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5060 | serge | 1 | /* |
2 | * drm_irq.c IRQ and vblank support |
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1963 | serge | 3 | * |
4 | * \author Rickard E. (Rik) Faith |
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5 | * \author Gareth Hughes |
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6 | */ |
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7 | |||
8 | /* |
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9 | * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com |
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10 | * |
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11 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
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12 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
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13 | * All Rights Reserved. |
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14 | * |
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15 | * Permission is hereby granted, free of charge, to any person obtaining a |
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16 | * copy of this software and associated documentation files (the "Software"), |
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17 | * to deal in the Software without restriction, including without limitation |
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18 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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19 | * and/or sell copies of the Software, and to permit persons to whom the |
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20 | * Software is furnished to do so, subject to the following conditions: |
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21 | * |
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22 | * The above copyright notice and this permission notice (including the next |
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23 | * paragraph) shall be included in all copies or substantial portions of the |
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24 | * Software. |
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25 | * |
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26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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29 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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30 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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31 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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32 | * OTHER DEALINGS IN THE SOFTWARE. |
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33 | */ |
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34 | |||
3031 | serge | 35 | #include |
1963 | serge | 36 | //#include "drm_trace.h" |
5271 | serge | 37 | #include "drm_internal.h" |
1963 | serge | 38 | |
39 | //#include |
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40 | #include |
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41 | |||
5271 | serge | 42 | #include |
3031 | serge | 43 | #include |
1963 | serge | 44 | |
6084 | serge | 45 | ktime_t ktime_get(void); |
46 | |||
47 | static inline ktime_t ktime_get_real(void) |
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48 | { |
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49 | return ktime_get(); |
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50 | } |
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51 | |||
52 | static inline ktime_t ktime_mono_to_real(ktime_t mono) |
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53 | { |
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54 | return mono; |
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55 | } |
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56 | |||
6131 | serge | 57 | irqreturn_t device_irq_handler(struct drm_device *dev) |
58 | { |
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59 | return dev->driver->irq_handler(0, dev); |
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60 | } |
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6084 | serge | 61 | |
1963 | serge | 62 | /* Access macro for slots in vblank timestamp ringbuffer. */ |
6084 | serge | 63 | #define vblanktimestamp(dev, pipe, count) \ |
64 | ((dev)->vblank[pipe].time[(count) % DRM_VBLANKTIME_RBSIZE]) |
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1963 | serge | 65 | |
66 | /* Retry timestamp calculation up to 3 times to satisfy |
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67 | * drm_timestamp_precision before giving up. |
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68 | */ |
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69 | #define DRM_TIMESTAMP_MAXRETRIES 3 |
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70 | |||
71 | /* Threshold in nanoseconds for detection of redundant |
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72 | * vblank irq in drm_handle_vblank(). 1 msec should be ok. |
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73 | */ |
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74 | #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000 |
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75 | |||
5271 | serge | 76 | static bool |
6084 | serge | 77 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
5271 | serge | 78 | struct timeval *tvblank, unsigned flags); |
79 | |||
80 | static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ |
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81 | |||
5060 | serge | 82 | /* |
6084 | serge | 83 | * Default to use monotonic timestamps for wait-for-vblank and page-flip |
84 | * complete events. |
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5060 | serge | 85 | */ |
6084 | serge | 86 | unsigned int drm_timestamp_monotonic = 1; |
1963 | serge | 87 | |
6084 | serge | 88 | static int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ |
5060 | serge | 89 | |
6084 | serge | 90 | module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); |
91 | module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); |
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92 | module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); |
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93 | |||
94 | static void store_vblank(struct drm_device *dev, unsigned int pipe, |
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95 | u32 vblank_count_inc, |
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96 | struct timeval *t_vblank, u32 last) |
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97 | { |
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98 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
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99 | u32 tslot; |
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100 | |||
101 | assert_spin_locked(&dev->vblank_time_lock); |
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102 | |||
103 | vblank->last = last; |
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104 | |||
105 | /* All writers hold the spinlock, but readers are serialized by |
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106 | * the latching of vblank->count below. |
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107 | */ |
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108 | tslot = vblank->count + vblank_count_inc; |
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109 | vblanktimestamp(dev, pipe, tslot) = *t_vblank; |
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110 | |||
111 | /* |
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112 | * vblank timestamp updates are protected on the write side with |
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113 | * vblank_time_lock, but on the read side done locklessly using a |
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114 | * sequence-lock on the vblank counter. Ensure correct ordering using |
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115 | * memory barrriers. We need the barrier both before and also after the |
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116 | * counter update to synchronize with the next timestamp write. |
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117 | * The read-side barriers for this are in drm_vblank_count_and_time. |
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118 | */ |
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119 | smp_wmb(); |
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120 | vblank->count += vblank_count_inc; |
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121 | smp_wmb(); |
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122 | } |
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123 | |||
5060 | serge | 124 | /** |
6084 | serge | 125 | * drm_reset_vblank_timestamp - reset the last timestamp to the last vblank |
126 | * @dev: DRM device |
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127 | * @pipe: index of CRTC for which to reset the timestamp |
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128 | * |
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129 | * Reset the stored timestamp for the current vblank count to correspond |
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130 | * to the last vblank occurred. |
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131 | * |
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132 | * Only to be called from drm_vblank_on(). |
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133 | * |
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134 | * Note: caller must hold dev->vbl_lock since this reads & writes |
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135 | * device vblank fields. |
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136 | */ |
