fix(imx8m): fix the rank to rank space issue
update umctl2's setting based on phy training CDD value
to workaround the rank-to-rank space issue.
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Anson Huang <anson.huang@nxp.com>
Change-Id: I0fab18cdc378fda760daa0f89c4dd84eb46f7e11
diff --git a/plat/imx/imx8m/ddr/dram.c b/plat/imx/imx8m/ddr/dram.c
index 53605cd..1fea69d 100644
--- a/plat/imx/imx8m/ddr/dram.c
+++ b/plat/imx/imx8m/ddr/dram.c
@@ -44,6 +44,25 @@
}
}
+static void save_rank_setting(void)
+{
+ uint32_t i, offset;
+ uint32_t pstate_num = dram_info.num_fsp;
+
+ for (i = 0U; i < pstate_num; i++) {
+ offset = i ? (i + 1) * 0x1000 : 0U;
+ dram_info.rank_setting[i][0] = mmio_read_32(DDRC_DRAMTMG2(0) + offset);
+ if (dram_info.dram_type != DDRC_LPDDR4) {
+ dram_info.rank_setting[i][1] = mmio_read_32(DDRC_DRAMTMG9(0) + offset);
+ }
+#if !defined(PLAT_imx8mq)
+ dram_info.rank_setting[i][2] = mmio_read_32(DDRC_RANKCTL(0) + offset);
+#endif
+ }
+#if defined(PLAT_imx8mq)
+ dram_info.rank_setting[0][2] = mmio_read_32(DDRC_RANKCTL(0));
+#endif
+}
/* Restore the ddrc configs */
void dram_umctl2_init(struct dram_timing_info *timing)
{
@@ -150,6 +169,9 @@
}
dram_info.num_fsp = i;
+ /* save the DRAMTMG2/9 for rank to rank workaround */
+ save_rank_setting();
+
/* check if has bypass mode support */
if (dram_info.timing_info->fsp_table[idx] < 666) {
dram_info.bypass_mode = true;