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77913b39 JN |
1 | /* |
2 | * Copyright © 2015 Intel Corporation | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | ||
26 | #include <drm/drmP.h> | |
27 | #include <drm/i915_drm.h> | |
28 | ||
29 | #include "i915_drv.h" | |
30 | #include "intel_drv.h" | |
31 | ||
856974a4 JN |
32 | /** |
33 | * DOC: Hotplug | |
34 | * | |
35 | * Simply put, hotplug occurs when a display is connected to or disconnected | |
36 | * from the system. However, there may be adapters and docking stations and | |
37 | * Display Port short pulses and MST devices involved, complicating matters. | |
38 | * | |
39 | * Hotplug in i915 is handled in many different levels of abstraction. | |
40 | * | |
41 | * The platform dependent interrupt handling code in i915_irq.c enables, | |
42 | * disables, and does preliminary handling of the interrupts. The interrupt | |
43 | * handlers gather the hotplug detect (HPD) information from relevant registers | |
44 | * into a platform independent mask of hotplug pins that have fired. | |
45 | * | |
46 | * The platform independent interrupt handler intel_hpd_irq_handler() in | |
47 | * intel_hotplug.c does hotplug irq storm detection and mitigation, and passes | |
48 | * further processing to appropriate bottom halves (Display Port specific and | |
49 | * regular hotplug). | |
50 | * | |
51 | * The Display Port work function i915_digport_work_func() calls into | |
52 | * intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long | |
53 | * pulses, with failures and non-MST long pulses triggering regular hotplug | |
54 | * processing on the connector. | |
55 | * | |
56 | * The regular hotplug work function i915_hotplug_work_func() calls connector | |
57 | * detect hooks, and, if connector status changes, triggers sending of hotplug | |
58 | * uevent to userspace via drm_kms_helper_hotplug_event(). | |
59 | * | |
60 | * Finally, the userspace is responsible for triggering a modeset upon receiving | |
61 | * the hotplug uevent, disabling or enabling the crtc as needed. | |
62 | * | |
63 | * The hotplug interrupt storm detection and mitigation code keeps track of the | |
64 | * number of interrupts per hotplug pin per a period of time, and if the number | |
65 | * of interrupts exceeds a certain threshold, the interrupt is disabled for a | |
66 | * while before being re-enabled. The intention is to mitigate issues raising | |
67 | * from broken hardware triggering massive amounts of interrupts and grinding | |
68 | * the system to a halt. | |
feecb691 TS |
69 | * |
70 | * Current implementation expects that hotplug interrupt storm will not be | |
71 | * seen when display port sink is connected, hence on platforms whose DP | |
72 | * callback is handled by i915_digport_work_func reenabling of hpd is not | |
73 | * performed (it was never expected to be disabled in the first place ;) ) | |
74 | * this is specific to DP sinks handled by this routine and any other display | |
75 | * such as HDMI or DVI enabled on the same port will have proper logic since | |
76 | * it will use i915_hotplug_work_func where this logic is handled. | |
856974a4 JN |
77 | */ |
78 | ||
cc24fcdc | 79 | bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port) |
77913b39 JN |
80 | { |
81 | switch (pin) { | |
cc24fcdc ID |
82 | case HPD_PORT_A: |
83 | *port = PORT_A; | |
84 | return true; | |
77913b39 | 85 | case HPD_PORT_B: |
cc24fcdc ID |
86 | *port = PORT_B; |
87 | return true; | |
77913b39 | 88 | case HPD_PORT_C: |
cc24fcdc ID |
89 | *port = PORT_C; |
90 | return true; | |
77913b39 | 91 | case HPD_PORT_D: |
cc24fcdc ID |
92 | *port = PORT_D; |
93 | return true; | |
26951caf XZ |
94 | case HPD_PORT_E: |
95 | *port = PORT_E; | |
96 | return true; | |
77913b39 | 97 | default: |
cc24fcdc | 98 | return false; /* no hpd */ |
77913b39 JN |
99 | } |
100 | } | |
101 | ||
102 | #define HPD_STORM_DETECT_PERIOD 1000 | |
