Re: [PATCH v3 3/5] pmdomain: core: Add a genpd config to support unknown initial status

[Dhruva G <goledhruva@gmail.com>]

On 07-09-2026 16:46, Ulf Hansson wrote:
> It's not always possible for a genpd provider to know the initial status
> for its corresponding PM domain(s). To register the PM domain in a safe
> state, the genpd provider driver may therefore have to initialize the
> genpd's status to be powered off, as a way to prevent the PM domain from
> being used when it actually could be powered off.
> 
> In these cases we may end up to power on a PM domain through the genpd
> subsystem, while from the HW point of view it may already be powered on.
> Under these circumstances, it may also be required to keep the PM domain
> powered on until all the consumer devices have been probed. In other words,
> until the ->sync_state() callback for the genpd provider in question have
> been called.
> 
> To support this behaviour for a genpd provider, let's introduce a new genpd
> configuration, GENPD_FLAG_POWER_UNKNOWN.
> 
> Reported-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
> Link: https://lore.kernel.org/all/20260811-domain_off_ss3-v1-0-6a0a0fc023f5@oss.qualcomm.com/
> Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
> Tested-by: Yuanfang Zhang <yuanfang.zhang@oss.qualcomm.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@oss.qualcomm.com>
> ---

Reviewed-by: Dhruva Gole <goledhruva@gmail.com>

> 
> Changes in v3:
> 	- None.
> Changes in v2:
> 	- Rename the config to GENPD_FLAG_POWER_UNKNOWN.
> ---
>  drivers/pmdomain/core.c   | 6 +++++-
>  include/linux/pm_domain.h | 9 +++++++++
>  2 files changed, 14 insertions(+), 1 deletion(-)
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