[PATCH v7 10/22] drm/edid: add helper for HDMI VSDB audio latency field length

[Jani Nikula]

Add a helper for skipping the HDMI VSDB audio latency fields.

There's a functional change for HDMI VSDB blocks that do not respect the
spec: "I_Latency_Fields_Present shall be zero if Latency_Fields_Present
is zero". We assume this to hold when skipping the latency fields, and
ignore non-zero I_Latency_Fields_Present if Latency_Fields_Present is
zero.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 847076b29594..93067b8dd9f6 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4695,6 +4695,16 @@ static bool hdmi_vsdb_i_latency_present(const u8 *db)
 	return hdmi_vsdb_latency_present(db) && db[8] & BIT(6);
 }
 
+static int hdmi_vsdb_latency_length(const u8 *db)
+{
+	if (hdmi_vsdb_i_latency_present(db))
+		return 4;
+	else if (hdmi_vsdb_latency_present(db))
+		return 2;
+	else
+		return 0;
+}
+
 /*
  * do_hdmi_vsdb_modes - Parse the HDMI Vendor Specific data block
  * @connector: connector corresponding to the HDMI sink
@@ -4720,13 +4730,7 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len)
 	if (!(db[8] & (1 << 5)))
 		goto out;
 
-	/* Latency_Fields_Present */
-	if (db[8] & (1 << 7))
-		offset += 2;
-
-	/* I_Latency_Fields_Present */
-	if (db[8] & (1 << 6))
-		offset += 2;
+	offset += hdmi_vsdb_latency_length(db);
 
 	/* the declared length is not long enough for the 2 first bytes
 	 * of additional video format capabilities */
-- 
2.34.1