Patch set updated for coreboot: soc/intel/apollolake: Disable Periodic Retraining per-SKU

[Andrey Petrov]

Andrey Petrov ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/16320

-gerrit

commit 11ea95cfceb7b7a6e2ee6deac54d3afc0465907c
Author: Andrey Petrov 
Date:   Thu Aug 25 11:06:08 2016 -0700

soc/intel/apollolake: Disable Periodic Retraining per-SKU

Certain LPDDR4 models have some HW issues that can be worked around
    by turning off Periodic Retraining feature in the memory controller.
    Add option to disable PR per SKU.

BUG=chrome-os-partner:55466
    TEST=not tested yet

Change-Id: Ie7aa79586665f6d3a7edd854a9eef07e6a1b2ab8
    Signed-off-by: Andrey Petrov 
---
 src/mainboard/google/reef/romstage.c           | 2 ++
 src/soc/intel/apollolake/include/soc/meminit.h | 1 +
 src/soc/intel/apollolake/meminit.c             | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/src/mainboard/google/reef/romstage.c b/src/mainboard/google/reef/romstage.c
index e8d8e16..964dee4 100644
--- a/src/mainboard/google/reef/romstage.c
+++ b/src/mainboard/google/reef/romstage.c
@@ -103,6 +103,7 @@ static const struct lpddr4_sku skus[] = {
    	.ch0_dual_rank = 1,
    	.ch1_dual_rank = 1,
    	.part_num = "MT53B512M32D2NP",
+		.disable_periodic_retraining = 1,
    },
    /* MT53B256M32D1NP-062 WT:C - both logical channels */
    [3] = {
@@ -110,6 +111,7 @@ static const struct lpddr4_sku skus[] = {
    	.ch0_rank_density = LP4_8Gb_DENSITY,
    	.ch1_rank_density = LP4_8Gb_DENSITY,
    	.part_num = "MT53B256M32D1NP",
+		.disable_periodic_retraining = 1,
    },
    /* K4F8E304HB-MGCH - both logical channels */
    [PROTO_SKU] = {
diff --git a/src/soc/intel/apollolake/include/soc/meminit.h b/src/soc/intel/apollolake/include/soc/meminit.h
index c115c4a..06d2b58 100644
--- a/src/soc/intel/apollolake/include/soc/meminit.h
+++ b/src/soc/intel/apollolake/include/soc/meminit.h
@@ -102,6 +102,7 @@ struct lpddr4_sku {
    int ch0_dual_rank;
    int ch1_dual_rank;
    const char *part_num;
+	bool disable_periodic_retraining;
 };

struct lpddr4_cfg {
diff --git a/src/soc/intel/apollolake/meminit.c b/src/soc/intel/apollolake/meminit.c
index 03e9ac4..d0e7683 100644
--- a/src/soc/intel/apollolake/meminit.c
+++ b/src/soc/intel/apollolake/meminit.c
@@ -254,6 +254,8 @@ void meminit_lpddr4_by_sku(struct FSP_M_CONFIG *cfg,
    					sku->ch1_dual_rank,
    					lpcfg->swizzle_config);
    }
+
+	cfg->PeriodicRetrainingDisable = sku->disable_periodic_retraining;
 }

void save_lpddr4_dimm_info(const struct lpddr4_cfg *lp4cfg, size_t mem_sku)