[PATCH 0/3][SRU][U/OEM-5.10] support RTL8821CE RFE Type 2

[You-Sheng Yang]

BugLink: https://bugs.launchpad.net/bugs/1885862

[Impact]

RTL8821CE RFE Type 2 PCIE module is not supported by new rtw88 driver
in kernel version v5.11 or older. Dmesg gives:

  rtw_8821ce 0000:01:00.0: enabling device (0000 -> 0003)
  rtw_8821ce 0000:01:00.0: Firmware version 24.8.0, H2C version 12
  rtw_8821ce 0000:01:00.0: rfe 2 isn't supported
  rtw_8821ce 0000:01:00.0: failed to setup chip efuse info
  rtw_8821ce 0000:01:00.0: failed to setup chip information

Such modules are previosly covered by rtl8821ce-dkms.

[Fix]

Patch set
https://lore.kernel.org/linux-wireless/20210202055012.8296-1-pkshih@realtek.com/
landed in v5.12-rc1, as well as WLAN firmware updates in commit
c5e3240eff0f ("rtw88: RTL8821C: Update firmware to v24.8"), which is
already available in Hirsute version 1.195. Bluetooth firmware should
have been the latest 0x829a_7644 in both Focal/Hirsute.

[Test Case]

With patched kernel, wlan interface should be up and running:

  rtw_8821ce 0000:01:00.0: enabling device (0000 -> 0003)
  rtw_8821ce 0000:01:00.0: Firmware version 24.8.0, H2C version 12
  rtw_8821ce 0000:01:00.0 wlp1s0: renamed from wlan0

[Where problems could occur]

Previously this hardware piece can only be driven by external DKMS
modules, so with this driver patched, users can now use in-tree driver,
but may experience the difference between them in power consumption or
feature supportness.

[Other Info]

While Bionic/Focal LTS is still using rtl8821ce-dkms for RFE Type 2
cards, there is no plan to introduce such change to them. So they'll be
upgraded only at the next point release with kernel >= 5.11.

Guo-Feng Fan (3):
  rtw88: coex: 8821c: correct antenna switch function
  rtw88: 8821c: Correct CCK RSSI
  rtw88: 8821c: support RFE type2 wifi NIC

 drivers/net/wireless/realtek/rtw88/main.c     |   2 +
 drivers/net/wireless/realtek/rtw88/main.h     |   7 +
 drivers/net/wireless/realtek/rtw88/rtw8821c.c | 109 ++++-
 drivers/net/wireless/realtek/rtw88/rtw8821c.h |  22 +
 .../wireless/realtek/rtw88/rtw8821c_table.c   | 397 ++++++++++++++++++
 .../wireless/realtek/rtw88/rtw8821c_table.h   |   1 +
 6 files changed, 525 insertions(+), 13 deletions(-)

-- 
2.30.0