memory: stm32-omi: Fix period_ps overflow

In both drivers hyperbus-stm32.c and stm32-ospi.c, period_ps is computed
using the following formula:

period_ps = NSEC_PER_SEC / (bus_freq / 1000)

In case bus freq < 15.259 Mhz, we got period_ps > 65535 which can't be
stored in a u16.
Convert period_ps from u16 to u32 to fix this issue.
Update stm32_omi_find_byp_cmd() and stm32_omi_dlyb_configure() prototype
accordingly.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Change-Id: If8736e6bad4c5c6f240fd01a4829a441f1edb711
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/557861
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>

Author: Patrice Chotard

drivers/memory/stm32-omi.c

@@ -175,7 +175,7 @@ int stm32_omi_dlyb_set_cr(struct udevice *dev, u32 dlyb_cr)
 {
 	bool bypass_mode = false;
 	int ret;
-	u16 period_ps;
+	u32 period_ps;
 	u8 rx_tap, tx_tap;
 
 	period_ps = FIELD_GET(DLYBOS_BYP_CMD_MASK, dlyb_cr);
@@ -210,9 +210,9 @@ static const u16 dlybos_delay_ps[STM32_DLYBOS_DELAY_NB] = {
 22336, 23968, 25568, 27168, 28768, 30400, 32000, 33600, 35232, 36832, 38432, 40032
 };
 
-static u32 stm32_omi_find_byp_cmd(u16 period_ps)
+static u32 stm32_omi_find_byp_cmd(u32 period_ps)
 {
-	u16 half_period_ps = period_ps / 2;
+	u32 half_period_ps = period_ps / 2;
 	u8 max = STM32_DLYBOS_DELAY_NB - 1;
 	u8 i, min = 0;
 
@@ -249,7 +249,7 @@ void stm32_omi_dlyb_stop(struct udevice *dev)
 }
 
 int stm32_omi_dlyb_configure(struct udevice *dev,
-			     bool bypass_mode, u16 period_ps)
+			     bool bypass_mode, u32 period_ps)
 {
 	struct stm32_omi_plat *omi_plat = dev_get_plat(dev);
 	u32 sr, mask, val;

drivers/mtd/stm32_hyperbus.c

@@ -189,7 +189,7 @@ static int stm32_hb_calibrate(struct stm32_hb_priv *priv)
 {
 	struct stm32_omi_plat *omi_plat = dev_get_plat(priv->omi_dev);
 	u32 prescaler;
-	u16 period_ps = 0;
+	u32 period_ps = 0;
 	u8 window_len = 0;
 	int ret;
 	bool bypass_mode = false;

drivers/spi/stm32_ospi.c

@@ -455,7 +455,7 @@ static int stm32_ospi_dtr_calibration(struct udevice *bus)
 	phys_addr_t regs_base = omi_plat->regs_base;
 	u32 dcr2, prescaler;
 	uint bus_freq;
-	u16 period_ps = 0;
+	u32 period_ps = 0;
 	u8 window_len = 0;
 	int ret;
 	bool bypass_mode = false;

include/stm32_omi.h

@@ -173,7 +173,7 @@ struct stm32_tap_window {
 };
 
 int stm32_omi_dlyb_configure(struct udevice *dev,
-			     bool bypass_mode, u16 period_ps);
+			     bool bypass_mode, u32 period_ps);
 int stm32_omi_dlyb_find_tap(struct udevice *dev, bool rx_only, u8 *window_len);
 int stm32_omi_dlyb_set_cr(struct udevice *dev, u32 dlyb_cr);
 void stm32_omi_dlyb_get_cr(struct udevice *dev, u32 *dlyb_cr);