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![Jani Nikula](/assets/img/avatar_default.png)
With intel_hpd_irq_setup() in i915_irq.c, struct intel_hotplug_funcs is also only needed there. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/9a10dbca7ad298dde62b83f76e0df43a67bceeef.1643896905.git.jani.nikula@intel.com
768 lines
24 KiB
C
768 lines
24 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include "i915_drv.h"
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#include "i915_irq.h"
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#include "intel_display_types.h"
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#include "intel_hotplug.h"
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/**
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* DOC: Hotplug
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*
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* Simply put, hotplug occurs when a display is connected to or disconnected
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* from the system. However, there may be adapters and docking stations and
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* Display Port short pulses and MST devices involved, complicating matters.
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*
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* Hotplug in i915 is handled in many different levels of abstraction.
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*
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* The platform dependent interrupt handling code in i915_irq.c enables,
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* disables, and does preliminary handling of the interrupts. The interrupt
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* handlers gather the hotplug detect (HPD) information from relevant registers
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* into a platform independent mask of hotplug pins that have fired.
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*
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* The platform independent interrupt handler intel_hpd_irq_handler() in
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* intel_hotplug.c does hotplug irq storm detection and mitigation, and passes
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* further processing to appropriate bottom halves (Display Port specific and
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* regular hotplug).
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*
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* The Display Port work function i915_digport_work_func() calls into
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* intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long
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* pulses, with failures and non-MST long pulses triggering regular hotplug
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* processing on the connector.
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*
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* The regular hotplug work function i915_hotplug_work_func() calls connector
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* detect hooks, and, if connector status changes, triggers sending of hotplug
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* uevent to userspace via drm_kms_helper_hotplug_event().
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*
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* Finally, the userspace is responsible for triggering a modeset upon receiving
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* the hotplug uevent, disabling or enabling the crtc as needed.
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*
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* The hotplug interrupt storm detection and mitigation code keeps track of the
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* number of interrupts per hotplug pin per a period of time, and if the number
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* of interrupts exceeds a certain threshold, the interrupt is disabled for a
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* while before being re-enabled. The intention is to mitigate issues raising
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* from broken hardware triggering massive amounts of interrupts and grinding
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* the system to a halt.
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*
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* Current implementation expects that hotplug interrupt storm will not be
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* seen when display port sink is connected, hence on platforms whose DP
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* callback is handled by i915_digport_work_func reenabling of hpd is not
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* performed (it was never expected to be disabled in the first place ;) )
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* this is specific to DP sinks handled by this routine and any other display
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* such as HDMI or DVI enabled on the same port will have proper logic since
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* it will use i915_hotplug_work_func where this logic is handled.
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*/
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/**
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* intel_hpd_pin_default - return default pin associated with certain port.
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* @dev_priv: private driver data pointer
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* @port: the hpd port to get associated pin
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*
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* It is only valid and used by digital port encoder.
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*
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* Return pin that is associatade with @port.
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*/
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enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
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enum port port)
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{
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return HPD_PORT_A + port - PORT_A;
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}
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#define HPD_STORM_DETECT_PERIOD 1000
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#define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
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#define HPD_RETRY_DELAY 1000
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static enum hpd_pin
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intel_connector_hpd_pin(struct intel_connector *connector)
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{
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struct intel_encoder *encoder = intel_attached_encoder(connector);
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/*
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* MST connectors get their encoder attached dynamically
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* so need to make sure we have an encoder here. But since
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* MST encoders have their hpd_pin set to HPD_NONE we don't
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* have to special case them beyond that.
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*/
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return encoder ? encoder->hpd_pin : HPD_NONE;
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}
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/**
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* intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
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* @dev_priv: private driver data pointer
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* @pin: the pin to gather stats on
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* @long_hpd: whether the HPD IRQ was long or short
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*
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* Gather stats about HPD IRQs from the specified @pin, and detect IRQ
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* storms. Only the pin specific stats and state are changed, the caller is
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* responsible for further action.
