[PATCH v3 0/2] Fixup drm_atomic_helper_connector_hdmi_check()

[Cristian Ciocaltea]

Fix a NULL pointer dereference discovered while unloading a DRM module
and provide a test to make sure the helper works as expected in case the
connector's CRTC is shut down.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
Changes in v3:
- Drop the unnecessary test case changing bpc (Maxime)
- Link to v2: https://lore.kernel.org/r/20250109-hdmi-conn-null-mode-v2-0-9eeaf1109547@xxxxxxxxxxxxx

Changes in v2:
- Collected R-b tags from Dmitry and Angelo
- Add a 2nd patch providing a couple of KUnit tests (Maxime)
- Link to v1: https://lore.kernel.org/r/20250107-hdmi-conn-null-mode-v1-1-fff4be46d106@xxxxxxxxxxxxx

---
Cristian Ciocaltea (2):
      drm/connector: hdmi: Handle NULL display mode in state check helper
      drm/tests: hdmi: Add connector's CRTC deactivation test

 drivers/gpu/drm/display/drm_hdmi_state_helper.c    |  3 +
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 76 ++++++++++++++++++++++
 2 files changed, 79 insertions(+)
---
base-commit: 938fbb16aba8f7b88e0fdcf56f315a5bbad41aad
change-id: 20250107-hdmi-conn-null-mode-be0c5e49ed8c