drm/i915: Add a note explaining vdd on/off handling in intel_dp_aux_ch()
Add a comment to explain why we care about the current want_panel_vdd state in intel_dp_aux_ch(). Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -533,6 +533,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
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bool has_aux_irq = HAS_AUX_IRQ(dev);
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bool vdd;
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/*
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* We will be called with VDD already enabled for dpcd/edid/oui reads.
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* In such cases we want to leave VDD enabled and it's up to upper layers
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* to turn it off. But for eg. i2c-dev access we need to turn it on/off
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* ourselves.
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*/
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vdd = edp_panel_vdd_on(intel_dp);
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/* dp aux is extremely sensitive to irq latency, hence request the
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