drm/i915: Call intel_update_watermarks() in specific place during modeset

Make the call to intel_update_watermarks() just once or twice during
modeset. Ideally it should happen independently when each plane gets
enabled/disabled, but for now it seems better to keep it in central
place. We can improve things when we get all the planes sorted out
in a better way.

When enabling set up the watermarks just before the pipe is enabled.
And when disabling we need to wait until we've marked the crtc as
inactive, as otherwise intel_crtc_active() would still think the pipe
is enabled and the computed watermarks would reflect that.

v2: Pimp up the commit message a bit
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -3262,8 +3262,6 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 	intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);
 	intel_set_pch_fifo_underrun_reporting(dev, pipe, true);
 
-	intel_update_watermarks(crtc);
-
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->pre_enable)
 			encoder->pre_enable(encoder);
@@ -3286,6 +3284,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 	 */
 	intel_crtc_load_lut(crtc);
 
+	intel_update_watermarks(crtc);
 	intel_enable_pipe(dev_priv, pipe,
 			  intel_crtc->config.has_pch_encoder, false);
 	intel_enable_plane(dev_priv, plane, pipe);
@@ -3372,8 +3371,6 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
 	if (intel_crtc->config.has_pch_encoder)
 		intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, true);
 
-	intel_update_watermarks(crtc);
-
 	if (intel_crtc->config.has_pch_encoder)
 		dev_priv->display.fdi_link_train(crtc);
 
@@ -3394,6 +3391,7 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
 	intel_ddi_set_pipe_settings(crtc);
 	intel_ddi_enable_transcoder_func(crtc);
 
+	intel_update_watermarks(crtc);
 	intel_enable_pipe(dev_priv, pipe,
 			  intel_crtc->config.has_pch_encoder, false);
 	intel_enable_plane(dev_priv, plane, pipe);
@@ -3665,7 +3663,6 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 		return;
 
 	intel_crtc->active = true;
-	intel_update_watermarks(crtc);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->pre_pll_enable)
@@ -3684,6 +3681,7 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 
 	intel_crtc_load_lut(crtc);
 
+	intel_update_watermarks(crtc);
 	intel_enable_pipe(dev_priv, pipe, false, is_dsi);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
@@ -3710,7 +3708,6 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 		return;
 
 	intel_crtc->active = true;
-	intel_update_watermarks(crtc);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->pre_enable)
@@ -3722,6 +3719,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 
 	intel_crtc_load_lut(crtc);
 
+	intel_update_watermarks(crtc);
 	intel_enable_pipe(dev_priv, pipe, false, false);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
@@ -3793,8 +3791,9 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 		i9xx_disable_pll(dev_priv, pipe);
 
 	intel_crtc->active = false;
-	intel_update_fbc(dev);
 	intel_update_watermarks(crtc);
+
+	intel_update_fbc(dev);
 }
 
 static void i9xx_crtc_off(struct drm_crtc *crtc)
@@ -4955,8 +4954,6 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 
 	ret = intel_pipe_set_base(crtc, x, y, fb);
 
-	intel_update_watermarks(crtc);
-
 	return ret;
 }
 
@@ -5843,8 +5840,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
 
 	ret = intel_pipe_set_base(crtc, x, y, fb);
 
-	intel_update_watermarks(crtc);
-
 	return ret;
 }
 
@@ -6299,8 +6294,6 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc,
 
 	ret = intel_pipe_set_base(crtc, x, y, fb);
 
-	intel_update_watermarks(crtc);
-
 	return ret;
 }