drm/i915: clean up the cpu edp pll special case

By using the new pre_enable/post_disable functions.

To ensure that we only frob the cpu edp pll while the pipe is off add
the relevant asserts. Thanks to the new output state staging, this is
now really easy.

With this fixed we can now finally rip out the special-case handling
in the dp dpms code and replace it by the common intel_connector_dpms.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -808,9 +808,6 @@ intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 	}
 }
 
-static void ironlake_edp_pll_on(struct drm_encoder *encoder);
-static void ironlake_edp_pll_off(struct drm_encoder *encoder);
-
 static void
 intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 		  struct drm_display_mode *adjusted_mode)
@@ -821,14 +818,6 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 	struct drm_crtc *crtc = intel_dp->base.base.crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-	/* Turn on the eDP PLL if needed */
-	if (is_edp(intel_dp)) {
-		if (!is_pch_edp(intel_dp))
-			ironlake_edp_pll_on(encoder);
-		else
-			ironlake_edp_pll_off(encoder);
-	}
-
 	/*
 	 * There are four kinds of DP registers:
 	 *
@@ -1191,12 +1180,16 @@ static void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
 	msleep(intel_dp->backlight_off_delay);
 }
 
-static void ironlake_edp_pll_on(struct drm_encoder *encoder)
+static void ironlake_edp_pll_on(struct intel_dp *intel_dp)
 {
-	struct drm_device *dev = encoder->dev;
+	struct drm_device *dev = intel_dp->base.base.dev;
+	struct drm_crtc *crtc = intel_dp->base.base.crtc;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 dpa_ctl;
 
+	assert_pipe_disabled(dev_priv,
+			     to_intel_crtc(crtc)->pipe);
+
 	DRM_DEBUG_KMS("\n");
 	dpa_ctl = I915_READ(DP_A);
 	dpa_ctl |= DP_PLL_ENABLE;
@@ -1205,12 +1198,16 @@ static void ironlake_edp_pll_on(struct drm_encoder *encoder)
 	udelay(200);
 }
 
-static void ironlake_edp_pll_off(struct drm_encoder *encoder)
+static void ironlake_edp_pll_off(struct intel_dp *intel_dp)
 {
-	struct drm_device *dev = encoder->dev;
+	struct drm_device *dev = intel_dp->base.base.dev;
+	struct drm_crtc *crtc = intel_dp->base.base.crtc;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 dpa_ctl;
 
+	assert_pipe_disabled(dev_priv,
+			     to_intel_crtc(crtc)->pipe);
+
 	dpa_ctl = I915_READ(DP_A);
 	dpa_ctl &= ~DP_PLL_ENABLE;
 	I915_WRITE(DP_A, dpa_ctl);
@@ -1309,6 +1306,14 @@ static void intel_disable_dp(struct intel_encoder *encoder)
 	intel_dp_link_down(intel_dp);
 }
 
+static void intel_post_disable_dp(struct intel_encoder *encoder)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	if (is_cpu_edp(intel_dp))
+		ironlake_edp_pll_off(intel_dp);
+}
+
 static void intel_enable_dp(struct intel_encoder *encoder)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
@@ -1328,39 +1333,12 @@ static void intel_enable_dp(struct intel_encoder *encoder)
 	ironlake_edp_backlight_on(intel_dp);
 }
 
-static void
-intel_dp_dpms(struct drm_connector *connector, int mode)
+static void intel_pre_enable_dp(struct intel_encoder *encoder)
 {
-	struct intel_dp *intel_dp = intel_attached_dp(connector);
-
-	/* DP supports only 2 dpms states. */
-	if (mode != DRM_MODE_DPMS_ON)
-		mode = DRM_MODE_DPMS_OFF;
-
-	if (mode == connector->dpms)
-		return;
-
-	connector->dpms = mode;
-
-	/* Only need to change hw state when actually enabled */
-	if (!intel_dp->base.base.crtc) {
-		intel_dp->base.connectors_active = false;
-		return;
-	}
-
-	if (mode != DRM_MODE_DPMS_ON) {
-		intel_encoder_dpms(&intel_dp->base, mode);
-
-		if (is_cpu_edp(intel_dp))
-			ironlake_edp_pll_off(&intel_dp->base.base);
-	} else {
-		if (is_cpu_edp(intel_dp))
-			ironlake_edp_pll_on(&intel_dp->base.base);
-
-		intel_encoder_dpms(&intel_dp->base, mode);
-	}
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
 
-	intel_modeset_check_state(connector->dev);
+	if (is_cpu_edp(intel_dp))
+		ironlake_edp_pll_on(intel_dp);
 }
 
 /*
@@ -2378,7 +2356,7 @@ static const struct drm_encoder_helper_funcs intel_dp_helper_funcs = {
 };
 
 static const struct drm_connector_funcs intel_dp_connector_funcs = {
-	.dpms = intel_dp_dpms,
+	.dpms = intel_connector_dpms,
 	.detect = intel_dp_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.set_property = intel_dp_set_property,
@@ -2509,7 +2487,9 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 	drm_sysfs_connector_add(connector);
 
 	intel_encoder->enable = intel_enable_dp;
+	intel_encoder->pre_enable = intel_pre_enable_dp;
 	intel_encoder->disable = intel_disable_dp;
+	intel_encoder->post_disable = intel_post_disable_dp;
 	intel_encoder->get_hw_state = intel_dp_get_hw_state;
 	intel_connector->get_hw_state = intel_connector_get_hw_state;