From: Michael Bode <michael.bode@bshg.com>
Date: Wed, 21 May 2025 09:47:32 +0000 (+0200)
Subject: board: bsh: imx6ulz_smm_m2: Add delay between DRAM read access
X-Git-Tag: v2025.07-rc3~8^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7b301c9061401eaea34e19e65cb1862269c9001;p=pandora-u-boot.git

board: bsh: imx6ulz_smm_m2: Add delay between DRAM read access

A small delay between DRAM read access with wrong parameters and
reconfiguration is necessary.
Without a delay between DRAM read access and a following reconfiguration
this reconfiguration fails for certain DRAM chips (Nanya).

Signed-off-by: Michael Bode <michael.bode@bshg.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---

diff --git a/board/bsh/imx6ulz_smm_m2/spl.c b/board/bsh/imx6ulz_smm_m2/spl.c
index e8255b6d2a6..c330e4d6d39 100644
--- a/board/bsh/imx6ulz_smm_m2/spl.c
+++ b/board/bsh/imx6ulz_smm_m2/spl.c
@@ -13,6 +13,7 @@
 #include <asm/gpio.h>
 #include <asm/mach-imx/iomux-v3.h>
 #include <asm/mach-imx/boot_mode.h>
+#include <linux/delay.h>
 #include <linux/libfdt.h>
 #include <spl.h>
 #include <asm/arch/mx6-ddr.h>
@@ -65,10 +66,12 @@ static void spl_dram_init(void)
 		/* Already configured, nothing to do */
 		break;
 	case SZ_256M:
+		udelay(1);
 		ddr_cfg_write(&bsh_dram_timing_256mb);
 		break;
 	case SZ_128M:
 	default:
+		udelay(1);
 		ddr_cfg_write(&bsh_dram_timing_128mb);
 		break;
 	}