drm/i915/dp: Add debugfs entry to force link retrain

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Add a connector debugfs entry to force retrain an active link. This can
be used to test both custom link parameters (previously forced via the
force_link_rate/lane_count entries) or link train failure scenarios
(previously forced via the force_link_training_failure entry). The entry
will autoreset after the link-retrain is complete.

v2: Add the entry from intel_dp_link_training.c (Jani)
v3: Lock connection_mutex only for the required intel_dp state. (Ville)

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240610164933.2947366-21-imre.deak@intel.com

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This commit is contained in:

Imre Deak 2024-06-10 19:49:32 +03:00

parent 0e0af7e052

commit 09f08c6ccc

3 changed files with 59 additions and 5 deletions

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1

drivers/gpu/drm/i915/display/intel_display_types.h

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18

drivers/gpu/drm/i915/display/intel_dp.c

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45

drivers/gpu/drm/i915/display/intel_dp_link_training.c

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