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137 | static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe) |
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138 | { |
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139 | u32 cur_vblank; |
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140 | bool rc; |
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141 | struct timeval t_vblank; |
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142 | int count = DRM_TIMESTAMP_MAXRETRIES; |
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143 | |||
144 | spin_lock(&dev->vblank_time_lock); |
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145 | |||
146 | /* |
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147 | * sample the current counter to avoid random jumps |
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148 | * when drm_vblank_enable() applies the diff |
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149 | */ |
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150 | do { |
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151 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
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152 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0); |
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153 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
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154 | |||
155 | /* |
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156 | * Only reinitialize corresponding vblank timestamp if high-precision query |
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157 | * available and didn't fail. Otherwise reinitialize delayed at next vblank |
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158 | * interrupt and assign 0 for now, to mark the vblanktimestamp as invalid. |
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159 | */ |
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160 | if (!rc) |
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161 | t_vblank = (struct timeval) {0, 0}; |
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162 | |||
163 | /* |
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164 | * +1 to make sure user will never see the same |
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165 | * vblank counter value before and after a modeset |
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166 | */ |
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167 | store_vblank(dev, pipe, 1, &t_vblank, cur_vblank); |
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168 | |||
169 | spin_unlock(&dev->vblank_time_lock); |
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170 | } |
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171 | |||
172 | /** |
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173 | * drm_update_vblank_count - update the master vblank counter |
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174 | * @dev: DRM device |
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175 | * @pipe: counter to update |
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176 | * |
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177 | * Call back into the driver to update the appropriate vblank counter |
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178 | * (specified by @pipe). Deal with wraparound, if it occurred, and |
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179 | * update the last read value so we can deal with wraparound on the next |
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180 | * call if necessary. |
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181 | * |
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182 | * Only necessary when going from off->on, to account for frames we |
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183 | * didn't get an interrupt for. |
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184 | * |
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185 | * Note: caller must hold dev->vbl_lock since this reads & writes |
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186 | * device vblank fields. |
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187 | */ |
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188 | static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe, |
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189 | unsigned long flags) |
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190 | { |
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191 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
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192 | u32 cur_vblank, diff; |
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193 | bool rc; |
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194 | struct timeval t_vblank; |
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195 | int count = DRM_TIMESTAMP_MAXRETRIES; |
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196 | int framedur_ns = vblank->framedur_ns; |
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197 | |||
198 | /* |
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199 | * Interrupts were disabled prior to this call, so deal with counter |
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200 | * wrap if needed. |
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201 | * NOTE! It's possible we lost a full dev->max_vblank_count + 1 events |
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202 | * here if the register is small or we had vblank interrupts off for |
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203 | * a long time. |
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204 | * |
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205 | * We repeat the hardware vblank counter & timestamp query until |
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206 | * we get consistent results. This to prevent races between gpu |
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207 | * updating its hardware counter while we are retrieving the |
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208 | * corresponding vblank timestamp. |
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209 | */ |
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210 | do { |
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211 | cur_vblank = dev->driver->get_vblank_counter(dev, pipe); |
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212 | rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags); |
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213 | } while (cur_vblank != dev->driver->get_vblank_counter(dev, pipe) && --count > 0); |
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214 | |||
215 | if (dev->max_vblank_count != 0) { |
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216 | /* trust the hw counter when it's around */ |
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217 | diff = (cur_vblank - vblank->last) & dev->max_vblank_count; |
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218 | } else if (rc && framedur_ns) { |
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219 | const struct timeval *t_old; |
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220 | u64 diff_ns; |
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221 | |||
222 | t_old = &vblanktimestamp(dev, pipe, vblank->count); |
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223 | diff_ns = timeval_to_ns(&t_vblank) - timeval_to_ns(t_old); |
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224 | |||
225 | /* |
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226 | * Figure out how many vblanks we've missed based |
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227 | * on the difference in the timestamps and the |
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228 | * frame/field duration. |
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229 | */ |
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230 | diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns); |
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231 | |||
232 | if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ) |
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233 | DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored." |
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234 | " diff_ns = %lld, framedur_ns = %d)\n", |
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235 | pipe, (long long) diff_ns, framedur_ns); |
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236 | } else { |
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237 | /* some kind of default for drivers w/o accurate vbl timestamping */ |
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238 | diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0; |
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239 | } |
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240 | |||
241 | DRM_DEBUG_VBL("updating vblank count on crtc %u:" |
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242 | " current=%u, diff=%u, hw=%u hw_last=%u\n", |
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243 | pipe, vblank->count, diff, cur_vblank, vblank->last); |
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244 | |||
245 | if (diff == 0) { |
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246 | WARN_ON_ONCE(cur_vblank != vblank->last); |
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247 | return; |
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248 | } |
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249 | |||
250 | /* |
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251 | * Only reinitialize corresponding vblank timestamp if high-precision query |
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252 | * available and didn't fail, or we were called from the vblank interrupt. |
