Rev 6320 | Details | Compare with Previous | Last modification | View Log | RSS feed
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6320 | serge | 1 | /* |
2 | * Copyright © 2015 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 DEALINGS |
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21 | * IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | #include |
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25 | |||
26 | #include |
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27 | #include |
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28 | |||
29 | #include "i915_drv.h" |
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30 | #include "intel_drv.h" |
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31 | |||
32 | /** |
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33 | * DOC: Hotplug |
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34 | * |
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35 | * Simply put, hotplug occurs when a display is connected to or disconnected |
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36 | * from the system. However, there may be adapters and docking stations and |
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37 | * Display Port short pulses and MST devices involved, complicating matters. |
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38 | * |
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39 | * Hotplug in i915 is handled in many different levels of abstraction. |
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40 | * |
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41 | * The platform dependent interrupt handling code in i915_irq.c enables, |
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42 | * disables, and does preliminary handling of the interrupts. The interrupt |
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43 | * handlers gather the hotplug detect (HPD) information from relevant registers |
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44 | * into a platform independent mask of hotplug pins that have fired. |
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45 | * |
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46 | * The platform independent interrupt handler intel_hpd_irq_handler() in |
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47 | * intel_hotplug.c does hotplug irq storm detection and mitigation, and passes |
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48 | * further processing to appropriate bottom halves (Display Port specific and |
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49 | * regular hotplug). |
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50 | * |
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51 | * The Display Port work function i915_digport_work_func() calls into |
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52 | * intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long |
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53 | * pulses, with failures and non-MST long pulses triggering regular hotplug |
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54 | * processing on the connector. |
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55 | * |
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56 | * The regular hotplug work function i915_hotplug_work_func() calls connector |
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57 | * detect hooks, and, if connector status changes, triggers sending of hotplug |
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58 | * uevent to userspace via drm_kms_helper_hotplug_event(). |
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59 | * |
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60 | * Finally, the userspace is responsible for triggering a modeset upon receiving |
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61 | * the hotplug uevent, disabling or enabling the crtc as needed. |
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62 | * |
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63 | * The hotplug interrupt storm detection and mitigation code keeps track of the |
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64 | * number of interrupts per hotplug pin per a period of time, and if the number |
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65 | * of interrupts exceeds a certain threshold, the interrupt is disabled for a |
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66 | * while before being re-enabled. The intention is to mitigate issues raising |
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67 | * from broken hardware triggering massive amounts of interrupts and grinding |
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68 | * the system to a halt. |
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69 | * |
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70 | * Current implementation expects that hotplug interrupt storm will not be |
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71 | * seen when display port sink is connected, hence on platforms whose DP |
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72 | * callback is handled by i915_digport_work_func reenabling of hpd is not |
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73 | * performed (it was never expected to be disabled in the first place ;) ) |
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74 | * this is specific to DP sinks handled by this routine and any other display |
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75 | * such as HDMI or DVI enabled on the same port will have proper logic since |
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76 | * it will use i915_hotplug_work_func where this logic is handled. |
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77 | */ |
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78 | |||
79 | bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port) |
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80 | { |
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81 | switch (pin) { |
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82 | case HPD_PORT_A: |
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83 | *port = PORT_A; |
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84 | return true; |
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85 | case HPD_PORT_B: |
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86 | *port = PORT_B; |
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87 | return true; |
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88 | case HPD_PORT_C: |
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89 | *port = PORT_C; |
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90 | return true; |
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91 | case HPD_PORT_D: |
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92 | *port = PORT_D; |
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93 | return true; |
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94 | case HPD_PORT_E: |
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95 | *port = PORT_E; |
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96 | return true; |
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97 | default: |
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98 | return false; /* no hpd */ |
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99 | } |
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100 | } |
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101 | |||
102 | #define HPD_STORM_DETECT_PERIOD 1000 |
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103 | #define HPD_STORM_THRESHOLD 5 |
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104 | #define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000) |
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105 | |||
106 | /** |
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107 | * intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin |
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108 | * @dev_priv: private driver data pointer |
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109 | * @pin: the pin to gather stats on |
