Hi Ohad, On 17 June 2011 15:31, Ohad Ben-Cohen <ohad@xxxxxxxxxx> wrote: >> Yes, a regulator could work. But, aren't regulators linked to the >> platform rather than to the card? I would imagine that this quirk >> needs to be applied to all users of the card, therefore a card quirk >> could be more appropriate? Also, if you think the sdio_reset() option >> is preferable to the sleep, can that be done from a regulator? > > I'd really prefer to understand what's wrong first. > > If we have a rigid hardware requirement that demands waiting before > powering it up again, then we better obey it. But I somehow doubt that > a 250ms delay is required. That's way too much... So, as I found here: http://article.gmane.org/gmane.linux.kernel.mmc/8605 This is an OLPC-specific issue due to lack of power clamping on the motherboard's power supply, which might not be shared by other sd8686 users, and a long delay is expected. I have been testing further and I have seen a couple of times that msleep(300) is not enough, or at least the card failed to do the cmd5 reset in those cases. The sdio_reset() method seems to be 100% reliable however, I haven't seen a single failure with that yet. Where do we go from here? Any suggested implementation approach? Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