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253 | * Otherwise reinitialize delayed at next vblank interrupt and assign 0 |
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254 | * for now, to mark the vblanktimestamp as invalid. |
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255 | */ |
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256 | if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0) |
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257 | t_vblank = (struct timeval) {0, 0}; |
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258 | |||
259 | store_vblank(dev, pipe, diff, &t_vblank, cur_vblank); |
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260 | } |
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261 | |||
262 | /* |
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263 | * Disable vblank irq's on crtc, make sure that last vblank count |
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264 | * of hardware and corresponding consistent software vblank counter |
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265 | * are preserved, even if there are any spurious vblank irq's after |
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266 | * disable. |
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267 | */ |
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268 | static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe) |
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269 | { |
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270 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
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271 | unsigned long irqflags; |
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272 | |||
273 | /* Prevent vblank irq processing while disabling vblank irqs, |
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274 | * so no updates of timestamps or count can happen after we've |
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275 | * disabled. Needed to prevent races in case of delayed irq's. |
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276 | */ |
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277 | spin_lock_irqsave(&dev->vblank_time_lock, irqflags); |
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278 | |||
279 | /* |
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280 | * Only disable vblank interrupts if they're enabled. This avoids |
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281 | * calling the ->disable_vblank() operation in atomic context with the |
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282 | * hardware potentially runtime suspended. |
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283 | */ |
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284 | if (vblank->enabled) { |
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285 | dev->driver->disable_vblank(dev, pipe); |
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286 | vblank->enabled = false; |
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287 | } |
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288 | |||
289 | /* |
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290 | * Always update the count and timestamp to maintain the |
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291 | * appearance that the counter has been ticking all along until |
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292 | * this time. This makes the count account for the entire time |
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293 | * between drm_vblank_on() and drm_vblank_off(). |
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294 | */ |
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295 | drm_update_vblank_count(dev, pipe, 0); |
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296 | |||
297 | spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); |
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298 | } |
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299 | |||
300 | static void vblank_disable_fn(unsigned long arg) |
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301 | { |
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302 | struct drm_vblank_crtc *vblank = (void *)arg; |
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303 | struct drm_device *dev = vblank->dev; |
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304 | unsigned int pipe = vblank->pipe; |
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305 | unsigned long irqflags; |
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306 | |||
307 | if (!dev->vblank_disable_allowed) |
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308 | return; |
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309 | |||
310 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
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311 | if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) { |
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312 | DRM_DEBUG("disabling vblank on crtc %u\n", pipe); |
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313 | vblank_disable_and_save(dev, pipe); |
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314 | } |
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315 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
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316 | } |
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317 | |||
318 | /** |
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319 | * drm_vblank_cleanup - cleanup vblank support |
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320 | * @dev: DRM device |
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321 | * |
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322 | * This function cleans up any resources allocated in drm_vblank_init. |
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323 | */ |
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324 | void drm_vblank_cleanup(struct drm_device *dev) |
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325 | { |
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326 | unsigned int pipe; |
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327 | |||
328 | /* Bail if the driver didn't call drm_vblank_init() */ |
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329 | if (dev->num_crtcs == 0) |
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330 | return; |
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331 | |||
332 | for (pipe = 0; pipe < dev->num_crtcs; pipe++) { |
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333 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
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334 | |||
335 | WARN_ON(vblank->enabled && |
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336 | drm_core_check_feature(dev, DRIVER_MODESET)); |
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337 | |||
338 | del_timer_sync(&vblank->disable_timer); |
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339 | } |
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340 | |||
341 | kfree(dev->vblank); |
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342 | |||
343 | dev->num_crtcs = 0; |
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344 | } |
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345 | EXPORT_SYMBOL(drm_vblank_cleanup); |
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346 | |||
347 | /** |
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5060 | serge | 348 | * drm_vblank_init - initialize vblank support |
6084 | serge | 349 | * @dev: DRM device |
350 | * @num_crtcs: number of CRTCs supported by @dev |
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5060 | serge | 351 | * |
352 | * This function initializes vblank support for @num_crtcs display pipelines. |
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353 | * |
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354 | * Returns: |
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355 | * Zero on success or a negative error code on failure. |
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356 | */ |
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6084 | serge | 357 | int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs) |
5060 | serge | 358 | { |
6084 | serge | 359 | int ret = -ENOMEM; |
360 | unsigned int i; |
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5060 | serge | 361 | |
362 | spin_lock_init(&dev->vbl_lock); |
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363 | spin_lock_init(&dev->vblank_time_lock); |
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364 | |||
365 | dev->num_crtcs = num_crtcs; |
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366 | |||
367 | dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL); |
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368 | if (!dev->vblank) |
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369 | goto err; |
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370 | |||
371 | for (i = 0; i < num_crtcs; i++) { |
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5271 | serge | 372 | struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
373 | |||
374 | vblank->dev = dev; |
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6084 | serge | 375 | vblank->pipe = i; |
5271 | serge | 376 | init_waitqueue_head(&vblank->queue); |
6088 | serge | 377 | setup_timer(&vblank->disable_timer, vblank_disable_fn, |
378 | (unsigned long)vblank); |
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5060 | serge | 379 | } |
380 | |||
381 | DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n"); |
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382 | |||
383 | /* Driver specific high-precision vblank timestamping supported? */ |
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384 | if (dev->driver->get_vblank_timestamp) |
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385 | DRM_INFO("Driver supports precise vblank timestamp query.\n"); |
