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authorLudwig Zenz <lzenz@dh-electronics.de>2019-04-15 11:13:08 +0200
committerStefano Babic <sbabic@denx.de>2019-04-25 19:16:24 +0200
commitaa34505653a3006ed4ad511da5d56a796d2ddf52 (patch)
tree6d1d7ebf6b8d33e2ba77c1928c6f71ffb7df7cab /board/dhelectronics
parenta44ca1346dc7fdba4ae4f2906078f6b737c3f109 (diff)
ARM: imx6: DHCOM i.MX6 PDK: use Kconfig for inclusion of DDR calibration
The four x16 DDR3 are wired in T-topology. From NXP AN4467: 'Although not required, T-Topologies may also benefit from performing Write Leveling as there are package delays on both the processor and DDR devices that can be de-skewed by performing Write Leveling. Therefore, Freescale recommends determining Write Leveling calibration parameters for all boards, regardless of topology used.' That is why write level calibration is also done. Signed-off-by: Ludwig Zenz <lzenz@dh-electronics.com>
Diffstat (limited to 'board/dhelectronics')
-rw-r--r--board/dhelectronics/dh_imx6/dh_imx6_spl.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/board/dhelectronics/dh_imx6/dh_imx6_spl.c b/board/dhelectronics/dh_imx6/dh_imx6_spl.c
index 1815386a8a..2939389de3 100644
--- a/board/dhelectronics/dh_imx6/dh_imx6_spl.c
+++ b/board/dhelectronics/dh_imx6/dh_imx6_spl.c
@@ -482,6 +482,29 @@ static void setup_iomux_usb(void)
SETUP_IOMUX_PADS(usb_pads);
}
+/* Perform DDR DRAM calibration */
+static int spl_dram_perform_cal(struct mx6_ddr_sysinfo const *sysinfo)
+{
+ int ret = 0;
+
+#ifdef CONFIG_MX6_DDRCAL
+ udelay(100);
+ ret = mmdc_do_write_level_calibration(sysinfo);
+ if (ret) {
+ printf("DDR3: Write level calibration error [%d]\n", ret);
+ return ret;
+ }
+
+ ret = mmdc_do_dqs_calibration(sysinfo);
+ if (ret) {
+ printf("DDR3: DQS calibration error [%d]\n", ret);
+ return ret;
+ }
+#endif /* CONFIG_MX6_DDRCAL */
+
+ return ret;
+}
+
/* DRAM */
static void dhcom_spl_dram_init(void)
@@ -509,8 +532,7 @@ static void dhcom_spl_dram_init(void)
}
/* Perform DDR DRAM calibration */
- udelay(100);
- mmdc_do_dqs_calibration(&dhcom_ddr_64bit);
+ spl_dram_perform_cal(&dhcom_ddr_64bit);
} else if (is_cpu_type(MXC_CPU_MX6DL)) {
mx6sdl_dram_iocfg(64, &dhcom6sdl_ddr_ioregs,
@@ -528,8 +550,7 @@ static void dhcom_spl_dram_init(void)
}
/* Perform DDR DRAM calibration */
- udelay(100);
- mmdc_do_dqs_calibration(&dhcom_ddr_64bit);
+ spl_dram_perform_cal(&dhcom_ddr_64bit);
} else if (is_cpu_type(MXC_CPU_MX6SOLO)) {
mx6sdl_dram_iocfg(32, &dhcom6sdl_ddr_ioregs,
@@ -552,8 +573,7 @@ static void dhcom_spl_dram_init(void)
}
/* Perform DDR DRAM calibration */
- udelay(100);
- mmdc_do_dqs_calibration(&dhcom_ddr_32bit);
+ spl_dram_perform_cal(&dhcom_ddr_32bit);
}
}