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>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 190e617..a45069b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -533,6 +533,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
        bool has_aux_irq = HAS_AUX_IRQ(dev);
        bool vdd;
 
+       /*
+        * We will be called with VDD already enabled for dpcd/edid/oui reads.
+        * In such cases we want to leave VDD enabled and it's up to upper layers
+        * to turn it off. But for eg. i2c-dev access we need to turn it on/off
+        * ourselves.
+        */
        vdd = edp_panel_vdd_on(intel_dp);
 
        /* dp aux is extremely sensitive to irq latency, hence request the