mmc: sdhci: add platform get_max_timeout_count hook
Currently the max timeout count is hardcode to 1 << 27 for calcuate the max_busy_timeout, however, for some platforms the max timeout count may not be 1 << 27, e.g. i.MX uSDHC is 1 << 28. Thus 1 << 27 is not correct for such platform. It is also possible that other platforms may have different values. To be flexible, we add a get_max_timeout_count hook to get the correct maximum timeout value for these platforms. Reviewed-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Dong Aisheng <b29396@freescale.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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