[PATCH] mmc: use usleep_range() in mmc_delay()
aaro.koskinen at nokia.com
Fri Jan 13 14:52:16 UTC 2012
On Fri, 13 Jan 2012, Dmitry Antipov wrote:
> On 01/13/2012 05:22 PM, Aaro Koskinen wrote:
>> Anyway, I think the change is good. On systems with multiple MMC devices
>> the boot/probe can spend 100-200 ms alone just doing busylooping delays. I
>> think e.g. in mmc_rescan() the code uses frequently mmc_delay(10).
> I'm worrying about this:
> mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000))
> since I have no ideas about typical values for this timeout.
> If it may be too small (<=10 us), using usleep_range() makes no sense.
Hmm, but the code above is rounding it up to at least 1 ms?
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