tree c4e9f73624295c2371eb29cfeaef37dfa9439f3a
parent 2b9ee5d79e1e6648436ce0ad542ed96966519b82
author zhaojohn <john.zhao@intel.com> 1668659821 -0800
committer Martin L Roth <gaumless@gmail.com> 1668870543 +0000

soc/intel/common: Fix the TCSS DisplayPort detection flow

After DisplayPort is plugged into type-C port, its hpd signal
instantly presents and EC has mux_info for dp and hpd. This change
fixes the DP detection flow to avoid the 1 second delay while no DP
is connected. If DP is present, there will be requests towards PMC
through the sequence of connect, safe mode, dp and hpd mode.

BUG=b:247670186
TEST=Built image and validated the DisplayPort preboot feature on Rex.

Change-Id: I7cb95ec7fcc7e1a86e86466e6d45390eedcc4531
Signed-off-by: zhaojohn <john.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69694
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>