On Thu, Jan 07, 2016 at 10:43:28AM -0500, Lyude wrote:
This fixes reprobing of display connectors on resume. After some talking with danvet on IRC, I learned that calling drm_helper_hpd_irq_event() does actually trigger a full reprobe of each connector's status. It turns out this is the actual reason reprobing on resume hasn't been working (this was observed on a T440s):
- We call hpd_init()
- We check each connector for a couple of things before marking connector->polled with DRM_CONNECTOR_POLL_HPD, one of which is an active encoder. Of course, a disconnected port won't have an active encoder, so we don't add the flag to any of the connectors.
- We call drm_helper_hpd_irq_event()
- drm_helper_irq_event() checks each connector for the DRM_CONNECTOR_POLL_HPD flag. The only one that has it is eDP-1, so we skip reprobing each connector except that one.
In addition, we also now avoid setting connector->polled to DRM_CONNECTOR_POLL_HPD for MST connectors, since their reprobing is handled by the mst helpers. This is probably what was originally intended to happen here.
Changes since V1:
- Use the explanation of the issue as the commit message instead
- Change the title of the commit, since this does more then just stop a check for an encoder now
- Add "Fixes" line for the patch that introduced this regression
- Don't enable DRM_CONNECTOR_POLL_HPD for mst connectors
Changes since V2:
- Put patch changelog above Signed-off-by
- Follow Daniel Vetter's suggestion for making the code here a bit more legible
Fixes: 0e32b39ceed6 ("drm/i915: add DP 1.2 MST support (v0.7)") Cc: stable@vger.kernel.org Signed-off-by: Lyude cpaul@redhat.com
Awesome, and merged to drm-intel.
Thanks, Daniel
drivers/gpu/drm/i915/intel_hotplug.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index b177857..d7a6437 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -468,9 +468,14 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) 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->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)connector->polled = DRM_CONNECTOR_POLL_HPD;
/* MST has a dynamic intel_connector->encoder and it's reprobing* is all handled by the MST helpers. */continue;if (!connector->polled && I915_HAS_HOTPLUG(dev) &&intel_connector->encoder->hpd_pin > HPD_NONE) connector->polled = DRM_CONNECTOR_POLL_HPD;-- 2.5.0
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