drm/i915: Remove the unneeded AUX power ref from intel_dp_hpd_pulse()

The power get/put was added in

commit 1c767b33 ("drm/i915: take display port power domain in DP HPD handler")
Author: Imre Deak <imre.deak@intel.com>
Date:   Mon Aug 18 14:42:42 2014 +0300

to account for the HW access in ibx_digital_port_connected(). This
latter call was in turn removed in

commit 7d23e3c3 ("drm/i915: Cleaning up intel_dp_hpd_pulse")
Author: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Date:   Wed Mar 30 18:05:23 2016 +0530

after which we didn't actually need the power reference.

One way we are accessing the HW during HPD pulse handling is via DP AUX
transfers, but the transfer function takes its own reference, so doesn't
need the reference in intel_dp_hpd_pulse().

The other spot is in

	intel_psr_short_pulse()->intel_psr_disable_locked()

but that can only happen when the panel is enabled with the
corresponding modeset already holding the required power reference.

v2:
- Remove the unneeded power get/put from intel_psr_disable_locked().
  (Ville)
- Checkpatch commit quoting format fix in the commit log.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190509173446.31095-9-imre.deak@intel.com

drivers/gpu/drm/i915/intel_dp.c

@@ -6302,9 +6302,6 @@ enum irqreturn
 intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 {
 	struct intel_dp *intel_dp = &intel_dig_port->dp;
-	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	enum irqreturn ret = IRQ_NONE;
-	intel_wakeref_t wakeref;
 
 	if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) {
 		/*
@@ -6327,9 +6324,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 		return IRQ_NONE;
 	}
 
-	wakeref = intel_display_power_get(dev_priv,
-					  intel_aux_power_domain(intel_dig_port));
-
 	if (intel_dp->is_mst) {
 		if (intel_dp_check_mst_status(intel_dp) == -EINVAL) {
 			/*
@@ -6341,7 +6335,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 			intel_dp->is_mst = false;
 			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
 							intel_dp->is_mst);
-			goto put_power;
+
+			return IRQ_NONE;
 		}
 	}
 
@@ -6351,17 +6346,10 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 		handled = intel_dp_short_pulse(intel_dp);
 
 		if (!handled)
-			goto put_power;
+			return IRQ_NONE;
 	}
 
-	ret = IRQ_HANDLED;
-
-put_power:
-	intel_display_power_put(dev_priv,
-				intel_aux_power_domain(intel_dig_port),
-				wakeref);
-
-	return ret;
+	return IRQ_HANDLED;
 }
 
 /* check the VBT to see whether the eDP is on another port */