103 | #define HPD_STORM_THRESHOLD 5 | |
104 | #define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000) | |
105 | ||
106 | /** | |
107 | * intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin | |
108 | * @dev_priv: private driver data pointer | |
109 | * @pin: the pin to gather stats on | |
110 | * | |
111 | * Gather stats about HPD irqs from the specified @pin, and detect irq | |
112 | * storms. Only the pin specific stats and state are changed, the caller is | |
113 | * responsible for further action. | |
114 | * | |
115 | * @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms, | |
116 | * otherwise it's considered an irq storm, and the irq state is set to | |
117 | * @HPD_MARK_DISABLED. | |
118 | * | |
119 | * Return true if an irq storm was detected on @pin. | |
120 | */ | |
121 | static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv, | |
122 | enum hpd_pin pin) | |
123 | { | |
124 | unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies; | |
125 | unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD); | |
126 | bool storm = false; | |
127 | ||
128 | if (!time_in_range(jiffies, start, end)) { | |
129 | dev_priv->hotplug.stats[pin].last_jiffies = jiffies; | |
130 | dev_priv->hotplug.stats[pin].count = 0; | |
131 | DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin); | |
132 | } else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) { | |
133 | dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED; | |
134 | DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin); | |
135 | storm = true; | |
136 | } else { | |
137 | dev_priv->hotplug.stats[pin].count++; | |
138 | DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin, | |
139 | dev_priv->hotplug.stats[pin].count); | |
140 | } | |
141 | ||
142 | return storm; | |
143 | } | |
144 | ||
145 | static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv) | |
146 | { | |
91c8a326 | 147 | struct drm_device *dev = &dev_priv->drm; |
77913b39 JN |
148 | struct drm_mode_config *mode_config = &dev->mode_config; |
149 | struct intel_connector *intel_connector; | |
150 | struct intel_encoder *intel_encoder; | |
151 | struct drm_connector *connector; | |
152 | enum hpd_pin pin; | |
153 | bool hpd_disabled = false; | |
154 | ||
155 | assert_spin_locked(&dev_priv->irq_lock); | |
156 | ||
157 | list_for_each_entry(connector, &mode_config->connector_list, head) { | |
158 | if (connector->polled != DRM_CONNECTOR_POLL_HPD) | |
159 | continue; | |
160 | ||
161 | intel_connector = to_intel_connector(connector); | |
162 | intel_encoder = intel_connector->encoder; | |
163 | if (!intel_encoder) | |
164 | continue; | |
165 | ||
166 | pin = intel_encoder->hpd_pin; | |
167 | if (pin == HPD_NONE || | |
168 | dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED) | |
169 | continue; | |
170 | ||
171 | DRM_INFO("HPD interrupt storm detected on connector %s: " | |
172 | "switching from hotplug detection to polling\n", | |
173 | connector->name); | |
174 | ||
175 | dev_priv->hotplug.stats[pin].state = HPD_DISABLED; | |
176 | connector->polled = DRM_CONNECTOR_POLL_CONNECT | |
177 | | DRM_CONNECTOR_POLL_DISCONNECT; | |
178 | hpd_disabled = true; | |
179 | } | |
180 | ||
181 | /* Enable polling and queue hotplug re-enabling. */ | |
182 | if (hpd_disabled) { | |
b94be972 | 183 | drm_kms_helper_poll_enable_locked(dev); |
77913b39 JN |
184 | mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work, |
185 | msecs_to_jiffies(HPD_STORM_REENABLE_DELAY)); | |
186 | } | |
187 | } | |
188 | ||
189 | static void intel_hpd_irq_storm_reenable_work(struct work_struct *work) | |
190 | { | |
191 | struct drm_i915_private *dev_priv = | |
192 | container_of(work, typeof(*dev_priv), | |
193 | hotplug.reenable_work.work); | |
91c8a326 | 194 | struct drm_device *dev = &dev_priv->drm; |
77913b39 JN |
195 | struct drm_mode_config *mode_config = &dev->mode_config; |
196 | int i; | |
197 | ||
198 | intel_runtime_pm_get(dev_priv); | |
