diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_hotplug.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_hotplug.c | 134 |
1 files changed, 113 insertions, 21 deletions
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index bee6730..f48957e 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -144,7 +144,7 @@ static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv, static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv) { - struct drm_device *dev = dev_priv->dev; + struct drm_device *dev = &dev_priv->drm; struct drm_mode_config *mode_config = &dev->mode_config; struct intel_connector *intel_connector; struct intel_encoder *intel_encoder; @@ -191,7 +191,7 @@ static void intel_hpd_irq_storm_reenable_work(struct work_struct *work) struct drm_i915_private *dev_priv = container_of(work, typeof(*dev_priv), hotplug.reenable_work.work); - struct drm_device *dev = dev_priv->dev; + struct drm_device *dev = &dev_priv->drm; struct drm_mode_config *mode_config = &dev->mode_config; int i; @@ -220,7 +220,7 @@ static void intel_hpd_irq_storm_reenable_work(struct work_struct *work) } } if (dev_priv->display.hpd_irq_setup) - dev_priv->display.hpd_irq_setup(dev); + dev_priv->display.hpd_irq_setup(dev_priv); spin_unlock_irq(&dev_priv->irq_lock); intel_runtime_pm_put(dev_priv); @@ -302,7 +302,7 @@ static void i915_hotplug_work_func(struct work_struct *work) { struct drm_i915_private *dev_priv = container_of(work, struct drm_i915_private, hotplug.hotplug_work); - struct drm_device *dev = dev_priv->dev; + struct drm_device *dev = &dev_priv->drm; struct drm_mode_config *mode_config = &dev->mode_config; struct intel_connector *intel_connector; struct intel_encoder *intel_encoder; @@ -346,7 +346,7 @@ static void i915_hotplug_work_func(struct work_struct *work) /** * intel_hpd_irq_handler - main hotplug irq handler - * @dev: drm device + * @dev_priv: drm_i915_private * @pin_mask: a mask of hpd pins that have triggered the irq * @long_mask: a mask of hpd pins that may be long hpd pulses * @@ -360,10 +360,9 @@ static void i915_hotplug_work_func(struct work_struct *work) * Here, we do hotplug irq storm detection and mitigation, and pass further * processing to appropriate bottom halves. */ -void intel_hpd_irq_handler(struct drm_device *dev, +void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 pin_mask, u32 long_mask) { - struct drm_i915_private *dev_priv = dev->dev_private; int i; enum port port; bool storm_detected = false; @@ -407,7 +406,7 @@ void intel_hpd_irq_handler(struct drm_device *dev, * hotplug bits itself. So only WARN about unexpected * interrupts on saner platforms. */ - WARN_ONCE(!HAS_GMCH_DISPLAY(dev), + WARN_ONCE(!HAS_GMCH_DISPLAY(dev_priv), "Received HPD interrupt on pin %d although disabled\n", i); continue; } @@ -427,7 +426,7 @@ void intel_hpd_irq_handler(struct drm_device *dev, } if (storm_detected) - dev_priv->display.hpd_irq_setup(dev); + dev_priv->display.hpd_irq_setup(dev_priv); spin_unlock(&dev_priv->irq_lock); /* @@ -453,20 +452,47 @@ void intel_hpd_irq_handler(struct drm_device *dev, * * This is a separate step from interrupt enabling to simplify the locking rules * in the driver load and resume code. + * + * Also see: intel_hpd_poll_init(), which enables connector polling */ void intel_hpd_init(struct drm_i915_private *dev_priv) { - struct drm_device *dev = dev_priv->dev; - struct drm_mode_config *mode_config = &dev->mode_config; - struct drm_connector *connector; int i; for_each_hpd_pin(i) { dev_priv->hotplug.stats[i].count = 0; dev_priv->hotplug.stats[i].state = HPD_ENABLED; } + + WRITE_ONCE(dev_priv->hotplug.poll_enabled, false); + schedule_work(&dev_priv->hotplug.poll_init_work); + + /* + * Interrupt setup is already guaranteed to be single-threaded, this is + * just to make the assert_spin_locked checks happy. + */ + spin_lock_irq(&dev_priv->irq_lock); + if (dev_priv->display.hpd_irq_setup) + dev_priv->display.hpd_irq_setup(dev_priv); + spin_unlock_irq(&dev_priv->irq_lock); +} + +void i915_hpd_poll_init_work(struct