[PATCH 4/4] venice: display DRAM MR registers and decoding if debug enabled

[Tim Harvey]

While this is interesting and useful for debugging there isn't extremely
useful information so we will only show it if debug is enabled.

Signed-off-by: Tim Harvey <thar...@gateworks.com>
---
 board/gateworks/venice/spl.c | 61 +++++++++++++++++++++++++++++++++++-
 1 file changed, 60 insertions(+), 1 deletion(-)

diff --git a/board/gateworks/venice/spl.c b/board/gateworks/venice/spl.c
index d9bc593fa0d5..5f621ade9287 100644
--- a/board/gateworks/venice/spl.c
+++ b/board/gateworks/venice/spl.c
@@ -2,6 +2,7 @@
 /*
  * Copyright 2021 Gateworks Corporation
  */
+#define DEBUG
 
 #include <cpu_func.h>
 #include <hang.h>
@@ -271,7 +272,65 @@ void board_init_f(ulong dummy)
                       dram_timing->fsp_msg[0].drate,
                       dram_timing->fsp_msg[0].drate / 2,
                       dram_desc[0] ? dram_desc : "");
-               puts("\n");
+
+#ifdef DEBUG
+               u8 mr[9] = { 0 };
+               /* Read MR5-MR8 to obtain details about DRAM part (and verify 
DRAM working) */
+               for (i = 5; i < 9; i++)
+                       mr[i] = lpddr4_mr_read(0xf, i) & 0xff;
+
+               printf(" (0x%02x%02x%02x%02x", mr[5], mr[6], mr[7], mr[8]);
+               /* MR5 MFG_ID */
+               switch (mr[5]) {
+               case 0xff:
+                       printf(" Micron");
+                       break;
+               default:
+                       break;
+               }
+               /* MR8 OP[7:6] Width */
+               i = 0;
+               switch ((mr[8] >> 6) & 0x3) {
+               case 0:
+                       i = 16;
+                       break;
+               case 1:
+                       i = 8;
+                       break;
+               }
+               if (i)
+                       printf(" x%d", i);
+               /* MR8 OP[5:2] Density */
+               i = 0;
+               switch ((mr[8] >> 2) & 0xf) {
+               case 0:
+                       i = 4;
+                       break;
+               case 1:
+                       i = 6;
+                       break;
+               case 2:
+                       i = 8;
+                       break;
+               case 3:
+                       i = 12;
+                       break;
+               case 4:
+                       i = 16;
+                       break;
+               case 5:
+                       i = 24;
+                       break;
+               case 6:
+                       i = 32;
+                       break;
+               default:
+                       break;
+               }
+               if (i)
+                       printf(" %dGb per die", i);
+#endif
+               puts(")\n");
        } else {
                hang();
        }
-- 
2.25.1