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Preserve unaffected bits state when accessing EFR register. This prevents hardware flow control bits from being cleared on enhanced functions access. Signed-off-by: Lech Perczak <l.perczak@camlintechnologies.com> Signed-off-by: Tomasz Moń <tomasz.mon@camlingroup.com> Link: https://lore.kernel.org/r/20220221105618.3503470-2-tomasz.mon@camlingroup.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>