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

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

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ce02778b353b906c928268de9d7569d493a9be5d.1651569697.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2022-05-03 12:23:50 +03:00
parent 9d72b7e2d2
commit 94afc53826
1 changed files with 48 additions and 0 deletions
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48
drivers/gpu/drm/drm_edid.c
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@ -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
};