ram: stm32mp1: the property st, phy-cal becomes optional

This parameter "st,phy-cal" becomes optional and when it is
absent the built-in PHY calibration is done.

It is the case in the helper dtsi file "stm32mp15-ddr.dtsi"
except if DDR_PHY_CAL_SKIP is defined.

This patch also impact the ddr interactive mode
- the registers of the param 'phy.cal' are initialized to 0 when
  "st,phy-cal" is not present in device tree (default behavior when
  DDR_PHY_CAL_SKIP is not activated)
- the info 'cal' field can be use to change the calibration behavior
  - cal=1 => use param phy.cal to initialize the PHY, built-in training
             is skipped
  - cal=0 => param phy.cal is absent, built-in training is used (default)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/ram/stm32mp1/stm32mp1_interactive.c b/drivers/ram/stm32mp1/stm32mp1_interactive.c
index cedf92cb5f1..805c9ddaadc 100644
--- a/drivers/ram/stm32mp1/stm32mp1_interactive.c
+++ b/drivers/ram/stm32mp1/stm32mp1_interactive.c
@@ -106,7 +106,7 @@ static void stm32mp1_do_usage(void)
 		"help                       displays help\n"
 		"info                       displays DDR information\n"
 		"info  <param> <val>        changes DDR information\n"
-		"      with <param> = step, name, size or speed\n"
+		"      with <param> = step, name, size, speed or cal\n"
 		"freq                       displays the DDR PHY frequency in kHz\n"
 		"freq  <freq>               changes the DDR PHY frequency\n"
 		"param [type|reg]           prints input parameters\n"
@@ -160,6 +160,7 @@ static void stm32mp1_do_info(struct ddr_info *priv,
 		printf("name = %s\n", config->info.name);
 		printf("size = 0x%x\n", config->info.size);
 		printf("speed = %d kHz\n", config->info.speed);
+		printf("cal = %d\n", config->p_cal_present);
 		return;
 	}
 
@@ -208,6 +209,16 @@ static void stm32mp1_do_info(struct ddr_info *priv,
 		}
 		return;
 	}
+	if (!strcmp(argv[1], "cal")) {
+		if (strict_strtoul(argv[2], 10, &value) < 0 ||
+		    (value != 0 && value != 1)) {
+			printf("invalid value %s\n", argv[2]);
+		} else {
+			config->p_cal_present = value;
+			printf("cal = %d\n", config->p_cal_present);
+		}
+		return;
+	}
 	printf("argument %s invalid\n", argv[1]);
 }