199 | ||
200 | spin_lock_irq(&dev_priv->irq_lock); | |
201 | for_each_hpd_pin(i) { | |
202 | struct drm_connector *connector; | |
203 | ||
204 | if (dev_priv->hotplug.stats[i].state != HPD_DISABLED) | |
205 | continue; | |
206 | ||
207 | dev_priv->hotplug.stats[i].state = HPD_ENABLED; | |
208 | ||
209 | list_for_each_entry(connector, &mode_config->connector_list, head) { | |
210 | struct intel_connector *intel_connector = to_intel_connector(connector); | |
211 | ||
212 | if (intel_connector->encoder->hpd_pin == i) { | |
213 | if (connector->polled != intel_connector->polled) | |
214 | DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n", | |
215 | connector->name); | |
216 | connector->polled = intel_connector->polled; | |
217 | if (!connector->polled) | |
218 | connector->polled = DRM_CONNECTOR_POLL_HPD; | |
219 | } | |
220 | } | |
221 | } | |
222 | if (dev_priv->display.hpd_irq_setup) | |
91d14251 | 223 | dev_priv->display.hpd_irq_setup(dev_priv); |
77913b39 JN |
224 | spin_unlock_irq(&dev_priv->irq_lock); |
225 | ||
226 | intel_runtime_pm_put(dev_priv); | |
227 | } | |
228 | ||
229 | static bool intel_hpd_irq_event(struct drm_device *dev, | |
230 | struct drm_connector *connector) | |
231 | { | |
232 | enum drm_connector_status old_status; | |
233 | ||
234 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); | |
235 | old_status = connector->status; | |
236 | ||
237 | connector->status = connector->funcs->detect(connector, false); | |
238 | if (old_status == connector->status) | |
239 | return false; | |
240 | ||
241 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", | |
242 | connector->base.id, | |
243 | connector->name, | |
244 | drm_get_connector_status_name(old_status), | |
245 | drm_get_connector_status_name(connector->status)); | |
246 | ||
247 | return true; | |
248 | } | |
249 | ||
250 | static void i915_digport_work_func(struct work_struct *work) | |
251 | { | |
252 | struct drm_i915_private *dev_priv = | |
253 | container_of(work, struct drm_i915_private, hotplug.dig_port_work); | |
254 | u32 long_port_mask, short_port_mask; | |
255 | struct intel_digital_port *intel_dig_port; | |
256 | int i; | |
257 | u32 old_bits = 0; | |
258 | ||
259 | spin_lock_irq(&dev_priv->irq_lock); | |
260 | long_port_mask = dev_priv->hotplug.long_port_mask; | |
261 | dev_priv->hotplug.long_port_mask = 0; | |
262 | short_port_mask = dev_priv->hotplug.short_port_mask; | |
263 | dev_priv->hotplug.short_port_mask = 0; | |
264 | spin_unlock_irq(&dev_priv->irq_lock); | |
265 | ||
266 | for (i = 0; i < I915_MAX_PORTS; i++) { | |
267 | bool valid = false; | |
268 | bool long_hpd = false; | |
269 | intel_dig_port = dev_priv->hotplug.irq_port[i]; | |
270 | if (!intel_dig_port || !intel_dig_port->hpd_pulse) | |
271 | continue; | |
272 | ||
273 | if (long_port_mask & (1 << i)) { | |
274 | valid = true; | |
275 | long_hpd = true; | |
276 | } else if (short_port_mask & (1 << i)) | |
277 | valid = true; | |
278 | ||
279 | if (valid) { | |
280 | enum irqreturn ret; | |
281 | ||
282 | ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd); | |
283 | if (ret == IRQ_NONE) { | |
284 | /* fall back to old school hpd */ | |
285 | old_bits |= (1 << intel_dig_port->base.hpd_pin); | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | if (old_bits) { | |
291 | spin_lock_irq(&dev_priv->irq_lock); | |
292 | dev_priv->hotplug.event_bits |= old_bits; | |
293 | spin_unlock_irq(&dev_priv->irq_lock); | |
294 | schedule_work(&dev_priv->hotplug.hotplug_work); | |
295 | } | |
296 | } | |
297 | ||
298 | /* | |
299 | * Handle hotplug events outside the interrupt handler proper. | |
300 | */ | |
301 | static void i915_hotplug_work_func(struct work_struct *work) | |
302 | { | |
303 | struct drm_i915_private *dev_priv = | |
304 | container_of(work, struct drm_i915_private, hotplug.hotplug_work); | |
91c8a326 | 305 | struct drm_device *dev = &dev_priv->drm; |
77913b39 JN |
