Wi-Fi Bluetooth for Linux Forum Discussions

Hi Infineon Team,

We are using CYW43455 WiFi chip on iMX8MMini processor with Android 11 OS.
We want to operate only on 2.4GHz band i.e should not connect to 5GHz APs.

How and where to do this change in code?

Thanks.

hi,

As title. I studied this thread.

https://community.infineon.com/t5/Wi-Fi-Bluetooth-for-Linux/is-there-a-cyw43438-driver-version-suitable-for-linux-kernel-3-10/td-p/283304

But how to deal this error message. Any proper way to fix this build error or just comment out and ignore this??

/home/mgkiller/aw-nm372sm/v5.4.18-backports/compat/backport-genetlink.c:290:44: warning: passing argument 2 of 'genl_register_ops' from incompatible pointer type [-Wincompatible-pointer-types]
err = genl_register_ops(&family->family, ops + i);

Austin

My setup:

- ARM host processor running 5.10 Linux. 

- Murata 1MW BT/Wi-Fi combo chip (BCM43455) over SDIO

- Wi-Fi firmware: version 7.45.249

- Using linux/hostapd patch sets from "cypress-fmac-v5.10.9-2022_0511"

The issue:

After removing the brcmfmac kernel module, Bluetooth performs very poorly (drops active connections, scan no longer detects devices, sco audio is extremely crackly if the connection does not drop, etc.). This is only observed if Wi-Fi was associated to an AP within 3 seconds of kernel module removal. Re-inserting the module always corrects the issue. 

Example steps to reproduce the issue:

- Start with brcmfmac modules loaded and associated to an AP, then run the following in a script:

ifdown wlan0

modprobe -r brcmfmac

- Bluetooth performs poorly

Then, I ran the following test:

- Start with brcmfmac modules loaded and associated to an AP, then run the following in a script:

wpa_cli disconnect

sleep 3

ifdown wlan0

modprobe -r brcmfmac

- Bluetooth functions normally.

Once I realized a 3 second delay after disconnect prevented the issue, I investigated to see how late in the module removal the delay could be placed before the issue began to occur again. I tried moving the delay into the kernel module itself and found that as long as the 3 second delay is put before the call to brcm_chip_set_passive() made in brcmf_sdio_remove(), then the issue is avoided. If I place it after that call, then I experience the poor Bluetooth performance. 

It seems like the module is left in a state where Bluetooth is in low priority.  Perhaps the module is still attempting to disassociate with the network when the chip is placed in passive mode? I am trying to understand what is happening so that I can avoid this issue properly, rather than inserting a long delay and hoping it is always sufficient. 

Any insight as to what is happening would be greatly appreciated. It is difficult to find information on the BT/Wi-Fi coexistence mechanism used by this chip. 

Thank you,

Hi Infineon Team,

We are using CYW43455 chip for WiFi in iMX8MM board working on Android 11 OS. We have completed the bringup for WiFi but it is not supporting WPA3 connections.

When we try to connect wifi with iphone hotspot, it doesnt connect. When we checked the logs, we found the following:

wpa_supplicant: wlan0: WPA: Failed to select authenticated key management type
wpa_supplicant: wlan0: WPA: Failed to set WPA key management and encryption suites

Does CYW43455 support WPA3 SAE? I couldnt find WPA3 support in the datasheet.

If it supports, could you please guide us in enabling the WPA3 profile in Android 11 OS for this IC?

Thanks,

Hrithik

Hi,

I want to port driver for CYW43455. I used this  Cypress Linux WiFi Driver Release (FMAC) [2020-06-25]  ,

Target platfrom is ST sta1275 DV12.5,

During the cross compilation of modules, I have seen the following warning.

root@sta1275-evb-mmc:~/aher_ko# insmod compat.ko
insmod: ERROR: could not insert module compat.ko: Unknown symbol in module

dmesg shows :
[ 59.569745] compat: Unknown symbol kmem_cache_alloc_trace (err 0)
[ 59.569905] compat: Unknown symbol __gnu_mcount_nc (err 0)

Could you help to fix this issue? Thanks a lot.

Is there any user manual or bring up sequence for murata 1XA bluetooth? I want use bluetooth on my specific evb but don't know how to enable it. etc. which driver? any patch? device tree? firmware?