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When the device is disabled, the internal circuitry keeps the data register loaded and doesn't update it. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20190104182057.8778-1-philmd@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>