linux-kernel - Re: [PATCH ath-next v3 5/6] wifi: ath11k: choose default PM policy for hibernation

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Message-ID: <aFKKZtbTIesVYgJK@hovoldconsulting.com>
Date: Wed, 18 Jun 2025 11:44:06 +0200
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Baochen Qiang <quic_bqiang@...cinc.com>,
	Johannes Berg <johannes@...solutions.net>,
	Jeff Johnson <jjohnson@...nel.org>, linux-wireless@...r.kernel.org,
	ath11k@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>,
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
	Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH ath-next v3 5/6] wifi: ath11k: choose default PM policy
 for hibernation

On Wed, Jun 18, 2025 at 11:18:14AM +0200, Konrad Dybcio wrote:
> On 6/18/25 10:52 AM, Johan Hovold wrote:
> > On Wed, Jun 18, 2025 at 02:15:04AM +0200, Konrad Dybcio wrote:
> >> On 3/28/25 6:32 AM, Baochen Qiang wrote:
> >>> Now WoWLAN mode is chosen for those machines listed in the quirk table.
> >>> This works for suspend (S3) but breaks for hibernation (S4), because
> >>> WoWLAN mode requires WLAN power to be sustained, which is not the case
> >>> during hibernation. For hibernation, the default mode should be used.
> >>>
> >>> Register a PM notifier with which kernel can notify us of the actual PM
> >>> operation: if system is going to suspend, the original PM policy is
> >>> honored; while if it is hibernation, overwrite it with default policy.
> >>>
> >>> To summarize: for suspend (S3), WoWLAN mode is chosen for machines listed
> >>> in the quirk table, non-WoWLAN mode for others; for hibernation (S4),
> >>> non-WoWLAN mode is chosen for all.
> >>>
> >>> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> >>>
> >>> Tested-by: Takashi Iwai <tiwai@...e.de>
> >>> Signed-off-by: Baochen Qiang <quic_bqiang@...cinc.com>
> >>> ---
> >>
> >> I've bisected the following splat to this patch, still happening on
> >> linux-next/master, WCN6855 + SC8280XP CRD, 100% reproducibility 
> > 
> > WFIW, I'm not seeing this with 6.16-rc2 (which has this patch) on either
> > the X13s or sc8280xp-crd (ath11k now fails to resume on the latter
> > because of missing regulatory data, but that appears to be a separate
> > regression).
> 
> Do you have CONFIG_DEBUG_NOTIFIERS?

Nope. Would have been useful to mention in your report.

But I'm not seeing the warning with 6.16-rc2 with that option enabled
either.

> >> [root@...280xp-crd ~]# echo mem > /sys/power/state 
> >> [   20.267830] fb0: Framebuffer is not in virtual address space.
> >> [   39.863070] PM: suspend entry (s2idle)
> >> [   39.908067] Filesystems sync: 0.035 seconds
> >> [   39.934453] ------------[ cut here ]------------
> >> [   39.939259] Invalid notifier called!
> >> [   39.939268] WARNING: CPU: 5 PID: 513 at kernel/notifier.c:79 notifier_call_chain+0x84/0x1a4
> >> [   39.951566] Modules linked in:
> >> [   39.954732] CPU: 5 UID: 0 PID: 513 Comm: bash Not tainted 6.14.0-rc4longbois-01215-g32d93b51bc7e #12177
> > 
> > 6.14?
> 
> g show 32d93b51bc7e2e557771abe4a88da69c609e3d52:Makefile | head
> 
> # SPDX-License-Identifier: GPL-2.0
> VERSION = 6
> PATCHLEVEL = 14
> SUBLEVEL = 0
> EXTRAVERSION = -rc4
> 
> it's been in the tree for a while

Ah, maybe in linux-next, it was only merged to mainline for 6.16-rc1.

Johan