diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/mpc8xxx/ddr/ctrl_regs.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c index 2505041..a92f1a3 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 */ |