Philipp Borgers [off-list ref] wrote:

The rx descriptor contains a STBC indicator. If the indicator is set the
frame was received with STBC.

Signed-off-by: Philipp Borgers <redacted>
Signed-off-by: Kalle Valo <redacted>

Patch applied to ath-next branch of ath.git, thanks.

238ebd8b487b ath9k: ar9003_mac: read STBC indicator from rx descriptor

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210517172426.15919-1-borgers@mi.fu-berlin.de/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches