arm: imx6: Enable DDR calibration on Novena

Enable the DDR calibration functionality on Novena to deal with the
memory SoDIMM on this board. Moreover, tweak the initial DDR DRAM
parameters so the calibration works properly.

Signed-off-by: Marek Vasut <marex@denx.de>

board/kosagi/novena/novena_spl.c

@@ -434,8 +434,8 @@ static struct mx6dq_iomux_ddr_regs novena_ddr_ioregs = {
 	.dram_ras		= 0x00000038,
 	.dram_reset		= 0x00000038,
 	/* SDCKE[0:1]: 100k pull-up */
-	.dram_sdcke0		= 0x00003000,
-	.dram_sdcke1		= 0x00003000,
+	.dram_sdcke0		= 0x00000038,
+	.dram_sdcke1		= 0x00000038,
 	/* SDBA2: pull-up disabled */
 	.dram_sdba2		= 0x00000000,
 	/* SDODT[0:1]: 100k pull-up, 40 ohm */
@@ -512,10 +512,10 @@ static struct mx6_ddr_sysinfo novena_ddr_info = {
 	/* Single chip select */
 	.ncs		= 1,
 	.cs1_mirror	= 0,
-	.rtt_wr		= 1,	/* RTT_Wr = RZQ/4 */
-	.rtt_nom	= 2,	/* RTT_Nom = RZQ/2 */
-	.walat		= 3,	/* Write additional latency */
-	.ralat		= 7,	/* Read additional latency */
+	.rtt_wr		= 0,	/* RTT_Wr = RZQ/4 */
+	.rtt_nom	= 1,	/* RTT_Nom = RZQ/2 */
+	.walat		= 0,	/* Write additional latency */
+	.ralat		= 5,	/* Read additional latency */
 	.mif3_mode	= 3,	/* Command prediction working mode */
 	.bi_on		= 1,	/* Bank interleaving enabled */
 	.sde_to_rst	= 0x10,	/* 14 cycles, 200us (JEDEC default) */
@@ -530,9 +530,9 @@ static struct mx6_ddr3_cfg elpida_4gib_1600 = {
 	.rowaddr	= 16,
 	.coladdr	= 10,
 	.pagesz		= 2,
-	.trcd		= 1300,
-	.trcmin		= 4900,
-	.trasmin	= 3590,
+	.trcd		= 1375,
+	.trcmin		= 4875,
+	.trasmin	= 3500,
 };
 
 static void ccgr_init(void)
@@ -601,6 +601,11 @@ void board_init_f(ulong dummy)
 	mx6dq_dram_iocfg(64, &novena_ddr_ioregs, &novena_grp_ioregs);
 	mx6_dram_cfg(&novena_ddr_info, &novena_mmdc_calib, &elpida_4gib_1600);
 
+	/* Perform DDR DRAM calibration */
+	udelay(100);
+	mmdc_do_write_level_calibration();
+	mmdc_do_dqs_calibration();
+
 	/* Clear the BSS. */
 	memset(__bss_start, 0, __bss_end - __bss_start);