Re: [PATCH] mmc: core: Remove timeout when enabling cache

[Wolfram Sang]

> That also happens to be one of the cards we deploy; However i did
> wonder about adding a quirk but decided against it as it was not clear
> to me from the specification that CACHE ON really is meant to complete
> within GENERIC_CMD6_TIMEOUT. That and i fret about ending up in hit-a-
> mole games as the failure is really quite tedious (boot failure). 

I agree that we should use the more defensive variant as a default. I
mean there should be no performance regression since most cards will
respond just faster, or? The only downside I could see is that we might
miss a real timeout with no bounds set and might get stuck? Maybe it is
worth contacting eMMC spec people to at least know what is the expected
behaviour?

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