drm/amd/display: Test HPD RX downstream handling

[WHAT]
handle_hpd_rx_irq() left its whole post-detect block untested
apart from a failing re-detect, and never dispatched a CP_IRQ.

[HOW]
Add four tests covering a failing connection-type probe, a
connector forced on that is emulated instead of detected, a successful
re-detect that notifies userspace, and a CP_IRQ that must be handed to
the HDCP work queue for the connector that raised it.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions