drm/i915: Have pfit calculations return an error code

Change intel_{gmch,pch}_panel_fitting() to return a normal
error vs. success int. We'll need this later to validate that
the margin properties aren't misconfigured.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200422161917.17389-6-ville.syrjala@linux.intel.comReviewed-by: Manasi Navare <manasi.d.navare@intel.com>

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

@@ -1526,13 +1526,17 @@ static int gen11_dsi_compute_config(struct intel_encoder *encoder,
 						   base);
 	struct intel_connector *intel_connector = intel_dsi->attached_connector;
 	const struct drm_display_mode *fixed_mode =
-					intel_connector->panel.fixed_mode;
+		intel_connector->panel.fixed_mode;
 	struct drm_display_mode *adjusted_mode =
-					&pipe_config->hw.adjusted_mode;
+		&pipe_config->hw.adjusted_mode;
+	int ret;
 
 	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 	intel_fixed_panel_mode(fixed_mode, adjusted_mode);
-	intel_pch_panel_fitting(pipe_config, conn_state);
+
+	ret = intel_pch_panel_fitting(pipe_config, conn_state);
+	if (ret)
+		return ret;
 
 	adjusted_mode->flags = 0;
 

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

@@ -2354,9 +2354,7 @@ intel_dp_ycbcr420_config(struct intel_dp *intel_dp,
 
 	crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
 
-	intel_pch_panel_fitting(crtc_state, conn_state);
-
-	return 0;
+	return intel_pch_panel_fitting(crtc_state, conn_state);
 }
 
 bool intel_dp_limited_color_range(const struct intel_crtc_state *crtc_state,
@@ -2568,9 +2566,11 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 				       adjusted_mode);
 
 		if (HAS_GMCH(dev_priv))
-			intel_gmch_panel_fitting(pipe_config, conn_state);
+			ret = intel_gmch_panel_fitting(pipe_config, conn_state);
 		else
-			intel_pch_panel_fitting(pipe_config, conn_state);
+			ret = intel_pch_panel_fitting(pipe_config, conn_state);
+		if (ret)
+			return ret;
 	}
 
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)

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

@@ -2321,24 +2321,27 @@ static bool hdmi_deep_color_possible(const struct intel_crtc_state *crtc_state,
 	return true;
 }
 
-static bool
+static int
 intel_hdmi_ycbcr420_config(struct intel_crtc_state *crtc_state,
 			   const struct drm_connector_state *conn_state)
 {
 	struct drm_connector *connector = conn_state->connector;
 	struct drm_i915_private *i915 = to_i915(connector->dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+
+	if (!drm_mode_is_420_only(&connector->display_info, adjusted_mode))
+		return 0;
 
 	if (!connector->ycbcr_420_allowed) {
 		drm_err(&i915->drm,
 			"Platform doesn't support YCBCR420 output\n");
-		return false;
+		return -EINVAL;
 	}
 
 	crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
 
-	intel_pch_panel_fitting(crtc_state, conn_state);
-
-	return true;
+	return intel_pch_panel_fitting(crtc_state, conn_state);
 }
 
 static int intel_hdmi_port_clock(int clock, int bpc)
@@ -2466,13 +2469,9 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
 		pipe_config->pixel_multiplier = 2;
 
-	if (drm_mode_is_420_only(&connector->display_info, adjusted_mode)) {
-		if (!intel_hdmi_ycbcr420_config(pipe_config, conn_state)) {
-			drm_err(&dev_priv->drm,
-				"Can't support YCBCR420 output\n");
-			return -EINVAL;
-		}
-	}
+	ret = intel_hdmi_ycbcr420_config(pipe_config, conn_state);
+	if (ret)
+		return ret;
 
 	pipe_config->limited_color_range =
 		intel_hdmi_limited_color_range(pipe_config, conn_state);

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

@@ -403,6 +403,7 @@ static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 	struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 	struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
 	unsigned int lvds_bpp;
+	int ret;
 