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386 | else |
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387 | DRM_INFO("No driver support for vblank timestamp query.\n"); |
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388 | |||
6084 | serge | 389 | /* Must have precise timestamping for reliable vblank instant disable */ |
390 | if (dev->vblank_disable_immediate && !dev->driver->get_vblank_timestamp) { |
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391 | dev->vblank_disable_immediate = false; |
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392 | DRM_INFO("Setting vblank_disable_immediate to false because " |
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393 | "get_vblank_timestamp == NULL\n"); |
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394 | } |
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395 | |||
5060 | serge | 396 | dev->vblank_disable_allowed = false; |
397 | |||
398 | return 0; |
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399 | |||
400 | err: |
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5271 | serge | 401 | dev->num_crtcs = 0; |
5060 | serge | 402 | return ret; |
403 | } |
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404 | EXPORT_SYMBOL(drm_vblank_init); |
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405 | |||
406 | |||
6084 | serge | 407 | |
4075 | Serge | 408 | |
409 | /** |
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5060 | serge | 410 | * drm_irq_install - install IRQ handler |
411 | * @dev: DRM device |
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412 | * @irq: IRQ number to install the handler for |
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4075 | Serge | 413 | * |
5060 | serge | 414 | * Initializes the IRQ related data. Installs the handler, calling the driver |
415 | * irq_preinstall() and irq_postinstall() functions before and after the |
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416 | * installation. |
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4075 | Serge | 417 | * |
5060 | serge | 418 | * This is the simplified helper interface provided for drivers with no special |
419 | * needs. Drivers which need to install interrupt handlers for multiple |
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420 | * interrupts must instead set drm_device->irq_enabled to signal the DRM core |
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421 | * that vblank interrupts are available. |
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422 | * |
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423 | * Returns: |
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424 | * Zero on success or a negative error code on failure. |
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4075 | Serge | 425 | */ |
5060 | serge | 426 | int drm_irq_install(struct drm_device *dev, int irq) |
4075 | Serge | 427 | { |
428 | int ret; |
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6084 | serge | 429 | unsigned long sh_flags = 0; |
4075 | Serge | 430 | |
4293 | Serge | 431 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
432 | return -EINVAL; |
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4075 | Serge | 433 | |
5060 | serge | 434 | if (irq == 0) |
4075 | Serge | 435 | return -EINVAL; |
436 | |||
6084 | serge | 437 | /* Driver must have been initialized */ |
5060 | serge | 438 | if (!dev->dev_private) |
6084 | serge | 439 | return -EINVAL; |
4075 | Serge | 440 | |
5060 | serge | 441 | if (dev->irq_enabled) |
6084 | serge | 442 | return -EBUSY; |
4560 | Serge | 443 | dev->irq_enabled = true; |
4075 | Serge | 444 | |
5060 | serge | 445 | DRM_DEBUG("irq=%d\n", irq); |
4075 | Serge | 446 | |
6084 | serge | 447 | /* Before installing handler */ |
448 | if (dev->driver->irq_preinstall) |
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449 | dev->driver->irq_preinstall(dev); |
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4075 | Serge | 450 | |
5060 | serge | 451 | ret = !AttachIntHandler(irq, device_irq_handler, (u32)dev); |
4075 | Serge | 452 | |
6084 | serge | 453 | /* After installing handler */ |
454 | if (dev->driver->irq_postinstall) |
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455 | ret = dev->driver->irq_postinstall(dev); |
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4075 | Serge | 456 | |
6084 | serge | 457 | if (ret < 0) { |
5060 | serge | 458 | dev->irq_enabled = false; |
459 | } else { |
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460 | dev->irq = irq; |
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6084 | serge | 461 | } |
4075 | Serge | 462 | |
5271 | serge | 463 | u16 cmd = PciRead16(dev->pdev->busnr, dev->pdev->devfn, 4); |
4075 | Serge | 464 | cmd&= ~(1<<10); |
465 | PciWrite16(dev->pdev->busnr, dev->pdev->devfn, 4, cmd); |
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466 | |||
467 | return ret; |
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468 | } |
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469 | EXPORT_SYMBOL(drm_irq_install); |
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470 | |||
471 | |||
1963 | serge | 472 | |
473 | |||
474 | |||
475 | /** |
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5060 | serge | 476 | * drm_calc_timestamping_constants - calculate vblank timestamp constants |
477 | * @crtc: drm_crtc whose timestamp constants should be updated. |
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478 | * @mode: display mode containing the scanout timings |
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1963 | serge | 479 | * |
4560 | Serge | 480 | * Calculate and store various constants which are later |
481 | * needed by vblank and swap-completion timestamping, e.g, |
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482 | * by drm_calc_vbltimestamp_from_scanoutpos(). They are |
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5060 | serge | 483 | * derived from CRTC's true scanout timing, so they take |
4560 | Serge | 484 | * things like panel scaling or other adjustments into account. |
1963 | serge | 485 | */ |
4560 | Serge | 486 | void drm_calc_timestamping_constants(struct drm_crtc *crtc, |
487 | const struct drm_display_mode *mode) |
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1963 | serge | 488 | { |
6084 | serge | 489 | struct drm_device *dev = crtc->dev; |
490 | unsigned int pipe = drm_crtc_index(crtc); |
||
491 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
492 | int linedur_ns = 0, framedur_ns = 0; |
||
4560 | Serge | 493 | int dotclock = mode->crtc_clock; |
1963 | serge | 494 | |
6084 | serge | 495 | if (!dev->num_crtcs) |
496 | return; |
||
497 | |||
498 | if (WARN_ON(pipe >= dev->num_crtcs)) |
||
499 | return; |
||
500 | |||
4560 | Serge | 501 | /* Valid dotclock? */ |
502 | if (dotclock > 0) { |
||
503 | int frame_size = mode->crtc_htotal * mode->crtc_vtotal; |
||
1963 | serge | 504 | |
4560 | Serge | 505 | /* |
506 | * Convert scanline length in pixels and video |
||
6084 | serge | 507 | * dot clock to line duration and frame duration |
508 | * in nanoseconds: |
||
509 | */ |
||
4560 | Serge | 510 | linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock); |
511 | framedur_ns = div_u64((u64) frame_size * 1000000, dotclock); |
||
1963 | serge | 512 | |
4560 | Serge | 513 | /* |
514 | * Fields of interlaced scanout modes are only half a frame duration. |
||
1963 | serge | 515 | */ |
4560 | Serge | 516 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) |
517 | framedur_ns /= 2; |
||
1963 | serge | 518 | } else |
6084 | serge | 519 | DRM_ERROR("crtc %u: Can't calculate constants, dotclock = 0!\n", |
1963 | serge | 520 | crtc->base.id); |
521 | |||
6084 | serge | 522 | vblank->linedur_ns = linedur_ns; |
523 | vblank->framedur_ns = framedur_ns; |
||
1963 | serge | 524 | |
6084 | serge | 525 | DRM_DEBUG("crtc %u: hwmode: htotal %d, vtotal %d, vdisplay %d\n", |
4560 | Serge | 526 | crtc->base.id, mode->crtc_htotal, |
527 | mode->crtc_vtotal, mode->crtc_vdisplay); |
||
6084 | serge | 528 | DRM_DEBUG("crtc %u: clock %d kHz framedur %d linedur %d\n", |
529 | crtc->base.id, dotclock, framedur_ns, linedur_ns); |
||
1963 | serge | 530 | } |
4293 | Serge | 531 | EXPORT_SYMBOL(drm_calc_timestamping_constants); |
1963 | serge | 532 | |
4293 | Serge | 533 | /** |
5060 | serge | 534 | * drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper |
535 | * @dev: DRM device |
||
6084 | serge | 536 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
5060 | serge | 537 | * @max_error: Desired maximum allowable error in timestamps (nanosecs) |
538 | * On return contains true maximum error of timestamp |
||
539 | * @vblank_time: Pointer to struct timeval which should receive the timestamp |
||
540 | * @flags: Flags to pass to driver: |
||
541 | * 0 = Default, |
||
542 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler |
||
543 | * @mode: mode which defines the scanout timings |
||
4293 | Serge | 544 | * |
5060 | serge | 545 | * Implements calculation of exact vblank timestamps from given drm_display_mode |
546 | * timings and current video scanout position of a CRTC. This can be called from |
||
547 | * within get_vblank_timestamp() implementation of a kms driver to implement the |
||
548 | * actual timestamping. |
||
549 | * |
||
4293 | Serge | 550 | * Should return timestamps conforming to the OML_sync_control OpenML |
551 | * extension specification. The timestamp corresponds to the end of |
||
552 | * the vblank interval, aka start of scanout of topmost-leftmost display |
||
553 | * pixel in the following video frame. |
||
554 | * |
||
555 | * Requires support for optional dev->driver->get_scanout_position() |
||
556 | * in kms driver, plus a bit of setup code to provide a drm_display_mode |
||
557 | * that corresponds to the true scanout timing. |
||
558 | * |
||
559 | * The current implementation only handles standard video modes. It |
||
560 | * returns as no operation if a doublescan or interlaced video mode is |
