diff options
| author | Ludwig Zenz <lzenz@dh-electronics.de> | 2019-04-15 11:13:08 +0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2019-04-25 19:16:24 +0200 |
| commit | aa34505653a3006ed4ad511da5d56a796d2ddf52 (patch) | |
| tree | 6d1d7ebf6b8d33e2ba77c1928c6f71ffb7df7cab /board/dhelectronics | |
| parent | a44ca1346dc7fdba4ae4f2906078f6b737c3f109 (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.c | 32 |
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); } } |