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[WHY & HOW] The response of DP BW allocation is handled in Outbox ISR. When it failed to request the DP BW allocation, it sent another DPCD request in Outbox ISR immediately. The DP AUX reply also uses the Outbox ISR. So, no AUX reply happened in this case. Change to use HPD IRQ for the notification. Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com> Signed-off-by: Cruise Hung <Cruise.Hung@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>