Re: [PATCH i-g-t v5 3/4] tests/intel/kms_dp_linktrain_fallback: Add UHBR-to-HBR fallback subtest

On 17-08-2026 13:56, Sowmiya S wrote:
> Add 'uhbr-to-hbr-fallback' to verify the 128b/132b->8b/10b encoding
> transition on UHBR-capable DP connectors by pinning the link at the
> highest sustainable UHBR rate, forcing LT_FAILURE_REDUCED_CAPS failures
> and asserting the rate drops below UHBR10. Supports SST and MST.
>
> v2: resets MST traversal state per test run (Kunal)
> v3: - use i915_dp_is_uhbr_rate()/i915_dp_get_next_lower_rate()
>        from lib
>      - single UHBR capability gate using max_link_rate after reset
>      - add igt_reset_connectors() on pin-loop early-return
>      - hard-assert for 'fallback not reached'
>      - remove dead run_dsc reset; merge run_* funcs
>      - fix link rate log units (10 kbit/s).
>      - Extend run_lt_fallback_test() with a force_uhbr parameter
>      - and remove the duplicate run_uhbr_to_hbr_fallback_test()
>        (Kunal)
>
> Signed-off-by: Sowmiya S <[email protected]>
Fold patch 4 here with that
Reviewed-by: Kunal Joshi <[email protected]>