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>
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 @@
*/
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);