[v3,0/3] rtw88: add support for BT co-existence mechanism

Message

Tony Chuang July 31, 2019, 12:22 p.m. UTC

From: Yan-Hsuan Chuang <[e-mail]>

This patch set mainly adds a BT co-existence mechanism, which
helps WiFi device to work with BT device concurrently without
interfering each other. For Realtek's WiFi/BT combo devices,
the co-existence mechanism is on the WiFi side.

The rest of the patches add BTcoex support. BTcoex needs to
wake up events that is waiting for some C2H reported in IRQ
context, so these C2H skbs do not required to be queued into
workqueues to be processed. What we need to do is to simply
wake it uin IRQ context.

And actually C2H workqueue context should be protected by
rtwdev->mutex lock to perform some hardware operations
against mac80211 callbacks.

The final patch contains the most of the BTcoex logic.
It is not that complicated, just to gather information and
make decision on WiFi driver side. What makes the code so
much is that the mechanism needs to take care of a lot of
WiFi/BT combinations. Such as if WiFi is at 2G or is having
a lot of traffic or is connecting to AP. And BT has many
profiles such as A2DP/HID/PAN or it is slave or not.


v1 -> v2

    rebase onto the latest wireless-drivers-next
    the conflicts is in pci.c with patch
    "rtw88: pci: Rearrange the memory usage for skb in RX ISR"

v2 -> v3

    - free skbs responded for coex information
    - remove BT efuse check related patches, because it is not
      recommended to read BT's efuse at WiFi side. If the efuse
      bank is switched at WiFi side, BT is not able to read its
      own efuse content
    - add TDMA mode with 4 slots, to deal with some BT earphones
      that have small buffer


Yan-Hsuan Chuang (3):
  rtw88: allow c2h operation in irq context
  rtw88: enclose c2h cmd handle with mutex
  rtw88: add BT co-existence support

 drivers/net/wireless/realtek/rtw88/Makefile   |    1 +
 drivers/net/wireless/realtek/rtw88/coex.c     | 2507 +++++++++++++++++++++++++
 drivers/net/wireless/realtek/rtw88/coex.h     |  369 ++++
 drivers/net/wireless/realtek/rtw88/fw.c       |  135 +-
 drivers/net/wireless/realtek/rtw88/fw.h       |   73 +
 drivers/net/wireless/realtek/rtw88/mac80211.c |   19 +
 drivers/net/wireless/realtek/rtw88/main.c     |   45 +-
 drivers/net/wireless/realtek/rtw88/main.h     |  233 +++
 drivers/net/wireless/realtek/rtw88/pci.c      |    6 +-
 drivers/net/wireless/realtek/rtw88/ps.c       |    9 +
 drivers/net/wireless/realtek/rtw88/reg.h      |   62 +
 drivers/net/wireless/realtek/rtw88/rtw8822b.c |  460 ++++-
 drivers/net/wireless/realtek/rtw88/rtw8822c.c |  355 +++-
 13 files changed, 4240 insertions(+), 34 deletions(-)
 create mode 100644 drivers/net/wireless/realtek/rtw88/coex.c
 create mode 100644 drivers/net/wireless/realtek/rtw88/coex.h