drm/i915/psr: Re-org Activate after enable

Let's move the activation calls together after enable is done.

No real functional change should be expected here. Just an attempt
to get it clear when we are really activating PSR after enabling it.

v2: Add braces on if/else because commit message there is too long
    as suggested by Jani.
v3: Rebased on top of commit d2419ffc10e4 ("drm/i915: Plumb
    crtc_state to PSR enable/disable")

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170907230041.22978-9-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/intel_psr.c

@@ -549,8 +549,6 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 
 		hsw_psr_enable_source(intel_dp, crtc_state);
 
-		if (INTEL_GEN(dev_priv) >= 9)
-			intel_psr_activate(intel_dp);
 	} else {
 		vlv_psr_setup_vsc(intel_dp, crtc_state);
 
@@ -560,20 +558,25 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 		vlv_psr_enable_source(intel_dp, crtc_state);
 	}
 
-	/*
-	 * FIXME: Activation should happen immediately since this function
-	 * is just called after pipe is fully trained and enabled.
-	 * However on every platform we face issues when first activation
-	 * follows a modeset so quickly.
-	 *     - On VLV/CHV we get bank screen on first activation
-	 *     - On HSW/BDW we get a recoverable frozen screen until next
-	 *       exit-activate sequence.
-	 */
-	if (INTEL_GEN(dev_priv) < 9)
+	dev_priv->psr.enabled = intel_dp;
+
+	if (INTEL_GEN(dev_priv) >= 9) {
+		intel_psr_activate(intel_dp);
+	} else {
+		/*
+		 * FIXME: Activation should happen immediately since this
+		 * function is just called after pipe is fully trained and
+		 * enabled.
+		 * However on some platforms we face issues when first
+		 * activation follows a modeset so quickly.
+		 *     - On VLV/CHV we get bank screen on first activation
+		 *     - On HSW/BDW we get a recoverable frozen screen until
+		 *       next exit-activate sequence.
+		 */
 		schedule_delayed_work(&dev_priv->psr.work,
 				      msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
+	}
 
-	dev_priv->psr.enabled = intel_dp;
 unlock:
 	mutex_unlock(&dev_priv->psr.lock);
 }