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

[Johan Hovold <johan@kernel.org>]

On Wed, Jun 18, 2025 at 10:52:27AM +0200, 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@suse.de>
> > > Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.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).

Scratch that bit about failing to resume, it's just a warning that's
new.

> > [root@sc8280xp-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?
> 
> > [   39.964396] Hardware name: Qualcomm QRD, BIOS 6.0.230525.BOOT.MXF.1.1.c1-00114-MAKENA-1 05/25/2023

Johan