From: Marcin Ślusarz <mslusarz@xxxxxxxxx>
If I don't connect to any Wifi network, after around 10 minutes, the device
hangs with endless spamming of:
rtw_8821cu 1-1:1.2: rtw_usb_reg_sec: reg 0x4e0, usb write 1 fail, status: -71
killing both Wifi and Bluetooth part of the device.
On arm, just leaving the wifi device unconnected kills it in up to 20 minutes.
If I keep restarting wpa_supplicant I can trigger it within a minute.
Looping "ifconfig wlan0 down; ifconfig wlan0 up" also triggers it within a minute.
On x86_64 system the only way I could trigger this was via ifconfig loop,
but it took 3 hours and 20 minutes to do it.
The only thing that can "fix" the device is replugging it.
I found out that the reason for those hangs is a power-off+on sequence that's
triggered by the above steps.
Disabling power-off for that chip "fixes" the issue. The patches below
implement that, but I'm not seriously proposing them for merging.
Marcin Ślusarz (2):
wifi: rtw88: use RTW_FLAG_RUNNING for deciding whether to enter/leave
IPS
wifi: rtw88: disable power offs for 8821C
drivers/net/wireless/realtek/rtw88/main.c | 14 ++++++++------
drivers/net/wireless/realtek/rtw88/ps.c | 4 ++--
2 files changed, 10 insertions(+), 8 deletions(-)
--
2.25.1