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110 | * |
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111 | * Gather stats about HPD irqs from the specified @pin, and detect irq |
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112 | * storms. Only the pin specific stats and state are changed, the caller is |
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113 | * responsible for further action. |
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114 | * |
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115 | * @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms, |
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116 | * otherwise it's considered an irq storm, and the irq state is set to |
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117 | * @HPD_MARK_DISABLED. |
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118 | * |
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119 | * Return true if an irq storm was detected on @pin. |
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120 | */ |
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121 | static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv, |
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122 | enum hpd_pin pin) |
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123 | { |
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124 | unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies; |
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125 | unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD); |
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126 | bool storm = false; |
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127 | |||
128 | if (!time_in_range(jiffies, start, end)) { |
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129 | dev_priv->hotplug.stats[pin].last_jiffies = jiffies; |
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130 | dev_priv->hotplug.stats[pin].count = 0; |
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131 | DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin); |
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132 | } else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) { |
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133 | dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED; |
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134 | DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin); |
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135 | storm = true; |
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136 | } else { |
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137 | dev_priv->hotplug.stats[pin].count++; |
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138 | DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin, |
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139 | dev_priv->hotplug.stats[pin].count); |
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140 | } |
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141 | |||
142 | return storm; |
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143 | } |
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144 | |||
145 | static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv) |
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146 | { |
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147 | struct drm_device *dev = dev_priv->dev; |
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148 | struct drm_mode_config *mode_config = &dev->mode_config; |
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149 | struct intel_connector *intel_connector; |
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150 | struct intel_encoder *intel_encoder; |
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151 | struct drm_connector *connector; |
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152 | enum hpd_pin pin; |
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153 | bool hpd_disabled = false; |
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154 | |||
155 | assert_spin_locked(&dev_priv->irq_lock); |
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156 | |||
157 | list_for_each_entry(connector, &mode_config->connector_list, head) { |
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158 | if (connector->polled != DRM_CONNECTOR_POLL_HPD) |
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159 | continue; |
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160 | |||
161 | intel_connector = to_intel_connector(connector); |
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162 | intel_encoder = intel_connector->encoder; |
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163 | if (!intel_encoder) |
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164 | continue; |
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165 | |||
166 | pin = intel_encoder->hpd_pin; |
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167 | if (pin == HPD_NONE || |
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168 | dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED) |
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169 | continue; |
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170 | |||
171 | DRM_INFO("HPD interrupt storm detected on connector %s: " |
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172 | "switching from hotplug detection to polling\n", |
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173 | connector->name); |
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174 | |||
175 | dev_priv->hotplug.stats[pin].state = HPD_DISABLED; |
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176 | connector->polled = DRM_CONNECTOR_POLL_CONNECT |
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177 | | DRM_CONNECTOR_POLL_DISCONNECT; |
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178 | hpd_disabled = true; |
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179 | } |
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180 | |||
181 | /* Enable polling and queue hotplug re-enabling. */ |
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182 | if (hpd_disabled) { |
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183 | drm_kms_helper_poll_enable_locked(dev); |
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184 | mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work, |
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185 | msecs_to_jiffies(HPD_STORM_REENABLE_DELAY)); |
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186 | } |
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187 | } |
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188 | |||
189 | static void intel_hpd_irq_storm_reenable_work(struct work_struct *work) |
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190 | { |
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191 | struct drm_i915_private *dev_priv = |
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192 | container_of(work, typeof(*dev_priv), |
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193 | hotplug.reenable_work.work); |
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194 | struct drm_device *dev = dev_priv->dev; |
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195 | struct drm_mode_config *mode_config = &dev->mode_config; |
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196 | int i; |
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197 | |||
198 | intel_runtime_pm_get(dev_priv); |
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199 | |||
200 | spin_lock_irq(&dev_priv->irq_lock); |
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201 | for_each_hpd_pin(i) { |
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202 | struct drm_connector *connector; |
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203 | |||
204 | if (dev_priv->hotplug.stats[i].state != HPD_DISABLED) |
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205 | continue; |
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206 | |||
207 | dev_priv->hotplug.stats[i].state = HPD_ENABLED; |
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208 | |||
209 | list_for_each_entry(connector, &mode_config->connector_list, head) { |
