[PATCH i-g-t 0/2] tests/amdgpu/amd_replay: Add Replay Rate Control test

[Ray Wu <ray.wu@amd.com>]

This series adds an IGT subtest for Panel Replay's rate control feature
on AMD eDP panels, and fixes a few pre-existing logic bugs in
amd_replay that were uncovered while reviewing the new test.

Panel Replay rate control extends the panel's coasting vtotal while the
screen is static (lowering refresh rate for power savings) and restores
it once live updates resume. The behaviour is observable through the
per-connector replay_coasting_vtotal debugfs node, but is currently not
exercised by IGT, so silent regressions in either the driver state
machine or the panel firmware are possible.

Patch 1 is a pure bug fix for existing replay subtests:
  - The `test_mode == (A || B)` and `test_mode == A || B` conditionals
    in page_flip_test() / run_check_replay() always evaluated truthy,
    so the guarded state checks ran regardless of test_mode.
  - Three igt_fail_on_f() range checks combined `state < N` with
    `state >= N+1` using `&&`, which can never be true; those
    assertions effectively never fired.
  - Two "mdoe" -> "mode" typos in igt_describe() strings.

Patch 2 adds the new test on top:
  - Two helpers in lib/igt_amd:
      * igt_amd_replay_support_rate_control() returns true when the
        connector's replay_capability advertises
        "Rate control support: yes".
      * igt_amd_read_replay_coasting_vtotal() reads
        replay_coasting_vtotal; returns 0 on success or -errno on
        failure.
  - A new "replay_rate_control" subtest:
      1. Drive page flips so Panel Replay engages.
      2. Wait for the screen to settle, sample static coasting vtotal.
      3. Drive page flips to put replay back into live mode, sample
         live coasting vtotal.
      4. Assert static > live (lower refresh rate while static).


Ray Wu (2):
  tests/amdgpu/amd_replay: fix operator precedence and typos
  tests/amdgpu/amd_replay: add Replay Rate Control IGT test

 lib/igt_amd.c             |  93 +++++++++++++++++++++++++++++++
 lib/igt_amd.h             |   3 +
 tests/amdgpu/amd_replay.c | 114 ++++++++++++++++++++++++++++++++++----
 3 files changed, 199 insertions(+), 11 deletions(-)

-- 
2.43.0