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| author | York Sun <yorksun@freescale.com> | 2011-02-10 10:13:10 -0800 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-02-10 23:40:02 -0600 |
| commit | 856e4b0d7fa366b300bae4f5b9512d7baac6bff1 (patch) | |
| tree | dedbbaa272786a4f7c87971b5f88864452754892 | |
| parent | b1d67857af0f66f3def3d0461c141d9b4eccc15e (diff) | |
| download | u-boot-imx-856e4b0d7fa366b300bae4f5b9512d7baac6bff1.zip u-boot-imx-856e4b0d7fa366b300bae4f5b9512d7baac6bff1.tar.gz u-boot-imx-856e4b0d7fa366b300bae4f5b9512d7baac6bff1.tar.bz2 | |
powerpc/8xxx: Add additional cycle to write-to-read turnaound for DDR3
When DDR data rate is higher than 1200MT/s or controller interleaving is
enabled, additional cycle for write-to-read turnaround is needed to satisfy
dynamic ODT timing.
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/ddr.h | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c index c3e1d76..936c195 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -236,9 +236,12 @@ static void set_timing_cfg_0(fsl_ddr_cfg_regs_t *ddr, * tAXPD=1, need design to confirm. */ int tXP = max((get_memory_clk_period_ps() * 3), 7500); /* unit=ps */ + unsigned int data_rate = fsl_ddr_get_mem_data_rate(); tmrd_mclk = 4; /* set the turnaround time */ trwt_mclk = 1; + if ((data_rate/1000000 > 1150) || (popts->memctl_interleaving)) + twrt_mclk = 1; if (popts->dynamic_power == 0) { /* powerdown is not used */ act_pd_exit_mclk = 1; diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ddr.h b/arch/powerpc/cpu/mpc8xxx/ddr/ddr.h index 35b60a0..c7c12c1 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/ddr.h +++ b/arch/powerpc/cpu/mpc8xxx/ddr/ddr.h @@ -80,5 +80,5 @@ extern void check_interleaving_options(fsl_ddr_info_t *pinfo); extern unsigned int mclk_to_picos(unsigned int mclk); extern unsigned int get_memory_clk_period_ps(void); extern unsigned int picos_to_mclk(unsigned int picos); - +extern unsigned int fsl_ddr_get_mem_data_rate(void); #endif |