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210 | struct intel_connector *intel_connector = to_intel_connector(connector); |
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211 | |||
212 | if (intel_connector->encoder->hpd_pin == i) { |
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213 | if (connector->polled != intel_connector->polled) |
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214 | DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n", |
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215 | connector->name); |
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216 | connector->polled = intel_connector->polled; |
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217 | if (!connector->polled) |
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218 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
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219 | } |
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220 | } |
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221 | } |
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222 | if (dev_priv->display.hpd_irq_setup) |
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223 | dev_priv->display.hpd_irq_setup(dev); |
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224 | spin_unlock_irq(&dev_priv->irq_lock); |
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225 | |||
226 | intel_runtime_pm_put(dev_priv); |
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227 | } |
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228 | |||
229 | static bool intel_hpd_irq_event(struct drm_device *dev, |
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230 | struct drm_connector *connector) |
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231 | { |
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232 | enum drm_connector_status old_status; |
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233 | |||
234 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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235 | old_status = connector->status; |
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236 | |||
237 | connector->status = connector->funcs->detect(connector, false); |
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238 | if (old_status == connector->status) |
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239 | return false; |
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240 | |||
241 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
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242 | connector->base.id, |
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243 | connector->name, |
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244 | drm_get_connector_status_name(old_status), |
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245 | drm_get_connector_status_name(connector->status)); |
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246 | |||
247 | return true; |
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248 | } |
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249 | |||
250 | static void i915_digport_work_func(struct work_struct *work) |
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251 | { |
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252 | struct drm_i915_private *dev_priv = |
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253 | container_of(work, struct drm_i915_private, hotplug.dig_port_work); |
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254 | u32 long_port_mask, short_port_mask; |
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255 | struct intel_digital_port *intel_dig_port; |
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256 | int i; |
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257 | u32 old_bits = 0; |
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258 | |||
259 | spin_lock_irq(&dev_priv->irq_lock); |
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260 | long_port_mask = dev_priv->hotplug.long_port_mask; |
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261 | dev_priv->hotplug.long_port_mask = 0; |
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262 | short_port_mask = dev_priv->hotplug.short_port_mask; |
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263 | dev_priv->hotplug.short_port_mask = 0; |
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264 | spin_unlock_irq(&dev_priv->irq_lock); |
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265 | |||
266 | for (i = 0; i < I915_MAX_PORTS; i++) { |
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267 | bool valid = false; |
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268 | bool long_hpd = false; |
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269 | intel_dig_port = dev_priv->hotplug.irq_port[i]; |
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270 | if (!intel_dig_port || !intel_dig_port->hpd_pulse) |
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271 | continue; |
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272 | |||
273 | if (long_port_mask & (1 << i)) { |
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274 | valid = true; |
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275 | long_hpd = true; |
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276 | } else if (short_port_mask & (1 << i)) |
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277 | valid = true; |
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278 | |||
279 | if (valid) { |
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280 | enum irqreturn ret; |
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281 | |||
282 | ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd); |
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283 | if (ret == IRQ_NONE) { |
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284 | /* fall back to old school hpd */ |
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285 | old_bits |= (1 << intel_dig_port->base.hpd_pin); |
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286 | } |
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287 | } |
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288 | } |
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289 | |||
290 | if (old_bits) { |
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291 | spin_lock_irq(&dev_priv->irq_lock); |
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292 | dev_priv->hotplug.event_bits |= old_bits; |
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293 | spin_unlock_irq(&dev_priv->irq_lock); |
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294 | schedule_work(&dev_priv->hotplug.hotplug_work); |
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295 | } |
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296 | } |
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297 | |||
298 | /* |
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299 | * Handle hotplug events outside the interrupt handler proper. |
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300 | */ |
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301 | static void i915_hotplug_work_func(struct work_struct *work) |
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302 | { |
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303 | struct drm_i915_private *dev_priv = |
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304 | container_of(work, struct drm_i915_private, hotplug.hotplug_work); |
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305 | struct drm_device *dev = dev_priv->dev; |
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306 | struct drm_mode_config *mode_config = &dev->mode_config; |
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307 | struct intel_connector *intel_connector; |
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308 | struct intel_encoder *intel_encoder; |
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309 | struct drm_connector *connector; |
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310 | bool changed = false; |
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311 | u32 hpd_event_bits; |
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312 | |||
