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drm/i915: Reinitialize sink scrambling/TMDS clock ratio on HPD

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The LG 4k TV I have doesn't deassert HPD when I turn the TV off, but
when I turn it back on it will pulse the HPD line. By that time it has
forgotten everything we told it about scrambling and the clock ratio.
Hence if we want to get a picture out if it again we have to tell it
whether we're currently sending scrambled data or not. Implement
that via the encoder->hotplug() hook.

v2: Force a full modeset to not follow the HDMI 2.0 spec more
    closely (Shashank)

[pushed with whitespace fixes to make sparse happy]
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180117192149.17760-1-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2018-01-17 21:21:46 +02:00
committed by Lyude Paul
parent 1b2cb026dc
commit dba14b27dd
6 changed files with 168 additions and 15 deletions
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1
drivers/gpu/drm/i915/intel_dp.c
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@@ -6393,6 +6393,7 @@ bool intel_dp_init(struct drm_i915_private *dev_priv,
"DP %c", port_name(port)))
goto err_encoder_init;
intel_encoder->hotplug = intel_encoder_hotplug;
intel_encoder->compute_config = intel_dp_compute_config;
intel_encoder->get_hw_state = intel_dp_get_hw_state;
intel_encoder->get_config = intel_dp_get_config;