6084 | serge | 193 | |
194 | intel_psr_single_frame_update(dev, frontbuffer_bits); |
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5354 | serge | 195 | } |
196 | |||
197 | /** |
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198 | * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip |
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199 | * @dev: DRM device |
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200 | * @frontbuffer_bits: frontbuffer plane tracking bits |
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201 | * |
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202 | * This function gets called after the flip has been latched and will complete |
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203 | * on the next vblank. It will execute the flush if it hasn't been cancelled yet. |
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204 | * |
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205 | * Can be called without any locks held. |
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206 | */ |
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207 | void intel_frontbuffer_flip_complete(struct drm_device *dev, |
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208 | unsigned frontbuffer_bits) |
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209 | { |
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6084 | serge | 210 | struct drm_i915_private *dev_priv = to_i915(dev); |
5354 | serge | 211 | |
212 | mutex_lock(&dev_priv->fb_tracking.lock); |
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213 | /* Mask any cancelled flips. */ |
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214 | frontbuffer_bits &= dev_priv->fb_tracking.flip_bits; |
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215 | dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits; |
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216 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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217 | |||
6084 | serge | 218 | intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP); |
5354 | serge | 219 | } |
6084 | serge | 220 | |
221 | /** |
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222 | * intel_frontbuffer_flip - synchronous frontbuffer flip |
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223 | * @dev: DRM device |
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224 | * @frontbuffer_bits: frontbuffer plane tracking bits |
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225 | * |
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226 | * This function gets called after scheduling a flip on @obj. This is for |
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227 | * synchronous plane updates which will happen on the next vblank and which will |
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228 | * not get delayed by pending gpu rendering. |
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229 | * |
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230 | * Can be called without any locks held. |
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231 | */ |
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232 | void intel_frontbuffer_flip(struct drm_device *dev, |
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233 | unsigned frontbuffer_bits) |
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234 | { |
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235 | struct drm_i915_private *dev_priv = to_i915(dev); |
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236 | |||
237 | mutex_lock(&dev_priv->fb_tracking.lock); |
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238 | /* Remove stale busy bits due to the old buffer. */ |
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239 | dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits; |
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240 | mutex_unlock(&dev_priv->fb_tracking.lock); |
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241 | |||
242 | intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP); |
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243 | } |