some platform may not support all the display mode,
add mode_valid interface check it

Signed-off-by: Andy Yan <andy....@rock-chips.com>

---

Changes in v18: None
Changes in v17: None
Changes in v16: None
Changes in v15: None
Changes in v14:
- remove drm_connector_register, because imx-drm core has registered
connector

Changes in v13: None
Changes in v12: None
Changes in v11: None
Changes in v10: None
Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

 drivers/gpu/drm/bridge/dw_hdmi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index d49861c..d5bec0c 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -1405,6 +1405,20 @@ static int dw_hdmi_connector_get_modes(struct 
drm_connector *connector)
        return 0;
 }
 
+static enum drm_mode_status
+dw_hdmi_connector_mode_valid(struct drm_connector *connector,
+                            struct drm_display_mode *mode)
+{
+       struct dw_hdmi *hdmi = container_of(connector,
+                                          struct dw_hdmi, connector);
+       enum drm_mode_status mode_status = MODE_OK;
+
+       if (hdmi->plat_data->mode_valid)
+               mode_status = hdmi->plat_data->mode_valid(connector, mode);
+
+       return mode_status;
+}
+
 static struct drm_encoder *dw_hdmi_connector_best_encoder(struct drm_connector
                                                           *connector)
 {
@@ -1429,6 +1443,7 @@ static struct drm_connector_funcs dw_hdmi_connector_funcs 
= {
 
 static struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs = {
        .get_modes = dw_hdmi_connector_get_modes,
+       .mode_valid = dw_hdmi_connector_mode_valid,
        .best_encoder = dw_hdmi_connector_best_encoder,
 };
 
-- 
1.9.1


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