spi: pl022: add a message state STATE_TIMEOUT for timeout transfer
When transfer timeout, give -EAGAIN to the message's status, and it can make the spi device driver choose repeated transimation or not. And if transfer timeout, output some useful information for tracing the issue. Signed-off-by: Jiwei Sun <jiwei.sun@windriver.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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