drm/kms: add a function that can add the mode for the output device without EDID
Add a function that can be used to add the default mode for the output device
without EDID.
It will add the default mode that meets with the requirements of given
hdisplay/vdisplay limit.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f84a98f..e2d5f51 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1215,3 +1215,49 @@
return num_modes;
}
EXPORT_SYMBOL(drm_add_edid_modes);
+
+/**
+ * drm_add_modes_noedid - add modes for the connectors without EDID
+ * @connector: connector we're probing
+ * @hdisplay: the horizontal display limit
+ * @vdisplay: the vertical display limit
+ *
+ * Add the specified modes to the connector's mode list. Only when the
+ * hdisplay/vdisplay is not beyond the given limit, it will be added.
+ *
+ * Return number of modes added or 0 if we couldn't find any.
+ */
+int drm_add_modes_noedid(struct drm_connector *connector,
+ int hdisplay, int vdisplay)
+{
+ int i, count, num_modes = 0;
+ struct drm_display_mode *mode, *ptr;
+ struct drm_device *dev = connector->dev;
+
+ count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
+ if (hdisplay < 0)
+ hdisplay = 0;
+ if (vdisplay < 0)
+ vdisplay = 0;
+
+ for (i = 0; i < count; i++) {
+ ptr = &drm_dmt_modes[i];
+ if (hdisplay && vdisplay) {
+ /*
+ * Only when two are valid, they will be used to check
+ * whether the mode should be added to the mode list of
+ * the connector.
+ */
+ if (ptr->hdisplay > hdisplay ||
+ ptr->vdisplay > vdisplay)
+ continue;
+ }
+ mode = drm_mode_duplicate(dev, ptr);
+ if (mode) {
+ drm_mode_probed_add(connector, mode);
+ num_modes++;
+ }
+ }
+ return num_modes;
+}
+EXPORT_SYMBOL(drm_add_modes_noedid);