TI8148 power management

chaitanya godavarthi

Hi,

I have only initialized one UART as serial for console (using omap_serial_init_port) , and have not initialised any other UART on ti8148.

According to the TI8148 power estimation spread sheet, each UART instance will consume around 8mW of core power. But we observe that there is no decrease in the core current with only one UART enabled when compared to the core current measured with all the UARTs enabled.

Is this the correct way to disable the UARTs? Can anyone please tell what is meant by "Off" in the TI8148 power estimation spread sheet with respect to UART.

Thanks

Chaitanya

over 12 years ago

0 Viet Dinh over 12 years ago

TI__Genius 15310 points

Hi Chaitanya,

How do you turn off UART? Do you set the CM_ALWON_UART_x_CLKCTRL bit [1:0] to 0 according to TRM?

BR,

Viet

0 chaitanya godavarthi over 12 years ago in reply to Viet Dinh

Intellectual 260 points

Hi Viet,

Thats exactly what i am doing (CM_ALWON_UART_x_CLKCTRL bit [1:0] to 0). I am using the function call "omap_uart_disable_clocks" for that.

I have also tried to put the UART in smart idle mode by writing in to the SYSC register of UART module the following, but core current does not change.

SYSC.IDLEMODE --> smart idle

SYSC.ENAWAKEUP --> Wakeup capability is enabled

SYSC.AUTOIDLE --> Automatic interface clock-gating strategy

Thanks

Chaitanya

0 Viet Dinh over 12 years ago in reply to chaitanya godavarthi

TI__Genius 15310 points

Hi Chaitanya,

Let me check with power spread sheet owner then get back to you.

BR,

Viet

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TI8148 power management