This patchset fixes a problem during Display Port link training, where
the link training is interrupted by a short HPD pulse generated by the
sink. Generally the sink signals a bad link state via such short pulses,
but the sink should prevent such signaling during link training.
Some sinks do generate a short pulse as above during link training, or a
pulse generated before the link training started may be handled from a
scheduled work during link training. Such a handling may interfere with
the link training (see patch 3 for the reason), so this patchset
prevents the handling of pulses during link training.
Imre Deak (5):
drm/i915/hpd: Let an HPD pin be in the disabled state when handling
missed IRQs
drm/i915/hpd: Add support for suspending the IRQ handling on an HPD
pin
drm/i915/dp: Fix link training interrupted by a short HPD pulse
drm/i915/dp: Queue a link check after link training is complete
drm/i915/crt: Use intel_hpd_suspend/resume() instead of
intel_hpd_disable/enable()
drivers/gpu/drm/i915/display/intel_crt.c | 7 +-
.../gpu/drm/i915/display/intel_display_core.h | 2 +
.../drm/i915/display/intel_dp_link_training.c | 23 +-
drivers/gpu/drm/i915/display/intel_hotplug.c | 264 ++++++++++++++----
drivers/gpu/drm/i915/display/intel_hotplug.h | 5 +-
5 files changed, 237 insertions(+), 64 deletions(-)
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2.44.2