306 | struct drm_mode_config *mode_config = &dev->mode_config; |
307 | struct intel_connector *intel_connector; | |
308 | struct intel_encoder *intel_encoder; | |
309 | struct drm_connector *connector; | |
310 | bool changed = false; | |
311 | u32 hpd_event_bits; | |
312 | ||
313 | mutex_lock(&mode_config->mutex); | |
314 | DRM_DEBUG_KMS("running encoder hotplug functions\n"); | |
315 | ||
316 | spin_lock_irq(&dev_priv->irq_lock); | |
317 | ||
318 | hpd_event_bits = dev_priv->hotplug.event_bits; | |
319 | dev_priv->hotplug.event_bits = 0; | |
320 | ||
321 | /* Disable hotplug on connectors that hit an irq storm. */ | |
322 | intel_hpd_irq_storm_disable(dev_priv); | |
323 | ||
324 | spin_unlock_irq(&dev_priv->irq_lock); | |
325 | ||
326 | list_for_each_entry(connector, &mode_config->connector_list, head) { | |
327 | intel_connector = to_intel_connector(connector); | |
328 | if (!intel_connector->encoder) | |
329 | continue; | |
330 | intel_encoder = intel_connector->encoder; | |
331 | if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) { | |
332 | DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n", | |
333 | connector->name, intel_encoder->hpd_pin); | |
334 | if (intel_encoder->hot_plug) | |
335 | intel_encoder->hot_plug(intel_encoder); | |
336 | if (intel_hpd_irq_event(dev, connector)) | |
337 | changed = true; | |
338 | } | |
339 | } | |
340 | mutex_unlock(&mode_config->mutex); | |
341 | ||
342 | if (changed) | |
343 | drm_kms_helper_hotplug_event(dev); | |
344 | } | |
345 | ||
346 | ||
347 | /** | |
348 | * intel_hpd_irq_handler - main hotplug irq handler | |
91d14251 | 349 | * @dev_priv: drm_i915_private |
77913b39 JN |
350 | * @pin_mask: a mask of hpd pins that have triggered the irq |
351 | * @long_mask: a mask of hpd pins that may be long hpd pulses | |
352 | * | |
353 | * This is the main hotplug irq handler for all platforms. The platform specific | |
354 | * irq handlers call the platform specific hotplug irq handlers, which read and | |
355 | * decode the appropriate registers into bitmasks about hpd pins that have | |
356 | * triggered (@pin_mask), and which of those pins may be long pulses | |
357 | * (@long_mask). The @long_mask is ignored if the port corresponding to the pin | |
358 | * is not a digital port. | |
359 | * | |
360 | * Here, we do hotplug irq storm detection and mitigation, and pass further | |
361 | * processing to appropriate bottom halves. | |
362 | */ | |
91d14251 | 363 | void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, |
77913b39 JN |
364 | u32 pin_mask, u32 long_mask) |
365 | { | |
77913b39 JN |
366 | int i; |
367 | enum port port; | |
368 | bool storm_detected = false; | |
369 | bool queue_dig = false, queue_hp = false; | |
370 | bool is_dig_port; | |
371 | ||
372 | if (!pin_mask) | |
373 | return; | |
374 | ||
375 | spin_lock(&dev_priv->irq_lock); | |
376 | for_each_hpd_pin(i) { | |
377 | if (!(BIT(i) & pin_mask)) | |
378 | continue; | |
379 | ||
cc24fcdc ID |
380 | is_dig_port = intel_hpd_pin_to_port(i, &port) && |
381 | dev_priv->hotplug.irq_port[port]; | |
77913b39 JN |
382 | |
383 | if (is_dig_port) { | |
384 | bool long_hpd = long_mask & BIT(i); | |
385 | ||
386 | DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port), | |
387 | long_hpd ? "long" : "short"); | |
388 | /* | |
389 | * For long HPD pulses we want to have the digital queue happen, | |
390 | * but we still want HPD storm detection to function. | |
391 | */ | |
392 | queue_dig = true; | |
393 | if (long_hpd) { | |
394 | dev_priv->hotplug.long_port_mask |= (1 << port); | |
395 | } else { | |
396 | /* for short HPD just trigger the digital queue */ | |
397 | dev_priv->hotplug.short_port_mask |= (1 << port); | |
398 | continue; | |
399 | } | |
400 | } | |
401 | ||
402 | if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) { | |
403 | /* | |
404 | * On GMCH platforms the interrupt mask bits only | |
405 | * prevent irq generation, not the setting of the | |
