• Yan-Hsuan Chuang's avatar
    rtw88: add BT co-existence support · 4136214f
    Yan-Hsuan Chuang authored
    Both RTL8822BE/RTL8822CE are WiFi + BT combo chips. Since
    WiFi and BT use 2.4GHz to transmit, it is important to
    make sure they run concurrently without interfering each
    other. To achieve this, WiFi driver requires a mechanism
    to collaborate with BT, whether they share the antenna(s)
    or not.
    
    The final decision made by the co-existence mechanism is
    to choose a proper strategy, or called "tdma/table", and
    inform either firmware or hardware of the strategy.
    To choose a strategy, co-existence mechanism needs to
    have enough information from WiFi and BT.
    
    BT information is provided through firmware C2H.
    The contents describe the current status of BT, such as
    if BT is connected or is idle, or the profile that is
    being used.
    
    WiFi information can be provided by WiFi itself. The WiFi
    driver will call various of "notify" functions each time
    the state of WiFi changed, such as WiFi is going to switch
    channel or is connected. Also WiFi driver can know if it
    shares antenna with BT by reading efuse content. Antenna
    configuration of the module will finally get a different
    strategy.
    
    Upon receiving any information from WiFi or BT, the WiFi
    driver will run the co-existence mechanism immediately.
    It will set the RF antenna configuration according to the
    strategy through the TDMA H2C to firmware and a hardware
    table. Based on the tdma/table, WiFi + BT should work with
    each other, and having a better user experience.
    Signed-off-by: default avatarYan-Hsuan Chuang <yhchuang@realtek.com>
    Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
    4136214f
rtw8822c.c 79 KB