Re: [PATCH v7 1/3] power-domain: add power domain drivers for Rockchip platform

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Jinkun,

On Fri, Oct 24, 2014 at 12:29:19AM -0700, jinkun.hong wrote:
> +static int rockchip_pd_power(struct rockchip_domain *pd, bool power_on)
> +{
> +	int ret = 0;
> +	struct rockchip_dev_entry *de;
> +
> +	mutex_lock(&pd->dev_lock);
> +	/* no clk, set power domain will fail */
> +	if (list_empty(&pd->dev_list)) {
> +		pr_err("%s: no devices in %s power domain\n", __func__,
> +			pd->base.name);
> +		goto out;
> +	}
> +
> +	list_for_each_entry(de, &pd->dev_list, node) {
> +		pm_clk_resume(de->dev);
> +	}
> +
> +	ret = rockchip_pmu_set_power_domain(pd, power_on);
> +
> +	list_for_each_entry(de, &pd->dev_list, node) {
> +		pm_clk_suspend(de->dev);
> +	}
> +out:
> +	mutex_unlock(&pd->dev_lock);
> +	return ret;
> +}

For my education, could you please tell me why we need to enable all
clocks of all devices in a power domain when we are talking to the PMU
and then turn them immediately off? Would not we want to enable clocks
in start()) callbacks, like Ulf mentioned?

Thanks.

-- 
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux