Hello, On Sun, Oct 13, 2024 at 1:19 PM Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> wrote: > > Hello, > > I'm using an MT7921 PCIe card in AP mode on the 5GHz band. > It works well when I manually set a channel in hostapd.conf. > > Setting channel=0 or channel=acs_survey (both have the same meaning) > should make hostapd check for a suitable channel and pick that > automatically. > Unfortunately this does not work as hostapd reports the following (for > all frequencies/channels): > ACS: Survey for freq 5180 is missing noise floor > ACS: Survey for freq 5180 is missing noise floor > ACS: Survey for freq 5180 is missing noise floor > ACS: Survey for freq 5180 is missing noise floor > ACS: Survey for freq 5180 is missing noise floor > ACS: Channel 36 has insufficient survey data > > I suspect that this is due to mt792x_phy_update_channel() (from > drivers/net/wireless/mediatek/mt76/mt792x_mac.c) which calls > mt792x_phy_get_nf(). The latter just returns zero - so it seems > reading the noise floor from the hardware/firmware is not > supported yet. > > What is needed to implement this? I can test patches or - if > someone describes which registers to program - I can also write > a patch and submit it upstream. It's been a while so I'd like to ping the mt76 maintainers. Also I want to point out again that I can submit a patch if someone can provide me with the info on how to get the noise floor from the hardware/firmware. Best regards, Martin
