Support to read HF_EEODB block that request by HDMI 2.1 specification.
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Signed-off-by: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
---
drivers/gpu/drm/drm_connector.c | 5 ++-
drivers/gpu/drm/drm_edid.c | 76 ++++++++++++++++++++++++++++++---
include/drm/drm_edid.h | 2 +
3 files changed, 77 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index a50c82bc2b2f..0f9e3ef00be7 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -2137,8 +2137,11 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
if (connector->override_edid)
return 0;
- if (edid)
+ if (edid) {
size = EDID_LENGTH * (1 + edid->extensions);
+ if (drm_edid_is_hf_eeodb_blk_available(edid))
+ size = EDID_LENGTH * (1 + drm_edid_read_hf_eeodb_blk_size(edid));
+ }
/* Set the display info, using edid if available, otherwise
* resetting the values to defaults. This duplicates the work
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 19426f28b411..056e735ef932 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1991,7 +1991,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
void *data)
{
int i, j = 0, valid_extensions = 0;
- u8 *edid, *new;
+ u8 *edid, *new, ext_eeodb_blk_size;
struct edid *override;
override = drm_get_override_edid(connector);
@@ -2051,7 +2051,40 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
}
kfree(edid);
+ return (struct edid *)new;
+ }
+
+ if (drm_edid_is_hf_eeodb_blk_available((struct edid *)edid)) {
+ ext_eeodb_blk_size = drm_edid_read_hf_eeodb_blk_size((struct edid *)edid);
+
+ // no more ext blk wait for read
+ if (ext_eeodb_blk_size <= 1)
+ return (struct edid *)edid;
+
+ new = krealloc(edid, (ext_eeodb_blk_size + 1) * EDID_LENGTH, GFP_KERNEL);
+ if (!new)
+ goto out;
edid = new;
+
+ valid_extensions = ext_eeodb_blk_size - 1;
+ for (j = 2; j <= ext_eeodb_blk_size; j++) {
+ u8 *block = edid + j * EDID_LENGTH;
+
+ for (i = 0; i < 4; i++) {
+ if (get_edid_block(data, block, j, EDID_LENGTH))
+ goto out;
+ if (drm_edid_block_valid(block, j, false, NULL))
+ break;
+ }
+
+ if (i == 4)
+ valid_extensions--;
+ }
+
+ if (valid_extensions != ext_eeodb_blk_size - 1) {
+ DRM_ERROR("Not able to retrieve proper EDID contain HF-EEODB data.\n");
+ goto out;
+ }
}
return (struct edid *)edid;
@@ -3315,15 +3348,17 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
#define VIDEO_BLOCK 0x02
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
-#define HDR_STATIC_METADATA_BLOCK 0x6
-#define USE_EXTENDED_TAG 0x07
-#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
+#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
+#define HDR_STATIC_METADATA_BLOCK 0x06
+#define USE_EXTENDED_TAG 0x07
#define EXT_VIDEO_DATA_BLOCK_420 0x0E
-#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F
+#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F
+#define EXT_VIDEO_HF_EEODB_DATA_BLOCK 0x78
#define EDID_BASIC_AUDIO (1 << 6)
#define EDID_CEA_YCRCB444 (1 << 5)
#define EDID_CEA_YCRCB422 (1 << 4)
#define EDID_CEA_VCDB_QS (1 << 6)
+#define HF_EEODB_LENGTH 2
/*
* Search EDID for CEA extension block.
@@ -4273,6 +4308,37 @@ static bool cea_db_is_y420vdb(const u8 *db)
return true;
}
+static bool cea_db_is_hdmi_forum_eeodb(const u8 *db)
+{
+ if (cea_db_tag(db) != USE_EXTENDED_TAG)
+ return false;
+
+ if (cea_db_payload_len(db) != HF_EEODB_LENGTH)
+ return false;
+
+ if (cea_db_extended_tag(db) != EXT_VIDEO_HF_EEODB_DATA_BLOCK)
+ return false;
+
+ return true;
+}
+
+bool drm_edid_is_hf_eeodb_blk_available(const struct edid *edid)
+{
+ const u8 *eeodb_header = (u8 *)edid + EDID_LENGTH + 4;
+
+ if (!edid->extensions)
+ return false;
+
+ return cea_db_is_hdmi_forum_eeodb(eeodb_header);
+}
+EXPORT_SYMBOL_GPL(drm_edid_is_hf_eeodb_blk_available);
+
+u8 drm_edid_read_hf_eeodb_blk_size(const struct edid *edid)
+{
+ return ((u8 *)edid)[EDID_LENGTH + 6];
+}
+EXPORT_SYMBOL_GPL(drm_edid_read_hf_eeodb_blk_size);
+
#define for_each_cea_db(cea, i, start, end) \
for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 144c495b99c4..22872d9731a8 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -593,5 +593,7 @@ drm_display_mode_from_cea_vic(struct drm_device *dev,
const u8 *drm_find_edid_extension(const struct edid *edid,
int ext_id, int *ext_index);
+bool drm_edid_is_hf_eeodb_blk_available(const struct edid *edid);
+u8 drm_edid_read_hf_eeodb_blk_size(const struct edid *edid);
#endif /* __DRM_EDID_H__ */
--
2.17.1