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*
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* The number of IRQs that are allowed within @HPD_STORM_DETECT_PERIOD is
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* stored in @dev_priv->hotplug.hpd_storm_threshold which defaults to
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* @HPD_STORM_DEFAULT_THRESHOLD. Long IRQs count as +10 to this threshold, and
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* short IRQs count as +1. If this threshold is exceeded, it's considered an
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* IRQ storm and the IRQ state is set to @HPD_MARK_DISABLED.
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*
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* By default, most systems will only count long IRQs towards
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* &dev_priv->hotplug.hpd_storm_threshold. However, some older systems also
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* suffer from short IRQ storms and must also track these. Because short IRQ
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* storms are naturally caused by sideband interactions with DP MST devices,
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* short IRQ detection is only enabled for systems without DP MST support.
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* Systems which are new enough to support DP MST are far less likely to
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* suffer from IRQ storms at all, so this is fine.
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*
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* The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs,
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* and should only be adjusted for automated hotplug testing.
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*
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* Return true if an IRQ storm was detected on @pin.
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*/
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static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
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enum hpd_pin pin, bool long_hpd)
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{
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struct i915_hotplug *hpd = &dev_priv->hotplug;
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unsigned long start = hpd->stats[pin].last_jiffies;
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unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
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const int increment = long_hpd ? 10 : 1;
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const int threshold = hpd->hpd_storm_threshold;
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bool storm = false;
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if (!threshold ||
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(!long_hpd && !dev_priv->hotplug.hpd_short_storm_enabled))
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return false;
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if (!time_in_range(jiffies, start, end)) {
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hpd->stats[pin].last_jiffies = jiffies;
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hpd->stats[pin].count = 0;
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}
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hpd->stats[pin].count += increment;
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if (hpd->stats[pin].count > threshold) {
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hpd->stats[pin].state = HPD_MARK_DISABLED;
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drm_dbg_kms(&dev_priv->drm,
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"HPD interrupt storm detected on PIN %d\n", pin);
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storm = true;
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} else {
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drm_dbg_kms(&dev_priv->drm,
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"Received HPD interrupt on PIN %d - cnt: %d\n",
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pin,
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hpd->stats[pin].count);
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}
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return storm;
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}
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static void
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intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
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{
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struct drm_device *dev = &dev_priv->drm;
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struct drm_connector_list_iter conn_iter;
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struct intel_connector *connector;
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bool hpd_disabled = false;
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lockdep_assert_held(&dev_priv->irq_lock);
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drm_connector_list_iter_begin(dev, &conn_iter);
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for_each_intel_connector_iter(connector, &conn_iter) {
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enum hpd_pin pin;
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if (connector->base.polled != DRM_CONNECTOR_POLL_HPD)
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continue;
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pin = intel_connector_hpd_pin(connector);
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if (pin == HPD_NONE ||
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dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
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continue;
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drm_info(&dev_priv->drm,
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"HPD interrupt storm detected on connector %s: "
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"switching from hotplug detection to polling\n",
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connector->base.name);
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dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
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connector->base.polled = DRM_CONNECTOR_POLL_CONNECT |
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DRM_CONNECTOR_POLL_DISCONNECT;
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hpd_disabled = true;
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}
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drm_connector_list_iter_end(&conn_iter);
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/* Enable polling and queue hotplug re-enabling. */
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if (hpd_disabled) {
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drm_kms_helper_poll_enable(dev);
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mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
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msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
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}
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}
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static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, typeof(*dev_priv),
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hotplug.reenable_work.work);
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struct drm_device *dev = &dev_priv->drm;
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struct drm_connector_list_iter conn_iter;
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struct intel_connector *connector;
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intel_wakeref_t wakeref;
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enum hpd_pin pin;
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wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
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spin_lock_irq(&dev_priv->irq_lock);
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drm_connector_list_iter_begin(dev, &conn_iter);
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for_each_intel_connector_iter(connector, &conn_iter) {
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pin = intel_connector_hpd_pin(connector);
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if (pin == HPD_NONE ||