 	/* Should never happen!! */
 	if (INTEL_GEN(dev_priv) < 4 && intel_crtc->pipe == 0) {
@@ -436,13 +437,15 @@ static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return -EINVAL;
 
-	if (HAS_PCH_SPLIT(dev_priv)) {
+	if (HAS_PCH_SPLIT(dev_priv))
 		pipe_config->has_pch_encoder = true;
 
-		intel_pch_panel_fitting(pipe_config, conn_state);
-	} else {
-		intel_gmch_panel_fitting(pipe_config, conn_state);
-	}
+	if (HAS_GMCH(dev_priv))
+		ret = intel_gmch_panel_fitting(pipe_config, conn_state);
+	else
+		ret = intel_pch_panel_fitting(pipe_config, conn_state);
+	if (ret)
+		return ret;
 
 	/*
 	 * XXX: It would be nice to support lower refresh rates on the

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

@@ -176,9 +176,8 @@ intel_panel_vbt_fixed_mode(struct intel_connector *connector)
 }
 
 /* adjusted_mode has been preset to be the panel's fixed mode */
-void
-intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
-			const struct drm_connector_state *conn_state)
+int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
+			    const struct drm_connector_state *conn_state)
 {
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
@@ -188,7 +187,7 @@ intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
 	if (adjusted_mode->crtc_hdisplay == crtc_state->pipe_src_w &&
 	    adjusted_mode->crtc_vdisplay == crtc_state->pipe_src_h &&
 	    crtc_state->output_format != INTEL_OUTPUT_FORMAT_YCBCR420)
-		return;
+		return 0;
 
 	switch (conn_state->scaling_mode) {
 	case DRM_MODE_SCALE_CENTER:
@@ -239,12 +238,14 @@ intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
 
 	default:
 		MISSING_CASE(conn_state->scaling_mode);
-		return;
+		return -EINVAL;
 	}
 
 	drm_rect_init(&crtc_state->pch_pfit.dst,
 		      x, y, width, height);
 	crtc_state->pch_pfit.enabled = true;
+
+	return 0;
 }
 
 static void
@@ -381,8 +382,8 @@ static void i9xx_scale_aspect(struct intel_crtc_state *crtc_state,
 	}
 }
 
-void intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
-			      const struct drm_connector_state *conn_state)
+int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
+			     const struct drm_connector_state *conn_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -431,7 +432,7 @@ void intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
 		break;
 	default:
 		MISSING_CASE(conn_state->scaling_mode);
-		return;
+		return -EINVAL;
 	}
 
 	/* 965+ wants fuzzy fitting */
@@ -452,6 +453,8 @@ void intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
 	crtc_state->gmch_pfit.control = pfit_control;
 	crtc_state->gmch_pfit.pgm_ratios = pfit_pgm_ratios;
 	crtc_state->gmch_pfit.lvds_border_bits = border;
+
+	return 0;
 }
 
 /**

drivers/gpu/drm/i915/display/intel_panel.h

@@ -25,10 +25,10 @@ int intel_panel_init(struct intel_panel *panel,
 void intel_panel_fini(struct intel_panel *panel);
 void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
 			    struct drm_display_mode *adjusted_mode);
-void intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
+int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
+			    const struct drm_connector_state *conn_state);
+int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state);
-void intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
-			      const struct drm_connector_state *conn_state);
 void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
 				    u32 level, u32 max);
 int intel_panel_setup_backlight(struct drm_connector *connector,

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

@@ -278,9 +278,11 @@ static int intel_dsi_compute_config(struct intel_encoder *encoder,
 		intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 
 		if (HAS_GMCH(dev_priv))
-			intel_gmch_panel_fitting(pipe_config, conn_state);
+			ret = intel_gmch_panel_fitting(pipe_config, conn_state);
 		else
-			intel_pch_panel_fitting(pipe_config, conn_state);
+			ret = intel_pch_panel_fitting(pipe_config, conn_state);
+		if (ret)
+			return ret;
 	}
 
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)