drm/i915: Move the DPLL extra power domain handling up one level

The extra DPLL power domain is currently handled in three places:
- combo_pll_enable()
- combo_pll_disable()
- readout_dpll_hw_state()

First two of those are low level PLL funcs, but the third is a higher
level thing. So the current situation is rather inconsistent. Unify
this by moving the PLL enable/disable up one level. This also means
the extra power domain could be trivially be used by other platforms
as well.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231012123522.26045-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_dpll_mgr.c

@@ -258,6 +258,10 @@ void intel_enable_shared_dpll(const struct intel_crtc_state *crtc_state)
 	drm_WARN_ON(&i915->drm, pll->on);
 
 	drm_dbg_kms(&i915->drm, "enabling %s\n", pll->info->name);
+
+	if (pll->info->power_domain)
+		pll->wakeref = intel_display_power_get(i915, pll->info->power_domain);
+
 	pll->info->funcs->enable(i915, pll);
 	pll->on = true;
 
@@ -307,6 +311,9 @@ void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
 	pll->info->funcs->disable(i915, pll);
 	pll->on = false;
 
+	if (pll->info->power_domain)
+		intel_display_power_put(i915, pll->info->power_domain, pll->wakeref);
+
 out:
 	mutex_unlock(&i915->display.dpll.lock);
 }
@@ -3838,9 +3845,6 @@ static void combo_pll_enable(struct drm_i915_private *i915,
 {
 	i915_reg_t enable_reg = intel_combo_pll_enable_reg(i915, pll);
 
-	if (pll->info->power_domain)
-		pll->wakeref = intel_display_power_get(i915, pll->info->power_domain);
-
 	icl_pll_power_enable(i915, pll, enable_reg);
 
 	icl_dpll_write(i915, pll);
@@ -3936,9 +3940,6 @@ static void combo_pll_disable(struct drm_i915_private *i915,
 	i915_reg_t enable_reg = intel_combo_pll_enable_reg(i915, pll);
 
 	icl_pll_disable(i915, pll, enable_reg);
-
-	if (pll->info->power_domain)
-		intel_display_power_put(i915, pll->info->power_domain, pll->wakeref);
 }
 
 static void tbt_pll_disable(struct drm_i915_private *i915,
@@ -4409,6 +4410,9 @@ static void sanitize_dpll_state(struct drm_i915_private *i915,
 
 	pll->info->funcs->disable(i915, pll);
 	pll->on = false;
+
+	if (pll->info->power_domain)
+		intel_display_power_put(i915, pll->info->power_domain, pll->wakeref);
 }
 
 void intel_dpll_sanitize_state(struct drm_i915_private *i915)