313 | mutex_lock(&mode_config->mutex); |
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314 | DRM_DEBUG_KMS("running encoder hotplug functions\n"); |
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315 | |||
316 | spin_lock_irq(&dev_priv->irq_lock); |
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317 | |||
318 | hpd_event_bits = dev_priv->hotplug.event_bits; |
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319 | dev_priv->hotplug.event_bits = 0; |
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320 | |||
321 | /* Disable hotplug on connectors that hit an irq storm. */ |
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322 | intel_hpd_irq_storm_disable(dev_priv); |
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323 | |||
324 | spin_unlock_irq(&dev_priv->irq_lock); |
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325 | |||
326 | list_for_each_entry(connector, &mode_config->connector_list, head) { |
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327 | intel_connector = to_intel_connector(connector); |
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328 | if (!intel_connector->encoder) |
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329 | continue; |
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330 | intel_encoder = intel_connector->encoder; |
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331 | if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) { |
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332 | DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n", |
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333 | connector->name, intel_encoder->hpd_pin); |
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334 | if (intel_encoder->hot_plug) |
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335 | intel_encoder->hot_plug(intel_encoder); |
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336 | if (intel_hpd_irq_event(dev, connector)) |
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337 | changed = true; |
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338 | } |
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339 | } |
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340 | mutex_unlock(&mode_config->mutex); |
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341 | |||
342 | if (changed) |
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343 | drm_kms_helper_hotplug_event(dev); |
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344 | } |
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345 | |||
346 | |||
347 | /** |
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348 | * intel_hpd_irq_handler - main hotplug irq handler |
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349 | * @dev: drm device |
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350 | * @pin_mask: a mask of hpd pins that have triggered the irq |
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351 | * @long_mask: a mask of hpd pins that may be long hpd pulses |
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352 | * |
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353 | * This is the main hotplug irq handler for all platforms. The platform specific |
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354 | * irq handlers call the platform specific hotplug irq handlers, which read and |
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355 | * decode the appropriate registers into bitmasks about hpd pins that have |
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356 | * triggered (@pin_mask), and which of those pins may be long pulses |
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357 | * (@long_mask). The @long_mask is ignored if the port corresponding to the pin |
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358 | * is not a digital port. |
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359 | * |
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360 | * Here, we do hotplug irq storm detection and mitigation, and pass further |
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361 | * processing to appropriate bottom halves. |
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362 | */ |
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363 | void intel_hpd_irq_handler(struct drm_device *dev, |
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364 | u32 pin_mask, u32 long_mask) |
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365 | { |
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366 | struct drm_i915_private *dev_priv = dev->dev_private; |
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367 | int i; |
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368 | enum port port; |
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369 | bool storm_detected = false; |
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370 | bool queue_dig = false, queue_hp = false; |
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371 | bool is_dig_port; |
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372 | |||
373 | if (!pin_mask) |
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374 | return; |
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375 | |||
376 | spin_lock(&dev_priv->irq_lock); |
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377 | for_each_hpd_pin(i) { |
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378 | if (!(BIT(i) & pin_mask)) |
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379 | continue; |
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380 | |||
381 | is_dig_port = intel_hpd_pin_to_port(i, &port) && |
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382 | dev_priv->hotplug.irq_port[port]; |
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383 | |||
384 | if (is_dig_port) { |
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385 | bool long_hpd = long_mask & BIT(i); |
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386 | |||
387 | DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port), |
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388 | long_hpd ? "long" : "short"); |
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389 | /* |
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390 | * For long HPD pulses we want to have the digital queue happen, |
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391 | * but we still want HPD storm detection to function. |
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392 | */ |
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393 | queue_dig = true; |
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394 | if (long_hpd) { |
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395 | dev_priv->hotplug.long_port_mask |= (1 << port); |
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396 | } else { |
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397 | /* for short HPD just trigger the digital queue */ |
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398 | dev_priv->hotplug.short_port_mask |= (1 << port); |
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399 | continue; |
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400 | } |
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401 | } |
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402 | |||
403 | if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) { |
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404 | /* |
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405 | * On GMCH platforms the interrupt mask bits only |
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406 | * prevent irq generation, not the setting of the |
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407 | * hotplug bits itself. So only WARN about unexpected |
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408 | * interrupts on saner platforms. |
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409 | */ |
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6937 | serge | 410 | WARN_ONCE(!HAS_GMCH_DISPLAY(dev), |
6320 | serge | 411 | "Received HPD interrupt on pin %d although disabled\n", i); |
412 | continue; |
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413 | } |
