From d1f04e67c5b4b888b345d1f63b57446d5317cca3 Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 12 Oct 2020 10:58:43 +0200
Subject: [PATCH] software/liblitedram: use 2 cycles increment on write bitslip
 (for tCK steps).

---
 litex/soc/software/liblitedram/sdram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litex/soc/software/liblitedram/sdram.c b/litex/soc/software/liblitedram/sdram.c
index d75d67f52..282f9ab86 100644
--- a/litex/soc/software/liblitedram/sdram.c
+++ b/litex/soc/software/liblitedram/sdram.c
@@ -865,7 +865,7 @@ static void sdram_write_latency_calibration(void) {
 		/* Scan possible write windows */
 		best_score   = 0;
 		best_bitslip = 0;
-		for(bitslip=0; bitslip<SDRAM_PHY_BITSLIPS; bitslip++) {
+		for(bitslip=0; bitslip<SDRAM_PHY_BITSLIPS; bitslip+=2) { /* +2 for tCK steps */
 			score = 0;
 			/* sel module */
 			ddrphy_dly_sel_write(1 << module);