For four chip-selects enabled case, RTT is parked on all of them.
Signed-off-by: York Sun yorksun@freescale.com ---
drivers/ddr/fsl/ctrl_regs.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c index 36bf647..99714bf 100644 --- a/drivers/ddr/fsl/ctrl_regs.c +++ b/drivers/ddr/fsl/ctrl_regs.c @@ -1117,10 +1117,18 @@ static void set_ddr_sdram_mode_9(fsl_ddr_cfg_regs_t *ddr, unsigned short esdmode4 = 0; /* Extended SDRAM mode 4 */ unsigned short esdmode5; /* Extended SDRAM mode 5 */ int rtt_park = 0; - + bool four_cs = false; + +#if CONFIG_CHIP_SELECTS_PER_CTRL == 4 + if ((ddr->cs[0].config & SDRAM_CS_CONFIG_EN) && + (ddr->cs[1].config & SDRAM_CS_CONFIG_EN) && + (ddr->cs[2].config & SDRAM_CS_CONFIG_EN) && + (ddr->cs[3].config & SDRAM_CS_CONFIG_EN)) + four_cs = true; +#endif if (ddr->cs[0].config & SDRAM_CS_CONFIG_EN) { esdmode5 = 0x00000500; /* Data mask enable, RTT_PARK CS0 */ - rtt_park = 1; + rtt_park = four_cs ? 0 : 1; } else { esdmode5 = 0x00000400; /* Data mask enabled */ } @@ -1130,7 +1138,10 @@ static void set_ddr_sdram_mode_9(fsl_ddr_cfg_regs_t *ddr, | ((esdmode5 & 0xffff) << 0) );
- /* only mode_9 use 0x500, others use 0x400 */ + /* Normally only the first enabled CS use 0x500, others use 0x400 + * But when four chip-selects are all enabled, all mode registers + * need 0x500 to park. + */
debug("FSLDDR: ddr_sdram_mode_9) = 0x%08x\n", ddr->ddr_sdram_mode_9); if (unq_mrs_en) { /* unique mode registers are supported */ @@ -1138,7 +1149,7 @@ static void set_ddr_sdram_mode_9(fsl_ddr_cfg_regs_t *ddr, if (!rtt_park && (ddr->cs[i].config & SDRAM_CS_CONFIG_EN)) { esdmode5 |= 0x00000500; /* RTT_PARK */ - rtt_park = 1; + rtt_park = four_cs ? 0 : 1; } else { esdmode5 = 0x00000400; }