OK, just to be clear, where are those fields not used? They are used
in the new mmc_get_timeout() function.
I'm assuming SDIO should use the same logic as MMC for working out the
timeout value? Or is there an upper limit of 1 second on the timeout
for SDIO? I am not very confident in my understanding of the nuances
of SDIO. Also, I don't have any SDIO hardware so I can't test this
change (which is the reason I didn't change it in the first place).
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