linux-kernel - Re: [PATCH v4 0/5] pmdomain: core: Introduce device_set_out_band

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Message-ID: <CAPDyKFqQgS9j4uGkTL_taPTL96su1tqpyoek1cpZgTiaaBMpCA@mail.gmail.com>
Date: Tue, 23 Sep 2025 12:07:02 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Peng Fan <peng.fan@....com>
Cc: Pavel Machek <pavel@...nel.org>, Len Brown <lenb@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Danilo Krummrich <dakr@...nel.org>, 
	Peter Chen <peter.chen@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, Thinh Nguyen <Thinh.Nguyen@...opsys.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, Xu Yang <xu.yang_2@....com>
Subject: Re: [PATCH v4 0/5] pmdomain: core: Introduce device_set_out_band_wakeup
 and use it in usb

On Mon, 22 Sept 2025 at 04:21, Peng Fan <peng.fan@....com> wrote:
>
> To i.MX95, USB2 and USB3 are in HSIOMIX domain, but there is always on logic
> to make USB2 and USB3 has wakeup capability when HSIOMIX power domain
> is in off state. So when in system-suspend state, USB2/USB3 could wakeup
> the system even the USB2/USB3 HSIOMIX power domain is turned off. This
> means USB2/USB3 has out-of-band wakeup capability to wakeup system from
> suspended state.
>
> Without this patchset, if USB2/USB3 are configured with wakeup enabled,
> the HSIOMIX power domain will not be turned off. This leads to more
> power consumed in system suspend state.
>
> This patchset introduces device_set_out_band_wakeup and
> device_out_band_wakeup two APIs to set out-of-band and query the flag.
> In genpd_finish_suspend, there is a check, if out-of-band is set,
> it will continue to turn off the power domain. In genpd resume flow,
> there is a similar check to turn on the power domain.
>
> Patch 1,2 introduces device_set_out_band_wakeup and
> device_out_band_wakeup
> Patch 3 and 4 are drivers changes to use device_out_band_wakeup
>
> More old discussions:
> https://lore.kernel.org/linux-pm/20250311083239.3336439-1-peng.fan@oss.nxp.com/
>
> This is pick up of [1]
> This V2 patchset
> - includes usb driver changes to give people a full picture on how it is used.
> - Rebased next-20250729 to resolve conflicts
>
> [1]https://lore.kernel.org/linux-pm/20250311083239.3336439-1-peng.fan@oss.nxp.com/
>
> Changes in v4:
> - Split device_set_out_band_wakeup API and pmdomain changes into patch 1
>   and 2 and clear the flag in device_prepare (from Ulf)
> - Add R-b in patch 2
> - Move the call of device_set_out_band_wakeup to system suspend
>   callback in patch 3 and 4. (from Ulf)
> - For patch 3,4, I still keep the Tags, since compared with V3, it is quite
>   small changes.
> - Link to v3: https://lore.kernel.org/r/20250902-pm-v3-0-ffadbb454cdc@nxp.com
>
> Changes in v3:
> - Add a new patch from Xu Yang to detach power domain for ci hdrc
> - Add A-b for patch 4
> - Link to v2: https://lore.kernel.org/r/20250801-pm-v2-0-97c8fb2a433c@nxp.com
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> Peng Fan (4):
>       PM: wakeup: Add out-of-band system wakeup support for devices
>       PM: domains: Allow power-off for out-of-band wakeup-capable devices
>       usb: chipidea: ci_hdrc_imx: Set out of band wakeup for i.MX95
>       usb: dwc3: imx8mp: Set out of band wakeup for i.MX95
>
> Xu Yang (1):
>       usb: chipidea: core: detach power domain for ci_hdrc platform device
>
>  drivers/base/power/main.c          |  1 +
>  drivers/pmdomain/core.c            |  6 ++++--
>  drivers/usb/chipidea/ci_hdrc_imx.c | 11 ++++++++++-
>  drivers/usb/chipidea/core.c        |  3 +++
>  drivers/usb/dwc3/dwc3-imx8mp.c     |  9 +++++++--
>  include/linux/pm.h                 |  1 +
>  include/linux/pm_wakeup.h          | 17 +++++++++++++++++
>  include/linux/usb/chipidea.h       |  1 +
>  8 files changed, 44 insertions(+), 5 deletions(-)
> ---
> base-commit: 8f7f8b1b3f4c613dd886f53f768f82816b41eaa3
> change-id: 20250919-pm-v4-1879568de500
>
> Best regards,
> --
> Peng Fan <peng.fan@....com>
>

Rafael, I intend to pick up this series via my pmdomain tree shortly,
unless you have some objections, of course.

Kind regards
Uffe