Tero Kristo <tero.kri...@nokia.com> writes:
> From: Tero Kristo <tero.kri...@nokia.com>
>
> Added omap3_pwrdm_set_next_pwrst and omap3_pwrdm_read_next_pwrst. These
> functions add support for INACTIVE and ON states to the standard OMAP
> powerdomain functions, and add caching logic for the next state. These
> functions are used in subsequent patches to simplify the logic of the idle
> loop.
>
> Signed-off-by: Tero Kristo <tero.kri...@nokia.com>
> ---
> arch/arm/mach-omap2/pm.h | 2 +
> arch/arm/mach-omap2/pm34xx.c | 60
> +++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 61 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
> index 75aa685..1d9a740 100644
> --- a/arch/arm/mach-omap2/pm.h
> +++ b/arch/arm/mach-omap2/pm.h
> @@ -67,6 +67,8 @@ static inline void omap3_pm_init_vc(struct prm_setup_vc
> *setup_vc)
>
> extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
> extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
> +extern int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
> +extern int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
>
> extern u32 wakeup_timer_seconds;
> extern struct omap_dm_timer *gptimer_wakeup;
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 1359ec9..f20d3d8 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -576,6 +576,64 @@ int omap3_can_sleep(void)
> return 1;
> }
>
> +struct powerdomain_data {
> + u8 next_state;
> + u8 init_done;
> +};
> +
> +static struct powerdomain_data mpu_pwrdm_data;
> +static struct powerdomain_data core_pwrdm_data;
> +static struct powerdomain_data neon_pwrdm_data;
> +
> +static struct powerdomain_data *get_pwrdm_data(struct powerdomain *pwrdm)
> +{
> + if (pwrdm == mpu_pwrdm)
> + return &mpu_pwrdm_data;
> + else if (pwrdm == core_pwrdm)
> + return &core_pwrdm_data;
> + else if (pwrdm == neon_pwrdm)
> + return &neon_pwrdm_data;
> + return NULL;
> +}
> +
> +int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
I think this func should be documented along the lines of the changelog.
It should describe the caching and the fact that 'INACTIVE' is a state
that can be read, but not written.
> +{
> + struct powerdomain_data *data = get_pwrdm_data(pwrdm);
> + u8 prg_pwrst;
> +
> + if (!data)
> + return pwrdm_set_next_pwrst(pwrdm, pwrst);
> +
> + if (!data->init_done)
> + data->init_done = 1;
Not sure I follow the purpose of the 'init_done' flag here, but I'm having
an averse reaction to it.
> + else if (data->next_state == pwrst)
> + return 0;
> +
> + if (pwrst == PWRDM_POWER_INACTIVE)
> + prg_pwrst = PWRDM_POWER_ON;
> + else
> + prg_pwrst = pwrst;
> +
> + pwrdm_set_next_pwrst(pwrdm, prg_pwrst);
> +
> + if (pwrst == PWRDM_POWER_ON)
> + omap2_clkdm_deny_idle(pwrdm->pwrdm_clkdms[0]);
> + else
> + omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
> +
> + data->next_state = pwrst;
> + return 0;
> +}
> +
> +int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
> +{
> + struct powerdomain_data *data = get_pwrdm_data(pwrdm);
> +
> + if (!data || !data->init_done)
> + return pwrdm_read_next_pwrst(pwrdm);
> + return data->next_state;
> +}
> +
> /* This sets pwrdm state (other than mpu & core. Currently only ON &
> * RET are supported. Function is assuming that clkdm doesn't have
> * hw_sup mode enabled. */
> @@ -604,7 +662,7 @@ int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
> pwrdm_wait_transition(pwrdm);
> }
>
> - ret = pwrdm_set_next_pwrst(pwrdm, state);
> + ret = omap3_pwrdm_set_next_pwrst(pwrdm, state);
> if (ret) {
> printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
> pwrdm->name);
> --
> 1.5.4.3
>
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