From bda54b11778ab2651dfee34b1d72a57d119d19e3 Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Fri, 28 Aug 2020 17:59:24 +0200
Subject: [PATCH] software/liblitedram: reset ddrphy before initialization if
 rst CSR present (added on 7-series).

---
 litex/soc/software/liblitedram/sdram.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/litex/soc/software/liblitedram/sdram.c b/litex/soc/software/liblitedram/sdram.c
index 7946a9d16..0714d2d33 100644
--- a/litex/soc/software/liblitedram/sdram.c
+++ b/litex/soc/software/liblitedram/sdram.c
@@ -798,6 +798,12 @@ int sdrinit(void)
 {
 	printf("Initializing DRAM @0x%08x...\n", MAIN_RAM_BASE);
 
+#if CSR_DDRPHY_RST_ADDR
+	ddrphy_rst_write(1);
+	cdelay(100);
+	ddrphy_rst_write(0);
+#endif
+
 #ifdef CSR_DDRCTRL_BASE
 	ddrctrl_init_done_write(0);
 	ddrctrl_init_error_write(0);