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Paul GeurtsandGreg Kroah-Hartman
4f1c88644a
[ Upstream commita9bc28aa4e] The main channel Received Signal Strength Indicator (RSSI) measurement is used to determine whether an RF field is present or not. RSSI != 0 is interpreted as an RF Field is present. This does not take RF noise and measurement inaccuracy into account, and results in false positives in the field. Define a noise level and make sure the RF field is only interpreted as present when the RSSI is above the noise level. Fixes:851ee3cbf8("NFC: trf7970a: Don't turn on RF if there is already an RF field") Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Reviewed-by: Mark Greer <mgreer@animalcreek.com> Link: https://patch.msgid.link/20260422100930.581237-1-paul.geurts@prodrive-technologies.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>