On Friday, April 06, 2012, Marek Szyprowski wrote:
> Some bootloaders disable power domains on boot and the platform startup
> code registers them in the 'disabled' state. Current gen_pd code assumed
> that the devices can be registered only to the power domain which is in
> 'enabled' state and these devices are active at the time of the
> registration. This is not correct in our case. This patch lets drivers
> to be registered into 'disabled' power domains and finally solves
> mysterious freezes and lack of resume/suspend calls on Samsung Exynos4
> NURI and UniversalC210 platforms.
>
> Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
> ---
> drivers/base/power/domain.c | 7 +------
> 1 files changed, 1 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 73ce9fb..05f5799f 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1211,11 +1211,6 @@ int __pm_genpd_add_device(struct generic_pm_domain
> *genpd, struct device *dev,
>
> genpd_acquire_lock(genpd);
>
> - if (genpd->status == GPD_STATE_POWER_OFF) {
> - ret = -EINVAL;
> - goto out;
> - }
> -
> if (genpd->prepared_count > 0) {
> ret = -EAGAIN;
> goto out;
> @@ -1239,7 +1234,7 @@ int __pm_genpd_add_device(struct generic_pm_domain
> *genpd, struct device *dev,
> dev_pm_get_subsys_data(dev);
> dev->power.subsys_data->domain_data = &gpd_data->base;
> gpd_data->base.dev = dev;
> - gpd_data->need_restore = false;
> + gpd_data->need_restore = true;
I think that should be:
+ gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF;
Otherwise, on the next domain power off the device's state won't be saved.
> list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
> if (td)
> gpd_data->td = *td;
>
Thanks,
Rafael
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