1. TIMING_CFG_0[ACT_PD_EXIT] was set to 6 clocks, but It should be set to tXP parameter, tXP=max(3CK, 7.5ns) 2. TIMING_CFG_0[PRE_PD_EXIT] was set to 6 clocks, but It should be set to tXP (if MR0[A12]=1) else to tXPDLL parameter We are setting the mode register MR0[A12]='1' 3. TIMING_CFG_5[RODT_ON] should be set to WL-2 4. TIMING_CFG_5[RODT_OFF] should be set to WL-1 5. TIMING_CFG_5[WODT_ON] should be set to WL-2 6. TIMING_CFG_5[WODT_OFF] should be set to WL-1
ps: WL=TIMING_CFG_2[WR_LAT]
The original work was finished by Mazyar Razzaz and Travis Wheatley.
Signed-off-by: Dave Liu daveliu@freescale.com Signed-off-by: Travis Wheatley travis.wheatley@freescale.com --- cpu/mpc8xxx/ddr/ctrl_regs.c | 17 ++++++++++------- 1 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c index 2505041..2736006 100644 --- a/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -188,12 +188,13 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr) * The DDR3 spec has not tXARD, * we use the tXP instead of it. * tXP=max(3nCK, 7.5ns) for DDR3. - * we use the tXP=6 * spec has not the tAXPD, we use * tAXPD=8, need design to confirm. */ - act_pd_exit_mclk = 6; - pre_pd_exit_mclk = 6; + int tXP = max((get_memory_clk_period_ps() * 3), 7500); /* unit=ps */ + act_pd_exit_mclk = picos_to_mclk(tXP); + /* Mode register MR0[A12] is '1' - fast exit */ + pre_pd_exit_mclk = act_pd_exit_mclk; taxpd_mclk = 8; tmrd_mclk = 4; #else /* CONFIG_FSL_DDR2 */ @@ -962,10 +963,12 @@ static void set_timing_cfg_5(fsl_ddr_cfg_regs_t *ddr) unsigned int wodt_off = 0; /* Write to ODT off */
#if defined(CONFIG_FSL_DDR3) - rodt_on = 3; /* 2 clocks */ - rodt_off = 4; /* 4 clocks */ - wodt_on = 2; /* 1 clocks */ - wodt_off = 4; /* 4 clocks */ + int wl = compute_cas_write_latency(); + + rodt_on = wl - 2; + rodt_off = wl - 1; + wodt_on = wl - 2; + wodt_off = wl - 1; #endif
ddr->timing_cfg_5 = (0