[igt-dev] [PATCH i-g-t 0/4] Chamelium and TypeC

[Arkadiusz Hiler]

With DP over TypeC there is a behavior change - now we need to disable the mode
for our connector to get any hotplug events from it.

Imre is working on making the kernel side changes[0] to make TypeC behave same a
a native DP but he is hitting issues with DDI timeouts[1]. Anyway, the new
behavior is not entirely wrong either.

The fallout when testing with chamelium (this includes all the kms_ tests where
chamelium is used as a simple display) is quite extensive. We get a lot of flip
flopping skips and straight up failures because the displays are not getting
recognized.

Regular userspace, on the other hand, issues disabling modeset each time we get
a disconnect so we don't see any similar in the wild - this series makes our
tests mimic that common behavior - we always start with disalbed modes and up to
date connector state.

To not loose any coverage I have also added test that verifies hotplugs
while stuck with enabled mode explicitly.

[0]: https://patchwork.freedesktop.org/series/75027/
[1]: https://gitlab.freedesktop.org/drm/intel/-/issues/1069

Arkadiusz Hiler (4):
  lib/kms: Commit reasonable defaults on display init
  lib/kms: Reprobe connector state after disabling modest
  tests/kms_chamelium: Issue disabling modeset when resetting state
  tests/kms_chamelium: Test HPD for different mode handling scenarios

 lib/igt_kms.c         |  28 +++-
 tests/kms_chamelium.c | 294 ++++++++++++++++++++++++++++--------------
 2 files changed, 219 insertions(+), 103 deletions(-)

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2.24.1