||
561 | * active. Higher level code is expected to handle this. |
||
562 | * |
||
5060 | serge | 563 | * Returns: |
564 | * Negative value on error, failure or if not supported in current |
||
4293 | Serge | 565 | * video mode: |
566 | * |
||
5060 | serge | 567 | * -EINVAL - Invalid CRTC. |
4293 | Serge | 568 | * -EAGAIN - Temporary unavailable, e.g., called before initial modeset. |
569 | * -ENOTSUPP - Function not supported in current display mode. |
||
570 | * -EIO - Failed, e.g., due to failed scanout position query. |
||
571 | * |
||
572 | * Returns or'ed positive status flags on success: |
||
573 | * |
||
574 | * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping. |
||
575 | * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval. |
||
576 | * |
||
577 | */ |
||
6084 | serge | 578 | int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, |
579 | unsigned int pipe, |
||
4293 | Serge | 580 | int *max_error, |
581 | struct timeval *vblank_time, |
||
582 | unsigned flags, |
||
4560 | Serge | 583 | const struct drm_display_mode *mode) |
4293 | Serge | 584 | { |
585 | struct timeval tv_etime; |
||
6084 | serge | 586 | ktime_t stime, etime; |
587 | unsigned int vbl_status; |
||
588 | int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD; |
||
4293 | Serge | 589 | int vpos, hpos, i; |
6084 | serge | 590 | int delta_ns, duration_ns; |
3031 | serge | 591 | |
6084 | serge | 592 | if (pipe >= dev->num_crtcs) { |
593 | DRM_ERROR("Invalid crtc %u\n", pipe); |
||
4293 | Serge | 594 | return -EINVAL; |
595 | } |
||
596 | |||
597 | /* Scanout position query not supported? Should not happen. */ |
||
598 | if (!dev->driver->get_scanout_position) { |
||
599 | DRM_ERROR("Called from driver w/o get_scanout_position()!?\n"); |
||
600 | return -EIO; |
||
601 | } |
||
602 | |||
603 | /* If mode timing undefined, just return as no-op: |
||
604 | * Happens during initial modesetting of a crtc. |
||
605 | */ |
||
6084 | serge | 606 | if (mode->crtc_clock == 0) { |
607 | DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe); |
||
4293 | Serge | 608 | return -EAGAIN; |
609 | } |
||
610 | |||
6084 | serge | 611 | /* Get current scanout position with system timestamp. |
612 | * Repeat query up to DRM_TIMESTAMP_MAXRETRIES times |
||
613 | * if single query takes longer than max_error nanoseconds. |
||
614 | * |
||
615 | * This guarantees a tight bound on maximum error if |
||
616 | * code gets preempted or delayed for some reason. |
||
617 | */ |
||
618 | for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) { |
||
619 | /* |
||
620 | * Get vertical and horizontal scanout position vpos, hpos, |
||
621 | * and bounding timestamps stime, etime, pre/post query. |
||
622 | */ |
||
623 | vbl_status = dev->driver->get_scanout_position(dev, pipe, flags, |
||
624 | &vpos, &hpos, |
||
625 | &stime, &etime, |
||
626 | mode); |
||
627 | |||
628 | /* Return as no-op if scanout query unsupported or failed. */ |
||
629 | if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { |
||
630 | DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n", |
||
631 | pipe, vbl_status); |
||
632 | return -EIO; |
||
633 | } |
||
634 | |||
635 | /* Compute uncertainty in timestamp of scanout position query. */ |
||
636 | duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime); |
||
637 | |||
638 | /* Accept result with < max_error nsecs timing uncertainty. */ |
||
639 | if (duration_ns <= *max_error) |
||
640 | break; |
||
641 | } |
||
642 | |||
643 | /* Noisy system timing? */ |
||
644 | if (i == DRM_TIMESTAMP_MAXRETRIES) { |
||
645 | DRM_DEBUG("crtc %u: Noisy timestamp %d us > %d us [%d reps].\n", |
||
646 | pipe, duration_ns/1000, *max_error/1000, i); |
||
647 | } |
||
648 | |||
649 | /* Return upper bound of timestamp precision error. */ |
||
650 | *max_error = duration_ns; |
||
651 | |||
652 | /* Check if in vblank area: |
||
653 | * vpos is >=0 in video scanout area, but negative |
||
654 | * within vblank area, counting down the number of lines until |
||
655 | * start of scanout. |
||
656 | */ |
||
657 | if (vbl_status & DRM_SCANOUTPOS_IN_VBLANK) |
||
658 | ret |= DRM_VBLANKTIME_IN_VBLANK; |
||
659 | |||
660 | /* Convert scanout position into elapsed time at raw_time query |
||
661 | * since start of scanout at first display scanline. delta_ns |
||
662 | * can be negative if start of scanout hasn't happened yet. |
||
663 | */ |
||
664 | delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), |
||
665 | mode->crtc_clock); |
||
666 | |||
667 | if (!drm_timestamp_monotonic) |
||
668 | etime = ktime_mono_to_real(etime); |
||
669 | |||
670 | /* save this only for debugging purposes */ |
||
671 | tv_etime = ktime_to_timeval(etime); |
||
672 | /* Subtract time delta from raw timestamp to get final |
||
673 | * vblank_time timestamp for end of vblank. |
||
674 | */ |
||
675 | if (delta_ns < 0) |
||
676 | etime = ktime_add_ns(etime, -delta_ns); |
||
677 | else |
||
678 | etime = ktime_sub_ns(etime, delta_ns); |
||
679 | *vblank_time = ktime_to_timeval(etime); |
||
680 | |||
681 | DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n", |
||
682 | pipe, vbl_status, hpos, vpos, |
||
683 | (long)tv_etime.tv_sec, (long)tv_etime.tv_usec, |
||
684 | (long)vblank_time->tv_sec, (long)vblank_time->tv_usec, |
||
685 | duration_ns/1000, i); |
||
686 | |||
687 | return ret; |
||
4293 | Serge | 688 | } |
689 | EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos); |
||
690 | |||
6084 | serge | 691 | static struct timeval get_drm_timestamp(void) |
692 | { |
||
693 | ktime_t now; |
||
694 | |||
695 | now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); |
||
696 | return ktime_to_timeval(now); |
||
697 | } |
||
698 | |||
5060 | serge | 699 | /** |
6084 | serge | 700 | * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent |
701 | * vblank interval |
||
702 | * @dev: DRM device |
||
703 | * @pipe: index of CRTC whose vblank timestamp to retrieve |
||
704 | * @tvblank: Pointer to target struct timeval which should receive the timestamp |
||
705 | * @flags: Flags to pass to driver: |
||
706 | * 0 = Default, |
||
707 | * DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler |
||
708 | * |
||
709 | * Fetches the system timestamp corresponding to the time of the most recent |
||
710 | * vblank interval on specified CRTC. May call into kms-driver to |
||
711 | * compute the timestamp with a high-precision GPU specific method. |
||
712 | * |
||
713 | * Returns zero if timestamp originates from uncorrected do_gettimeofday() |
||
714 | * call, i.e., it isn't very precisely locked to the true vblank. |
||
715 | * |
||
716 | * Returns: |
||
717 | * True if timestamp is considered to be very precise, false otherwise. |
||
718 | */ |
||
719 | static bool |
||
720 | drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe, |
||
721 | struct timeval *tvblank, unsigned flags) |
||
722 | { |
||
723 | int ret; |
||
724 | |||
725 | /* Define requested maximum error on timestamps (nanoseconds). */ |
||
726 | int max_error = (int) drm_timestamp_precision * 1000; |
||
727 | |||
728 | /* Query driver if possible and precision timestamping enabled. */ |
||
729 | if (dev->driver->get_vblank_timestamp && (max_error > 0)) { |
||
730 | ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error, |
||
731 | tvblank, flags); |
||
732 | if (ret > 0) |
||
733 | return true; |
||
734 | } |
||
735 | |||
736 | /* GPU high precision timestamp query unsupported or failed. |
||
737 | * Return current monotonic/gettimeofday timestamp as best estimate. |
||
738 | */ |
||
739 | *tvblank = get_drm_timestamp(); |
||
740 | |||
741 | return false; |
||
742 | } |
||
743 | |||
744 | /** |
||
745 | * drm_vblank_count - retrieve "cooked" vblank counter value |
||
746 | * @dev: DRM device |
||
747 | * @pipe: index of CRTC for which to retrieve the counter |
||
748 | * |
||
749 | * Fetches the "cooked" vblank count value that represents the number of |
||
750 | * vblank events since the system was booted, including lost events due to |
||
751 | * modesetting activity. |
||
752 | * |
||
753 | * This is the legacy version of drm_crtc_vblank_count(). |
||
754 | * |
||
755 | * Returns: |
||
756 | * The software vblank counter. |
||
757 | */ |
||
758 | u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe) |
||
759 | { |
||
760 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
761 | |||
762 | if (WARN_ON(pipe >= dev->num_crtcs)) |
||
763 | return 0; |
||
764 | |||
765 | return vblank->count; |
||
766 | } |
||
767 | EXPORT_SYMBOL(drm_vblank_count); |
||
768 | |||
769 | /** |
||
770 | * drm_crtc_vblank_count - retrieve "cooked" vblank counter value |
||
771 | * @crtc: which counter to retrieve |
||
772 | * |
||
773 | * Fetches the "cooked" vblank count value that represents the number of |
||
774 | * vblank events since the system was booted, including lost events due to |
||
775 | * modesetting activity. |
||
776 | * |
||
777 | * This is the native KMS version of drm_vblank_count(). |
||
778 | * |
||
779 | * Returns: |
||
780 | * The software vblank counter. |
||
781 | */ |
||
782 | u32 drm_crtc_vblank_count(struct drm_crtc *crtc) |
||
783 | { |
||
784 | return drm_vblank_count(crtc->dev, drm_crtc_index(crtc)); |
||
785 | } |
||
786 | EXPORT_SYMBOL(drm_crtc_vblank_count); |
||
787 | |||
788 | /** |
||
789 | * drm_vblank_count_and_time - retrieve "cooked" vblank counter value and the |
||
790 | * system timestamp corresponding to that vblank counter value. |
||
791 | * @dev: DRM device |
||
792 | * @pipe: index of CRTC whose counter to retrieve |
||
793 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
||
794 | * |
||
795 | * Fetches the "cooked" vblank count value that represents the number of |
||
796 | * vblank events since the system was booted, including lost events due to |
||
797 | * modesetting activity. Returns corresponding system timestamp of the time |
||
798 | * of the vblank interval that corresponds to the current vblank counter value. |
||
