diff options
| author | york <yorksun@freescale.com> | 2010-07-02 22:25:56 +0000 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2010-07-26 13:16:10 -0500 |
| commit | 5fb8a8a7315689cfbc81ec596cce160ee2ec6562 (patch) | |
| tree | c31aea32bb3c0bc782ec1b9213fd67fbcc9b8243 /arch | |
| parent | 9490ff48648d969caeb70dbc6e506175f8699617 (diff) | |
| download | u-boot-imx-5fb8a8a7315689cfbc81ec596cce160ee2ec6562.zip u-boot-imx-5fb8a8a7315689cfbc81ec596cce160ee2ec6562.tar.gz u-boot-imx-5fb8a8a7315689cfbc81ec596cce160ee2ec6562.tar.bz2 | |
powerpc/8xxx: Improvement to DDR parameters
Changes for P2020DS DDR applies to other 8xxx platform
Signed-off-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c | 14 | ||||
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/options.c | 1 |
2 files changed, 8 insertions, 7 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c index b2962d2..dccb7aa 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -199,7 +199,7 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr) unsigned char act_pd_exit_mclk; /* Precharge powerdown exit timing (tXP). */ unsigned char pre_pd_exit_mclk; - /* Precharge powerdown exit timing (tAXPD). */ + /* ODT powerdown exit timing (tAXPD). */ unsigned char taxpd_mclk; /* Mode register set cycle time (tMRD). */ unsigned char tmrd_mclk; @@ -211,13 +211,13 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr) * we use the tXP instead of it. * tXP=max(3nCK, 7.5ns) for DDR3. * spec has not the tAXPD, we use - * tAXPD=8, need design to confirm. + * tAXPD=1, need design to confirm. */ 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; + taxpd_mclk = 1; tmrd_mclk = 4; /* set the turnaround time */ trwt_mclk = 1; @@ -1031,9 +1031,9 @@ 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_on = 2; /* 2 clocks */ rodt_off = 4; /* 4 clocks */ - wodt_on = 2; /* 1 clocks */ + wodt_on = 1; /* 1 clocks */ wodt_off = 4; /* 4 clocks */ #endif @@ -1106,9 +1106,9 @@ static void set_ddr_wrlvl_cntl(fsl_ddr_cfg_regs_t *ddr, unsigned int wrlvl_en, /* * Write leveling repetition time * at least tWLO + 6 clocks clocks - * we set it 32 + * we set it 64 */ - wrlvl_wlr = 0x5; + wrlvl_wlr = 0x6; /* * Write leveling start time * The value use for the DQS_ADJUST for the first sample diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c b/arch/powerpc/cpu/mpc8xxx/ddr/options.c index e4805d3..774c0e4 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c @@ -204,6 +204,7 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, * meet the tQDSS under different loading. */ popts->wrlvl_en = 1; + popts->zq_en = 1; popts->wrlvl_override = 0; #endif |