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Message-ID: <aGf1Rjy7WLEuNGme@p14s>
Date: Fri, 4 Jul 2025 09:37:42 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: linux@...linux.org.uk, gregkh@...uxfoundation.org,
david.m.ertman@...el.com, ira.weiny@...el.com, leon@...nel.org,
rafael@...nel.org, dakr@...nel.org, len.brown@...el.com,
pavel@...nel.org, andersson@...nel.org, mturquette@...libre.com,
sboyd@...nel.org, maarten.lankhorst@...ux.intel.com,
mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
simona@...ll.ch, wsa+renesas@...g-engineering.com,
ulf.hansson@...aro.org, vkoul@...nel.org,
yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
broonie@...nel.org, robh@...nel.org, jirislaby@...nel.org,
saravanak@...gle.com, jic23@...nel.org, dmitry.torokhov@...il.com,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
linux-i2c@...r.kernel.org, linux-mmc@...r.kernel.org,
linux-remoteproc@...r.kernel.org, linux-sound@...r.kernel.org,
linux-spi@...r.kernel.org, linux-serial@...r.kernel.org,
bhelgaas@...gle.com, geert@...ux-m68k.org,
linux-iio@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
fabrizio.castro.jz@...esas.com,
Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v5 1/3] PM: domains: Add flags to specify power on
attach/detach
On Thu, Jul 03, 2025 at 02:27:06PM +0300, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> Calling dev_pm_domain_attach()/dev_pm_domain_detach() in bus driver
> probe/remove functions can affect system behavior when the drivers attached
> to the bus use devres-managed resources. Since devres actions may need to
> access device registers, calling dev_pm_domain_detach() too early, i.e.,
> before these actions complete, can cause failures on some systems. One such
> example is Renesas RZ/G3S SoC-based platforms.
>
> If the device clocks are managed via PM domains, invoking
> dev_pm_domain_detach() in the bus driver's remove function removes the
> device's clocks from the PM domain, preventing any subsequent
> pm_runtime_resume*() calls from enabling those clocks.
>
> The second argument of dev_pm_domain_attach() specifies whether the PM
> domain should be powered on during attachment. Likewise, the second
> argument of dev_pm_domain_detach() indicates whether the domain should be
> powered off during detachment.
>
> Upcoming commits address the issue described above (initially for the
> platform bus only) by deferring the call to dev_pm_domain_detach() until
> after devres_release_all() in device_unbind_cleanup(). The detach_power_off
> field in struct dev_pm_info stores the detach power off info from the
> second argument of dev_pm_domain_attach().
>
> Because there are cases where the device's PM domain power-on/off behavior
> must be conditional (e.g., in i2c_device_probe()), the patch introduces
> PD_FLAG_ATTACH_POWER_ON and PD_FLAG_DETACH_POWER_OFF flags to be passed to
> dev_pm_domain_attach().
>
> Finally, dev_pm_domain_attach() and its users are updated to use the newly
> introduced PD_FLAG_ATTACH_POWER_ON and PD_FLAG_DETACH_POWER_OFF macros.
