The following two patches try to prevent a system hang when a modeset is forced by userspace (Weston) on legacy Type-C ports that are disconnected. This issue was accidentally discovered while trying to modeset one of the HDMI ports on the TGL based Gigabyte system (https://www.gigabyte.com/Mini-PcBarebone/GB-BSi3-1115G4-rev-10#ov) using the following Weston settings (configured via weston.ini): [output] name=HDMI-A-3 mode=173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync force-on=true Entering the name of the HDMI connector incorrectly above (for example HDMI-A-3 (disconnected) instead of HDMI-A-2 (connected)) lead to warnings in the log followed by a system hang. To fix this issue, the first patch prevents the selection of TBT PLL for legacy Type-C ports and the second one rejects any attempts to modeset disconnected Type-C ports. Cc: Imre Deak <imre.deak@xxxxxxxxx> Cc: José Roberto de Souza <jose.souza@xxxxxxxxx> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Vivek Kasireddy (2): drm/i915/tc: Don't default disconnected legacy Type-C ports to TBT mode drm/i915: Reject the atomic modeset if an associated Type-C port is disconnected drivers/gpu/drm/i915/display/intel_atomic.c | 20 ++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_tc.c | 3 ++- 2 files changed, 22 insertions(+), 1 deletion(-) -- 2.35.1
