[SRU][N][PATCH 0/1] rtw89: Support hardware rfkill

[En-Wei Wu]

BugLink: https://bugs.launchpad.net/bugs/2077384

[Impact]
With RTL8852BE and "Control WLAN radio" (in Dell BIOS setting) on, wifi
function is not be disabled when we plug in the Ethernet cable. The
issue is because the rtw89 driver doesn't have the hardware rfkill
mechanism.

[Fix]
Backport the Realtek patch in linux-next:

0b38e6277aed wifi: rtw89: add support for hardware rfkill

This patch also adds the rfkill functionalities to RTL8852BT, which is
currently
not supported by Ubuntu kernels. So we omit the modification on
drivers/net/wireless/realtek/rtw89/rtw8852bt.c.

[Test Plan]
1. Enable Control WLAN radio in BIOS setting
2. Boot into OS
2. Plug in Ethernet cable
3. Run `rfkill list` and see if the `phy0` is hard blocked (hard
   blocked: yes on success)

[Where problems could occur]
This patch adds the functionality of hardware rfkill by continuously
polling the register of GPIO pin status and determines whether to
block the device based on the value read. If the register read is
somehow buggy, it may cause that the device is blocked unexpectedly.

Kuan-Chung Chen (1):
  wifi: rtw89: add support for hardware rfkill

 drivers/net/wireless/realtek/rtw89/core.c     | 68 +++++++++++++++++++
 drivers/net/wireless/realtek/rtw89/core.h     |  9 +++
 drivers/net/wireless/realtek/rtw89/mac80211.c | 17 +++++
 drivers/net/wireless/realtek/rtw89/reg.h      | 24 +++++++
 drivers/net/wireless/realtek/rtw89/rtw8851b.c | 11 +++
 drivers/net/wireless/realtek/rtw89/rtw8852a.c | 11 +++
 drivers/net/wireless/realtek/rtw89/rtw8852b.c | 11 +++
 drivers/net/wireless/realtek/rtw89/rtw8852c.c | 11 +++
 drivers/net/wireless/realtek/rtw89/rtw8922a.c | 11 +++
 9 files changed, 173 insertions(+)

-- 
2.43.0