There is a 400ms delay on HDCP authentication (from 19:304 to 19:713). Here is part of the info from ADV7619 log
-Rx: 19:304 ----------> Int: AKSV Update on port A, RxState.Encrypted = 0
-Rx: 19:304 AKSV Interrupt and BKSVs not ready
-Tx: 19:319 #### Muted using: BLKOUT ASP (RX Aksv and TX not auth)
-Rx: 19:336 ----------> Int: HDMI=0
-Tx: 19:376 HDCP and Frame Encryption Enabled
.....
-Rx: 19:399 Source signal changed to DVI
-Rx: 19:450 ----------> Int: HDMI=0
......
-Rx: 19:596 Source signal changed to DVI
......
-Rx: 19:692 Source signal changed to DVI
-Tx: 19:713 HDCP authenticated
-Tx: 19:716 1 of 1 BKSVs Read
82 7e 4c c9 b5
-Tx: 19:716 BKSV list sent to HDMI RX
-Rx: 19:716 Got New BKSVs from HDMI TX
-Rx: 19:728 Writing 1 BKSVs to source
-Rx: 19:728 Writing RX BSTATUS = 0x0101
-Rx: 19:732 BKSV List ready bit set
-Tx: 19:737 HDCP Ri mismatch error received
-Rx: 19:740 Received HDCP error from TX
Sounds like the delay is introduced when Source mode is changed to DVI. We will do some test and get back to you.