799 | * |
||
800 | * This is the legacy version of drm_crtc_vblank_count_and_time(). |
||
801 | */ |
||
802 | u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe, |
||
803 | struct timeval *vblanktime) |
||
804 | { |
||
805 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
806 | int count = DRM_TIMESTAMP_MAXRETRIES; |
||
807 | u32 cur_vblank; |
||
808 | |||
809 | if (WARN_ON(pipe >= dev->num_crtcs)) |
||
810 | return 0; |
||
811 | |||
812 | /* |
||
813 | * Vblank timestamps are read lockless. To ensure consistency the vblank |
||
814 | * counter is rechecked and ordering is ensured using memory barriers. |
||
815 | * This works like a seqlock. The write-side barriers are in store_vblank. |
||
816 | */ |
||
817 | do { |
||
818 | cur_vblank = vblank->count; |
||
819 | smp_rmb(); |
||
820 | *vblanktime = vblanktimestamp(dev, pipe, cur_vblank); |
||
821 | smp_rmb(); |
||
822 | } while (cur_vblank != vblank->count && --count > 0); |
||
823 | |||
824 | return cur_vblank; |
||
825 | } |
||
826 | EXPORT_SYMBOL(drm_vblank_count_and_time); |
||
6088 | serge | 827 | |
6084 | serge | 828 | /** |
6088 | serge | 829 | * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value |
830 | * and the system timestamp corresponding to that vblank counter value |
||
831 | * @crtc: which counter to retrieve |
||
832 | * @vblanktime: Pointer to struct timeval to receive the vblank timestamp. |
||
833 | * |
||
834 | * Fetches the "cooked" vblank count value that represents the number of |
||
835 | * vblank events since the system was booted, including lost events due to |
||
836 | * modesetting activity. Returns corresponding system timestamp of the time |
||
837 | * of the vblank interval that corresponds to the current vblank counter value. |
||
838 | * |
||
839 | * This is the native KMS version of drm_vblank_count_and_time(). |
||
840 | */ |
||
841 | u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc, |
||
842 | struct timeval *vblanktime) |
||
843 | { |
||
844 | return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc), |
||
845 | vblanktime); |
||
846 | } |
||
847 | EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); |
||
848 | |||
849 | static void send_vblank_event(struct drm_device *dev, |
||
850 | struct drm_pending_vblank_event *e, |
||
851 | unsigned long seq, struct timeval *now) |
||
852 | { |
||
853 | assert_spin_locked(&dev->event_lock); |
||
854 | |||
855 | e->event.sequence = seq; |
||
856 | e->event.tv_sec = now->tv_sec; |
||
857 | e->event.tv_usec = now->tv_usec; |
||
858 | |||
859 | list_add_tail(&e->base.link, |
||
860 | &e->base.file_priv->event_list); |
||
861 | wake_up_interruptible(&e->base.file_priv->event_wait); |
||
862 | } |
||
863 | |||
864 | /** |
||
865 | * drm_arm_vblank_event - arm vblank event after pageflip |
||
866 | * @dev: DRM device |
||
867 | * @pipe: CRTC index |
||
868 | * @e: the event to prepare to send |
||
869 | * |
||
870 | * A lot of drivers need to generate vblank events for the very next vblank |
||
871 | * interrupt. For example when the page flip interrupt happens when the page |
||
872 | * flip gets armed, but not when it actually executes within the next vblank |
||
873 | * period. This helper function implements exactly the required vblank arming |
||
874 | * behaviour. |
||
875 | * |
||
876 | * Caller must hold event lock. Caller must also hold a vblank reference for |
||
877 | * the event @e, which will be dropped when the next vblank arrives. |
||
878 | * |
||
879 | * This is the legacy version of drm_crtc_arm_vblank_event(). |
||
880 | */ |
||
881 | void drm_arm_vblank_event(struct drm_device *dev, unsigned int pipe, |
||
882 | struct drm_pending_vblank_event *e) |
||
883 | { |
||
884 | assert_spin_locked(&dev->event_lock); |
||
885 | |||
886 | e->pipe = pipe; |
||
887 | e->event.sequence = drm_vblank_count(dev, pipe); |
||
888 | list_add_tail(&e->base.link, &dev->vblank_event_list); |
||
889 | } |
||
890 | EXPORT_SYMBOL(drm_arm_vblank_event); |
||
891 | |||
892 | /** |
||
893 | * drm_crtc_arm_vblank_event - arm vblank event after pageflip |
||
894 | * @crtc: the source CRTC of the vblank event |
||
895 | * @e: the event to send |
||
896 | * |
||
897 | * A lot of drivers need to generate vblank events for the very next vblank |
||
898 | * interrupt. For example when the page flip interrupt happens when the page |
||
899 | * flip gets armed, but not when it actually executes within the next vblank |
||
900 | * period. This helper function implements exactly the required vblank arming |
||
901 | * behaviour. |
||
902 | * |
||
903 | * Caller must hold event lock. Caller must also hold a vblank reference for |
||
904 | * the event @e, which will be dropped when the next vblank arrives. |
||
905 | * |
||
906 | * This is the native KMS version of drm_arm_vblank_event(). |
||
907 | */ |
||
908 | void drm_crtc_arm_vblank_event(struct drm_crtc *crtc, |
||
909 | struct drm_pending_vblank_event *e) |
||
910 | { |
||
911 | drm_arm_vblank_event(crtc->dev, drm_crtc_index(crtc), e); |
||
912 | } |
||
913 | EXPORT_SYMBOL(drm_crtc_arm_vblank_event); |
||
914 | |||
915 | /** |
||
916 | * drm_send_vblank_event - helper to send vblank event after pageflip |
||
917 | * @dev: DRM device |
||
918 | * @pipe: CRTC index |
||
919 | * @e: the event to send |
||
920 | * |
||
921 | * Updates sequence # and timestamp on event, and sends it to userspace. |
||
922 | * Caller must hold event lock. |
||
923 | * |
||
924 | * This is the legacy version of drm_crtc_send_vblank_event(). |
||
925 | */ |
||
926 | void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe, |
||
927 | struct drm_pending_vblank_event *e) |
||
928 | { |
||
929 | struct timeval now; |
||
930 | unsigned int seq; |
||
931 | |||
932 | if (dev->num_crtcs > 0) { |
||
933 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
||
934 | } else { |
||
935 | seq = 0; |
||
936 | |||
937 | now = get_drm_timestamp(); |
||
938 | } |
||
939 | e->pipe = pipe; |
||
940 | send_vblank_event(dev, e, seq, &now); |
||
941 | } |
||
942 | EXPORT_SYMBOL(drm_send_vblank_event); |
||
943 | |||
944 | /** |
||
945 | * drm_crtc_send_vblank_event - helper to send vblank event after pageflip |
||
946 | * @crtc: the source CRTC of the vblank event |
||
947 | * @e: the event to send |
||
948 | * |
||
949 | * Updates sequence # and timestamp on event, and sends it to userspace. |
||
950 | * Caller must hold event lock. |
||
951 | * |
||
952 | * This is the native KMS version of drm_send_vblank_event(). |
||
953 | */ |
||
954 | void drm_crtc_send_vblank_event(struct drm_crtc *crtc, |
||
955 | struct drm_pending_vblank_event *e) |
||
956 | { |
||
957 | drm_send_vblank_event(crtc->dev, drm_crtc_index(crtc), e); |
||
958 | } |
||
959 | EXPORT_SYMBOL(drm_crtc_send_vblank_event); |
||
960 | |||
961 | /** |
||
6084 | serge | 962 | * drm_vblank_enable - enable the vblank interrupt on a CRTC |
963 | * @dev: DRM device |
||
964 | * @pipe: CRTC index |
||
965 | * |
||
966 | * Returns: |
||
967 | * Zero on success or a negative error code on failure. |
||
968 | */ |
||
969 | static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe) |
||
970 | { |
||
971 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
972 | int ret = 0; |
||
973 | |||
974 | assert_spin_locked(&dev->vbl_lock); |
||
975 | |||
976 | spin_lock(&dev->vblank_time_lock); |
||
977 | |||
978 | if (!vblank->enabled) { |
||
979 | /* |
||
980 | * Enable vblank irqs under vblank_time_lock protection. |
||
981 | * All vblank count & timestamp updates are held off |
||
982 | * until we are done reinitializing master counter and |
||
983 | * timestamps. Filtercode in drm_handle_vblank() will |
||
984 | * prevent double-accounting of same vblank interval. |
||
985 | */ |
||
986 | ret = dev->driver->enable_vblank(dev, pipe); |
||
987 | DRM_DEBUG("enabling vblank on crtc %u, ret: %d\n", pipe, ret); |
||
988 | if (ret) |
||
989 | atomic_dec(&vblank->refcount); |
||
990 | else { |
||
991 | vblank->enabled = true; |
||
992 | drm_update_vblank_count(dev, pipe, 0); |
||
993 | } |
||
994 | } |
||
995 | |||
996 | spin_unlock(&dev->vblank_time_lock); |
||
997 | |||
998 | return ret; |
||
999 | } |
||
1000 | |||
1001 | /** |
||
5271 | serge | 1002 | * drm_vblank_get - get a reference count on vblank events |
1003 | * @dev: DRM device |
||
6084 | serge | 1004 | * @pipe: index of CRTC to own |
5271 | serge | 1005 | * |
1006 | * Acquire a reference count on vblank events to avoid having them disabled |
||
1007 | * while in use. |
||
1008 | * |
||
1009 | * This is the legacy version of drm_crtc_vblank_get(). |
||
1010 | * |
||
1011 | * Returns: |
||
6084 | serge | 1012 | * Zero on success or a negative error code on failure. |
5271 | serge | 1013 | */ |
6084 | serge | 1014 | int drm_vblank_get(struct drm_device *dev, unsigned int pipe) |
5271 | serge | 1015 | { |
6084 | serge | 1016 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5271 | serge | 1017 | unsigned long irqflags; |
1018 | int ret = 0; |
||
1019 | |||
6084 | serge | 1020 | if (!dev->num_crtcs) |
5271 | serge | 1021 | return -EINVAL; |
1022 | |||
6084 | serge | 1023 | if (WARN_ON(pipe >= dev->num_crtcs)) |
1024 | return -EINVAL; |
||
1025 | |||
5271 | serge | 1026 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
1027 | /* Going from 0->1 means we have to enable interrupts again */ |
||
1028 | if (atomic_add_return(1, &vblank->refcount) == 1) { |
||
6084 | serge | 1029 | ret = drm_vblank_enable(dev, pipe); |
5271 | serge | 1030 | } else { |
1031 | if (!vblank->enabled) { |
||
1032 | atomic_dec(&vblank->refcount); |
||
1033 | ret = -EINVAL; |
||
1034 | } |
||
1035 | } |
||
1036 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
||
6084 | serge | 1037 | |
5271 | serge | 1038 | return ret; |
1039 | } |
||
1040 | EXPORT_SYMBOL(drm_vblank_get); |
||
1041 | |||
1042 | /** |
||
1043 | * drm_crtc_vblank_get - get a reference count on vblank events |
||
1044 | * @crtc: which CRTC to own |
||
1045 | * |
||
1046 | * Acquire a reference count on vblank events to avoid having them disabled |
