driver/ddr/fsl: Update MR5 RTT park

For four chip-selects enabled case, RTT is parked on all of them.

Signed-off-by: York Sun <yorksun@freescale.com>

diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c
index 36bf647791b29cd0ec9f33dab09d86e83a4bca95..99714bf4c14b5d22ef7f62f440aec2c4a500094f 100644 (file)
--- 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;
                        }