From f6d6611a81bf9bc3015fefd280dad34fe455f2ed Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Thu, 24 Feb 2022 17:31:54 +0100
Subject: [PATCH] software/liblitedram: Introduce SDRAM_PHY_DELAY_JUMP and set
 to 4 on 7-Series instead of 1 to improve calibration robustness on some
 boards.

This is for example required on the STLV7325 board.
---
 litex/soc/software/liblitedram/sdram.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/litex/soc/software/liblitedram/sdram.c b/litex/soc/software/liblitedram/sdram.c
index 859bb121d..277d0c641 100644
--- a/litex/soc/software/liblitedram/sdram.c
+++ b/litex/soc/software/liblitedram/sdram.c
@@ -398,14 +398,16 @@ static void sdram_leveling_center_module(
 
 	/* Get a bit further into the working zone */
 #if SDRAM_PHY_DELAYS > 32
-	for(i=0;i<16;i++) {
+	#define	SDRAM_PHY_DELAY_JUMP 16
+#elif SDRAM_PHY_DELAYS > 8
+	#define SDRAM_PHY_DELAY_JUMP 4
+#else
+	#define SDRAM_PHY_DELAY_JUMP 1
+#endif
+	for(i=0;i<SDRAM_PHY_DELAY_JUMP;i++) {
 		delay += 1;
 		inc_delay(module);
 	}
-#else
-	delay++;
-	inc_delay(module);
-#endif
 
 	/* Find largest working delay */
 	while(1) {