Commit f0fda0a4 authored by Zhao Yakui's avatar Zhao Yakui Committed by Dave Airlie
Browse files

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: default avatarZhao Yakui <>
Signed-off-by: default avatarDave Airlie <>
parent 559ee21d
......@@ -1215,3 +1215,49 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
return num_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)
mode = drm_mode_duplicate(dev, ptr);
if (mode) {
drm_mode_probed_add(connector, mode);
return num_modes;
......@@ -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__ */
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