mmc: atmel-mci: correct data timeout computation
The HSMCI operates at a rate of up to Master Clock divided by two. Moreover previous calculation can cause overflows and so wrong timeouts. Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com> Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com> Cc: <stable@vger.kernel.org> Signed-off-by: NChris Ball <cjb@laptop.org>
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