RE: [BUG] wifi: rtw88: Hard system freeze on RTL8821CE when power_save is enabled (LPS/ASPM conflict)

[Ping-Ke Shih]

LB F <goainwo@xxxxxxxxx> wrote:
> Ping-Ke Shih <pkshih@xxxxxxxxxxx> wrote:
> > Not sure what hardware get wrong. Let's validate rate when reading
> > from hardware.
> 
> Hi Ping-Ke,
> 
> One additional observation while monitoring logs with your rate
> validation patch installed.
> 
> During normal usage with Wi-Fi connected and a Bluetooth A2DP device
> connecting to the system, the following message appeared in dmesg:
> 
>   [180.420000] rtw_8821ce 0000:13:00.0: unused phy status page (11)
> 
> Looking at rtw_rx_fill_phy_info() in rx.c, this message is emitted
> when the firmware sends a PHY status report with a page number that
> the driver does not recognize. In this case page 11 appeared at the
> moment the Bluetooth device was establishing its connection.

It seems like hardware reports incorrect about the PHY status, which
only 0 or 1 is expected. I don't know how it could be. Maybe, we
can ignore this message, or change it to debug level if it appears
frequently and you don't want to see it.

> 
> We have not observed any stability issues or connectivity drops
> associated with this message -- the driver appears to handle it
> gracefully by ignoring it. We are not sure whether this is related
> to the rate=0x65 issue or is simply a separate artifact of BT/Wi-Fi
> coexistence on this chip. We wanted to mention it in case it is
> useful context.

Two messages look like hardware goes weird. The report values become
unpredictable. Maybe we need more validation.... However, driver
will become very dirty since I can't conclude a single rule to
address them.

Ping-Ke