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Wysocki" , Peng Fan Subject: [PATCH v7 1/3] pmdomain: core: introduce dev_pm_genpd_is_on() Date: Sun, 29 Jun 2025 14:25:10 -0300 Message-Id: <20250629172512.14857-2-hiagofranco@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250629172512.14857-1-hiagofranco@gmail.com> References: <20250629172512.14857-1-hiagofranco@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Hiago De Franco This helper function returns the current power status of a given generic power domain. As example, remoteproc/imx_rproc.c can now use this function to check the power status of the remote core to properly set "attached" or "offline" modes. Suggested-by: Ulf Hansson Reviewed-by: Bjorn Andersson Reviewed-by: Peng Fan Signed-off-by: Hiago De Franco --- v6 -> v7: - Added Peng reviewed-by. v5 -> v6: - Added Bjorn reviewed-by. v4 -> v5: - s/dev_pm_genpd_is_on/dev_pm_genpd_is_on()/ in function description. - Updated function description to be explicit the function reflects the current power status and that this might change after the function returns, especially if the genpd is shared. v3 -> v4: - New patch. --- drivers/pmdomain/core.c | 33 +++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 6 ++++++ 2 files changed, 39 insertions(+) diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index ff5c7f2b69ce..2f387e15cb75 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -758,6 +758,39 @@ int dev_pm_genpd_rpm_always_on(struct device *dev, boo= l on) } EXPORT_SYMBOL_GPL(dev_pm_genpd_rpm_always_on); =20 +/** + * dev_pm_genpd_is_on() - Get device's current power domain status + * + * @dev: Device to get the current power status + * + * This function checks whether the generic power domain associated with t= he + * given device is on or not by verifying if genpd_status_on equals + * GENPD_STATE_ON. + * + * Note: this function returns the power status of the genpd at the time o= f the + * call. The power status may change after due to activity from other devi= ces + * sharing the same genpd. Therefore, this information should not be relie= d for + * long-term decisions about the device power state. + * + * Return: 'true' if the device's power domain is on, 'false' otherwise. + */ +bool dev_pm_genpd_is_on(struct device *dev) +{ + struct generic_pm_domain *genpd; + bool is_on; + + genpd =3D dev_to_genpd_safe(dev); + if (!genpd) + return false; + + genpd_lock(genpd); + is_on =3D genpd_status_on(genpd); + genpd_unlock(genpd); + + return is_on; +} +EXPORT_SYMBOL_GPL(dev_pm_genpd_is_on); + /** * pm_genpd_inc_rejected() - Adjust the rejected/usage counts for an idle-= state. * diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 0b18160901a2..c12580b6579b 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -301,6 +301,7 @@ void dev_pm_genpd_synced_poweroff(struct device *dev); int dev_pm_genpd_set_hwmode(struct device *dev, bool enable); bool dev_pm_genpd_get_hwmode(struct device *dev); int dev_pm_genpd_rpm_always_on(struct device *dev, bool on); +bool dev_pm_genpd_is_on(struct device *dev); =20 extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor pm_domain_always_on_gov; @@ -393,6 +394,11 @@ static inline int dev_pm_genpd_rpm_always_on(struct de= vice *dev, bool on) return -EOPNOTSUPP; } =20 +static inline bool dev_pm_genpd_is_on(struct device *dev) +{ + return false; +} + #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) #endif --=20 2.39.5