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>

2 files changed, 48 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f84a98f2e373..e2d5f515f7b2 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1215,3 +1215,49 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
         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);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index b0427a70fcbd..ae1e9e166959 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -750,4 +750,6 @@ extern struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
 extern struct drm_display_mode *drm_gtf_mode(struct drm_device *dev,
                                 int hdisplay, int vdisplay, int vrefresh,
                                 bool interlaced, int margins);
+extern int drm_add_modes_noedid(struct drm_connector *connector,
+                                int hdisplay, int vdisplay);
 #endif /* __DRM_CRTC_H__ */