Hi, On Sun, Nov 25 2012, Daniel Drake wrote: > The OLPC XO-1.75 laptop includes a SDHCI controller which is 1.8v > capable, and it truthfully reports so in its capabilities. This > alternate voltage is used for driving new "UHS-I" SD cards at their > full speed. > > However, what the controller doesn't know is that the motherboard > physically doesn't have a 1.8v supply available. > > Add a quirk so that systems such as this one can override disable > 1.8v support, adding support for UHS-I cards (by running them at > 3.3v). > > This avoids a problem where the system would first try to run the > card at 1.8v, fail, and then not be able to fully reset the card > to retry at the normal 3.3v voltage. > > This is more appropriate than using the MISSING_CAPS quirk, which > is intended for cases where the SDHCI controller is actually lying > about its capabilities, and would force us to somehow override both > caps words from another source. > > Signed-off-by: Daniel Drake <dsd@xxxxxxxxxx> Thanks, pushed to mmc-next for 3.8. - Chris. -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> One Laptop Per Child -- 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
