drm/i915: Use intel_panel_mode_valid() for DSI/LVDS/(s)DVO

All fixed mode panels should behave the same way when it comes to mode
filtering. Reuse the intel_panel_mode_valid() for all of them.

This changes the behaviour to match what we do for eDP, ie.
reject anything that doesn't exactly match the fixed mode
dimensions. Users can still manually provide different
sized modes which will be handled by the panel fitter just
as before. The difference is that we can no longer report
funny modes in the connector's mode list.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210923200109.4459-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -5,6 +5,7 @@
 
 #include <drm/drm_mipi_dsi.h>
 #include "intel_dsi.h"
+#include "intel_panel.h"
 
 int intel_dsi_bitrate(const struct intel_dsi *intel_dsi)
 {
@@ -67,10 +68,12 @@ enum drm_mode_status intel_dsi_mode_valid(struct drm_connector *connector,
 		return MODE_NO_DBLESCAN;
 
 	if (fixed_mode) {
-		if (mode->hdisplay > fixed_mode->hdisplay)
-			return MODE_PANEL;
-		if (mode->vdisplay > fixed_mode->vdisplay)
-			return MODE_PANEL;
+		enum drm_mode_status status;
+
+		status = intel_panel_mode_valid(intel_connector, mode);
+		if (status != MODE_OK)
+			return status;
+
 		if (fixed_mode->clock > max_dotclk)
 			return MODE_CLOCK_HIGH;
 	}

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

@@ -223,9 +223,10 @@ static enum drm_mode_status
 intel_dvo_mode_valid(struct drm_connector *connector,
 		     struct drm_display_mode *mode)
 {
-	struct intel_dvo *intel_dvo = intel_attached_dvo(to_intel_connector(connector));
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct intel_dvo *intel_dvo = intel_attached_dvo(intel_connector);
 	const struct drm_display_mode *fixed_mode =
-		to_intel_connector(connector)->panel.fixed_mode;
+		intel_connector->panel.fixed_mode;
 	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 	int target_clock = mode->clock;
 
@@ -235,10 +236,11 @@ intel_dvo_mode_valid(struct drm_connector *connector,
 	/* XXX: Validate clock range */
 
 	if (fixed_mode) {
-		if (mode->hdisplay > fixed_mode->hdisplay)
-			return MODE_PANEL;
-		if (mode->vdisplay > fixed_mode->vdisplay)
-			return MODE_PANEL;
+		enum drm_mode_status status;
+
+		status = intel_panel_mode_valid(intel_connector, mode);
+		if (status != MODE_OK)
+			return status;
 
 		target_clock = fixed_mode->clock;
 	}

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

@@ -389,13 +389,15 @@ intel_lvds_mode_valid(struct drm_connector *connector,
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 	int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
+	enum drm_mode_status status;
 
 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return MODE_NO_DBLESCAN;
-	if (mode->hdisplay > fixed_mode->hdisplay)
-		return MODE_PANEL;
-	if (mode->vdisplay > fixed_mode->vdisplay)
-		return MODE_PANEL;
+
+	status = intel_panel_mode_valid(intel_connector, mode);
+	if (status != MODE_OK)
+		return status;
+
 	if (fixed_mode->clock > max_pixclk)
 		return MODE_CLOCK_HIGH;
 

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

@@ -1873,7 +1873,6 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return MODE_NO_DBLESCAN;
 
-
 	if (clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
@@ -1890,14 +1889,11 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
 		return MODE_CLOCK_HIGH;
 
 	if (IS_LVDS(intel_sdvo_connector)) {
-		const struct drm_display_mode *fixed_mode =
-			intel_sdvo_connector->base.panel.fixed_mode;
-
-		if (mode->hdisplay > fixed_mode->hdisplay)
-			return MODE_PANEL;
+		enum drm_mode_status status;
 
-		if (mode->vdisplay > fixed_mode->vdisplay)
-			return MODE_PANEL;
+		status = intel_panel_mode_valid(&intel_sdvo_connector->base, mode);
+		if (status != MODE_OK)
+			return status;
 	}
 
 	return MODE_OK;