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dev_priv->hotplug.stats[pin].state != HPD_DISABLED)
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continue;
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if (connector->base.polled != connector->polled)
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drm_dbg(&dev_priv->drm,
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"Reenabling HPD on connector %s\n",
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connector->base.name);
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connector->base.polled = connector->polled;
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}
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drm_connector_list_iter_end(&conn_iter);
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for_each_hpd_pin(pin) {
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if (dev_priv->hotplug.stats[pin].state == HPD_DISABLED)
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dev_priv->hotplug.stats[pin].state = HPD_ENABLED;
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}
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intel_hpd_irq_setup(dev_priv);
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spin_unlock_irq(&dev_priv->irq_lock);
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intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
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}
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enum intel_hotplug_state
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intel_encoder_hotplug(struct intel_encoder *encoder,
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struct intel_connector *connector)
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{
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struct drm_device *dev = connector->base.dev;
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enum drm_connector_status old_status;
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u64 old_epoch_counter;
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bool ret = false;
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drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
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old_status = connector->base.status;
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old_epoch_counter = connector->base.epoch_counter;
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connector->base.status =
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drm_helper_probe_detect(&connector->base, NULL, false);
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if (old_epoch_counter != connector->base.epoch_counter)
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ret = true;
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if (ret) {
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drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s (epoch counter %llu->%llu)\n",
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connector->base.base.id,
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connector->base.name,
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drm_get_connector_status_name(old_status),
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drm_get_connector_status_name(connector->base.status),
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old_epoch_counter,
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connector->base.epoch_counter);
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return INTEL_HOTPLUG_CHANGED;
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}
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return INTEL_HOTPLUG_UNCHANGED;
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}
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static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
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{
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return intel_encoder_is_dig_port(encoder) &&
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enc_to_dig_port(encoder)->hpd_pulse != NULL;
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}
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static void i915_digport_work_func(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, struct drm_i915_private, hotplug.dig_port_work);
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u32 long_port_mask, short_port_mask;
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struct intel_encoder *encoder;
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u32 old_bits = 0;
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spin_lock_irq(&dev_priv->irq_lock);
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long_port_mask = dev_priv->hotplug.long_port_mask;
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dev_priv->hotplug.long_port_mask = 0;
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short_port_mask = dev_priv->hotplug.short_port_mask;
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dev_priv->hotplug.short_port_mask = 0;
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spin_unlock_irq(&dev_priv->irq_lock);
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for_each_intel_encoder(&dev_priv->drm, encoder) {
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struct intel_digital_port *dig_port;
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enum port port = encoder->port;
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bool long_hpd, short_hpd;
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enum irqreturn ret;
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if (!intel_encoder_has_hpd_pulse(encoder))
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continue;
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long_hpd = long_port_mask & BIT(port);
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short_hpd = short_port_mask & BIT(port);
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if (!long_hpd && !short_hpd)
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continue;
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dig_port = enc_to_dig_port(encoder);
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ret = dig_port->hpd_pulse(dig_port, long_hpd);
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if (ret == IRQ_NONE) {
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/* fall back to old school hpd */
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old_bits |= BIT(encoder->hpd_pin);
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}
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}
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if (old_bits) {
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spin_lock_irq(&dev_priv->irq_lock);
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dev_priv->hotplug.event_bits |= old_bits;
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spin_unlock_irq(&dev_priv->irq_lock);
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queue_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work, 0);
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}
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}
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/**
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* intel_hpd_trigger_irq - trigger an hpd irq event for a port
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* @dig_port: digital port
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*
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* Trigger an HPD interrupt event for the given port, emulating a short pulse
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* generated by the sink, and schedule the dig port work to handle it.
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*/
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void intel_hpd_trigger_irq(struct intel_digital_port *dig_port)
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{
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struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
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spin_lock_irq(&i915->irq_lock);
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i915->hotplug.short_port_mask |= BIT(dig_port->base.port);
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spin_unlock_irq(&i915->irq_lock);
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queue_work(i915->hotplug.dp_wq, &i915->hotplug.dig_port_work);
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}
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/*
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* Handle hotplug events outside the interrupt handler proper.
