diff options
Diffstat (limited to 'drivers/ddr/fsl/ctrl_regs.c')
| -rw-r--r-- | drivers/ddr/fsl/ctrl_regs.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c index fe8aa98e8e..03d7ff17dd 100644 --- a/drivers/ddr/fsl/ctrl_regs.c +++ b/drivers/ddr/fsl/ctrl_regs.c @@ -324,6 +324,7 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr, #elif defined(CONFIG_SYS_FSL_DDR3) unsigned int data_rate = get_ddr_freq(0); int txp; + unsigned int ip_rev; int odt_overlap; /* * (tXARD and tXARDS). Empirical? @@ -336,7 +337,25 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr, */ txp = max((int)mclk_ps * 3, (mclk_ps > 1540 ? 7500 : 6000)); - tmrd_mclk = 4; + ip_rev = fsl_ddr_get_version(); + if (ip_rev >= 0x40700) { + /* + * MRS_CYC = max(tMRD, tMOD) + * tMRD = 4nCK (8nCK for RDIMM) + * tMOD = max(12nCK, 15ns) + */ + tmrd_mclk = max((unsigned int)12, picos_to_mclk(15000)); + } else { + /* + * MRS_CYC = tMRD + * tMRD = 4nCK (8nCK for RDIMM) + */ + if (popts->registered_dimm_en) + tmrd_mclk = 8; + else + tmrd_mclk = 4; + } + /* set the turnaround time */ /* |