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-rw-r--r--drivers/ddr/fsl/ctrl_regs.c21
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 */
/*
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