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*/
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static void i915_hotplug_work_func(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, struct drm_i915_private,
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hotplug.hotplug_work.work);
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struct drm_device *dev = &dev_priv->drm;
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struct drm_connector_list_iter conn_iter;
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struct intel_connector *connector;
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u32 changed = 0, retry = 0;
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u32 hpd_event_bits;
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u32 hpd_retry_bits;
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mutex_lock(&dev->mode_config.mutex);
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drm_dbg_kms(&dev_priv->drm, "running encoder hotplug functions\n");
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spin_lock_irq(&dev_priv->irq_lock);
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hpd_event_bits = dev_priv->hotplug.event_bits;
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dev_priv->hotplug.event_bits = 0;
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hpd_retry_bits = dev_priv->hotplug.retry_bits;
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dev_priv->hotplug.retry_bits = 0;
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/* Enable polling for connectors which had HPD IRQ storms */
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intel_hpd_irq_storm_switch_to_polling(dev_priv);
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spin_unlock_irq(&dev_priv->irq_lock);
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drm_connector_list_iter_begin(dev, &conn_iter);
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for_each_intel_connector_iter(connector, &conn_iter) {
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enum hpd_pin pin;
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u32 hpd_bit;
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pin = intel_connector_hpd_pin(connector);
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if (pin == HPD_NONE)
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continue;
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hpd_bit = BIT(pin);
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if ((hpd_event_bits | hpd_retry_bits) & hpd_bit) {
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struct intel_encoder *encoder =
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intel_attached_encoder(connector);
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if (hpd_event_bits & hpd_bit)
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connector->hotplug_retries = 0;
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else
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connector->hotplug_retries++;
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drm_dbg_kms(&dev_priv->drm,
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"Connector %s (pin %i) received hotplug event. (retry %d)\n",
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connector->base.name, pin,
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connector->hotplug_retries);
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switch (encoder->hotplug(encoder, connector)) {
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case INTEL_HOTPLUG_UNCHANGED:
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break;
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case INTEL_HOTPLUG_CHANGED:
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changed |= hpd_bit;
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break;
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case INTEL_HOTPLUG_RETRY:
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retry |= hpd_bit;
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break;
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}
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}
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}
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drm_connector_list_iter_end(&conn_iter);
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mutex_unlock(&dev->mode_config.mutex);
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if (changed)
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drm_kms_helper_hotplug_event(dev);
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/* Remove shared HPD pins that have changed */
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retry &= ~changed;
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if (retry) {
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spin_lock_irq(&dev_priv->irq_lock);
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dev_priv->hotplug.retry_bits |= retry;
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spin_unlock_irq(&dev_priv->irq_lock);
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mod_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work,
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msecs_to_jiffies(HPD_RETRY_DELAY));
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}
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}
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/**
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* intel_hpd_irq_handler - main hotplug irq handler
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* @dev_priv: drm_i915_private
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* @pin_mask: a mask of hpd pins that have triggered the irq
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* @long_mask: a mask of hpd pins that may be long hpd pulses
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*
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* This is the main hotplug irq handler for all platforms. The platform specific
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* irq handlers call the platform specific hotplug irq handlers, which read and
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* decode the appropriate registers into bitmasks about hpd pins that have
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* triggered (@pin_mask), and which of those pins may be long pulses
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|
* (@long_mask). The @long_mask is ignored if the port corresponding to the pin
|
|
* is not a digital port.
|
|
*
|
|
* Here, we do hotplug irq storm detection and mitigation, and pass further
|
|
* processing to appropriate bottom halves.
|
|
*/
|
|
void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
|
|
u32 pin_mask, u32 long_mask)
|
|
{
|
|
struct intel_encoder *encoder;
|
|
bool storm_detected = false;
|
|
bool queue_dig = false, queue_hp = false;
|
|
u32 long_hpd_pulse_mask = 0;
|
|
u32 short_hpd_pulse_mask = 0;
|
|
enum hpd_pin pin;
|
|
|
|
if (!pin_mask)
|
|
return;
|
|
|
|
spin_lock(&dev_priv->irq_lock);
|
|
|
|
/*
|
|
* Determine whether ->hpd_pulse() exists for each pin, and
|
|
* whether we have a short or a long pulse. This is needed
|
|
* as each pin may have up to two encoders (HDMI and DP) and
|
|
* only the one of them (DP) will have ->hpd_pulse().
