diff options
Diffstat (limited to 'arch/arm/mach-imx/mx6/ddr.c')
| -rw-r--r-- | arch/arm/mach-imx/mx6/ddr.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/mach-imx/mx6/ddr.c b/arch/arm/mach-imx/mx6/ddr.c index 16df71083d..75efced8c7 100644 --- a/arch/arm/mach-imx/mx6/ddr.c +++ b/arch/arm/mach-imx/mx6/ddr.c @@ -108,7 +108,7 @@ int mmdc_do_write_level_calibration(struct mx6_ddr_sysinfo const *sysinfo) { struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR; struct mmdc_p_regs *mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR; - u32 esdmisc_val, zq_val; + u32 esdmisc_val, zq_val, mdmisc_val; u32 errors = 0; u32 ldectrl[4] = {0}; u32 ddr_mr1 = 0x4; @@ -131,6 +131,9 @@ int mmdc_do_write_level_calibration(struct mx6_ddr_sysinfo const *sysinfo) /* disable Adopt power down timer */ setbits_le32(&mmdc0->mapsr, 0x1); + /* Save old RALAT and WALAT values */ + mdmisc_val = readl(&mmdc0->mdmisc); + debug("Starting write leveling calibration.\n"); /* @@ -217,6 +220,9 @@ int mmdc_do_write_level_calibration(struct mx6_ddr_sysinfo const *sysinfo) writel(esdmisc_val, &mmdc0->mdref); writel(zq_val, &mmdc0->mpzqhwctrl); + /* restore WALAT/RALAT */ + writel(mdmisc_val, &mmdc0->mdmisc); + debug("\tMMDC_MPWLDECTRL0 after write level cal: 0x%08x\n", readl(&mmdc0->mpwldectrl0)); debug("\tMMDC_MPWLDECTRL1 after write level cal: 0x%08x\n", |