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 --- board/compulab/cm_t43/spl.c | 15 +++++++++++++++ include/configs/cm_t43.h | 2 ++ 2 files changed, 17 insertions(+)
diff --git a/board/compulab/cm_t43/spl.c b/board/compulab/cm_t43/spl.c index 520de24..b7d118e 100644 --- a/board/compulab/cm_t43/spl.c +++ b/board/compulab/cm_t43/spl.c @@ -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; diff --git a/include/configs/cm_t43.h b/include/configs/cm_t43.h index 3bc3336..329a5ea 100644 --- a/include/configs/cm_t43.h +++ b/include/configs/cm_t43.h @@ -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 */