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-rw-r--r--cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
index 83b9883..47ab39b 100644
--- a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
+++ b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
@@ -174,6 +174,23 @@ static inline void ecc_clear_status_reg(void)
#endif
}
+/*
+ * Reset and relock memory DLL after SDRAM_CLKTR change
+ */
+static inline void relock_memory_DLL(void)
+{
+ u32 reg;
+
+ mtsdram(SDRAM_MCOPT2, SDRAM_MCOPT2_IPTR_EXECUTE);
+
+ do {
+ mfsdram(SDRAM_MCSTAT, reg);
+ } while (!(reg & SDRAM_MCSTAT_MIC_COMP));
+
+ mfsdram(SDRAM_MCOPT2, reg);
+ mtsdram(SDRAM_MCOPT2, reg | SDRAM_MCOPT2_DCEN_ENABLE);
+}
+
static int ecc_check_status_reg(void)
{
u32 ecc_status;
@@ -981,6 +998,8 @@ u32 DQS_autocalibration(void)
mtsdram(SDRAM_CLKTR, clkp << 30);
+ relock_memory_DLL();
+
putc('\b');
putc(slash[loopi++ % 8]);
@@ -1170,6 +1189,8 @@ u32 DQS_autocalibration(void)
mtsdram(SDRAM_CLKTR, tcal.clocks.clktr << 30);
+ relock_memory_DLL();
+
mfsdram(SDRAM_RQDC, rqdc_reg);
rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);
mtsdram(SDRAM_RQDC, rqdc_reg |