After changing SDRAM_CLKTR phase value rerun the memory preload initialization sequence (INITPLR) to reset and relock the memory DLL. Changing the SDRAM_CLKTR memory clock phase coarse timing adjustment effects the phase relationship of the internal, to the PPC chip, and external, to the PPC chip, versions of MEMCLK_OUT.
Signed-off-by: Adam Graham agraham@amcc.com Signed-off-by: Victor Gallardo vgallardo@amcc.com --- v2: - fix commit text. line to long.
cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c | 21 +++++++++++++++++++++ 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 |