drm/i915/hsw, bdw: Split power well set to enable/disable helpers

We can reduce the code indentation by splitting the set helper to
separate enable/disable helpers. This also allows us to unify the
HSW/BDW and GEN9+ power well ops in follow-up patches, which introduces
some differences between the enable and disable helpers.

While at it also remove the redundant enable/disable debug messages,
the same info is printed already elsewhere.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1499352040-8819-12-git-send-email-imre.deak@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -396,30 +396,26 @@ static void gen9_wait_for_power_well_disable(struct drm_i915_private *dev_priv,
 		      !!(reqs & 1), !!(reqs & 2), !!(reqs & 4), !!(reqs & 8));
 }
 
-static void hsw_set_power_well(struct drm_i915_private *dev_priv,
-			       struct i915_power_well *power_well, bool enable)
+static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
+				  struct i915_power_well *power_well)
 {
-	uint32_t tmp;
+	I915_WRITE(HSW_PWR_WELL_DRIVER, HSW_PWR_WELL_ENABLE_REQUEST);
 
-	tmp = I915_READ(HSW_PWR_WELL_DRIVER);
-
-	if (enable) {
-		I915_WRITE(HSW_PWR_WELL_DRIVER, HSW_PWR_WELL_ENABLE_REQUEST);
+	if (intel_wait_for_register(dev_priv,
+				    HSW_PWR_WELL_DRIVER,
+				    HSW_PWR_WELL_STATE_ENABLED,
+				    HSW_PWR_WELL_STATE_ENABLED,
+				    20))
+		DRM_ERROR("Timeout enabling power well\n");
+	hsw_power_well_post_enable(dev_priv);
+}
 
-		DRM_DEBUG_KMS("Enabling power well\n");
-		if (intel_wait_for_register(dev_priv,
-					    HSW_PWR_WELL_DRIVER,
-					    HSW_PWR_WELL_STATE_ENABLED,
-					    HSW_PWR_WELL_STATE_ENABLED,
-					    20))
-			DRM_ERROR("Timeout enabling power well\n");
-		hsw_power_well_post_enable(dev_priv);
-	} else {
-		hsw_power_well_pre_disable(dev_priv);
-		I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
-		POSTING_READ(HSW_PWR_WELL_DRIVER);
-		DRM_DEBUG_KMS("Requesting to disable the power well\n");
-	}
+static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
+				   struct i915_power_well *power_well)
+{
+	hsw_power_well_pre_disable(dev_priv);
+	I915_WRITE(HSW_PWR_WELL_DRIVER, 0);
+	POSTING_READ(HSW_PWR_WELL_DRIVER);
 }
 
 #define SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS (		\
@@ -889,18 +885,6 @@ static void hsw_power_well_sync_hw(struct drm_i915_private *dev_priv,
 	}
 }
 
-static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
-				  struct i915_power_well *power_well)
-{
-	hsw_set_power_well(dev_priv, power_well, true);
-}
-
-static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
-				   struct i915_power_well *power_well)
-{
-	hsw_set_power_well(dev_priv, power_well, false);
-}
-
 static bool skl_power_well_enabled(struct drm_i915_private *dev_priv,
 					struct i915_power_well *power_well)
 {