Commit 94afc538 authored by Jani Nikula's avatar Jani Nikula
Browse files

drm/edid: add iterator for EDID base and extension blocks 



Add an iterator abstraction for going through all the EDID blocks.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ce02778b353b906c928268de9d7569d493a9be5d.1651569697.git.jani.nikula@intel.com
parent 9d72b7e2

drivers/gpu/drm/drm_edid.c

+48 −0
Original line number Diff line number Diff line
@@ -1599,6 +1599,54 @@ static const void *edid_extension_block_data(const struct edid *edid, int index) 
	return edid_block_data(edid, index + 1);

}



/*

 * EDID base and extension block iterator.

 *

 * struct drm_edid_iter iter;

 * const u8 *block;

 *

 * drm_edid_iter_begin(edid, &iter);

 * drm_edid_iter_for_each(block, &iter) {

 *         // do stuff with block

 * }

 * drm_edid_iter_end(&iter);

 */

struct drm_edid_iter {

	const struct edid *edid;



	/* Current block index. */

	int index;

};



static void drm_edid_iter_begin(const struct edid *edid,

				struct drm_edid_iter *iter)

{

	memset(iter, 0, sizeof(*iter));



	iter->edid = edid;

}



static const void *__drm_edid_iter_next(struct drm_edid_iter *iter)

{

	const void *block = NULL;



	if (!iter->edid)

		return NULL;



	if (iter->index < edid_block_count(iter->edid))

		block = edid_block_data(iter->edid, iter->index++);



	return block;

}



#define drm_edid_iter_for_each(__block, __iter)			\

	while (((__block) = __drm_edid_iter_next(__iter)))



static void drm_edid_iter_end(struct drm_edid_iter *iter)

{

	memset(iter, 0, sizeof(*iter));

}



static const u8 edid_header[] = {

	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00

};