406 | * hotplug bits itself. So only WARN about unexpected | |
407 | * interrupts on saner platforms. | |
408 | */ | |
91d14251 | 409 | WARN_ONCE(!HAS_GMCH_DISPLAY(dev_priv), |
77913b39 JN |
410 | "Received HPD interrupt on pin %d although disabled\n", i); |
411 | continue; | |
412 | } | |
413 | ||
414 | if (dev_priv->hotplug.stats[i].state != HPD_ENABLED) | |
415 | continue; | |
416 | ||
417 | if (!is_dig_port) { | |
418 | dev_priv->hotplug.event_bits |= BIT(i); | |
419 | queue_hp = true; | |
420 | } | |
421 | ||
422 | if (intel_hpd_irq_storm_detect(dev_priv, i)) { | |
423 | dev_priv->hotplug.event_bits &= ~BIT(i); | |
424 | storm_detected = true; | |
425 | } | |
426 | } | |
427 | ||
428 | if (storm_detected) | |
91d14251 | 429 | dev_priv->display.hpd_irq_setup(dev_priv); |
77913b39 JN |
430 | spin_unlock(&dev_priv->irq_lock); |
431 | ||
432 | /* | |
433 | * Our hotplug handler can grab modeset locks (by calling down into the | |
434 | * fb helpers). Hence it must not be run on our own dev-priv->wq work | |
435 | * queue for otherwise the flush_work in the pageflip code will | |
436 | * deadlock. | |
437 | */ | |
438 | if (queue_dig) | |
439 | queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work); | |
440 | if (queue_hp) | |
441 | schedule_work(&dev_priv->hotplug.hotplug_work); | |
442 | } | |
443 | ||
444 | /** | |
445 | * intel_hpd_init - initializes and enables hpd support | |
446 | * @dev_priv: i915 device instance | |
447 | * | |
448 | * This function enables the hotplug support. It requires that interrupts have | |
449 | * already been enabled with intel_irq_init_hw(). From this point on hotplug and | |
450 | * poll request can run concurrently to other code, so locking rules must be | |
451 | * obeyed. | |
452 | * | |
453 | * This is a separate step from interrupt enabling to simplify the locking rules | |
454 | * in the driver load and resume code. | |
19625e85 L |
455 | * |
456 | * Also see: intel_hpd_poll_init(), which enables connector polling | |
77913b39 JN |
457 | */ |
458 | void intel_hpd_init(struct drm_i915_private *dev_priv) | |
459 | { | |
77913b39 JN |
460 | int i; |
461 | ||
462 | for_each_hpd_pin(i) { | |
463 | dev_priv->hotplug.stats[i].count = 0; | |
464 | dev_priv->hotplug.stats[i].state = HPD_ENABLED; | |
465 | } | |
19625e85 L |
466 | |
467 | WRITE_ONCE(dev_priv->hotplug.poll_enabled, false); | |
468 | schedule_work(&dev_priv->hotplug.poll_init_work); | |
469 | ||
470 | /* | |
471 | * Interrupt setup is already guaranteed to be single-threaded, this is | |
472 | * just to make the assert_spin_locked checks happy. | |
473 | */ | |
474 | spin_lock_irq(&dev_priv->irq_lock); | |
475 | if (dev_priv->display.hpd_irq_setup) | |
476 | dev_priv->display.hpd_irq_setup(dev_priv); | |
477 | spin_unlock_irq(&dev_priv->irq_lock); | |
478 | } | |
479 | ||
480 | void i915_hpd_poll_init_work(struct work_struct *work) { | |
481 | struct drm_i915_private *dev_priv = | |
482 | container_of(work, struct drm_i915_private, | |
483 | hotplug.poll_init_work); | |
484 | struct drm_device *dev = &dev_priv->drm; | |
485 | struct drm_mode_config *mode_config = &dev->mode_config; | |
486 | struct drm_connector *connector; | |
487 | bool enabled; | |
488 | ||
489 | mutex_lock(&dev->mode_config.mutex); | |
490 | ||
491 | enabled = READ_ONCE(dev_priv->hotplug.poll_enabled); | |
492 | ||
77913b39 | 493 | list_for_each_entry(connector, &mode_config->connector_list, head) { |
19625e85 L |
494 | struct intel_connector *intel_connector = |
495 | to_intel_connector(connector); | |
77913b39 | 496 | connector->polled = intel_connector->polled; |
07c51913 L |
497 | |
498 | /* MST has a dynamic intel_connector->encoder and it's reprobing | |
499 | * is all handled by the MST helpers. */ | |
77913b39 | 500 | if (intel_connector->mst_port) |
07c51913 L |
501 | continue; |
502 | ||
503 | if (!connector->polled && I915_HAS_HOTPLUG(dev) && | |