>
> This is a preparatory commit.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>
> Changes in v5:
> - none; this patch is new
>
> drivers/amba/bus.c | 4 ++--
> drivers/base/auxiliary.c | 2 +-
> drivers/base/platform.c | 2 +-
> drivers/base/power/common.c | 6 +++---
> drivers/clk/qcom/apcs-sdx55.c | 2 +-
> drivers/gpu/drm/display/drm_dp_aux_bus.c | 2 +-
> drivers/i2c/i2c-core-base.c | 2 +-
> drivers/mmc/core/sdio_bus.c | 2 +-
> drivers/rpmsg/rpmsg_core.c | 2 +-
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> drivers/soundwire/bus_type.c | 2 +-
> drivers/spi/spi.c | 2 +-
> drivers/tty/serdev/core.c | 2 +-
> include/linux/pm_domain.h | 10 ++++++++--
> 13 files changed, 23 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
> index 71482d639a6d..74e34a07ef72 100644
> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -138,7 +138,7 @@ static int amba_read_periphid(struct amba_device *dev)
> void __iomem *tmp;
> int i, ret;
>
> - ret = dev_pm_domain_attach(&dev->dev, true);
> + ret = dev_pm_domain_attach(&dev->dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret) {
> dev_dbg(&dev->dev, "can't get PM domain: %d\n", ret);
> goto err_out;
> @@ -291,7 +291,7 @@ static int amba_probe(struct device *dev)
> if (ret < 0)
> break;
>
> - ret = dev_pm_domain_attach(dev, true);
> + ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret)
> break;
>
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index dba7c8e13a53..44cd3f85b659 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -217,7 +217,7 @@ static int auxiliary_bus_probe(struct device *dev)
> struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
> int ret;
>
> - ret = dev_pm_domain_attach(dev, true);
> + ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret) {
> dev_warn(dev, "Failed to attach to PM Domain : %d\n", ret);
> return ret;
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 075ec1d1b73a..df1ec34fdf56 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -1396,7 +1396,7 @@ static int platform_probe(struct device *_dev)
> if (ret < 0)
> return ret;
>
> - ret = dev_pm_domain_attach(_dev, true);
> + ret = dev_pm_domain_attach(_dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret)
> goto out;
>
> diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
> index 781968a128ff..fecb85fa85ac 100644
> --- a/drivers/base/power/common.c
> +++ b/drivers/base/power/common.c
> @@ -83,7 +83,7 @@ EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
> /**
> * dev_pm_domain_attach - Attach a device to its PM domain.
> * @dev: Device to attach.
> - * @power_on: Used to indicate whether we should power on the device.
> + * @flags: indicate whether we should power on/off the device on attach/detach
> *
> * The @dev may only be attached to a single PM domain. By iterating through
> * the available alternatives we try to find a valid PM domain for the device.
> @@ -100,14 +100,14 @@ EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
> * Returns 0 on successfully attached PM domain, or when it is found that the
> * device doesn't need a PM domain, else a negative error code.
> */
> -int dev_pm_domain_attach(struct device *dev, bool power_on)
> +int dev_pm_domain_attach(struct device *dev, u32 flags)
> {
> int ret;
>
> if (dev->pm_domain)
> return 0;
>
> - ret = acpi_dev_pm_attach(dev, power_on);
> + ret = acpi_dev_pm_attach(dev, !!(flags & PD_FLAG_ATTACH_POWER_ON));
> if (!ret)
> ret = genpd_dev_pm_attach(dev);
>
> diff --git a/drivers/clk/qcom/apcs-sdx55.c b/drivers/clk/qcom/apcs-sdx55.c
> index 3ba01622d8f0..90dd1f1855c2 100644
> --- a/drivers/clk/qcom/apcs-sdx55.c
> +++ b/drivers/clk/qcom/apcs-sdx55.c
> @@ -111,7 +111,7 @@ static int qcom_apcs_sdx55_clk_probe(struct platform_device *pdev)
> * driver, there seems to be no better place to do this. So do it here!
