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>
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@ -1215,3 +1215,49 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
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return num_modes;
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}
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EXPORT_SYMBOL(drm_add_edid_modes);
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/**
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* drm_add_modes_noedid - add modes for the connectors without EDID
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* @connector: connector we're probing
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* @hdisplay: the horizontal display limit
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* @vdisplay: the vertical display limit
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*
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* Add the specified modes to the connector's mode list. Only when the
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* hdisplay/vdisplay is not beyond the given limit, it will be added.
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*
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* Return number of modes added or 0 if we couldn't find any.
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*/
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int drm_add_modes_noedid(struct drm_connector *connector,
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int hdisplay, int vdisplay)
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{
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int i, count, num_modes = 0;
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struct drm_display_mode *mode, *ptr;
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struct drm_device *dev = connector->dev;
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count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
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if (hdisplay < 0)
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hdisplay = 0;
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if (vdisplay < 0)
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vdisplay = 0;
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for (i = 0; i < count; i++) {
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ptr = &drm_dmt_modes[i];
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if (hdisplay && vdisplay) {
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/*
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* Only when two are valid, they will be used to check
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* whether the mode should be added to the mode list of
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* the connector.
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*/
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if (ptr->hdisplay > hdisplay ||
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ptr->vdisplay > vdisplay)
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continue;
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}
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mode = drm_mode_duplicate(dev, ptr);
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if (mode) {
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drm_mode_probed_add(connector, mode);
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num_modes++;
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}
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}
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return num_modes;
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}
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EXPORT_SYMBOL(drm_add_modes_noedid);
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@ -750,4 +750,6 @@ extern struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
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extern struct drm_display_mode *drm_gtf_mode(struct drm_device *dev,
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int hdisplay, int vdisplay, int vrefresh,
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bool interlaced, int margins);
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extern int drm_add_modes_noedid(struct drm_connector *connector,
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int hdisplay, int vdisplay);
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#endif /* __DRM_CRTC_H__ */
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