||
1047 | * while in use. |
||
1048 | * |
||
6084 | serge | 1049 | * This is the native kms version of drm_vblank_get(). |
5271 | serge | 1050 | * |
1051 | * Returns: |
||
6084 | serge | 1052 | * Zero on success or a negative error code on failure. |
5271 | serge | 1053 | */ |
1054 | int drm_crtc_vblank_get(struct drm_crtc *crtc) |
||
1055 | { |
||
1056 | return drm_vblank_get(crtc->dev, drm_crtc_index(crtc)); |
||
1057 | } |
||
1058 | EXPORT_SYMBOL(drm_crtc_vblank_get); |
||
1059 | |||
1060 | /** |
||
6084 | serge | 1061 | * drm_vblank_put - release ownership of vblank events |
5271 | serge | 1062 | * @dev: DRM device |
6084 | serge | 1063 | * @pipe: index of CRTC to release |
5271 | serge | 1064 | * |
1065 | * Release ownership of a given vblank counter, turning off interrupts |
||
1066 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
||
1067 | * |
||
1068 | * This is the legacy version of drm_crtc_vblank_put(). |
||
1069 | */ |
||
6084 | serge | 1070 | void drm_vblank_put(struct drm_device *dev, unsigned int pipe) |
5271 | serge | 1071 | { |
6084 | serge | 1072 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5271 | serge | 1073 | |
6084 | serge | 1074 | if (WARN_ON(pipe >= dev->num_crtcs)) |
5271 | serge | 1075 | return; |
1076 | |||
6084 | serge | 1077 | if (WARN_ON(atomic_read(&vblank->refcount) == 0)) |
5271 | serge | 1078 | return; |
1079 | |||
1080 | /* Last user schedules interrupt disable */ |
||
1081 | if (atomic_dec_and_test(&vblank->refcount)) { |
||
1082 | if (drm_vblank_offdelay == 0) |
||
1083 | return; |
||
6088 | serge | 1084 | else |
5271 | serge | 1085 | vblank_disable_fn((unsigned long)vblank); |
1086 | } |
||
1087 | } |
||
1088 | EXPORT_SYMBOL(drm_vblank_put); |
||
1089 | |||
1090 | /** |
||
1091 | * drm_crtc_vblank_put - give up ownership of vblank events |
||
1092 | * @crtc: which counter to give up |
||
1093 | * |
||
1094 | * Release ownership of a given vblank counter, turning off interrupts |
||
1095 | * if possible. Disable interrupts after drm_vblank_offdelay milliseconds. |
||
1096 | * |
||
1097 | * This is the native kms version of drm_vblank_put(). |
||
1098 | */ |
||
1099 | void drm_crtc_vblank_put(struct drm_crtc *crtc) |
||
1100 | { |
||
1101 | drm_vblank_put(crtc->dev, drm_crtc_index(crtc)); |
||
1102 | } |
||
1103 | EXPORT_SYMBOL(drm_crtc_vblank_put); |
||
1104 | |||
1105 | /** |
||
1106 | * drm_wait_one_vblank - wait for one vblank |
||
1107 | * @dev: DRM device |
||
6084 | serge | 1108 | * @pipe: CRTC index |
5271 | serge | 1109 | * |
6084 | serge | 1110 | * This waits for one vblank to pass on @pipe, using the irq driver interfaces. |
1111 | * It is a failure to call this when the vblank irq for @pipe is disabled, e.g. |
||
5271 | serge | 1112 | * due to lack of driver support or because the crtc is off. |
1113 | */ |
||
6084 | serge | 1114 | void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe) |
5271 | serge | 1115 | { |
6088 | serge | 1116 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5271 | serge | 1117 | int ret; |
1118 | u32 last; |
||
1119 | |||
6088 | serge | 1120 | if (WARN_ON(pipe >= dev->num_crtcs)) |
5271 | serge | 1121 | return; |
1122 | |||
6088 | serge | 1123 | ret = drm_vblank_get(dev, pipe); |
1124 | if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", pipe, ret)) |
||
1125 | return; |
||
5271 | serge | 1126 | |
6088 | serge | 1127 | last = drm_vblank_count(dev, pipe); |
1128 | |||
1129 | ret = wait_event_timeout(vblank->queue, |
||
1130 | last != drm_vblank_count(dev, pipe), |
||
5271 | serge | 1131 | msecs_to_jiffies(100)); |
1132 | |||
6088 | serge | 1133 | WARN(ret == 0, "vblank wait timed out on crtc %i\n", pipe); |
5271 | serge | 1134 | |
6088 | serge | 1135 | drm_vblank_put(dev, pipe); |
5271 | serge | 1136 | } |
1137 | EXPORT_SYMBOL(drm_wait_one_vblank); |
||
1138 | |||
1139 | /** |
||
1140 | * drm_crtc_wait_one_vblank - wait for one vblank |
||
1141 | * @crtc: DRM crtc |
||
1142 | * |
||
1143 | * This waits for one vblank to pass on @crtc, using the irq driver interfaces. |
||
1144 | * It is a failure to call this when the vblank irq for @crtc is disabled, e.g. |
||
1145 | * due to lack of driver support or because the crtc is off. |
||
1146 | */ |
||
1147 | void drm_crtc_wait_one_vblank(struct drm_crtc *crtc) |
||
1148 | { |
||
1149 | drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc)); |
||
1150 | } |
||
1151 | EXPORT_SYMBOL(drm_crtc_wait_one_vblank); |
||
1152 | |||
1153 | /** |
||
5060 | serge | 1154 | * drm_vblank_off - disable vblank events on a CRTC |
1155 | * @dev: DRM device |
||
6084 | serge | 1156 | * @pipe: CRTC index |
5060 | serge | 1157 | * |
1158 | * Drivers can use this function to shut down the vblank interrupt handling when |
||
1159 | * disabling a crtc. This function ensures that the latest vblank frame count is |
||
1160 | * stored so that drm_vblank_on() can restore it again. |
||
1161 | * |
||
1162 | * Drivers must use this function when the hardware vblank counter can get |
||
1163 | * reset, e.g. when suspending. |
||
1164 | * |
||
1165 | * This is the legacy version of drm_crtc_vblank_off(). |
||
1166 | */ |
||
6084 | serge | 1167 | void drm_vblank_off(struct drm_device *dev, unsigned int pipe) |
5060 | serge | 1168 | { |
6084 | serge | 1169 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5060 | serge | 1170 | struct drm_pending_vblank_event *e, *t; |
1171 | struct timeval now; |
||
1172 | unsigned long irqflags; |
||
1173 | unsigned int seq; |
||
4293 | Serge | 1174 | |
6088 | serge | 1175 | if (WARN_ON(pipe >= dev->num_crtcs)) |
1176 | return; |
||
5060 | serge | 1177 | |
6088 | serge | 1178 | spin_lock_irqsave(&dev->event_lock, irqflags); |
1179 | |||
1180 | spin_lock(&dev->vbl_lock); |
||
1181 | vblank_disable_and_save(dev, pipe); |
||
1182 | wake_up(&vblank->queue); |
||
1183 | |||
1184 | /* |
||
1185 | * Prevent subsequent drm_vblank_get() from re-enabling |
||
1186 | * the vblank interrupt by bumping the refcount. |
||
1187 | */ |
||
1188 | if (!vblank->inmodeset) { |
||
1189 | atomic_inc(&vblank->refcount); |
||
1190 | vblank->inmodeset = 1; |
||
1191 | } |
||
1192 | spin_unlock(&dev->vbl_lock); |
||
1193 | |||
1194 | /* Send any queued vblank events, lest the natives grow disquiet */ |
||
1195 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
||
1196 | |||
1197 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
||
1198 | if (e->pipe != pipe) |
||
1199 | continue; |
||
1200 | DRM_DEBUG("Sending premature vblank event on disable: " |
||
1201 | "wanted %d, current %d\n", |
||
1202 | e->event.sequence, seq); |
||
1203 | list_del(&e->base.link); |
||
1204 | drm_vblank_put(dev, pipe); |
||
1205 | send_vblank_event(dev, e, seq, &now); |
||
1206 | } |
||
1207 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
||
5060 | serge | 1208 | } |
1209 | EXPORT_SYMBOL(drm_vblank_off); |
||
1210 | |||
3031 | serge | 1211 | /** |
5060 | serge | 1212 | * drm_crtc_vblank_off - disable vblank events on a CRTC |
1213 | * @crtc: CRTC in question |
||
1214 | * |
||
1215 | * Drivers can use this function to shut down the vblank interrupt handling when |
||
1216 | * disabling a crtc. This function ensures that the latest vblank frame count is |
||
1217 | * stored so that drm_vblank_on can restore it again. |
||
1218 | * |
||
1219 | * Drivers must use this function when the hardware vblank counter can get |
||
1220 | * reset, e.g. when suspending. |
||
1221 | * |
||
1222 | * This is the native kms version of drm_vblank_off(). |
||
1223 | */ |
||
1224 | void drm_crtc_vblank_off(struct drm_crtc *crtc) |
||
1225 | { |
||
1226 | drm_vblank_off(crtc->dev, drm_crtc_index(crtc)); |
||
1227 | } |
||
1228 | EXPORT_SYMBOL(drm_crtc_vblank_off); |
||
1229 | |||
1230 | /** |
||
6084 | serge | 1231 | * drm_crtc_vblank_reset - reset vblank state to off on a CRTC |
1232 | * @crtc: CRTC in question |
||
1233 | * |
||
1234 | * Drivers can use this function to reset the vblank state to off at load time. |
||
1235 | * Drivers should use this together with the drm_crtc_vblank_off() and |
||
1236 | * drm_crtc_vblank_on() functions. The difference compared to |
||
1237 | * drm_crtc_vblank_off() is that this function doesn't save the vblank counter |
||
1238 | * and hence doesn't need to call any driver hooks. |
||
1239 | */ |
||
1240 | void drm_crtc_vblank_reset(struct drm_crtc *crtc) |
||
1241 | { |
||
1242 | struct drm_device *dev = crtc->dev; |
||
1243 | unsigned long irqflags; |
||
1244 | unsigned int pipe = drm_crtc_index(crtc); |
||
1245 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
1246 | |||
1247 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
||
1248 | /* |
||
1249 | * Prevent subsequent drm_vblank_get() from enabling the vblank |
||
1250 | * interrupt by bumping the refcount. |
||
1251 | */ |
||
1252 | if (!vblank->inmodeset) { |
||
1253 | atomic_inc(&vblank->refcount); |
||
1254 | vblank->inmodeset = 1; |
||
1255 | } |
||
1256 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
||
1257 | |||
1258 | WARN_ON(!list_empty(&dev->vblank_event_list)); |
||
1259 | } |
||
1260 | EXPORT_SYMBOL(drm_crtc_vblank_reset); |
||
1261 | |||
1262 | /** |
||
5060 | serge | 1263 | * drm_vblank_on - enable vblank events on a CRTC |
1264 | * @dev: DRM device |
||
6084 | serge | 1265 | * @pipe: CRTC index |
5060 | serge | 1266 | * |
1267 | * This functions restores the vblank interrupt state captured with |
||
1268 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and |
||
5271 | serge | 1269 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
5060 | serge | 1270 | * in driver load code to reflect the current hardware state of the crtc. |
1271 | * |
||
1272 | * This is the legacy version of drm_crtc_vblank_on(). |
||
1273 | */ |
||
6084 | serge | 1274 | void drm_vblank_on(struct drm_device *dev, unsigned int pipe) |
5060 | serge | 1275 | { |
6084 | serge | 1276 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5060 | serge | 1277 | unsigned long irqflags; |
1278 | |||
