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hw21/26: adapt power sequencing for NEO-M9 

NEO-M9 modems sometimes boot into Safe Boot mode because of the 3.3 V
power sequencing defined by the PMIC.

Change SPL/U-Boot to
- insert LDO feeding GNSS modem in automatic power sequencing
- reset GNSS module at power on reset.

id:420663
This commit is contained in:
Rene Straub 2023-08-23 08:22:21 +02:00
parent 4bbdb87d6b
commit 4e67fc3997
2 changed files with 47 additions and 7 deletions
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1
board/nm/common/da9063.h
View File

@ -57,6 +57,7 @@
#define PMIC_LDOx_CONF_MASK 0x80
#define PMIC_REG_ID_4_3 0x84
#define PMIC_REG_ID_6_5 0x85
#define PMIC_REG_BUCK_ILIM_A 0x9A
#define PMIC_REG_BUCK_ILIM_B 0x9B

51
board/nm/nmhw21/board.c
View File

@ -454,6 +454,26 @@ static void pmic_disable_auto_mode(void)
}
}
static void pmic_gnss_pwr_sequence(void)
{
int rc;
uint8_t val;
/*
* GNSS 3.3V needs to start at same time as board 3.3V.
* Modify LDO6 configuration accordingly if not already done.
*/
rc = da9063_get_reg(PMIC_REG_ID_6_5, &val);
if (!rc && (val != 0x20)) {
(void)da9063_set_reg(PMIC_REG_ID_6_5, 0x20); /* Add LDO6 to sequencer, slot 2 */
(void)da9063_set_reg(PMIC_REG_CONFIG_G, 0x64); /* LDO6 automatic enable control by sequencer */
}
/* Enable +3V3_GNSS (LDO6) */
(void)da9063_set_reg(PMIC_REG_LDO6_CONT, PMIC_LDOx_EN_MASK);
mdelay(2);
}
static void init_pmic_spl(void)
{
int bus;
@ -471,9 +491,7 @@ static void init_pmic_spl(void)
pmic_disable_auto_mode();
}
/* Enable +3V3_GNSS (LDO6) */
(void)da9063_set_reg(PMIC_REG_LDO6_CONT, PMIC_LDOx_EN_MASK);
mdelay(2);
pmic_gnss_pwr_sequence();
/* Enable +5V_CAN (LDO11 Switch) */
(void)da9063_set_reg(PMIC_REG_LDO11_CONT, PMIC_LDOx_EN_MASK);
@ -1148,12 +1166,33 @@ static void init_gsm(void)
#endif
}
static void init_gnss(void)
static void init_gnss(uint32_t reset_reason_shm_location)
{
volatile struct reset_registers* reset_regs = (struct reset_registers*)reset_reason_shm_location;
bool do_reset = false;
/*
* Release GNSS reset line, so that module starts up early
* Release GNSS reset line, so that module starts up early.
* Excpetion: If this is an initial power up, we reset the module to ensure defined operation.
* Reasoning: Some NEO-M9 modems start in Safe Boot mode, due to power sequencing.
*/
puts("GNSS: ");
if (rr_is_start_reason_valid(reset_regs)) {
if ((reset_regs->sr_events & SR_POR) == SR_POR) {
do_reset = true;
}
}
if (do_reset) {
puts("reset\n");
REQUEST_AND_CLEAR_GPIO(GPIO_RST_GNSS);
mdelay(110);
gpio_set_value(GPIO_RST_GNSS, 1);
} else {
puts("init\n");
REQUEST_AND_SET_GPIO(GPIO_RST_GNSS);
}
}
static void init_timepulse(void)
@ -1909,7 +1948,7 @@ int board_late_init(void)
#endif
init_sim_mux();
init_gsm();
init_gnss();
init_gnss(RESET_REASON_SHM_LOCATION);
init_timepulse();
/*