[Intel-gfx] [RFC 19/19] drm/edid: sunset drm_find_cea_extension()

[Jani Nikula]

Convert drm_find_cea_extension() to a predicate function to check if the
EDID has a CEA extension or a DisplayID CTA data block. This is mainly
to avoid adding new users that only find the first CEA extension.

Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index dfaa21f00941..84314b65b75b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3422,30 +3422,29 @@ const u8 *drm_find_edid_extension(const struct edid 
*edid,
        return edid_ext;
 }
 
-static const u8 *drm_find_cea_extension(const struct edid *edid)
+/* Return true if the EDID has a CEA extension or a DisplayID CTA data block */
+static bool drm_edid_has_cea_extension(const struct edid *edid)
 {
        const struct displayid_block *block;
        struct displayid_iter iter;
-       const u8 *cea;
        int ext_index = 0;
+       bool found = false;
 
        /* Look for a top level CEA extension block */
-       /* FIXME: make callers iterate through multiple CEA ext blocks? */
-       cea = drm_find_edid_extension(edid, CEA_EXT, &ext_index);
-       if (cea)
-               return cea;
+       if (drm_find_edid_extension(edid, CEA_EXT, &ext_index))
+               return true;
 
        /* CEA blocks can also be found embedded in a DisplayID block */
        displayid_iter_edid_begin(edid, &iter);
        displayid_iter_for_each(block, &iter) {
                if (block->tag == DATA_BLOCK_CTA) {
-                       cea = (const u8 *)block;
+                       found = true;
                        break;
                }
        }
        displayid_iter_end(&iter);
 
-       return cea;
+       return found;
 }
 
 static __always_inline const struct drm_display_mode *cea_mode_for_vic(u8 vic)
@@ -3715,7 +3714,7 @@ add_alternate_cea_modes(struct drm_connector *connector, 
struct edid *edid)
        int modes = 0;
 
        /* Don't add CEA modes if the CEA extension block is missing */
-       if (!drm_find_cea_extension(edid))
+       if (!drm_edid_has_cea_extension(edid))
                return 0;
 
        /*
-- 
2.30.2