[ROC-RK3568-PC][Wifi] Bandwith limited to 20MHz

Chip Platform Rockchip
1

I have the following issue with the wifi module AP6275S: I am trying to run an access point in wifi ac mode but I when running iperf I saw the throughput is always around 125mbps. When running iw list I saw that in the capabilities only 20MHz bandwith is supported, which I think it may explain the issue:

iw list
Wiphy phy0
wiphy index: 0
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports roaming.
Device supports T-DLS.
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 1:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT RX MCS rate indexes supported: 0-7
HT TX MCS rate indexes are undefined
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)
Band 2:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT RX MCS rate indexes supported: 0-7
HT TX MCS rate indexes are undefined
VHT Capabilities (0x0f815832):
Max MPDU length: 11454
Supported Channel Width: neither 160 nor 80+80
RX LDPC
short GI (80 MHz)
SU Beamformer
SU Beamformee
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT RX highest supported: 0 Mbps
VHT TX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT TX highest supported: 0 Mbps
Frequencies:
* 5180 MHz [36] (0.0 dBm)
* 5200 MHz [40] (0.0 dBm)
* 5220 MHz [44] (0.0 dBm)
* 5240 MHz [48] (0.0 dBm)
* 5260 MHz [52] (0.0 dBm)
* 5280 MHz [56] (0.0 dBm)
* 5300 MHz [60] (0.0 dBm)
* 5320 MHz [64] (0.0 dBm)
* 5745 MHz [149] (0.0 dBm)
* 5765 MHz [153] (0.0 dBm)
* 5785 MHz [157] (0.0 dBm)
* 5805 MHz [161] (0.0 dBm)
* 5825 MHz [165] (0.0 dBm)
valid interface combinations:
* #{ AP } <= 2, #{ managed } <= 4, #{ P2P-client, P2P-GO } <= 2, #{ P2P-device } <= 1, #{
IBSS } <= 1,
total <= 5, #channels <= 2
Supported extended features:
* [ LOW_SPAN_SCAN ]: low span scan
* [ LOW_POWER_SCAN ]: low power scan
* [ HIGH_ACCURACY_SCAN ]: high accuracy scan

Is this expected? I would expect to see at least HT20/HT40. Of course I set hw_mode=1 in hostapd but had no success.

I saw the following kernel messages during boot:
[ 17.291957] [dhd] dhd_conf_set_path_params : Final fw_path=/vendor/etc/firmware/fw_bcm43752a2_ag.bin
[ 17.292008] [dhd] dhd_conf_set_path_params : Final clm_path=/vendor/etc/firmware/clm_bcm43752a2_ag.blob
[ 17.293991] dhd_os_open_image1: /vendor/etc/firmware/fw_bcm43752a2_ag.bin (743607 bytes) open success
[ 17.490209] dhd_os_open_image1: /vendor/etc/firmware/clm_bcm43752a2_ag.blob (28865 bytes) open success

Is the bandwith limited because of loading this firmware? Should I update my kernel to a one containing this patch https://patchwork.kernel.org/pro … [email]9-2-angus@akkea.ca[/email]/ to be able to increase wifi’s throughput?

Thanks in advance.

Valentin

2

Hello, did you use openwrt system? openwrt of 3568 supports HT20 and HT40, so it is not the issure to kernel.
so you can try to edit your hostapd.conf, set hw_mode to “g”. this is a hostapd.conf for openwrt for examples:

driver=nl80211
logger_syslog=127
logger_syslog_level=2
logger_stdout=127
logger_stdout_level=2
country_code=US
ieee80211d=1
hw_mode=g
supported_rates=60 90 120 180 240 360 480 540
basic_rates=60 120 240
beacon_int=100
dtim_period=2
channel=1
chanlist=1

ieee80211n=1
ht_coex=0

radio_config_id=570b89ac214840092cda49c8238746df
interface=wlan0
ctrl_interface=/var/run/hostapd
ap_isolate=1
disassoc_low_ack=0
skip_inactivity_poll=0
preamble=1
wmm_enabled=1
ignore_broadcast_ssid=0
uapsd_advertisement_enabled=1
utf8_ssid=1
multi_ap=0
auth_algs=1
wpa=0
ssid=OpenWRT-95D4
bridge=br-lan
wds_bridge=
snoop_iface=br-lan
config_id=fa5f1619a6f9b1243fc2d154a4127dc4
bssid=00:00:00:00:00:00
3

Hi Javier,

I also tried openwrt image (Station_P2_OpenWRT_GPT_20211123_1812.img), however ‘iw list’ still only shows HT20 in capabilities. I am not trying to do wifi g but wifi ac, which is supposed to be supported.

Also patched 4.19 kernel to use dhd driver in wifi5 instead of wifi6 but capabilities are the same, I guess the issue comes from fw_bcm43752a2_ag.bin but no one has confirmed it yet.

4

you can try the newest firmware,which date is 20220222
OR you can fix the bug manually，delete this freq-limit in rk3568-firefly-roc-pc.dtsi :

 &sdmmc2 {
     status = "okay";
-    max-frequency = <100000000>;
 };

this may help

5

I’ve just flashed ROC-RK3568-PC-UBUNTU18.04-GPT-20220222-1540.img:
root@firefly:~# uname -a
Linux firefly 4.19.219 #370 SMP Tue Feb 22 15:35:10 CST 2022 aarch64 aarch64 aarch64 GNU/Linux

However I still see the same output of iw list:

Band 1:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
…
…
…
Band 2:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40

I would expect at least HT20/HT40

6

firmware.zip (869 KB)
try this new wifi firmware, put them under /vendor/etc/firmware/
and reboot the device

7

Thanks, it is better, around ~240mbps, however I’m still limited because of supported bandwidth. I cannot setup HT40+ in hostapd.conf because the capability is not supported

8

please use wl to show wifi status

root@FusionWrt:~# ./wl status
SSID: "OpenWRT-A046"
Mode: Managed   RSSI: 0 dBm     SNR: 0 dB       noise: -95 dBm  Channel: 36/80
BSSID: 10:2C:6B:7F:A0:46        Capability: ESS
Supported Rates: [ 6(b) 9 12(b) 18 24(b) 36 48 54 ]
VHT Capable:
        Chanspec: 5GHz channel 42 80MHz (0xe02a)
        Primary channel: 36
        HT Capabilities:
        Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]
        VHT Capabilities:
        Supported VHT (tx) Rates:
                NSS: 1 MCS: 0-9
                NSS: 2 MCS: 0-9
        Supported VHT (rx) Rates:
                NSS: 1 MCS: 0-9
                NSS: 2 MCS: 0-9

wl.zip (268 KB)

9

Javier Posted at 3/7/2022 14:33
please use wl to show wifi status

root@FusionWrt:~# ./wl status

It worked for me. Thanks.

happy wheels

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