|
|
*/
|
|
for_each_intel_encoder(&dev_priv->drm, encoder) {
|
|
enum port port = encoder->port;
|
|
bool long_hpd;
|
|
|
|
pin = encoder->hpd_pin;
|
|
if (!(BIT(pin) & pin_mask))
|
|
continue;
|
|
|
|
if (!intel_encoder_has_hpd_pulse(encoder))
|
|
continue;
|
|
|
|
long_hpd = long_mask & BIT(pin);
|
|
|
|
drm_dbg(&dev_priv->drm,
|
|
"digital hpd on [ENCODER:%d:%s] - %s\n",
|
|
encoder->base.base.id, encoder->base.name,
|
|
long_hpd ? "long" : "short");
|
|
queue_dig = true;
|
|
|
|
if (long_hpd) {
|
|
long_hpd_pulse_mask |= BIT(pin);
|
|
dev_priv->hotplug.long_port_mask |= BIT(port);
|
|
} else {
|
|
short_hpd_pulse_mask |= BIT(pin);
|
|
dev_priv->hotplug.short_port_mask |= BIT(port);
|
|
}
|
|
}
|
|
|
|
/* Now process each pin just once */
|
|
for_each_hpd_pin(pin) {
|
|
bool long_hpd;
|
|
|
|
if (!(BIT(pin) & pin_mask))
|
|
continue;
|
|
|
|
if (dev_priv->hotplug.stats[pin].state == HPD_DISABLED) {
|
|
/*
|
|
* On GMCH platforms the interrupt mask bits only
|
|
* prevent irq generation, not the setting of the
|
|
* hotplug bits itself. So only WARN about unexpected
|
|
* interrupts on saner platforms.
|
|
*/
|
|
drm_WARN_ONCE(&dev_priv->drm, !HAS_GMCH(dev_priv),
|
|
"Received HPD interrupt on pin %d although disabled\n",
|
|
pin);
|
|
continue;
|
|
}
|
|
|
|
if (dev_priv->hotplug.stats[pin].state != HPD_ENABLED)
|
|
continue;
|
|
|
|
/*
|
|
* Delegate to ->hpd_pulse() if one of the encoders for this
|
|
* pin has it, otherwise let the hotplug_work deal with this
|
|
* pin directly.
|
|
*/
|
|
if (((short_hpd_pulse_mask | long_hpd_pulse_mask) & BIT(pin))) {
|
|
long_hpd = long_hpd_pulse_mask & BIT(pin);
|
|
} else {
|
|
dev_priv->hotplug.event_bits |= BIT(pin);
|
|
long_hpd = true;
|
|
queue_hp = true;
|
|
}
|
|
|
|
if (intel_hpd_irq_storm_detect(dev_priv, pin, long_hpd)) {
|
|
dev_priv->hotplug.event_bits &= ~BIT(pin);
|
|
storm_detected = true;
|
|
queue_hp = true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable any IRQs that storms were detected on. Polling enablement
|
|
* happens later in our hotplug work.
|
|
*/
|
|
if (storm_detected)
|
|
intel_hpd_irq_setup(dev_priv);
|
|
spin_unlock(&dev_priv->irq_lock);
|
|
|
|
/*
|
|
* Our hotplug handler can grab modeset locks (by calling down into the
|
|
* fb helpers). Hence it must not be run on our own dev-priv->wq work
|
|
* queue for otherwise the flush_work in the pageflip code will
|
|
* deadlock.
