drm/bridge: lontium-lt8912b: Validate mode in drm_bridge_funcs::mode_valid()

If the bridge is attached with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag set,
this driver won't initialize a connector and hence display mode won't be
validated in drm_connector_helper_funcs::mode_valid().  So, move the mode
validation from drm_connector_helper_funcs::mode_valid() to
drm_bridge_funcs::mode_valid(), because the mode validation is always done
for the bridge.

Fixes: 30e2ae94 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240813091637.1054586-1-victor.liu@nxp.com

drivers/gpu/drm/bridge/lontium-lt8912b.c

@@ -422,22 +422,6 @@ static const struct drm_connector_funcs lt8912_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
-static enum drm_mode_status
-lt8912_connector_mode_valid(struct drm_connector *connector,
-			    struct drm_display_mode *mode)
-{
-	if (mode->clock > 150000)
-		return MODE_CLOCK_HIGH;
-
-	if (mode->hdisplay > 1920)
-		return MODE_BAD_HVALUE;
-
-	if (mode->vdisplay > 1080)
-		return MODE_BAD_VVALUE;
-
-	return MODE_OK;
-}
-
 static int lt8912_connector_get_modes(struct drm_connector *connector)
 {
 	const struct drm_edid *drm_edid;
@@ -463,7 +447,6 @@ static int lt8912_connector_get_modes(struct drm_connector *connector)
 
 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
 	.get_modes = lt8912_connector_get_modes,
-	.mode_valid = lt8912_connector_mode_valid,
 };
 
 static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
@@ -605,6 +588,23 @@ static void lt8912_bridge_detach(struct drm_bridge *bridge)
 		drm_bridge_hpd_disable(lt->hdmi_port);
 }
 
+static enum drm_mode_status
+lt8912_bridge_mode_valid(struct drm_bridge *bridge,
+			 const struct drm_display_info *info,
+			 const struct drm_display_mode *mode)
+{
+	if (mode->clock > 150000)
+		return MODE_CLOCK_HIGH;
+
+	if (mode->hdisplay > 1920)
+		return MODE_BAD_HVALUE;
+
+	if (mode->vdisplay > 1080)
+		return MODE_BAD_VVALUE;
+
+	return MODE_OK;
+}
+
 static enum drm_connector_status
 lt8912_bridge_detect(struct drm_bridge *bridge)
 {
@@ -635,6 +635,7 @@ static const struct drm_edid *lt8912_bridge_edid_read(struct drm_bridge *bridge,
 static const struct drm_bridge_funcs lt8912_bridge_funcs = {
 	.attach = lt8912_bridge_attach,
 	.detach = lt8912_bridge_detach,
+	.mode_valid = lt8912_bridge_mode_valid,
 	.mode_set = lt8912_bridge_mode_set,
 	.enable = lt8912_bridge_enable,
 	.detect = lt8912_bridge_detect,