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414 | |||
415 | if (dev_priv->hotplug.stats[i].state != HPD_ENABLED) |
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416 | continue; |
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417 | |||
418 | if (!is_dig_port) { |
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419 | dev_priv->hotplug.event_bits |= BIT(i); |
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420 | queue_hp = true; |
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421 | } |
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422 | |||
423 | if (intel_hpd_irq_storm_detect(dev_priv, i)) { |
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424 | dev_priv->hotplug.event_bits &= ~BIT(i); |
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425 | storm_detected = true; |
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426 | } |
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427 | } |
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428 | |||
429 | if (storm_detected) |
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430 | dev_priv->display.hpd_irq_setup(dev); |
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431 | spin_unlock(&dev_priv->irq_lock); |
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432 | |||
433 | /* |
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434 | * Our hotplug handler can grab modeset locks (by calling down into the |
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435 | * fb helpers). Hence it must not be run on our own dev-priv->wq work |
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436 | * queue for otherwise the flush_work in the pageflip code will |
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437 | * deadlock. |
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438 | */ |
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439 | if (queue_dig) |
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440 | queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work); |
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441 | if (queue_hp) |
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442 | schedule_work(&dev_priv->hotplug.hotplug_work); |
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443 | } |
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444 | |||
445 | /** |
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446 | * intel_hpd_init - initializes and enables hpd support |
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447 | * @dev_priv: i915 device instance |
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448 | * |
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449 | * This function enables the hotplug support. It requires that interrupts have |
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450 | * already been enabled with intel_irq_init_hw(). From this point on hotplug and |
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451 | * poll request can run concurrently to other code, so locking rules must be |
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452 | * obeyed. |
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453 | * |
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454 | * This is a separate step from interrupt enabling to simplify the locking rules |
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455 | * in the driver load and resume code. |
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456 | */ |
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457 | void intel_hpd_init(struct drm_i915_private *dev_priv) |
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458 | { |
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459 | struct drm_device *dev = dev_priv->dev; |
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460 | struct drm_mode_config *mode_config = &dev->mode_config; |
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461 | struct drm_connector *connector; |
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462 | int i; |
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463 | |||
464 | for_each_hpd_pin(i) { |
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465 | dev_priv->hotplug.stats[i].count = 0; |
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466 | dev_priv->hotplug.stats[i].state = HPD_ENABLED; |
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467 | } |
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468 | list_for_each_entry(connector, &mode_config->connector_list, head) { |
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469 | struct intel_connector *intel_connector = to_intel_connector(connector); |
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470 | connector->polled = intel_connector->polled; |
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471 | |||
472 | /* MST has a dynamic intel_connector->encoder and it's reprobing |
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473 | * is all handled by the MST helpers. */ |
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474 | if (intel_connector->mst_port) |
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475 | continue; |
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476 | |||
477 | if (!connector->polled && I915_HAS_HOTPLUG(dev) && |
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478 | intel_connector->encoder->hpd_pin > HPD_NONE) |
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479 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
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480 | } |
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481 | |||
482 | /* |
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483 | * Interrupt setup is already guaranteed to be single-threaded, this is |
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484 | * just to make the assert_spin_locked checks happy. |
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485 | */ |
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486 | spin_lock_irq(&dev_priv->irq_lock); |
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487 | if (dev_priv->display.hpd_irq_setup) |
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488 | dev_priv->display.hpd_irq_setup(dev); |
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489 | spin_unlock_irq(&dev_priv->irq_lock); |
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490 | } |
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491 | |||
492 | void intel_hpd_init_work(struct drm_i915_private *dev_priv) |
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493 | { |
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494 | INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func); |
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495 | INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func); |
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496 | INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work, |
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497 | intel_hpd_irq_storm_reenable_work); |
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498 | } |
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499 | |||
500 | void intel_hpd_cancel_work(struct drm_i915_private *dev_priv) |
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501 | { |
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502 | spin_lock_irq(&dev_priv->irq_lock); |
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503 | |||
504 | dev_priv->hotplug.long_port_mask = 0; |
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505 | dev_priv->hotplug.short_port_mask = 0; |
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506 | dev_priv->hotplug.event_bits = 0; |
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507 | |||
508 | spin_unlock_irq(&dev_priv->irq_lock); |
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509 | |||
510 | cancel_work_sync(&dev_priv->hotplug.dig_port_work); |
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511 | cancel_work_sync(&dev_priv->hotplug.hotplug_work); |
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512 | cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work); |
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513 | }><>><>><>><>><>><>> |