19625e85 L |
504 | intel_connector->encoder->hpd_pin > HPD_NONE) { |
505 | connector->polled = enabled ? | |
506 | DRM_CONNECTOR_POLL_CONNECT | | |
507 | DRM_CONNECTOR_POLL_DISCONNECT : | |
508 | DRM_CONNECTOR_POLL_HPD; | |
509 | } | |
77913b39 JN |
510 | } |
511 | ||
19625e85 L |
512 | if (enabled) |
513 | drm_kms_helper_poll_enable_locked(dev); | |
514 | ||
515 | mutex_unlock(&dev->mode_config.mutex); | |
516 | ||
77913b39 | 517 | /* |
19625e85 L |
518 | * We might have missed any hotplugs that happened while we were |
519 | * in the middle of disabling polling | |
77913b39 | 520 | */ |
19625e85 L |
521 | if (!enabled) |
522 | drm_helper_hpd_irq_event(dev); | |
523 | } | |
524 | ||
525 | /** | |
526 | * intel_hpd_poll_init - enables/disables polling for connectors with hpd | |
527 | * @dev_priv: i915 device instance | |
19625e85 L |
528 | * |
529 | * This function enables polling for all connectors, regardless of whether or | |
530 | * not they support hotplug detection. Under certain conditions HPD may not be | |
531 | * functional. On most Intel GPUs, this happens when we enter runtime suspend. | |
532 | * On Valleyview and Cherryview systems, this also happens when we shut off all | |
533 | * of the powerwells. | |
534 | * | |
535 | * Since this function can get called in contexts where we're already holding | |
536 | * dev->mode_config.mutex, we do the actual hotplug enabling in a seperate | |
537 | * worker. | |
538 | * | |
539 | * Also see: intel_hpd_init(), which restores hpd handling. | |
540 | */ | |
541 | void intel_hpd_poll_init(struct drm_i915_private *dev_priv) | |
542 | { | |
543 | WRITE_ONCE(dev_priv->hotplug.poll_enabled, true); | |
544 | ||
545 | /* | |
546 | * We might already be holding dev->mode_config.mutex, so do this in a | |
547 | * seperate worker | |
548 | * As well, there's no issue if we race here since we always reschedule | |
549 | * this worker anyway | |
550 | */ | |
551 | schedule_work(&dev_priv->hotplug.poll_init_work); | |
77913b39 JN |
552 | } |
553 | ||
554 | void intel_hpd_init_work(struct drm_i915_private *dev_priv) | |
555 | { | |
556 | INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func); | |
557 | INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func); | |
19625e85 | 558 | INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work); |
77913b39 JN |
559 | INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work, |
560 | intel_hpd_irq_storm_reenable_work); | |
561 | } | |
562 | ||
563 | void intel_hpd_cancel_work(struct drm_i915_private *dev_priv) | |
564 | { | |
565 | spin_lock_irq(&dev_priv->irq_lock); | |
566 | ||
567 | dev_priv->hotplug.long_port_mask = 0; | |
568 | dev_priv->hotplug.short_port_mask = 0; | |
569 | dev_priv->hotplug.event_bits = 0; | |
570 | ||
571 | spin_unlock_irq(&dev_priv->irq_lock); | |
572 | ||
573 | cancel_work_sync(&dev_priv->hotplug.dig_port_work); | |
574 | cancel_work_sync(&dev_priv->hotplug.hotplug_work); | |
19625e85 | 575 | cancel_work_sync(&dev_priv->hotplug.poll_init_work); |
77913b39 JN |
576 | cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work); |
577 | } | |
b236d7c8 L |
578 | |
579 | bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin) | |
580 | { | |
581 | bool ret = false; | |
582 | ||
583 | if (pin == HPD_NONE) | |
584 | return false; | |
585 | ||
586 | spin_lock_irq(&dev_priv->irq_lock); | |
587 | if (dev_priv->hotplug.stats[pin].state == HPD_ENABLED) { | |
588 | dev_priv->hotplug.stats[pin].state = HPD_DISABLED; | |
589 | ret = true; | |
590 | } | |
591 | spin_unlock_irq(&dev_priv->irq_lock); | |
592 | ||
593 | return ret; | |
594 | } | |
595 | ||
596 | void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin) | |
597 | { | |
598 | if (pin == HPD_NONE) | |
599 | return; | |
600 | ||
601 | spin_lock_irq(&dev_priv->irq_lock); | |
602 | dev_priv->hotplug.stats[pin].state = HPD_ENABLED; | |
603 | spin_unlock_irq(&dev_priv->irq_lock); | |
604 | } |