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From:   youling 257 <youling257@gmail.com>
Date:   Sun, 22 Mar 2020 20:20:51 +0800
Message-ID: <CAOzgRdZ9jzhg5a5T89WVWFan=KOfxuff7qxnX9mXXv5cc-nznQ@mail.gmail.com>
Subject: brcmfmac43430a0-sdio wifi speed only 30Mbps under 40Mhz
To:     Arend van Spriel <arend.vanspriel@broadcom.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
        Wright Feng <wright.feng@cypress.com>,
        linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com, brcm80211-dev-list@cypress.com
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my Cherry trail ezpad 6 tablet has a brcmfmac43430a0-sdio wifi, wifi
speed only 30Mbps under 40mhz.
my Bay trail tablet has a rtl8723bs sdio wifi, wifi speed can 70Mbps
under 40mhz.

so i can guess the brcmfmac43430a0-sdio wifi not support 40mhz?