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arm: am437x: cm-t43: set MPU and CORE voltages on boot

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During boot, U-Boot raises the CPU frequency but the CORE and MPU regulators
are not updated. This is not a problem in cold boot since the default values
that the pmic outputs are correct, but if Linux were to switch the module to a
low power OPP, the new voltage values will be retained after a reboot and the
module will likely hang once U-Boot raises the CPU frequency back up.

Set both CORE and MPU regulators to to 1.1V on boot.

Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Nikita Kiryanov 2016-02-19 19:19:49 +02:00 committed by Tom Rini
parent e038e2a89b
commit 43e568c4ae
2 changed files with 17 additions and 0 deletions
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15
board/compulab/cm_t43/spl.c
View file

@ -6,9 +6,13 @@
#include <common.h>
#include <spl.h>
#include <i2c.h>
#include <asm/arch/clock.h>
#include <asm/arch/ddr_defs.h>
#include <asm/gpio.h>
#include <power/pmic.h>
#include <power/tps65218.h>
#include "board.h"
DECLARE_GLOBAL_DATA_PTR;
@ -100,6 +104,17 @@ const struct dpll_params *get_dpll_per_params(void)
return &dpll_per;
}
void scale_vcores(void)
{
set_i2c_pin_mux();
i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
if (i2c_probe(TPS65218_CHIP_PM))
return;
tps65218_voltage_update(TPS65218_DCDC1, TPS65218_DCDC_VOLT_SEL_1100MV);
tps65218_voltage_update(TPS65218_DCDC2, TPS65218_DCDC_VOLT_SEL_1100MV);
}
void sdram_init(void)
{
unsigned long ram_size;

2
include/configs/cm_t43.h
View file

@ -167,5 +167,7 @@
#define CONFIG_SPL_SPI_SUPPORT
#define CONFIG_SPL_SPI_FLASH_SUPPORT
#define CONFIG_SPL_SPI_LOAD
#define CONFIG_SPL_I2C_SUPPORT
#define CONFIG_SPL_POWER_SUPPORT
#endif /* __CONFIG_CM_T43_H */