> */
> cpu_dev = get_cpu_device(0);
> - ret = dev_pm_domain_attach(cpu_dev, true);
> + ret = dev_pm_domain_attach(cpu_dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret) {
> dev_err_probe(dev, ret, "can't get PM domain: %d\n", ret);
> goto err;
> diff --git a/drivers/gpu/drm/display/drm_dp_aux_bus.c b/drivers/gpu/drm/display/drm_dp_aux_bus.c
> index 7b9afcf48836..2d279e82922f 100644
> --- a/drivers/gpu/drm/display/drm_dp_aux_bus.c
> +++ b/drivers/gpu/drm/display/drm_dp_aux_bus.c
> @@ -58,7 +58,7 @@ static int dp_aux_ep_probe(struct device *dev)
> container_of(aux_ep, struct dp_aux_ep_device_with_data, aux_ep);
> int ret;
>
> - ret = dev_pm_domain_attach(dev, true);
> + ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret)
> return dev_err_probe(dev, ret, "Failed to attach to PM Domain\n");
>
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 2ad2b1838f0f..38eabf1173da 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -573,7 +573,7 @@ static int i2c_device_probe(struct device *dev)
> goto err_clear_wakeup_irq;
>
> do_power_on = !i2c_acpi_waive_d0_probe(dev);
> - status = dev_pm_domain_attach(&client->dev, do_power_on);
> + status = dev_pm_domain_attach(&client->dev, do_power_on ? PD_FLAG_ATTACH_POWER_ON : 0);
> if (status)
> goto err_clear_wakeup_irq;
>
> diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
> index b66b637e2d57..656601754966 100644
> --- a/drivers/mmc/core/sdio_bus.c
> +++ b/drivers/mmc/core/sdio_bus.c
> @@ -161,7 +161,7 @@ static int sdio_bus_probe(struct device *dev)
> if (!id)
> return -ENODEV;
>
> - ret = dev_pm_domain_attach(dev, false);
> + ret = dev_pm_domain_attach(dev, 0);
> if (ret)
> return ret;
>
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index 6ee36adcbdba..bece5e635ee9 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -479,7 +479,7 @@ static int rpmsg_dev_probe(struct device *dev)
> struct rpmsg_endpoint *ept = NULL;
> int err;
>
> - err = dev_pm_domain_attach(dev, true);
> + err = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (err)
> goto out;
>
> diff --git a/drivers/soundwire/bus_type.c b/drivers/soundwire/bus_type.c
> index 75d6f16efced..bc1e653080d9 100644
> --- a/drivers/soundwire/bus_type.c
> +++ b/drivers/soundwire/bus_type.c
> @@ -101,7 +101,7 @@ static int sdw_drv_probe(struct device *dev)
> /*
> * attach to power domain but don't turn on (last arg)
> */
> - ret = dev_pm_domain_attach(dev, false);
> + ret = dev_pm_domain_attach(dev, 0);
> if (ret)
> return ret;
>
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 1bc0fdbb1bd7..8200b47b2295 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -427,7 +427,7 @@ static int spi_probe(struct device *dev)
> if (spi->irq < 0)
> spi->irq = 0;
>
> - ret = dev_pm_domain_attach(dev, true);
> + ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret)
> return ret;
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index 0213381fa358..d16c207a1a9b 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -399,7 +399,7 @@ static int serdev_drv_probe(struct device *dev)
> const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
> int ret;
>
> - ret = dev_pm_domain_attach(dev, true);
> + ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> if (ret)
> return ret;
>
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index 0b18160901a2..62a35a78ce9b 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -36,10 +36,16 @@
> * isn't specified, the index just follows the
> * index for the attached PM domain.
> *
> + * PD_FLAG_ATTACH_POWER_ON: Power on the domain during attach.
> + *
> + * PD_FLAG_DETACH_POWER_OFF: Power off the domain during detach.
> + *
> */
> #define PD_FLAG_NO_DEV_LINK BIT(0)
> #define PD_FLAG_DEV_LINK_ON BIT(1)
> #define PD_FLAG_REQUIRED_OPP BIT(2)
> +#define PD_FLAG_ATTACH_POWER_ON BIT(3)
> +#define PD_FLAG_DETACH_POWER_OFF BIT(4)
>
> struct dev_pm_domain_attach_data {
> const char * const *pd_names;
> @@ -501,7 +507,7 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
> #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
>
> #ifdef CONFIG_PM
> -int dev_pm_domain_attach(struct device *dev, bool power_on);
> +int dev_pm_domain_attach(struct device *dev, u32 flags);
> struct device *dev_pm_domain_attach_by_id(struct device *dev,
> unsigned int index);
> struct device *dev_pm_domain_attach_by_name(struct device *dev,
> @@ -518,7 +524,7 @@ int dev_pm_domain_start(struct device *dev);
> void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
> int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
> #else
> -static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
> +static inline int dev_pm_domain_attach(struct device *dev, u32 flags)
> {
> return 0;
> }
> --
> 2.43.0
>
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