Hi Viacheslav, On Wed, Jan 17, 2024 at 10:48 AM Viacheslav <adeep@xxxxxxxxx> wrote: [...] > > 3) Has anybody tried AP mode with rtw88 on a (supported) USB chipset? > > If my thought (from #2) is correct then AP mode would show the same > > problems there. > > I have USB RTL8821CU. It works in AP mode: Thank you - this helps a lot as it narrows down the problem a lot! If RTL8821CU works in AP mode the problem must be one of: - a bug in sdio.c (in my opinion this is the most likely cause - starting point: rtw_sdio_write_data_rsvd_page()) - some missing bits that are only SDIO relevant (in other words: code that hasn't made it from the downstream driver into rtw88 yet) - chipset specific differences (RTL8821C vs RTL8822C) - a bug in the existing code that only affects SDIO cards (but doesn't affect PCI / USB chips) - a combination of any of those issues I won't have time to look into this any further before the weekend. Once I have more findings I'll let you know. [...] > > 4) Viacheslav, I think you previously mentioned that you did a bit of > > work with the downstream driver. > > It would be awesome if you could also take a look at the rtw88 and > > downstream driver code and start comparing them (logic that's > > different or completely missing from rtw88 is suspicious). > > > > I made some minor fixes to restore functionality after kernel updates. > But in this case, I will need help to understand where and how to start > figuring this out. The last rtw88 sdio bug fixes also only required changing only a few lines each. As always: the tricky part is finding out what to change (without breaking something else) :-) > Moreover, we've encountered another problem: after two or three days the > client WiFi connection stops working, the network interface loses its > DHCP address, and consequently nothing else works. Can you please confirm (to avoid any misunderstanding) that: - this is in STA mode (meaning: RTL8822CS is connected to another AP) - "loses it's DHCP address" means traffic stops flowing, even DHCP renew is not working anymore - (does restarting the interface: ip link set down ...; ip link set up ... work?) Best regards, Martin
