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SubjectRe: [PATCH RFC] davinci: poll for sleep completion in resume routine.
Manish,

On 1/31/2013 2:56 PM, Vishwanathrao Badarkhe, Manish wrote:
> As per OMAP-L138 TRM, Software must poll for
> SLEEPCOMPLETE bit until it is set to 1 before clearing
> SLEEPENABLE bit in DEEPSLEEP register in resume routine.
> Modifications are as per datasheet:
> http://www.ti.com/lit/ug/spruh77a/spruh77a.pdf
> See sections 10.10.2.2 and 11.5.21 for more detailed
> explanation.

Polling for SLEEPCOMPLETE is not required in RTC controlled wake-up
which is the mode currently supported (see section 10.10.2.1 of the
TRM). Polling for SLEEPCOMPLETE is required for external controlled
wake-up which to my knowledge has never been tested. If you have tested
this with external controlled wakep-up, then I can consider this patch.
Else, I would like to take it only after externally controlled wake-up
is fully tested/supported instead of taking bits and pieces.

Thanks,
Sekhar

>
> Tested on da850-evm.
>
> Signed-off-by: Vishwanathrao Badarkhe, Manish <manishv.b@ti.com>
> ---
> :100644 100644 d4e9316... 976f096... M arch/arm/mach-davinci/sleep.S
> arch/arm/mach-davinci/sleep.S | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/sleep.S b/arch/arm/mach-davinci/sleep.S
> index d4e9316..976f096 100644
> --- a/arch/arm/mach-davinci/sleep.S
> +++ b/arch/arm/mach-davinci/sleep.S
> @@ -35,6 +35,7 @@
> #define PLL_LOCK_CYCLES (PLL_LOCK_TIME * 25)
>
> #define DEEPSLEEP_SLEEPENABLE_BIT BIT(31)
> +#define DEEPSLEEP_SLEEPCOMPLETE_BIT BIT(30)
>
> .text
> /*
> @@ -110,6 +111,13 @@ ENTRY(davinci_cpu_suspend)
>
> /* Wake up from sleep */
>
> + /* wait for sleep complete */
> +sleep_complete:
> + ldr ip, [r4]
> + and ip, ip, #DEEPSLEEP_SLEEPCOMPLETE_BIT
> + cmp ip, #DEEPSLEEP_SLEEPCOMPLETE_BIT
> + bne sleep_complete
> +
> /* Clear sleep enable */
> ldr ip, [r4]
> bic ip, ip, #DEEPSLEEP_SLEEPENABLE_BIT
>


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