ARM: mvebu: a38x: restore support for setting timing

This restores support for configuring the timing mode based on the
ddr_topology. This was originally implemented in commit 90bcc3d38d2b
("driver/ddr: Add support for setting timing in hws_topology_map") but
was removed as part of the upstream sync.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>

4 files changed, 17 insertions, 5 deletions

diff --git a/drivers/ddr/marvell/a38x/ddr3_training.c b/drivers/ddr/marvell/a38x/ddr3_training.c
index 1f26d506da..799c5ba089 100644
--- a/drivers/ddr/marvell/a38x/ddr3_training.c
+++ b/drivers/ddr/marvell/a38x/ddr3_training.c
@@ -365,6 +365,7 @@ int hws_ddr3_tip_init_controller(u32 dev_num, struct init_cntr_param *init_cntr_
 	u32 octets_per_if_num = ddr3_tip_dev_attr_get(dev_num, MV_ATTR_OCTET_PER_INTERFACE);
 	struct mv_ddr_topology_map *tm = mv_ddr_topology_map_get();
 	enum hws_ddr_freq freq = tm->interface_params[0].memory_freq;
+	enum mv_ddr_timing timing;
 
 	DEBUG_TRAINING_IP(DEBUG_LEVEL_TRACE,
 			  ("Init_controller, do_mrs_phy=%d, is_ctrl64_bit=%d\n",
@@ -603,8 +604,12 @@ int hws_ddr3_tip_init_controller(u32 dev_num, struct init_cntr_param *init_cntr_
 				      DUNIT_CTRL_HIGH_REG,
 				      (init_cntr_prm->msys_init << 7), (1 << 7)));
 
+			timing = tm->interface_params[if_id].timing;
+
 			if (mode_2t != 0xff) {
 				t2t = mode_2t;
+			} else if (timing != MV_DDR_TIM_DEFAULT) {
+				t2t = (timing == MV_DDR_TIM_2T) ? 1 : 0;
 			} else {
 				/* calculate number of CS (per interface) */
 				CHECK_STATUS(calc_cs_num
@@ -1268,6 +1273,7 @@ int ddr3_tip_freq_set(u32 dev_num, enum hws_access_type access_type,
 	u32 octets_per_if_num = ddr3_tip_dev_attr_get(dev_num, MV_ATTR_OCTET_PER_INTERFACE);
 	struct mv_ddr_topology_map *tm = mv_ddr_topology_map_get();
 	unsigned int tclk;
+	enum mv_ddr_timing timing = tm->interface_params[if_id].timing;
 
 	DEBUG_TRAINING_IP(DEBUG_LEVEL_TRACE,
 			  ("dev %d access %d IF %d freq %d\n", dev_num,
@@ -1410,6 +1416,8 @@ int ddr3_tip_freq_set(u32 dev_num, enum hws_access_type access_type,
 		/* Calculate 2T mode */
 		if (mode_2t != 0xff) {
 			t2t = mode_2t;
+		} else if (timing != MV_DDR_TIM_DEFAULT) {
+			t2t = (timing == MV_DDR_TIM_2T) ? 1 : 0;
 		} else {
 			/* Calculate number of CS per interface */
 			CHECK_STATUS(calc_cs_num(dev_num, if_id, &cs_num));
diff --git a/drivers/ddr/marvell/a38x/ddr_topology_def.h b/drivers/ddr/marvell/a38x/ddr_topology_def.h
index 2c589eb3a6..812224909a 100644
--- a/drivers/ddr/marvell/a38x/ddr_topology_def.h
+++ b/drivers/ddr/marvell/a38x/ddr_topology_def.h
@@ -64,6 +64,9 @@ struct if_params {
 
 	/* operation temperature */
 	enum mv_ddr_temperature interface_temp;
+
+	/* 2T vs 1T mode (by default computed from number of CSs) */
+	enum mv_ddr_timing timing;
 };
 
 struct mv_ddr_topology_map {
diff --git a/drivers/ddr/marvell/a38x/mv_ddr_plat.c b/drivers/ddr/marvell/a38x/mv_ddr_plat.c
index ce672e9dd4..2070bb38b0 100644
--- a/drivers/ddr/marvell/a38x/mv_ddr_plat.c
+++ b/drivers/ddr/marvell/a38x/mv_ddr_plat.c
@@ -674,11 +674,6 @@ static int mv_ddr_sw_db_init(u32 dev_num, u32 board_id)
 	dfs_low_freq = DFS_LOW_FREQ_VALUE;
 	calibration_update_control = 1;
 
-#ifdef CONFIG_ARMADA_38X
-	/* For a38x only, change to 2T mode to resolve low freq instability */
-	mode_2t = 1;
-#endif
-
 	ddr3_tip_a38x_get_medium_freq(dev_num, &medium_freq);
 
 	return MV_OK;
diff --git a/drivers/ddr/marvell/a38x/mv_ddr_topology.h b/drivers/ddr/marvell/a38x/mv_ddr_topology.h
index eb017a1497..7bef2d1e0e 100644
--- a/drivers/ddr/marvell/a38x/mv_ddr_topology.h
+++ b/drivers/ddr/marvell/a38x/mv_ddr_topology.h
@@ -36,6 +36,12 @@ enum mv_ddr_temperature {
 	MV_DDR_TEMP_HIGH
 };
 
+enum mv_ddr_timing {
+	MV_DDR_TIM_DEFAULT,
+	MV_DDR_TIM_1T,
+	MV_DDR_TIM_2T
+};
+
 enum mv_ddr_timing_data {
 	MV_DDR_TCK_AVG_MIN, /* sdram min cycle time (t ck avg min) */
 	MV_DDR_TAA_MIN, /* min cas latency time (t aa min) */