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| author | Dave Liu <daveliu@freescale.com> | 2009-03-14 12:48:19 +0800 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2009-03-30 13:33:50 -0500 |
| commit | 6a8197836702991468cead5ead073f589e2623ad (patch) | |
| tree | da8979bf71471ade2083ad1a352a32f74a7234c4 /cpu/mpc8xxx/ddr | |
| parent | 540dcf1cb86961e11aa92c47671f27762c581d8c (diff) | |
| download | u-boot-imx-6a8197836702991468cead5ead073f589e2623ad.zip u-boot-imx-6a8197836702991468cead5ead073f589e2623ad.tar.gz u-boot-imx-6a8197836702991468cead5ead073f589e2623ad.tar.bz2 | |
fsl-ddr: Fix two bugs in the ddr infrastructure
1. wr_lat
UM said the total write latency for DDR2 is equal to
WR_LAT + ADD_LAT, the write latency is CL + ADD_LAT - 1.
so, the WR_LAT = CL - 1;
2. rd_to_pre
we missed to add the ADD_LAT for DDR2 case.
Reported-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Dave Liu <daveliu@freescale.com>
Diffstat (limited to 'cpu/mpc8xxx/ddr')
| -rw-r--r-- | cpu/mpc8xxx/ddr/ctrl_regs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/cpu/mpc8xxx/ddr/ctrl_regs.c b/cpu/mpc8xxx/ddr/ctrl_regs.c index 292980d..4c1498c 100644 --- a/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -302,12 +302,15 @@ static void set_timing_cfg_2(fsl_ddr_cfg_regs_t *ddr, */ wr_lat = 0; #elif defined(CONFIG_FSL_DDR2) - wr_lat = cas_latency + additive_latency - 1; + wr_lat = cas_latency - 1; #else #error "Fix WR_LAT for DDR3" #endif rd_to_pre = picos_to_mclk(common_dimm->tRTP_ps); +#if defined(CONFIG_FSL_DDR2) + rd_to_pre += additive_latency; +#endif wr_data_delay = popts->write_data_delay; cke_pls = picos_to_mclk(popts->tCKE_clock_pulse_width_ps); four_act = picos_to_mclk(popts->tFAW_window_four_activates_ps); |