eDP 1.5/1.4b

An independent clean-room eDP 1.5/1.4b link bring-up VIP: a source BFM, a separately written panel BFM that publishes its own rate table and runs its own descrambler, and a passive checker (“edp15/, make edp15_oss, 17/17 checks). It targets the two things eDP 1.4b/1.5 has that NOTHING else in this catalog verifies: (1) the eDP LINK-RATE TABLE — the panel publishes a table of supported rates and the source selects one BY INDEX (LINK_RATE_SET), a method mutually exclusive with DisplayPort’s bandwidth code and absent from DP entirely, so indexing past the end or mixing the two methods is a real bug no DP-generation VIP looks for; and (2) ASSR, the Alternate Scrambler Seed Reset, where both ends must agree on the seed. PSR is deliberately NOT re-modelled here — vip-edp2 covers it and the 1.x state machine is a subset — rather than listed twice to pad a feature list. SCOPE: the link layer is vip-dp20 (8b/10b) / vip-dp21 (UHBR); DPCD traffic is modelled as typed transactions because vip-dp20 owns the AUX wire format; no eDP panel controller exists here, so it is a BFM<->BFM self-check. The VIP’s sharpest result is a NEGATIVE one: a source that advertises ASSR and then scrambles with the STANDARD seed produces a DPCD handshake byte-identical to a correct one, so the passive checker is blind by construction — T8 asserts that silence while the panel’s independent descrambler recovers garbage.

Key Features

• eDP LINK_RATE_SET selection by index into the panel’s published SUPPORTED_LINK_RATES table
• Mutual exclusion with the DP LINK_BW_SET bandwidth code — the eDP-specific rule
• ASSR alternate-scrambler-seed negotiation, with an independent panel-side descrambler
• Four injected faults; the fourth is invisible to the checker by construction and the TB asserts it

Standards & Compliance

VESA Embedded DisplayPort (eDP) 1.5 / 1.4b

Pairs With

Built to lean against these catalog IPs during integration:

• dp_link