sayma: add JESD204 PHY done diagnostics

artiq/firmware/satman/jdcg.rs

@@ -11,7 +11,12 @@ pub mod jesd {
         unsafe {
             (csr::JDCG[dacno as usize].jesd_control_enable_write)(if en {1} else {0})
         }
-        clock::spin_us(5000);
+    }
+
+    pub fn phy_done(dacno: u8) -> bool {
+        unsafe {
+            (csr::JDCG[dacno as usize].jesd_control_phy_done_read)() != 0
+        }
     }
 
     pub fn ready(dacno: u8) -> bool {
@@ -80,7 +85,11 @@ pub mod jdac {
 
     fn init_one(dacno: u8) -> Result<(), &'static str> {
         jesd::enable(dacno, true);
-        clock::spin_us(10);
+        clock::spin_us(10_000);
+        if !jesd::phy_done(dacno) {
+            error!("JESD core PHY not done");
+            return Err("JESD core PHY not done");
+        }
         if !jesd::ready(dacno) {
             error!("JESD core reported not ready");
             return Err("JESD core reported not ready");