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drm/i915: add DP 1.2 MST support (v0.7)

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This adds DP 1.2 MST support on Haswell systems.

Notes:
a) this reworks irq handling for DP MST ports, so that we can
avoid the mode config locking in the current hpd handlers, as
we need to process up/down msgs at a better time.

Changes since v0.1:
use PORT_PCH_HOTPLUG to detect short vs long pulses
add a workqueue to deal with digital events as they can get blocked on the
main workqueue beyong mode_config mutex
fix a bunch of modeset checker warnings
acks irqs in the driver
cleanup the MST encoders

Changes since v0.2:
check irq status again in work handler
move around bring up and tear down to fix DPMS on/off
use path properties.

Changes since v0.3:
updates for mst apis
more state checker fixes
irq handling improvements
fbcon handling support
improved reference counting of link - fixes redocking.

Changes since v0.4:
handle gpu reset hpd reinit without oopsing
check link status on HPD irqs
fix suspend/resume

Changes since v0.5:
use proper functions to get max link/lane counts
fix another checker backtrace - due to connectors disappearing.
set output type in more places fro, unknown->displayport
don't talk to devices if no HPD asserted
check mst on short irqs only
check link status properly
rebase onto prepping irq changes.
drop unsued force_act

Changes since v0.6:
cleanup unused struct entry.

[airlied: fix some sparse warnings].

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2014-05-02 14:02:48 +10:00
parent d05410f9a4
commit 0e32b39cee
12 changed files with 934 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/i915/i915_irq.c
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@@ -1846,7 +1846,7 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
* deadlock.
*/
if (queue_dig)
schedule_work(&dev_priv->dig_port_work);
queue_work(dev_priv->dp_wq, &dev_priv->dig_port_work);
if (queue_hp)
schedule_work(&dev_priv->hotplug_work);
}
@@ -4739,7 +4739,9 @@ void intel_hpd_init(struct drm_device *dev)
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct intel_connector *intel_connector = to_intel_connector(connector);
connector->polled = intel_connector->polled;
if (!connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
connector->polled = DRM_CONNECTOR_POLL_HPD;
if (intel_connector->mst_port)
connector->polled = DRM_CONNECTOR_POLL_HPD;
}