drm/i915/dp: Handle the DOWNSTREAM_PORT_STATUS_CHANGED event

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Handle the DOWNSTREAM_PORT_STATUS_CHANGED event a branch device can use
to indicate the state change of a DFP connector on the branch device.
The event is signaled in the DP_LANE_ALIGN_STATUS_UPDATED DPCD register
setting a clear-on-read flag and triggering an HPD IRQ. Accordingly keep
a cached version of the flag, updating it whenever
DP_LANE_ALIGN_STATUS_UPDATED is read. Schedule a full connector
detection from the HPD IRQ handler if the cached flag is set and clear
the cached flag at the start of detection.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-7-imre.deak@intel.com

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Imre Deak 2026-02-25 18:46:04 +02:00

parent e55791f5b7

commit a6d89d46d3

2 changed files with 16 additions and 1 deletions

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1

drivers/gpu/drm/i915/display/intel_display_types.h

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16

drivers/gpu/drm/i915/display/intel_dp.c

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