work_struct *work) { + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, + hotplug.poll_init_work); + struct drm_device *dev = &dev_priv->drm; + struct drm_mode_config *mode_config = &dev->mode_config; + struct drm_connector *connector; + bool enabled; + + mutex_lock(&dev->mode_config.mutex); + + enabled = READ_ONCE(dev_priv->hotplug.poll_enabled); + list_for_each_entry(connector, &mode_config->connector_list, head) { - struct intel_connector *intel_connector = to_intel_connector(connector); + struct intel_connector *intel_connector = + to_intel_connector(connector); connector->polled = intel_connector->polled; /* MST has a dynamic intel_connector->encoder and it's reprobing @@ -475,24 +501,62 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) continue; if (!connector->polled && I915_HAS_HOTPLUG(dev) && - intel_connector->encoder->hpd_pin > HPD_NONE) - connector->polled = DRM_CONNECTOR_POLL_HPD; + intel_connector->encoder->hpd_pin > HPD_NONE) { + connector->polled = enabled ? + DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT : + DRM_CONNECTOR_POLL_HPD; + } } + if (enabled) + drm_kms_helper_poll_enable_locked(dev); + + mutex_unlock(&dev->mode_config.mutex); + /* - * Interrupt setup is already guaranteed to be single-threaded, this is - * just to make the assert_spin_locked checks happy. + * We might have missed any hotplugs that happened while we were + * in the middle of disabling polling */ - spin_lock_irq(&dev_priv->irq_lock); - if (dev_priv->display.hpd_irq_setup) - dev_priv->display.hpd_irq_setup(dev); - spin_unlock_irq(&dev_priv->irq_lock); + if (!enabled) + drm_helper_hpd_irq_event(dev); +} + +/** + * intel_hpd_poll_init - enables/disables polling for connectors with hpd + * @dev_priv: i915 device instance + * @enabled: Whether to enable or disable polling + * + * This function enables polling for all connectors, regardless of whether or + * not they support hotplug detection. Under certain conditions HPD may not be + * functional. On most Intel GPUs, this happens when we enter runtime suspend. + * On Valleyview and Cherryview systems, this also happens when we shut off all + * of the powerwells. + * + * Since this function can get called in contexts where we're already holding + * dev->mode_config.mutex, we do the actual hotplug enabling in a seperate + * worker. + * + * Also see: intel_hpd_init(), which restores hpd handling. + */ +void intel_hpd_poll_init(struct drm_i915_private *dev_priv) +{ + WRITE_ONCE(dev_priv->hotplug.poll_enabled, true); + + /* + * We might already be holding dev->mode_config.mutex, so do this in a + * seperate worker + * As well, there's no issue if we race here since we always reschedule + * this worker anyway + */ + schedule_work(&dev_priv->hotplug.poll_init_work); } void intel_hpd_init_work(struct drm_i915_private *dev_priv) { INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func); INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func); + INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work); INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work, intel_hpd_irq_storm_reenable_work); } @@ -509,5 +573,33 @@ void intel_hpd_cancel_work(struct drm_i915_private *dev_priv) cancel_work_sync(&dev_priv->hotplug.dig_port_work); cancel_work_sync(&dev_priv->hotplug.hotplug_work); + cancel_work_sync(&dev_priv->hotplug.poll_init_work); cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work); } + +bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin) +{ + bool ret = false; + + if (pin == HPD_NONE) + return false; + + spin_lock_irq(&dev_priv->irq_lock); + if (dev_priv->hotplug.stats[pin].state == HPD_ENABLED) { + dev_priv->hotplug.stats[pin].state = HPD_DISABLED; + ret = true; + } + spin_unlock_irq(&dev_priv->irq_lock); + + return ret; +} + +void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin) +{ + if (pin == HPD_NONE) + return; + + spin_lock_irq(&dev_priv->irq_lock); + dev_priv->hotplug.stats[pin].state = HPD_ENABLED; + spin_unlock_irq(&dev_priv->irq_lock); +} |