Rajendra Nayak <rnayak@xxxxxx> writes:
> Hi Kevin,
>
> <snip>..
>
>> > if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
>> > + if ((pwrdm_read_pwrst(pwrdm) > state) &&
>> > + (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
>> > + ret = pwrdm_set_next_pwrst(pwrdm, state);
>> > + pwrdm_set_lowpwrstchange(pwrdm);
>> > + pwrdm_wait_transition(pwrdm);
>> > + pwrdm_state_switch(pwrdm);
>> > + return ret;
>>
>> Personally, I'd prefer if this function flowed through better instead of
>> the early return in order to emphasize the common code.
>>
>> Rather than the return here, can you just set the low-power state change
>> bit here (and put the clkdm_wakeup + sleep_switch = 1 into the else
>> clause?
>>
>> Or, does the next state have to be set before the low-power state change
>> bit?
>
> Yes, that sequencing is needed.
>
>>
>> Basically, what I'm getting at is this should be a single function with
>> common flow. The conditional code based on low-power state change
>> should be isolated instead of having a special path.
>
> I get your point. See if the below approach looks better.
> If it looks fine, I'll do some more testing (currently only tested
> on OMAP4430sdp) and repost the 2 patches.
Yes, this approach leads to better readability IMO.
Thanks,
Kevin
> From 5d206ba908071edafae6c044bd3ef6ad8a9c32e7 Mon Sep 17 00:00:00 2001
> From: Rajendra Nayak <rnayak@xxxxxx>
> Date: Thu, 25 Nov 2010 14:26:51 +0530
> Subject: [PATCH 1/5] OMAP4: PM: Use the low-power state change feature on
> OMAP4
>
> For pwrdm's which support LOWPOWERSTATECHANGE, do not try waking
> up the domain to put it back to deeper sleep state.
>
> Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
> Acked-by: Benoit Cousson <b-cousson@xxxxxx>
> ---
> arch/arm/mach-omap2/pm.c | 28 ++++++++++++++++++++++------
> 1 file changed, 22 insertions(+), 6 deletions(-)
>
> Index: linux/arch/arm/mach-omap2/pm.c
> ===================================================================
> --- linux.orig/arch/arm/mach-omap2/pm.c 2010-12-15 17:29:42.361228780
> +0530
> +++ linux/arch/arm/mach-omap2/pm.c 2010-12-15 20:19:48.321228780
> +0530
> @@ -89,6 +89,10 @@
> }
> }
>
> +/* Types of sleep_switch used in omap_set_pwrdm_state */
> +#define FORCEWAKEUP_SWITCH 0
> +#define LOWPOWERSTATE_SWITCH 1
> +
> /*
> * This sets pwrdm state (other than mpu & core. Currently only ON &
> * RET are supported. Function is assuming that clkdm doesn't have
> @@ -114,9 +118,14 @@
> return ret;
>
> if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
> - omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
> - sleep_switch = 1;
> - pwrdm_wait_transition(pwrdm);
> + if ((pwrdm_read_pwrst(pwrdm) > state) &&
> + (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
> + sleep_switch = LOWPOWERSTATE_SWITCH;
> + } else {
> + omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
> + pwrdm_wait_transition(pwrdm);
> + sleep_switch = FORCEWAKEUP_SWITCH;
> + }
> }
>
> ret = pwrdm_set_next_pwrst(pwrdm, state);
> @@ -126,12 +135,19 @@
> goto err;
> }
>
> - if (sleep_switch) {
> + switch (sleep_switch) {
> + case FORCEWAKEUP_SWITCH:
> omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
> - pwrdm_wait_transition(pwrdm);
> - pwrdm_state_switch(pwrdm);
> + break;
> + case LOWPOWERSTATE_SWITCH:
> + pwrdm_set_lowpwrstchange(pwrdm);
> + break;
> + default:
> + return ret;
> }
>
> + pwrdm_wait_transition(pwrdm);
> + pwrdm_state_switch(pwrdm);
> err:
> return ret;
> }
>
>
>>
>> Kevin
>>
>> > + }
>> > omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
>> > sleep_switch = 1;
>> > pwrdm_wait_transition(pwrdm);
--
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