Link training failure is handled by lowering the link rate/lane count as per the Dp Spec 1.2 and sending a hotplug uevent to userspace to notify that it needs to redo a modeset. This is notified by setting connector link status property which should be tracked by userspace to take the action. This behaviour complies with Dp spec as tested by DP compliance test suite. Manasi Navare (4): drm: Add a new connector property for link status drm/i915: Set link status property for DP connector drm/i915: Find fallback link rate/lane count drm/i915: Implement Link Rate fallback on Link training failure drivers/gpu/drm/drm_atomic_helper.c | 4 + drivers/gpu/drm/drm_connector.c | 17 ++++ drivers/gpu/drm/i915/intel_ddi.c | 23 ++++- drivers/gpu/drm/i915/intel_dp.c | 128 +++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_dp_link_training.c | 12 ++- drivers/gpu/drm/i915/intel_drv.h | 13 ++- include/drm/drm_connector.h | 4 +- include/drm/drm_crtc.h | 5 + include/uapi/drm/drm_mode.h | 4 + 9 files changed, 201 insertions(+), 9 deletions(-) -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