6084 | serge | 1279 | if (WARN_ON(pipe >= dev->num_crtcs)) |
1280 | return; |
||
1281 | |||
1282 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
||
1283 | /* Drop our private "prevent drm_vblank_get" refcount */ |
||
1284 | if (vblank->inmodeset) { |
||
1285 | atomic_dec(&vblank->refcount); |
||
1286 | vblank->inmodeset = 0; |
||
1287 | } |
||
1288 | |||
1289 | drm_reset_vblank_timestamp(dev, pipe); |
||
1290 | |||
1291 | /* |
||
1292 | * re-enable interrupts if there are users left, or the |
||
1293 | * user wishes vblank interrupts to be enabled all the time. |
||
1294 | */ |
||
1295 | if (atomic_read(&vblank->refcount) != 0 || |
||
1296 | (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0)) |
||
1297 | WARN_ON(drm_vblank_enable(dev, pipe)); |
||
1298 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
||
5060 | serge | 1299 | } |
1300 | EXPORT_SYMBOL(drm_vblank_on); |
||
1301 | |||
1302 | /** |
||
1303 | * drm_crtc_vblank_on - enable vblank events on a CRTC |
||
1304 | * @crtc: CRTC in question |
||
1305 | * |
||
1306 | * This functions restores the vblank interrupt state captured with |
||
1307 | * drm_vblank_off() again. Note that calls to drm_vblank_on() and |
||
5271 | serge | 1308 | * drm_vblank_off() can be unbalanced and so can also be unconditionally called |
5060 | serge | 1309 | * in driver load code to reflect the current hardware state of the crtc. |
1310 | * |
||
1311 | * This is the native kms version of drm_vblank_on(). |
||
1312 | */ |
||
1313 | void drm_crtc_vblank_on(struct drm_crtc *crtc) |
||
1314 | { |
||
1315 | drm_vblank_on(crtc->dev, drm_crtc_index(crtc)); |
||
1316 | } |
||
1317 | EXPORT_SYMBOL(drm_crtc_vblank_on); |
||
1318 | |||
1319 | /** |
||
3031 | serge | 1320 | * drm_vblank_pre_modeset - account for vblanks across mode sets |
1321 | * @dev: DRM device |
||
6084 | serge | 1322 | * @pipe: CRTC index |
3031 | serge | 1323 | * |
1324 | * Account for vblank events across mode setting events, which will likely |
||
1325 | * reset the hardware frame counter. |
||
5060 | serge | 1326 | * |
1327 | * This is done by grabbing a temporary vblank reference to ensure that the |
||
1328 | * vblank interrupt keeps running across the modeset sequence. With this the |
||
1329 | * software-side vblank frame counting will ensure that there are no jumps or |
||
1330 | * discontinuities. |
||
1331 | * |
||
1332 | * Unfortunately this approach is racy and also doesn't work when the vblank |
||
1333 | * interrupt stops running, e.g. across system suspend resume. It is therefore |
||
1334 | * highly recommended that drivers use the newer drm_vblank_off() and |
||
1335 | * drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when |
||
1336 | * using "cooked" software vblank frame counters and not relying on any hardware |
||
1337 | * counters. |
||
1338 | * |
||
1339 | * Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc |
||
1340 | * again. |
||
3031 | serge | 1341 | */ |
6084 | serge | 1342 | void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe) |
3031 | serge | 1343 | { |
6084 | serge | 1344 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
5271 | serge | 1345 | |
6084 | serge | 1346 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1347 | if (!dev->num_crtcs) |
||
5271 | serge | 1348 | return; |
1349 | |||
6084 | serge | 1350 | if (WARN_ON(pipe >= dev->num_crtcs)) |
1351 | return; |
||
1352 | |||
1353 | /* |
||
1354 | * To avoid all the problems that might happen if interrupts |
||
1355 | * were enabled/disabled around or between these calls, we just |
||
1356 | * have the kernel take a reference on the CRTC (just once though |
||
1357 | * to avoid corrupting the count if multiple, mismatch calls occur), |
||
1358 | * so that interrupts remain enabled in the interim. |
||
1359 | */ |
||
5271 | serge | 1360 | if (!vblank->inmodeset) { |
1361 | vblank->inmodeset = 0x1; |
||
6084 | serge | 1362 | if (drm_vblank_get(dev, pipe) == 0) |
5271 | serge | 1363 | vblank->inmodeset |= 0x2; |
6084 | serge | 1364 | } |
3031 | serge | 1365 | } |
1366 | EXPORT_SYMBOL(drm_vblank_pre_modeset); |
||
1367 | |||
5060 | serge | 1368 | /** |
1369 | * drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes |
||
1370 | * @dev: DRM device |
||
6084 | serge | 1371 | * @pipe: CRTC index |
5060 | serge | 1372 | * |
1373 | * This function again drops the temporary vblank reference acquired in |
||
1374 | * drm_vblank_pre_modeset. |
||
1375 | */ |
||
6084 | serge | 1376 | void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe) |
3031 | serge | 1377 | { |
6084 | serge | 1378 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
1379 | unsigned long irqflags; |
||
3031 | serge | 1380 | |
4075 | Serge | 1381 | /* vblank is not initialized (IRQ not installed ?), or has been freed */ |
1382 | if (!dev->num_crtcs) |
||
1383 | return; |
||
1384 | |||
6084 | serge | 1385 | if (WARN_ON(pipe >= dev->num_crtcs)) |
1386 | return; |
||
1387 | |||
5271 | serge | 1388 | if (vblank->inmodeset) { |
6084 | serge | 1389 | spin_lock_irqsave(&dev->vbl_lock, irqflags); |
4560 | Serge | 1390 | dev->vblank_disable_allowed = true; |
6084 | serge | 1391 | spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
3031 | serge | 1392 | |
5271 | serge | 1393 | if (vblank->inmodeset & 0x2) |
6084 | serge | 1394 | drm_vblank_put(dev, pipe); |
3031 | serge | 1395 | |
5271 | serge | 1396 | vblank->inmodeset = 0; |
6084 | serge | 1397 | } |
3031 | serge | 1398 | } |
1399 | EXPORT_SYMBOL(drm_vblank_post_modeset); |
||
5271 | serge | 1400 | |
6088 | serge | 1401 | static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) |
1402 | { |
||
1403 | struct drm_pending_vblank_event *e, *t; |
||
1404 | struct timeval now; |
||
1405 | unsigned int seq; |
||
5271 | serge | 1406 | |
6088 | serge | 1407 | assert_spin_locked(&dev->event_lock); |
1408 | |||
1409 | seq = drm_vblank_count_and_time(dev, pipe, &now); |
||
1410 | |||
1411 | list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) { |
||
1412 | if (e->pipe != pipe) |
||
1413 | continue; |
||
1414 | if ((seq - e->event.sequence) > (1<<23)) |
||
1415 | continue; |
||
1416 | |||
1417 | DRM_DEBUG("vblank event on %d, current %d\n", |
||
1418 | e->event.sequence, seq); |
||
1419 | |||
1420 | list_del(&e->base.link); |
||
1421 | drm_vblank_put(dev, pipe); |
||
6131 | serge | 1422 | // send_vblank_event(dev, e, seq, &now); |
6088 | serge | 1423 | } |
1424 | |||
1425 | } |
||
1426 | |||
1427 | /** |
||
1428 | * drm_handle_vblank - handle a vblank event |
||
1429 | * @dev: DRM device |
||
1430 | * @pipe: index of CRTC where this event occurred |
||
1431 | * |
||
1432 | * Drivers should call this routine in their vblank interrupt handlers to |
||
1433 | * update the vblank counter and send any signals that may be pending. |
||
1434 | * |
||
1435 | * This is the legacy version of drm_crtc_handle_vblank(). |
||
1436 | */ |
||
1437 | bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe) |
||
1438 | { |
||
1439 | struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; |
||
1440 | unsigned long irqflags; |
||
1441 | |||
1442 | if (WARN_ON_ONCE(!dev->num_crtcs)) |
||
1443 | return false; |
||
1444 | |||
1445 | if (WARN_ON(pipe >= dev->num_crtcs)) |
||
1446 | return false; |
||
1447 | |||
1448 | spin_lock_irqsave(&dev->event_lock, irqflags); |
||
1449 | |||
1450 | /* Need timestamp lock to prevent concurrent execution with |
||
1451 | * vblank enable/disable, as this would cause inconsistent |
||
1452 | * or corrupted timestamps and vblank counts. |
||
1453 | */ |
||
1454 | spin_lock(&dev->vblank_time_lock); |
||
1455 | |||
1456 | /* Vblank irq handling disabled. Nothing to do. */ |
||
1457 | if (!vblank->enabled) { |
||
1458 | spin_unlock(&dev->vblank_time_lock); |
||
1459 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
||
1460 | return false; |
||
1461 | } |
||
1462 | |||
1463 | drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ); |
||
1464 | |||
1465 | spin_unlock(&dev->vblank_time_lock); |
||
1466 | |||
1467 | wake_up(&vblank->queue); |
||
1468 | drm_handle_vblank_events(dev, pipe); |
||
1469 | |||
1470 | spin_unlock_irqrestore(&dev->event_lock, irqflags); |
||
1471 | |||
1472 | return true; |
||
1473 | } |
||
1474 | EXPORT_SYMBOL(drm_handle_vblank); |
||
1475 | |||
1476 | /** |
||
1477 | * drm_crtc_handle_vblank - handle a vblank event |
||
1478 | * @crtc: where this event occurred |
||
1479 | * |
||
1480 | * Drivers should call this routine in their vblank interrupt handlers to |
||
1481 | * update the vblank counter and send any signals that may be pending. |
||
1482 | * |
||
1483 | * This is the native KMS version of drm_handle_vblank(). |
||
1484 | * |
||
1485 | * Returns: |
||
1486 | * True if the event was successfully handled, false on failure. |
||
1487 | */ |
||
1488 | bool drm_crtc_handle_vblank(struct drm_crtc *crtc) |
||
1489 | { |
||
1490 | return drm_handle_vblank(crtc->dev, drm_crtc_index(crtc)); |
||
1491 | } |
||
1492 | EXPORT_SYMBOL(drm_crtc_handle_vblank); |
||
1493 | |||
1494 | /** |
||
1495 | * drm_vblank_no_hw_counter - "No hw counter" implementation of .get_vblank_counter() |
||
1496 | * @dev: DRM device |
||
1497 | * @pipe: CRTC for which to read the counter |
||
1498 | * |
||
1499 | * Drivers can plug this into the .get_vblank_counter() function if |
||
1500 | * there is no useable hardware frame counter available. |
||
1501 | * |
||
1502 | * Returns: |
||
1503 | * 0 |
||
1504 | */ |
||
1505 | u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe) |
||
1506 | { |
||
1507 | return 0; |
||
1508 | } |
||
1509 | EXPORT_SYMBOL(drm_vblank_no_hw_counter); |
||
1510 | |||
6084 | serge | 1511 | u64 div64_u64(u64 dividend, u64 divisor) |
1512 | { |
||
1513 | u32 high, d; |
||
1514 | |||
1515 | high = divisor >> 32; |
||
1516 | if (high) { |
||
1517 | unsigned int shift = fls(high); |
||
1518 | |||
1519 | d = divisor >> shift; |
||
1520 | dividend >>= shift; |
||
1521 | } else |
||
1522 | d = divisor; |
||
1523 | |||
1524 | return div_u64(dividend, d); |
||
1525 | }23)) |