From 9d0d02a561bb28e77b27583d8ed694eee75df7b0 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Tue, 29 Jan 2019 16:48:43 +0800
Subject: [PATCH] jesd204sync: increase tolerance for coarse->final target in
 calibrate_sysref_target

There is plenty of slack (it only needs to meet timing at the RTIO frequency).
---
 artiq/firmware/libboard_artiq/jesd204sync.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/artiq/firmware/libboard_artiq/jesd204sync.rs b/artiq/firmware/libboard_artiq/jesd204sync.rs
index 8067ab438..30d5aef3b 100644
--- a/artiq/firmware/libboard_artiq/jesd204sync.rs
+++ b/artiq/firmware/libboard_artiq/jesd204sync.rs
@@ -192,7 +192,7 @@ fn calibrate_sysref_target(rising_average: i32, falling_average: i32) -> Result<
             ((falling_average - (DDMTD_N - rising_average))/2 + DDMTD_N) % DDMTD_N
         };
     info!("  SYSREF calibration coarse target: {}", coarse_target);
-    reach_sysref_ddmtd_target(coarse_target, 4)?;
+    reach_sysref_ddmtd_target(coarse_target, 8)?;
     let target = measure_ddmdt_phase();
     info!("  ...done, target={}", target);
     Ok(target)