ARM: imx: vining2000: Enable DDR DRAM calibration

Enable DRAM calibration in SPL to improve behavior of the board
in edge conditions of the thermal envelope of the board and make
it even more stable.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Silvio Fricke <silvio.fricke@softing.com>
Cc: Stefano Babic <sbabic@denx.de>

board/softing/vining_2000/vining_2000.c

@@ -587,6 +587,11 @@ static void vining2000_spl_dram_init(void)
 
 	mx6sx_dram_iocfg(mem_ddr.width, &mx6_ddr_ioregs, &mx6_grp_ioregs);
 	mx6_dram_cfg(&sysinfo, &mx6_mmcd_calib, &mem_ddr);
+
+	/* Perform DDR DRAM calibration */
+	udelay(100);
+	mmdc_do_write_level_calibration(&sysinfo);
+	mmdc_do_dqs_calibration(&sysinfo);
 }
 
 void board_init_f(ulong dummy)

configs/vining_2000_defconfig

@@ -5,6 +5,7 @@ CONFIG_SPL_GPIO_SUPPORT=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SYS_MALLOC_F_LEN=0x4000
+CONFIG_MX6_DDRCAL=y
 CONFIG_TARGET_SOFTING_VINING_2000=y
 CONFIG_SPL_MMC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y