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 <yakui.zhao@intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 559ee21d

drivers/gpu/drm/drm_edid.c

+46 −0
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_crtc.h

+2 −0
Original line number Diff line number Diff line
@@ -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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