[SRU][K][PATCH 0/4] Mediatek WLAN RZ616(MT7922) SAR table control

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1997200

[Impact]
In order to make sure the amount of RF energy being absorbed by our
bodies is safe according to the FCC’s guidelines, products must undergo
and pass SAR testing.

[Fix]
Add ACPI SAR table control to pass the testing.

[Test]
the unit is 0.5dBm in following:

Without the SAR table control:
$ sudo cat /sys/kernel/debug/ieee80211/phy0/mt76/txpower_sku | grep -i
user
CCK (user) : N.A N.A N.A N.A
OFDM (user) : 40 40 40 40 40 40 40 40
HT20 (user) : 40 40 40 40 40 40 40 40
HT40 (user) : 40 40 40 40 40 40 40 40 40
VHT20 (user) : 40 40 40 40 40 40 40 40 40 40 0 0
VHT40 (user) : 40 40 40 40 40 40 40 40 40 40 0 0
VHT80 (user) : 40 40 40 40 40 40 40 40 40 40 0 0
VHT160 (user) : 40 40 40 40 40 40 40 40 40 40 0 0
HE26 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE52 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE106 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE242 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE484 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE996 (user) : 40 40 40 40 40 40 40 40 40 40 40 40
HE996x2 (user) : 40 40 40 40 40 40 40 40 40 40 40 40

After enabled SAR table control:
$ sudo cat /sys/kernel/debug/ieee80211/phy0/mt76/txpower_sku | grep -i
user
CCK (user) : N.A N.A N.A N.A
OFDM (user) : 26 26 26 26 26 26 26 26
HT20 (user) : 26 26 26 26 26 26 26 26
HT40 (user) : 26 26 26 26 26 26 26 26 26
VHT20 (user) : 26 26 26 26 26 26 26 26 26 26 0 0
VHT40 (user) : 26 26 26 26 26 26 26 26 26 26 0 0
VHT80 (user) : 26 26 26 26 26 26 26 26 26 26 0 0
VHT160 (user) : 26 26 26 26 26 26 26 26 26 26 0 0
HE26 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE52 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE106 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE242 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE484 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE996 (user) : 26 26 26 26 26 26 26 26 26 26 26 26
HE996x2 (user) : 26 26 26 26 26 26 26 26 26 26 26 26

Also done stress test with iperf, all works fine.

[Where problems could occur]
It may break mt7922 driver.

These commits are already in oem-6.0 and unstable.

Dan Carpenter (1):
  wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()

Deren Wu (3):
  mt76: add 6 GHz band support in mt76_sar_freq_ranges
  mt76: mt7921: introduce ACPI SAR support
  mt76: mt7921: introduce ACPI SAR config in tx power

 drivers/net/wireless/mediatek/mt76/mac80211.c |   6 +
 .../wireless/mediatek/mt76/mt7921/Makefile    |   1 +
 .../wireless/mediatek/mt76/mt7921/acpi_sar.c  | 282 ++++++++++++++++++
 .../wireless/mediatek/mt76/mt7921/acpi_sar.h  |  93 ++++++
 .../net/wireless/mediatek/mt76/mt7921/init.c  |   5 +-
 .../net/wireless/mediatek/mt76/mt7921/main.c  |  31 +-
 .../wireless/mediatek/mt76/mt7921/mt7921.h    |  22 ++
 7 files changed, 429 insertions(+), 11 deletions(-)
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h

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2.34.1