linux-kernel - RE: [Bug report] rtw89: 8852b: IO_PAGE_FAULTs with beacon filter feature enabled

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Message-ID: <419811cccd774d38b5a9c0bbcdf5dfbe@realtek.com>
Date: Thu, 8 May 2025 00:59:28 +0000
From: Ping-Ke Shih <pkshih@...ltek.com>
To: Fedor Pchelkin <boddah8794@...il.com>
CC: Bernie Huang <phhuang@...ltek.com>,
        "linux-wireless@...r.kernel.org"
	<linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [Bug report] rtw89: 8852b: IO_PAGE_FAULTs with beacon filter feature enabled

Fedor Pchelkin <boddah8794@...il.com> wrote:
> On Thu, 17. Apr 01:05, Ping-Ke Shih wrote:
> > Fedor Pchelkin <boddah8794@...il.com> wrote:
> > >
> > > On Wed, 16. Apr 00:49, Ping-Ke Shih wrote:
> > > > As bisection, can I summarize as below table?
> > > >
> > > >     d56c261e52           firmware             IO_PAGE_FAULT
> > > >    (CQM support)
> > > >   ---------------      -----------          -----------------
> > > >       o                 0.29.29.7                  yes
> > > >       o                 0.29.29.5                  no
> > > >       x                 0.29.29.7                  no
> > > >       x                 0.29.29.5                  no
> > > >
> > > > If this table is correct, we will check the beacon filter feature in firmware.
> > > >
> > >
> > > Yes, it correctly describes the situation. My suspicion currently falls on
> > > the beacon filter feature in firmware, too.
> >
> > Could you help to test when we have updated firmware?
> >
> 
> Hi,
> 
> Were you able to reproduce or track down the problem?

Yes, we have reproduced this problem, and we found sending firmware command
during deep PS mode will raise IO_PAGE_FAULT. With below setting to disable
deep PS mode, the symptom can disappear.

   rtw89_core.ko disable_ps_mode=y

Now we are arranging CAT-C equipment to capture signals in PCIE bus to see
what happens at that moment. 

One possible solution (workaround) is to avoid sending firmware commands
during deep PS mode, before we found out the root cause.