These patches handle the DP link training failure during atomic modeset. A new connector property is defined to indicate if link training retry is requested on failure. If link training fails, we set this connector property and send a hotplug uevent that gets exceuted after the current modeset is completed an dlocks are released. The userspace is expected to monitor this connector property to detect a change in connector and trigger a full modeset. Here changes are made in fb_dev to monitor this property as well as the atomic check modeset to use this new property to detect a change. In the modeset retry, the modes are validated based on link rate lower than the failed link rate and link is retrained at lower link rate.
Manasi Navare (7): drm: Add a link_train_retry field to drm_connector drm: Define a work struct for scheduling a uevent for modeset retry drm: Trigger a complete modeset if link_train_retry is set drm/i915; Add a function to return index of link rate drm/i915: Define the modeset retry work function drm/i915: Link Rate fallback on Link training failure drm/i915: Add support for DP link training compliance
Navare, Manasi D (1): drm/i915: Change the placement of some static functions in intel_dp.c
drivers/gpu/drm/drm_atomic_helper.c | 9 + drivers/gpu/drm/drm_fb_helper.c | 3 +- drivers/gpu/drm/i915/intel_ddi.c | 14 +- drivers/gpu/drm/i915/intel_dp.c | 286 ++++++++++++++++++-------- drivers/gpu/drm/i915/intel_dp_link_training.c | 12 +- drivers/gpu/drm/i915/intel_drv.h | 8 +- include/drm/drm_connector.h | 10 + 7 files changed, 249 insertions(+), 93 deletions(-)