|
|
*/
|
|
if (queue_dig)
|
|
queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
|
|
if (queue_hp)
|
|
queue_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work, 0);
|
|
}
|
|
|
|
/**
|
|
* intel_hpd_init - initializes and enables hpd support
|
|
* @dev_priv: i915 device instance
|
|
*
|
|
* This function enables the hotplug support. It requires that interrupts have
|
|
* already been enabled with intel_irq_init_hw(). From this point on hotplug and
|
|
* poll request can run concurrently to other code, so locking rules must be
|
|
* obeyed.
|
|
*
|
|
* 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_enable() and intel_hpd_poll_disable().
|
|
*/
|
|
void intel_hpd_init(struct drm_i915_private *dev_priv)
|
|
{
|
|
int i;
|
|
|
|
if (!HAS_DISPLAY(dev_priv))
|
|
return;
|
|
|
|
for_each_hpd_pin(i) {
|
|
dev_priv->hotplug.stats[i].count = 0;
|
|
dev_priv->hotplug.stats[i].state = HPD_ENABLED;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
intel_hpd_irq_setup(dev_priv);
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
}
|
|
|
|
static 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_connector_list_iter conn_iter;
|
|
struct intel_connector *connector;
|
|
bool enabled;
|
|
|
|
mutex_lock(&dev->mode_config.mutex);
|
|
|
|
enabled = READ_ONCE(dev_priv->hotplug.poll_enabled);
|
|
|
|
drm_connector_list_iter_begin(dev, &conn_iter);
|
|
for_each_intel_connector_iter(connector, &conn_iter) {
|
|
enum hpd_pin pin;
|
|
|
|
pin = intel_connector_hpd_pin(connector);
|
|
if (pin == HPD_NONE)
|
|
continue;
|
|
|
|
connector->base.polled = connector->polled;
|
|
|
|
if (enabled && connector->base.polled == DRM_CONNECTOR_POLL_HPD)
|
|
connector->base.polled = DRM_CONNECTOR_POLL_CONNECT |
|
|
DRM_CONNECTOR_POLL_DISCONNECT;
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
|
|
if (enabled)
|
|
drm_kms_helper_poll_enable(dev);
|
|
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
/*
|
|
* We might have missed any hotplugs that happened while we were
|
|
* in the middle of disabling polling
|
|
*/
|
|
if (!enabled)
|
|
drm_helper_hpd_irq_event(dev);
|
|
}
|
|
|
|
/**
|
|
* intel_hpd_poll_enable - enable polling for connectors with hpd
|
|
* @dev_priv: i915 device instance
|
|
*
|
|
* This function enables polling for all connectors which support HPD.
|
|
* 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() and intel_hpd_poll_disable().
|
|
*/
|
|
void intel_hpd_poll_enable(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (!HAS_DISPLAY(dev_priv))
|
|
return;
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* intel_hpd_poll_disable - disable polling for connectors with hpd
|
|
* @dev_priv: i915 device instance
|
|
*
|
|
* This function disables polling for all connectors which support HPD.
|
|
* 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 used during driver init to initialize connector->polled
|
|
* appropriately for all connectors.
|
|
*
|
|
* Also see: intel_hpd_init() and intel_hpd_poll_enable().
|
|
*/
|
|
void intel_hpd_poll_disable(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (!HAS_DISPLAY(dev_priv))
|
|
return;
|
|
|
|
WRITE_ONCE(dev_priv->hotplug.poll_enabled, false);
|
|
schedule_work(&dev_priv->hotplug.poll_init_work);
|
|
}
|
|
|
|
void intel_hpd_init_work(struct drm_i915_private *dev_priv)
|
|
{
|
|
INIT_DELAYED_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);
|
|
}
|
|
|
|
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (!HAS_DISPLAY(dev_priv))
|
|
return;
|
|
|
|
spin_lock_irq(&dev_priv->irq_lock);
|
|
|
|
dev_priv->hotplug.long_port_mask = 0;
|
|
dev_priv->hotplug.short_port_mask = 0;
|
|
dev_priv->hotplug.event_bits = 0;
|
|
dev_priv->hotplug.retry_bits = 0;
|
|
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
|
|
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
|
|
cancel_delayed_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);
|
|
}
|